Precursors of Short Gamma-Ray Bursts in the SPI-ACS/INTEGRAL Experiment

Understand

We have analyzed the light curves of 519 short gamma-ray bursts (GRBs) detected in the SPI-ACS/INTEGRAL experiment from December 2002 to May 2014 to search for precursors.

• Both the light curves of 519 individual events and the averaged light curve of 372 brightest bursts have been analyzed.
• In a few cases, we have found and thoroughly studied precursor candidates based on SPI-ACS/INTEGRAL, GBM/Fermi, and LAT/Fermi data.
• A statistical analysis of the averaged light curve for the entire sample of short bursts has revealed no regular precursor.