- Author
-
L. Lin
C. Kouveliotou
M.G. Baring
A.J. van der Horst
S. Guiriec
P.M. Woods
E. Göğüş
Y. Kaneko
J. Scargle
J. Granot
R. Preece
A. von Kienlin
V. Chaplin
A.L. Watts
R.A.M.J. Wijers
S.N. Zhang
N. Bhat
M.H. Finger
N. Gehrels
A. Harding
L. Kaper
V. Kaspi
J. Mcenery
C.A. Meegan
W.S. Paciesas
A. Pe'er
E. Ramirez-Ruiz
M. van der Klis
S. Wachter
C. Wilson-Hodge - Year
- 2011
- Title
- Fermi/Gamma-ray burst monitor observations of SGR J0501+4516 bursts
- Journal
- Astrophysical Journal
- Volume | Issue number
- 739 | 2
- Number of pages
- 16
- Document type
- Article
- Faculty
- Faculty of Science (FNWI)
- Institute
- Anton Pannekoek Institute for Astronomy (API)
- 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 ~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 × 1040 erg s-1).
- URL
- go to publisher's site
- Language
- English
- Persistent Identifier
- https://hdl.handle.net/11245/1.358864
Disclaimer/Complaints regulations
If you believe that digital publication of certain material infringes any of your rights or (privacy) interests, please let the Library know, stating your reasons. In case of a legitimate complaint, the Library will make the material inaccessible and/or remove it from the website. Please Ask the Library, or send a letter to: Library of the University of Amsterdam, Secretariat, Singel 425, 1012 WP Amsterdam, The Netherlands. You will be contacted as soon as possible.