{
  "bibcode": "2006GCN..5034....1H",
  "body": "J. P. Halpern (Columbia U.) and N. Mirabal (U. Michigan) report:\n\n\"We observed the optical afterglow (Price et al. GCN 5019; Li et al. GCN 5027)\nof Swift GRB 060428B (Campana et al. GCN 5017) in the R band on the MDM 1.3m\ntelescope during the period April 29.15-29.49 UT, or 18.6-26.8 hours after\nthe burst. The fading noted by Abe et al. (GCN 5021) has continued.  We\nestimate R~22.5 at 24 hours post-burst based on calibration with Landolt\nstandard stars.  We note that all of the objects within 25\" of the transient\nappear to be galaxies, including one having R=19.4 that is only 3\" to the\neast.\n\nA combined image of 1 hour total exposure at 24 hours post-burst is available\nat\n\nhttp://www.astro.columbia.edu/~jules/grb/060428b/mdm.jpg\n\nThis message may be cited.\"",
  "circularId": 5034,
  "createdOn": 1146312499000,
  "email": "jules@astro.columbia.edu",
  "subject": "GRB 060428B: MDM Observations",
  "submitter": "Jules Halpern at Columbia U.  <jules@astro.columbia.edu>",
  "eventId": "GRB 060428B"
}