{
  "bibcode": "2006GCN..5086....1H",
  "body": "J. P. Halpern (Columbia U.) and N. Mirabal (U. Michigan) report\non behalf of the MDM Observatory GRB follow-up team:\n\n\"We took a single 60 s R-band exposure of the Swift BAT location of \nGRB 060507 (Barbier et al., GCN 5084) with the MDM 1.3m telescope\non May 7 02:57 UT, 64 minutes after the trigger.  We see no new object\nwithin the 3' error circle, or at the XRT candidate position of\nVetere et al. (GCN 5085), to a limit of approximately R=19.2.\nEvening twilight and telescope pointing constraints prevent any\nfurther observations.\n\nThis message may be cited.\"",
  "circularId": 5086,
  "createdOn": 1146973558000,
  "email": "jules@astro.columbia.edu",
  "subject": "GRB 060507: MDM Optical Upper Limit",
  "submitter": "Jules Halpern at Columbia U.  <jules@astro.columbia.edu>",
  "eventId": "GRB 060507"
}