AstroNote 2025-342

AT 2025afvr/ZTF25acfyeke (RA=01:07:36.287, Dec=+24:22:39.83) was discovered by the ZTF survey on 2025-11-25 (MJD=61004.14) and is still in a rising phase in optical band. We triggered optical spectroscopic observations of AT2025afvr using YFOSC on board the LiJiang 2.4 m telescope on 2025-12-10 (MJD 61019) and the NGPS monunted on the Palomar 200-inch telescope on 2025-12-13 (MJD 61022). Both spectra exhibit a largely featureless blue continuum, lacking distinct emission or absorption lines. This characteristic is consistent with featureless tidal disruption events. However, the redshift cannot be determined due to the absence of any robust spectral features.

We immediately triggered Swift ToO observations of AT2025afvr after identifying the object via the Lijiang 2.4m spectrum. The first epoch was observed on 2025-12-17 (MJD=61026.47). No significant X-ray emission was detected, and a 3-sigma upper limit of 2.84 × 10⁻¹³ erg s⁻¹ cm⁻² was derived for the 0.3–10 keV flux. In contrast, the source is clearly detected in the UVOT UV bands, with AB magnitudes of UVW2 = 17.72 ± 0.04 mag, UVM2 = 17.71 ± 0.05 mag, and UVW1 = 17.64 ± 0.04 mag on 2025-12-17 (MJD=61026.6), after correcting for Galactic extinction. Assuming a redshift of 0.38 (host photoz from SDSS), the blackbody temperature fitted from the UV-optical spectral energy distribution is 33036 ± 703 K, which is consistent with that of a typical TDE.

We classified AT2025afvr as a featureless TDE given its featureless spectrum and blue continuum. Continued monitoring of this source is ongoing.