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HUBBLE SPACE TELESCOPE
DAILY REPORT # 3361
PERIOD COVERED: DOY 132
OBSERVATIONS SCHEDULED

NICMOS 8791

Part 2 of 2

ACS 9472
A Snapshot Survey for Gravitational Lenses among z >= 4.0 Quasars

Over the last few years, the Sloan Digital Sky Survey has
revolutionized the study of high-redshift quasars by discovering over
200 objects with redshift greater than 4.0, more than doubling the
number known in this redshift interval.  The sample includes eight of
the ten highest redshift quasars known. We propose a snapshot imaging
survey of a well-defined sample of 250 z > 4.0 quasars in order to
find objects which are gravitationally lensed. Lensing models
including magnification bias predict that at least 4% of quasars in a
flux-limited sample at z > 4 will be multiply lensed. Therefore this
survey should find of order 10 lensed quasars at high redshift; only
one gravitationally lensed quasar is currently known at z > 4. This
survey will provide by far the best sample to date of high-redshift
gravitational lenses. The observed fraction of lenses can put strong
constraints on cosmological models, in particular on the cosmological
constant Lambda. In addition, magnification bias can significantly
bias estimates of the luminosity function of quasars and the
evolution thereof; this work will constrain how important an effect
this is, and thereby give us a better understanding of the evolution
of quasars and black holes at early epochs, as well as constrain
models for black hole formation. 

WFPC2 9592
WFPC2 CYCLE 11 Standard Darks

This dark calibration program obtains dark frames every week in order
to provide data for the ongoing calibration of the CCD dark current
rate, and to monitor and characterize the evolution of hot pixels.
Over an extended period these data will also provide a monitor of
radiation damage to the CCDs. 

WFPC2 9594
WFPC2 CYCLE 11 SUPPLEMENTAL DARKS pt2/3

This dark calibration program obtains 3 dark frames every day to
provide data for monitoring and characterizing the evolution of hot
pixels 

WFPC2 9596
WFPC2 CYCLE 11 INTERNAL MONITOR

This calibration proposal is the Cycle 11 routine internal monitor
for WFPC2, to be run weekly to monitor the health of the cameras. A
variety of internal exposures are obtained in order to provide a
monitor of the integrity of the CCD camera electronics in both bays
{gain 7 and gain 15}, a test for quantum efficiency in the CCDs, and
a monitor for possible buildup of contaminants on the CCD windows.

STIS 9612

STIS CCD Hot Pixel Annealing Cycle 11

The effectiveness of the CCD hot pixel annealing process is assessed
by measuring the dark current behavior before and after annealing and
by searching for any window contamination effects. In addition CTE
performance is examined by looking for traps in a low signal level
flat. Follows on from proposal 8906. 

STIS 9613

STIS CCD Spectroscopic Flats C11

Obtain CCD flats on the STIS CCD in spectroscopic mode.

ACS 9657

ACS Internal Flat Field Stability

The flat field stability and characterization obtained during the
ground calibration and SMOV phases will be tested and verified
through a sub-sample of the filter set. Only internal exposures with
the calibration lamps will be required.

ACS 9674

CCD Daily Monitor

This program consists of basic tests to monitor, the read noise, the 
development of hot pixels and test for any source of noise in ACS CCD
detectors. This programme will be executed once a day for the entire
lifetime of ACS. 

NICMOS 9702

NICMOS Parallel Thermal Background

NICMOS Camera 2 pure parallel exposures in the F222M and F237M
filters to establish the stability of the HST+NCS+Instrument thermal
emission. This data will be compared against the already available
Camera 3 measurements in F222M which show an increased thermal
background. 

WFPC2 9709

POMS Test Proposal: WFII parallel archive proposal

This is the generic target version of the WFPC2 Archival Pure
Parallel program. The program will be used to take parallel images of
random areas of the sky, following the recommendations of the 2002
Parallels Working Group. 

WFPC2 9710

POMS Test Proposal: WFII backup parallel archive proposal

This is a POMS test proposal designed to simulate scientific plans.

FLIGHT OPERATIONS SUMMARY:

Significant Spacecraft Anomalies: (The following are preliminary
reports of potential non-nominal performance that will be
investigated.) 

COMPLETED OPS REQs: None

OPS NOTES EXECUTED:
1108-2  Perform Observation Re-Dumps on the Partial Obs. Level
         {at} 132/2006z, 132/2007z, 133/0016z, 133/0020z
1111-0  Change Limits MAMA1 Threshold Voltage {at} 133/0304z

                SCHEDULED     SUCCESSFUL    FAILURE TIMES
FGS GSacq          07             07
FGS REacq          09             09
FHST Update        14             14
LOSS of LOCK

SIGNIFICANT EVENTS:

Battery 2 capacity, as measured in 5/7/03 Capacity Test, was 58.86
Ah. Capacity estimate from pre SM-3B was 40.2 Ah.  Battery 2 was last
tested in November 1998 with a capacity of 70.6 Ah.

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