HUBBLE SPACE TELESCOPE

       DAILY REPORT #2971

PERIOD COVERED:  0000Z (UTC) 10/04/01 - 0000Z (UTC) 10/05/01

Daily Status Report as of 278/0000Z

1.0 OBSERVATIONS SCHEDULED AND ACCOMPLISHED:

    1.1 Completed Three Sets of WF/PC-2 9042 (An Archive To Detect The 
Progenitors Of Massive, Core-Collapse Supernovae)

         The WF/PC-2 was used to search for supernovae which have massive 
star progenitors.  The already extensive HST archive and high-resolution 
ground-based images of galaxies within ~20 Mpc enables us to resolve and 
quantify their individual bright stellar content.  As massive, evolved 
stars are the most luminous single objects in a galaxy, the progenitors of 
core-collapse supernovae should be directly detectable on pre-explosion 
images.  One Type II progenitor has been observed this year, and the 
investigators have proposed a short, companion WFPC2 proposal to confirm 
this candidate and identify a second.  The observations completed nominally.

    1.2 Completed Three Sets of STIS/CCD 9285 (POMS Test Proposal: STIS 
Non-scripted Parallel Proposal Continuation III)

        The Space Telescope Imaging Spectrograph (CCD) was used to make low 
galactic latitude, non-scripted parallel observations as part of a POMS 
test proposal.  The observations were completed as planned, and no 
anomalies were reported.

    1.3 Completed Two Sets of WF/PC-2 8936 (Cycle 10 Supplemental Darks Pt1/3)

        The WF/PC-2 was used to perform a dark calibration program that 
obtains three dark frames every day to provide data for monitoring and 
characterizing the evolution of hot pixels.  The proposal completed with no 
reported problems.

    1.4 Completed STIS/CCD 9066 (Closing in on the Hydrogen Reionization 
Edge of the Universe)

        The Space Telescope Imaging Spectrograph (CCD) was used in parallel 
constrain the Hydrogen reionization edge in emission that marks the 
transition from a neutral to a fully ionized IGM at a predicted 
redshifts.  The proposal completed uneventfully.

    1.5 Completed Two Sets of STIS/CCD 9114 (SINS: The Supernova Intensive 
Study-- Cycle 10)

        The Space Telescope Imaging Spectrograph (CCD) was used to perform 
closer observations of supernovae that will create the chemical history of 
the Universe, energize the interstellar gas, stiffen the spine of the 
extragalactic distance scale and provide the only evidence for an 
accelerating universe.  A violent encounter is underway between the 
fast-moving debris and the stationary inner ring.  Monitoring this 
interaction will help solve the riddles of stellar evolution posed by the 
enigmatic three-ring system of SN 1987A.  Our UV observations of Ly- Alpha 
emission reveal the present location and velocity of a remarkable reverse 
shock that provides a unique laboratory for studying fast shocks and a 
powerful tool for dissecting the structure of the vanished star.  No 
problems were encountered.

    1.6 Completed Four Sets of WF/PC-2 9244 (POMS Test Proposal: WFII 
Parallel Archive Proposal Continuation)

        The WF/PC-2 was used to perform a generic target version of the 
Archival Pure Parallel program.  The program will be used to take parallel 
images of random areas of the sky, following the recommendations of the 
Parallels Working Group.  The observations completed with no anomalous 
activity.

    1.7 Completed Four Sets of WF/PC-2 8815 (Cycle 9 Earth Flats)

        The WF/PC-2 was used to monitor flatfield stability.  This proposal 
obtains sequences of Earth streak flats to construct high quality flat 
fields for the WF/PC-2 filter set.  These flat fields will allow mapping of 
the OTA illumination pattern and will be used in conjunction with previous 
internal and external flats to generate new pipeline superflats.  The 
proposal completed nominally.

    1.8 Completed Two Sets of STIS/CCD 8901 (Dark Monitor-Part 1)

        The Space Telescope Imaging Spectrograph (CCD) was used to monitor 
the darks.  There was no anomalous activity.

    1.9 Completed STIS/CCD 8903 (Bias Monitor - Part 1)

        The Space Telescope Imaging Spectrograph (CCD) was used to monitor 
the bias in the 1x1, 1x2, 2x1, and 2x2 bin settings at gain=1, and 1x1 at 
gain = 4 to build up high-S/N superbiases and track the evolution of hot 
columns.  There were no problems.

    1.10 Completed STIS/MA2 8920 (Cycle 10 MAMA Dark Measurements)

        The Space Telescope Imaging Spectrograph (MA2) was used to perform 
the routine monitoring of the MAMA detector dark noise, and is the primary 
means of checking on health of the MAMA detectors systems through frequent 
monitoring of the background count rate.  The proposal completed with no 
reported anomalous activity.

    1.11 Completed Six Sets of WF/PC-2 8932 (Decontaminations and 
Associated Observations Pt. 1/3)

        The WF/PC-2 was used for the monthly WFPC2 decons.  Also included 
are instrument monitors tied to decons: photometric stability check, focus 
monitor, pre- and post-decon internals {bias, intflats, kspots, &and 
darks}, UV throughput check, VISFLAT sweep, and internal UV flat check.  No 
problems were reported.

    1.12 Completed STIS/CCD 8845 (Spectroscopic Flats C9)

        The Space Telescope Imaging Spectrograph (CCD) was used to obtain 
CCD flats in the spectroscopic mode.  The observations completed with no 
reported problems.

    1.13 Completed Seven Sets of STIS/CCD 8910 (Sparse Field CTE 
Test-Internal {Cycle 10})

        The Space Telescope Imaging Spectrograph (CCD) was used to perform 
CTE measurements that are made using the "sparse field test", along both 
the serial and parallel axes.  This program needs special commanding to 
provide {a} off-center MSM positionings of some slits, and {b} the ability 
to read out with any amplifier {A, B, C, or D}.  No problems were encountered.

    1.14 Completed STIS/CCD 8914 (Sensitivity Monitor C10)

        The Space Telescope Imaging Spectrograph (CCD) was used to monitor 
the sensitivity of each CCD grating mode to detect any change due to 
contamination or other causes.  The STIS focus is also monitored in an 
imaging mode.  There was no anomalous activity.

    1.15 Completed STIS/CCD 9136 (T Tauri Star Coronagraphic Survey: A PMS 
Protoplanetary Disk Census)

      The Space Telescope Imaging Spectrograph (CCD) was used to observe 
pre-main sequence solar-mass stars, the T Tauri stars that Millimeter and 
IR studies suggest at least 50 percent have circumstellar disks similar to 
the disk from which our planetary system formed.  High spatial resolution, 
high dynamic range imaging of such systems will map the spatial 
distribution of material around the star, constraining the disk sizes and 
inclinations, and provide a first assessment of when structure in the disk, 
such as cleared central zones and annuli, which has been linked to planet 
formation, develops.  All observations completed without incident.

2.0 FLIGHT OPERATIONS SUMMARY:

    2.1 Guide Star Acquisitions:
       Scheduled Acquisitions:  9
Successful: 9

  Scheduled Re-acquisitions:  3
Successful:  3

    2.2 FHST Updates:
Scheduled: 24
Successful: 24

    2.3 Operations Notes:

        Using ROP SR-1A, the SSR EDAC error counter was cleared four times.

        Per an operations note, WF/PC-2 limits were managed for the 
interval 277/2043Z to 278/0718Z when the instrument was undergoing a 
decontamination exercise.

3.0 SIGNIFICANT FORTHCOMING EVENTS:

        Continuation of normal science observations and calibrations.

/CAW