{
  "bibcode": "2010GCN.11080....1C",
  "body": "R. Chary and J. Davies (Caltech) report:\n\nWe have imaged the field of GRB 100807A (Grupe et al., GCN 11067) with\nthe WIRC instrument on the Palomar 200 inch telescope in the J and H bands\nbeginning at 9:47 UT on 7 August (~ 35 mins after the Swift trigger). The\nfading transient reported in Cenko et al. (GCN 11073) is clearly\ndetected.  Using 2MASS stars for relative photometry, we measure the\nfollowing photometry for the object:\n\nUT (mid-point)  t_burst (min)   Filter          Magnitude\n---------------------------------------------------------------\n09:55           41              J               19.76 +/- 0.1\n10:10           56              H               19.05 +/- 0.1\n12:16           183             J               21.10 +/- 0.2\n\nThe red colors of the source compared to the optical photometry can be\nattributed to the A_V=2.5 mag of Galactic extinction in this region.\n\nA nearby object 3\" to the SE is also quite red with H=18.75+/-0.1 and\nJ-H=1.5 mag and could potentially be the host galaxy.\n\nAll magnitudes are in the Vega system.",
  "circularId": 11080,
  "createdOn": 1281538914000,
  "email": "cenko@srl.caltech.edu",
  "subject": "GRB 100807A: P200 Infrared Observations",
  "submitter": "S. Bradley Cenko at Caltech  <cenko@srl.caltech.edu>",
  "eventId": "GRB 100807A"
}