GCN Circular 11316
Subject
Refined analysis shows Swift Trigger 435520 is not a GRB
Date
2010-10-03T22:14:53Z (15 years ago)
From
Scott Barthelmy at NASA/GSFC <scott@lheamail.gsfc.nasa.gov>
S. Barthelmy (GSFC), J. Kennea (PSU), and R. Margutti (INAF-OAB)
report on behalf of the Swift team:
Using the full data set (T-64 to T+240 sec) from the recent downlink,
refined ground analysis shows that the Swift-BAT trigger 435520
(Cummings, et al., Circ 11315) is due to a chance fluctuation
in the image domain. It is not a GRB, nor anything astrophysical.
Swift-XRT obtained 1.5 ks of Photon Counting (PC) mode data, from T0+160 s
to T0+1.7 ks. No source is found in the BAT error circle, with a 3-sigma
upper limit of 6.7 x 10-3 ct/sec; for a typical GRB, this would correspond
to an upper limit on the observed 0.3-10 keV flux of 3.4 x 10-13 erg cm-2 s-1.