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Fermi/Gamma-Ray Burst Monitor Observations of SGR J0501+4516 Bursts

Lin, Lin and Wachter, Stefanie (2011) Fermi/Gamma-Ray Burst Monitor Observations of SGR J0501+4516 Bursts. Astrophysical Journal, 739 (2). Art. No. 87. ISSN 0004-637X.

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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 ~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 ~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 ~30 keV at F = 8.7 × 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 × 10^(40) erg s^(–1)).

Item Type:Article
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Lin, Lin0000-0001-6860-9566
Additional Information:© 2011 American Astronomical Society. Received 2011 March 21; accepted 2011 July 8; published 2011 September 13. This publication is part of the GBM/Magnetar Key Project (NASA grant NNH07ZDA001-GLAST, PI: C. Kouveliotou). M.G.B. acknowledges support from NASA through grant NNX10AC59A. E.G. and Y.K. acknowledge the support from the Scientific and Technological Research Council of Turkey (TÜBİTAK) through grant 109T755. A.v.K. was supported by the Bundesministeriums für Wirtschaft und Technologie (BMWi) through DLR grant 50 OG 1101. A.L.W. acknowledges support from a Netherlands Organization for Scientific Research (NWO) Vidi Grant. R.A.M.J.W. acknowledges support from the European Research Council via Advanced Investigator Grant No. 247295.
Funding AgencyGrant Number
Türkiye Bilimsel ve Teknolojik Araştırma Kurumu (TÜBİTAK)109T755
Bundesministeriums für Wirtschaft and Technololgie (BMWi)50 OG 1101
Netherlands Organization for Scientific Research (NWO)UNSPECIFIED
European Research Council (ERC)247295
Subject Keywords:pulsars: individual (SGR J0501+4516); X-rays: bursts
Issue or Number:2
Classification Code:PACS: 98.70.Rz
Record Number:CaltechAUTHORS:20111007-100513883
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Official Citation:Fermi/Gamma-Ray Burst Monitor Observations of SGR J0501+4516 Bursts Lin Lin et al. 2011 ApJ 739 87
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:27120
Deposited By: Jason Perez
Deposited On:07 Oct 2011 21:32
Last Modified:29 Oct 2020 21:34

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