Data analysis for burst signals

Burst signals have time duration small compared to the observation time.

They are emitted, for example, in the collapse of a star, leading to a supernova explosion, in the final stage of the coalescence of two collapsed objects (two neutron stars, two black holes, or one of each), or in case massive black holes eat surrounding objects.

The sensitivity of the detectors to burst signals is a function of its noise spectral amplitude (1/sqrt(Hz)) and bandwidth.
It may be expressed in terms of effective temperature [K] or in terms of h the dimensionless amplitude, for a 1 ms burst. On the detector sensitivity to bursts

The figures show an example of functioning of Explorer during June 2001
and of Nautilus during July 2001

The figure shows the OPERATION TIMES of the two detectors, Explorer -896 days- (blue) and Nautilus -766 days- (green)
from Jan 1997 to 21 May 2002

Next figures show the sensitivities to bursts of the two detectors, Explorer and Nautilus
from Jan 1997 to Dec 2000

Due to the weakness of the signals the use of suitable data analysis tecniques is required to increase the Signal to noise ratio. We use filters matched to a delta signal
On the matched filter for g.w. bursts

Various papers have been done to study the filter performances, using the detectors noise and adding delta-like signals to the noise. Here you can find some papers on:

The fast matched filter for g.w. data analysis:characteristics and applications (Nuovo Cimento C, 1997)

Time dispersion and efficiency of detection for signals in g.w. experiments (PRD 62,2000)

Linear filtering for the detection of short bursts of g. r. ( S. D' Antonio,4th Amaldi Conf., Perth,2001- CQG 19,7, 2002)

The main point of the burst detection is the need for coincidence analysis between two or more detectors. Here you can find some papers on:

``Study of coincidences between the g.w. detectors Explorer and Nautilus in the year 2001'' (CQG 19 (2002) 5449-5463 and gr-qc/0210053)

Search for gravitational radiation with the Allegro and Explorer detectors (PRD 59, 122001 (1999))

Search for Coincident Excitation of the widely Spaced Resonant G.W. detectors Explorer, Nautilus and Niobe (AstroParticle Physics 10,1 (1999))

First search for gravitational wave bursts with a network of detectors (PRL 85, 5046-5050, 2000 )

Initial operation of the International gravitational event collaboration (International Journal of Mod. Phys. D,9 (2000))
( Visit the IGEC web site! )

On upper limits for g.w. radiation (AstroParticle Physics 16, 441-450 (2002))

Study of coincidences between resonant g.w. detectors (CQG 18,2,243-251, 2001)

Coincidence analysis in g.w. experiments ( P. Astone et al,4th Amaldi Conf., Perth,2001- CQG 19,7 (2002)

Search for gravitational wave bursts by the network of resonant detectors (presented by G. Prodi at the 4th Amaldi Conf., Perth,2001- CQG 19,7,2002)

Background estimation in a gravitational wave experiment (International Journal of Mod. Phys. D,9 (2000))

The DAGA_HF filters : this is the ppt file of the presentation by S. D' Antonio at the GWDAW 2001 (Trento, Dec 2001)

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