A. Tohuvavohu (PSU), P. A. Evans (U Leicester), J.D. Gropp (PSU),
J. A. Kennea (PSU), A. Y. Lien (GSFC/UMBC), K. L. Page (U Leicester)
and B. Sbarufatti (PSU) report on behalf of the Neil Gehrels Swift
At 07:15:39 UT, the Swift Burst Alert Telescope (BAT) triggered and
located a possible burst or a Galactic transient (trigger=831888).
Swift slewed immediately to the burst.
The BAT on-board calculated location is
RA, Dec 214.508, -62.457 which is
RA(J2000) = 14h 18m 02s
Dec(J2000) = -62d 27' 24"
with an uncertainty of 3 arcmin (radius, 90% containment, including
systematic uncertainty). The BAT light curve does not show anything
significant, as it typical for image triggers (duration is 10.4 min
in this case).
The XRT began observing the field at 07:33:44.3 UT, 1085.3 seconds
after the BAT trigger. No source was detected in 764 s of promptly
downlinked data. We are waiting for the full dataset to detect and
localise the XRT counterpart.
We note that the BAT error circle was not covered by the promptly
Because of a known bug in the onboard identification software that
affects image triggers longer than 7 minutes happening at the time of
a spacecraft slew we believe the identification with a known source
in the on-board catalog is incorrect. Since the BAT position is close
to the galactic plane (l,b = 312.76,-1.25) at the moment we cannot
confidently determine if this is a GRB or a galactic source. We are
waiting for the full dataset to properly identify the nature of this
Burst Advocate for this burst is A. Tohuvavohu (aaronb AT swift.psu.edu).
Please contact the BA by email if you require additional information
regarding Swift followup of this burst. In extremely urgent cases, after
trying the Burst Advocate, you can contact the Swift PI by phone (see
Swift TOO web site for information: http://www.swift.psu.edu/too.html.)