6568( 3) - 02/16/96 11:01 - [ 1] PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS ST ScI Use Only ID: 6568 Version: 3 Check-in Date: 16-Feb-1996 09:59:53 1.Proposal Title: OUTBURSTS IN BLACK HOLE X-RAY TRANSIENTS ------------------------------------------------------------------------------------ 2. Scientific Category 3. Proposal For 4. Cycle BINARIES AND STAR FOR GO 6 ------------------------------------------------------------------------------------ 5. Investigators Contact? PI: Carole Haswell Columbia University CoI: Mario Livio Space Telescope Science Institute N CoI: Mark Wagner Ohio State University (Lowell) N CoI: Keith Horne University of St. Andrews N CoI: Chris Shrader NASA Goddard Space Flight Center N CoI: Wan Chen NASA Goddard Space Flight Center N CoI: Fuhua Cheng University of Maryland N ------------------------------------------------------------------------------------ 6. Abstract UV observations of soft X-ray transients (SXTs) will be made using the FOS. This is part of an extensive multiwavelength target of opportunity campaign to monitor newly discovered SXTs in outburst and throughout the subsequent decline. Recent work establishes that a high proportion of SXTs harbor black holes, so these observations provide an unrivalled opportunity to obtain high quality data from an accreting black hole. UV data is a keystone of our multiwavelength campaign because the disk regions of interest radiate predominantly in the UV. Emission lines will allow us to probe the kinematics of the inner disk region. We will determine the relative strengths of the reprocessed X-ray flux emitted in the UV, and the UV flux generated by viscous heating in the accretion flow. Multiwavelength observations will probe the physics of the accretion flow throughout the outburst. The observations will yield a detailed quantitative test of the thermal disk instability model for SXT outbursts. FOS work on Nova Muscae 1991 demonstrated the critical importance to this test of recording the UV and optical spectrum during the decline. The unique FOS/G160L capability for simultaneous 1100 -2500A spectra and optical photometry with 2s time resolution will be exploited: an HST / XTE coordinated echo-mapping experiment will measure the size of the reprocessing regions in the accretion disk, and thus probe morphology changes as the decline proceeds. ------------------------------------------------------------------------------------ 6568( 3) - 02/16/96 11:01 - [ 2] Observations Description ------------------------ We plan a total of 8 visits to the target throughout the decline from outburst. Since we do not yet know the coordinates of the target, we assume the average visibility window of 56 minutes, and use the standard ACQ/PEAK acquisition. (ACQ/BINARY is not suitable for such a variable target.) To calculate exposure times we assume a typical SXT lightcurve and E(B-V)=0.3, and demand at least 100 counts Angstrom ^-1 at the center of the spectrum, with a minimum 5 minutes exposure time for the high resolution gratings. The G160L exposures were fixed at 20m to give the longest possible 2s resolution data stream. Extra minutes were added or subtracted as necessary to pack the orbits; these adjustments will vary with the visibility window. On the first five visits, while the SXT is bright, the following high resolution modes: Blue/G130H, Blue/G190H, Red/G270H, Red/G400H, will obtain spectral coverage from 1100A to 4800A. We will operate in RAPID mode, with READ-TIME=6.18s. This allows us to monitor short timescale variability. Additionally, we will use FOS/BLUE/G160L to record simultaneous white light photometry (with order 0) and low spectral resolution UV spectroscopy (with order 1) at the maximum possible time resolution. This G160L capability is unique, and will be lost after cycle 6. On the last three visits we drop the long G130H exposure and plan instead for a well-exposed G160L spectrum to cover the 1150 - 1600Angstrom region. The following table