Search for GRB precursors in the Swift/BAT archive

Journal Article · Mon May 25 00:00:00 EDT 2009 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.3155928· OSTI ID:21304961

Calderone, G ^[1]; Romano, P; Mangano, V; Cusumano, G; Troja, E ^[2]

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1. DSFA-University of Palermo, via Archirafi 33, 90123 Palermo (Italy)
2. INAF-IASF, via Ugo La Malfa 153, 90146 Palermo (Italy)

Some GRBs are characterized by emission episodes occurring before the main event, called precursors. Their emission intensity is usually weaker than the GRB and is often comparable to (or slightly greater than) the background noise, making their detection difficult. We developed a code to automatically detect such precursors and applied it to a sample of 281 Swift/BAT GRBs. The identification procedure of precursor candidates uses a detection algorithm based on the wavelet transforms, and relies on an accurate study of the BAT background noise properties. A rigorous statistical approach is used for detection threshold settings and detection significance evaluation. We show the preliminary results of the analysis.

• OSTI ID: 21304961
• Journal Information: AIP Conference Proceedings, Vol. 1133, Issue 1; Conference: 6. Huntsville symposium on gamma-ray burst, Huntsville, AL (United States), 20-23 Oct 2008; Other Information: DOI: 10.1063/1.3155928; (c) 2009 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
99 GENERAL AND MISCELLANEOUS//MATHEMATICS, COMPUTING, AND INFORMATION SCIENCE
ALGORITHMS
BACKGROUND NOISE
COSMIC GAMMA BURSTS
COSMIC GAMMA SOURCES
COSMIC PHOTONS
DATA ANALYSIS
EVALUATION
GAMMA ASTRONOMY
GAMMA DETECTION
PHOTON EMISSION
PRECURSOR
TELESCOPE COUNTERS