{
  "circularId": 33832,
  "bibcode": "2023GCN.33832....1O",
  "submitter": "Samantha Oates at University of Birmingham <samantha.oates@alumni.ucl.ac.uk>",
  "subject": "LIGO/Virgo/KAGRA S230518h: Swift/UVOT Upper Limits for Swope candidates: SSS23a, SSS23b and SSS23c",
  "body": "LIGO/Virgo/KAGRA S230518h: Swift/UVOT Upper Limits for Swope candidates: SSS23a, SSS23b and SSS23c \n\nS. R. Oates (U. of Birmingham), A. A. Breeveld (MSSL-UCL), P. Brown (TAMU),\nM. De Pasquale (U. Messina), C. Gronwall (PSU), N. Klingler (NASA-GSFC/UMBC/CRESST II),\nN. P. M. Kuin (UCL-MSSL), F. E. Marshall (NASA/GSFC), M. J. Page (UCL-MSSL),\nM. H. Siegel (PSU), A.P. Beardmore (U. Leicester), M.G. Bernardini (INAF-OAB),\nS. Campana (INAF-OAB), S.B. Cenko (NASA/GSFC), A. D’Aì (INAF-IASFPA), P. D’Avanzo (INAF-OAB),\nV. D’Elia (ASI-SSDC & INAF-OAR), S. Dichiara (PSU), P.A. Evans (U. Leicester),\nR.A.J. Eyles-Ferris (U. Leicester), D. Hartmann (Clemson University),\nJ.A. Kennea (PSU), S. Laha (NASA/GSFC), A.Y. Lien (GSFC/UMBC), A. Melandri (INAF-OAB),\nJ.A. Nousek (PSU), P. O’Brien (U. Leicester), J.P. Osborne (U. Leicester),\nK.L. Page (U. Leicester), D. M. Palmer (LANL), S. Ronchini (PSU), T. Sbarrato (INAF-OAB),\nB. Sbarufatti (INAF-OAB), G. Tagliaferri (INAF-OAB), A. Tohuvavohu (U. Toronto),\nE. Troja (U Tor Vergata, INAF) report on behalf of the Swift team:\n\nWe report Swift/UVOT observations of the candidates SSS23a, SSS23b and SSS23c (Coulter et al.,\nGCN Circ. 33829) found by the Swope 1-m telescope during the search for the EM counterpart\nof the LVC event S230518h (LIGO/VIRGO/KAGRA Collaboration GCN Circ. 33813). \n\nSwift/UVOT observations of the Swope candidates began 1.5 days after the LVK trigger\n(LIGO/VIRGO/KAGRA Collaboration GCN Circ. 33813). We do not detect any of the 3 Swope candidates\nin the UVOT exposures. Preliminary 3-sigma upper limits using the UVOT photometric system\n(Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the exposures are:\n\nTarget   Filter   T_start(s)   T_stop(s) Exp(s)     3sigUL\n\nSSS23a      u       129503      135881     288      >19.2\nSSS23a     w1       129079      135788     585      >19.9\nSSS23a     m2       128445      135607     879      >20.2\nSSS23a     w2       129713      136188     753      >20.1\n         \t      \t                   \nSSS23b      u       140770      140997     223      >19.1\nSSS23b     w1       140310      140765     448      >19.8\nSSS23b     m2       139622      140304     671      >20.1\nSSS23b     w2       141004      141319     309      >19.6\n         \t      \t                   \nSSS23c      u       130526      141885     131      >18.7\nSSS23c     w1       130415      141799     264      >19.3\nSSS23c     m2       130250      141633     395      >19.6\nSSS23c     w2       130586      142008     133      >19.0\n\nThis circular is an official product of the Swift team.",
  "createdOn": 1684584628839,
  "eventId": "LIGO/Virgo/KAGRA S230518h"
}