{
  "bibcode": "2006GCN..5496....1R",
  "body": "GRB 060901: Swift/XRT Refined Analysis\n\nJ. Racusin (PSU) reports on behalf of the Swift XRT team:\n\nWe have analyzed the first 4 orbits of Swift XRT observations of GRB \n060901 (Mereghetti et al., GCN Circ. 5491), with a total exposure of 3 ks. \nThe refined position is:\n\nRA(J2000): 19:08:37.93\nDec(J2000): -6:38:08.1\n\nwith an estimated uncertainty of 4.3 arcseconds (90% containment). This \nposition is 0.7 arcseconds from the preliminary XRT position given in GCN \nCirc. 5494 (Racusin et al.) and 14.5 arcseconds from the INTEGRAL position \ngiven in GCN Circ. 5491 (Mereghetti et al.).\n\nThe 0.2-10 keV light curve in Photon Counting (PC) mode starts ~14 ks \nafter the burst.  The X-ray afterglow is faint, initially 0.05 counts/s, \ndecaying with a slope of -1.7 +/- 0.7.\n\nThe preliminary spectral fit to the PC data gives a spectral power law \nphoton index of 2.1 +/- 0.6 in the [0.3-10] keV band, assuming Galactic \nabsorption (2.34e21cm^-2).  The average (in the time range 14 - 30 ks from \ntrigger) estimated unabsorbed 0.3-10 keV flux was ~2.6e-12 erg cm^-2 s^-1.\n\nThe XRT count rate extrapolated to T+24 hr is estimated to be ~0.003 \ncounts/s, corresponding to an unabsorbed 0.3-10 keV flux of about 4.4e-13 \nerg cm^-2 s^-1.\n\nThis circular is an official product of the Swift XRT Team.",
  "circularId": 5496,
  "createdOn": 1157203823000,
  "email": "racusin@astro.psu.edu",
  "subject": "GRB 060901: Swift/XRT Refined Analysis",
  "submitter": "Judith Racusin at PSU  <racusin@astro.psu.edu>",
  "eventId": "GRB 060901"
}