AstroNote 2022-142

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 2022oqm / ZTF22aasxgjp, following the methodology outlined by Gal-Yam et al. (2011).

The object was first detected on ZTF g-band images obtained on July 11, 2022 at 04:40 UT, about 1 day after the last non-detection. The object was saved by a duty astronomer and rapid follow-up was triggered.

The lightcurve rose by ~ 3.5 magnitudes within 1 day suggesting that this SN is indeed infant and rapidly rising.

Assuming the redshift of the apparent host NGC 5875, z=0.0113 from NED, the SN was discovered around absolute magnitude Mg = -16.2. Swift photometry has been triggered and additional observations are ongoing.

Followup spectra revealed a broad P-cygni profile consistent with the 5801 and 5812 Å C IV doublet, as well as an emission line consistent with C IV 4658 Å. No Balmer series lines were identified, leading to a provisional classification of a type I supernova.

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.