B. Stern

Publications (3)13.46 Total impact

• Source

  Available from: ArXiv

  Article: The Interplanetary Network Supplement to the BATSE Catalogs of Untriggered Cosmic Gamma-Ray Bursts

  K. Hurley, B. Stern, J. Kommers, T. Cline, E. Mazets, S. Golenetskii, J. Trombka, T. McClanahan, J. Goldsten, M. Feroci, F. Frontera, C. Guidorzi, E. Montanari, W. Lewin, C. Meegan, G. Fishman, C. Kouveliotou, S. Sinha, and S. Seetha
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  ABSTRACT: We present Interplanetary Network (IPN) detection and localization information for 211 gamma-ray bursts (GRBs) observed as untriggered events by the Burst and Transient Source Experiment (BATSE) and published in catalogs by Kommers et al. and Stern et al. IPN confirmations have been obtained by analyzing the data from 11 experiments. For any given burst observed by BATSE and one other distant spacecraft, arrival time analysis (or "triangulation") results in an annulus of possible arrival directions whose half-width varies between 14'' and 56, depending on the intensity, time history, and arrival direction of the burst, as well as the distance between the spacecraft. This annulus generally intersects the BATSE error circle, resulting in a reduction of the area of up to a factor of ~650. When three widely separated spacecraft observed a burst, the result is an error box whose area is as much as 30,000 times smaller than that of the BATSE error circle. Because the IPN instruments are considerably less sensitive than BATSE, they generally did not detect the weakest untriggered bursts but did detect the more intense ones, which failed to trigger BATSE when the trigger was disabled. In a few cases, we have been able to identify the probable origin of bursts as soft gamma repeaters. The vast majority of the IPN-detected events, however, are GRBs, and the confirmation of them validates many of the procedures utilized to detect BATSE untriggered bursts.
  The Astrophysical Journal Supplement Series 12/2008; 156(2):217. · 13.46 Impact Factor
• Article: IPN supplement to BATSE untriggered GRBs (Hurley+, 2005)

  K. Hurley, B. Stern, J. Kommers, T. Cline, E. Mazets, S. Golenetskii, J. Trombka, T. McClanahan, J. Goldsten, M. Feroci, F. Frontera, C. Guidorzi, E. Montanari, W. Lewin, C. Meegan, G. Fishman, C. Kouveliotou, S. Sinha, S. Seetha
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  ABSTRACT: We present Interplanetary Network (IPN) detection and localization information for 211 gamma-ray bursts (GRBs) observed as untriggered events by the Burst and Transient Source Experiment (BATSE) and published in catalogs by Kommers et al. (Cat. ) and Stern et al. (Cat. ). IPN confirmations have been obtained by analyzing the data from 11 experiments. For any given burst observed by BATSE and one other distant spacecraft, arrival time analysis (or "triangulation") results in an annulus of possible arrival directions whose half-width varies between 14' and 5.6{deg}, depending on the intensity, time history, and arrival direction of the burst, as well as the distance between the spacecraft. This annulus generally intersects the BATSE error circle, resulting in a reduction of the area of up to a factor of ~650. When three widely separated spacecraft observed a burst, the result is an error box whose area is as much as 30,000 times smaller than that of the BATSE error circle. Because the IPN instruments are considerably less sensitive than BATSE, they generally did not detect the weakest untriggered bursts but did detect the more intense ones, which failed to trigger BATSE when the trigger was disabled. In a few cases, we have been able to identify the probable origin of bursts as soft gamma repeaters. The vast majority of the IPN-detected events, however, are GRBs, and the confirmation of them validates many of the procedures utilized to detect BATSE untriggered bursts. (4 data files).
  VizieR Online Data Catalog. 07/2005; 215:60217.
• Source

  Available from: arxiv.org

  Article: Observations of giant outbursts from Cygnus X-1

  S. Golenetskii, R. Aptekar, D. Frederiks, E. Mazets, V. Palshin, K. Hurley, T. Cline, B. Stern
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  ABSTRACT: We present interplanetary network localization, spectral, and time history information for 7 episodes of exceptionally intense gamma-ray emission from Cygnus X-1. The outbursts occurred between 1995 and 2003, with durations up to \~28000 seconds. The observed 15 - 300 keV peak fluxes and fluences reached 3E-7 erg /cm2 s, and 8E-4 erg / cm2 respectively. By combining the triangulations of these outbursts we derive an ~1700 square arcminute (3 sigma) error ellipse which contains Cygnus X-1 and no other known high energy sources. The outbursts reported here occurred both when Cyg X-1 was in the hard state as well as in the soft one, and at various orbital phases. The spectral data indicate that these outbursts display the same parameters as those of the underlying hard and soft states, suggesting that they represent another manifestation of these states. Comment: 27 pages, 9 figures. Revised version. Accepted for publication in the Astrophysical Journal, tentatively scheduled for October 20, 2003 Part 1
  12/2002;