{
  "bibcode": "2004GCN..2692....1S",
  "body": "Smith, D. A., Yost, S. A., & Rykoff, E. S. report on behalf of the ROTSE\ncollaboration:\n\nROTSE-IIIc at the H.E.S.S. site in Namibia responded automatically to the\nINTEGRAL wakeup alert #1972.  The first exposure began at 18:18:34.6 (UTC),\napproximately 8 s after the alert time stamp and 40 s after the burst time\nreported by Gotz & Mereghetti (GCN Circ. 2691).  The ROTSE-IIIc system\nautomatically scheduled a series of exposures: 10 five-second images, 10\ntwenty-second images, and then a long series of sixty-second exposures.  As of\nthis writing, we have analyzed 82 images, and find no evidence for any variable\nsource within the updated offline error circle that is not in the USNO A2.0\ncatalog.  We estimate our unfiltered limiting magnitude to be roughly 15.1 in\nthe first two images, and then varying between 15.7 and 16.5 for all subsequent\nimages.  The field is extremely crowded relative to the ROTSE-IIIc PSF, which\ngreatly reduces sensitivity.  Co-adding ten frames does not significantly\nimprove the upper limits.",
  "circularId": 2692,
  "createdOn": 1094247151000,
  "email": "dasmith@rotse2.physics.lsa.umich.edu",
  "subject": "ROTSE-III Rapid Response to possible GRB 040903 (INTEGRAL #1972)",
  "submitter": "Don Smith at U michigan  <dasmith@rotse2.physics.lsa.umich.edu>",
  "eventId": "GRB 040903"
}