Swift Observations of the TDE ASASSN-14li Show That It Remains Bright in UV and X-rays
ATel #8309; T. W.-S. Holoien (Ohio State), D. Grupe (Morehead State) K. Z. Stanek, C. S. Kochanek, J. S. Brown, D. Godoy-Rivera (Ohio State), B. J. Shappee (Hubble Fellow, Carnegie Observatories), J. L. Prieto (Diego Portales; MAS), D. Bersier (LJMU), Subo Dong, Ping Chen (KIAA-PKU)
on 20 Nov 2015; 06:07 UT
Distributed as an Instant Email Notice Transients
Credential Certification: Thomas Holoien (tholoien@astronomy.ohio-state.edu)
Subjects: Optical, Ultra-Violet, X-ray, Transient
We have analyzed new Swift UVOT and XRT observations of the TDE ASASSN-14li (Holoien et al. 2015, MNRAS, in press), which has re-emerged from behind the Sun. The new UVOT data, obtained on 2015-11-14, show that the transient has faded only slightly in all UV filters during the ~3 months it was unobservable. Measurements for the last two Swift epochs are given in the tables below:
2015-11-14 data:
Filter Mag Unc
V 15.82 0.071
B 16.44 0.054
U 16.53 0.073
UVW1 17.05 0.076
UVM2 17.13 0.067
UVW2 16.99 0.067
2015-08-12 data:
Filter Mag Unc
U 16.59 0.073
UVW1 16.92 0.085
UVM2 17.05 0.085
UVW2 16.80 0.058
ASASSN-14li is also still clearly detected in the XRT data with a flux of 1.28e-11 ergs/s/cm^2 in the 0.3-10 keV band. This is a slightly higher flux than was measured previously (0.82e-11 ergs/s/cm^2 on 2015-08-12).
Further observations in all wavelengths are highly encouraged.
We thank the Swift team for approving and promptly scheduling these observations.