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Fermi/GBM Observations of SGRJ0501 + 4516 BurstsWe present our temporal and spectral analyses of 29 bursts from SGRJ0501+4516, detected with the Gamma-ray Burst Monitor onboard the Fermi Gamma-ray Space Telescope during the 13 days of the source activation in 2008 (August 22 to 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)s 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 black body 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(exp -6)erg/sq cm/s, increasing steadily afterwards. 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 - l.5 x 10(exp 40) erg/s.
Document ID
20120001983
Acquisition Source
Goddard Space Flight Center
Document Type
Reprint (Version printed in journal)
Authors
Lin, Lin (Alabama Univ. Huntsville, AL, United States)
Kouveliotou, Chryssa (NASA Marshall Space Flight Center Huntsville, AL, United States)
Baring, Matthew G. (Rice Univ. Houston, TX, United States)
van der Horst, Alexander J. (Universities Space Research Association Huntsville, AL, United States)
Guiriec, Sylvain (Alabama Univ. Huntsville, AL, United States)
Woods, Peter M. (Corvid Technologies, Inc. Mooresville, NC, United States)
Goegues, Ersin (Sabanci Univ. Istanbul, Turkey)
Kaneko, Yuki (Sabanci Univ. Istanbul, Turkey)
Scargle, Jeffrey (NASA Ames Research Center Moffett Field, CA, United States)
Granot, Jonathan (Hertfordshire Univ. Hatfield, United Kingdom)
Preece, Robert (Alabama Univ. Huntsville, AL, United States)
von Kienlin, Andreas (Max-Planck-Inst. fuer Extraterrestrische Physik Garching, Germany)
Chaplin, Vandiver (Alabama Univ. Huntsville, AL, United States)
Watts, Anna L. (Astronomical Inst. Amsterdam, Netherlands)
Wijers, Ralph A. M. J. (Astronomical Inst. Amsterdam, Netherlands)
Zhang, Shuang Nan (Institute of High Energy Physics Beijing, China)
Bhat, Narayan (Alabama Univ. Huntsville, AL, United States)
Finger, Mark H. (Universities Space Research Association Huntsville, AL, United States)
Gehrels. Neil (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Harding, Alice (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Kaper, Lex (Astronomical Inst. Amsterdam, Netherlands)
Kaspi, Victoria (McGill Univ. Montreal, Quebec, Canada)
Mcenery, Julie (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Meegan, Charles A. (Universities Space Research Association Huntsville, AL, United States)
Wilson-Hodge, Colleen (NASA Marshall Space Flight Center Huntsville, AL, United States)
Date Acquired
August 25, 2013
Publication Date
July 11, 2011
Subject Category
Astrophysics
Report/Patent Number
GSFC.ABS.5639.2011
Distribution Limits
Public
Copyright
Public Use Permitted.

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