{
  "bibcode": "2008GCN..8049....1L",
  "body": "A.J. Levan (U. Warwick) and K. Wiersema (U. Leicester) report for\na larger collaboration:\n\nWe observed the location of GRB 080727B (Immler et al. GCN 8022)\nusing UKIRT. The automatic observations begin at 08:27:13 UT, roughly\n800 seconds after the burst. An initial set of K-band observations\nwere acquired, followed by a shallower JHK sequence. At the location\nof the X-ray (Goad et al. GCN 8026) and optical/IR afterglows\n(D'Avanzo et al. GCN 8023; Li et al. GCN 8024) we clearly identify\nthe fading afterglow of GRB080727B in all filters. The photometry,\ncalibrated against several 2MASS stars within the field of view is\nshown below:\n\n===========================================\nT_s T_s-T_b     Band    Mag     err\n===========================================\n08:27:13 0.00959        K       13.952 0.03\n08:31:38 0.01266        K       14.243 0.03\n08:36:03 0.01573        K       14.392 0.03\n08:50:08 0.02551        K       14.952 0.05\n09:00:10 0.03248        K       15.276 0.05\n09:10:09 0.03940        K       15.549 0.05\n===========================================\n08:47:04 0.023389       H       16.144 0.06\n08:58:06 0.031042       H       16.560 0.06\n09:07:05 0.037280       H       16.775 0.08\n==========================================\n08:43:13 0.02071        J       17.855 0.10\n08:53:15 0.02767        J       18.300 0.10\n09:03:16 0.03463        J       18.626 0.11\n===========================================\n*Data have not been corrected for the significant foreground\nextinciton\n\nThe K-band is suggestive of a break occurring at t_b ~ 1600s, with\npre- and post-break slopes of alpha_1 =0.84 and alpha_2 =1.26. The\ninitial slope is significantly shallower than that suggested by the\nKAIT observations (Li et al GCN 8046), and implies either that the\nafterglow decay flatenned after those observations, or that the\noptical and IR were not tracking eachother in this case.\n\nWe thank the staff of UKIRT for their rapid response to these alerts.",
  "circularId": 8049,
  "createdOn": 1217344500000,
  "email": "anl@star.le.ac.uk",
  "subject": "GRB 080727B: IR photometry",
  "submitter": "Andrew Levan at U.of Leicester  <anl@star.le.ac.uk>",
  "eventId": "GRB 080727B"
}