scholarly journals Spectral analysis of GRB with the gamma–ray burst monitor on–board BeppoSAX

1999 ◽  
Vol 138 (3) ◽  
pp. 403-404 ◽  
Author(s):  
L. Amati ◽  
F. Frontera ◽  
E. Costa ◽  
M. Feroci ◽  
M. N. Cinti ◽  
...  
Keyword(s):  
Spectral Analysis ◽  
Gamma Ray ◽  
Gamma Ray Burst

scholarly journals Broadband spectral investigations of SGR J1550–5418 bursts

2012 ◽  
Vol 8 (S291) ◽  
pp. 444-446
Author(s):  
Lin Lin ◽  
Ersin Göğüş
Keyword(s):  
Magnetic Field ◽  
Spectral Analysis ◽  
Neutron Star ◽  
Hot Spots ◽  
Gamma Ray ◽  
Gamma Ray Burst ◽  
X Ray ◽  
Surface Magnetic Field ◽  
First Time ◽  
Burst Emission

AbstractWe present the results of our broadband (0.5 − 200 keV) spectral analysis of 42 SGR J1550–5418 bursts simultaneously detected with the Swift/X-ray Telescope (XRT) and the Fermi/Gamma-ray Burst Monitor (GBM), during the 2009 January active episode of the source. We find that, on average, the burst spectra are better described with two blackbody functions than with the Comptonized model. Thus, our joint XRT/GBM analysis clearly shows for the first time that the SGR J1550–5418 burst spectra might naturally be expected to exhibit a more truly thermalized character, such as a two-blackbody or even a multi-blackbody signal. We also studied the spin phase of the XRT burst emission, which indicate that the burst emitting sites on the neutron star need not to be co-located with hot spots emitting the bulk of the persistent X-ray emission and the surface magnetic field of SGR J1550–5418 is likely non-uniform over the emission zone.

The Fermi Gamma-Ray Burst Monitor: Results from the first year and spectral analysis of GRB 090323 and GRB 090328

2010 ◽  
Author(s):  
Elisabetta Bissaldi ◽  
Claudia Cecchi ◽  
Stefano Ciprini ◽  
Pasquale Lubrano ◽  
Gino Tosti ◽  
...  
Keyword(s):  
Spectral Analysis ◽  
Gamma Ray ◽  
First Year ◽  
Gamma Ray Burst

scholarly journals A physical background model for the Fermi Gamma-ray Burst Monitor

2020 ◽  
Vol 640 ◽  
pp. A8
Author(s):  
B. Biltzinger ◽  
F. Kunzweiler ◽  
J. Greiner ◽  
K. Toelge ◽  
J. Michael Burgess
Keyword(s):  
Spectral Analysis ◽  
Gamma Ray ◽  
Search Algorithm ◽  
Scientific Output ◽  
Gamma Ray Bursts ◽  
Background Model ◽  
Gamma Ray Burst ◽  
Physical Background ◽  
Transient Events

We present the first physically motivated background model for the Gamma-ray Burst Monitor (GBM) on board the Fermi satellite. Such a physically motivated background model has the potential to significantly improve the scientific output of Fermi/GBM, as it can be used to improve the background estimate for spectral analysis and localization of gamma-ray bursts (GRBs) and other sources. Additionally, this model can also lead to detections of new transient events, since long and weak, or slowly rising, events do not activate one of the existing trigger algorithms. In this paper we show the derivation of such a physically motivated background model, which includes the modeling of the different background sources and the correct handling of the response of GBM. While the goal of the paper is to introduce the model rather than developing a transient search algorithm, we demonstrate the ability of the model to fit the background seen by GBM by showing the following four applications for (1) a canonical GRB, (2) the ultra-long GRB 091024, (3) the V404 Cygni outburst in June 2015, and (4) the ultra-long GRB 130925A.

scholarly journals The First Pulse of the Extremely Bright GRB 130427A: A Test Lab for Synchrotron Shocks

Science ◽  
2013 ◽  
Vol 343 (6166) ◽  
pp. 51-54 ◽  
Author(s):  
R. Preece ◽  
J. Michael Burgess ◽  
A. von Kienlin ◽  
P. N. Bhat ◽  
M. S. Briggs ◽  
...  
Keyword(s):  
Spectral Analysis ◽  
Power Law ◽  
Time Resolution ◽  
Gamma Ray ◽  
Strongly Correlated ◽  
Initial Pulse ◽  
Gamma Ray Burst ◽  
Curvature Effects ◽  
Peak Energy ◽  
Fine Time

Gamma-ray burst (GRB) 130427A is one of the most energetic GRBs ever observed. The initial pulse up to 2.5 seconds is possibly the brightest well-isolated pulse observed to date. A fine time resolution spectral analysis shows power-law decays of the peak energy from the onset of the pulse, consistent with models of internal synchrotron shock pulses. However, a strongly correlated power-law behavior is observed between the luminosity and the spectral peak energy that is inconsistent with curvature effects arising in the relativistic outflow. It is difficult for any of the existing models to account for all of the observed spectral and temporal behaviors simultaneously.

scholarly journals Magnetohydrodynamic simulations of gamma-ray burst jets: Beyond the progenitor star

New Astronomy ◽  
2010 ◽  
Vol 15 (8) ◽  
pp. 749-754 ◽  
Author(s):  
Alexander Tchekhovskoy ◽  
Ramesh Narayan ◽  
Jonathan C. McKinney
Keyword(s):  
Gamma Ray ◽  
Gamma Ray Burst ◽  
Magnetohydrodynamic Simulations
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