{
  "bibcode": "2008GCN..8384....1P",
  "body": "K.L. Page (U. Leicester) reports on behalf of the Swift-XRT team:\n\nWe have analysed the first six orbits of the XRT data obtained for GRB \n081016B (Page et al., GCN Circ. 8381). After an initial 18 seconds in \nWindowed Timing mode, the remaining 3.5 ks were collected in Photon \nCounting (PC) mode. The UVOT-enhanced position was given by Osborne et al. \nin GCN Circ. 8383.\n\nThe first orbit of data shows a decay of alpha = 1.1 +/- 0.3. However, \nafter the end of this orbit (~265 s after the trigger), the source is no \nlonger detected, indicating a break to a significantly steeper decay \noccurred.\n\nThe spectrum of the first orbit of PC data can be modelled with a \npower-law (Gamma = 1.20 +/- 0.18) absorbed at the Galactic value of NH = \n1.96x10^20 cm^-2. The upper limit on the total absorbing column is \n2.2x10^21 cm^-2. The observed (unabsorbed) flux over this time is \n2.43x10^-10 (2.48x10^-10) erg cm^-2 s^-1, corresponding to a counts to \nobserved flux conversion of 6.8x10^-11 erg cm^-2 count^-1.\n\nBecause of the lack of detection after the first orbit, we cannot \npredict the future count rate.\n\nThis is an official product of the Swift-XRT team.",
  "circularId": 8384,
  "createdOn": 1224220242000,
  "email": "kpa@star.le.ac.uk",
  "subject": "GRB 081016B: Swift-XRT Team refined Analysis",
  "submitter": "Kim Page at U.of Leicester  <kpa@star.le.ac.uk>",
  "eventId": "GRB 081016B"
}