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Browsing by Author "Bhat, C. L"

Browsing by Author "Bhat, C. L"

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  • Energy resolution of the TACTIC imaging element 
    Sathyabama, N; Dhar, V. K; Koul, M. K; Bhat, C. L (Astronomical Society of India, 2001)
    We explore here the possibility of using artificial neural network (ANN) for characterization of atmospheric Cerenkov events (progenitor type and energy) detected by the imaging gamma-ray telescope array, TACTIC.
  • Energy Sensitive Search for Pulsed Photons from Crab Pulsar using the TACTIC Imaging Element 
    Rannot, R. C; Yadav, K. K; Dhar, V. K; Tickoo, A. K; Bhatt, N; Bhattacharyya, S; Chandra, P; Goyal, H. C; Kaul, C. L; Kaul, R. K; Kothari, M; Kotwal, S; Koul, R; Sahayanathan, S; Sapru, M. L; Sharma, M; Venugopal, K; Bhat, C. L (Astronomical Society of India, 2003)
    The Imaging Element (IE) of the 4-element TACTIC array of atmospheric Cherenkov telescopes is in operation at Mt. Abu Rajasthan, in Western India. We have successfully detected a steady signal from the Crab Nebula at a ...
  • Gamma ray astronomy : New Indian initiatives 
    Bhat, C. L (Astronomical Society of India, 2000)
    In this brief review, major new initiatives presently under implementation in India in the field of gamma-ray astronomy are discussed in the backdrop of the just-concluded exploratory phase in the field.
  • Gamma ray bursts at high energies : detection ranges and event rates 
    Shanthi, K; Kaul, C. L; Kaul, R. K; Tickoo, A. K; Bhat, C. L (Astronomical Society of India, 2002)
    The Gamma-Ray Burst (GRB) detection rates at energies ? 20GeV, have been estimated for the 3 atmospheric Cerenkov telescope systems of the GRACE project at Mt. Abu, under the assumption that the bursts have a cosmological ...
  • Gamma ray observations of polars 
    Bhat, C. L (Astronomical Society of India, 1990)
    Experimental evidence is reported for the discovery of an entirely new class of gamma-ray binary objects involving a magnetic white dwarf rather than a neutron star degenerate primary. These sources may have photon energies ...
  • Gamma ray production in SNR's -contribution from photomeson process 
    Bhattacharya, S; Kaul, R. K; Kaul, C. L; Bhat, C. L (Astronomical Society of India, 1999)
    We estimate the integral γ-ray fluxes above 10 MeV photon energy, likely to result from neutral pion decay, following photomeson interactions between ultra-high energy protons accelerated in Supernova Remnants (SNR) and ...
  • Gamma-ray astronomy activities in BARC - Past contributions and present challenges 
    Razdan, H; Bhat, C. L (Astronomical Society of India, 1997)
    It was in the early seventies that we made a modest start in the Nuclear Research Laboratory (NRL) of the Bhabha Atomic Research Centre (BARC) in the then-budding field of observational gamma-ray astronomy by setting up ...
  • Ground-based - γ ray astronomy : Present status and future prospects 
    Bhat, C. L (Astronomical Society of India, 1997)
    In this article, we review the observational scene in ground based γ-ray astronomy as it has changed from a rather ambiguous exploratory-phase in the eighties to a more unequivocal consolidation–phase in the recent times. ...
  • Ground-based detection of cosmic gamma-ray bursts through atmospheric scintillation technique - A feasibility study 
    Bhat, C. L; Tickoo, A. K; Koul, R; Dhar, V. K; Shanthi, K (Astronomical Society of India, 1999)
    A ground-based experiment is proposed for detecting cosmic gamma-ray bursts. The underlying detection strategy and some salient features of the instrument are discussed in this paper.
  • Hint of a galactic origin for a sub-population of extremely short and hard cosmic gamma-ray bursts 
    Shanthi, K; Rao, A. R; Bhat, C. L; Vahia, M. N (Astronomical Society of India, 1999)
    Gamma Ray Bursts (GRBs) belong to an exotic class of astronomical phenomena whose origin and nature continues to puzzle the astrophysical community. These enigmatic events are seen as intense outbursts of high-energy photon ...
  • Large-Area Wide Angle (LAWA) cerenkov detector for MYSTIQUE array 
