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Featured researches published by A Goyal.


Journal of Physics G | 2012

TeV gamma-ray observations of Markarian 421 using TACTIC during 2009–10

P. Chandra; R. C. Rannot; K. K. Yadav; A. K. Tickoo; K K Singh; K. Chanchalani; M. Kothari; N K Agarwal; A Goyal; H. C. Goyal; S. Kotwal; N. Kumar; P Marandi; K. Venugopal; C K Bhat; Nilay Bhatt; S Bhattacharya; C Borwankar; N Chouhan; V. K. Dhar; S R Kaul; S K Koul; M. K. Koul; R. Koul; A K Mitra; S. Sahayanathan; M. Sharma

We have observed the blazar Markarian 421 with the TACTIC γ-ray telescope at Mt. Abu, India, from 22 November 2009 to 16 May 2010 for 265 h. Detailed analysis of the data so recorded revealed the presence of a TeV γ-ray signal with a statistical significance of 12.12σ at Eγ ⩾ 1 TeV. We have estimated the time-averaged differential energy spectrum of the source in the energy range 1.0–16.44 TeV. The spectrum fits well with the power-law function of the form (dF/dE = f0E−Γ) with f0 = (1.39 ± 0.239) × 10−11 cm−2 s−1 TeV−1 and Γ = 2.31 ± 0.14.


Pramana | 2014

Long term performance evaluation of the TACTIC imaging telescope using ∼400 h Crab Nebula observation during 2003–2010

A. K. Tickoo; R. Koul; R. C. Rannot; K. K. Yadav; P. Chandra; V. K. Dhar; M. K. Koul; M. Kothari; N K Agarwal; A Goyal; H. C. Goyal; S. Kotwal; N. Kumar; P Marandi; K. Venugopal; K. Chanchalani; Nilay Bhatt; S. Bhattacharyya; C Borwankar; N Chouhan; S R Kaul; Abhas Mitra; S. Sahaynathan; M. Sharma; K K Singh; C K Bhat


New Astronomy | 2017

Multiwavelength study of VHE emission from Markarian 501 using TACTIC observations during April–May, 2012

P. Chandra; K.K. Singh; R. C. Rannot; K. K. Yadav; H. Bhatt; A. K. Tickoo; B. Ghosal; M. Kothari; K.K. Gaur; A Goyal; H. C. Goyal; N. Kumar; P Marandi; N Chouhan; S. Sahayanathan; K. Chanchalani; N K Agarwal; V. K. Dhar; S R Kaul; M. K. Koul; R. Koul; K. Venugopal; C K Bhat; C Borwankar; Jai Bhagwan; Alok C. Gupta


New Astronomy | 2017

A time dependent approach to model X-ray and γ–ray light curves of Mrk 421 observed during the flare in February 2010

K.K. Singh; S. Sahayanathan; A Sinha; N. G. Bhatt; A. K. Tickoo; K. K. Yadav; R. C. Rannot; P. Chandra; K. Venugopal; P Marandi; N. Kumar; H. C. Goyal; A Goyal; N K Agarwal; M. Kothari; K. Chanchalani; V. K. Dhar; N Chouhan; C K Bhat; M. K. Koul; R. Koul


Astroparticle Physics | 2017

VHE observation of Mrk 421 with TACTIC during 2012; multiwavelength study

B. Ghosal; K. K. Yadav; K K Singh; R. C. Rannot; A. K. Tickoo; P. Chandra; H. Bhatt; K.K. Gaur; A Goyal; H. C. Goyal; N. Kumar; P Marandi; M. Kothari; S. Sahayanathan; K. Chanchalani; N K Agarwal; V. K. Dhar; S R Kaul; M. K. Koul; R. Koul; K. Venugopal; C K Bhat; C Borwankar; N Chouhan


New Astronomy | 2015

Search for TeV γ-ray emission from blazar 1ES1218+304 with TACTIC telescope during March–April 2013

K.K. Singh; K. K. Yadav; A. K. Tickoo; R. C. Rannot; P. Chandra; N K Agarwal; K.K. Gaur; A Goyal; H. C. Goyal; N. Kumar; P Marandi; M. Kothari; H. Bhatt; K. Chanchalani; N Chouhan; V. K. Dhar; B. Ghosal; S R Kaul; M. K. Koul; R. Koul; K. Venugopal; C K Bhat; C Borwankar; Jai Bhagwan; Alok C. Gupta


New Astronomy | 2019

TeV γ-ray emission from Mrk 421 observed with TACTIC during December 2014–February 2015

K. K. Yadav; K. Chanchalani; K.K. Singh; B. Ghosal; P. Chandra; R. C. Rannot; A. K. Tickoo; N K Agarwal; M. Kothari; K.K. Gaur; H. C. Goyal; A Goyal; N. Kumar; P Marandi; S R Kaul; V. K. Dhar; M. K. Koul; R. Koul; K. Venugopal; C K Bhat; N Chouhan; C Borwankar


New Astronomy | 2018

Search for very high energy gamma-ray emission from the peculiar radio galaxy IC 310 with TACTIC during 2012 to 2015

B. Ghosal; K.K. Singh; K. K. Yadav; A. K. Tickoo; R. C. Rannot; P. Chandra; M. Kothari; K.K. Gaur; H. C. Goyal; A Goyal; N. Kumar; P Marandi; K. Chanchalani; N K Agarwal; V. K. Dhar; M. K. Koul; R. Koul; K. Venugopal; C K Bhat; N Chouhan; C Borwankar; S R Kaul; H. Bhatt; A. Agarwal; Alok C. Gupta


Monthly Notices of the Royal Astronomical Society | 2018

Multiwavelength study of Fermi hard spectrum blazar B2 0806+35 using Swift, Fermi, and TACTIC observations

S. Bhattacharyya; B. Ghosal; P. Chandra; K.K. Singh; K. K. Yadav; A. K. Tickoo; R. C. Rannot; N. Kumar; P Marandi; N K Agarwal; M. Kothari; K K Gour; H. C. Goyal; A Goyal; N Chauhan; C Borwankar; V. K. Dhar; M. K. Koul; R. Koul; K. Venugopal; K. Chanchalani; C K Bhat; M. Sharma; Nilay Bhatt


Astroparticle Physics | 2018

Study of short term enhanced TeV γ- ray emission from Mrk 421 observed with TACTIC on December 28, 2014

K.K. Singh; K. K. Yadav; K. Chanchalani; P. Chandra; B. Ghosal; A. K. Tickoo; R. C. Rannot; P Marandi; N K Agarwal; M. Kothari; K K Gour; H. C. Goyal; A Goyal; N. Kumar; C Borwankar; S R Kaul; V. K. Dhar; M. K. Koul; R. Koul; K. Venugopal; C K Bhat; N Chouhan

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A. K. Tickoo

Bhabha Atomic Research Centre

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C K Bhat

Bhabha Atomic Research Centre

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H. C. Goyal

Bhabha Atomic Research Centre

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K. K. Yadav

Bhabha Atomic Research Centre

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M. K. Koul

Bhabha Atomic Research Centre

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M. Kothari

Bhabha Atomic Research Centre

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N K Agarwal

Bhabha Atomic Research Centre

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R. C. Rannot

Bhabha Atomic Research Centre

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R. Koul

Bhabha Atomic Research Centre

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V. K. Dhar

Bhabha Atomic Research Centre

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