Yazar "Barthelmy, S." seçeneğine göre listele

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    Öğe
    ROITSE-III performance in the swift era
    (Amer Inst Physics, 2006) Yost, S. A.; Rykoff, E. S.; Aharonian, F.; Akerlof, C. W.; Ashley, M. C. B.; Barthelmy, S.; Gehrels, N.
    We report the successful performance of the Robotic Optical Transient Search Experiment (ROTSE) to promptly-disseminated Swift GRB triggers. ROTSE-III is a worldwide network of 4 unfiltered 0.45m optical telescopes. The telescopes operate robotically, automatically responding to GRB position triggers with a preset observations sequence. Including weather and other downtime, ROTSE-III can immediately respond to similar to 40% of Swift trigger positions, with shutter open within approximately 6-8 seconds from the trigger dissemination. We discuss improvements made possible in the automated response the the small, accurate Swift error boxes. We report ROTSE-III's general results, including OTs discovered or confirmed, the distribution of imaging start times relative to the GRB duration, and an overview of OT lightcurves.
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    Öğe
    ROTSE-III performance in the Swift era
    (2006) Yost, S.A.; Rykoff, E.S.; Aharonian, F.; Akerlof, C.W.; Ashley, M.C.B.; Barthelmy, S.; Gehrels, N.
    We report the successful performance of the Robotic Optical Transient Search Experiment (ROTSE) to promptly-disseminated Swift GRB triggers. ROTSE-III is a worldwide network of 4 unfiltered 0.45m optical telescopes. The telescopes operate robotically, automatically responding to GRB position triggers with a preset observations sequence. Including weather and other downtime, ROTSE-III can immediately respond to ?40% of Swift trigger positions, with shutter open within approximately 6-8 seconds from the trigger dissemination. We discuss improvements made possible in the automated response the the small, accurate Swift error boxes. We report ROTSE-III's general results, including OTs discovered or confirmed, the distribution of imaging start times relative to the GRB duration, and an overview of OT lightcurves. © 2006 American Institute of Physics.
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    Öğe
    Status of the ROTSE-III telescope network
    (Wiley-V C H Verlag Gmbh, 2006) Yost, S. A.; Aharonian, F.; Akerlof, C. W.; Ashley, M. C. B.; Barthelmy, S.; Gehrels, N.; Gogus, E.
    ROTSE-III is a homogeneous worldwide array of 4 robotic telescopes. They were designed to provide optical observations of gamma-ray burst (GRB) afterglows as close as possible to the start of gamma-ray emission. ROTSE-III is fulfilling its potential for GRB science, and provides optical observations for a variety of astrophysical sources in the interim between GRB events. (c) 2006 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
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    Taking a broad view of prompt emission
    (Soc Italiana Fisica, 2006) Yost, S. A.; Aharonian, F.; Akerlof, C. W.; Ashley, M. C. B.; Barthelmy, S.; Gehrels, N.; Gogus, E.
    We discuss the diversity of prompt Gamma-Ray Burst (GRB) spectra from high to low energies, comparing optical observations to simultaneous garnma-ray emission. These events show a wide variety of relations between gamma-ray and optical spectral and temporal properties. Using optical detections and limits from ROTSE as well as the literature, we constrain the broad-band spectral shape during GRB events. With no single result for low-energy emission behavior, GRB models will need to account for diverse outcomes.
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    The dark side of ROTSE-III prompt GRB observations
    (Iop Publishing Ltd, 2007) Yost, S. A.; Aharonian, F.; Akerlof, C. W.; Ashley, M. C. B.; Barthelmy, S.; Gehrels, N.; Goegues, E.
    We present several cases of optical observations during gamma-ray bursts (GRBs) which resulted in prompt limits but no detection of optical emission. These limits constrain the prompt optical flux densities and the optical brightness relative to the gamma-ray emission. The derived constraints fall within the range of properties observed in GRBs with prompt optical detections, although at the faint end of optical/gamma-ray flux ratios. The currently accessible prompt optical limits do not require a different set of intrinsic or environmental GRB properties, relative to the events with prompt optical detections.