{
  "bibcode": "2009GCN..9519....1C",
  "body": "A. Carraminana (INAOE), C. Alvarez Ochoa (UNACh)\nand G. Miramon (OAGH-INAOE) report:\n\nWe clearly detected the optical counterpart of GRB 090618 (GCN 9512)\nwith the 2.1m telescope of the Observatorio Astrofisico\nGuillermo Haro at Cananea, Sonora, Mexico. Observations started\nat 08:43 UT, 14 minutes after the BAT trigger and continued\nuntil dawn. Observations were made under non photometric conditions.\n\nWe measured a lineal faddening of the burst compared to\na reference star of amplitude 0.5 magnitudes between t=870s\nto 1600s. A non calibrated graph is available at\n\nhttp://www.inaoep.mx/~alberto/gamma/grb090618_lc.jpg\n\nSpectroscopic data were also obtained and are under analysis.",
  "circularId": 9519,
  "createdOn": 1245328633000,
  "email": "alberto@inaoep.mx",
  "subject": "Optical observations of GRB 090618",
  "submitter": "Alberto Carraminana at AzTEC  <alberto@inaoep.mx>",
  "eventId": "GRB 090618"
}