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B. S. Acharya

Tata Institute of Fundamental Research

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Featured researches published by B. S. Acharya.

Astronomy and Astrophysics | 2012

Multiwavelength study of the TeV blazar Mrk 421 during a giant flare

A. Shukla; V. R. Chitnis; P. R. Vishwanath; B. S. Acharya; G. C. Anupama; P. Bhattacharjee; R. J. Britto; T. P. Prabhu; L. Saha; B. B. Singh

The radiation mechanism of very high energy

The Astrophysical Journal | 2014

MULTI-FREQUENCY, MULTI-EPOCH STUDY OF Mrk 501: HINTS FOR A TWO-COMPONENT NATURE OF THE EMISSION

A. Shukla; V. R. Chitnis; B. B. Singh; B. S. Acharya; G. C. Anupama; P. Bhattacharjee; R. J. Britto; K. Mannheim; T. P. Prabhu; L. Saha; P. R. Vishwanath

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Astronomy and Astrophysics | 2015

Underlying particle spectrum of Mkn 421 during the huge X-ray flare in April 2013

Atreyee Sinha; Amit Shukla; Ranjeev Misra; V. R. Chitnis; A. R. Rao; B. S. Acharya

-ray emission from blazars and crucial parameters like magnetic field, and size of the emitting region are not well understood yet. To understand the above mentioned properties of blazars, we observed five nearby TeV

Astronomy and Astrophysics | 2016

Long-term study of Mkn 421 with the HAGAR Array of Telescopes

Atreyee Sinha; A. Shukla; L. Saha; B. S. Acharya; G. C. Anupama; P. Bhattacharjee; R. J. Britto; V. R. Chitnis; T. P. Prabhu; B. B. Singh; P. R. Vishwanath

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The Astrophysical Journal | 2017

On the Spectral Curvature of VHE Blazar 1ES 1011+496: Effect of Spatial Particle Diffusion

Atreyee Sinha; S. Sahayanathan; B. S. Acharya; G. C. Anupama; V. R. Chitnis; B. B. Singh

-ray emitting blazars (Mrk421, Mrk501, 1ES2344+514, 1ES1218+304 and 3C454.3) and one radio galaxy (M87) using the High Altitude GAmma Ray (HAGAR) telescope. HAGAR is an array of seven telescopes located at Hanle, India to detect Cherenkov light caused by extensive air showers initiated by

The Astrophysical Journal | 2016

DETECTION OF VERY HARD γ-RAY SPECTRUM FROM THE TEV BLAZAR MRK 501

Amit Shukla; K. Mannheim; V. R. Chitnis; J. Roy; B. S. Acharya; D. Dorner; G. Hughes; A. Biland

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Chinese Journal of Astronomy and Astrophysics | 2008

Simultaneous Multi-Wavelength Observations of the TeV Blazar Mrk 421 during February − March, 2003: X-Ray and NIR Correlated Variability ∗

Alok C. Gupta; B. S. Acharya; Debanjan Bose; V. R. Chitnis; J. H. Fan

-rays. Mrk421 was observed to undergo one of its brightest flaring episodes on 2010 February 17, and detected by various experiments in X-rays and

The Astrophysical Journal | 2016

THE MULTI-WAVELENGTH CHARACTERISTICS OF THE TeV BINARY LS I+61°303

L. Saha; V. R. Chitnis; Amit Shukla; A. R. Rao; B. S. Acharya

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Astroparticle Physics | 2003

Angular resolution of the Pachmarhi array of Čerenkov telescopes

P. Majumdar; B. S. Acharya; P. N. Bhat; V. R. Chitnis; M. A. Rahman; B. B. Singh; P. R. Vishwanath

- rays. HAGAR observations of this source during 2010 February 13 - 19, in the energies above 250 GeV show an enhancement in the flux level, with a flux of 6-7 Crab units being detected on 2010 February 17. We present the spectral energy distribution of the source during this flaring episode. In addition to this, the analysis procedure to extract

arXiv: Astrophysics | 2000