GCN Circular 9305
Subject
GRB 090424: YNAO-GMG observations
Date
2009-04-30T11:10:12Z (15 years ago)
From
Jirong Mao at Yunnan Obs <jirongmao@ynao.ac.cn>
J. Mao (YNAO & INAF-OAB), G. Cha and J. Bai (YNAO) report on behalf of the GMG group:
We observed the optical counterpart of GRB 090424 (Cannizzo et al., GCN 9223) using
one 2.4-m telescope located at Gao-Mei-Gu (GMG) about 40 minutes after the trigger and
obtained the following magnitudes:
Start UT Exposure Filter mag err
-------------------------------------------------
14:53:41 10 sec R 17.51 0.02
14:56:41 30 sec B 18.50 0.03
15:01:22 30 sec V 18.57 0.02
15:03:55 20 sec I 17.68 0.02
17:26:58 75 sec R 18.89 0.04
We continued our observations of GRB 090424 in R band started at 13:42:00 UT on April
25, 2009. After 20 minutes of exposure time, we obtained the magnitude R=20.59 +/-
0.07 mag.
All the calibrations were processed by nearby SDSS stars.
The telescope is charged by Yunnan Observatory (YNAO), Chinese Academy of Sciences.
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