{
  "bibcode": "2005GCN..3813....1Y",
  "body": "Fang Yuan, E.S. Rykoff (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 GRB 050815 (Swift trigger 150532), producing images \nbeginning 7.2 s after the GCN notice time. An automated response took \nthe first image at 17:25:54.2 UT, 35.5 s after the burst, under fair \nconditions. We took 10 5-sec, 10 20-sec and 130 60-sec eposures. These \nunfiltered images are calibrated relative to USNO A2.0 (R).\n\nComparison to the DSS (second epoch) reveals no new sources within the \n3-sigma error circle, for both single images and coadding into sets of \n10; however, we are limited as the field is severely crowded. \nFurthermore, we do not detect any new objects in the XRT error circle \n(Morris et al, GCN 3812). Individual images have limiting magnitudes \nranging from 14.9-15.8; we set the following specific limits.\n\nstart UT       end UT      t_exp(s)   mlim   t_start-tGRB(s)  Coadd?\n--------------------------------------------------------------------\n17:25:54.2   17:25:59.2         5     14.9           35.5       N\n17:25:54.2   17:27:25.2        91     15.8           35.5       Y\n17:27:25.9   17:32:20.9       295     16.1          127.2       Y",
  "circularId": 3813,
  "createdOn": 1124143098000,
  "email": "erykoff@umich.edu",
  "subject": "GRB 050815: ROTSE-III Optical Limits",
  "submitter": "Eli Rykoff at U of Michigan/ROTSE  <erykoff@umich.edu>",
  "eventId": "GRB 050815"
}