INTEGRAL view of GRB 221009A. Prompt energetics and week-long hard X-ray afterglow
Mereghetti, Sandro; Tiengo, Andrea; Kuulkers, Erik; Ferrigno, Carlo; Laurent, Philippe; Savchenko, Volodymyr; Ubertini, Pietro; Bazzano, Angela; Craig Rodi, James; Jourdain, Elisabeth; Roques, Jean-Pierre; Martin-Carrillo, Antonio; Hanlon, Lorraine; Gotz, Diego
Switzerland, Italy, France, Ireland, Netherlands
Abstract
The gamma-ray burst GRB 221009A is among the most luminous of its kind and its proximity to Earth has made it an exceptionally rare observational event. The International Gamma-ray Astrophysics Laboratory (INTEGRAL) was in an optimal aspect position to use its all-sky instruments for recording the prompt emission and early gamma-ray afterglow in unprecedented detail. Following the initial detection, a swiftly scheduled follow-up observation allowed for the hard X-ray afterglow time and spectral evolution to be observed for up to almost a week. The INTEGRAL hard X-ray and soft gamma-ray observations have started to bridge the energy gap between the traditionally well-studied soft X-ray afterglow and the high-energy afterglow observed by Fermi/LAT. We discuss the possible implications of these observations for follow-ups of multi-messenger transients with hard X-ray and gamma-ray telescopes.