GCN Circular 15964
Subject
GRB 140311A: NOT redshift confirmation
Date
2014-03-12T13:37:59Z (10 years ago)
From
Valerio D'Elia at ASDC <delia@asdc.asi.it>
P. D'Avanzo (INAF-OAB), V. D'Elia (INAF-OAR/ASI-ASDC), S. Piranomonte
(INAF-OAR), A. Melandri (INAF-OAB), D. Malesani (DARK/NBI), T. Pursimo
(NOT), M. C. Baglio, I. Andreoni (INAF-OAB) report on behalf of the
CIBO collaboration:
Following the detection of the optical afterglow reported in D'Avanzo
et al. (GCN 15953), we carried out optical spectroscopy of GRB 140311A
(Racusin et al. GCN 15944) with the Nordic Optical Telescope (NOT)
equipped with ALFOSC. The observation consisted of two 1800 s
exposures covering the range between 3200 and 9100 A carried out at a
mean t-t0=3.37 hours.
Despite the low SNR and a seeing of ~2, we detect broad absorption
features at lambda ~ 7300 and 6100 AA which we interpret as Ly-alpha
and Ly-beta at z ~ 5.
This is consistent with the redshift reported by Tanvir et al(GCN 15961).
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