{
  "bibcode": "2009GCN..9667....1P",
  "body": "S. B. Pandey (U Mich), S.A. Yost (College of St. Benedict), W. Zheng,\nF. Yuan (U Mich), report on behalf 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 090715A (Swift trigger 357498,  Racusin J. L., GCN 9666), producing images\nbeginning 7.1 s after the GCN notice time. An automated response took\nthe first image at 17:26:05.1 UT, 25.9 s after the burst, under fair\nconditions.\nWe took 10 5-sec and 10 20-sec exposures and imaging is ongoing.\nThese unfiltered images are calibrated relative to USNO A2.0 (R). \n\nComparison to the DSS (second epoch) reveals no new sources\nwithin the 3-sigma Swift/BAT error circle, for both single images and\ncoadding into sets of 10.\nIndividual images have limiting magnitudes ranging from 15.4-16.6; we\nset the following specific limits.\nstart UT       end UT      t_exp(s)   mlim   t_start-tGRB(s)  Coadd?\n--------------------------------------------------------------------\n17:26:05.1   17:27:21.5        76     16.8           25.9       Y\n17:27:36.4   17:32:18.5       282     17.4          117.2       Y",
  "circularId": 9667,
  "createdOn": 1247680055000,
  "email": "shashi@aries.ernet.in",
  "subject": "GRB 090715A: ROTSE-III Optical Limits",
  "submitter": "Shashi Bhushan Pandey at ARIES, INDIA  <shashi@aries.ernet.in>",
  "eventId": "GRB 090715A"
}