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Asiago observation of the OT of GRB150413A detected by MASTER

ATel #7391; L. Tomasella, S. Benetti, E. Cappellaro, N. Elias-Rosa, P. Ochner, A. Pastorello, L. Tartaglia, G. Terreran, M. Turatto (INAF OAPd)
on 14 Apr 2015; 10:44 UT
Credential Certification: Lina Tomasella (lina.tomasella@oapd.inaf.it)

Subjects: Optical, Gamma-Ray Burst

In the framework of the Asiago Transient Classification Program (Tomasella et al. 2014, AN, 335, 841), we have spectroscopically observed the OT of GRB150413A detected by MASTER (Atel #7381) with the Asiago 1.82 m Copernico Telescope (+AFOSC; range 340-820 nm; resolution 1.4 nm), on 20150413.87 UT, that is about 7.0h after detection.

The spectrum of the optical transient shows an almost flat continuum with a saturated, broad absorption centered at 5025 A. If this absorption is identified with Lyman alpha corresponds to a redshift z=3.17.

Optical photometry has also been obtained, providing the following sloan filter magnitudes: r=18.3 (13.900 UT), i=17.9 (13.901 UT) and g = 19.3 (13.903 UT).

The Asiago classification spectra are posted at the website http://sngroup.oapd.inaf.it.

Padova Asiago Supernova group