An inverse Compton origin for the 55 GeV photon in the late afterglow of GRB 130907A
Abstract
The extended high-energy gamma-ray (>100 MeV) emission which occurs well after the prompt gamma-ray bursts (GRBs) is usually explained as the afterglow synchrotron radiation. Here we report the analysis of Fermi Large Area Telescope observations of GRB 130907A. A 55 GeV photon compatible with the position of the burst was found about 5 hr after the prompt phase. The probability that this photon is associated with GRB 130907A is higher than 99.96%. The energy of this photon exceeds the maximum synchrotron photon energy at this time and its occurrence thus challenges the synchrotron mechanism as the origin for the extended high-energy >10 GeV emission. Modeling of the broadband spectral energy distribution suggests that such high energy photons can be produced by the synchrotron self-Compton emission of the afterglow.
- Authors:
-
- School of Astronomy and Space Science, Nanjing University, Nanjing 210093 (China)
- Publication Date:
- OSTI Identifier:
- 22356584
- Resource Type:
- Journal Article
- Journal Name:
- Astrophysical Journal
- Additional Journal Information:
- Journal Volume: 788; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0004-637X
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; AFTERGLOW; COSMIC GAMMA BURSTS; EMISSION; ENERGY SPECTRA; GAMMA RADIATION; GEV RANGE; MEV RANGE; PHOTONS; PROBABILITY; SIMULATION; SYNCHROTRON RADIATION
Citation Formats
Tang, Qing-Wen, Wang, Xiang-Yu, and Tam, Pak-Hin Thomas, E-mail: xywang@nju.edu.cn, E-mail: phtam@phys.nthu.edu.tw. An inverse Compton origin for the 55 GeV photon in the late afterglow of GRB 130907A. United States: N. p., 2014.
Web. doi:10.1088/0004-637X/788/2/156.
Tang, Qing-Wen, Wang, Xiang-Yu, & Tam, Pak-Hin Thomas, E-mail: xywang@nju.edu.cn, E-mail: phtam@phys.nthu.edu.tw. An inverse Compton origin for the 55 GeV photon in the late afterglow of GRB 130907A. United States. https://doi.org/10.1088/0004-637X/788/2/156
Tang, Qing-Wen, Wang, Xiang-Yu, and Tam, Pak-Hin Thomas, E-mail: xywang@nju.edu.cn, E-mail: phtam@phys.nthu.edu.tw. 2014.
"An inverse Compton origin for the 55 GeV photon in the late afterglow of GRB 130907A". United States. https://doi.org/10.1088/0004-637X/788/2/156.
@article{osti_22356584,
title = {An inverse Compton origin for the 55 GeV photon in the late afterglow of GRB 130907A},
author = {Tang, Qing-Wen and Wang, Xiang-Yu and Tam, Pak-Hin Thomas, E-mail: xywang@nju.edu.cn, E-mail: phtam@phys.nthu.edu.tw},
abstractNote = {The extended high-energy gamma-ray (>100 MeV) emission which occurs well after the prompt gamma-ray bursts (GRBs) is usually explained as the afterglow synchrotron radiation. Here we report the analysis of Fermi Large Area Telescope observations of GRB 130907A. A 55 GeV photon compatible with the position of the burst was found about 5 hr after the prompt phase. The probability that this photon is associated with GRB 130907A is higher than 99.96%. The energy of this photon exceeds the maximum synchrotron photon energy at this time and its occurrence thus challenges the synchrotron mechanism as the origin for the extended high-energy >10 GeV emission. Modeling of the broadband spectral energy distribution suggests that such high energy photons can be produced by the synchrotron self-Compton emission of the afterglow.},
doi = {10.1088/0004-637X/788/2/156},
url = {https://www.osti.gov/biblio/22356584},
journal = {Astrophysical Journal},
issn = {0004-637X},
number = 2,
volume = 788,
place = {United States},
year = {Fri Jun 20 00:00:00 EDT 2014},
month = {Fri Jun 20 00:00:00 EDT 2014}
}