{
  "eventId": "sb26071506",
  "format": "text/plain",
  "circularId": 45169,
  "subject": "sb26071506: SVOM detection of a X-ray transient",
  "createdOn": 1784135129603,
  "body": "Floriane Cangemi (APC), Alexis Coleiro (APC), Maria Grazia Bernardini (INAF-OAB, LUPM), Frederic Piron (LUPM), Nicolas Dagoneau (CEA), Andrea Saccardi (CEA) and Damien Turpin (CEA) report on behalf of the SVOM mission team:\n\nAt 2026-07-15T16:23:04 UTC (T0), SVOM/ECLAIRs triggered and located a X-ray transient (SVOM burst-id sb26071506).\n\nThe following trigger information was received on the ground with low latency by the SVOM VHF Alert Network.\n\nThe burst was only detected by the Image Trigger (IMT), which produced a sequence of 4 alerts. IMT provided the alert with the best signal-to-noise-ratio in the image (SNR) of 9.24 in the [5-20] keV energy band over a time window of 327.68 seconds starting at 2026-07-15T16:18:58.\n\nThe localization of the best alert is R.A., Dec. 310.3570, -32.4133 degrees (J2000) with a 90% confidence level (C.L.) radius of 8.57 arcmin (including systematic error of 2 arcmin added in quadrature).\n\nSVOM slewed to the burst.\n\nSVOM/MXT began observing the field at 2026-07-15T16:27:08 UTC, 244 seconds after T0. Using onboard processed data we found an uncatalogued X-ray source located at R.A., Dec. 310.4508, -32.4345 degrees:\nR.A. (J2000) = 20h41m48.18s\nDec. (J2000) = -32d26m04.34s\nwith a 90% C.L. radius of 29.15 arcseconds.\n\nThis location is 4.92 arcminutes from the ECLAIRs onboard position. This position may be improved as more data is received.\n\nWe note the presence of the high-proper motion star V* AT Mic in the error box of both ECLAIRs and MXT.\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 Floriane Cangemi: cangemi@apc.in2p3.fr.\nPlease contact the BA by email if you require additional information.",
  "submitter": "SVOM_group <svomgroup@bao.ac.cn>",
  "bibcode": "2026GCN.45169....1C",
  "submittedHow": "web"
}