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Title: Fermi/GAMMA-RAY BURST MONITOR OBSERVATIONS OF SGR J0501+4516 BURSTS

Abstract

We present our temporal and spectral analyses of 29 bursts from SGR J0501+4516, detected with the gamma-ray burst monitor on board the Fermi Gamma-ray Space Telescope during 13 days of the source's activation in 2008 (August 22- September 3). We find that the T{sub 90} durations of the bursts can be fit with a log-normal distribution with a mean value of {approx}123 ms. We also estimate for the first time event durations of soft gamma repeater (SGR) bursts in photon space (i.e., using their deconvolved spectra) and find that these are very similar to the T{sub 90} values estimated in count space (following a log-normal distribution with a mean value of {approx}124 ms). We fit the time-integrated spectra for each burst and the time-resolved spectra of the five brightest bursts with several models. We find that a single power law with an exponential cutoff model fits all 29 bursts well, while 18 of the events can also be fit with two blackbody functions. We expand on the physical interpretation of these two models and we compare their parameters and discuss their evolution. We show that the time-integrated and time-resolved spectra reveal that E{sub peak} decreases with energy flux (and fluence)more » to a minimum of {approx}30 keV at F = 8.7 x 10{sup -6} erg cm{sup -2} s{sup -1}, increasing steadily afterward. Two more sources exhibit a similar trend: SGRs J1550-5418 and 1806-20. The isotropic luminosity, L{sub iso}, corresponding to these flux values is roughly similar for all sources (0.4-1.5 x 10{sup 40} erg s{sup -1}).« less

Authors:
;  [1];  [2];  [3]; ;  [4]; ; ; ;  [5];  [6]; ;  [7];  [8];  [9];  [10]; ;  [11]; ;  [12]
  1. National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012 (China)
  2. Space Science Office, VP62, NASA/Marshall Space Flight Center, Huntsville, AL 35812 (United States)
  3. Department of Physics and Astronomy, Rice University, Houston, TX 77251 (United States)
  4. NSSTC, Universities Space Research Association, Huntsville, AL 35805 (United States)
  5. CSPAR, University of Alabama in Huntsville, Huntsville, AL 35805 (United States)
  6. Corvid Technologies, Huntsville, AL 35806 (United States)
  7. Faculty of Engineering and Natural Sciences, Sabanci University, Orhanli- Tuzla, Istanbul 34956 (Turkey)
  8. Space Science and Astrobiology Division, NASA/Ames Research Center, Moffett Field, CA 94035-1000 (United States)
  9. Centre for Astrophysics Research, University of Hertfordshire, Hatfield, Herts, AL10 9AB (United Kingdom)
  10. Max Planck Institute for extraterrestrial Physics, 85748 Garching (Germany)
  11. Astronomical Institute 'Anton Pannekoek', University of Amsterdam, Postbus 94249, 1090 GE Amsterdam (Netherlands)
  12. NASA Goddard Space Flight Center, Greenbelt, MD 20771 (United States)
Publication Date:
OSTI Identifier:
21587471
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal
Additional Journal Information:
Journal Volume: 739; Journal Issue: 2; Other Information: DOI: 10.1088/0004-637X/739/2/87; 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; COSMIC GAMMA BURSTS; MONITORS; PULSARS; COSMIC RADIATION; COSMIC RADIO SOURCES; IONIZING RADIATIONS; MEASURING INSTRUMENTS; PRIMARY COSMIC RADIATION; RADIATIONS

