{
  "bibcode": "2005GCN..4364....1B",
  "body": "J. S. Bloom (UC Berkeley), on behalf of a larger collaboration, reports:\n\n\"We began observations of the bright short burst GRB 051221 (Parsons  \nGCN #4363) with the PAIRITEL 1.3m at 2005-12-21 02:54:02 UTC, about  \n30 minute after the GCN circular and 1hr3min after the GRB. In a  \nstack of the first 313sec, we detect no new sources to at least the  \n2MASS limit in JHKs bands. A visual comparison with the DSS-2 (F- \nplate) shows that most of the sources fainter than 2MASS in the  \nPAIRITEL mosaics have optical counterparts.  Some of the faintest IR  \nsources do not have detected counterparts but this is likely due to  \nthe redness/faintness of the sources. In particular, we point out  \nobjects at J2000:\n\n    A: 21:54:57.84 +16:53:07.5   (inside the error circle)\n    B: 21:55:00.89 +16:56:50.2   (red, outside the error circle)\n    C: 21:55:01.58 +16:57:07.1   (red, outside the error circle,  \nextended)\n\nFurther analysis is ongoing but we suggest that these sources be  \nmonitored for variability, especially object A.\"\n\nA RGB (=KsHJ) finding chart may be found at:\n  http://astro.berkeley.edu/~jbloom/grb051221.ps\n\nThis message may be cited.",
  "circularId": 4364,
  "createdOn": 1135140345000,
  "email": "jbloom@astron.berkeley.edu",
  "subject": "GRB 051221: IR Observations at GRB+1hr",
  "submitter": "Josh Bloom at UC Berkeley  <jbloom@astron.berkeley.edu>",
  "eventId": "GRB 051221"
}