GCN Circular 1242
A. Henden (USRA/USNO) reports on behalf of the USNO GRB team: We have acquired UBVRcIc all-sky photometry for an 11x11 arcmin field that is approximately centered on the position of supernovae SN2002ap with the USNOFS 1.0-m telescope on one photometric night. Since the supernovae is expected to brighten further, exposures were short so that no star in the field is saturated. We have placed the photometric data on our anonymous ftp site: ftp://ftp.nofs.navy.mil/pub/outgoing/aah/sequence/sn2002ap.dat The current photometry has a potential external zero-point error of less than 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. As conditions permit, this file will be extended to include more photometric nights. M74/NGC628 is a very popular object to photograph since it is large, bright and beautiful. A causual search of the public archives for several observatories indicates that there are dozens of deep plates and CCD images of the galaxy, many of which will include the supernovae region. For example, two such V-band images at NOFS have approximately the same depth and resolution as the V-band image indicated by Smartt et al. (GCN 1240). A simple data-mining exercise should give a reasonable time history of any precursor over several decades. Towards that end, we will extend the photometry file down to about V=22 in the near future.