TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2195 SUBJECT: GRB 030429: IR photometry with IRSF/SIRIUS DATE: 03/05/02 12:25:44 GMT FROM: Nial Tanvir at IofA U.Cambridge S. Nishiyama, D. Baba, T. Nagata (Nagoya U.), N. Matsunaga (U. of Tokyo), and IRSF/SIRIUS team (Nagoya U., NAOJ), N. Kawai (Tokyo Tech), N. Tanvir (U. of Hertfordshire) report: We observed the SXC error box of GRB 030429 (HETE alert 2695) with the Simultaneous three-color InfraRed Imager for Unbiased Survey (SIRIUS) on the Nagoya-SAAO 1.4m telescope (IRSF). For the afterglow candidate proposed by Gilmore et al. (GCN 2184), we get the J H Ks magnitudes at 4 epochs begining 6.6 hrs after the burst: UTmid J H Ks Apr 29.727 18.8 17.8 17.0 Apr 29.873 19.2 18.3 17.5 Apr 30.005 18.9 18.1 17.4 ---------------------------- Apr 30.768 19.0 18.4 17.8 We estimate the uncertainty in the magnitudes is about 0.2 mag. The Ks magnitude seems to be consistent with that at April 30.20 reported by Fynbo et al. (GCN 2185). These observations confirm the fading behaviour, but they were made under non-photometric conditions, and the effect of the nearby NW source (GCN 2185) makes the photometry less reliable, suggesting the results should be treated with caution. This message may be cited.