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 17808

Konus-Wind observation of GRB 150510A
2015-05-11T17:23:27Z (9 years ago)
Dmitry Frederiks at Ioffe Institute <>
S. Golenetskii, R.Aptekar, D. Frederiks, V. Pal'shin, P. Oleynik,
M. Ulanov, D. Svinkin, A. Tsvetkova, A.Lysenko, and T. Cline
on behalf of the Konus-Wind team, report:

The long-duration, hard-spectrum, intense GRB 150510A
(Fermi-LAT detection: Vianello & Racusin, GCN 17805;
Racusin et al., GCN 17806;
Fermi-GBM detection: Burns & Meegan GCN 17807)
triggered Konus-Wind at T0=11988.505 s UT (03:19:48.505).

The KW light curve shows a FRED-like structure with
a duration of ~62 s.
The emission is visible up to ~15 MeV.

The Konus-Wind light curve of this GRB is available at

As observed by Konus-Wind, the burst had a fluence
of 1.9(-0.1,+0.1)x10^-4 erg/cm2, and a 64-ms peak flux,
measured from T0+0.064 s, of 4.0(-0.3,+0.3)x10^-5 erg/cm2/s
(both in the 20 keV - 10 MeV energy range).

The time-averaged spectrum (measured from T0 to T0+39.168 s)
is best fit in the 20 keV - 15 MeV range
by the GRB (Band) function with the following model parameters:
the low-energy photon index alpha = -0.99 (-0.04,+0.05),
the high energy photon index beta = -2.81 (-1.10,+0.37),
the peak energy Ep = 1253 (-129,+134) keV,
chi2 = 106/95 dof.

The spectrum near the peak count rate
(measured from T0 to T0+6.400 s)
is best fit in the 20 keV - 15 MeV range
by the cutoff power law with the following model parameters:
the photon index alpha = -0.74(-0.05,+0.05),
and the peak energy Ep = 1320(-85,+93) keV,
chi2 = 100/87 dof.
Fitting this spectrum with the Band model yields the same
values of alpha and Ep with an upper limit on the high-energy
photon index beta of -2.9

All the quoted errors are at the 90% confidence level.
All the quoted values are preliminary.
Looking for U.S. government information and services? Visit