TITLE: GCN GRB OBSERVATION REPORT NUMBER: 1697 SUBJECT: GRB021112, BVRI field photometry DATE: 02/11/19 02:56:54 GMT FROM: Arne A. Henden at USNO/USRA A. Henden (USRA/USNO) reports on behalf of the USNO GRB team: We have acquired shallow BVRcIc all-sky photometry for a 20x20 arcmin field centered about 7arcmin north and 7 arcmin west of the position of the variable source mentioned in Strolger et al. (GCN1696), but within the error box for GRB021112 (Fenimore et al.,GCN1682), using the USNOFS 1.0-m telescope on one marginal night. Stars brighter than V=13.0 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/grb021112.dat The astrometry in this file is based on linear plate solutions with respect to USNO-A2.0. While the night was photometric, there was poor and variable seeing due to a frontal passage. We estimate the present zeropoint errors to be about 0.03mag. If the variable source is confirmed to be the afterglow for GRB021112, we will extend the calibration with additional nights to guard against a systematic zeropoint error. You should check the dates on the .dat file prior to final publication to get the latest photometry.