summarises our program: beginverbatim FOS t V blue blue red red blue orbits visit (days) mag G130H G190H G270H G400H G160L 1 0 13 5m 5m 26m 9m 20m 3 2 10 13.27 5m 5m 26m 9m 20m 3 3 20 13.54 5m 5m 26m 9m 20m 3 4 30 13.18 5m 5m 26m 9m 20m 3 5 60 14.63 8m 5m 26m 9m 17m 3 6 90 15.44 15m 26m 9m 20m 3 7 120 16.25 15m 26m 9m 20m 3 8 150 17.08 22m 26m 9m 64m 4 endverbatim The ``reuse target offset'' capability may improve the efficiency of some of our target acquisitions (Tony Keyes, 9:14:95), but is not guaranteed and would save only sim1 / 2 orbits, so we budget here for ACQ/PEAK. Therefore we would prefer any cuts to our program be specified in terms of orbits rather than visits. Our simultaneous XTE program is already approved with the above (same as cycle 5) visit schedule. We emphasise that in the case that the efficiency does improve, we would still be able to make excellent use of the full request: the signal - to-noise ratio of our data and duration of coverage would be enhanced, hence allowing us to better pursue our goals. Real Time Justification ----------------------- The recurrence times of an individual sources vary greatly, and are unpredictable, hence we require Target of Opportunity Observations. There is a significant likelihood of a major transient event occurring during the duration of this proposal. Over the last 7 years four major events occurred, though the last one was GRO J0422, in cycle 3 (1993). This proposal was approved with High Priority for Cycles 4 and 5. In cycle 4 we did not trigger our program: we deemed the best target, GRO J1655-40, too highly reddened to be suitable for our expensive HST UV spectroscopy program. Prompt observations, within a week of discovery if possible, are desirable. If we miss the first weeks of the decay, we may fail to unequivocally test the disk instability model. As the source fades, data quality will decline; early observations hold the most potential for ground-breaking discoveries. We have in place XTE and GRO target of opportunity programs to observe SXTs. XTE and GRO will provide early detection, and subsequently monitor the X-ray intensity. Hence, ``real time'' planning of observations at other wavelengths is facilitated. At Lowell observatory we have immediate access to high quality ground-based observations. We will trigger the HST program if a major SXT, reaching ~ 1 Crab and/or V ~ 14, occurs. XTE will make observations simultaneously with HST for echo- mapping. The burden of coordinating schedules will fall upon XTE, which is far more flexible than HST. HST is needed for several reasons. By using the RAPID mode of the FOS, we will obtain higher time resolution than is possible with IUE (which will probably no longer be operational in Cycle 6), so we can monitor the expected rapid variations in emission from an accreting black hole. The echo -mapping observations we propose depend on this HST/FOS capability, as well as the unique ability to obtain simultaneous UV spectra and optical photometry with G160L. The IUE instruments have limited dynamic range and our observations require HST's superior sensitivity and resolution. Calibration Justification ------------------------- Additional Comments ------------------- ------------------------------------------------------------------------------------ 6568( 3) - 02/16/96 11:01 - [ 3] Data Distribution Media: 8MM Blocking Factor: 10 Ship To: PI_Address*Box 46, Pupin Hall,*538 W. 120th St, New York,*NY 10027 Ship Via: UPS OVERNIGHT Email: , ------------------------------------------------------------------------------------ 6568( 3) - 02/16/96 11:01 - [ 4] TARGET LIST c)Generic Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Selection Criteria | Flux data No | Name | Description | | ------------------------------------------------------------------------------------------------------------------------------------ X-RAY- STAR, Interacting RA=12H +/- 12H,DEC=0D +/- 90D V = 13.0 TRANSIENT Binary, X-ray Novae, X- ray Transient, LMXB Comments: