[vsnet-grb-info 22948] Konus-Wind observation of GRB 190706D

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  25047
SUBJECT: Konus-Wind observation of GRB 190706D
DATE:    19/07/10 12:32:13 GMT
FROM:    Anastasia Tsvetkova at Ioffe Institute  <tsvetkova at mail.ioffe.ru>

A. Tsvetkova, S. Golenetskii, R.Aptekar, D. Frederiks,
M. Ulanov, D. Svinkin, A. Lysenko, A. Kozlova and T. Cline
on behalf of the Konus-Wind team, report:

The short-duration GRB 190706D
(IPN triangulation: Svinkin et al., GCN 25036)
triggered Konus-Wind at T0=61390.044 s UT (17:03:10.044).

The burst light curve shows a a single pulse
which starts at ~T0-0.3 s and has a total duration of ~0.5 s.
The emission is seen up to ~3 MeV.

As observed by Konus-Wind, the burst
had a fluence of 7.44 (-1.10,+1.24)x10^-7 erg/cm2,
and a 64-ms peak energy flux, measured from T0+0.082 s,
of 2.37 (-0.35,+0.40)x10^-6 erg/cm2/s
(both in the 20 keV - 10 MeV energy range).

Since the bulk of the burst emission was detected before
the trigger, the spectral analysis was performed using
the KW 3-channel light curve data.

Modeling the KW 3-channel time-integrated spectrum
(from T0-0.294 s to T0+0.172 s)
by a power law with exponential cutoff model:
dN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep)
yields alpha = -0.71 (-0.30,+0.36), and Ep = 246 (-51,+70) keV.

The Konus-Wind light curve of this GRB is available at
http://www.ioffe.ru/LEA/GRBs/GRB190706_T61390/

All the quoted errors are at the 68% confidence level.
All the quoted values are preliminary.