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SALT spectroscopic classification of nuclear transient Gaia17cqz/AT2017hrw as SN IIP

ATel #10943; N. Ihanec (University of Nova Gorica), M. Gromadzki, L. Wyrzykowski (Warsaw University Astronomical Observatory, Poland), D. A. H. Buckley (South African Astronomical Observatory)
on 10 Nov 2017; 06:03 UT
Credential Certification: Lukasz Wyrzykowski (wyrzykow@astrouw.edu.pl)

Subjects: Optical, Supernovae, Transient

We report on SALT spectroscopy of transient Gaia17cqz/AT2017hrw, discovered by Gaia Science Alerts program on 2017-10-19. The transient was detected in the nucleus of the host galaxy LEDA 381385. A low resolution (R = 350) SALT/RSS spectra was taken on 2017-11-08, under the SALT Large Programme on transients (2016-2-LSP-001).

The spectroscopic classification was done using SNID code (Blondin & Tonry 2007, ApJ, 666, 1024) and it was matched to SN Type IIP at about 2 weeks past maximum. The spectrum shows very broad Halpha line which is typical for this type of SN. Based on the spectral lines, we estimate redshift z=0.026. Gaia photometric measurement at the moment of observation and at this redshift corresponds to the absolute magnitude of about -16.51 mag.

Name | IAU name | RA (J2000) | Dec (J2000) | Disc. Date | Disc. Mag | Obs. Date | z | Host | Type | Notes
Gaia17cqz | AT2017hrw | 21:47:57.52 | -58:10:58.12 | 2017-10-19 | 18.85 | 2017-11-08 | 0.026 | LEDA 381385 | SN IIP | +14 days

We acknowledge ESA Gaia, DPAC and the Photometric Science Alerts Team (http://gsaweb.ast.cam.ac.uk/alerts).