{
  "bibcode": "2006GCN..5771....1M",
  "body": "N. Mirabal (Columbia U.), R. J. Assef &  K. Schlesinger (OSU) report on\nbehalf of the MDM Observatory GRB follow-up team:\n\n\"We observed the Swift error circle of GRB 061028 (Sakamoto et al., GCN \n5762)\nin r', i', and z' bands using the RETROCAM imager on the MDM 2.4m\ntelescope starting on October 28 06:47 UT, 5.35 hours after the trigger.\nA summed 45-minute exposure in i' reveals no new object in the refined\nXRT error circle (Cusumano et al., GCN 5767) down to I ~ 21.5 relative\nto the USNO-B1.0 catalog. We clearly detect sources S1 (Bloom et al.,\nGCN 5768) and S2 (Cenko et al., GCN 5770)  at a preliminary magnitude of\nI ~ 21.0 for both objects, consistent with the measurements reported by\nCenko et al (GCN 5770).  Results of additional bands will be reported\nsubsequently.\n\nThis message may be cited.\"",
  "circularId": 5771,
  "createdOn": 1162160152000,
  "email": "mirabal@astro.columbia.edu",
  "subject": "GRB 061028: MDM Observations",
  "submitter": "Nestor Mirabal at Columbia U  <mirabal@astro.columbia.edu>",
  "eventId": "GRB 061028"
}