2025ApJ...985..239Y

Query : 2025ApJ...985..239Y

2025ApJ...985..239Y - Astrophys. J., 985, 239 (2025/June-1)

Evidence of Minijet Emission in a Large Emission Zone from a Magnetically Dominated Gamma-Ray Burst Jet.

YI S.-X., WANG C.-W., SHAO X., MORADI R., GAO H., ZHANG B., XIONG S.-L., ZHANG S.-N., TAN W.-J., LIU J.-C., XUE W.-C., ZHANG Y.-Q., ZHENG C., WANG Y., ZHANG P., AN Z.-H., CAI C., FENG P.-Y., GONG K., GUO D.-Y., HUANG Y., LI B., LI X.-B., LI X.-Q., LIU X.-J., LIU Y.-Q., MA X., PENG W.-X., QIAO R., SONG L.-M., WANG J., WANG P., WANG Y., WEN X.-Y., XIAO S., XU Y.-B., YANG S., YI Q.-B., ZHANG D.-L., ZHANG F., ZHANG H.-M., ZHANG J.-P., ZHANG Z., ZHAO X.-Y., ZHAO Y. and ZHENG S.-J.

Abstract (from CDS):

The second brightest gamma-ray burst (GRB) in history, GRB 230307A, provides an ideal laboratory to study the mechanism of GRB prompt emission thanks to its extraordinarily high photon statistics and its single-episode activity. Here we demonstrate that the rapidly variable components of its prompt emission compose an overall broad single pulse-like profile. Although these individual rapid components are aligned in time across all energy bands, this overall profile conspires to show a well-defined energy-dependent behavior that is typically seen in single GRB pulses. Such a feature demonstrates that the prompt emission of this burst is from many individual emitting units that are casually linked in a emission site at a large distance from the central engine. Such a scenario is in natural consistency with the internal-collision-induced magnetic reconnection and turbulence framework, which invokes many minijets due to local magnetic reconnection that constantly appear and disappear in a global magnetically dominated jet.

Abstract Copyright: © 2025. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Gamma-ray bursters - Gamma-ray transient sources

Simbad objects: 1

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Number of rows : 1
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 GRB 230307A gB 04 03 26.24 -75 22 43.8           ~ 221 0

Query : 2025ApJ...985..239Y

Basic data :
GRB 230307A -- Gamma-ray Burst
Other object types: otypes_help 		gB (GRB,Fermi), ev (AT)
ICRS coord. (ep=J2000) : 		04 03 26.24 -75 22 43.8 (X-ray) [ 3200 3200 ] D SWIFT
FK4 coord. (ep=B1950 eq=1950) : 		04 04 37.67 -75 30 49.8 [ 3200 3200 ]
Gal coord. (ep=J2000) : 		289.47808 -36.26654 [ 3200 3200 ]
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Identifiers (3) :
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GRB 230307A AT 2023vfi Fermi bn230307656

References (221 between 1850 and 2026) (Total 221)
Simbad bibliographic survey began in 1850 for stars (at least bright stars) and in 1983 for all other objects (outside the solar system).
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