{
  "bibcode": "2009GCN..9847....1E",
  "body": "P.A. Evans (U. Leicester) and S.R. Oates (MSSL-UCL) report on behalf of\nthe Swift team:\n\nThe Swift-XRT observed the field of GRB 090827 (Cummings et al. GCN\nCirc. 9846), gathering 7.1 ks of Photon Counting (PC) mode data from\nT0+92 ks to T0+122 ks. Inside the BAT error circle we find a single,\nuncatalogued source at a location of RA,Dec = 18.4495, -50.8957 which is\nequivalent to:\n\nRA (J2000)  = 01h 13m 47.88s\nDec (J2000) = -50d 53' 44.0\"\n\nwith an uncertainty of 6.4 arcsec (radius, 90% condfidence).\nThere are only 14 counts detected from this source, giving it a count\nrate of (3+/-1) x 10^-3 ct/sec. It is impossible to say whether this\nsource is fading.\n\nA spectrum formed from all available data can be well fitted using an\nabsorbed power law, with a photon index of 1.6 (+0.9, -0.8) and  an\nabsorption column density consistent with the Galactic value of 1.6 x\n10^20 cm^-2 (Kalberla et al. 2005).\n\nThe Swift-UVOT began settled observations of the field 91.6 ks after the\nBAT trigger. We do not detect any source at the XRT position.\n\nThe 3-sigma upper limits for the finding chart exposure is:\n\nFilter   T_start(s)   T_stop(s)   Exp(s)  Mag (3-sigma upper limit)\n-------------------------------------------------------------\nU         91644        120333      5671        > 21.94\n-------------------------------------------------------------\n\nThe quoted upper limits have not been corrected for the expected\nGalactic extinction along the line of sight of E_(B-V) = 0.01 mag.\nAll photometry is on the UVOT photometric system described in Poole et\nal. (2008, MNRAS, 383, 627).\n\nThis circular is an official product of the Swift team.",
  "circularId": 9847,
  "createdOn": 1251538728000,
  "email": "pae9@star.le.ac.uk",
  "subject": "GRB 090827: Swift XRT and UVOT observations",
  "submitter": "Phil Evans at U of Leicester  <pae9@star.le.ac.uk>",
  "eventId": "GRB 090827"
}