Affiliation:
1. Department of Physics and Astronomy, University of Leicester, University Road, Leicester LE1 7RH, UK
2. Department of Physics, University of Warwick, Coventry CV4 7AL, UK
3. Department of Astrophysics/IMAPP, Radboud University, Nijmegen, The Netherlands
4. The Oskar Klein Centre, Department of Astronomy, AlbaNova, Stockholm University, SE-106 91 Stockholm, Sweden
Abstract
ABSTRACT
We present X-ray and optical observations of the short duration gamma-ray burst GRB 071227 and its host at z = 0.381, obtained using Swift, Gemini South, and the Very Large Telescope. We identify a short-lived and moderately bright optical transient, with flux significantly in excess of that expected from a simple extrapolation of the X-ray spectrum at 0.2–0.3 d after burst. We fit the SED with afterglow models allowing for high extinction and thermal emission models that approximate a kilonova to assess the excess’ origins. While some kilonova contribution is plausible, it is not favoured due to the low temperature and high luminosity required, implying superluminal expansion and a large ejecta mass of ∼0.1 M$\odot$. We find, instead, that the transient is broadly consistent with power-law spectra with additional dust extinction of E(B − V) ∼ 0.4 mag, although a possibly thermal excess remains in the z band. We investigate the host, a spiral galaxy with an edge-on orientation, resolving its spectrum along its major axis to construct the galaxy rotation curve and analyse the star formation and chemical properties. The integrated host emission shows evidence for high extinction, consistent with the afterglow findings. The metallicity and extinction are consistent with previous studies of this host and indicate the galaxy is a typical, but dusty, late-type SGRB host.
Funder
National Science Foundation
National Research Council
Consejo Nacional de Innovación, Ciencia y Tecnología
Ministerio de Ciencia, Tecnología e Innovación Productiva
Ministério da Ciência, Tecnologia e Inovação
European Southern Observatory
Australian Research Council
University of Sydney
Australian National University
Swinburne University of Technology
University of Queensland
University of Western Australia
University of Melbourne
Curtin University of Technology
Australian Astronomical Observatory
National Computational Infrastructure
Astronomy Australia Limited
American Association of Immunologists
Australian National Data Service
Science and Technology Facilities Council
European Research Council
Swedish Research Council
Swedish National Space Board
Publisher
Oxford University Press (OUP)
Subject
Space and Planetary Science,Astronomy and Astrophysics
Cited by
2 articles.
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1. A multimessenger model for neutron star–black hole mergers;Monthly Notices of the Royal Astronomical Society;2023-10-03
2. OUP accepted manuscript;Monthly Notices of the Royal Astronomical Society;2021