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TITLE: GCN GRB OBSERVATION REPORT NUMBER: 1950 SUBJECT: GRB030324, BVRcIc field photometry DATE: 03/03/24 20:26:15 GMT FROM: Arne A. Henden at USNO/USRA <aah@nofs.navy.mil> A. Henden (USRA/USNO) reports on behalf of the USNO GRB team: We have acquired BVRcIc all-sky photometry for a 20x20 arcmin field centered at the coordinates for the HETE burst GRB030324 (HETE trigger 2641) with the USNOFS 1.0-m telescope on one very marginal photometric night. Stars brighter than V=13.5 are saturated and should be used with care. We have placed the photometric data on our anonymous ftp site: ftp://ftp.nofs.navy.mil/pub/outgoing/aah/grb/grb030324.dat The astrometry in this file is based on linear plate solutions with respect to UCAC2. The external errors are less than 100mas. There were approaching clouds from a weak frontal system that do not appear to have reached this field until well after the observations, but until further calibration is performed, a systematic error is possible. Based purely on the standard star observations, the estimated external photometric error is 0.03mag. If an OT is discovered, this calibration will be extended with additional nights. We will not be performing U-band calibration unless requested. As always, you should check the dates on the .dat file prior to final publication to get the latest photometry.
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