GCN Circular 8612
Subject
Swift-XRT observations of GRB 081203B
Event
Date
2008-12-04T16:44:11Z (17 years ago)
From
Boris Sbarufatti at INAF-IASF-Pa <sbarufatti@ifc.inaf.it>
B. Sbarufatti, V. La Parola, V. Mangano (INAF IASF-Pa) report on
behalf of the Swift-XRT team.
We report on Swift-XRT observations of GRB 081203B (Copete et al. GCN
Circ. 8600,8602). We analyzed 3.2 ks of Photon Counting mode data for
this burst, covering times from T+17 ks to T+ 47 ks. The source
reported in Sbarufatti et al. (GCN Circ. 8605) and confirmed as the
afterglow by Schady et al. (GCN Circ. 8606) is fading following a
power-law decay with index alpha=-1.4 (+0.2/-0.1).
The spectrum for the first data sequence, corresponding to a 1.96 ks
exposure and covering times from T+17 ks to T+23 ks can be fit by a
power-law with photon index 2.1+/-0.2, with an absorbing column of
(7.4+/-0.2)E20 cm**-2, in excess with respect to the galactic value
of 1.94E20 cm**-2 (Kalberla et al. 2005). The observed (unabsorbed)
flux is 1.7 (2.2)E-11 erg cm**-2 s**-1. The count-rate-to-flux
conversion factor is (4.3+/-0.1)E-11.
All quoted errors are at 90% confidence level.
This circular is an official product of the Swift-XRT team.