[vsnet-grb-info 18329] IceCube-160731A: Konus-Wind limits

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  19777
SUBJECT: IceCube-160731A: Konus-Wind limits
DATE:    16/08/05 15:52:16 GMT
FROM:    Dmitry Frederiks at Ioffe Institute  <fred at mail.ioffe.ru>

D. Frederiks, S. Golenetskii, R.Aptekar, P. Oleynik, M. Ulanov,
D. Svinkin, A. Tsvetkova, A.Lysenko, A. Kozlova, 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-
160731A (http://gcn.gsfc.nasa.gov/notices_amon/6888376_128290.amon)

No triggered KW event happened from ~5 days before to ~1 day after
the IceCube event. The nearest KW triggers are GRB 160726A
(Frederiks et al, GCN 19733) and GRB 160802A (Kozlova et al, GCN 19767)

Using Konus-Wind waiting mode data in the interval ±1000 s around the
IceCube trigger (July 31, 2016, 1:55:04 UTC), we estimate an upper
limit (90% conf.) on the 20 – 1200 keV fluence to ~7.7x10^-7 erg/cm^2
for a burst with duration less than 2.944 s and with a typical
KW short GRB spectrum (an exponentially cut off power law with
alpha
=-0.5 and Ep=500 keV, Svinkin et al. 2016).
For a typical long GRB spectrum (the Band function with alpha=-1,
beta=-2.5, and Ep=250 keV), the corresponding limiting peak flux
is ~5.8x10^-7 erg/cm^2/s (20 – 1200 keV, 2.944 s scale).

A plot of the KW waiting mode data can be found at
http://www.ioffe.ru/LEA/IceCube/kw20160731_06904_bg.png


All the quoted values are preliminary.