GRB 220101A: NOT redshift confirmation

J. P. U. Fynbo; A. de Ugarte Postigo; D. Xu; D. B. Malesani; B. Milvang-Jensen; J. Viuho

GRB 220101A: NOT redshift confirmation

J. P. U. Fynbo, A. de Ugarte Postigo, D. Xu, D. B. Malesani, B. Milvang-Jensen, J. Viuho

Research output: Contribution to journal › Journal article › Research

Abstract

We observed the optical counterpart of GRB 220101A (Tohuvavohu et al., GCN 31347; Arimoto et al., GCN 31350) using the Nordic Optical Telescope (NOT) equipped with the ALFOSC spectrograph. A spectrum with exposure time 4x1200 s (grism #20) was secured starting on 2022 Jan 1.81 UT (14.3 hr after the GRB), under good conditions, and covering the wavelength range 5600-10200 AA. A very clear trace is detected from the afterglow continuum. A deep, broad trough is detected around 6800 AA, which we interpret as due to damped Lyman alpha. A number of narrow absorption features are also clearly visible and allow to determine accurately the GRB redshift. We identify, among others, N V, S II, Si II, Si II*, O I, Ni II, C II, Si IV, C IV, Fe II, Fe II*, and Al II, all at a common redshift z = 4.618. Our results thus fully confirm the finding of Fu et al. (GCN 31353). Nice year start for GRBs: happy 2022 to all GCN readers!

Original language	English
Journal	GRB Coordinates Network, Circular Service
Issue number	31359
Publication status	Published - 1 Jan 2022

Access to Document

http://adsabs.harvard.edu/abs/2022GCN.31359....1F

Cite this

@article{d71bd1248efa44ecb51f8b01f2bf3494,

title = "GRB 220101A: NOT redshift confirmation",

abstract = "We observed the optical counterpart of GRB 220101A (Tohuvavohu et al., GCN 31347; Arimoto et al., GCN 31350) using the Nordic Optical Telescope (NOT) equipped with the ALFOSC spectrograph. A spectrum with exposure time 4x1200 s (grism #20) was secured starting on 2022 Jan 1.81 UT (14.3 hr after the GRB), under good conditions, and covering the wavelength range 5600-10200 AA. A very clear trace is detected from the afterglow continuum. A deep, broad trough is detected around 6800 AA, which we interpret as due to damped Lyman alpha. A number of narrow absorption features are also clearly visible and allow to determine accurately the GRB redshift. We identify, among others, N V, S II, Si II, Si II*, O I, Ni II, C II, Si IV, C IV, Fe II, Fe II*, and Al II, all at a common redshift z = 4.618. Our results thus fully confirm the finding of Fu et al. (GCN 31353). Nice year start for GRBs: happy 2022 to all GCN readers!",

author = "Fynbo, {J. P. U.} and {de Ugarte Postigo}, A. and D. Xu and Malesani, {D. B.} and B. Milvang-Jensen and J. Viuho",

year = "2022",

month = jan,

day = "1",

language = "English",

journal = "GRB Coordinates Network, Circular Service",

number = "31359",

}

TY - JOUR

T1 - GRB 220101A

T2 - NOT redshift confirmation

AU - Fynbo, J. P. U.

AU - de Ugarte Postigo, A.

AU - Xu, D.

AU - Malesani, D. B.

AU - Milvang-Jensen, B.

AU - Viuho, J.

PY - 2022/1/1

Y1 - 2022/1/1

N2 - We observed the optical counterpart of GRB 220101A (Tohuvavohu et al., GCN 31347; Arimoto et al., GCN 31350) using the Nordic Optical Telescope (NOT) equipped with the ALFOSC spectrograph. A spectrum with exposure time 4x1200 s (grism #20) was secured starting on 2022 Jan 1.81 UT (14.3 hr after the GRB), under good conditions, and covering the wavelength range 5600-10200 AA. A very clear trace is detected from the afterglow continuum. A deep, broad trough is detected around 6800 AA, which we interpret as due to damped Lyman alpha. A number of narrow absorption features are also clearly visible and allow to determine accurately the GRB redshift. We identify, among others, N V, S II, Si II, Si II*, O I, Ni II, C II, Si IV, C IV, Fe II, Fe II*, and Al II, all at a common redshift z = 4.618. Our results thus fully confirm the finding of Fu et al. (GCN 31353). Nice year start for GRBs: happy 2022 to all GCN readers!

AB - We observed the optical counterpart of GRB 220101A (Tohuvavohu et al., GCN 31347; Arimoto et al., GCN 31350) using the Nordic Optical Telescope (NOT) equipped with the ALFOSC spectrograph. A spectrum with exposure time 4x1200 s (grism #20) was secured starting on 2022 Jan 1.81 UT (14.3 hr after the GRB), under good conditions, and covering the wavelength range 5600-10200 AA. A very clear trace is detected from the afterglow continuum. A deep, broad trough is detected around 6800 AA, which we interpret as due to damped Lyman alpha. A number of narrow absorption features are also clearly visible and allow to determine accurately the GRB redshift. We identify, among others, N V, S II, Si II, Si II*, O I, Ni II, C II, Si IV, C IV, Fe II, Fe II*, and Al II, all at a common redshift z = 4.618. Our results thus fully confirm the finding of Fu et al. (GCN 31353). Nice year start for GRBs: happy 2022 to all GCN readers!

M3 - Journal article

JO - GRB Coordinates Network, Circular Service

JF - GRB Coordinates Network, Circular Service

IS - 31359

ER -