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  • Articles  (2)
  • Other Sources  (34)
  • Space Radiation  (18)
  • Astrophysics  (14)
  • SPACECRAFT INSTRUMENTATION  (2)
  • BACODINE  (1)
  • Counterparts  (1)
Collection
  • Articles  (2)
  • Other Sources  (34)
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Keywords
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  • 1
    Electronic Resource
    Electronic Resource
    BATSE/OSSE rapid burst response (1995)
    Springer
    Astrophysics and space science 231 (1995), S. 127-130 
    Details
    ISSN: 1572-946X
    Keywords: Gamma-ray bursts ; Counterparts ; Instrumentation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The BATSE and OSSE instrument teams have modified flight software to promptly (within 2 min of trigger) slew the OSSE detectors to burst locations determined on-board by BATSE. This enables OSSE to make sensitive searches for prompt and delayed post-burst line and continuum emission above 50 keV. In the best cases our sensitivity will be more than an order of magnitude better than any other search in this energy range. We expect to slew to 1–2 bursts per month, based on the OSSE FOV and BATSE event rate. Detections or limits from continued operation of this system may provide significant constraints on burst models. As an example of the observations made using this system, we present preliminary limits for post-burst emission from GRB 950223 on several time scales.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00658601
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    A search for prompt radio emission from GRBs (1995)
    Springer
    Astrophysics and space science 231 (1995), S. 281-284 
    Details
    ISSN: 1572-946X
    Keywords: GRB radio counterparts ; BACODINE
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The Cambridge Low Frequency Synthesis Telescope (CLFST) is being used to search for prompt radio emission from GRBs at 151 MHz. For this search a special observing mode has recently been developed; the antennas of the CLFST are split into seven groups which are spaced about 30° apart. When triggered by the real-time signals from the BACODINE system the antennas are slewed to the GRB position, with data being sampled at 1.5 or 3-s intervals. The antennas slew at about 10° per minute, so that an appreciable fraction of the sky can be accessed on timescales of a few minutes - any prompt radio emission from a GRB might be delayed by this timescale due to propagation effects.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00658632
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    Paper (German National Licenses)
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  • 3
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    Preliminary burst location calibration results for the BATSE instrument on CGRO (1992)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: Preliminary results pertaining to burst location using BATSE Large Area Detector measurements of solar flares are presented. These solar flare measurements are currently being used to fine tune the calibration of our data analysis software. The current status of techniques for identifying and eliminating systematic errors from the data analysis tools is discussed. Data revealing the effects of the atmospheric scattering algorithm that will be implemented in the data analysis software are presented.
    Keywords: SPACECRAFT INSTRUMENTATION
    Type: In: Gamma-ray bursts; Proceedings of the Workshop, Univ. of Alabama, Huntsville, Oct. 16-18, 1991 (A93-40051 16-93); p. 395-398.
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    ROSAT X-Ray Observation of the Second Error Box for SGR 1900+14 (1997)
    In:  Other Sources
    Details
    Publication Date: 2011-08-23
    Description: The positions of the two error boxes for the soft gamma repeater (SGR) 1900+14 were determined by the "network synthesis" method, which employs observations by the Ulysses gamma-ray burst and CGRO BATSE instruments. The location of the first error box has been observed at optical, infrared, and X-ray wavelengths, resulting in the discovery of a ROSAT X-ray point source and a curious double infrared source. We have recently used the ROSAT HRI to observe the second error box to complete the counterpart search. A total of six X-ray sources were identified within the field of view. None of them falls within the network synthesis error box, and a 3 sigma upper limit to any X-ray counterpart was estimated to be 6.35 x 10(exp -14) ergs/sq cm/s. The closest source is approximately 3 min. away, and has an estimated unabsorbed flux of 1.5 x 10(exp -12) ergs/sq cm/s. Unlike the first error box, there is no supernova remnant near the second error box. The closest one, G43.9+1.6, lies approximately 2.dg6 away. For these reasons, we believe that the first error box is more likely to be the correct one.
    Keywords: Space Radiation
    Type: Astrophysical Journal; Volume 490; 823
    Format: text
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  • 5
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    The Optical Counterpart to Gamma-Ray Burst GRB 970228 Observed Using the Hubble Space Telescope (1997)
    In:  Other Sources
    Details
    Publication Date: 2011-08-23
    Description: Although more than 2,000 astronomical gamma-ray bursts (GRBS) have been detected, and numerous models proposed to explain their occurrence, they have remained enigmatic owing to the lack of an obvious counterpart at other wavelengths. The recent ground-based detection of a transient optical source in the vicinity of GRB970228 may therefore have provided a breakthrough. The optical counterpart appears to be embedded in an extended source which, if a galaxy, as has been suggested would lend weight to those models that place GRBs at cosmological distances. Here we report, observations using the Hubble Space Telescope of the transient counterpart and extended source 26 and 39 days after the initial gamma-ray outburst. We find that the counterpart has faded since the initial detection (and continues to fade), but the extended source exhibits no significant change in brightness between the two dates of the observations reported here. The size and apparent constancy of the extended source imply that it is extragalactic, but its faintness makes a definitive statement about its nature difficult. Nevertheless, the decay profile of the transient source is consistent with a popular impulsive-fireball model13, which assumes a merger between two neutron stars in a distant galaxy.