Citation Formats

Lin Lin, Zhang Shuangnan, Kouveliotou, Chryssa, Baring, Matthew G., Van der Horst, Alexander J., Finger, Mark H., Guiriec, Sylvain, Preece, Robert, Chaplin, Vandiver, Bhat, Narayan, Woods, Peter M., Goegues, Ersin, Kaneko, Yuki, Scargle, Jeffrey, Granot, Jonathan, Von Kienlin, Andreas, Watts, Anna L., Wijers, Ralph A. M. J., Gehrels, Neil, and Harding, Alice, E-mail: lin.lin@uah.edu. Fermi/GAMMA-RAY BURST MONITOR OBSERVATIONS OF SGR J0501+4516 BURSTS. United States: N. p., 2011. Web. doi:10.1088/0004-637X/739/2/87; COUNTRY OF INPUT: INTERNATIONAL ATOMIC ENERGY AGENCY (IAEA).
Lin Lin, Zhang Shuangnan, Kouveliotou, Chryssa, Baring, Matthew G., Van der Horst, Alexander J., Finger, Mark H., Guiriec, Sylvain, Preece, Robert, Chaplin, Vandiver, Bhat, Narayan, Woods, Peter M., Goegues, Ersin, Kaneko, Yuki, Scargle, Jeffrey, Granot, Jonathan, Von Kienlin, Andreas, Watts, Anna L., Wijers, Ralph A. M. J., Gehrels, Neil, & Harding, Alice, E-mail: lin.lin@uah.edu. Fermi/GAMMA-RAY BURST MONITOR OBSERVATIONS OF SGR J0501+4516 BURSTS. United States. doi:10.1088/0004-637X/739/2/87; COUNTRY OF INPUT: INTERNATIONAL ATOMIC ENERGY AGENCY (IAEA).
Lin Lin, Zhang Shuangnan, Kouveliotou, Chryssa, Baring, Matthew G., Van der Horst, Alexander J., Finger, Mark H., Guiriec, Sylvain, Preece, Robert, Chaplin, Vandiver, Bhat, Narayan, Woods, Peter M., Goegues, Ersin, Kaneko, Yuki, Scargle, Jeffrey, Granot, Jonathan, Von Kienlin, Andreas, Watts, Anna L., Wijers, Ralph A. M. J., Gehrels, Neil, and Harding, Alice, E-mail: lin.lin@uah.edu. Sat . "Fermi/GAMMA-RAY BURST MONITOR OBSERVATIONS OF SGR J0501+4516 BURSTS". United States. doi:10.1088/0004-637X/739/2/87; COUNTRY OF INPUT: INTERNATIONAL ATOMIC ENERGY AGENCY (IAEA).
@article{osti_21587471,
title = {Fermi/GAMMA-RAY BURST MONITOR OBSERVATIONS OF SGR J0501+4516 BURSTS},
author = {Lin Lin and Zhang Shuangnan and Kouveliotou, Chryssa and Baring, Matthew G. and Van der Horst, Alexander J. and Finger, Mark H. and Guiriec, Sylvain and Preece, Robert and Chaplin, Vandiver and Bhat, Narayan and Woods, Peter M. and Goegues, Ersin and Kaneko, Yuki and Scargle, Jeffrey and Granot, Jonathan and Von Kienlin, Andreas and Watts, Anna L. and Wijers, Ralph A. M. J. and Gehrels, Neil and Harding, Alice, E-mail: lin.lin@uah.edu},
abstractNote = {We present our temporal and spectral analyses of 29 bursts from SGR J0501+4516, detected with the gamma-ray burst monitor on board the Fermi Gamma-ray Space Telescope during 13 days of the source's activation in 2008 (August 22- September 3). We find that the T{sub 90} durations of the bursts can be fit with a log-normal distribution with a mean value of {approx}123 ms. We also estimate for the first time event durations of soft gamma repeater (SGR) bursts in photon space (i.e., using their deconvolved spectra) and find that these are very similar to the T{sub 90} values estimated in count space (following a log-normal distribution with a mean value of {approx}124 ms). We fit the time-integrated spectra for each burst and the time-resolved spectra of the five brightest bursts with several models. We find that a single power law with an exponential cutoff model fits all 29 bursts well, while 18 of the events can also be fit with two blackbody functions. We expand on the physical interpretation of these two models and we compare their parameters and discuss their evolution. We show that the time-integrated and time-resolved spectra reveal that E{sub peak} decreases with energy flux (and fluence) to a minimum of {approx}30 keV at F = 8.7 x 10{sup -6} erg cm{sup -2} s{sup -1}, increasing steadily afterward. Two more sources exhibit a similar trend: SGRs J1550-5418 and 1806-20. The isotropic luminosity, L{sub iso}, corresponding to these flux values is roughly similar for all sources (0.4-1.5 x 10{sup 40} erg s{sup -1}).},
doi = {10.1088/0004-637X/739/2/87; COUNTRY OF INPUT: INTERNATIONAL ATOMIC ENERGY AGENCY (IAEA)},
journal = {Astrophysical Journal},
issn = {0004-637X},
number = 2,
volume = 739,
place = {United States},
year = {2011},
month = {10}
}