{
  "bibcode": "2007GCN..6526....1M",
  "body": "N. Mirabal, I. D. McGreer, J. P. Halpern (Columbia U.),\nM. Dietrich, B. M. Peterson (Ohio State U.) report on\nbehalf of the MDM GRB follow-up team:\n\n\"We observed the candidate optical afterglow of Swift\nGRB 070612A (Updike et al. GCN 6515, Cenko et al.\nGCN 6525) using the MDM 2.4m telescope. Preliminary\ncalibration with respect to USNO magnitudes\nof nearby stars yields r' ~ 19.0 +/- 0.3 on June 13 03:59 UT\nand i' ~ 18.4 +/- 0.2 on June 13 03:49 UT respectively.\nThese measurements indicate that the afterglow\nhas faded with respect to previous reports.\"",
  "circularId": 6526,
  "createdOn": 1181709508000,
  "email": "mirabal@astro.columbia.edu",
  "subject": "GRB 070612A: MDM Observations",
  "submitter": "Nestor Mirabal at Columbia U  <mirabal@astro.columbia.edu>",
  "eventId": "GRB 070612A"
}