2024/01/18 by Zhavlonbek Abdullayev, Abdullayev, Zhavlonbek, Toktarkhan Komesh +13 · 1 citation
Physics and Astronomy · #FOS: Physical sciences #Gamma-ray bursts and supernovae #High Energy Astrophysical Phenomena (astro-ph.HE)
paper · pdf · doi:10.48550/arxiv.2401.09805
openalex publication_date 2024/01/18 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Optical broad-band spectral shape measurements of gamma-ray bursts (GRBs) are typically made starting an hour or more after the trigger event. With our automated, rapid-response system, the Burst Simultaneous Three-channel Imager (BSTI) on the Nazarbayev University Transient Telescope at Assy-Turgen Astrophysical Observatory (NUTTelA-TAO), we began measurements of GRB200925B 129 s after the Swift BAT trigger. The temporal decay log slopes in the g', r', and i' bands in the time interval 129 s to 1029 s are -0.43 ± 0.31, -0.43 ± 0.15, and -0.72 ± 0.14, respectively. During the decay phase, a shift in color from red to blue, a change in log slope of \beta from -2.73 to -1.52 was measured. The evolution in the optical spectral slope is consistent with a decrease in extinction caused by dust destruction.