[vsnet-grb-info 19027] GRB 170131A detected in Swift/BAT ground processing
GCN Circulars
gcncirc at capella2.gsfc.nasa.gov
Thu Feb 2 04:19:37 JST 2017
TITLE: GCN CIRCULAR
NUMBER: 20570
SUBJECT: GRB 170131A detected in Swift/BAT ground processing
DATE: 17/02/01 19:19:04 GMT
FROM: David Palmer at LANL <palmer at lanl.gov>
GRB 170131A detected in Swift/BAT ground processing
David Palmer (LANL), on behalf of the Swift team, reports:
At 23:15:13 UT on 2017-01-31, the Swift Burst Alert Telescope (BAT)
detected a marginal peak in a rate-triggered image (Swift Trigger #736107).
Because it was below the image significance threshold, it did not yield a GRB
follow-up. However, ground analysis shows that it is at the same location
as a Fermi/GBM trigger (#507597304). KONUS/WIND also reported a trigger
at the same time.
The BAT on-board calculated location is
RA, Dec 341.447, 64.006, which is
RA(J2000) = 22h 45m 55s
Dec(J2000) = +64d 00' 22"
with an uncertainty of 3 arcmin (radius, 90% containment, including
systematic uncertainty). The BAT light curve shows a ~30 s long
FRED structure starting at ~T-20 (consistent with the Fermi/GBM
trigger time) superimposed with a ~5 second peak near the BAT
trigger time. The peak count rate was ~3000 counts/sec (15-350 keV),
at ~3 sec after the BAT trigger.
A Swift ToO observation has been scheduled.
More information about the vsnet-grb-info
mailing list