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Optical photometry and low-resolution spectroscopy of the SN 2014J

ATel #5843; Jonay I. Gonzalez Hernandez (IAC), Ricardo Genova-Santos (IAC), Jose Alberto Rubi~no-Martin (IAC), Pilar Ruiz-Lapuente (IFF-CSIC, ICC-UB)
on 1 Feb 2014; 18:03 UT
Credential Certification: Jonay I. Gonzalez Hernandez (jonay@iac.es)

Subjects: Optical, Supernovae

Referred to by ATel #: 5876

We have obtained low-resolution spectroscopic data and broadband (g,r,i,z) photometric images at the 4.2m-WHT equipped with the instrument ACAM at the Observatorio del Roque de los Muchachos (La Palma, Spain) on approximately January 28.13 UT. A preliminary analysis of these spectra show the strong Si II (6355A) line moving at ~12600 km/s, and CII (6580A) and SII (5468A) at ~13700km/s and 12150 km/s, respectively. The overall comparison of these spectra with those obtained by Moreno-Raya et al. (ATel #5827), who provide a Si II (6355A) expansion velocity of ~13400 km/s, suggest that SN 2014J is a low-velocity gradient supernova. This is consistent with SiII moving at ~14100 km/s measured on January 23.75 UT reported by Bonev et al. (ATel #5829), and ~13900 km/s obtained on January 23.05 UT by Altavilla (ATel #5818).