GCN Circular 16454
Subject
GRB140606B/iPTF14bfu: Keck detection of an associated supernova
Event
Date
2014-06-25T05:24:36Z (12 years ago)
From
Daniel Perley at Caltech <dperley@astro.caltech.edu>
D. A. Perley (Caltech), M. L. Graham, A. V. Filippenko (UC Berkeley),
and S. B. Cenko (GSFC) report:
We acquired a single 1200-second spectrum of iPTF14bfu (Singer et al.,
GCN 16360; Perley et al., GCN 16365), the optical transient associated
with GRB 140606B (Burns et al., GCN 16363), using the Low Resolution
Imaging Spectrometer (LRIS) on the Keck I 10-meter telescope. The
observation was conducted starting at 13:00 UT on 2014-06-24, 18.4 days
after the GBM trigger, and covers a wavelength range from 320-1028
nanometers.
The spectrum shows several broad emission features and a significant
decrease in flux toward both the blue and red ends. A comparison with
SN 1998bw* using superfit (Howell et al. 2005, ApJ 634, 1190) shows a
good match between the observed features and the spectrum of SN 1998bw
near maximum light, indicating that the transient has evolved into a
Type Ic-BL supernova.
* http://www.astro.caltech.edu/~dperley/grb/140606b/140606b_98bw.png