TITLE: GCN GRB OBSERVATION REPORT NUMBER: 1042 SUBJECT: GRB010412, field photometry DATE: 01/04/18 15:29:10 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 an 11x11 arcmin field that covers the center of the error box for GRB010412 with the USNOFS 1.0-m telescope on one 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/grb010412.dat The current photometry has a potential external zero-point error of about two percent. The astrometry in this file is based on linear plate solutions with respect to USNO-A2.0. The internal errors are less than 100mas. Since this is a crowded field, you should check the DSS images and only use stars for calibration that do not have neighbors. Further calibration of this field will be performed if an optical afterglow is identified.