Skip to main content
Testing. You are viewing the public testing version of GCN. For the production version, go to https://gcn.nasa.gov.
Introducing Einstein Probe, Astro Flavored Markdown, and Notices Schema v4.0.0. See news and announcements

GCN Circular 22346

Subject
GRB 180115A: Redshift from OSIRIS/GTC
Date
2018-01-15T22:57:40Z (6 years ago)
From
Antonio de Ugarte Postigo at IAA-CSIC <deugarte@iaa.es>
A. de Ugarte Postigo (HETH/IAA-CSIC, DARK/NBI), Z. Cano, L. Izzo, 
C.C. Thoene, D.A. Kann (HETH/IAA-CSIC), N. Castro-Rodriguez 
(Grantecan, IAC, ULL), D. Perez Valladares (Grantecan) report on 
behalf of a larger collaboration:

We observed the afterglow of GRB 180115A (Cannizzo et al. GCN 22335, 
Cano et al. GCN 22345) with OSIRIS at the 10.4m GTC telescope. The 
observation consisted of 3x900s exposure with grism R1000B, covering 
the range between 3700 and 7800 Angstrom and was performed under 
bad seeing conditions.

The observation started at 20:32 UT (16.28 hr after the burst), and the 
acquisition image shows the afterglow at r=21.2+/-0.2. The spectrum 
shows a weak continuum over all the spectral range. The low signal to 
noise ratio of the spectrum only allows us to detect a single broad spectral 
feature that we identify as Lyman alpha at a redshift of 2.487.
Looking for U.S. government information and services? Visit USA.gov