N <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< ew SXT will be followed thru decline. Until outburst, flux, E(B-V), etc unknown. Optical/IUE data -> planning. Assume Fnu=nu**1/3 spectrum V=13+(TIME/36.8days), E(B- V)=0.3 for calcs. ARBITRARY CUT TO 22 ORBITS FOR 16-Feb- 1996 DEADLINE. WILL RESUBMIT OPTIMISED PROGRAM LATER. ------------------------------------------------------------------------------------------------------------------------------------ 6568( 3) - 02/16/96 11:01 - [ 5] Visit: 01 Visit Requirements: BETWEEN 01-JUL-96 AND 06-JUL-96 ON HOLD ORIENT 30D TO 29D FROM NOMINAL On Hold Comments: This is a target of opportunity. Coordinates, fluxes, and timing information are unknown until newly outbursting SXT triggers the program. Additional Comments: Orientation 30 degrees from nominal to enable reuse of these guide stars in subsequent visits. Need to check sign of the orientation offset from nominal after the target coordinates and date of the visit are known. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 X-RAY- FOS/BL ACQ/PEA 4.3 MIRROR SCAN-STEP- 1 0.54S ONBOARD ACQ FOR 2 NO SPLIT TRANSIENT K X=1.204,SEARCH- SIZE-X=3,SEARCH -SIZE-Y=1 Comments: 1st stage acq/peak. Exposure time for FOS/RD 0.26S. Order of FOS sides unimportant, but FOS/BL ACQ gives lower countrates, safer. Exposure Times for 10,000 counts. ------------------------------------------------------------------------------------------------------------------------------------ 2 X-RAY- FOS/BL ACQ/PEA 1.0 MIRROR SCAN-STEP- 1 0.56S ONBOARD ACQ FOR 3 NO SPLIT TRANSIENT K X=0.602,SCAN- STEP- Y=0.602,SEARCH- SIZE-X=2,SEARCH Comments: 2nd stage acq/peak. Exposure time for FOS/RD -SIZE-Y=6 0.27S. WE ARE CLOSE TO BRIGHTNESS LIMITS. Check countrate for actual target carefully ------------------------------------------------------------------------------------------------------------------------------------ 3 X-RAY- FOS/BL ACQ/PEA 0.5 MIRROR SCAN-STEP- 1 0.60S ONBOARD ACQ FOR 4 NO SPLIT TRANSIENT K X=0.207,SCAN- STEP- Y=0.207,SEARCH- SIZE-X=4,SEARCH Comments: 3rd stage acq/peak. Exposure time for FOS/RD -SIZE-Y=4 0.29S. Optimise this pattern to make best use of the remaining target visibility. i.e. might be able to do 5x5 in 0.3 if target has long enough visibility. ------------------------------------------------------------------------------------------------------------------------------------ 4 X-RAY- FOS/BL RAPID 1.0 G130H READ-TIME=6.18 1 976.44S EXPAND NO SPLIT TRANSIENT Comments: No Split just to force target acquisition orbit to remain free of grating change overhead, for planning purposes. ------------------------------------------------------------------------------------------------------------------------------------ 5 X-RAY- FOS/BL RAPID 1.0 G190H READ-TIME=6.18 1 599.46S TRANSIENT ------------------------------------------------------------------------------------------------------------------------------------ 6 X-RAY- FOS/BL RAPID 1.0 PRISM READ-TIME=6.18 1 364.62S NO SPLIT TRANSIENT ------------------------------------------------------------------------------------------------------------------------------------ 7 X-RAY- FOS/BL RAPID 1.0 G130H READ-TIME=6.18 1 1223.64 TRANSIENT ------------------------------------------------------------------------------------------------------------------------------------ 6568( 3) - 02/16/96 11:01 - [ 6] Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 8 X-RAY- FOS/BL RAPID 1.0 G160L READ-TIME=2.0 1 18M MAX DUR 18M NO SPLIT TRANSIENT Comments: Check Wavelength range for restricted readout. This exposure is for the echo- mapping experiment. Need the high telemetry rate, and onboard tape recorder. Only space for 18M of data on the tape recorder ( CAL/FOS 124) ------------------------------------------------------------------------------------------------------------------------------------ 9 X-RAY- FOS/BL RAPID 1.0 G130H READ-TIME=6.18 1 1860.18 TRANSIENT ------------------------------------------------------------------------------------------------------------------------------------ 10 X-RAY- FOS/BL RAPID 1.0 PRISM READ-TIME=6.18 1 401.7S NO SPLIT TRANSIENT ------------------------------------------------------------------------------------------------------------------------------------ 11 X-RAY- FOS/BL RAPID 1.0 G130H READ-TIME=6.18 1 1798.38 TRANSIENT ------------------------------------------------------------------------------------------------------------------------------------ 12 X-RAY- FOS/BL RAPID 1.0 G190H READ-TIME=6.18 1 358.44S NO SPLIT TRANSIENT Comments: side change after BLUE G190H ------------------------------------------------------------------------------------------------------------------------------------ 13 X-RAY- FOS/RD RAPID 1.0 G270H READ-TIME=6.18 1 871.38S TRANSIENT Comments: Detailed observing plan is likely to change when actual target is ID'd. These exposures are guidelines only. ------------------------------------------------------------------------------------------------------------------------------------ 14 X-RAY- FOS/RD RAPID 1.0 G400H READ-TIME=6.18 1 741.6S TRANSIENT ------------------------------------------------------------------------------------------------------------------------------------ 15 X-RAY- FOS/RD RAPID 1.0 PRISM READ-TIME=6.18 1 426.42S TRANSIENT ------------------------------------------------------------------------------------------------------------------------------------ 6568( 3) - 02/16/96 11:01 - [ 7] Visit: 02 Visit Requirements: AFTER 1 BY 9D to 11D ON HOLD SAME ORIENT AS 1 On Hold Comments: This is a target of opportunity. Coordinates, fluxes, and timing information are unknown until newly outbursting SXT triggers the program. Additional Comments: Reuse same guide stars as Visit 1. Check posn with 4x4 ACQ/PEAK. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 3 X-RAY- FOS/RD ACQ/PEA 0.5 MIRROR SCAN-STEP- 1 0.37S ONBOARD ACQ FOR 4 NO SPLIT TRANSIENT K X=0.207,SCAN- STEP- Y=0.207,SEARCH- SIZE-X=4,SEARCH Comments: acq/peak to check position after reacquiring -SIZE-Y=4 Visit 1's guide stars. FOS/BL exp time 0.78s. Exposures calculated for 10,000 counts. ------------------------------------------------------------------------------------------------------------------------------------ 4 X-RAY- FOS/RD RAPID 1.0 G270H READ-TIME=6.18 1 642.72S TRANSIENT Comments: Detailed observing plan is likely to change when actual target is ID'd. These exposures are guidelines only. ------------------------------------------------------------------------------------------------------------------------------------ 5 X-RAY- FOS/RD RAPID 1.0 G400H READ-TIME=6.18 1 401.7S TRANSIENT Comments: Side change after this exposure. Should take place during occultation. ------------------------------------------------------------------------------------------------------------------------------------ 6 X-RAY- FOS/BL RAPID 1.0 G130H READ-TIME=6.18 1 401.7S TRANSIENT Comments: G130H is where the most interesting lines are. Expand this exposure preferentially. ------------------------------------------------------------------------------------------------------------------------------------ 7 X-RAY- FOS/BL RAPID 1.0 G190H READ-TIME=6.18 1 401.7S TRANSIENT ------------------------------------------------------------------------------------------------------------------------------------ 8 X-RAY- FOS/BL RAPID 1.0 G160L READ-TIME=2.0 1 18M MAX DUR 18M NO SPLIT TRANSIENT Comments: Check Wavelength range for restricted readout. This exposure is for the echo- mapping experiment. Need the high telemetry rate, and onboard tape recorder. Only space for 18M of data on the tape recorder ( CAL/FOS 124) ------------------------------------------------------------------------------------------------------------------------------------ 9 X-RAY- FOS/BL RAPID 1.0 G130H READ-TIME=6.18 1 1860.18 TRANSIENT ------------------------------------------------------------------------------------------------------------------------------------ 10 X-RAY- FOS/BL RAPID 1.0 PRISM READ-TIME=6.18 1 358.44S NO SPLIT TRANSIENT ------------------------------------------------------------------------------------------------------------------------------------ 6568( 3) - 02/16/96 11:01 - [ 8] Visit: 03 Visit Requirements: AFTER 1 BY 19D to 21D ON HOLD SAME ORIENT AS 1 On Hold Comments: This is a target of opportunity. Coordinates, fluxes, and timing information are unknown until newly outbursting SXT triggers the program. Additional Comments: Reuse same guide stars as Visit 1. Check posn with 4x4 ACQ/PEAK. