GCN Circular 12699
Subject
GRB 111205A: Confirmation of X-ray Afterglow
Date
2011-12-16T22:33:55Z (12 years ago)
From
Erik Hoversten at Swift/Penn State <hoversten@astro.psu.edu>
E. A. Hoversten (PSU) and C. A. Wolf (PSU) report on behalf of the
Swift team:
We have analyzed 8.3 ks of XRT data for the IPN detected burst GRB
111205A (Hurley et al. GCN Circ. 12626) from 828 to 853 ks after the
burst. The data are entirely in Photon Counting (PC) mode.
Previously an uncataloged X-ray source was detected by XRT 200 ks
after the burst (Wolf & Hoversten GCN Circ. 12630) which was
identified as the potential afterglow for GRB 111205A, but could not
be confirmed as it was not possible to discern if the source was
fading in a single observation. The follow-up observation reveals
that the source is still detected, but has faded by a factor of 4,
which corresponds to a decay index of 1.0 (+1.3, -0.6) which is
consistent with a GRB late time afterglow. Thus we conclude that the
X-ray source previously reported is the afterglow.