English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

We report on observations of correlated behavior between the prompt gamma-rayand optical emission from GRB 080319B, which confirm that (i) they occurredwithin the same astrophysical source region and (ii) their respective radiationmechanisms were dynamically coupled. Our results, based upon a new CCFmethodology for determining the time-resolved spectral lag, are summarized asfollows. First, the evolution in the arrival offset of prompt gamma-ray photoncounts between Swift-BAT 15-25 keV and 50-100 keV energy bands (intrinsicgamma-ray spectral lag) appears to be anti-correlated with the arrival offsetbetween prompt 15-350 keV gamma-rays and the optical emission observed byTORTORA (extrinsic optical/gamma-ray spectral lag), thus effectivelypartitioning the burst into two main episodes at ~T+28+/-2 sec. Second, therise and decline of prompt optical emission at ~T+10+/-1 sec and ~T+50+/-1 sec,respectively, both coincide with discontinuities in the hard to soft evolutionof the photon index for a power law fit to 15-150 keV Swift-BAT data at~T+8+/-2 sec and ~T+48+/-1 sec. These spectral energy changes also coincidewith intervals whose time-resolved spectral lag values are consistent withzero, at ~T+12+/-2 sec and ~T+50+/-2 sec. These results, which are robustacross heuristic permutations of Swift-BAT energy channels and varying temporalbin resolution, have also been corroborated via independent analysis ofKonus-Wind data. This potential discovery may provide the first observationalevidence for an implicit connection between spectral lags and GRB emissionmechanisms in the context of canonical fireball phenomenology. Future workincludes exploring a subset of bursts with prompt optical emission to probe theunique or ubiquitous nature of this result.

The Correlation of Spectral Lag Evolution with Prompt Optical Emission in GRB 080319B