{
  "bibcode": "2019GCN.24862....1K",
  "body": "N. P. M. Kuin (UCL-MSSL), A. A. Breeveld (MSSL-UCL),  C. Gronwall (PSU),\nF. E. Marshall (NASA/GSFC), S. R. Oates (Uni. of Warwick), M.J. Page\n(UCL-MSSL),\nM. de Pasquale (Istambul U), M. H. Siegel (PSU), A. D'Ai (INAF-IASFPA),\nP. D'Avanzo (INAF-OAB), S. D. Barthelmy (NASA/GSFC), A. P. Beardmore (U.\nLeicester),\nD. N. Burrows (PSU), S. Campana (INAF-OAB), S. B. Cenko (NASA/GSFC),\nG. Cusumano (INAF-IASF PA), V. D'Elia(ASDC), P. A. Evans (U. Leicester),\nP. Giommi (ASI), D. Hartmann (Clemson U.), J. A. Kennea (PSU),\nH. A. Krimm (NSF), A. Y. Lien (GSFC/UMBC), D. B. Malesani (DTU Space),\nA. Melandri (INAF-OAB), J. A.  Nousek (PSU), P. T. O'Brien (U. Leicester),\nJ. P. Osborne (U. Leicester), C. Pagani (U. Leicester), K. L. Page\n(U.Leicester),\nD.M. Palmer (LANL), M. Perri (ASDC), J. L. Racusin (NASA/GSFC), T. Sakamoto\n(AGU),\nB. Sbarufatti (INAF-OAB/PSU), G. Tagliaferri (INAF-OAB), A. Tohuvavohu\n(PSU),\nand E. Troja (NASA/GSFC/UMCP) report on behalf of the Swift team:\n\nSwift UVOT instrument started follow up observations of LVC event S190510g\n121 minutes after the event until just over 3 days later, observing 977\nfields\nin the highest probability region (Evans et al., GCN Circ. No. 24541).\n\nThe UVOT approach for searching for the ultraviolet-optical counterpart has\nbeen described in Kuin et al. (GCN Circ. No. 24767). The limiting magnitude\ncan vary but typically is 18.6th magnitude (Vega). The automated UVOT\nprocessing\nfound 2836 galaxies using the GLADE catalog and flagged 121 counterpart\ncandidates. Human inspection of these 121 candidates found no credible\noptical-ultraviolet source for the event, but 105 out of the 121 candidates\nwere due to an unstable attitude or due to image artifacts from very bright\nsources. Neither did further inspection of the images of the galaxies lead\nto a candidate missed by the automated processing.",
  "circularId": 24862,
  "createdOn": 1561038866000,
  "email": "npkuin@gmail.com",
  "subject": "LIGO/Virgo S190510g: Swift UVOT - no new counterpart candidates identified",
  "submitter": "Paul Kuin at MSSL  <npkuin@gmail.com>",
  "eventId": "LIGO/Virgo S190510g"
}