{
  "createdOn": 1745366022899,
  "submittedHow": "web",
  "format": "text/plain",
  "submitter": "SVOM_group <svomgroup@bao.ac.cn>",
  "bibcode": "2025GCN.40213....1L",
  "body": "Yifang Liang (PMO), Ziqi Wang (GXU), Wenjin Xie (NAOC), Stephane Schanne (CEA)  report on behalf of the SVOM mission team:\n\n\nSVOM/ECLAIRs triggered on the X-ray transient labelled sb25042207 (SVOM burst-id sb25042207) starting at 2025-04-22T22:36:17 UTC (Tb).\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 1 alert. IMT provided the alert with the best signal-to-noise ratio (SNR) of 7.01 in the 5-8 keV energy band over a time window of 1310.72 seconds starting at Tb.\n\nThe localization of the best alert is R.A., Dec 194.9273, 27.7745 degrees:\nRA (J2000) = 12h59m42.56s\nDec (J2000) = 27d46m28.13s\nwith a 90% C.L. radius of 11.17 arcmin (including systematic error of 2 arcmin added in quadrature).\n\nWe notice the presence of many X-ray candidate sources inside the error region, including 2 QSOs, as well as 2 nearby AGNs including Mrk 60.\n\nSVOM did not slew to this transient because it did not exceed the slew threshold. SVOM follow-up observations will be scheduled.\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.\n\nThe Burst Advocate (BA) on shift for this transient is Yifang Liang: yfliang@pmo.ac.cn\nPlease contact the BA by email if you require additional information regarding the SVOM follow-up of this burst.\n",
  "eventId": "sb25042207",
  "circularId": 40213,
  "subject": "SVOM/sb25042207: SVOM detection of an X-ray transient"
}