Title: X-ray non-detection of TDE Candidate AT2019qiz using the Swift XRT
ATel #13143; K. Auchettl (DARK/NBI), T. Hung, R. J. Foley (UCSC), K. Z. Stanek, C. S. Kochanek, S. Mathur (Ohio State), B. J. Shappee (IfA-Hawaii), T. W.-S. Holoien (Carnegie Observatories)
on 28 Sep 2019; 18:20 UT
Credential Certification: Ryan Foley (foley@ucsc.edu)
Subjects: X-ray, Tidal Disruption Event
The Neil Gehrels Swift Observatory made a XRT photon counting mode exposure
of the candidate tidal disruption event (TDE) AT2019qiz (Siebert et al. 2019,
ATel #13131) starting on the 2019 September 27 01:12:34, for a net exposure of
1.33 ks (Swift Target ID 12012, Swift ObsID 00012012002).
No source is detected at the location of AT2019qiz. Using an extraction circle with
a radius of 50 arcsec centered at the position of the event and a source-free
background region of equivalent size, we find a total number of 1 event for both
the source and background region. This corresponds to a (conservative)
three-sigma upper limit to the 0.3-10.0 keV X-ray count rate of 0.003.
Assuming an absorbed powerlaw with Gamma = 2 and a Galactic absorption of
6.5E20 cm^-2, 1 total photon in 1.33 ks exposure equates to a 3-sigma upper limit
to the flux in the 0.3-10.0 keV energy band of 1.09E-13 erg/cm^2/s. The
corresponding luminosity limit for a redshift of z = 0.0151 is L < 6.4E40 erg/s.
