GRB060614: a "fake" short GRB from a merging binary system

Abstract

(Shortened) CONTEXT: [...] GRB060614 is the first nearby long duration GRB clearly not associated to a bright Ib/c supernova. Moreover, its duration (T_{90} ~ 100s) makes it hardly classifiable as a short GRB. It presents strong similarities with GRB970228, the prototype of the new class of "fake" short GRBs that appear to originate from the coalescence of binary neutron stars or white dwarfs spiraled out into the galactic halo. AIMS: Within the "canonical" GRB scenario based on the "fireshell" model, we test if GRB060614 can be a "fake" or "disguised" short GRB. [...] METHODS: We fit GRB060614 light curves in Swift's BAT (15-150keV) and XRT (0.2-10keV) energy bands. Within the fireshell model, light curves are formed by two well defined and different components: the Proper-GRB (P-GRB), emitted at the fireshell transparency, and the extended afterglow, due to the interaction between the leftover accelerated baryonic and leptonic shell and the CBM. RESULTS: We determine the two free parameters describing the GRB source within the fireshell model. [...] A small average CBM density [...] is inferred, typical of galactic halos. The first spikelike emission is identified with the P-GRB and the following prolonged emission with the extended afterglow peak.[...] CONCLUSIONS: The anomalous GRB060614 finds a natural interpretation within our canonical GRB scenario: it is a "disguised" short GRB. [...] This result points to an old binary system, likely formed by a white dwarf and a neutron star, as the progenitor of GRB060614 and well justify the absence of an associated SN Ib/c. Particularly important for further studies of the final merging process are the temporal structures in the P-GRB down to 0.1s.

7 pages, 5 figures, to appear on Astronomy & Astrophysics. This new version fixes a typo in one label of Fig. 3

References in corpus (47)

• Spectra and Light Curves of Gamma-Ray Burst Afterglows
• The Physics of Gamma-Ray Bursts
• The Supernova -- Gamma-Ray Burst Connection
• Unsteady Outflow Models for Cosmological Gamma-Ray Bursts
• Optical and Long Wavelength Afterglow from Gamma-Ray Bursts
• Gamma-Ray Bursts
• Physical processes shaping GRB X-ray afterglow lightcurves: theoretical implications from the Swift XRT observations
• Discovery of the X-Ray Afterglow of the Gamma-Ray Burst of February 28 1997
• Swift detects a remarkable gamma-ray burst, GRB 060614, that introduces a new classification scheme
• An optical supernova associated with the X-ray flash XRF 060218
• The Ep,i - Eiso correlation in GRBs: updated observational status, re-analysis and main implications
• Short Gamma-Ray Bursts with Extended Emission
• No supernovae associated with two long-duration gamma ray bursts
• An enigmatic long-lasting gamma-ray burst not accompanied by a bright supernova
• The Galaxy Population Hosting Gamma-Ray Bursts
• The gamma-ray burst GRB060614 requires a novel explosive process
• Low Luminosity Gamma-Ray Bursts as a Unique Population: Luminosity Function, Local Rate, and Beaming Factor
• Testing the standard fireball model of GRBs using late X-ray afterglows measured by Swift
• Making a Short Gamma-Ray Burst from a Long one: Implications for the Nature of GRB 060614
• The sub-energetic GRB 031203 as a cosmic analogue to GRB 980425
• The optical counterpart to gamma-ray burst GRB970228 observed using the Hubble Space Telescope
• Swift observations of the X-ray bright GRB 050315
• SN 2006aj and the nature of low-luminosity gamma-ray bursts
• The Host Galaxies of Short-Duration Gamma-Ray Bursts: Luminosities, Metallicities, and Star Formation Rates
• Swift observations of GRB 060614: an anomalous burst with a well behaved afterglow
• Absolute-Magnitude Distributions and Light Curves of Stripped-Envelope Supernovae
• On the consistency of the peculiar GRBs 060218 and 060614 with the Ep,i - Eiso correlation
• On the interpretation of the burst structure of GRBs
• A general scheme for modeling gamma-ray burst prompt emission
• SN 2006aj Associated with XRF 060218 At Late Phases: Nucleosynthesis-Signature of A Neutron Star-Driven Explosion
• On a possible GRB-supernova time sequence
• Thermalization of a nonequilibrium electron-positron-photon plasma
• Relative space-time transformations in GRBs
• On the exact analytic expressions for the equitemporal surfaces in Gamma-Ray Burst afterglows
• On the structures in the afterglow peak emission of gamma ray bursts
• On the instantaneous spectrum of Gamma-Ray Bursts
• GRB970228 and a class of GRBs with an initial spikelike emission
• Theoretical interpretation of luminosity and spectral properties of GRB 031203
• GRB060218 and GRBs associated with Supernovae Ib/c
• Emergence of a filamentary structure in the fireball from GRB spectra
• Observational signatures of an electromagnetic overcritical gravitational collapse
• The Amati relation in the "fireshell" model
• The "fireshell" model and the "canonical" GRB scenario
• Short and canonical GRBs
• Progenitors of Long Gamma-ray Bursts
• The canonical Gamma-Ray Bursts and their "precursors"
• Theoretical interpretation of GRB060124: preliminary results

