[vsnet-grb-info 23496] GRB 190829A: Keck LRIS spectroscopy of the optical afterglow

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  25595
SUBJECT: GRB 190829A: Keck LRIS spectroscopy of the optical afterglow
DATE:    19/08/31 21:28:59 GMT
FROM:    Kishalay De at Caltech, GROWTH  <kde at astro.caltech.edu>

K. De (Caltech), V. Karambelkar (Caltech), M. M. Kasliwal (Caltech)
report on behalf of the GROWTH collaboration

We obtained a spectrum of the optical afterglow (GCN #25555, #25558,
#25560) of GRB190829A (GCN #25551, #25552) with the Low Resolution
Imaging Spectrometer (LRIS; Oke et al. 1995) on the Keck I telescope.
Observations began at UT 2019-08-31 03:35 for a total exposure time of
20 minutes. The afterglow is clearly detected in the data, and
exhibits a featureless red continuum. Narrow galaxy emission lines of
H alpha and [S II]  are detected at a redshift of z = 0.078,
consistent with the redshift of the underlying galaxy. The red
continuum and host emission features are consistent with those
reported in GCN #25563 and #25565.