The 1st INTEGRAL SPI-ACS gamma-ray burst catalogue

Rau, A.; Kienlin, A. von; Hurley, K.; Lichti, G.

doi:10.1051/0004-6361:20053159

Cited by 58 publications

(60 citation statements)

References 34 publications

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“…520 open clusters cataloged by . 388 GRBs seen by INTEGRAL up to the submission time of Rau et al (2005), an average rate of 0.3 per day, very close to what was forecast from BATSE data. INTEGRAL is sensitive the 11 known isotopes of Einsteinium, 254 Es has the longest half life, 276 days, comparable perhaps with the interval between the writing of this (Christmas 2005) and your first chance to read it.…”

supporting

confidence: 70%

Astrophysics in 2005

Trimble

Aschwanden

Hansen

2006

PUBL ASTRON SOC PAC

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ABSTRACT. We bring you, as usual, the Sun and Moon and stars, plus some galaxies and a new section on astrobiology. Some highlights are short (the newly identified class of gamma-ray bursts, and the Deep Impact on Comet 9P/Tempel 1), some long (the age of the universe, which will be found to have the Earth at its center), and a few metonymic, for instance the term "down-sizing" to describe the evolution of star formation rates with redshift.

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supporting

confidence: 70%

Astrophysics in 2005

Trimble

Aschwanden

Hansen

2006

PUBL ASTRON SOC PAC

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“…It is possible to use high energy cosmic-ray events -which leave their traces in both the ACS and the germanium detectors at the same time -to cross check the two clocks. Sometimes a very short spike (one or two bins) in ACS count rate and the saturation of one or more germanium detectors can happen simultaneously [6] (Fig. 3), when, for instance, an energetic cosmic-ray particle deposits its energy partly in the ACS, and partly in one or more germanium detectors.…”

Section: Maskmentioning

confidence: 99%

SPI-ACS timing: cross-check of onboard clocks

Rau

Kienlin

Hurley³

2011

Proceedings of 8th INTEGRAL Workshop “The Restless Gamma-Ray Universe” — PoS(INTEGRAL 2010)

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The SPI-ACS is an important component in the InterPlanetary Network, which utilizes Gammaray satellites to localize Gamma Ray Bursts through triangulation. For this purpose, it is important to know the accuracy of the ACS onboard clock. The SPI germanium detectors use a different clock, therefore we can calibrate the ACS clock with the SPI detector clock. In this study we use high energy cosmic-ray events which cause spikes in the ACS and at the same time saturate one or more SPI germanium detectors. We collect such events from more than 900 revolutions, obtain the distribution of the time difference between ACS spikes and corresponding SPI saturations, and compare the result with a Monte-Carlo simulation. We conclude that the ACS on board clock does not have significant drift with respect to the SPI detector clock.

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“…The first attempt to systematically study GRBs with SPI-ACS was done by Rau et al (2005) using about 800 days of data. This study considered 179 GRBs also detected by other satellites, but visible in the SPI-ACS.…”

Section: Introductionmentioning

confidence: 99%

“…This study considered 179 GRBs also detected by other satellites, but visible in the SPI-ACS. Unlike Rau et al (2005), we primarly rely on identification of the GRBs based solely on the ACS data, so that our GRB sample is not dependent on the data of other satellites. This allows us to perform a study of the timing properties of GRBs, which is not affected by the selection biases (sensitivity, trigger configurations) of other telescopes.…”

Section: Introductionmentioning

confidence: 99%

Timing properties of gamma-ray bursts detected by SPI-ACS detector onboard INTEGRAL

Savchenko

Neronov

Courvoisier

2012

A&A

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Aims. We study timing properties of a large sample of gamma-ray bursts (GRB) detected by the anti-coincidence shield (ACS) of the SPI spectrometer of INTEGRAL telescope. Methods. We identify GRB-like events in the SPI-ACS data. The data set under investigation is the history of count rate of the SPI-ACS detector recorded with a binning of 50 ms over the time span of ∼10 yr. In spite of the fact that SPI-ACS does not have imaging capability, it provides high statistics signal for each GRB event, because of its large effective area.Results. We classify all isolated excesses in the SPI-ACS count rate into three types: short spikes produced by cosmic rays, GRBs and Solar flare induced events. We find some ∼1500 GRB-like events in the 10 yr exposure. A significant fraction of the GRB-like events identified in SPI-ACS occur in coincidence with triggers of other gamma-ray telescopes and could be considered as confirmed GRBs. We study the distribution of durations of the GRBs detected by SPI-ACS and find that the peak of the distribution of long GRBs is at 20 s, i.e. somewhat shorter than for the long GRBs detected by BATSE. Contrary to the BATSE observation, the population of short GRBs does not have any characteristic timescale. Instead, the distribution of durations extends as a powerlaw to the shortest timescale accessible for SPI-ACS, ≤50 ms. We also find that a large fraction of long GRBs has a characteristic variability timescale of the order of 1 s. We discuss the possible origin of this timescale.

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The 1st INTEGRAL SPI-ACS gamma-ray burst catalogue

Cited by 58 publications

References 34 publications

Astrophysics in 2005

Astrophysics in 2005

SPI-ACS timing: cross-check of onboard clocks

Timing properties of gamma-ray bursts detected by SPI-ACS detector onboard INTEGRAL

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