[vsnet-grb-info 18714] IceCube-161103: CALET Gamma-Ray Burst Monitor upper limits

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  20162
SUBJECT: IceCube-161103: CALET Gamma-Ray Burst Monitor upper limits
DATE:    16/11/10 00:32:06 GMT
FROM:    Takanori Sakamoto at AGU  <tsakamoto at phys.aoyama.ac.jp>

Y. Kawakubo, A. Yoshida, T. Sakamoto, M. Moriyama, Y. Yamada (AGU),
K. Yamaoka (Nagoya U), S. Nakahira (JAXA), I. Takahashi (IPMU),
Y. Asaoka, S. Ozawa, S. Torii (Waseda U), Y. Shimizu, T. Tamura (Kanagawa U),
W. Ishizaki (ICRR), M. L. Cherry (LSU), S. Ricciarini (U of Florence),
P. S. Marrocchesi (U of Siena)
and the CALET collaboration:

We have performed a search for an X-ray and a gamma-ray counterpart
using the CALET Gamma-ray Burst Monitor (CGBM) data around the on-set
of the very-high-energy neutrino candidate IceCube-161103A
(Taboada, GCN Circ. 20119).  The position of the IceCube event at the
event time was at the edge of the field of view of HXM (the incident angle
was 53 deg), but well inside the field of view of SGM (the incident angle was 43 deg).

No CGBM on-board trigger happened around the IceCube event time.  By using
the CGBM SGM time-history data (0.125 s time resolution), we found no significant
signal between +-30 s from the IceCube event time.  We estimate 7-sigma upper
limit of SGM in the 50-1000 keV band as 5 x 10^-7 erg cm^-2 s^-1 assuming a
single power-law model with a photon index of -2 in 1 s exposure.

All the quoted values are preliminary and subject to change by a further
analysis.

The CALET data used in this analysis are provided by the Waseda
CALET Operation Center located at the Waseda University.