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Table A.4

Spectral observations log for iPTF13z.

UT Date Epoch (days) Telescope Instrument Resolution (km s-1) Spectral range (Å) Comments

2013 February 18 17.08 P200 DBSP 200 3210–10 100 Classification spectrum
2013 August 13 192.7 APO DIS 340 3340–8500
2014 January 12 344.79 NOT ALFOSC 480 5000–9120
2014 February 12 375.74 NOT ALFOSC 690 3400–9120
2014 March 1 393.11 Keck 2 DEIMOS 130 4900–10 130
2014 April 27 450.15 Keck 2 DEIMOS 130 4910–10 150 Noisy spectrum
2014 May 26 479.05 Keck 2 DEIMOS 130 4920–10 140
2014 July 2 515.97 Keck 2 DEIMOS 130 4550–9600
2014 July 31 544.87 Keck 1 LRIS 260 3070–10 300
2015 January 26 723.76 NOT ALFOSC 500 3650–9110 Dominated by host
2015 September 17 957.75 Keck 2 DEIMOS 140 4750–9600 Dominated by host

Notes. For our spectroscopy, we used the Double Spectrograph (DBSP) on the 5 m telescope (P200) at Palomar Observatory, the Dual Imaging spectrograph (DIS) on the Astrophysical Research Consortium 3.5 m telescope at Apache Point Observatory (APO; New Mexico, USA), the Andalucia Faint Object Spectrograph and Camera (ALFOSC) on the 2.5 m Nordic Optical Telescope (NOT) at the Roque de los Muchachos observatory (La Palma, Spain), the DEep Imaging Multi-Object Spectrograph (DEIMOS) on the 10 m Keck 2 telescope at the W. M. Keck Observatory (Hawaii, USA), and the Low Resolution ImagingSpectrometer (LRIS) on the 10 m Keck 1 telescope. The resolution of the spectra were measured using the [O iii] λ4959 line (or, when resolved, the [S ii] λ6717, 6731 lines) of the host galaxy. The epoch of the measurements are given relative to the time of SN discovery (JD 2 456 324.98).

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