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Browsing by Author "Bhat, C. L"

Browsing by Author "Bhat, C. L"

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  • 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 ...
  • Salient mechanical and optical design features of 25m-diameter light-collector of MACE imaging Gamma-Ray Telescope 
    Bandyopadhayay, K; Koul, D. K; Mishra, V. K; Koul, R; Suthar, R. L; Koul, M. K; Jayandranath, M; Bhat, C. L (Astronomical Society of India, 2000)
    A low-threshold energy, high-sensitivity gamma-ray telescope, MACE (for Major Atmospheric Cerenkov Experiment) is proposed to be built in India for explorations of gamma-ray sky in 100's keV - 10's GeV photon energy range, ...
  • Salient mechanical design features of the proposed 17 meter diameter MACE imaging gamma-ray telescope 
    Suthar, R. L; Guha, S; Bandopadhyay, K; Mishra, V. K; Koul, R; Bhat, C. L (Astronomical Society of India, 2002)
    A low-threshold energy, high-sensitivity gamma-ray telescope, MACE (for Major Atmospheric Cerenkov Experiment) is proposed to be built in India for explorations of gamma-ray sky in 100's keV - 10's GeV photon energy range, ...
  • Search for a TeV photon signal from the Crab pulsar 
    Sapru, M. L; Kaul, R. K; Bhat, C. L; Dhar, V. K; Rannot, R. C; Tickoo, A. K (Astronomical Society of India, 1996)
  • Search for pulsed Te V gamma- rays from Crab pulsar with the TACTIC Imaging gamma-ray Telescope 
    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, 2002-09)
    The TACTIC Imaging Element has observed Crab Nebula/pulsar for a total. of about 40 hours during Jan.- Mar. 2001. Preliminary results do not show any evidence of the 33 ms pulsations from the pulsar direction at an energy ...
  • A search for TeV photons from 4U0115 + 63 
    Rannot, R. C; Bhat, C. L; Senecha, V. K; Sapru, M. L; Tickoo, A. K; Kaul, R. K; Rawat, H. S (Astronomical Society of India, 1993)
    An analysis of 47 hours of data collected by the Gulmarg gamma-ray telescope during the period 1989 September 27-October 30, indicates absence of a statistically significant steady, persistent-pulsed or episodic pulsed ...
  • Sensitivity and energy resolution estimates of the TACTIC gamma-ray telescope - Inputs from simulation studies (II) 
    Koul, M. K; Rannot, R. C; Sapru, M. L; Sathyabama, N; Bhat, C. L; Tickoo, A. K; Razdan, A. K; Gandhi, V. N (Astronomical Society of India, 1999)
    The response of the recently-commissioned TACTIC imaging Cerenkov telescope to atmospheric Cerenkov pulses produced by cosmid gamma-ray and hadron-initiated extensive air-showers has been studied through Monte Carlo ...
  • Simulation and experimental studies of polarization properties of atmospheric Cerenkov pulses 
    Bhat, C. L; Rannot, R. C; Mohapatra, D. K; Gandhi, V. N; Tickoo, A. K; Kaul, R; Kaul, S. K; Kaul, S. R; Goyal, H. C; Bhatt, N (Astronomical Society of India, 1999)
    We present here preliminary results obtained form some simulation and experimental investigations on the polarization state of atmospheric Cerenkov events.
  • Site-selection studies at Gurushikar, Mt. Abu for project 'GRACE' 
    Sapru, M. L; Bhat, C. L; Kaul, M. K; Kaul, S. K; Kaul, S. R; Dhar, V. K; Kaul, R. K; Rannot, R. C; Tickoo, A. K (Astronomical Society of India, 1993)
    Holding the promise of yielding up to 1150 hrs of good-quality atmospheric Cerenkov data per calendar year, Gurushikar in Mt. Abu, Rajasthan, offers itself as a good observatory site for our proposed new gamma-ray astrophysics ...
  • Site-survey inputs for the Himalayan Infra-red/Optical Telescope (HIROT) using INSAT cloud imagery data 
    Sapru, M. L; Kaul, R. K; Bhat, C. L; Mohapatra, D. K (Astronomical Society of India, 1998-12)
  • Some representative Cerenkov light images recorded by 144-pixel SHALON gamma-ray telescope 
    Nikolsky, S. I; Sinitsyna, V. G; Acobian, A. M; Matizov, B; Vorobiov, S. P; Bhat, C. L; Tickoo, A. K; Rannot, R. C; Sapru, M. L; Razdan, H (Astronomical Society of India, 1993)
    The 144-pixel SHALON imaging telescope was deployed on the nights of 1993 January 20 and 21 to record Cerenkov images of sample cosmic-ray events coming from the direction of zenith. Here, in this preliminary work, we ...
  • A spectral-ratio based trigger generator for TACTIC vertex elements 
    Kaul, I. K; Kaul, S. R; Tickoo, A. K; Koul, R; Bhat, C. L (Astronomical Society of India, 2000)
    An unconventional hardware trigger-generator, based on an on-line estimation of the spectral-ratio of the Cerenkov radiation, has been developed for the three Vertex Elements of the TACTIC gamma-ray telescope array. The ...
  • Spot size of 17m-diameter MACE reflector in presence of surface inaccuracies 
    Koul, D. K; Koul, M. K; Tickoo, A. K; Bhat, C. L (Astronomical Society of India, 2002)
    The MACE (for Major Atmospheric Cerenkov Experiment), an imaging cerenkov telescope for gamma-ray astronomy investigations in the sub-TeV energy bracket, plans to use a 17 m-diameter high quality reflecter mounted with a ...
  • Threshold energy estimates of TACTIC array elements 
    Sapru, M. L; Satyabhama, N; Koul, M. K; Tickoo, A. K; Bhat, C. L (Astronomical Society of India, 2002)
    Using the CORSIKA-code based simulation studies, we present here results on the gamma-ray and the cosmic-ray proton trigger-thresholds for the Imaging-Element and the 3 Vertex-Elements of the TACTIC atmospheric Cerenkov ...
  • Threshold energy estimates of TACTIC gamma-ray telescope array-Inputs for simulations studies (I) 
    Sathyabama, N; Sapru, M. L; Bhat, C. L; Rannot, R. C; Razdan, A. K; Tickoo, A. K; Koul, M. K; Gandhi, V. N (Astronomical Society of India, 1999)
    Comprehensive simulation studies, using the CORSIKA air-shower code are in progress to predict and optimize the performance of the TACTIC gamma-ray telescope array. Preliminary results are presensted here on the gamma-ray ...
  • Towards absolute gain calibration of the TACTIC imaging element 
    Tickoo, A. K; Dhar, V. K; Venugopal, K; Yadav, K. K; Kaul, S. K; Koul, R; Kothari, M. K; Goyal, H. C; Chandra, P; Bhatt, N; Bhat, C. L (Astronomical Society of India, 2002)
    The imaging element of the 4-element TACTIC telescope array has been in operation at Mt. Abu since 1997, for carrying out detailed investigations of gamma-ray sources in the TeV energy range. In order to characterize the ...
  • VHE gamma-ray astronomy experiments in India - Imaging cerenkov technique 
    Bhat, C. L; Kaul, R. K (Astronomical Society of India, 2002)
    The recent advances in the field of very high energy (VHE) or TeV gamma-ray astronomy, culminating in the unambiguous detection of several galactic and extragalactic sources, owes itself largely to the successful exploitation ...

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