TITLE: GCN CIRCULAR NUMBER: 9120 SUBJECT: GRB090408 : TAOS optical observations DATE: 09/04/10 07:28:36 GMT FROM: Kuiyun Huang at ASIAA GRB090408 : TAOS optical observations S.K. King, K.Y. Huang, S.Y. Wang and the TAOS team The four 50cm TAOS telescopes observed GRB 090408 position (Stroh et al, GCN9110) at 91s after the burst. No new optical emission was detected in the BAT possition error range. The 3-sigma limiting magnitude, compared with USNOB red stars, are as follows: ------------------------------------------------------------------------------ Mean Dealy(s) Exposure time Limit mag. Telescope ------------------------------------------------------------------------------- 157 5s x15 15.2 TAOSB 221.5 1s x60 14.8 TAOSD -------------------------------------------------------------------------------- -- Lijin (Kuiyun) Huang Postdoctoral Fellow Institute of Astronomy & Astrophysics, Academia Sinica (ASIAA) Phone: 886-2-3365 2200 x728