GCN Circular 4326
Subject
GRB 051211: Swift XRT upper limit
Date
2005-12-11T19:32:52Z (18 years ago)
From
David Burrows at PSU/Swift <dxb15@psu.edu>
G. Cusumano (INAF-IASF), D.N. Burrows, S. Hunsberger, C. Pagani (PSU), V.
La Parola, and V. Mangano (INAF-IASF) report on behalf of the Swift XRT team:
The Swift XRT began observing HETE-discovered GRB 051211 (Atteia et al.,
GCN 4324) at 14:43:21 UT on 11 December 2005. In the first two orbits we
accumulated 3330 s of exposure time. We find no X-ray counterpart within
the HETE/SXC error circle, with a 3 sigma upper limit of 3.19E-3
counts/s (2.0 E-13 erg/s/cm/cm). We note that this is considerably
fainter than the typical Swift afterglow at this same time frame, though
not inconsistent with the fainter Swift afterglows (Nousek et al. 2005,
astroph/0508332). Observations will be terminated at about 19:30 UT on 11
December to prevent overheating of the XRT detector.