Spectroscopic observation of AT2021ybe by NUTS2 (NOT Un-biased Transient Survey-2)
ATel #15224; N. Elias-Rosa, A. Pastorello, S. Benetti (INAF-OAPd), A. Reguitti (UNAB), E. Kankare (UTU), P. Lundqvist (Stockholm University), M. D. Stritzinger (Aarhus University)
on 14 Feb 2022; 19:03 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: N. Elias-Rosa (nancy.elias@inaf.it)
Subjects: Optical, Blazar, Supernovae, Transient
The Nordic Optical Telescope (NOT) Unbiased Transient Survey (NUTS; ATel #8992) reports the spectroscopic classification of AT2021ybe (ATLAS21bhuy; Tonry et al. 2021, TNSTR 3059; also known as Gaia22acp and ZTF19aalwfly) associated with the radio source MG3 J035118+2925.
The observation was performed with the 2.56 m Nordic Optical Telescope equipped with ALFOSC on 2022-02-13.93 UT (range 340-980 nm; resolution 1.3 nm).
IAU Name | Survey name | Redshift | Discovery (UT) | Discovery mag | Type | Notes
AT 2021ybe | ATLAS21bhuy | 0.742 | 2021-09-04.59 | 19.66 (ATLAS-o) | Blazar | (1)
(1) The noisy spectrum shows a relatively red continuum. A narrow absorption at 487.3 nm (with FWHM ~ 1300 km/s) is visible, while other features are not clearly detected. The object presents a g-r ~ 0.4-0.5 (from ZTF) and a decrease of ~0.5 mag in the last two days. Given the overall properties, we rule out that AT2021ybe is a supernova. Tentatively, we suggest that AT2021ybe could be a blazar at a z~0.742 if the narrow blue absorption matches with the Mg II (279.63, 280.35 nm) doublet. A Galactic reddening of E(B-V) = 0.20 is derived from Schlafly & Finkbeiner 2011, ApJ, 737, 103.
