GCN Circular 13841
Subject
GRB 120804A: Late-time Chandra observation
Date
2012-10-04T17:56:15Z (12 years ago)
From
David Burrows at PSU/Swift <dnburrows@gmail.com>
GRB 120804A: Late-time Chandra observation
David N. Burrows (PSU), Bin-Bin Zhang (PSU) and Eleonora Troja
(NASA/GSFC/UMCP) report:
We re-observed the field of GRB 120804A (Lien et al., GCN Circ. 13573)
with the Chandra ACIS instrument, starting on September 18, 2012
16:04:50 UT (~46 days after the GRB trigger), for a total exposure of
60 ks. The X-ray afterglow is clearly detected at the 10 sigma level.
The inferred flux is consistent with an extrapolation of
the earlier Swift XRT observations (Troja et al., GCN Circ. 13640) and the
XMM observation (Margutti et al. (GCN Circ. 13715), and shows a
continuing decline in flux with a power-law decay slope of ~1.0 and
no evidence for a jet break, consistent with Berger et al. (arXiv:1209:5423).
We thank Dan Schwartz and the entire Chandra staff for
rapidly executing this observation.