GCN Circular 25525
Subject
LIGO/Virgo S190814bv: Swift UVOT - no new counterpart candidates identified
Date
2019-08-28T18:31:22Z (5 years ago)
From
Alice Breeveld at MSSL-UCL <a.breeveld@ucl.ac.uk>
A. A. Breeveld (UCL-MSSL), S. R. Oates (U. Warwick), F. E. Marshall (NASA/GSFC), N. P. M. Kuin
(UCL-MSSL), M.J. Page (UCL-MSSL), P. Brown (TAMU), C. Gronwall (PSU), M. de Pasquale (Istambul U.),
M. H. Siegel (PSU), A. D'Ai (INAF-IASFPA), P. D'Avanzo (INAF-OAB), S. D. Barthelmy (NASA/GSFC), A.
P. Beardmore (U. Leicester), D. N. Burrows (PSU), S. Campana (INAF-OAB), S. B. Cenko (NASA/GSFC), G.
Cusumano (INAF-IASF PA), V. D'Elia(ASDC), P. A. Evans (U. Leicester), P. Giommi (ASI), D. Hartmann
(Clemson U.), J. A. Kennea (PSU), H. A. Krimm (NSF), A. Y. Lien (GSFC/UMBC), D. B. Malesani
(DARK/NBI), A. Melandri (INAF-OAB), J. A. Nousek (PSU), P. T. O'Brien (U. Leicester), J. P. Osborne
(U. Leicester), C. Pagani (U. Leicester), K. L. Page (U.Leicester), D.M. Palmer (LANL), M. Perri
(ASDC), J. L. Racusin (NASA/GSFC), T. Sakamoto (AGU), B. Sbarufatti (INAF-OAB/PSU), G. Tagliaferri
(INAF-OAB), A. Tohuvavohu (PSU), and E. Troja (NASA/GSFC/UMCP) report on behalf of the Swift team:
The Swift UVOT instrument started follow up observations of the LIGO-Virgo event S190814bv (LVC GCN
Circ. 25324) 11ks after the trigger following the tiling programme described in Evans et al. (GNC
Circ. 25400).
The UVOT approach for searching for the ultraviolet-optical counterpart has been described in Kuin
et al. (GCN Circ. 24767). The limiting magnitude can vary but typically is 18.6th magnitude (Vega)
in the U filter. In the 352 fields that were observed, UVOT detected 98 counterpart candidates and
2257 catalogued galaxies. None of the candidates from the automated processing proved to be a viable
candidates. Neither did the additional inspection of all 2257 imaged galaxies lead to a candidate
missed by the automated processing.