    Keywords: Space Radiation
    Format: text
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  • 6
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    A Search for TeV Counterparts to BATSE Gamma-Ray Bursts (1997)
    In:  Other Sources
    Details
    Publication Date: 2011-08-23
    Description: Intense effort has gone into the observation of optical, radio, and X-ray gamma-ray burst (GRB) counterparts, either simultaneous to the burst or as quasi-steady lingering remnants. Here we report on a similar study at higher energies of 250 GeV and above using ground-based telescopes. The recent technical advances represented by the atmospheric Cherenkov imaging technique (Cawley & Weekes 1995) have opened up the field of gamma-ray astronomy above 250 GeV and raised the possibility that these techniques can be used with excellent fluence sensitivity in exploring the GRB phenomenon. Observations by the Whipple collaboration of nine BATSE positions, one acquired within 2 minutes of the reported BATSE burst time, using coordinates distributed through the BATSE Coordinates Distribution Network (BACODINE) are reported. No evidence of TeV emission is found, and upper limits to the high-energy delayed or extended emission of observed candidates are calculated.
    Keywords: Space Radiation
    Type: Astrophysical Journal; Volume 479; 859
    Format: text
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  • 7
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    The Identification of Two Different Spectral Types of Pulses in Gamma-Ray Bursts (1997)
    In:  Other Sources
    Details
    Publication Date: 2011-08-23
    Description: It is shown in this study that two different types of spectral emission are generally produced in gamma-ray bursts. A subset of bursts is identified that exhibits a marked lack of fluence above 300 keV, and these bursts are shown to have luminosities about an order of magnitude lower than bursts with significant fluence above 300 keV. The bursts lacking emission above 300 keV exhibit an effectively homogeneous intensity distribution. In addition, it is shown that both types of emission are common in many bursts, demonstrating that a single source object is capable of generating both of them. These results strongly favor a gamma-ray burst source object that produces two different types of emission with varying degrees of superposition. The impact of this behavior is strong enough that it affects the properties of the burst intensity distribution, as well as the burst spectral characteristics.
    Keywords: Space Radiation
    Type: Astrophysical Journal; Volume 489; 175-198
    Format: text
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  • 8
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    Consistency of time dilation in temporal profiles and spectra of gamma-ray bursts (1995)
    In:  Other Sources
    Details
    Publication Date: 2019-01-25
    Description: If gamma-ray bursters are at cosmological distances-a possibility suggested by their isotropic distribution and spatial inhomogeneity-then the temporal profiles and spectra of more distant sources will be time dilated compared to those of relatively nearby sources. Analyses of bright and dim Burst and Transient Source Experiment (BATSE) gamma-ray bursts yield a relative time-dilation factor of 2.3 on timescales of pulses and event durations. We redshift the spectra of time intervals near the intensity peaks of the bright sample on a trial grid and compare with spectra of the dim sample. A redshift factor of order two-with wide latitude permitted-brings the spectra of the two brightness groups into alignment. Thus there is coarse agreement with the time-dilation factor found in the temporal domain.
    Keywords: Astrophysics
    Type: Gamma ray astronomy; E2 Symposium of COSPAR Scientific Commission E, COSPAR Scientific Assembly, 30th, Hamburg, Germany, July 11-21, 1994 . (ISSN 0273-1177); 15; 5; p. (5)135-(5)138
    Format: text
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  • 9
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    GLAST Burst Monitor Trigger Classification Algorithm (2004)
    In:  Other Sources
    Details
    Publication Date: 2019-07-18
    Description: The Gamma Ray Large Area Space Telescope (GLAST), currently set for launch in the first quarter of 2007, will consist of two instruments, the GLAST Burst Monitor (GBM) and the Large Area Telescope (LAT). One of the goals of the GBM is to identify and locate gamma-ray bursts using on-board software. The GLAST observatory can then be re-oriented to allow observations by the LAT. A Bayesian analysis will be used to distinguish gamma-ray bursts from other triggering events, such as solar flares, magnetospheric particle precipitation, soft gamma repeaters (SGRs), and Cygnus X-1 flaring. The trigger parameters used in the analysis are the burst celestial coordinates, angle from the Earth's horizon, spectral hardness, and the spacecraft geomagnetic latitude. The algorithm will be described and the results of testing will be presented.
    Keywords: Astrophysics
    Type: Meeting of the High Energy Astrophysics Division of the American Astronomical Society; Sep 08, 2004 - Sep 11, 2004; New Orleans, LA; United States
    Format: text
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  • 10
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    The Decay of Optical Emission from the gamma-Ray Burst GRB970228 (1997)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The origin of gamma-ray bursts has been one of the great unsolved mysteries in high-energy astrophysics for almost 30 years. The recent discovery of fading sources at X-ray and optical wavelengths coincident with the location of the gamma-ray burst GRB970228 therefore provides an unprecedented opportunity to probe the nature of these high-energy events. The optical counterpart appears to be a transient point source embedded in a region of extended nebulosity, the latter having been tentatively identified as a high-redshift galaxy. This would seem to favour models that place gamma-ray bursts at cosmological distances, although a range of mechanisms for producing the bursts is still allowed. A crucial piece of information for distinguishing between such models is how the brightness of the optical counterpart evolves with time. Here we re-evaluate the existing photometry of the optical counterpart of GRB970228 to construct an optical light curve for the transient event. We find that between 21 hours and six days after the burst, the R-band brightness decreased by a factor of approximately 40, with any subsequent decrease in brightness occurring at a much slower rate. As the point source faded, it also became redder. The initial behaviour of the source appears to be consistent with the 'fireball' model, but the subsequent decrease in the rate of fading may prove harder to explain.
    Keywords: Space Radiation
    Type: NASA-TM-112889 , NAS 1.15:112889 , Letters to Nature; 387; 479-481
    Format: application/pdf
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