{
  "bibcode": "2007GCN..7060....1R",
  "body": "E.S. Rykoff (UCSB), F. Yuan (U Mich), W. Rujopakarn (Steward), report on \nbehalf of the ROTSE collaboration:\n\nROTSE-IIIc, located at the H.E.S.S. site at Mt. Gamsberg, Namibia, \nresponded to the short/hard GRB 071112B (Swift trigger 296503; Perri et \nal., GCN 7058), producing images beginning 6.8 s after the GCN notice \ntime. An automated response took the first image at 18:23:55.8 UT, 24.3 \ns after the burst, under fair conditions. We took 10 5-sec, and 10 \n20-sec exposures before ROTSE-IIIc repointed at Swift trigger 296504 \n(GRB071111C). These unfiltered images are calibrated relative to USNO \nA2.0 (R).\n\nComparison to the DSS (second epoch) reveals no new sources within the \n3-sigma Swift/BAT error circle, for both single images and coadding into \nsets of 10. Individual images have limiting magnitudes ranging from \n15.3-16.3; we set the following specific limits.\n\nstart UT       end UT      t_exp(s)   mlim   t_start-tGRB(s)  Coadd?\n--------------------------------------------------------------------\n18:23:55.8   18:24:00.8         5     15.5           24.3       N\n18:23:55.8   18:25:45.1       109     16.6           24.3       Y\n18:25:53.0   18:31:02.2       309     17.3          141.5       Y",
  "circularId": 7060,
  "createdOn": 1194895132000,
  "email": "erykoff@physics.ucsb.edu",
  "subject": "GRB 071112B: ROTSE-III Rapid Optical Limits",
  "submitter": "Eli Rykoff at UCSB  <erykoff@physics.ucsb.edu>",
  "eventId": "GRB 071112B"
}