TITLE:   GCN CIRCULAR
NUMBER:  22281
SUBJECT: IceCube-170922A: Konus-Wind upper limits
DATE:    17/12/25 10:42:07 GMT
FROM:    Anna Kozlova at Ioffe Institute  <ann_kozlova@mail.ioffe.ru>

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

Using Konus-Wind (KW) data, we have performed a search for
a gamma-ray transient around the time of the cosmic neutrino
candidate IceCube-170922A (2017-09-22 20:54:30.43 UT,
hereafter T0; Kopper&Blaufuss, GCN 21916;
https://gcn.gsfc.nasa.gov/notices_amon/50579430_130033.amon)

No triggered KW event happened from ~1.7 days before and up to ~3.5 days
after T0. The closest waiting-mode event was ~5.5 hours after T0.
Using waiting-mode data within the interval T0  +/- 1000 s,
we found no significant (> ~5 sigma) excess over the background
in both KW detectors on temporal scales from 2.944 s to 100 s in the 
80-1000 keV band.

We estimate an upper limit (90% conf.) on the 10 keV – 10 MeV fluence
to 1.0x10^-6 erg/cm^2 for a burst lasting less than 2.944 s and having a
typical KW short GRB spectrum (an exponentially cut off power law with
alpha =-0.5 and Ep=500 keV). For a typical long GRB spectrum (the Band
function with alpha=-1, beta=-2.5, and Ep=300 keV), the corresponding
limiting peak flux is 3.1x10^-7 erg/cm^2/s (10 keV - 10 MeV, 2.944 s 
scale).

All the quoted values are preliminary.