{
  "bibcode": "2004GCN..2915....1R",
  "body": "E. Rykoff (U. Michigan) reports on behalf of the ROTSE collaboration:\n\nROTSE-IIIb, located at McDonald Observatory, Texas, responded to Swift \nGRB041226 (GCN #2914).  An automatic response was initiated during early \ntwilight hours.  The first usable image taken at 27 Dec. 00:46:47 UT, \n4.2 hours after the burst.  We took 300 20-s exposures.  All the images \nwere taken with >99% moon illumination.  The unfiltered images were \ncalibrated relative to USNO A2.0.  Individual images have limiting \nmagnitudes improving from 15 to 16.8 as the sky darkened.  Comparison to \nDSS (second epoch) reveals no new sources within the 3-sigma error \ncircle to a limiting magnitude of 16.1 for stacks of 10 images taken 4.2 \nhours after the burst and 17.7 for stacks of 10 images taken 5 hours \nafter the burst.",
  "circularId": 2915,
  "createdOn": 1104116550000,
  "email": "erykoff@umich.edu",
  "subject": "GRB041226: ROTSE-III Optical Observations",
  "submitter": "Eli Rykoff at U of Michigan/ROTSE  <erykoff@umich.edu>",
  "eventId": "GRB 041226"
}