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 11951

Konus-Wind observation of GRB 110420A
2011-04-21T13:41:09Z (13 years ago)
Valentin Pal'shin at Ioffe Inst <>
S. Golenetskii, R.Aptekar, E. Mazets, V. Pal'shin, D. Frederiks,
P. Oleynik, M. Ulanov, D. Svinkin, and
T. Cline on behalf of the Konus-Wind team, report:

The long soft GRB 110420A (Swift-BAT trigger #451757: Mangano et al., 
GCN 11941; Krimm et al., GCN 11945) triggered Konus-Wind at 
T0(KW)=39750.543 s UT (11:02:30.543).

The burst light curve shows a single pulse started at ~T0(KW)-9 s with a 
duration of ~18 s.

As observed by Konus-Wind the burst
had a fluence of 6.54(-0.53, +0.64)x10^-6 erg/cm2,
and a 256-ms peak flux measured from T0-0.320 s
of (1.11 +/- 0.17)x10^-6 erg/cm2/s
(both in the 20 - 500 keV energy range).

The time-integrated spectrum of the burst
(from T0 to T0+8.448 s) is well fitted (in the 20 - 500 keV
range) by a power law with exponential cutoff model:
dN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep)
with alpha = -1.71(-0.26, +0.31),
and Ep = 43(-18, +17) keV (chi2 = 31.1/39 dof).
Fitting by GRB (Band) model yields the same alpha and Ep,
and an upper limit on the high energy
photon index: beta < -2.61 (chi2 = 31.1/38 dof).

All the quoted errors are at the 90% confidence level.

The Konus-Wind light curve of this GRB is available
Looking for U.S. government information and services? Visit