INTEGRAL observations of magnetars

TL;DR

This paper presents a comprehensive analysis of magnetars using 20+ years of INTEGRAL satellite data, focusing on their persistent hard X-ray emission evolution and short burst activity, especially in SGR J1935+2154.

Contribution

It provides new insights into the long-term behavior of magnetars' hard X-ray emission and reports a sensitive search for short bursts using the latest calibration methods.

Findings

Long-term evolution of magnetar X-ray flux characterized.

Detection of short bursts in SGR J1935+2154.

Enhanced understanding of magnetar emission properties.

Abstract

The INTEGRAL satellite has collected a large amount of data on magnetars in our Galaxy, spanning more than 20 years starting from 2003. The large data set obtained with the IBIS/ISGRI instrument at energies above 20 keV allows us to study both the properties and long-term evolution of their persistent hard X-ray emission and the population characteristics of the short bursts emitted during active periods. We are carrying out a comprehensive analysis of the observed magnetars, exploiting the most recent calibrations and analysis software. Here we report on the long term evolution of the hard X-ray flux of the magnetars detected with ISGRI and the results of a sensitive search for short bursts in SGR J1935+2154.