scholarly journals Soft Gamma Repeaters Revisited with BATSE

1996 ◽  
Vol 165 ◽  
pp. 477-488
Author(s):  
C. Kouveliotou
Keyword(s):  
Radio Source ◽  
Gamma Ray ◽  
Short Review ◽  
X Ray ◽  
Soft Gamma Repeaters ◽  
Compact Radio Source ◽  
Transient Source ◽  
Soft Gamma Repeater ◽  
Burst And Transient Source

After the first 4 years of its operation, the Burst and Transient Source Experiment (BATSE) onboard the Compton Gamma Ray Observatory (CGRO), detected recurrent emission from two of the three known Soft Gamma Repeater (SGR) sources, SGR 1900+14 and SGR 1806-20. The reactivation of the latter prompted a quick international campaign resulting in the identification of the X-ray counterpart of the source, which also coincides with a compact radio source. The absence of detection of new sources in the 4 years of BATSE operation and the reactivation of two of the three already known SGRs, indicates that these objects are rare. We give here a short review of the previously detected SGR emissions and present the recent results obtained with BATSE.

scholarly journals Aperiodic Flux Variability in A 0535+262

1996 ◽  
Vol 165 ◽  
pp. 313-319
Author(s):  
Mark H. Finger ◽  
Robert B. Wilson ◽  
B. Alan Harmon ◽  
William S. Paciesas
Keyword(s):  
Neutron Star ◽  
Gamma Ray ◽  
Beat Frequency ◽  
Power Spectra ◽  
Center Frequency ◽  
X Ray ◽  
Binary Pulsar ◽  
Transient Source ◽  
Flux Variability ◽  
Burst And Transient Source

A “giant” outburst of A 0535+262, a transient X-ray binary pulsar, was observed in 1994 February and March with the Burst and Transient Source Experiment (BATSE) onboard the Compton Gamma-Ray Observatory. During the outburst power spectra of the hard X-ray flux contained a QPO-like component with a FWHM of approximately 50% of its center frequency. Over the course of the outburst the center frequency rose smoothly from 35 mHz to 70 mHz and then fell to below 40 mHz. We compare this QPO frequency with the neutron star spin-up rate, and discuss the observed correlation in terms of the beat frequency and Keplerian frequency QPO models in conjunction with the Ghosh-Lamb accretion torque model.

The burst and transient source experiment for the gamma-ray observatory

1982 ◽  
Author(s):  
G. J. Fishman ◽  
C. A. Meegan ◽  
T. A. Parnell ◽  
R. B. Wilson
Keyword(s):  
Gamma Ray ◽  
Transient Source ◽  
Burst And Transient Source

scholarly journals A compact radio source in the high-redshift soft gamma-ray blazar IGR J12319–0749

2013 ◽  
Vol 552 ◽  
pp. A109 ◽  
Author(s):  
S. Frey ◽  
Z. Paragi ◽  
K. É. Gabányi ◽  
T. An
Keyword(s):  
Radio Source ◽  
Gamma Ray ◽  
High Redshift ◽  
Compact Radio Source

Gamma-ray burst locations from the Burst and Transient Source Experiment

1991 ◽  
Author(s):  
M. N. Brock ◽  
C. A. Meegan ◽  
F. E. Roberts ◽  
G. J. Fishman ◽  
R. B. Wilson ◽  
...  
Keyword(s):  
Gamma Ray ◽  
Gamma Ray Burst ◽  
Transient Source ◽  
Burst And Transient Source

scholarly journals A mass model for estimating the gamma ray background of the Burst and Transient Source Experiment

2003 ◽  
Vol 398 (1) ◽  
pp. 391-402 ◽  
Author(s):  
S. E. Shaw ◽  
M. J. Westmore ◽  
A. J. Bird ◽  
A. J. Dean ◽  
C. Ferguson ◽  
...  
Keyword(s):  
Gamma Ray ◽  
Mass Model ◽  
Transient Source ◽  
Burst And Transient Source

scholarly journals Rapid Hard X-Ray Variability in GRO J0422+32

1998 ◽  
Vol 188 ◽  
pp. 398-399
Author(s):  
F. van der Hooft ◽  
J. van Paradijs ◽  
M. Van Der Klis ◽  
C. Kouveliotou ◽  
D.J. Crary ◽  
...  
Keyword(s):  
Decay Time ◽  
Energy Band ◽  
X Ray ◽  
Secondary Maximum ◽  
Transient Source ◽  
History Of ◽  
Burst And Transient Source

The soft X-ray transient (SXT) GRO J0422+32 (Nova Persei 1992) was detected with the Burst And Transient Source Experiment (BATSE) on board the CGRO on 1992 August 5 (Paciesas et al. 1992) (Truncated Julian Day [TJD] 8839). The source intensity of GRO J0422+32 increased rapidly, reaching a flux of ~ 3 Crab (40-230 keV) within days after its first detection (Harmon et al. 1992). Hereafter, the X-ray intensity of the source decreased exponentially with a decay time of ~ 43 days (Vikhlinin et al. 1995). A secondary maximum of the X-ray intensity was reached at TJD 8978, 139 days after the first detection of the source. The daily averaged flux history of GRO J0422+32 in the 40-150 keV energy band is presented in Figure 1.

Performance Of The Large-Area Detectors For The Burst And Transient Source Experiment (BATSE) On The Gamma Ray Observatory

1989 ◽  
Author(s):  
W. S. Paciesas ◽  
G. N. Pendleton ◽  
J. P. Lestrade ◽  
G. J. Fishman ◽  
C. A. Meegan ◽  
...  
Keyword(s):  
Gamma Ray ◽  
Large Area ◽  
Transient Source ◽  
Burst And Transient Source

scholarly journals The study of variability of 8 blazar candidates among the Fermi-LAT unidentified gamma-ray sources

2019 ◽  
Vol 15 (S356) ◽  
pp. 132-136
Author(s):  
Pheneas Nkundabakura ◽  
Jean D’amour Kamanzi ◽  
Jean D. Mbarubucyeye ◽  
Tom Mutabazi
Keyword(s):  
Time Series ◽  
Radio Source ◽  
Spectral Index ◽  
Gamma Ray ◽  
Galactic Plane ◽  
Object Location ◽  
X Ray ◽  
Flux Variability ◽  
Bl Lac ◽  
Variability Index

AbstractWe discuss the time-series behavior of 8 extragalactic 3FGL sources away from the Galactic plane (i.e., |b|⩾10°) whose uncertainty ellipse contains a single X-ray and one radio source. The analysis was done using the standard Fermi ScienceTools, package of version v10r0p5. The results show that sources in the study sample display a slight indication of flux variability in γ-ray on monthly timescale. Furthermore, based on the object location on the variability index versus spectral index diagram, the positions of 4 objects in the sample were found to fall in the region of the already known BL Lac positions.

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