{
  "bibcode": "2019GCN.24353....1T",
  "body": "A. Tohuvavohu (PSU), P.A. Evans (U. Leicester), J.A. Kennea (PSU),\nS.B. Cenko (NASA/GSFC), S.D. Barthelmy (NASA/GSFC), A.P. Beardmore (U.\nLeicester), A.A. Breeveld (UCL-MSSL), D.N. Burrows (PSU), S. Campana\n(INAF-OAB), G. Cusumano (INAF-IASF PA),  A. D'Ai (INAF-IASFPA), P.\nD'Avanzo (INAF-OAB), V.D'Elia(ASDC), S.W.K. Emery (UCL-MSSL),  P.\nGiommi (ASI), C. Gronwall (PSU), D. Hartmann (U. Clemson), N. J.\nKlingler (PSU), H.A. Krimm (CRESST/GSFC/USRA), N.P.M. Kuin (UCL-MSSL),\nA.Y. Lien (GSFC/UMBC), D. Malesani (DARK/NBI), F.E. Marshall\n(NASA/GSFC), A. Melandri (INAF-OAB), J.A. Nousek (PSU), S.R. Oates (U.\nWarwick), P.T. O'Brien (U. Leicester), J.P. Osborne (U. Leicester), C.\nPagani (U. Leicester), K.L. Page (U.Leicester), D.M. Palmer (LANL), M.\nPerri (ASDC), J.L. Racusin (NASA/GSFC), B. Sbarufatti (INAF-OAB/PSU),\nM.H. Siegel (PSU), G. Tagliaferri (INAF-OAB), E. Troja\n(NASA/GSFC/UMCP) report on behalf of the Swift team:\n\nThe Neil Gehrels Swift Observatory UVOT and XRT instruments began pointed\ngalaxy-targeted followup of the LIGO/Virgo detected S190425z (LVC GCN. 24168)\nat 2019-04-25 12:53 UT (T0+274 min), delayed due to a commanding gap.\nThe observations continued until 2019-04-26 20:15 UT, when they were aborted\nto begin followup of S190426c (LVC GCN. 24237).\n\nThe completed campaign comprised ~400 fields, covering several hundred\nof the most massive galaxies in the localization volume.\n\nThe Swift UVOT and XRT began pointed galaxy-targeted followup of the\nLIGO/Virgo detected S190426c (LVC GCN. 24237) at 2019-04-26 17:45:00\nUT (T0+142 min) and continued until T0+~48 hours.\n\nThe completed campaign comprised ~800 fields, covering >30% of the\ngalaxy-convolved localization region of the 'LALInference1' skymap.\n\nThe GW rapid followup observations have a nominal 80 s duration, and\nare performed primarily with the u filter and with XRT in PC mode. The\naverage limiting magnitude achieved is ~18.6 in u, and  ~5 x 10^-12\nerg s^-1 cm^-2 in soft X-rays (0.3-10 keV).\n\nAnalysis of the data is ongoing, and candidate counterparts will be\nreported as found.\n\nA list of observed fields, times, and associated target IDs can be found at\nthe following URL for these triggers and for all future GW followup:\nhttp://www.swift.ac.uk/LVC/\n\nWe remind the community that all Swift data are public, and encourage their use.\n\nThis circular is an official product of the Swift team.",
  "circularId": 24353,
  "createdOn": 1556631897000,
  "email": "auc444@psu.edu",
  "subject": "LIGO/Virgo S190426c: Swift rapid follow-up observations of S190425z and S190426c and URL for observation log for all future events",
  "submitter": "Aaron Tohuvavohu at PSU/Swift  <auc444@psu.edu>",
  "eventId": "LIGO/Virgo S190426c"
}