{
  "body": "\nR. Brivio (INAF-OAB), S. Dichiara (PSU), M. Ferro (INAF-OAB),\nC. Gronwall (PSU), J.D. Gropp (PSU), J. A. Kennea (PSU),\nN. J. Klingler (GSFC/UMBC/CRESSTII), A. Y. Lien (U Tampa),\nK. L. Page (U Leicester), C. Salvaggio (INAF-OAB),\nT. Sbarrato (INAF-OAB) and B. Sbarufatti (INAF-OAB) report on behalf\nof the Neil Gehrels Swift Observatory Team:\n\nAt 15:13:54 UT, the Swift Burst Alert Telescope (BAT) triggered \non 4U 1543-62 (trigger=1220736).  Swift slewed immediately to the source. \nThe BAT on-board calculated location is \nRA, Dec 236.947, -62.534 which is \n   RA(J2000) = 15h 47m 47s\n   Dec(J2000) = -62d 32' 01\"\nwith an uncertainty of 3 arcmin (radius, 90% containment, including \nsystematic uncertainty).  The BAT light curve showed a complex\nstructure with a duration of about 10 sec.  The peak count rate\nwas ~300 counts/sec (15-350 keV), at ~4 sec after the trigger. \n\nThe XRT began observing the field at 15:16:08.0 UT, 133.4 seconds after\nthe BAT trigger. XRT found a bright X-ray source located at RA, Dec\n236.9760, -62.5656 which is equivalent to:\n   RA(J2000)  = 15h 47m 54.24s\n   Dec(J2000) = -62d 33' 56.2\"\nwith an uncertainty of 4.8 arcseconds (radius, 90% containment). This\nlocation is 123 arcseconds from the BAT onboard position, within the\nBAT error circle. This position is 7.6 arcseconds from the known source \n4U 1543-62. No event data are yet available to determine the column density\nusing X-ray spectroscopy. \n\nThe initial flux in the 2.5 s image was 5.62e-09 erg cm^-2 s^-1 (0.2-10\nkeV). \n\nUVOT took a finding chart exposure of 150 seconds with the White\nfilter  starting 141 seconds after the BAT trigger. A source\nconsistent with the location of 4U 1543-62 is detected. \n\nThis source is a known Low Mass X-ray Binary, also known by the name QU TrA. \n\n",
  "subject": "Swift Trigger 1220736: detection of 4U 1543-62.",
  "bibcode": "2024GCN.36052....1B",
  "createdOn": 1712591029700,
  "submittedHow": "email",
  "submitter": "K.L. Page at U Leicester <klp5@leicester.ac.uk>",
  "circularId": 36052
}