GCN Circular 21758
Subject
LIGO/Virgo G299232: Further Swift/UVOT Observations of Optical Transient SwiftJ014008.5+343403.6
Date
2017-08-29T22:55:12Z (7 years ago)
From
Samuel Emery at UCL-MSSL/Swift <samuel.emery.15@ucl.ac.uk>
S.W.K. Emery (UCL-MSSL), A.A. Breeveld (UCL-MSSL), F.E. Marshall (NASA/GSFC),
S.R. Oates (Uni. of Warwick), N.P.M. Kuin (UCL-MSSL), 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), A. D'Ai (INAF-IASFPA),
P. D'Avanzo (INAF-OAB), V.D'Elia(ASDC), P.A. Evans (U. Leicester),
P. Giommi (ASI), C. Gronwall (PSU), J.A. Kennea (PSU), H.A. Krimm (CRESST/GSFC/USRA),
A.Y. Lien (GSFC/UMBC), 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), M.H. Siegel (PSU), G. Tagliaferri (INAF-OAB),
A. Tohuvavohu (PSU), E. Troja (NASA/GSFC/UMCP)
report on behalf of the Swift team:
Swift has performed follow-up ToO observations of the optical transient SwiftJ014008.5+343403.6,
reported in Emery et al. (GCN 21733). We obtained 4 ks of data from 278 ks to 341 ks after the
LVC trigger. This source has faded and is no longer detected in any filter. Earlier MASTER observations
did not detect this source, see Lipunov et al. (GCN 21749). Other observatories have also not detected
the source (Tomasella et al. (GCN 21745); Pozanenko et al. (GCN 21754); Copperwheat et al. (GCN 21755);
Jonker et al. (GCN 21756); Butler et al. (GCN 21757)).
We obtain preliminary 3-sigma upper limits using the UVOT photometric system
(Breeveld et al. 2011, AIP Conf. Proc. 1358, 373):
Filter Start time Stop time Exposure(s) Magnitude(Vega)
v T0+278 ks T0+341 ks 372 >20.1
b T0+277 ks T0+340 ks 372 >21.1
u T0+277 ks T0+340 ks 372 >20.7
uvw1 T0+276 ks T0+340 ks 745 >21.0
uvm2 T0+278 ks T0+341 ks 514 >20.5
uvw2 T0+277 ks T0+340 ks 1491 >21.6
The magnitudes are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.04 in the direction of the source
(Schlegel et al. 1998).
Further Swift observations are planned.