{
  "bibcode": "2013GCN.15592....1G",
  "body": "Dirk Grupe (PSU) and Alice Breeveld (MSSL) report on behalf of the \nSwift team:\n\nWe report on Swift observations of the field of the FERMI/LAT-\ndiscovered GRB 131209A (Vianello et al., GCN circ. 15587) starting\n26.5 hours after the FERMI/LAT trigger. Swift  performed three \nobservations with and exposure tome of 3 ks each to cover most of \nthe IPN error box reported by Hurley et al. (GCN circ. 15588). \nWe found two X-ray sources with in the IPN error box, one \nof which coincides with a radio source, NVSS J090753-333724. The\nsecond source at the position \n \nRA-2000:   09 07 19.2 \nDec-2000: -33 51 20.0\n\ndoes not have an entry in the NED or Simbad. Its count rate in the\nXRT is at a level of (4.7+/-1.9)e-3 counts/s which is equivalent to\na flux in the 0.3-10 keV band of (1.9+/-0.7)e-13 erg/s/cm2.\nSwift started observing the tile that covered this source 33 hours\nafter the Fermi/LAT trigger (Vianello et al., GCN Circ. 15587). \n\nOnly one of the XRT potential candidate \nsources (source 2) is in the field of view of the UVOT and there \nis no new source found at this position. Preliminary 3-sigma upper \nlimits using the UVOT photometric system (Breeveld et al. 2011, \nAIP Conf. Proc. 1358, 373) for the initial summed exposures are:\n\nFilter       T_start(hrs)   T_stop(hrs)   Exp(s)         Mag\n\nwhite        33.16          33.37          754         >21.8\nv            33.37          33.60          801         >20.1\nu            32.94          34.78         1367         >21.1\n\nThe magnitudes in the table are not corrected for the Galactic \nextinction due to the reddening of E(B-V) = 0.36 in the direction \nof the burst (Schlegel et al. 1998).",
  "circularId": 15592,
  "createdOn": 1386779287000,
  "email": "dxg35@psu.edu",
  "subject": "GRB 131209A: Swift XRT and UVOT observations",
  "submitter": "Dirk Grupe at PSU/Swift-XRT  <dxg35@psu.edu>",
  "eventId": "GRB 131209A"
}