!  File:  2502C.PROP
!  Database:  PEPDB
!  Date:  17-FEB-1994:07:34:22

coverpage:

  title_1:         GRAVITATIONAL MICROLENSING
    sci_cat:       QUASARS & AGN
    proposal_for:  GO
    cont_id:       1059
    pi_title:      DR.
    pi_fname:      SJUR
    pi_lname:      REFSDAL
    pi_inst:       HAMBURG OBSERVATORY
    pi_country:    FRG
    pi_phone:      40-7252-4124 OR 4112
    keywords_1:    QUASAR, PHOTOMETRY
    hours_pri:     0.25
    num_pri:       1
    foc:           X
    pi_position:   SJUR REFSDAL
    off_fname:     DIETER
    off_lname:     REIMERS
    off_title:     UNIVERSITY PROFESSOR
    off_inst:      HAMBURG OBSERVATORY
    off_addr_1:    GOJENBERGSWEG 112
    off_city:      2050 HAMBURG 80
    off_zip:       D-2050
    off_country:   F. REP. OF GERMANY
    off_phone:     20-72524112
! end of coverpage

abstract:

    line_1:        Images of QSO 2237+0305 will be compared to look for variations in the
    line_2:        luminosity ratios of the components. Such variations would be an observational
    line_3:        proof of microlensing. Variations of about 0.05 mag/year are expected in two of
    line_4:        the images if the quasar radius is 0.1 light years or less.
    line_5:        HST spatial resolution is required to allow the precise comparison of the QSO
    line_6:        components of the lensed system.

!
! end of abstract

general_form_proposers:

  lname:           CRANE
    fname:         PHILIPPE
    inst:          EUROPEAN SOUTHERN OBSERVATORY
    country:       FRG
    esa:           X

!

  lname:           REFSDAL
    fname:         SJUR
    title:         P.I.
    inst:          HAMBURG OBSERVATORY
    country:       FRG
    esa:           Y

!
! end of general_form_proposers block

general_form_text:

  question:        3
    section:       1
    line_1:        These observations are a continuation of the observations
    line_2:        made in the GTO program 1059. The idea of these observations
    line_3:        is to monitor the brightness of the individual images in the
    line_4:        gravitational lens system to look for microlensing events. The
    line_5:        usefulness of HST for this purpose is that it permits a very easy
    line_6:        and clean separation of the images which is not always guaranteed
    line_7:        from the ground, and it allows an important extension of the observing
    line_8:        season when the object is impossible to observe from the ground.

!

  question:        4
    section:       0
    line_1:        This section is unchanged from the
    line_2:        original submission.

!

  question:        5
    section:       0
    line_1:        In order to maximally profit from this observation, it should
    line_2:        be scheduled in the period from January 1 until as close to the
    line_3:        solar avoidance cutoff as possible. This will permit an extension
    line_4:        of the observing season of about a month over what it would be
    line_5:        if only ground based obsevations were made.
    line_7:        The justification for the observing time remains basically as
    line_8:        we submitted it, except that it now includes an ND1 filter which
    line_9:        was determined to be need in order keep all images with in the linear
    line_10:       range.

!
!end of general form text

general_form_address:

  lname:           REFSDAL
    fname:         SJUR
    title:         DR.
    category:      PI
    inst:          HAMBURG OBSERVATORY
    addr_1:        GOJENBERGSWEG 112
    city:          2050 HAMBURG 80
    country:       FR GERMANY

!

  lname:           CRANE
    fname:         PHILIPPE
    category:      CON
    inst:          EUROPEAN SOUTHERN OBSERVATORY
    addr_1:        KARL-SCHWARZSCHILD-STR. 2
    city:          D-8046 GARCHING BEI MUNCHEN
    country:       GERMANY, WEST
    phone:         +49-89-320-06-230
    telex:         230-021

!
! end of general_form_address records

fixed_targets:

    targnum:       1
    name_1:        G2237+0305
    descr_1:       QSO IN GALAXY
    pos_1:         RA = 22H 40M 30.3S +/- .1S,
    pos_2:         DEC = +03D 21' 31" +/- 1.0"
    equinox:       2000
    rv_or_z:       Z = 1.7
    comment_1:     J ~/= 15.9;
    comment_2:     GALAXY'S REDSHIFT 2(GAL)=0.039

!
! end of fixed targets

! No solar system records found

! No generic target records found

exposure_logsheet:

    linenum:       1.000
    targname:      G2237+0305
    config:        FOC/96
    opmode:        IMAGE
    aperture:      512X512
    sp_element:    F342W , F1ND
    num_exp:       1
    time_per_exp:  15M
    priority:      1
    req_1:         AT JD2448623 +/- 7 D ;
    req_2:         CYCLE 1

!
! end of exposure logsheet

! No scan data records found