TITLE: GCN GRB OBSERVATION REPORT NUMBER: 3451 SUBJECT: XRF050522, BVRcIc field photometry DATE: 05/05/22 19:08:03 GMT FROM: Arne A. Henden at AAVSO A. Henden (USRA/USNO) reports on behalf of the USNO GRB Team: We have acquired BVRcIc all-sky photometry for an 11x11arcmin field centered on the coordinates for the INTEGRAL burst XRF050522 (Gotz, et al. GCN 3446) with the USNOFS 1.0-m telescope on one photometric night but with bright moonlight. Stars brighter than V=12.0 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/xrf050522.dat The astrometry in this file is based on linear plate solutions with respect to UCAC2. The external errors are less than 100mas. The estimated external photometric error is about 0.02mag. The first image was taken 16 minutes after the burst, and show no new sources in the INTEGRAL error box down to a plate limit of Rc=18.5. Since no afterglow has been reported, we do not anticipate any further observations at this time. However, as always, you should check the dates on the .dat file prior to final publication to get the latest photometry. There is a README file on the ftp directory to give you information about the procedures used to calibrate these fields.