{
  "bibcode": "2026GCN.44157....1L",
  "eventId": "GRB 260330B",
  "submittedHow": "web",
  "subject": "GRB 260330B: SVOM detection of a burst",
  "createdOn": 1774882252860,
  "submitter": "SVOM_group <svomgroup@bao.ac.cn>",
  "body": "\nG. X. Lan, S. Guillot, H. Yang, O. Godet (IRAP), report on behalf of the SVOM mission team:\n\nAt 2026-03-30T14:19:57 UTC (T0), SVOM/ECLAIRs triggered and located the gamma-ray burst GRB 260330B (SVOM burst-id sb26033003).\n\nThe following trigger information was received on the ground with low latency by the SVOM VHF Alert Network.\n\nThe burst was detected both by the Count-Rate Trigger (CRT) and the Image Trigger (IMT), which produced a sequence of 9 alerts. IMT provided the alert with the best signal-to-noise-ratio in the image (SNR) of 12.13 in the [5-20] keV energy band over a time window of 40.96 seconds starting at 2026-03-30T14:19:31.\n\nThe localization of the best alert is R.A., Dec. 252.555, 36.862 degrees:\nR.A. (J2000) = 16h50m13s\nDec. (J2000) = 36d51m44s\nwith a 90% confidence level (C.L.) radius of 6.66 arcmin (including systematic error of 2 arcmin added in quadrature).\n\nThe SVOM/ECLAIRs light curve showed multiple broad peak structures with a T90 duration of about 20.844 (-3.025 / +7.55) s.\n\nThis burst was also detected by SVOM/GRM with a significance of 9.10.\nSVOM slewed to the burst.\n\nNo X-ray observation could be performed by SVOM/MXT for the time being.\nNo optical observation could be performed by SVOM/VT for the time being.\n\nThe Space-based multi-band astronomical Variable Objects Monitor (SVOM) is a China-France joint mission led by the Chinese National Space Administration (CNSA), French Space Agency (CNES), and the Chinese Academy of Sciences (CAS), which is dedicated to observing gamma-ray bursts and other transient phenomena in the energetic universe. SVOM/ECLAIRs was developed jointly by CNES, CEA-IRFU, CNRS-IRAP, CNRS-APC. SVOM/GRM was developed by the Institute of High Energy Physics (IHEP) of CAS. SVOM/MXT was developed jointly by CNES, CEA-IRFU, CNRS-IJCLab, University of Leicester, MPE.\n\nThe Burst Advocate (BA) on shift for this alert is Guangxuan Lan: glan@irap.omp.eu.\nPlease contact the BA by email if you require additional information.\n",
  "circularId": 44157,
  "format": "text/plain"
}