{
  "bibcode": "2022GCN.31664....1T",
  "body": "E. Troja (NASA/GSFC/UMCP), C. Gronwall (PSU), J. A. Kennea (PSU),\nK. L. Page (U Leicester), D. M. Palmer (LANL),\nT. M. Parsotan (GSFC/UMBC/CRESSTII) and A. Tohuvavohu (U Toronto)\nreport on behalf of the Neil Gehrels Swift Observatory Team:\n\nContinuing the recovery from the Reaction Wheel anomaly, Swift has performed a\nfollow-up observation of GRB 220302A which occurred at 07:40:19 UT (Troja et al., \nGCN 31661). \n\nThe XRT began observing the field at 16:41:18.7 UT, 32459.3 seconds\nafter the BAT trigger. Using promptly downlinked data we find an\nuncatalogued X-ray source located at RA, Dec 301.43151, 49.38868 which\nis equivalent to:\n   RA(J2000)  = 20h 05m 43.56s\n   Dec(J2000) = +49d 23' 19.2\"\nwith an uncertainty of 4.7 arcseconds (radius, 90% containment). This\nlocation is 1.6 arcseconds from the BAT onboard position, within the\nBAT error circle. This position may be improved as more data are\nreceived; the latest position is available at\nhttps://www.swift.ac.uk/sper.  We cannot determine whether the source\nis fading at the present time. \n\nA power-law fit to a spectrum formed from promptly downlinked event\ndata gives a column density consistent with the Galactic value of 3.44\nx 10^21 cm^-2 (Willingale et al. 2013). \n\nUVOT took a finding chart exposure of 150 seconds with the White filter\nstarting 32463 seconds after the BAT trigger. No credible afterglow candidate\nhas been found in the initial data products. The 2.7'x2.7' sub-image covers\n100% of the XRT error circle. The typical 3-sigma upper limit has been about\n19.6 mag. The 8'x8' region for the list of sources generated on-board covers\n100% of the XRT error circle. The list of sources is typically complete to\nabout 18 mag. No correction has been made for the expected extinction\ncorresponding to E(B-V) of 0.216. \n\nBurst Advocate for this burst is E. Troja (nora.gsfc 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": 31664,
  "createdOn": 1646240627000,
  "email": "kimlpage1978@gmail.com",
  "subject": "GRB 220302A: Swift afterglow detection",
  "submitter": "Kim Page at U.of Leicester  <kimlpage1978@gmail.com>",
  "eventId": "GRB 220302A"
}