{
  "bibcode": "2008GCN..8612....1S",
  "body": "B. Sbarufatti, V. La Parola, V. Mangano (INAF IASF-Pa) report on  \nbehalf of the Swift-XRT team.\n\nWe report on Swift-XRT observations of GRB 081203B (Copete et al. GCN  \nCirc. 8600,8602). We analyzed 3.2 ks of Photon Counting mode data for  \nthis burst, covering times from T+17 ks to T+ 47 ks. The source  \nreported in Sbarufatti et al. (GCN Circ. 8605) and confirmed as the  \nafterglow by Schady et al. (GCN Circ. 8606) is fading following a  \npower-law decay with index alpha=-1.4 (+0.2/-0.1).\n\nThe spectrum for the first data sequence, corresponding to a 1.96 ks  \nexposure and covering times from T+17 ks to T+23 ks can be fit by a  \npower-law with photon index 2.1+/-0.2, with an absorbing column of  \n(7.4+/-0.2)E20 cm**-2, in excess with respect to the galactic value  \nof 1.94E20 cm**-2 (Kalberla et al. 2005). The observed (unabsorbed)  \nflux is 1.7 (2.2)E-11 erg cm**-2 s**-1. The count-rate-to-flux  \nconversion factor is (4.3+/-0.1)E-11.\n\nAll quoted errors are at 90% confidence level.\n\nThis circular is an official product of the Swift-XRT team.",
  "circularId": 8612,
  "createdOn": 1228409051000,
  "email": "sbarufatti@ifc.inaf.it",
  "subject": "Swift-XRT observations of GRB 081203B",
  "submitter": "Boris Sbarufatti at INAF-IASF-Pa  <sbarufatti@ifc.inaf.it>",
  "eventId": "GRB 081203B"
}