[vsnet-grb-info 7738] GRB 090426: GAO 150cm telescope Optical Observation

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  9292
SUBJECT: GRB 090426: GAO 150cm telescope Optical Observation
DATE:    09/04/29 14:27:50 GMT
FROM:    Kenzo Kinugasa at Gunma Astro. Obs/Japan  <kinugasa at astron.pref.gunma.jp>

K. Kinugasa, S. Honda, O. Hashimoto, H. Takahashi, H. Taguchi
 (Gunma Astronomical Observatory) report:

 The position of GRB 090426 (Cummings et al., GCN 9254) was
observed with the 150 cm telescope of Gunma Astronomical
Observatory. Starting at 13:20 and 13:48 UT (0.52 and 1.0 hours
 after the trigger), Ic and Rc frames were acquired for sets of
3 x 3-min and  5 x 5-min exposures, respectively.

 We detected the optical counterpart (e.g., Xin et al., GCN 9255;
 Oates et al., GCN 9265) in all frames. We estimated the Rc and Ic
magnitudes relative to USNO-B1.0 R2 and I, respectively.

mid-UT     exp        mag.
-----------------------------------
13:24:45   3x3min     Ic=18.5+-0.3
14:03:58   5x5min     Rc=19.9+-0.1
-----------------------------------