{
  "bibcode": "2021GCN.29834....1M",
  "body": "M. J. Moss (GWU), V. D'Elia (SSDC & INAF-OAR), C. Gronwall (PSU),\nJ.D. Gropp (PSU), J. A. Kennea (PSU), N. J. Klingler (PSU),\nN. P. M. Kuin (UCL-MSSL), S. Laha (GSFC/UMBC/CRESST),\nA. Y. Lien (GSFC/UMBC), F. E. Marshall (NASA/GSFC), M. H. Siegel (PSU)\nand A. Tohuvavohu (U Toronto) report on behalf of the Neil Gehrels\nSwift Observatory Team:\n\nAt 23:27:49 UT, the Swift Burst Alert Telescope (BAT) triggered and\nlocated GRB 210419C (trigger=1044236).  Swift slewed immediately to the burst. \nThe BAT on-board calculated location is \nRA, Dec 212.968, 35.999 which is \n   RA(J2000) = 14h 11m 52s\n   Dec(J2000) = +35d 59' 56\"\nwith an uncertainty of 3 arcmin (radius, 90% containment, including \nsystematic uncertainty). Currently, we only have limited BAT light curve data. \nThe available light curve from ~T+110 s to ~T+400 s does\nnot show any significant structure. \n\nDue to lack of data, we do not have an accurate XRT position. However our current\nbest estimate for the GRB position is RA/Dec(J2000) = 212.96009,\n+36.0096, which is equivalent to:\n\nRA(J2000): 14h 11m 50.4s\nDec(J2000): 36d 00m 34.6s\n\nUncertainty of this position is unclear. We await ground\nprocessed data to report an accurate position for this GRB. \n\nUVOT took a finding chart exposure of ���95��� seconds with the ���U��� filter\nstarting��� around 340 ���seconds after the BAT trigger. No credible afterglow candidate has\nbeen found in the initial data products. The 2.7'x2.7' sub-image covers 100% of\nthe XRT error circle. The typical 3-sigma upper limit has been about 19.6 mag. \nThe 8'x8' region for the list of sources generated on-board covers 100% of the\nXRT error circle. The list of sources is typically complete to about 18 mag. No\ncorrection has been made for the expected extinction corresponding to E(B-V) of\n0.0���1���. \n\nBurst Advocate for this burst is M. J. Moss (mikejmoss3 AT gmail.com). \nPlease contact the BA by email if you require additional information\nregarding Swift followup of this burst. In extremely urgent cases, after\ntrying the Burst Advocate, you can contact the Swift PI by phone (see\nSwift TOO web site for information: http://www.swift.psu.edu/)",
  "circularId": 29834,
  "createdOn": 1618879540000,
  "email": "mikejmoss3@gmail.com",
  "subject": "GRB 210419C: Swift detection of a burst",
  "submitter": "Michael Moss at George Washington U  <mikejmoss3@gmail.com>",
  "eventId": "GRB 210419C"
}