{
  "bibcode": "2008GCN..7859....1S",
  "body": "B. Sbarufatti, V. Mangano, V. La Parola (INAF-IASF Pa) report on  \nbehalf of\nthe Swift-XRT team.\n\n\nSwift-XRT began observations of the field of GRB 080607 (trigger 313417,\nMangano et al., GCN circ. 7847) on date 2008 June 07, 06:08:54 UT, 87 s\nafter the BAT trigger. The data consist of 478 s in Windowed timing mode\nand 3 ks in Photon Counting mode.\n\nThe lightcurve shows a complex behaviour. After an initial steep decay\n(index 5.8 +/- 0.4) we observe a double peaked flare, starting at\nT+ 118 (+/- 1) s and peaking at T+120 s and T+140 s. The underlying\ndecay breaks at T+ 119 (+ 5, - 2) s to a slope of 1.7 (+/- 0.1). A\nsecond break at t+700 (+/- 300) marks the beginning of a plateau phase\n(index 0.5 +/- 1.3). The lightcurve breaks again around\nT+1600 (+/- 500) s, with a final decay index of -2.0 +/- 0.5.\nThe countrate predictions for T+24h and T+48h are 2.1E-3 counts/s\nand 5.5E-4 count/s respectively.\n\nThe WT spectrum can be fit by a powerlaw with photon index 1.81 +/- 0.02\nand an intrinsic absorbing column density of (4.0 +/- 0.2)E22 cm^-2 at\nz=3.036 (Prochaska et al. GCN Circ. 7849), in excess with\nrespect to the Galactic value of 1.69E+20 cm^-2 (Kalberla et al. 2005).\nThe observed (unabsorbed) flux in the 0.3 - 10 keV band is\n2.9 (3.0)E-9 erg cm^-2 s^-1.\nThe PC spectrum can be fit by a powerlaw with photon index 2.1 +/- 0.1\nand an intrinsic absorbing column density of (4.0 +/- 0.8)E22 cm^-2 at\nz=3.036, in excess with respect to the Galactic value. The observed\n(unabsorbed) flux in the 0.3 - 10 keV band is\n5.3 (5.4)E-11 erg cm^-2 s^-1.\n\nThis circular is an official product of the Swift-XRT team.\n\n[GCN OPS NOTE(08jun08): Per author's request, the \"(4.0 +/- 0.8)E21\"\nwas changed to \"(4.0 +/- 0.8)E22\".]",
  "circularId": 7859,
  "createdOn": 1212878805000,
  "email": "sbarufatti@ifc.inaf.it",
  "subject": "GRB 080607: Swift-XRT refined analysis",
  "submitter": "Boris Sbarufatti at INAF-IASF-Pa  <sbarufatti@ifc.inaf.it>",
  "eventId": "GRB 080607"
}