Sarah Dalessi
A5016724149- Gamma-ray bursts and supernovae
- Astrophysical Phenomena and Observations
- Astro and Planetary Science
- Particle Detector Development and Performance
- Pulsars and Gravitational Waves Research
- Stellar, planetary, and galactic studies
- Advanced X-ray and CT Imaging
- Astrophysics and Cosmic Phenomena
University of Alabama in Huntsville
2023-2024
Abstract GRB 221009A has been referred to as the brightest of all time (BOAT). We investigate veracity this statement by comparing it with a half century prompt gamma-ray burst observations. This is ever detected measures peak flux and fluence. Unexpectedly, highest isotropic-equivalent total energy identified, while luminosity at ∼99th percentile known distribution. explore how such can be powered discuss potential implications for ultralong high-redshift bursts. By geometric extrapolation...
Abstract We report the discovery of GRB 221009A, highest flux gamma-ray burst (GRB) ever observed by Fermi Gamma-ray Burst Monitor (Fermi-GBM). This has continuous prompt emission lasting more than 600 s, which smoothly transitions to afterglow visible in Fermi-GBM energy range (8 keV–40 MeV), and total energetics higher any other sample. By using a variety new existing analysis techniques we probe spectral temporal evolution 221009A. find no prior trigger time ( t 0 ; 2022 October 9 at...
Abstract GW230529 is the first compact binary coalescence detected by LIGO–Virgo–KAGRA collaboration with at least one component mass confidently in lower gap, corresponding to range 3–5 M ⊙ . If interpreted as a neutron star–black hole merger, this event has most symmetric ratio so far and therefore relatively high probability of producing electromagnetic (EM) emission. However, no EM counterpart been reported. At merger time t 0 , Swift-BAT Fermi-GBM together covered 100% sky. Performing...
GW230529 is the first compact binary coalescence detected by LIGO-Virgo-KAGRA collaboration with at least one component mass confidently in lower mass-gap, corresponding to range 3-5$M_{\odot}$. If interpreted as a neutron star-black hole merger, this event has most symmetric ratio so far and therefore relatively high probability of producing electromagnetic (EM) emission. However, no EM counterpart been reported. At merger time $t_0$, Swift-BAT Fermi-GBM together covered 100$\%$ sky....