{
  "bibcode": "2006GCN..4895....1B",
  "body": "A.P. Beardmore, K.L. Page (U Leicester), J.A. Kennea, D.N. Burrows (PSU)\nand H. Ziaeepour (UCL-MSSL) report on behalf of the Swift/XRT team:\n\nWe have analysed the first two orbits of Swift XRT data on the BAT GRB\n060319 (Ziaeepour, et al., GCN 4885; Sakamato et al., GCN 4891). The\nXRT began observing in Photon Counting mode at 00:58:04UT on\n2006-03-19, 173 s after the BAT trigger. With an exposure time of 4.5ks,\nthe refined XRT position is\n\nRA(J2000)  =  11h 45m 33.8s\nDec(J2000) = +60d 00' 39.0\"\n\nwith an uncertainty of 3.6\" (90% containment). This is 2' away from\nthe centre of the refined BAT position quoted in GCN 4891 (Sakamoto et\nal.), and 1.7\" away from the initial XRT position quoted in GCN 4886\n(Kennea et al.).\n\nThe 0.3-10 keV X-ray light curve initially rises from 0.5 count/s at\nT+173s to a maximum of 2 count/s at T+265s, then shows a power-law\ndecline with a decay index of 1.02+/-0.05.\n\nThe X-ray spectrum covering the time period from T+173s to T+7.3ks is\nwell fit by an absorbed power-law with a photon index of 2.10+/-0.15\nand column density of (4.6+/-0.6)e21 cm**-2. We note the Galactic column\ndensity in the direction of the source is 1.37e20 cm**-2.  The observed\n(unabsorbed) 0.3-10 keV flux for this spectrum is 1.2e-11 (2.2e-11)\nerg/cm**2/s.\n\nAssuming the X-ray emission continues to decline at the same rate, we\npredict a 0.3-10 keV XRT count rate of 0.005 count/s at T+24hr, which\ncorresponds to an observed 0.3-10 keV flux of 2.7e-13 erg/cm**2/s.",
  "circularId": 4895,
  "createdOn": 1142764825000,
  "email": "apb@star.le.ac.uk",
  "subject": "GRB060319: Swift XRT refined analysis",
  "submitter": "Andy Beardmore at U Leicester  <apb@star.le.ac.uk>",
  "eventId": "GRB 060319"
}