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

Lin Lin; Chryssa Kouveliotou; Matthew G. Baring; Alexander J. van der Horst; Sylvain Guiriec; Peter M. Woods; Ersin Gogus; Yuki Kaneko; Jeffrey Scargle; Jonathan Granot; Robert Preece; Andreas von Kienlin; Vandiver Chaplin; Anna L. Watts; Ralph A. M. J. Wijers; Shuang Nan Zhang; Narayan Bhat; Mark H. Finger; Neil Gehrels; Alice Harding; Lex Kaper; Victoria Kaspi; Julie Mcenery; Charles A. Meegan; William S. Paciesas; Asaf Pe'er; Enrico Ramirez-Ruiz; Michiel van der Klis; Stefanie Wachter; Colleen Wilson-Hodge

doi:10.1088/0004-637X/739/2/87

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

Lin Lin, Chryssa Kouveliotou, Matthew G. Baring, Alexander J. van der Horst, Sylvain Guiriec, Peter M. Woods, Ersin Gogus, Yuki Kaneko, Jeffrey Scargle, Jonathan Granot, Robert Preece, Andreas von Kienlin, Vandiver Chaplin, Anna L. Watts, Ralph A. M. J. Wijers, Shuang Nan Zhang, Narayan Bhat, Mark H. Finger, Neil Gehrels, Alice HardingLex Kaper, Victoria Kaspi, Julie Mcenery, Charles A. Meegan, William S. Paciesas, Asaf Pe'er, Enrico Ramirez-Ruiz, Michiel van der Klis, Stefanie Wachter, Colleen Wilson-Hodge

Centre for Astrophysics Research (CAR)

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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)).

Original language	English
Article number	87
Pages (from-to)	-
Number of pages	16
Journal	The Astrophysical Journal
Volume	739
Issue number	2
DOIs	https://doi.org/10.1088/0004-637X/739/2/87
Publication status	Published - 1 Oct 2011

Keywords

soft gamma repeater: general
soft gamma repeater: individual(SGRJ0501+4516)

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10.1088/0004-637X/739/2/87

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‘In these times, during the rise in the popularity of institutional repositories, the Society does not forbid authors from depositing their work in such repositories. However, the AAS regards the deposit of scholarly work in such repositories to be a decision of the individual scholar, as long as the individual's actions respect the diligence of the journals and their reviewers.’ Original article can be found at : http://iopscience.iop.org/ Copyright American Astronomical Society
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Lin, L., Kouveliotou, C., Baring, M. G., van der Horst, A. J., Guiriec, S., Woods, P. M., Gogus, E., Kaneko, Y., Scargle, J., Granot, J., Preece, R., von Kienlin, A., Chaplin, V., Watts, A. L., Wijers, R. A. M. J., Zhang, S. N., Bhat, N., Finger, M. H., Gehrels, N., ... Wilson-Hodge, C. (2011). Fermi/gamma-ray burst monitor observations of SGR J0501+4516 bursts. The Astrophysical Journal, 739(2), -. Article 87. https://doi.org/10.1088/0004-637X/739/2/87

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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-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)).",

keywords = "soft gamma repeater: general, soft gamma repeater: individual(SGRJ0501+4516)",

author = "Lin Lin and Chryssa Kouveliotou and Baring, {Matthew G.} and {van der Horst}, {Alexander J.} and Sylvain Guiriec and Woods, {Peter M.} and Ersin Gogus and Yuki Kaneko and Jeffrey Scargle and Jonathan Granot and Robert Preece and {von Kienlin}, Andreas and Vandiver Chaplin and Watts, {Anna L.} and Wijers, {Ralph A. M. J.} and Zhang, {Shuang Nan} and Narayan Bhat and Finger, {Mark H.} and Neil Gehrels and Alice Harding and Lex Kaper and Victoria Kaspi and Julie Mcenery and Meegan, {Charles A.} and Paciesas, {William S.} and Asaf Pe'er and Enrico Ramirez-Ruiz and {van der Klis}, Michiel and Stefanie Wachter and Colleen Wilson-Hodge",

note = "{\textquoteleft}In these times, during the rise in the popularity of institutional repositories, the Society does not forbid authors from depositing their work in such repositories. However, the AAS regards the deposit of scholarly work in such repositories to be a decision of the individual scholar, as long as the individual's actions respect the diligence of the journals and their reviewers.{\textquoteright} Original article can be found at : http://iopscience.iop.org/ Copyright American Astronomical Society",

year = "2011",

month = oct,

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doi = "10.1088/0004-637X/739/2/87",

language = "English",

volume = "739",

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journal = "The Astrophysical Journal",

issn = "0004-637X",

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Lin, L, Kouveliotou, C, Baring, MG, van der Horst, AJ, Guiriec, S, Woods, PM, Gogus, E, Kaneko, Y, Scargle, J, Granot, J, Preece, R, von Kienlin, A, Chaplin, V, Watts, AL, Wijers, RAMJ, Zhang, SN, Bhat, N, Finger, MH, Gehrels, N, Harding, A, Kaper, L, Kaspi, V, Mcenery, J, Meegan, CA, Paciesas, WS, Pe'er, A, Ramirez-Ruiz, E, van der Klis, M, Wachter, S & Wilson-Hodge, C 2011, 'Fermi/gamma-ray burst monitor observations of SGR J0501+4516 bursts', The Astrophysical Journal, vol. 739, no. 2, 87, pp. -. https://doi.org/10.1088/0004-637X/739/2/87

TY - JOUR

T1 - Fermi/gamma-ray burst monitor observations of SGR J0501+4516 bursts

AU - Lin, Lin

AU - Kouveliotou, Chryssa

AU - Baring, Matthew G.

AU - van der Horst, Alexander J.

AU - Guiriec, Sylvain

AU - Woods, Peter M.

AU - Gogus, Ersin

AU - Kaneko, Yuki

AU - Scargle, Jeffrey

AU - Granot, Jonathan

AU - Preece, Robert

AU - von Kienlin, Andreas

AU - Chaplin, Vandiver

AU - Watts, Anna L.

AU - Wijers, Ralph A. M. J.

AU - Zhang, Shuang Nan

AU - Bhat, Narayan

AU - Finger, Mark H.

AU - Gehrels, Neil

AU - Harding, Alice

AU - Kaper, Lex

AU - Kaspi, Victoria

AU - Mcenery, Julie

AU - Meegan, Charles A.

AU - Paciesas, William S.

AU - Pe'er, Asaf

AU - Ramirez-Ruiz, Enrico

AU - van der Klis, Michiel

AU - Wachter, Stefanie

AU - Wilson-Hodge, Colleen

N1 - ‘In these times, during the rise in the popularity of institutional repositories, the Society does not forbid authors from depositing their work in such repositories. However, the AAS regards the deposit of scholarly work in such repositories to be a decision of the individual scholar, as long as the individual's actions respect the diligence of the journals and their reviewers.’ Original article can be found at : http://iopscience.iop.org/ Copyright American Astronomical Society

PY - 2011/10/1

Y1 - 2011/10/1

N2 - 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)).

AB - 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)).

KW - soft gamma repeater: general

KW - soft gamma repeater: individual(SGRJ0501+4516)

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U2 - 10.1088/0004-637X/739/2/87

DO - 10.1088/0004-637X/739/2/87

M3 - Article

SN - 0004-637X

VL - 739

SP - -

JO - The Astrophysical Journal

JF - The Astrophysical Journal

IS - 2

M1 - 87

ER -

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

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