GCN Circular 25671
Subject
GRB 180620A: SEDM Observations
Event
Date
2019-09-05T22:46:33Z (6 years ago)
From
Virginia Cunningham at U of MD <vcunning@astro.umd.edu>
V. Cunningham (U of Maryland), J. D. Neill (Caltech), S. B. Cenko
(NASA GSFC), and R. Walters (Caltech) report on behalf of the
SEDM team:
We observed the optical counterpart to GRB 180620A (Evans, et al.,
GCN 22798) with the Spectral Energy Distribution Machine (SEDM)
on the 60 inch telescope at Palomar Observatory. The SEDM is a
low resolution (R ~ 100) integral field unit spectrometer with a multi-
band (ugri) rainbow camera imager (see Blagorodnova et al. 2018,
PASP, 130, 035003, and Rigault et al. 2019, A&A, 627, A115).
The SEDM began observing the optical counterpart at 9:37:37 UTC
(63 minutes after the burst trigger time). We performed 2 x 1200 s
exposures over the wavelength range 3800-9200 A. The continuum
emission is well-fit by a power law spectrum with index alpha = 1.4
(f_nu ~ nu^-alpha). We do not confidently identify any obvious
emission or absorption features in the spectrum.