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ZTF Discovery and Classification of a Young Superluminous Supernova, SN2018fcg (ZTF18abmasep)

ATel #11986; R. Lunnan (OKC), Lin Yan, C. Fremling, A. Dugas, Y. Sharma (CIT), S. Schulze (WIS) and D. A. Perley (LJMU) on behalf of the Zwicky Transient Facility collaboration
on 24 Aug 2018; 19:18 UT
Credential Certification: Ragnhild Lunnan (ragnhildlunnan@gmail.com)

Subjects: Optical, Supernovae

Referred to by ATel #: 11987, 12341

The Zwicky Transient Facility (ZTF; ATel #11266) reports the discovery and classification of SN2018fcg (ZTF18abmasep) as a SLSN-I. The source was first discovered on 2018 Aug 07.37 (UT) at g=20.6 mag. A spectrum obtained with DBSP on the 200-in Hale telescope at Palomar Observatory on 2018 Aug 21 as part of the ZTF Bright Transients Survey (BTS; ATel #11688) shows a blue continuum with broad O II absorption features, similar to SLSN-I PTF09cnd and PTF09atu prior to maximum light (Quimby et al. 2011). Narrow emission lines from the host galaxy give a redshift of z=0.101. As of 2018 Aug 22.36, SN2018fcg has brightened to g=18.5 mag, giving a current absolute magnitude Mg=-19.7 mag and suggesting that the source could still brighten significantly before reaching maximum light. Swift has been triggered for UVOT imaging and further follow-up observations are underway.

 
Survey Name  | IAU Name  |  RA (J2000) |  Dec (J2000) | Disc. date | Disc. mag | Redshift | Class  | Class. date  
------------ |---------  | ----------- | ------------ | ---------- | --------- | -------- | ------ | -----------  
ZTF18abmasep | SN2018fcg | 21:09:36.78 | +33:28:59.6  | 2018-08-07 | 20.62 (g) | 0.101    | SLSN-I | 2018-08-21 
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.