ZTF early discovery and rapid follow-up of the infant SN 2018fif (ZTF18abokyfk)
ATel #11978; A. Gal-Yam, M. Soumagnac, S. Schulze, R. Bruch (WIS); C. Fremling (CIT), A. Horesh (HUJI), on behalf of the Zwicky Transient Facility collaboration
on 23 Aug 2018; 09:38 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Avishay Gal-Yam (avishay.gal-yam@weizmann.ac.il)
Subjects: Radio, Optical, Ultra-Violet, Supernovae, Transient
Referred to by ATel #: 12003
The Zwicky Transient Facility (ZTF; ATel #11266) Infant Supernova Science Program reports the early discovery and rapid follow-up of SN 2018fif (ZTF18abokyfk).
The object was first detected on ZTF r-band images obtained on August 21, 2018 at 8:46 UT, about 23 hours after the last non-detection, and was picked up by the infant supernova custom Marshal filter. The object was saved by a duty astronomer and rapid follow-up was triggered. A spectrum obtained with the 5m Hale telescope at Palomar Observatory on 12:08 UT showed a smooth blue continuum with a weak flash feature of He II, suggesting this is a very young core-collapse event, at the redshift of the apparent host (UGC 85, z=0.017189 from NED). Swift photometry obtained starting 13:40 UT shows clear detection in all UVOT filters. Radio follow-up conducted using AMI several hours later resulted in a non-detection, with a flux upper limit of 0.4 mJy. Additional observations are ongoing.
ZTF is a project led by PI S. R. Kulkarni at Caltech (see ATEL #11266), 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, supported by NSF PIRE grant 1545949.
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