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 3 X-RAY- FOS/RD ACQ/PEA 0.5 MIRROR SCAN-STEP- 1 0.47S ONBOARD ACQ FOR 4 NO SPLIT TRANSIENT K X=0.207,SCAN- STEP- Y=0.207,SEARCH- SIZE-X=4,SEARCH Comments: acq/peak to check position after reacquiring -SIZE-Y=4 Visit 1's guide stars. FOS/BL 1.00s. Exposures calculated for 10,000 counts. ------------------------------------------------------------------------------------------------------------------------------------ 4 X-RAY- FOS/RD RAPID 1.0 G270H READ-TIME=6.18 1 642.72S TRANSIENT Comments: Detailed observing plan is likely to change when actual target is ID'd. These exposures are guidelines only. ------------------------------------------------------------------------------------------------------------------------------------ 5 X-RAY- FOS/RD RAPID 1.0 G400H READ-TIME=6.18 1 401.7S TRANSIENT ------------------------------------------------------------------------------------------------------------------------------------ 6 X-RAY- FOS/BL RAPID 1.0 G130H READ-TIME=6.18 1 401.7S TRANSIENT Comments: G130H is where the most interesting lines are. Expand this exposure preferentially. ------------------------------------------------------------------------------------------------------------------------------------ 7 X-RAY- FOS/BL RAPID 1.0 G190H READ-TIME=6.18 1 401.7S TRANSIENT ------------------------------------------------------------------------------------------------------------------------------------ 8 X-RAY- FOS/BL RAPID 1.0 G160L READ-TIME=2.0 1 18M MAX DUR 18M NO SPLIT TRANSIENT Comments: Check Wavelength range for restricted readout. This exposure is for the echo- mapping experiment. Need the high telemetry rate, and onboard tape recorder. Only space for 18M of data on the tape recorder ( CAL/FOS 124) ------------------------------------------------------------------------------------------------------------------------------------ 9 X-RAY- FOS/BL RAPID 1.0 G130H READ-TIME=6.18 1 1860.18 TRANSIENT ------------------------------------------------------------------------------------------------------------------------------------ 10 X-RAY- FOS/BL RAPID 1.0 PRISM READ-TIME=6.18 1 358.44S NO SPLIT TRANSIENT ------------------------------------------------------------------------------------------------------------------------------------ 6568( 3) - 02/16/96 11:01 - [ 9] Visit: 04 Visit Requirements: AFTER 1 BY 29D to 31D ON HOLD SAME ORIENT AS 1 On Hold Comments: This is a target of opportunity. Coordinates, fluxes, and timing information are unknown until newly outbursting SXT triggers the program. Additional Comments: Reuse same guide stars as Visit 1. Check posn with 4x4 ACQ/PEAK. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 3 X-RAY- FOS/RD ACQ/PEA 0.5 MIRROR SCAN-STEP- 1 0.61S ONBOARD ACQ FOR 4 NO SPLIT TRANSIENT K X=0.207,SCAN- STEP- Y=0.207,SEARCH- SIZE-X=4,SEARCH Comments: acq/peak to check position after reacquiring -SIZE-Y=4 Visit 1's guide stars. FOS/BL exp time 1.28s. Exposures calculated for 10,000 counts. ------------------------------------------------------------------------------------------------------------------------------------ 4 X-RAY- FOS/RD RAPID 1.0 G270H READ-TIME=6.18 1 642.72S TRANSIENT Comments: Detailed observing plan is likely to change when actual target is ID'd. These exposures are guidelines only. ------------------------------------------------------------------------------------------------------------------------------------ 