[vsnet-grb-info 8584] GRB 091024: YNAO-GMG observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  10092
SUBJECT: GRB 091024: YNAO-GMG observations
DATE:    09/10/27 12:12:05 GMT
FROM:    Jirong Mao at Yunnan Obs  <jirongmao at ynao.ac.cn>

J. Mao (YNAO & INAF-OAB), S. Li and J. Bai (YNAO) report on behalf of the GMG group:

We observed the optical afterglow of GRB 091024 (Marshall et al., GCN 10062) using one 2.4-m telescope located at Gao-Mei-Gu (GMG, Yunnan Observatory) about 3 hours after the trigger. Some preliminary results are shown below:

Start UT   Filter  mag   err
-------------------------------------
11:52:13     R    19.66  0.02 
12:54:35     R    20.18  0.03  
15:11:33     R    21.03  0.05


All the calibrations were processed by nearby USNO stars in the images and without extinction correction. The detailed analysis is ongoing.
 
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