TITLE: GCN CIRCULAR NUMBER: 35115 SUBJECT: GRB 231115A: Upper limit from CALET Gamma-Ray Burst Monitor DATE: 23/11/19 05:41:13 GMT FROM: Yuta Kawakubo at Louisiana State University Y. Kawakubo (LSU), A. Yoshida, T. Sakamoto, S. Sugita (AGU), K. Yamaoka (Nagoya U), S. Nakahira (JAXA), Y. Asaoka (ICRR), S. Torii, Y. Akaike, K. Kobayashi (Waseda U), Y. Shimizu, T. Tamura (Kanagawa U), N. Cannady (GSFC/UMBC), M. L. Cherry (LSU), S. Ricciarini (U of Florence), P. S. Marrocchesi (U of Siena), and the CALET collaboration: The CALET Gamma-ray Burst Monitor (CGBM) was operating at the trigger time of the short GRB 231115A T0 = 2023-11-15 15:36:21.20 UT (Fermi GCN: #35035, #35044; Integral GCN: #35037; Glowbug GCN #35045; Insight-HXMT/HE GCN #35060; Konus-Wind GCN #35062; Swift-BAT GCN #35065). No CGBM onboard trigger occurred around T0. Based on the IBAS localization, the incident angles to HXM and SGM are 79 degrees and 85 degrees, respectively (#35037). Based on the analysis of the light curve data with 0.125 sec time resolution, we found a hint of the burst emission around the trigger time in HXM2 and SGM data. However, the significance of 4.8 (HXM2) and 4.7 (SGM) sigma is below our detection criterion to the CGBM data. The five sigma upper limit of SGM for a 0.125 integration time is 3.0e-6 erg/cm^2/s (10 - 1000 keV), assuming a power-law with an exponential cutoff (alpha = 0.5, Epeak = 580 keV, reference to #35044) and the IBAS position. The CALET data used in this analysis are provided by the Waseda CALET Operation Center located at Waseda University.