5 X-RAY- FOS/RD RAPID 1.0 G400H READ-TIME=6.18 1 401.7S TRANSIENT ------------------------------------------------------------------------------------------------------------------------------------ 6 X-RAY- FOS/BL RAPID 1.0 G130H READ-TIME=6.18 1 401.7S TRANSIENT Comments: G130H is where the most interesting lines are. Expand this exposure preferentially. ------------------------------------------------------------------------------------------------------------------------------------ 7 X-RAY- FOS/BL RAPID 1.0 G190H READ-TIME=6.18 1 401.7S TRANSIENT ------------------------------------------------------------------------------------------------------------------------------------ 8 X-RAY- FOS/BL RAPID 1.0 G160L READ-TIME=2.0 1 18M MAX DUR 18M NO SPLIT TRANSIENT Comments: Check Wavelength range for restricted readout. This exposure is for the echo- mapping experiment. Need the high telemetry rate, and onboard tape recorder. Only space for 18M of data on the tape recorder ( CAL/FOS 124) ------------------------------------------------------------------------------------------------------------------------------------ 6568( 3) - 02/16/96 11:01 - [ 10] Visit: 05 Visit Requirements: AFTER 1 BY 55D to 65D ON HOLD ORIENT 30D TO 29D FROM NOMINAL On Hold Comments: This is a target of opportunity. Coordinates, fluxes, and timing information are unknown until newly outbursting SXT triggers the program. Additional Comments: Orientation 30 degrees from nominal to enable reuse of these guide stars in subsequent visits. Need to check sign of the orientation offset from nominal after the target coordinates and date of the visit are known. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 X-RAY- FOS/BL ACQ/PEA 4.3 MIRROR SCAN-STEP- 1 2.44S ONBOARD ACQ FOR 2 NO SPLIT TRANSIENT K X=1.204,SEARCH- SIZE-X=3,SEARCH -SIZE-Y=1 Comments: 1st stage acq/peak. ACQ/PEAK using red side needs shorter exposures, but side switch is quicker BL -> RD. FOS/RD exp time 1.17s. Exposure times calculated for 10,000 counts, ------------------------------------------------------------------------------------------------------------------------------------ 2 X-RAY- FOS/BL ACQ/PEA 1.0 MIRROR SCAN-STEP- 1 2.53S ONBOARD ACQ FOR 3 NO SPLIT TRANSIENT K X=0.602,SCAN- STEP- Y=0.602,SEARCH- SIZE-X=2,SEARCH Comments: 2nd stage acq/peak. FOS/RD exp time 1.21s. -SIZE-Y=6 Exposure times calculated for 10,000 counts, ------------------------------------------------------------------------------------------------------------------------------------ 3 X-RAY- FOS/BL ACQ/PEA 0.5 MIRROR SCAN-STEP- 1 2.72S ONBOARD ACQ FOR 4 NO SPLIT TRANSIENT K X=0.207,SCAN- STEP- Y=0.207,SEARCH- SIZE-X=4,SEARCH Comments: 3rd stage acq/peak. FOS/BL exp time 1.30s. -SIZE-Y=4 Exposure times calculated for 10,000 counts, ------------------------------------------------------------------------------------------------------------------------------------ 4 X-RAY- FOS/BL RAPID 1.0 G130H READ-TIME=6.18 1 716.88S EXPAND NO SPLIT TRANSIENT Comments: G130H is where the most interesting lines are. Expand this exposure preferentially. No split to keep the Ohed out of target acq orbit. ------------------------------------------------------------------------------------------------------------------------------------ 5 X-RAY- FOS/BL RAPID 1.0 G190H READ-TIME=6.18 1 401.7S TRANSIENT ------------------------------------------------------------------------------------------------------------------------------------ 6 X-RAY- FOS/BL RAPID 1.0 G160L READ-TIME=2.0 1 14M MAX DUR 18M NO SPLIT TRANSIENT Comments: Check Wavelength range for restricted readout. This exposure is for the echo- mapping experiment. Need the high telemetry rate, and onboard tape recorder. Only space for 18M of data on the tape recorder ( CAL/FOS 124) ------------------------------------------------------------------------------------------------------------------------------------ 6568( 3) - 02/16/96 11:01 - [ 11] Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 7 X-RAY- FOS/RD RAPID 1.0 G270H READ-TIME=6.18 1 1198.92 NO SPLIT TRANSIENT Comments: Detailed observing plan is likely to change when actual target is ID'd. These exposures are guidelines only. No split to keep grating change Ohed in Occultation. ------------------------------------------------------------------------------------------------------------------------------------ 8 X-RAY- FOS/RD RAPID 1.0 G400H READ-TIME=6.18 1 599.46S TRANSIENT ------------------------------------------------------------------------------------------------------------------------------------ 9 X-RAY- FOS/RD RAPID 1.0 PRISM READ-TIME=6.18 1 358.44S NO SPLIT TRANSIENT ------------------------------------------------------------------------------------------------------------------------------------ 6568( 3) - 02/16/96 11:01 - [ 12] Visit: 06 Visit Requirements: AFTER 1 BY 85D to 95D ON HOLD SAME ORIENT AS 5 On Hold Comments: This is a target of opportunity. Coordinates, fluxes, and timing information are unknown until newly outbursting SXT triggers the program. Additional Comments: Reuse same guide stars as Visit 5. Check posn with 4x4 ACQ/PEAK. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 3 X-RAY- FOS/RD ACQ/PEA 0.5 MIRROR SCAN-STEP- 1 2.73S ONBOARD ACQ FOR 4 NO SPLIT TRANSIENT K X=0.207,SCAN- STEP- Y=0.207,SEARCH- SIZE-X=4,SEARCH Comments: acq/peak to check position after reacquiring -SIZE-Y=4 Visit 5's guide stars. FOS/BL exposure time 5.73s. Exposures calculated for 10,000 counts. ------------------------------------------------------------------------------------------------------------------------------------ 4 X-RAY- FOS/RD RAPID 1.0 G270H READ-TIME=6.18 1 642.72S NO SPLIT TRANSIENT Comments: Detailed observing plan is likely to change when actual target is ID'd. These exposures are guidelines only. NO SPLIT to keep grating change Ohed out of target acq orbit. ------------------------------------------------------------------------------------------------------------------------------------ 5 X-RAY- FOS/RD RAPID 1.0 G400H READ-TIME=6.18 1 401.7S TRANSIENT ------------------------------------------------------------------------------------------------------------------------------------ 6 X-RAY- FOS/BL RAPID 1.0 G130H READ-TIME=6.18 1 1062.96 TRANSIENT Comments: G130H is where the most interesting lines are. Expand this exposure preferentially. ------------------------------------------------------------------------------------------------------------------------------------ 7 X-RAY- FOS/BL RAPID 1.0 G190H READ-TIME=6.18 1 642.72S TRANSIENT ------------------------------------------------------------------------------------------------------------------------------------ 6568( 3) - 02/16/96 11:01 - [ 13] Visit: 07 Visit Requirements: AFTER 1 BY 115D to 125D ON HOLD ORIENT 30D TO 29D FROM NOMINAL On Hold Comments: This is a target of opportunity. Coordinates, fluxes, and timing information are unknown until newly outbursting SXT triggers the program. Additional Comments: Orientation 30 degrees from nominal to enable reuse of these guide stars in subsequent visits. Need to check sign of the orientation offset from nominal after the target coordinates and date of the visit are known. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 X-RAY- FOS/RD ACQ/PEA 4.3 MIRROR SCAN-STEP- 1 5.19S ONBOARD ACQ FOR 2 NO SPLIT TRANSIENT K X=1.204,SEARCH- SIZE-X=3,SEARCH -SIZE-Y=1 Comments: 1st stage acq/peak. FOS/BL exposure time 10.86s. Exposures calculated for 10,000 counts. ------------------------------------------------------------------------------------------------------------------------------------ 2 X-RAY- FOS/RD ACQ/PEA 1.0 MIRROR SCAN-STEP- 1 5.40S ONBOARD ACQ FOR 3 NO SPLIT TRANSIENT K X=0.602,SCAN- STEP- Y=0.602,SEARCH- SIZE-X=2,SEARCH Comments: 2nd stage acq/peak. FOS/BL exposure time -SIZE-Y=6 11.27s. Exposures calculated for 10,000 