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The INTEGRAL SPI instrument observes the hard X-ray sky from 20 keV up to afew MeV since more than 15 years. In this energy domain, the main emitters arecompact objects for which SPI provides spectral information of prime interest.Recently, two transient sources reached very unusual flux levels and have beendetected up to a few hundreds of keV with a high significance level. A drasticreduction of the systematic errors is thus required to obtain reliable spectra.This objective is achieved through an analysis including a detailedunderstanding of the instrument behavior. This paper presents both aspects ofthe data analysis: we first give a basic description of the instrumentalissues, then we present the solution to be implemented in the SPI data analysis(at the event selection stage) and illustrate with a few examples thereliability of the SPI results in the high-energy domain when the data analysisis performed properly. We take benefit from this refined analysis procedure topropose an updated model of the hard X-ray spectral shape of the Crab Nebula.We revisit the high-energy emission observed in GS2023+338 spectra during its2015 outburst and present the first results from the SPI observations dedicatedto the recently discovered transient MAXI J1820+070.

astrophysical journal/the astrophysical journal

On the high-energy emissions of compact objects observed with INTEGRAL  SPI: Event selection impact on source spectra and scientific results for the  bright sources Crab Nebula, GS2023+338 and MAXI J1820+070