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Multiwavelength observations of the energetic GRB 080810: detailed mapping of the broad-band spectral evolution star

Page, KL and Willingale, R and Bissaldi, E and de Ugarte Postigo, A and Holland, ST and McBreen, S and O'Brien, PT and Osborne, JP and Prochaska, JX and Rol, E and Rykoff, ES and Starling, RLC and Tanvir, NR and van der Horst, AJ and Wiersema, K and Zhang, B and Aceituno, FJ and Akerlof, C and Beardmore, AP and Briggs, MS and Burrows, DN and Castro-Tirado, AJ and Connaughton, V and Evans, PA and Fynbo, JPU and Gehrels, N and Guidorzi, C and Howard, AW and Kennea, JA and Kouveliotou, C and Pagani, C and Preece, R and Perley, DA and Steele, IA and Yuan, F (2009) Multiwavelength observations of the energetic GRB 080810: detailed mapping of the broad-band spectral evolution star. Monthly Notices of the Royal Astronomical Society, 400 (1). pp. 134-146. ISSN 0035-8711

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Abstract

GRB 080810 was one of the first bursts to trigger both Swift and the Fermi Gamma-ray Space Telescope. It was subsequently monitored over the X-ray and UV/optical bands by Swift, in the optical by Robotic Optical Transient Search Experiment (ROTSE) and a host of other telescopes, and was detected in the radio by the Very Large Array. The redshift of z= 3.355 ± 0.005 was determined by Keck/High Resolution Echelle Spectrometer (HIRES) and confirmed by RTT150 and NOT. The prompt gamma/X-ray emission, detected over 0.3–103 keV, systematically softens over time, with Epeak moving from ∼600 keV at the start to ∼40 keV around 100 s after the trigger; alternatively, this spectral evolution could be identified with the blackbody temperature of a quasi-thermal model shifting from ∼60 to ∼3 keV over the same time interval. The first optical detection was made at 38 s, but the smooth, featureless profile of the full optical coverage implies that this is originated from the afterglow component, not from the pulsed/flaring prompt emission.

Broad-band optical and X-ray coverage of the afterglow at the start of the final X-ray decay (∼8 ks) reveals a spectral break between the optical and X-ray bands in the range of 1015–2 × 1016 Hz. The decay profiles of the X-ray and optical bands show that this break initially migrates blueward to this frequency and then subsequently drifts redward to below the optical band by ∼3 × 105 s. GRB 080810 was very energetic, with an isotropic energy output for the prompt component of 3 × 1053 and 1.6 × 1052 erg for the afterglow; there is no evidence for a jet break in the afterglow up to 6 d following the burst.

Item Type: Article
Additional Information: This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2009 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Uncontrolled Keywords: 0201 Astronomical And Space Sciences
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Divisions: Astrophysics Research Institute
Publisher: Oxford University Press
Related URLs:
Date Deposited: 09 Feb 2017 10:57
Last Modified: 09 Feb 2017 10:57
DOI or Identification number: 10.1111/j.1365-2966.2009.15462.x
URI: http://researchonline.ljmu.ac.uk/id/eprint/5487

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