Skip to main content
Introducing Einstein Probe, Astro Flavored Markdown, and Notices Schema v4.0.0. See news and announcements

GCN Circular 21264

GRB 170626A: Swift detection of a burst
2017-06-26T09:53:22Z (7 years ago)
David Palmer at LANL <>
F. E. Marshall (NASA/GSFC), A. P. Beardmore (U Leicester),
A. A. Breeveld (UCL-MSSL), D. N. Burrows (PSU),
S. W. K Emery (UCL-MSSL), P. A. Evans (U Leicester),
N. P. M. Kuin (UCL-MSSL), K. L. Page (U Leicester),
D. M. Palmer (LANL) and B. Sbarufatti (INAF-OAB/PSU) report on behalf
of the Swift Team:

At 09:37:23 UT, the Swift Burst Alert Telescope (BAT) triggered and
located GRB 170626A (trigger=758766).  Swift slewed immediately to the burst. 
The BAT on-board calculated location is 
RA, Dec 165.414, +56.469 which is 
   RA(J2000) = 11h 01m 39s
   Dec(J2000) = +56d 28' 09"
with an uncertainty of 3 arcmin (radius, 90% containment, including 
systematic uncertainty).  The BAT light curve showed a multi-peaked
structure with a duration of about 15 sec.  The peak count rate
was ~35000 counts/sec (15-350 keV), at ~0 sec after the trigger. 

The XRT began observing the field at 09:38:21.6 UT, 58.5 seconds after
the BAT trigger. XRT found a bright, uncatalogued X-ray source located
at RA, Dec 165.3927, 56.4759 which is equivalent to:
   RA(J2000)  = +11h 01m 34.25s
   Dec(J2000) = +56d 28' 33.2"
with an uncertainty of 5.3 arcseconds (radius, 90% containment). This
location is 49 arcseconds from the BAT onboard position, within the BAT
error circle. No event data are yet available to determine the column
density using X-ray spectroscopy. 

The initial flux in the 2.5 s image was 1.52e-09 erg cm^-2 s^-1 (0.2-10

The XRT position is 5.4 arcmin away from a magnitude 2 star (Merak),
therefore there are no UVOT data for this burst. 

Burst Advocate for this burst is F. E. Marshall (marshall AT 
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:
Looking for U.S. government information and services? Visit