{
  "submittedHow": "web",
  "circularId": 35137,
  "eventId": "GRB 231118B",
  "bibcode": "2023GCN.35137....1N",
  "createdOn": 1700492838220,
  "subject": "GRB 231118B: CALET Gamma-Ray Burst Monitor detection",
  "submitter": "Yuta Kawakubo at Louisiana State University <kawakubo1@lsu.edu>",
  "body": "S. Nakahira (JAXA), A. Yoshida, T. Sakamoto, S. Sugita (AGU),\nY. Kawakubo (LSU), K. Yamaoka (Nagoya U),  Y. Asaoka (ICRR),\nS. Torii, Y. Akaike, K. Kobayashi (Waseda U), Y. Shimizu, \nT. Tamura (Kanagawa U), N. Cannady (GSFC/UMBC),\nM. L. Cherry (LSU), S. Ricciarini (U of Florence),\nP. S. Marrocchesi (U of Siena),\nand the CALET collaboration:\n\nThe long GRB 231118B (Fermi GBM Final Real-time Localization: \nFermi GBM team, GCN Circ. 35111; BALROG localization: Preis \net al., GCN Circ 35112; Fermi GBM observation: de Barra et al.,\nGCN Circ 35132) triggered the CALET Gamma-ray Burst \nMonitor (CGBM) at 22:34:15.15 UTC on 18 November 2023\n(http://cgbm.calet.jp/cgbm_trigger/flight/1384381978/index.html).\nThe burst signal was seen by HXM1 and SGM detectors.  No real-time \nCGBM GCN notice was distributed about this trigger because\nthe real-time communication from the ISS was off (loss of signal).\n\nThe burst light curve shows a single pulse that starts\nat T-0.7 sec, peaks at T+2.8 sec, and ends at T+6.5 sec.\nThe T90 and T50 durations measured by the SGM data are 5.6 +/- 0.3 sec\nand 2.4 +/- 0.1 sec (40-1000 keV), respectively.\n\nThe ground-processed light curve is available at\n\nhttp://cgbm.calet.jp/cgbm_trigger/ground/1384381978\n\nThe CALET data used in this analysis are provided by\nthe Waseda CALET Operation Center located at Waseda University."
}