AstroNote 2022-92

AT2021uvz is a nuclear transient first reported to TNS by the Zwicky Transient Facility (ZTF) on 2021 Aug 4. It was classified as a tidal disruption event (TDE) in a galaxy at z=0.176 (Yao et al. 2022, TNS Classification Report 12234). 

Two previous Swift observations on 2021 Aug 23 and 2021 Nov 21 showed no X-rays, with an average 3-sigma count rate upper limit of 0.0014 count/s. A recent 2.64ks Swift observation  conducted on 2022 April 13 shows the detection of soft X-ray emission at 0.0119 +/- 0.0024 count/s. An absorbed blackbody (tbabs*zbbody) model fit to the XRT spectrum suggests a blackbody temperature of 89 -23 +43 eV, and a 0.3--2 keV flux of (4.1 -1.6 +0.5) E-13 erg/cm^2/s, corresponding to a luminosity of (3.5 -1.4 +0.4) E+43 erg/s.

We note that AT2021uvz exhibits an interesting double-peaked optical light curve profile, see https://lasair.roe.ac.uk/object/ZTF21abmwftm/

We plan to continue Swift monitoring and spectroscopic follow-up observations. Further follow-up observations, especially at the radio wavelength, are strongly encouraged.