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GCN Circular 33629

Subject
GRB 230414B: Redshift from OSIRIS/GTC
Date
2023-04-15T12:00:39Z (10 months ago)
From
J. F. Agui Fernandez at IAA-CSIC <feli@iaa.es>
J. F. Agui Fernandez (IAA-CSIC), C. C. Thoene (ASU-CAS),
A. de Ugarte Postigo (OCA), R. Scarpa, A. Marante and
A. L. Cabrera Lavers (GTC, IAC) report:

We observed the afterglow of GRB 230414B (D'Ai et al. GCN
33612; Evans et al. GCN 33613; Lipunov GCN 33614; Pankov et al.
GCN 33615; Lu et al. GCN 33616; Raman et al. GCN 33618;
Ghosh et al. GCN 33620; Goad GCN 33621; Moskvitin et al.
GCN 33622; Malesani et al. GCN 33623; Zhu et al. GCN 33625)
with OSIRIS at the 10.4m GTC telescope, at the Roque de los
Muchachos Observatory (La Palma, Spain). Observations consisted
of 4x1200 s spectroscopy with grism R1000B, covering the
spectral range between 3700 and 7800 AA.

In a preliminary analysis we identify a broad absorption that we
interpret as due to Ly-alpha. We also see several transitions
coincident with SI, SiII, SiII*, OI, CII, NiII, SiIV, CIV and FeII, all of
them at a common redshift of z = 3.568, which we interpret as
the redshift of the GRB.

This GCN is in honor of the great Alex Kann, the WiseGRBguy.
It happened on the day he was buried while some of
his colleagues were standing at the grave saying farewell.
Even the Universe paid its tribute to him.
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