{
  "bibcode": "2009GCN.10092....1M",
  "body": "J. Mao (YNAO & INAF-OAB), S. Li and J. Bai (YNAO) report on behalf of the GMG group:\n\nWe 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:\n\nStart UT   Filter  mag   err\n-------------------------------------\n11:52:13     R    19.66  0.02 \n12:54:35     R    20.18  0.03  \n15:11:33     R    21.03  0.05\n\n\nAll the calibrations were processed by nearby USNO stars in the images and without extinction correction. The detailed analysis is ongoing.\n \nThis message might be cited.",
  "circularId": 10092,
  "createdOn": 1256645525000,
  "email": "jirongmao@ynao.ac.cn",
  "subject": "GRB 091024: YNAO-GMG observations",
  "submitter": "Jirong Mao at Yunnan Obs  <jirongmao@ynao.ac.cn>",
  "eventId": "GRB 091024"
}