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
Catalog Name Reported RA Reported DEC Reported Obj-Type Reported Redshift Host Name Host Redshift Remarks TNS RA TNS DEC TNS Obj-Type TNS Redshift
TNS 2020sic [ZTF20abxyjtx] 15:47:45.100 +28:38:24.90 NGC 6001 0.03324 15:47:45.110 +28:38:25.22 SN II 0.03324

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