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  • ASTRONOMY  (6)
  • Gamma-Ray Bursts  (3)
  • 1
    Electronic Resource
    Electronic Resource
    Observations of GRBs with the Explosive Transient Camera (1995)
    Springer
    Astrophysics and space science 231 (1995), S. 259-262 
    Details
    ISSN: 1572-946X
    Keywords: Gamma-Ray Bursts ; Optical Counterparts
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The Explosive Transient Camera (ETC) has been performing automatic observations of the night sky since 1990. Since the launch of the Compton Gamma-Ray Observatory, the times and localizations ofγ-ray bursts detected by the Burst and Transient Source Experiment (BATSE) have been compared with ETC observations to determine whether the ETC had observed a γ-ray burst in progress. To date, six temporal and spatial correlations have been found, but no new optical radiation has been detected. In this paper, we present current results of ETC/BATSE correlated observations and describe plans for future observations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00658628
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Immediate reports of GRBs in progress from HETE (1995)
    Springer
    Astrophysics and space science 231 (1995), S. 483-486 
    Details
    ISSN: 1572-946X
    Keywords: Gamma-Ray Bursts ; Satellites
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The High Energy Transient Experiment (HETE) will be able to perform multiwavelength observations ofγ-ray and X-ray bursts. HETE will potentially be able to localizeγ-ray bursts to a precision of ∼20 arc-minutes if significant X-ray flux is detected from the burst; a precision of ∼20 arc-seconds is possible if there is also significant UV radiation from the burst. HETE will broadcast information about bursts detected within seconds of their detection. This VHF-band broadcast will be received at a number of secondary ground stations (SGS) dedicated to HETE, and forwarded to a central distribution site at MIT, from which it is sent to interested observers via Internet.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00658676
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  • 3
    Electronic Resource
    Electronic Resource
    The UV cameras on the High Energy Transient Experiment (HETE) (1995)
    Springer
    Astrophysics and space science 231 (1995), S. 479-482 
    Details
    ISSN: 1572-946X
    Keywords: Gamma-Ray Bursts ; UV ; Satellites
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The High Energy Transient Experiment (HETE), scheduled for launch this year, is a small satellite dedicated to multiwavelength observations of γ-ray and X-ray bursts. The HETE spacecraft will be equipped with gamma-ray detectors, X-ray detectors with a coded mask, and ultraviolet-sensitive CCD cameras. The UV cameras on HETE are wide-field imagers which will a) provide UV images of the regions in which γ-ray or X-ray bursts are detected, before, duringand after the burst, b) detect UV transients, whether associated with a high-energy transient or not, c) monitor the brightnesses of field stars for variability over a wide range of timescales, and d) serve as star trackers for HETE. In this poster, we describe the HETE UV instrumentation, control software, and data products.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00658675
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  • 4
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    Discovery of the double Doppler-shifted emission-line systems in the X-ray spectrum of SS 433 (1994)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: We have used the CCD X-ray spectrometers on ASCA and resolved the X-ray emission line from the jet of SS 433 both into Doppler-shifted components with two distinct velocities, and into emission from different ionization states of iron, i.e., Fe XXV and Fe XXVI. This is the first direct detection of the two Doppler shifted beams in the X-ray spectra of SS 433 and allows the radial velocity of the jet along the line of sight to be determined with an accuracy comparable to the optical spectroscopy. We also found pairs of emission lines from other atomic species, such as ionized silicon and sulfur, with the Doppler shifts consistent with each other. This confirms the origin of the X-ray emission in the high temperature plasma in the jets.
    Keywords: ASTRONOMY
    Type: PASJ: Publications of the Astronomical Society of Japan (ISSN 0004-6264); 46; 4; p. L147-L150
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Deep optical and radio searches for a quiescent counterpart to the optical transient source OTS 1809+31 (1989)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Hudec (1987) has reported the detection of three bright transient optical images from the same celestial location localized to alpha(1950) = 18 h 9 m 26.29 s + or - 0.03 s, delta (1950) = +31 deg 23 arcmin 19.7 arcsec + or - 0.6 arcsec. This paper reports the result of a deep CCD search in four colors undertaken to find the quiescent counterpart of the optical transients. No source is found at the location of the transients to m(B) = 24.5; however, 18 objects in the vicinity of the reported coordinates which are consistent with the source having a proper motion of 1 arcsec/yr. A search at 6 cm with the VLA revealed no source in the mu less than 1 arcsec/yr circle to a 3 sigma limiting flux of 83 micro-Jy.
    Keywords: ASTRONOMY
    Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 338; 983-989
    Format: text
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  • 6
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    Current status of the Explosive Transient Camera (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-08-27
    Description: The current configuration and performance of the Explosive Transient Camera (ETC), a wide-field sky monitor capable of detecting short-timescale optical transients, are briefly reviewed, as are plans for future improvements. The primary objective of the ETC is to detect an optical transient that is spatially and temporally coincident with a gamma-ray burster. However, the ETC is sensitive to all sources of short-timescale optical transients and will conduct a systematic survey of the night sky for all optical transients. Results of preliminary observations of the night sky conducted since January 1991 are summarized, and long-term variability searches with the ETC are discussed.
    Keywords: ASTRONOMY
    Type: In: Gamma-ray bursts; Proceedings of the Workshop, Univ. of Alabama, Huntsville, Oct. 16-18, 1991 (A93-40051 16-93); p. 404-408.
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  • 7
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    The search for optical counterparts to BATSE GRBs with the Explosive Transient Camera (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: The Explosive Transient Camera (ETC), an automatic wide-field sky monitor sensitive to short-timescale optical transients, has been operating in conjunction with BATSE since the launch of GRO. In this paper, we discuss the probability and implications of the ETC monitoring a part of the sky in which BATSE detects a gamma-ray burst.
    Keywords: ASTRONOMY
    Type: In: Gamma-ray bursts; Proceedings of the Workshop, Univ. of Alabama, Huntsville, Oct. 16-18, 1991 (A93-40051 16-93); p. 347-349.
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  • 8
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    A search for high proper motion objects in two gamma-ray burst error regions (1986)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: Deep optical images of small gamma-ray burst error regions have generally resulted in the detection of several faint sources in each error region. It may be possible to identify the neutron star source of a GRB on the basis of a high transverse peculiar velocity if the source is at moderate distance. The results of searches for high proper motion objects in the error regions of GBS1412+78 and GBS2251-02 are reported.
    Keywords: ASTRONOMY
    Type: Advances in Space Research (ISSN 0273-1177); 6; 4 19
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  • 9
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    A search for optical flashes from the 'Perseus Flasher' (1986)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: The results of an extended search for short-timescale optical flashes from a four square-degree area centered on the coordinates of the Perseus Flasher are reported. The photographed optical flash was of brightness mB = -1.7 and had a duration of roughly 0.5 s. In 70 hours of observation no celestial optical flashes were detected in the region of the Perseus Flasher to a limiting magnitude of 7.1 for a one-second flash. Neither X-ray nor optical flashes were seen. A survey of archived photographic images of the Perseus Flasher revealed no optical transients in over 700 hours of total exposure time to a limiting magnitude of mB about 4-5 for a one-second flash. Based on the ETC data base, possible terrestrial sources of optical flashes which might account for the phenomenon are discussed.
    Keywords: ASTRONOMY
    Type: Advances in Space Research (ISSN 0273-1177); 6; 4 19
    Format: text
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