{
  "bibcode": "2021GCN.30120....1P",
  "body": "D.M. Palmer (LANL), P.A. Evans (U. Leicester), \nN.P.M. Kuin (MSSL/UCL), and K.L. Page (U. Leicester) report on behalf of the Swift Team:\n\nAt 09:45:46 UT on 2021-06-03, the Swift Burst Alert Telescope (BAT) triggered and\nlocated an unknown burst source (trigger=1053220).  Swift slewed immediately to the\nsource.  The BAT on-board calculated location is \nRA, Dec 238.819, -54.046 which is \n  RA(J2000) = 15h 55m 17s\n  Dec(J2000) = -54d 02' 46\"\nwith an uncertainty of 3 arcmin (radius, 90% containment, including \nsystematic uncertainty).  The BAT lightcurve shows a single-bin (64 ms) \nspike with a nominal peak of 2000 counts per second. However, the BAT \ntrigger timescale was very short (8 ms) and moderately intense \n(29 sigma in count rate), indicating a very short spike emission.\n\nThe XRT began observing the field at 09:47:23.3 UT, 96.8 seconds after\nthe BAT trigger. No source was detected in the 2.5-s promptly available\nimage. We are waiting for the full dataset to detect and localise the\nXRT counterpart.\n\nUVOT took a finding chart exposure of 61 seconds with the White filter starting\n100 seconds after the BAT trigger. No credible afterglow candidate has been\nfound in the initial data products. The 2.7'x2.7' sub-image covers none of the\nXRT error circle.  The list of sources is typically complete to about 18.0 mag. \nNo correction has been made for the large expected extinction.\n\nThe fast lightcurve shape, combined with the source's location near the \nGalactic plane (lon, lat = 327.90, -0.34) leads us to the conclusion that \nthis is a new SGR, which we name Swift SGR J1555.2-5402 based on the BAT position.\n\nMore information on this source will be provided once the ground pass\ndata has been analyzed.",
  "circularId": 30120,
  "createdOn": 1622715932000,
  "email": "dmopalmer@gmail.com",
  "subject": "Swift Detection of probable new Swift SGR J1555.2-5402",
  "submitter": "David Palmer at LANL  <dmopalmer@gmail.com>"
}