{
  "bibcode": "2005GCN..3850....1R",
  "body": "E.S. Rykoff (U Mich) reports on behalf of the ROTSE collaboration:\n\nROTSE-IIIc, located at the H.E.S.S. site at Mt. Gamsberg, Namibia, \nresponded to GRB 050822 (Swift trigger 151486), producing images \nbeginning 5.8 s after the GCN notice time. An automated response took \nthe first image at 03:50:00.8 UT, 31.7 s after the start of the burst, \nand during the gamma-ray emission (GCN 3849).  These observations were \naffected by proximity to the full moon as well as early twilight. We \ntook 10 5-sec, and 70 20-sec eposures. These unfiltered images are \ncalibrated relative to USNO A2.0 (R).\n\nComparison to the DSS (second epoch) reveals no new sources within the \n3-sigma BAT error circle or at the XRT position, for both single images \nand coadding into sets of 10. Individual images have limiting magnitudes \nranging from 15.0-16.2; we set the following specific limits.\n\nstart UT       end UT      t_exp(s)   mlim   t_start-tGRB(s)  Coadd?\n--------------------------------------------------------------------\n03:50:00.8    3:50:05.8         5     15.1           31.7       N\n03:50:00.8    3:51:24.8        84     16.6           31.7       Y\n03:51:25.5    3:56:12.0       286     17.5          412.6       Y",
  "circularId": 3850,
  "createdOn": 1124685808000,
  "email": "erykoff@umich.edu",
  "subject": "GRB 050822: ROTSE-III Prompt Optical Limits",
  "submitter": "Eli Rykoff at U of Michigan/ROTSE  <erykoff@umich.edu>",
  "eventId": "GRB 050822"
}