{
  "bibcode": "2007GCN..6126....1M",
  "body": "N. Mirabal and J. P. Halpern (Columbia U.) report\non behalf of the MDM Observatory GRB follow-up team:\n\n\"We have observed the Swift location of GRB 070223 (Vetere et al.,\nGCN 6125) with the MDM 1.3m telescope at a mean epoch\nFeb. 23, 02:18 UT (~1 hr post-burst). Inside the XRT error circle,\nwe find no new optical sources to preliminary limiting\nmagnitudes R > 20.3, I > 20.0. Observations are ongoing.\n\nThis message may be cited.\"",
  "circularId": 6126,
  "createdOn": 1172199445000,
  "email": "mirabal@astro.columbia.edu",
  "subject": "GRB 070223: MDM Observations",
  "submitter": "Nestor Mirabal at Columbia U  <mirabal@astro.columbia.edu>",
  "eventId": "GRB 070223"
}