[vsnet-grb-info 16556] Konus-Wind observation of GRB 150518A

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  17837
SUBJECT: Konus-Wind observation of  GRB 150518A
DATE:    15/05/21 11:15:33 GMT
FROM:    Dmitry Svinkin at Ioffe Institute  <svinkin at mail.ioffe.ru>

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:

At about 15 minutes before the MAXI/GSC trigger on GRB 150518A
(Kawamuro, et al., GCN Circ. 17825; T0(MAXI)=21:42:14 UT)
Konus-Wind detected in the waiting mode a burst of high X-ray/soft
gamma-ray emission which had a duration of ~250 s.

Taking in account the proximity of this burst to the MAXI/GSC trigger
and consistency of the KW ecliptic latitude response with the position
of GRB 150518A we suggest this burst is the main part of GRB 150518A.
There is a hint of emission in the KW softest energy band (20-80 keV)
around T0(MAXI).

Due to a gap in the data during the main episode we cannot accurately
estimate the burst energetics.

The K-W light curve of this burst is available at
http://www.ioffe.rssi.ru/LEA/GRBs/GRB150518A/