GCN Circular 6754
Subject
GRB 070810B: XRT refined analysis
Date
2007-08-11T01:59:15Z (17 years ago)
From
Rhaana Starling at U of Leicester <rlcs1@star.le.ac.uk>
R. Starling (U. Leicester), C. Markwardt (CRESST/GSFC/UMD) and F.E.
Marshall (NASA/GSFC) report, on behalf of the Swift XRT team:
We have analysed 7.2 ks of Swift XRT photon counting mode data, beginning
70 s and ending 13.8 ks after the BAT trigger, for the short GRB 070810B
(trigger=287409; Marshall et al., GCN Circ. 6743).
We do not detect any X-ray sources at 3-sigma significance or greater
within the refined BAT error circle (Sakamoto et al., GCN Circ. 6753).
Two low significance (2-sigma) possible sources are found within the BAT
refined error circle at the following positions:
Source 1
RA (J2000) = 00h 35m 51.2s
Dec (J2000) = +08d 51' 21.3''
Source 2
RA (J2000) = 00h 35m 50.0s
Dec (J2000) = +08d 48' 45.0''
Using the Bayesian method we find that both sources have between 4 and 26
counts at the 99% confidence level.
It is not possible to determine at this stage whether or not either of
these sources are fading.
We note that Source 2 lies 1.1 arcmin from the galaxy 2MASX
J00355339+0849273 (= LEDA 1354367; RA, Dec (J2000) = 00h 35m 53.39s,
+08d 49' 27.3''), which has angular diameter approximately 0.7 x 0.3 arcmin.
This is an official product of the Swift XRT team.