TITLE: GCN GRB OBSERVATION REPORT NUMBER: 1028 SUBJECT: GRB010324, field photometry DATE: 01/03/28 19:49:48 GMT FROM: Arne A. Henden at USNO/USRA A. Henden (USRA/USNO) reports on behalf of the USNO GRB team: We have acquired preliminary BVRcIc all-sky photometry for an 11x11 arcmin field centered at the RXTE ASM localization (GCN/RXTE ASM; Hurley et al., GCN #1011) for GRB010324 with the USNOFS 1.0-m telescope on one marginally photometric night. Stars brighter than V=15 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/grb010324.dat The astrometry in this file is based on linear plate solutions with respect to USNO-A2.0. The internal errors are less than 100mas. We have less confidence than usual in the quality of this photometry. The all-sky reduction of standards had an RMS error of 1.4 percent, but a high-airmass standard observation that immediately followed the GRB field observation deviated from the mean by 4 percent. We will attempt to reobserve this field on the next photometric night.