{
  "submitter": "Diego Gotz at CEA <diego.gotz@cea.fr>",
  "format": "text/plain",
  "subject": "GRB 260510C: SVOM detection of a burst",
  "eventId": "GRB 260510C",
  "body": "\nD. Gotz (CEA/Irfu), A. Saccardi (CEA/Irfu), S. Schanne (CEA/Irfu), N. Dagoneau (CEA/Irfu) report on behalf of the SVOM mission team:\n\nAt 2026-05-10T17:13:44 UTC (T0), SVOM/ECLAIRs triggered and located the gamma-ray burst GRB 260510C (SVOM burst-id sb26051004), also detected by Fermi/GBM (Fermi GRB Team, GCN #44520).\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 11 alerts. CRT provided the alert with the best signal-to-noise-ratio in the image (SNR) of 12.18 in the [8-120] keV energy band over a time window of 10.20 seconds starting at 2026-05-10T17:13:38.\n\nThe localization of the best alert is R.A., Dec. 157.9595, 2.8711 degrees (J2000) with a 90% confidence level (C.L.) radius of 6.63 arcmin (including systematic error of 2 arcmin added in quadrature).\n\nThe SVOM/ECLAIRs light curve showed a double peaked structure with a total duration of about 150 s.\n\nThis burst was also detected by SVOM/GRM with a significance of 7.50.\nThe SVOM/GRM light curve showed two separated peaks with a total duration of about 150 s.\n\nSVOM slewed to the burst.\n\nSVOM/MXT began observing the field at 2026-05-10T17:16:44 UTC, 179 seconds after T0. Using onboard processed data we found an uncatalogued X-ray source located at R.A., Dec. 157.941, +2.820 degrees:\nR.A. (J2000) = 10h31m45.8s\nDec. (J2000) = 02d49m12.0s\nwith a 90% C.L. radius of 45 arcseconds.\n\nThis location is 3.26 arcminutes from the ECLAIRs onboard position. This position may be improved as more data is received.\n\nVT began observing the field after the slew. The analysis of the data will be published in a future circular.\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 Andrea Saccardi: andrea.saccardi@cea.fr.\nPlease contact the BA by email if you require additional information.\n",
  "circularId": 44521,
  "createdOn": 1778434971033,
  "submittedHow": "web"
}