Skip to main content
Testing. You are viewing the public testing version of GCN. For the production version, go to
New Announcement Feature, Code of Conduct, Circular Revisions. See news and announcements

GCN Circular 10451

GRB 100224A SHB found in ground analysis of BAT data
2010-02-25T20:00:59Z (14 years ago)
Jay R. Cummings at NASA/GSFC/Swift <>
J. R. Cummings (GSFC/UMBC), H. A. Krimm (GSFC/USRA),
F. E. Marshall (NASA/GSFC), and D. M. Palmer (LANL)
report on behalf of the Swift team:

At 15:20:10 UTC, Swift-BAT rate-triggered on GRB 100224A (trigger#
413805).  No source was found on board.  A source was found in ground
analysis at RA, Dec 83.467, -7.994, which is

RA (J2000) = 05h 33m 52.1s
Dec (J2000) = -07d 59' 37"

with an estimated error of 3 arcmin (90% containment).

The burst had two main peaks, the first larger, at T+0.2 and T+0.5 sec,
the first about 0.1 sec long, the second about 0.3 sec long.

The spectrum is well fit by a simple powerlaw with a photon index of
0.98 +- 0.23.  The fluence (15-150 keV) from T+0.17 to T+0.625 sec
was 3.2 +- 2 x 10^-8 ergs/cm^2/sec (1 sigma error estimates).

Since the source was not detected onboard, there are no automated
products for this burst. Since the burst is old for a SHB, there
are currently no plans for Swift followup observations.
Looking for U.S. government information and services? Visit