    Kamath, K; Bhattacharyya, S; Dhar, V. K; Darzi, M. A; Kaul, S. R; Kaul, R. K; Koul, R; Sahayanathan, S; Tickoo, A. K; Wani, A. M; Bhat, C. L (Astronomical Society of India, 2002)
    An ultra-sensitive, multidetector wide angle atmospheric Cerenkov telescope array is being set up at Mt. Abu for cosnic gamma-ray studies in tens of TeV energy region. The design features of the Cerenkov light detector, ...
  • Mechanical design and deflection analysis of TACTIC gamma-ray telescope 
    Ramesh Kumar; Suthar, R. L; Murthy, G. S. K; Koul, R; Bhat, C. L; Karkera, B. N (Astronomical Society of India, 1993)
    The high sensitivity gamma-ray telescope TACTIC to be set up at Gurushikar is presently being manufactured at the Central Workshop, Bhabha Atomic Research Centre (BARC). Deflection analysis of the mirror basket assembly, ...
  • Millisecond pulsars as VHE gamma-ray sources 
    Kaul, R. K; Kaul, C. L; Bhat, C. L (Astronomical Society of India, 1999)
    The detectability of millisecond pulsars in VHE gamma-ray bracket (>5x10 to the power 11 eV), with the recently-commissioned TACTIC array, has been investigated on the basis of system energetics and the pulsar polar gap ...
  • Mobile domes for TACTIC telescope 
    Karkera, B. N; Puri, I. K; Bhat, C. L; Koul, R; Murthy, G. S. K; Suthar, R. L; Kmble, S. H (Astronomical Society of India, 1993)
    A system of mobile domes which have a minimal shadowing effect, is proposed for the TACTIC telescope being set up at Gurushikar, Mt. Abu. The important design considerations and the salient features of the proposed concept ...
  • Novel image and non-image parameters for efficient characterisation of atmospheric Cerenkov images 
    Razdan, A; Haungs, A; Rebel, H; Bhat, C. L (Astronomical Society of India, 2002)
    We make a comparative study of the classification potential of various image and non-image parameters which are measurable with the TACTIC array focal plane instrumentation. The image parameters include conventional Hillas ...
  • Observations of Mkn 421 with TACTIC 
    Kaul, R. K; Bhat, C. L (Astronomical Society of India, 2002)
    The TACTIC imaging element has observed the extragalactic BL Lac object Mkn 421 for ~ 78h during Jan. - April 2001. Analysis of the overall data set, using the dynamic supercuts methodology, has revealed the presence of a ...
  • Optimum image parameter ranges for TACTIC imaging elements : guidance from simulations 
    Koul, M. K; Charagi, S. K; Rannot, R. C; Sapru, M. L; Bhat, C. L (Astronomical Society of India, 2002)
    In this paper, we present some results on the performance characteristics of the TACTIC Imaging Element (IE) as predicted by extensive simulation studies. The main features studied are the optimum image parameter ranges ...
  • Present status of very high energy gamma ray astronomy and plans for an imaging gamma ray telescope in India 
    Bhat, C. L (Astronomical Society of India, 1993)
    The unequivocal detection of the Crab Nebula as the first-ever standard candle in the very high energy (VHE) bracket, made possible by the recently-developed Cerenkov Imaging Technique, marks a water-shed in the 20 year-old ...
  • Recent results on crab nebula and Mkn-421 observations with TACTIC imaging element 
    Bhatt, N; Agarwal, N. K; Bhat, C. K; Bhattacharaya, S; Charagi, S. K; Chandra, P; Chauhan, N; Dhar, V. K; Goyal, A; Goyal, H. C; Kamath, K; Kaul, C. L; Kaul, I. K; Kaul, R. K; Kaul, S. K; Kaul, S. R; Sharma, M; Kothari, M; Kotwal, S. V; Koul, D. K; Koul, M. K; Rannot, R. C; Razdan, A. K; Sahaynathan, S; Sapru, M. L; Satyabhama, N; Tickoo, A. K; Venugopal, K; Yadav, K. K; Bhat, C. L (Astronomical Society of India, 2002)
    The results of our recent observational campaigns on the Crab Nebula and Mkn-421, carried out with the 349-pixel Imaging Element of the TACTIC array, are presented alongwith the details of the data analysis. Analysis of ...
  • Reclassification of gamma-ray bursts based on their brightness distributions 
    Shanthi, K; Bhat, C. L (Astronomical Society of India, 2002)
    A reclassification of the cosmic gamma-ray bursts has been done into two distinct classes on the basis of their brightness distributions. While one (majority) class is found to be compatible with a homogeneous and ...

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