Volume 616, August 2018
|Number of page(s)||15|
|Published online||11 September 2018|
The second-closest gamma-ray burst: sub-luminous GRB 111005A with no supernova in a super-solar metallicity environment
Astronomical Observatory Institute, Faculty of Physics, Adam Mickiewicz University, ul. Słoneczna 36, 60-286 Poznań, Poland
2 Scottish Universities Physics Alliance (SUPA), Institute for Astronomy, University of Edinburgh, Royal Observatory, Blackford Hill, Edinburgh EH9 3HJ, UK
3 Dark Cosmology Centre, Niels Bohr Institute, University of Copenhagen, Juliane Maries Vej 30, 2100 Copenhagen Ø, Denmark
4 National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, PR China
5 CSIRO Astronomy and Space Science, Locked Bag 194, Narrabri, NSW 2390, Australia
6 Department of Physics, University of Warwick, Coventry CV4 7AL, UK
7 Department of Earth and Space Sciences, Chalmers University of Technology, Onsala Space Observatory, 43992 Onsala, Sweden
8 Joint Institute for VLBI ERIC, Postbus 2, 7990 AA Dwingeloo, The Netherlands
9 Harvard-Smithsonian Center for Astrophysics, 60 Garden St., Cambridge, MA 02138, USA
10 Instituto de Astrofísica de Canarias (IAC), 38205 La Laguna, Tenerife, Spain
11 Universidad de La Laguna, Dpto. Astrofísica, 38206 La Laguna, Tenerife, Spain
12 Universität Wien, Institut für Astrophysik, Türkenstraße 17, 1180 Wien, Austria
13 Department of Physics, The George Washington University, 725 21st Street NW, Washington, DC 20052, USA
14 Department of Space Sciences and Astronomy, Hebei Normal University, Shijiazhuang 050024, PR China
15 Key Laboratory of Dark Matter and Space Astronomy, Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210008, PR China
16 Sterrenkundig Observatorium, Universiteit Gent, Krijgslaan 281-S9, 9000 Gent, Belgium
17 Department of Physics and Astrophysics, Vrije Universiteit Brussel, Pleinlaan 2, 1050 Brussels, Belgium
18 Department of Physics and Astronomy, University of Leicester, Leicester LE1 7RH, UK
19 Astronomisches Institut, Ruhr-Universität Bochum, Universitätsstrasse 150, 44801 Bochum, Germany
20 Jodrell Bank Centre for Astrophysics, School of Physics & Astronomy, The University of Manchester, Alan Turing Building, Oxford Road, Manchester M13 9PL, UK
21 Leiden Observatory, University of Leiden, PO Box 9513, 2300 RA Leiden, The Netherlands
Accepted: 26 May 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.
Key words: dust, extinction / galaxies: abundances / galaxies: individual: ESO 580-49 / galaxies: star formation / gamma-ray burst: general / gamma-ray burst: individual: 111005A
© ESO 2018
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