Spectroscopic observation of AT 2019azh by NUTS (NOT Un-biased Transient Survey)

ATel #12529; Teppo Heikkila, Tom Reynolds, Erkki Kankare, Seppo Mattila (Univ. Turku), Iair Arcavi (Tel Aviv Univ.), K. Decker French (Carnegie), Ann Zabludoff (Univ. Arizona), Mariusz Gromadzki (Univ. Warsaw), Peter Lundqvist (Stockholm Univ.), Stefano Benetti (INAF-OAPd), Joonas Viuho, Rosa Clavero Jimenez (NOT)
on 25 Feb 2019; 13:31 UT
Credential Certification: Thomas Reynolds (treynolds1729@gmail.com)

Tweet

The Nordic Optical Telescope (NOT) Unbiased Transient Survey (NUTS; ATel #8992) reports the spectroscopic observation of the nuclear transient ZTF17aaazdba / ASASSN-19dj in the host galaxy KUG 0810+227. We flagged the transient in the public ZTF Alert Stream via MARS (http://mars.lco.global), since it occurred in the center of a post-starburst galaxy identified for the aSEATiDE survey (PI: Arcavi). The transient was later independently reported as ASASSN-19dj / AT 2019azh in ATel #12526.

The transient was observed with the 2.56 m Nordic Optical Telescope equipped with ALFOSC (range 350-950 nm; resolution 1.6 nm FWHM) on 2019-02-21, starting 23:51 UT. A 900s spectrum was obtained using ALFOSC grism #4 with a 1.3" slit (with seeing ~2"). The spectrum shows an increase in the blue continuum flux compared to the host galaxy spectrum from SDSS, and no discernible new spectral features.

 
Survey Name    | IAU Name   | Discovery (UT)  | Discovery mag | Observation (UT) | Redshift | Type | Phase   | Notes 
ZTF17aaazdba   | AT 2019azh | 2019-02-22.03   | 16.3          | 2019-02-21.99    | 0.022    | --   | --      | --