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        Fermi/gamma-ray burst monitor observations of SGR J0501+4516 bursts

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        Author
        Lin, Lin
        Kouveliotou, Chryssa
        Baring, Matthew G.
        van der Horst, Alexander J.
        Guiriec, Sylvain
        Woods, Peter M.
        Gogus, Ersin
        Kaneko, Yuki
        Scargle, Jeffrey
        Granot, Jonathan
        Preece, Robert
        von Kienlin, Andreas
        Chaplin, Vandiver
        Watts, Anna L.
        Wijers, Ralph A. M. J.
        Zhang, Shuang Nan
        Bhat, Narayan
        Finger, Mark H.
        Gehrels, Neil
        Harding, Alice
        Kaper, Lex
        Kaspi, Victoria
        Mcenery, Julie
        Meegan, Charles A.
        Paciesas, William S.
        Pe'er, Asaf
        Ramirez-Ruiz, Enrico
        van der Klis, Michiel
        Wachter, Stefanie
        Wilson-Hodge, Colleen
        Attention
        2299/6612
        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-90 durations of the bursts can be fit with a log-normal distribution with a mean value of similar to 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-90 values estimated in count space (following a log-normal distribution with a mean value of similar to 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-peak decreases with energy flux (and fluence) to a minimum of similar to 30 keV at F = 8.7 x 10(-6) erg cm(-2) s(-1), increasing steadily afterward. Two more sources exhibit a similar trend: SGRs J1550-5418 and 1806-20. The isotropic luminosity, L-iso, corresponding to these flux values is roughly similar for all sources (0.4-1.5 x 10(40) erg s(-1)).
        Publication date
        2011-10-01
        Published in
        The Astrophysical Journal
        Published version
        https://doi.org/10.1088/0004-637X/739/2/87
        Other links
        http://hdl.handle.net/2299/6612
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