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9 papers

astro-ph.HE2026

Fast optical spectroscopic observations of PSR J1023+0038 over one orbital period

M. M. Messa, M. C. Baglio, P. D'Avanzo +8

The paper presents minute‑resolution optical spectroscopy of the transitional millisecond pulsar PSR J1023+0038 over a full orbit, revealing rapid changes in emission‑line properti…

astro-ph.HE2026

High-redshift GRB 140304A at z = 5.282 with flaring activity: A multi-wavelength study

Shashi. B. Pandey, Amit. K. Ror, A. J. Castro-Tirado +48

Context. This article presents a detailed multi-wavelength analysis of GRB 140304A at z = 5.282, having uncommon late-time flaring features. The aim is to study GRB 140304A and oth…

astro-ph.SR2026

Ellipsoidal modulation and multi-wavelength activity in the pre-cataclysmic binary RX J1553.0+4457

S. -Y. Wu, M. Gritsevich, Q. -H. Lao +39

RX J1553.0+4457 (TMTS J15530469+4457458) is a detached post-common-envelope binary containing a cool white dwarf and an active late-type companion. We present a multi-wavelength st…

astro-ph.SR2026

Stochastic Optical Variability and an rms-flux Relation in the Intermediate Polar EP240309a

S. -Y. Wu, Y. -D. Hu, I. Perez-Garcia +18

Magnetic cataclysmic variables provide a natural laboratory for studying how accretion interacts with compact-object magnetospheres and generates stochastic variability. We present…

astro-ph.HE2025

Extremely luminous optical afterglow of an energetic gamma-ray burst GRB 230204B

Rahul Gupta, Judith Racusin, Vladimir Lipunov +47

Robotic telescope networks play an important role in capturing early and bright optical afterglows, providing critical insights into the energetics and emission mechanisms of GRBs.…

astro-ph.HE2025

Discovery and Analysis of Afterglows from Poorly Localised GRBs with the Gravitational-wave Optical Transient Observer (GOTO) All-sky Survey

Amit Kumar, B. P. Gompertz, B. Schneider +86

Gamma-ray bursts (GRBs), particularly those detected by wide-field instruments such as the Fermi/GBM, pose a challenge for optical follow-up due to their large initial localisation…