Fermi-GBM Analysis of GRB 221009A
Document Type
Conference Proceeding
Publication Date
9-27-2024
Abstract
At 13:16:59.99 UT on October 9th, 2022, the Fermi Gamma-ray Burst Monitor (GBM) triggered on gamma-ray burst (GRB) 221009A. This GRB has the highest fluence value GBM has ever detected. The light curve consists of two distinct emission episodes, a single isolated peak with a thermal spectra followed by a longer, extremely bright, multi-pulsed event with a non-thermal spectra. The two main peaks of the second event, from t0+218 to t0+276 seconds and t0+508 to t0+513 s, had such high photon rates they caused pulse-pile up effects in the GBM detectors. Afterglow emission is detectable in the GBM energy range out to t0+1467 seconds when the field of view was occulted by Earth. Here we present the key parts of our spectrotemporal analysis for the triggering pulse, prompt emission, and afterglow and the pulse pile-up corrected energetics for the this historically bright event.
Publication Source (Journal or Book title)
Proceedings of Science
Recommended Citation
Lesage, S., Veres, P., Veres, P., Briggs, M., Goldstein, A., Kocevski, D., Burns, E., Wilson-Hodge, C., Bhat, P., Huppenkothen, D., Fryer, C., Hamburg, R., Racusin, J., Bissaldi, E., Cleveland, W., Dalessi, S., Fletcher, C., Giles, M., Hristov, B., Hui, C., Mailyan, B., Malacaria, C., Poolakkil, S., Roberts, O., von Kienlin, A., Wood, J., Ajello, M., Arimoto, M., Baldini, L., Ballet, J., Baring, M., Bastieri, D., & Becerra Gonzalez, J. (2024). Fermi-GBM Analysis of GRB 221009A. Proceedings of Science, 444 Retrieved from https://repository.lsu.edu/physics_astronomy_pubs/6630