counts. ------------------------------------------------------------------------------------------------------------------------------------ 3 X-RAY- FOS/RD ACQ/PEA 0.5 MIRROR SCAN-STEP- 1 5.77S ONBOARD ACQ FOR 4 NO SPLIT TRANSIENT K X=0.207,SCAN- STEP- Y=0.207,SEARCH- SIZE-X=4,SEARCH Comments: 3rd stage acq/peak. FOS/BL exposure time -SIZE-Y=4 12.09s. Exposures calculated for 10,000 counts. ------------------------------------------------------------------------------------------------------------------------------------ 4 X-RAY- FOS/RD RAPID 1.0 G270H READ-TIME=6.18 1 642.72S NO SPLIT TRANSIENT Comments: Detailed observing plan is likely to change when actual target is ID'd. These exposures are guidelines only. ------------------------------------------------------------------------------------------------------------------------------------ 5 X-RAY- FOS/RD RAPID 1.0 G400H READ-TIME=6.18 1 642.72S TRANSIENT Comments: want the side switch overhead to eat into the RD side orbit, not the blue side. ------------------------------------------------------------------------------------------------------------------------------------ 6568( 3) - 02/16/96 11:01 - [ 14] Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exposure| Target |Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Number | Name |Config| Mode |or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 6 X-RAY- FOS/RD RAPID 1.0 PRISM READ-TIME=6.18 1 401.7S NO SPLIT TRANSIENT Comments: Side switch. Unused visibility in this orbit forces FOS RECON Ohed into this orbit rather than next. FINE TUNING NEEDED to maximise exposures in this orbit, w/out encroaching on next orbit. ------------------------------------------------------------------------------------------------------------------------------------ 7 X-RAY- FOS/BL RAPID 1.0 G130H READ-TIME=6.18 1 1680.96 EXPAND TRANSIENT Comments: G130H is where the most interesting lines are. Expand this exposure preferentially. ------------------------------------------------------------------------------------------------------------------------------------ 8 X-RAY- FOS/BL RAPID 1.0 G190H READ-TIME=6.18 1 599.46S NO SPLIT TRANSIENT ------------------------------------------------------------------------------------------------------------------------------------ 6568( 3) - 02/16/96 11:01 - [ 15] Summary Form for Proposal 6568 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Configurations FOS/BL FOS/RD ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACQ/PEAK RAPID ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters SCAN-STEP-X=1.204 SEARCH-SIZE-X=3 SEARCH-SIZE-Y=1 SEARCH-SIZE-Y=6 SEARCH-SIZE-Y=4 READ-TIME=6.18 READ-TIME=2.0 SEARCH-SIZE-X=4 SCAN-STEP-Y=0.207 SCAN-STEP-X=0.207 SEARCH-SIZE-X=2 SCAN-STEP-Y=0.602 ------------------------------------------------------------------------------------------------------------------------------------ Proposal Category GO ------------------------------------------------------------------------------------------------------------------------------------ Scientific Category BINARIES AND STAR FORMATION ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements BETWEEN 01-JUL-96 AND 06-JUL-96 ON HOLD ORIENT 30D TO 29D FROM NOMINAL ONBOARD ACQ FOR 2 NO SPLIT ONBOARD ACQ FOR 3 NO SPLIT ONBOARD ACQ FOR 4 NO SPLIT EXPAND NO SPLIT MAX DUR 18M NO SPLIT AFTER 1 BY 9D to 11D ON HOLD SAME ORIENT AS 1 AFTER 1 BY 19D to 21D ON HOLD SAME ORIENT AS 1 AFTER 1 BY 29D to 31D ON HOLD SAME ORIENT AS 1 AFTER 1 BY 55D to 65D ON HOLD ORIENT 30D TO 29D FROM NOMINAL AFTER 1 BY 85D to 95D ON HOLD SAME ORIENT AS 5 AFTER 1 BY 115D to 125D ON HOLD ORIENT 30D TO 29D FROM NOMINAL EXPAND ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements MIRROR G130H G190H PRISM G160L G270H G400H ------------------------------------------------------------------------------------------------------------------------------------ Target Names X-RAY-TRANSIENT ------------------------------------------------------------------------------------------------------------------------------------