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SWIFT observation of the Tidal Disruption candidate LSQ12heq

ATel #4739; E. Hadjiyska (Yale), B. P. Miller (University of Michigan), R. C. Reis (University of Michigan)
on 17 Jan 2013; 02:57 UT
Credential Certification: Ellie Hadjiyska (ellie.hadjiyska@yale.edu)

Subjects: Ultra-Violet, X-ray, AGN, Black Hole, Supernovae, Transient

Referred to by ATel #: 4758, 4763

We report on 4 consecutive SWIFT UVOT+XRT ToO observations of the initially assumed tidal disruption candidate LSQ12heq (ATel # 4644) commencing on 2012 Dec 18. The UVOT magnitudes (background subtracted, uncorrected for the host galaxy) obtained are, as follows: AB magnitudes with statistical errors (sys <= 0.03)
Obs 1 Obs 2 Obs 3 Obs 4
Filter mag err mag err mag err mag err
V >19.75 19.03 0.27 19.64 0.4 19.21 0.30
B 19.01 0.13 19.32 0.17 19.33 0.17 19.57 0.29
U 19.33 0.12 19.42 0.14 19.48 0.14 19.60 0.15
W1 19.68 0.12 19.79 0.13 19.68 0.12 20.11 0.15
W2 20.19 0.11 20.14 0.11 20.33 0.12 20.39 0.13
LSQ12heq demonstrates excess UV flux from its host, GALEX J033304.1-281248 which has FUV and NUV magnitudes of 23.2 and 22.4 respectively. The 3.7 ks stacked 0.3-10 keV image does not show any obvious X-ray counterpart. There are 5 counts within an r=30" aperture centered at the UV position (some likely from an unrelated source ~50" south). The PSF-corrected 95% confidence upper limit on the unabsorbed flux, assuming a Gamma=2 powerlaw, is 8.8e-14 erg/cm2/s which corresponds to Lx < 5e42 for z=0.15. We thank the Swift team for having performed this observation.