Skip to main content
Testing. You are viewing the public testing version of GCN. For the production version, go to
New Announcement Feature, Code of Conduct, Circular Revisions. See news and announcements

GCN Circular 7942

GRB 080703: Swift-XRT refined analysis
2008-07-04T13:45:39Z (16 years ago)
Olivier Godet at U.of Leicester <>
We analysed 12.1 ks of data in Photon Counting (PC) mode obtained for GRB
080703 (Ziaeepour et al., GCN Circ 7936) between 106 s and 3.1e4s after the
trigger (T0). The UVOT-enhanced XRT position was given by Osborne et al. in
GCN Circ. 7939.

The X-ray light-curve shows an initial rise from T0+106s to ~T0+200s and
decays with a slope of ~1.2. From ~T0+700s to ~T0+2000s, the XRT light-curve
shows some flaring activities. The light-curve after ~T0+1e4s decays with a
slope of 1.57 +/-0.21.

The hardness ratio does not show any significant spectral variation from
T0+106s to T0+3.1e4s. The PC spectrum from T0+106s to T0+3.1e4s is well
by an absorbed power-law with a photon index of 1.7 +/-0.1 and an absorption
column of (8.9 +3.9/-3.3)e20 cm**-2, in excess with respect to the Galactic
one (5.2e20 cm**-2; Kalberla et al. 2005). The observed 0.3-10 keV flux over
this time interval is (8.2 +0.8/-1.2)e-12 erg/cm**2/s.

If the light-curve continues to decay with alpha = 1.6, the count rate at 24
hours after the trigger is estimated to be 7e-3 counts/s, which
corresponds to
an observed flux of 6.7e-13 erg/cm**2/s.

This is an official product of the Swift-XRT team.
Looking for U.S. government information and services? Visit