{
  "bibcode": "2020GCN.27526....1E",
  "body": "P.A. Evans (U. Leicester), J.A. Kennea (PSU), A. Tohuvavohu (U.\nToronto), S.D. Barthelmy (NASA/GSFC), A.P. Beardmore (U. Leicester),\nM.G. Bernardini (INAF-OAB), A.A. Breeveld (UCL-MSSL), P. Brown (TAMU),\nD.N. Burrows (PSU), S. Campana (INAF-OAB), S.B. Cenko (NASA/GSFC), G.\nCusumano (INAF-IASF PA), A. D'Ai (INAF-IASFPA), P. D'Avanzo (INAF-OAB),\nV. D'Elia(ASDC), S.W.K. Emery (UCL-MSSL), P. Giommi (ASI), C. Gronwall\n(PSU), D. Hartmann (U. Clemson), H.A. Krimm (CRESST/GSFC/USRA), N.J.\nKlingler (PSU), N.P.M. Kuin (UCL-MSSL), A.Y. Lien (GSFC/UMBC), F.E.\nMarshall (NASA/GSFC), A. Melandri (INAF-OAB), J.A. Nousek (PSU), S.R.\nOates (U. Birmingham), P.T. O'Brien (U. Leicester), J.P. Osborne (U.\nLeicester), C. Pagani (U. Leicester), K.L. Page (U.Leicester), M.J.Page\n(UCL-MSSL), D.M. Palmer (LANL), M. Perri (ASDC), J.L. Racusin\n(NASA/GSFC), B. Sbarufatti (INAF-OAB/PSU), M.H. Siegel (PSU), G.\nTagliaferri (INAF-OAB), E. Troja (NASA/GSFC/UMCP) report on behalf of\nthe Swift team:\n\nSwift has carried out 70 observations of the LVC error region for the\nGW trigger S200225q convolved with the 2MPZ catalogue (Bilicki et al.\n2014, ApJS, 210, 9), using the 'LALInference' (version 1) GW\nlocalisation map. As this is a 3D skymap, galaxy distances were taken\ninto account in selecting which ones to observe. The observations\ncurrently span from 172 ks to 224 ks after the LVC trigger, and the XRT\nhas covered 3.8 deg^2 on the sky (corrected for overlaps). This covers\n51% of the probability in the 'LALInference' (version 1) skymap, and\n51% after convolving with the 2MPZ galaxy catalogue, as described by\nEvans et al. (2016, MNRAS,  462, 1591). These pointings and associated\nmetadata have been reported to the Treasure Map (Wyatt et al., arXiv\n2001.00588; http://treasuremap.space/alerts?graceids=S200225q).\n\nWe have detected 1 X-ray source. Each source is assigned a rank of 1-4\nwhich describes how likely it is to be related to the GW trigger, with\n1 being the most likely and 4 being the least likely. The ranks are\ndescribed at https://www.swift.ac.uk/ranks.php.\n\nWe have found:\n\n  * 0 sources of rank 1\n  * 0 sources of rank 2\n  * 0 sources of rank 3\n  * 1 source of rank 4\n\n\nRANK 4 sources\n==============\n\nThese are catalogued X-ray sources, showing no signs of outburst\ncompared to previous observations, so they are not likely to be related\nto the GW trigger.\n\n| Source ID\t | RA\t\t  | Dec \t   | Err90   |\n|   S200225q_X1  | 06h 42m 40.91s | +88d 04' 42.7\" |\t9.0\" |\n\nFor all flux conversions and comparisons with catalogues and upper\nlimits from other missions, we assumed a power-law spectrum with\nNH=3x10^20 cm^-2, and photon index (Gamma)=1.7\n\nThe results of the XRT automated analysis, including details of the\nsources listed above, are online at\nhttps://www.swift.ac.uk/LVC/S200225q\n\nThis circular is an official product of the Swift XRT team.",
  "circularId": 27526,
  "createdOn": 1586524589000,
  "email": "klp5@leicester.ac.uk",
  "subject": "LIGO/Virgo S200225q: Swift XRT observations, 1 X-ray sources",
  "submitter": "Kim Page at U.of Leicester  <klp5@leicester.ac.uk>",
  "eventId": "LIGO/Virgo S200225q"
}