Identification and properties of the photospheric emission in GRB090902B

Ryde, F.; Axelsson, M.; Zhang, B. B.; McGlynn, S.; Pe'er, A.; Lundman, C.; Larsson, S.; Battelino, M.; Zhang, B.; Bissaldi, E.; Bregeon, J.; Briggs, M. S.; Chiang, J.; de Palma, F.; Guiriec, S.; Larsson, J.; Longo, F.; McBreen, S.; Omodei, N.; Petrosian, V.; Preece, R.; van der Horst, A. J.

doi:10.1088/2041-8205/709/2/L172

Title: Identification and properties of the photospheric emission in GRB090902B

Journal Article · Thu Jan 14 00:00:00 EST 2010 · The Astrophysical Journal. Letters

DOI:https://doi.org/10.1088/2041-8205/709/2/L172· OSTI ID:1357583

Ryde, F. ^[1]; Axelsson, M. ^[2]; Zhang, B. B. ^[3]; McGlynn, S. ^[1]; Pe'er, A. ^[4]; Lundman, C. ^[1]; Larsson, S. ^[5]; Battelino, M. ^[1]; Zhang, B. ^[3]; Bissaldi, E. ^[6]; Bregeon, J. ^[7]; Briggs, M. S. ^[8]; Chiang, J. ^[9]; de Palma, F. ^[10]; Guiriec, S. ^[8]; Larsson, J. ^[2]; Longo, F. ^[11]; McBreen, S. ^[12]; Omodei, N. ^[13]; Petrosian, V. ^[14] more »

KTH Royal Inst. of Technology, Stockholm (Sweden). Dept. of Physics; Oskar Klein Centre for Cosmoparticle Physics, Stockholm (Sweden)
Oskar Klein Centre for Cosmoparticle Physics, Stockholm (Sweden).; Stockholm Univ. (Sweden). Dept. of Astronomy
Univ. of Nevada, Las Vegas, NV (United States). Dept. of Physics and Astronomy
Space Telescope Science Inst., Baltimore, MD (United States)
Oskar Klein Centre for Cosmoparticle Physics, Stockholm (Sweden); Stockholm Univ. (Sweden). Dept. of Physics
Max Planck Inst. for Extraterrestrial Physics, Garching (Germany)
National Inst. of Nuclear Physics, Pisa (Italy)
Univ. of Alabama, Huntsville, AL (United States). Center for Space Plasma and Aeronomic Research (CSPAR)
Stanford Univ. and SLAC National Accelerator Lab., CA (United States). Kavli Inst. for Particle Astrophysics and Cosmology
Polytechnic Univ. of Bari (Italy). Dept. of Physics; National Inst. of Nuclear Physics, Bari (Italy)
National Inst. of Nuclear Physics, Trieste (Italy); Univ. of Trieste (Italy). Dept. of Physics
Max Planck Inst. for Extraterrestrial Physics, Garching (Germany); Univ. of College, Dublin (Ireland)
National Inst. of Nuclear Physics, Bari (Italy)
Stanford Univ., CA (United States). Center for Space Science and Astrophysics
NASA Marshall Space Flight Center (MSFC), Huntsville, AL (United States)

We observed the Fermi Gamma-ray Space Telescope using the bright and long GRB090902B, lying at a redshift of z = 1.822. Together the Large Area Telescope (LAT) and the Gamma-ray Burst Monitor (GBM) cover the spectral range from 8 keV to >300 GeV. Here we show that the prompt burst spectrum is consistent with emission from the jet photosphere combined with nonthermal emission described by a single power law with photon index –1.9. The photosphere gives rise to a strong quasi-blackbody spectrum which is somewhat broader than a single Planck function and has a characteristic temperature of ~290 keV. We model the photospheric emission with a multicolor blackbody, and its shape indicates that the photospheric radius increases at higher latitudes. We derive the averaged photospheric radius R _ph = (1.1 ± 0.3) × 10¹² Y^1/4 cm and the bulk Lorentz factor of the flow, which is found to vary by a factor of 2 and has a maximal value of Γ = 750 Y ^1/4. Here, Y is the ratio between the total fireball energy and the energy emitted in the gamma rays. Here, we find that during the first quarter of the prompt phase the photospheric emission dominates, which explains the delayed onset of the observed flux in the LAT compared to the GBM. We also interpret the broadband emission as synchrotron emission at R ~ 4 × 10¹⁵ cm. Our analysis emphasizes the importance of having high temporal resolution when performing spectral analysis on gamma-ray bursts, since there is strong spectral evolution.

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Research Organization:: SLAC National Accelerator Lab., Menlo Park, CA (United States)

Sponsoring Organization:: USDOE

Contributing Organization:: Fermi LAT Collaboration

Grant/Contract Number:: AC02-76SF00515

OSTI ID:: 1357583

Journal Information:: The Astrophysical Journal. Letters, Vol. 709, Issue 2; ISSN 2041-8205

Publisher:: Institute of Physics (IOP)Copyright Statement

Country of Publication:: United States

Language:: English

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References (41)

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gamma-ray burst: individual (GRB090902B)
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Title: Identification and properties of the photospheric emission in GRB090902B

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