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• A possible Macronova in the late afterglow of the `long-short' burst GRB 060614
• The Afterglows of Swift-era Gamma-Ray Bursts II.: Type I GRB versus Type II GRB Optical Afterglows
• An updated Gamma Ray Bursts Hubble diagram
• On the Induced Gravitational Collapse of a Neutron Star to a Black Hole by a Type Ib/c Supernova
• On the classification of GRBs and their occurrence rates
• Gamma Ray Burst afterglow and prompt-afterglow relations: an overview
• The merger of binary white dwarf-neutron stars: Simulations in full general relativity
• A double component in GRB 090618: a proto-black hole and a genuinely long GRB
• Host Galaxies of Type Ic and Broad-lined Type Ic Supernovae from the Palomar Transient Factory: Implication for Jet Production
• Early X-ray Flares in GRBs
• Binary population synthesis models for core-collapse gamma-ray burst progenitors
• GRB 090618: The First Example of a Neutron Star Gravitational Collapse to a Black Hole Induced by a Type Ib/c Supernova
• Measuring the Hubble Constant with a sample of kilonovae
• Evidence for a proto-black hole and a double astrophysical component in GRB 101023
• On the origin of short GRBs with Extended Emission and long GRBs without associated SN
• GRB 090227B: the missing link between the genuine short and long GRBs
• Novel distance indicator for gamma-ray bursts associated with supernovae
• GRB 071227: an additional case of a disguised short burst
• Analysis of GRB 080319B and GRB 050904 within the fireshell model: evidence for a broader spectral energy distribution
• GRB 100418A: a Long GRB without a Bright Supernova in a High-Metallicity Host Galaxy
• GRB 170817A-GW170817-AT 2017gfo and the observations of NS-NS, NS-WD and WD-WD mergers
• The Revival of White Holes as Small Bangs
• On the Environment of Short Gamma-ray Bursts
• On the rate and on the gravitational wave emission of short and long GRBs
• Prospects for multi-messenger extended emission from core-collapse supernovae in the Local Universe
• GRB-SN Association within the Binary-Driven Hypernova Model
• Induced Gravitational Collapse, Binary-Driven Hypernovae, Long Gramma-ray Bursts and Their Connection with Short Gamma-ray Bursts
• Update on the GRB universal scaling E${}_{\mathrm{X},\mathrm{iso}}$-E${}_{\gamma ,\mathrm{iso}}$-E${}_{\mathrm{pk}}$ with ten years of $Swift$ data
• Electromagnetic priors for black hole spindown in searches for gravitational-waves from supernovae and long GRBs
• On the nature of GRB 050509b: a disguised short GRB
• Fundamental physics from black holes, neutron stars and gamma-ray bursts
• Gravitational Waves versus X and Gamma Ray Emission in a Short Gamma-Ray Burst
• Prospects for true calorimetry on Kerr black holes in core-collapse supernovae and mergers
• GRB 090510: a disguised short GRB with the highest Lorentz factor and circumburst medium
• Multiple Components in the Broadband $\gamma$-ray Emission of the Short GRB 160709A