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 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.