{
  "bibcode": "2007GCN..6503....1S",
  "body": "M.C. Stroh, C. Pagani & J. Racusin report on behalf of the Swift XRT team:\n\nWe have analysed the first four orbits of XRT data of GRB 070611 (Stroh et\nal., GCN Circ. 6494) with total exposure time of 8.9 ks in Photon Counting\nmode. The calculated XRT position is RA(J2000) = 1.9927, Dec (J2000) =\n-29.7557, corresponding to:\nRA(J2000)  = 00h 07m 58.3s\nDec(J2000) = -29d 45' 20.4\"\n\nwith an uncertainty of 4.0 arcsec (radius, 90% containment). This is 6.1\narcsec from the initial XRT position, and 3.4 arcsec from the ROTSE-III\noptical candidate reported by Rykoff, et al. (GCN Circ. 6497).\n\nThe XRT light curve follows a power-law decay with index 0.83 +/- 0.27\ncontinuing through T+30 ks.\n\nThe PC spectrum can be fit with an absorbed power law with photon index of\n1.9 +/- 0.5 and column density of (5 +/- 5) E20 cm-2, consistent with the\nGalactic absorption column density (1.34E20 cm-2; Dickey & Lockman, 1990).\n\nThe absorbed (unabsorbed) 0.3-10.0 keV average flux in the T+3 ks - T+30\nks time interval is 6.056E-13 (6.825E-13) ergs cm-2 s-1.\n\nAssuming that the source continues its decay at the present rate, we\npredict an XRT count rate of 4.9E-3 counts/s at T+24 h, which corresponds\nto an absorbed (unabsorbed) flux of 2.144E-14 (2.417E-14) ergs cm-2 s-1.\n\nThis circular is an official product of the Swift XRT team.",
  "circularId": 6503,
  "createdOn": 1181585442000,
  "email": "stroh@astroh.org",
  "subject": "GRB 070611: Swift-XRT refined analysis",
  "submitter": "Michael Stroh at PSU/Swift  <stroh@astroh.org>",
  "eventId": "GRB 070611"
}