{
  "bibcode": "2009GCN.10153....1B",
  "body": "E. Berger (Harvard), K. Covey (Cornell), A. A. West, J. M. Andersen \n(BU), and M. McDonald (U. Maryland, College Park) report:\n\n\"We observed the XRT error circle (GCN #10151) of the short GRB 091109b \n(GCN #10152) with IMACS on the Magellan/Baade 6.5-m telescope starting \non 2009 Nov. 10.167 UT (6.2 hours after the burst).  In a 1200-sec \nstacked R-band image we find no optical sources within the XRT error\ncircle to a 3-sigma limit of R~23 mag in comparison to several nearby \nstars in the USNO-B catalog.  We further note that the object claimed to \nbe a galaxy north-west of the XRT position (GCN #10150) appears to be \nresolved into two point sources in our image (with a seeing of about\n1.1 arcsec).\"",
  "circularId": 10153,
  "createdOn": 1257830908000,
  "email": "eberger@cfa.harvard.edu",
  "subject": "GRB 091109b:  Magellan Observations",
  "submitter": "Edo Berger at Harvard  <eberger@cfa.harvard.edu>",
  "eventId": "GRB 091109B"
}