GCN Circular 18213
Subject
GRB 150818A: Spectroscopic confirmation of the SN from GTC
Event
Date
2015-08-31T17:49:21Z (10 years ago)
From
Antonio de Ugarte Postigo at IAA-CSIC <deugarte@iaa.es>
A. de Ugarte Postigo (IAA-CSIC, DARK/NBI), Z. Cano (U. Iceland),
D. A. Perley (DARK/NBI), S. Schulze (PUC, MAS), D. Xu (NAOC/CAS),
R. Sanchez-Ramirez (IAA-CSIC), D. Malesani (DARK/NBI), G. Lombardi
(GRANTECAN, IAC, ULL), and A. Garcia (GRANTECAN), R. Scarpa
(GRANTECAN) report on behalf of a larger collaboration:
We observed the counterpart of GRB 150818A (D'Elia et al. GCN 18152;
Marshall et al. GCN 18155; McCauley et al. GCN 18161; Mazaeva et al.
GCN 18175; Sanchez-Ramirez et al. GCN 18177; Mazaeva et al. GCN
18182, GCN 18189, GCN 18205; Schulze et al. GCN 18179) with the
10.4 m GTC telescope (+OSIRIS) on the 29th August 2015 (11.4 days
after the burst). The observation consisted of 3x900 s spectroscopy using
the R1000B grism (3700-7800 AA coverage with a resolution of ~1000)
plus g-, r- and i-band imaging. We detect a point-like source at the location
of the afterglow superposed on top of an extended source.
The combined spectrum shows broad features typical of a broad-lined
Type Ic SN near maximum light, thus confirming the detection of a rising
supernova proposed by Mazaeva et al. (GCN 18205). The spectrum also
shows narrow emission features of [OII], [OIII] and H-beta at z=0.282
(Sanchez-Ramirez et al. GCN 18177).