{
  "createdOn": 1778603713237,
  "submitter": "GRID Student Team at Tsinghua University <grid@tsinghua.edu.cn>",
  "submittedHow": "web",
  "format": "text/plain",
  "eventId": "GRB 260511A",
  "body": "Jiahuan Zhu, Chenyu Wang, Xutao Zheng, Hao Chang, Zirui Yang report on behalf of the MASS-Cube Collaboration:\n\nMASS-Cube reports the detection of the long-duration GRB 260511A, which was also observed by Fermi/GBM (GCN #44548, #44548), SVOM (GCN #44532) and GRID. The optical counterpart was detected by TRT (GCN #44533).\n\nThe event was triggered by MASS-Cube on 2026-05-11 at 06:13:29.2 UTC. The measured burst duration (T90) in the 50-10000 keV range is approximately 9.7 +/- 2.3 seconds. The second peak is not clearly detected by MASS-Cube due to its limited sensitivity.\n\nThe MASS-Cube light curve of this event can be found at https://mirrors.tuna.tsinghua.edu.cn/GRID/data/GRID-GCN/GRB260511A/MASS_Cube_260511A_ltcv.pdf.\n\nMASS-Cube is a pathfinder for a 3D position-sensitive Compton telescope in space, currently considered the next generation of the GRID constellation in the era of multi-messenger astronomy. For more information about MASS-Cube, please refer to the following reference: https://doi.org/10.1007/s10686-024-09920-4.",
  "bibcode": "2026GCN.44584....1Z",
  "subject": "MASS-Cube (GRID 2.0) detection of GRB 260511A",
  "circularId": 44584
}