TITLE: GCN GRB OBSERVATION REPORT NUMBER: 890 SUBJECT: GRB001120, optical observations DATE: 00/11/22 21:27:14 GMT FROM: Arne A. Henden at USNO/USRA D. Kaiser (Crescent Moon Observatory) D. Durig (Cordell-Lorenz Observatory) A. Henden (USRA/USNO) report: We have observed the error box of GRB001120 as part of the monitoring effort by the AAVSO GRB network. This error box is quite long in RA (30arcmin), and so the images only cover the central portion of that box, missing the extreme east and west corners. There are a few galaxies visible, so the visual extinction is not large in this high galactic latitude field (bII=-43). The limiting magnitude in the table below is based on the r-magnitude of a set of USNO-A2.0 stars in the field. Unfiltered observations are listed with a "C" in the filter column. The seeing measures are an upper limit due to undersampling in both datasets. -------------------------------------------------------------------------- Date (UT) Telescope filter RA width exposure seeing limiting (Midpt) (arcmin) (sec) (arcsec) mag. -------------------------------------------------------------------------- Nov. 22.036 0.35-m R 17.9 12 * 300 4.4 19.8 Nov. 22.051 0.30-m C 26.9 10 * 600 3.8 20.8 -------------------------------------------------------------------------- All objects on the Nov22.036 dataset are also visible in the scans of the POSS-2 red plate from the NOFS PMM pixel server. The Nov22.051 dataset goes slightly deeper than the POSS-2 plate, and a second CCD epoch will be necessary to exclude the fainter objects.