{
  "submitter": "Dong Xu at NAOC/CAS <dxu@nao.cas.cn>",
  "subject": "GRB 241215A: Nanshan/HMT optical upper limit",
  "submittedHow": "web",
  "bibcode": "2024GCN.38576....1L",
  "body": "X. Liu, S.Q. Jiang, J. An, S.Y. Fu, Z.P. Zhu, D. Xu (NAOC), X. Gao (Urumqi No.1 Senior High School), J.Z. Liu (XAO) report on behalf of a large collaboration:\n\nWe observed the field of GRB241215A detected by INTEGRAL/IBIS (Mereghetti et al., GCN 38573) using the HMT-0.5m telescope located at Nanshan, Xinjiang, China. Observations started at 2024-12-15T16:09:56.00, i.e., ~  2.28 hrs after the INTEGRAL trigger and consisted of 15 x 90 s frames without any filter.\n\nNo uncatalogued optical source is detected in our stacked images within the INTEGRAL/IBIS 2.5 arcmin error circle (Mereghetti et al., GCN 38573), down to a 3 sigma upper limit of r ~ 19.8, calibrated with nearby Pan-STARRS stars and not corrected for Galactic extinction.",
  "format": "text/plain",
  "circularId": 38576,
  "eventId": "GRB 241215A",
  "createdOn": 1734312680325
}