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A detailed spectral study of GRB 041219A and its host galaxy

Abstract : GRB 041219A is one of the longest and brightest gamma-ray bursts (GRBs) ever observed. It was discovered by the INTEGRAL satellite, and thanks to a precursor happening about 300 s before the bulk of the burst, ground-based telescopes were able to catch the rarely observed prompt emission in the optical and in the near-infrared bands.

Here we present the detailed analysis of its prompt gamma-ray emission, as observed with IBIS onboard INTEGRAL, and of the available X-ray afterglow data collected by X-Ray Telescope onboard Swift. We then present the late-time multiband near-infrared imaging data, collected at the Telescopio Nazionale Galileo (TNG) and the Canada-France-Hawaii Telescope (CFHT), that allowed us to identify the host galaxy of the GRB as an underluminous, irregular galaxy of ∼5 × 109 M at best-fitting redshift of z= 0.31+0.54-0.26.

We model the broad-band prompt optical to gamma-ray emission of GRB 041219A within the internal shock model. We were able to reproduce the spectra and light curve invoking the synchrotron emission of relativistic electrons accelerated by a series of propagating shock waves inside a relativistic outflow. On the other hand, it is less easy to simultaneously reproduce the temporal and spectral properties of the infrared data.

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Submitted on : Thursday, April 21, 2022 - 3:34:20 PM
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D. Götz, S. Covino, R. Hascoët, A. Fernandez-Soto, F. Daigne, et al.. A detailed spectral study of GRB 041219A and its host galaxy. Monthly Notices of the Royal Astronomical Society, Oxford University Press (OUP): Policy P - Oxford Open Option A, 2011, 413, pp.2173-2183. ⟨10.1111/j.1365-2966.2011.18290.x⟩. ⟨insu-03645983⟩

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