{
  "bibcode": "2011GCN.12349....1B",
  "body": "E. Berger, R. Chornock, J. Strader (Harvard) and L. Spitler (Swinburne)\nreport:\n\n\"We imaged the field of GRB 110915A (GCN 12335) with the FourStar near-IR\nimager mounted on the Magellan/Baade 6.5-m telescope starting on 2011 Sep\n16.155 UT (14.4 hr after the burst).  Observations were obtained in the J\nand Ks filters in good seeing (0.6\").  We do not detect any sources in\ncoincidence with the enhanced XRT position (GCN 12340) to a 3-sigma limit of\nJ>23.5 mag and Ks>23.0 mag (AB).  The X-ray flux on the same timescale\n(extrapolated from the existing XRT light curve) is F_X ~ 4e-12 cgs,\nindicating an expected near-IR brightness of J~19 mag and K~18.5 mag.  If\ndue to extinction, the required ~4.5 mag in J and Ks are suggestive of an\nunusually large A_V.\"",
  "circularId": 12349,
  "createdOn": 1316176021000,
  "email": "eberger@cfa.harvard.edu",
  "subject": "GRB 110915A: Deep Near-IR Limits from Magellan",
  "submitter": "Edo Berger at Harvard  <eberger@cfa.harvard.edu>",
  "eventId": "GRB 110915A"
}