AstroNote 2020-170

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DRAFT
2020-09-02 08:31:10
Type: Object/s-Discovery/Classification
ZTF early discovery and rapid follow-up of the infant core-collapse SN ZTF20abxyjtx / 2020sic
Authors: Steve Schulze (WIS), Jesper Sollerman (OKC), Daniel A. Perley (LJMU), Erez Zimmerman (WIS)
Abstract:
We report the ZTF discovery and the follow-up of ZTF20abxyjtx / 2020sic - a young core-collapse supernova in the nearby galaxy NGC 6001 (z=0.03324). At a distance of ~140 Mpc the transient was discovered on 1 September 2020 with an absolute ZTF r-band magnitude of M = -16.3.

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 ZTF20abxyjtx / 2020sic, following the methodology outlined by Gal-Yam et al. (2011).

The object was first detected on ZTF r-band images obtained on 1 September 2020 at 03:13 UT, about 2 days after the last non-detection, and was picked up by a fast transient custom ZTF filter. A duty astronomer saved the object and rapid follow-up was triggered. The object was publicly announced by Perley (2020TNSTR2691....1P).

Assuming the redshift of the host galaxy NGC 6001 (z=0.03324; NED), the SN was discovered at an absolute magnitude M_r=-16.3. Swift photometry has been triggered, and additional observations are ongoing.

During the 24 hours following its discovery, we obtained an optical spectrum with the ALFOSC spectrograph mounted on the 2.56-m Nordic Optical Telescope at Roque de los Muchachos Observatory, La Palma, Spain. We used a 1-arcsec slit and grism #4 covering the spectral range from 3500-9400 AA. The integration of the spectrum is 1800 s. The spectrum shows narrow emissions of H, He II, NIII, and CIV, indicative of flash features, super-imposed on a hot blackbody spectrum.

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.

Show current TNS values
CatalogNameReported RAReported DECReported Obj-TypeReported RedshiftHost NameHost RedshiftRemarksTNS RATNS DECTNS Obj-TypeTNS Redshift
TNS2020sic [ZTF20abxyjtx]15:47:45.100+28:38:24.90NGC 60010.0332415:47:45.100+28:38:24.90SN II0.03324