AstroNote 2022-88

The Zwicky Transient Facility (ZTF; Bellm et al. 2019; Graham et al. 2019) Infant Supernova Science Program (Gal-Yam 2019) reports the early discovery and rapid follow-up of SN 2022hnt / ZTF22aafrjnw, following the methodology outlined by Gal-Yam et al. (2011).

The object was first detected on ZTF g-band images obtained on April 14, 2022 at 07:03 UT, about 1 day after the last non-detection, and was picked up by the Redshift Completeness Factor custom Marshal filter. The object was saved by a duty astronomer and rapid follow-up was triggered. 

Assuming the redshift of the apparent host (NGC 3759A, z=0.0192 from NED), the SN was discovered around absolute magnitude Mg=-16.6. A rapid spectrum of the object was obtained using the SEDm (Blagoradnova et al. 2018) reveals a blue continuum that suggests a core-collapse supernova origin. Fruthermore, Swift photometry has been triggered and additional observations are ongoing.

We will continue to distribute alerts on such early SN detections via AstroNotes; additional follow-up observations of this transient are encouraged.

ZTF is a project led by PI S. R. Kulkarni at Caltech, and includes IPAC; WIS, Israel; OKC, Sweden; JSI/UMd, USA; UW,USA; DESY, Germany; NRC, Taiwan; UW Milwaukee, USA and LANL USA. ZTF acknowledges the generous support of the NSF under AST MSIP Grant No 1440341. Alert distribution service provided by DIRAC@UW. Alert filtering is being undertaken by the GROWTH marshal system (Kasliwal et al. 2019), supported by NSF PIRE grant 1545949.