TITLE: GCN CIRCULAR NUMBER: 7003 SUBJECT: GRB 071025: SQIID JHK photometry DATE: 07/10/25 22:43:19 GMT FROM: Xiaohui Fan at U of Arizona L. Jiang, F. Bian, X. Fan (Steward Observatory, University of Arizona) reports: Using the Simultaneous Quad Infrared Imaging Device (SQIID) on the Kitt Peak Mayall 4-meter Telescope, we observed GRB 071025 in J, H, K bands simultaneously, beginnig at UT 2007-10-25-05:56:59. With total exposure time of 240 sec in all three bands, we clearly detected the afterglow. Calibrated using local 2MASS sources, the object is at J=17.34 +/- 0.05 H=16.37 +/- 0.05 K=15.45 +/- 0.05 The photometric errors are dominated by the zeropoint uncertainties from our calibration procedure. The photon noise on the measuremens is <0.01. The message may be cited. -- Xiaohui Fan Steward Observatory The University of Arizona 933 N. Cherry Ave. Tucson, AZ 85721-0065 Email: fan@as.arizona.edu Tel: (520) 626-7558 Fax: (520) 621-1532 URL: http://sancerre.as.arizona.edu/~fan