{
  "bibcode": "2025GCN.42376....1N",
  "format": "text/plain",
  "subject": "GRB 250911A: MAXI/GSC detection",
  "body": "H. Negoro (Nihon U.), T. Mihara (RIKEN), M. Serino (AGU), M. Nakajima, K. Takagi,\nH. Takahashi, H. Nishio (Nihon U.),  T. Tamagawa, N. Kawai, M. Matsuoka (RIKEN),\nT. Sakamoto, S. Sugita, Y. Kawakubo, H. Hiramatsu, Y. Kondo, A. Yoshida (AGU),\nY. Tsuboi, H. Sugai, N. Nagashima, Y. Ishihara (Chuo U.), M. Shidatsu, C. Kang,\nT. Nakamoto, M. Uenishi, T. Usuki, S. Yatsuzuka (Ehime U.),\nI. Takahashi, Y. Yatsu (Science Tokyo), S. Nakahira, S. Ueno, H. Tomida, M. Ishikawa,\nS. Ogawa, M. Kurihara (JAXA), Y. Ueda, K. Fujiwara (Kyoto U.), M. Yamauchi, M. Nishio,\nC. Hiraizumi (Miyazaki U.), K. Yamaoka (Nagoya U.), M. Sugizaki (Kanazawa U.),\nW. Iwakiri (Chiba U.), T. Kawamuro (Osaka U.), and S. Yamada (Tohoku U),\n\nWe report on the detection of GRB 250911A by MAXI \n(Swift-BAT: GCN 41781, 41812, COLIBRI: GCN 41782, Swift-XRT: GCN 41783, 41784, 41804, \nSwift-UVOT: 41800, MASTER: GCN 41806, GECAM-B: GCN 41813, Insight-HXMT: GCN 41827, \nKonus-Wind: GCN 41939).\n\nMAXI detected the burst for approximately 40 seconds, centered at around 01:29:46 on\nSeptember 11, 2025. The period coincides with the main peak of the burst detected by Swift,\nHXMT, and Konus-Wind. The 4-10 keV X-ray flux averaged over the scan was 2041 ± 83 mCrab.\n\nThe MAXI light curve is shown at\nhttps://maxi.riken.jp/grbs/250911a/\n\nGRB 250911A was about 0.8 degrees away from the bright NS-LMXB GX 9+9. \nDue to the X-ray photon confusion from GX 9+9, we were unable to obtain firm upper \nlimits or flux in the previous transit at 23:57 UT on September 10 and the next transit \nat 03:02 UT. \nSome software problem during the burst partly causes the late notice.",
  "submitter": "Hitoshi Negoro at Nihon University/MAXI team <negoro.hitoshi@nihon-u.ac.jp>",
  "createdOn": 1761110570892,
  "submittedHow": "web",
  "circularId": 42376,
  "eventId": "GRB 250911A"
}