The second-closest gamma-ray burst: Sub-luminous GRB 111005A with no supernova in a super-solar metallicity environment
Artikel i vetenskaplig tidskrift, 2018

We report the detection of the radio afterglow of a long gamma-ray burst (GRB) 111005A at 5-345 GHz, including very long baseline interferometry observations with a positional error of 0.2 mas. The afterglow position is coincident with the disc of a galaxy ESO 58049 at z = 0.01326 (∼1″ from its centre), which makes GRB 111005A the second-closest GRB known to date, after GRB 980425. The radio afterglow of GRB 111005A was an order of magnitude less luminous than those of local low-luminosity GRBs, and obviously less luminous than those of cosmological GRBs. The radio flux was approximately constant and then experienced an unusually rapid decay a month after the GRB explosion. Similarly to only two other GRBs, we did not find the associated supernovae (SNe), despite deep near- and mid-infrared observations 1-9 days after the GRB explosion, reaching ∼20 times fainter than other SNe associated with GRBs. Moreover, we measured a twice-solar metallicity for the GRB location. The low y-ray and radio luminosities, rapid decay, lack of a SN, and super-solar metallicity suggest that GRB 111005A represents a rare class of GRB that is different from typical core-collapse events. We modelled the spectral energy distribution of the GRB 111005A host finding that it is a moderately star-forming dwarf galaxy, similar to the host of GRB 980425. The existence of two local GRBs in such galaxies is still consistent with the hypothesis that the GRB rate is proportional to the cosmic star formation rate (SFR) density, but suggests that the GRB rate is biased towards low SFRs. Using the far-infrared detection of ESO 580-49, we conclude that the hosts of both GRBs 111005A and 980425 exhibit lower dust content than what would be expected from their stellar masses and optical colors.

Galaxies: star formation

Galaxies: individual: ESO 580-49

Galaxies: abundances

Gamma-ray burst: general

Gamma-ray burst: individual: 111005A

Dust, extinction


M. J. Michalowski

University of Edinburgh

Uniwersytet im. Adama Mickiewicza w Poznaniu

Dong Xu

University of Edinburgh

Chinese Academy of Sciences

J. Stevens

CSIRO Astronomy and Space Science

Andrew Levan

The University of Warwick

Jun Yang

Joint Institute for VLBI in Europe (JIVE)

Chalmers, Rymd-, geo- och miljövetenskap, Onsala rymdobservatorium, Onsala rymdobservatorium, Observationssupport

Z. Paragi

Joint Institute for VLBI in Europe (JIVE)

Atish Kamble

Harvard-Smithsonian Center for Astrophysics

An Li Tsai

Uniwersytet im. Adama Mickiewicza w Poznaniu

H. Dannerbauer

Universidad de la Laguna

Instituto Astrofisico de Canarias

Universität Wien

A. J. van der Horst

George Washington University

Lang Shao

Chinese Academy of Sciences

Hebei Normal University

David Crosby

University of Edinburgh

Gianfranco Gentile

Vrije Universiteit Brüssel (VUB)

Universiteit Gent

Elizabeth Stanway

The University of Warwick

K. Wiersema

University Of Leicester

The University of Warwick

Johan P.U. Fynbo

Niels Bohr Institute

Nial R. Tanvir

University Of Leicester

Peter Kamphuis

Ruhr-Universität Bochum

M. A. Garrett

Universiteit Leiden

University of Manchester

Przemysław Bartczak

Uniwersytet im. Adama Mickiewicza w Poznaniu

Astronomy and Astrophysics

0004-6361 (ISSN) 1432-0746 (eISSN)

Vol. 616 A169


Subatomär fysik

Astronomi, astrofysik och kosmologi

Atom- och molekylfysik och optik


Onsala rymdobservatorium



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