On April 14, 2009, the AGILE satellite detected a as the best candidate counterpart, based on positional coincidence and a similar temporal behaviour. Aside from this hint, no SFXT has been firmly detected at high energies to date. Overall, SFXTs comprise a subclass of high-mass X-ray binaries (HMXBs) that host a massive OB supergiant star as a companion donor. They tend to display the most extreme X-ray variability among HMXBs. These systems might be able to emit photons at MeV-TeV energies in the form of fast flares lasting from hours to a few days, with a low-duty cycle. flare from an unknown transient source. Subsequent X-ray follow-up observations with Swift and INTEGRAL identified the supergiant fast X-ray transient (SFXT) In this work, we analyse archival AGILE data to search for and evaluate their possible physical origin. flares consistent with We identified a transient source, , which emitted 19 . Most flares, detected on a SI flares and was seen to be positionally consistent with 1 timescale, concentrate most of their emission on two, four, and six hour timescales, resembling those observed in the X-ray band from . An orbital phase analysis revealed that approximately half of the and , offering evidence that SFXTs could constitute a new class of Galactic high-energy transient emitters. activity occurs around the apastron passage of the compact object hosted in the binary system. We also incorporated archival Swift and INTEGRAL observations to provide phase-folded light curves at lower energies. Our collected results strongly support a physical association between
Bulgarelli et al. (Tue,) studied this question.