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Browsing by Author "Tickoo, A. K"

Browsing by Author "Tickoo, A. K"

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  • Artificial Neural Network-based Image-cleaning Method for Atmospheric Cerenkov Imaging Telescopes 
    Dhar, V. K; Tickoo, A. K; Kaul, M. K; Kaul, C. L; Rannot, R. C; Yadav, K. K; Dubey, B. P; Koul, R (Astronomical Society of India, 2003)
    A novel image-cleaning method, based on the utilization of Artificial Neural Network (ANN) is shown here to `correctly' select more pixels in a Cerenkov image than in the conventional approach.
  • Design philosophy of TACTIC -- a high sensitivity VHE gamma-ray telescope 
    Bhat, C. L; Razdan, H; Koul, R; Sapru, M. L; Tickoo, A. K; Rannot, R. C; Kaul, R. K; Kaul, C. L (Astronomical Society of India, 1993)
    TACTIC is a high-sensitivity gound-based very high energy (VHE) telescope designed for undertaking comprehensive temporal and spectral studies of galactic and extragalactic gamma-ray sources. Its main design specifications, ...
  • Detector instrumentation and drive system for TACTIC gamma-ray telescope 
    Koul, R; Bhat, C. L; Tickoo, A. K; Kaul, I. K; Kaul, S. K; Kaul, S. R; Sapru, M. L; Rannot, R. C (Astronomical Society of India, 1993)
    TACTIC, a high sensitivity gamma-ray telescope is being set up at Gurushikar, Mt. Abu, to undertake comprehensive temporal and spectral studies of cosmic gamma-ray sources in the TeV energy range. The salient features of ...
  • Drive control system for the TACTIC γ-ray telescope 
    Tickoo, A. K; Koul, R; Kaul, S. K; Kaul, I. K; Bhat, C. L; Bhatt, N (Astronomical Society of India, 1999)
    We present here some salient features of the hardware and software aspects of the 2-axes drive system developed for the TACTIC γ-ray telescope array. A test-report of its performance is also presented
  • A DSO-based system for temporal-profile extraction of atmospheric Cerenkov events 
    Tickoo, A. K; Kaul, S. K; Kaul, I. K; Koul, R; Bhat, C. L (Astronomical Society of India, 2000)
    The TACTIC array of Cerenkov telescopes, being set up at Mt. Abu, proposes to record time-profiles of atmospheric Cerenkov pulses with a view to exploit apparent differences in the associated time-parameters for a possible ...
  • 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 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 ...
  • 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.
  • 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, ...
  • Observations with the High Altitude GAmma Ray (HAGAR) telescope array in the Indian Himalayas 
    Britto, R. J; Acharya, B. S; Anupama, G. C; Bhatt, N; Bhattacharjee, P; Bhattacharya, S. S; Chitnis, V. R; Cowsik, R; Dorji, N; Duhan, S. K; Gothe, K. S; Kamath, P. U; Koul, R; Mahesh, P. K; Mitra, A; Nagesh, B. K; Parmar, N. K; Prabhu, T. P; Rannot, R. C; Rao, S. K; Saha, L; Saleem, F; Saxena, A. K; Sharma, S. K; Shukla, A; Singh, B. B; Srinivasan, R; Srinivasulu, G; Sudersanan, P. V; Tickoo, A. K; Tsewang, D; Upadhya, S; Vishwanath, P. R; Yadav, K. K (French Society of Astronomy and Astrophysics, 2010-12)
    For several decades, it was thought that astrophysical sources emit high energy photons within the energy range of the gamma-ray region of the lectromagnetic spectrum also. These photons originate from interactions of high ...
  • Observations with the High Altitude GAmma-Ray (HAGAR) telescope array in the Indian Himalayas 
    Britto, R. J; Acharya, B. S; Anupama, G. C; Bhatt, N; Bhattacharjee, P; Bhattacharya, S; Chitnis, V. R; Cowsik, R; Dorji, N; Duhan, S. K; Gothe, K. S; Kamath, P. U; Koul, R; Manoharan, J; Mahesh, P. K; Mitra, A; Nagesh, B. K; Parmar, N. K; Prabhu, T. P; Rannot, R. C; Rao, S. K; Saha, L; Saleem, F; Saxena, A. K; Sharma, S. K; Shukla, A; Singh, B. B; Srinivasan, R; Srinivasulu, G; Sudersanan, P. V; Tickoo, A. K; Tsewang, D; Upadhya, S. S; Vishwanath, P. R; Yadav, K. K (Copernicus Publications, 2011-11)
    The High Altitude GAmma-Ray (HAGAR) array is a wavefront sampling array of 7 telescopes, set-up at Hanle, at 4270 m amsl, in the Ladakh region of the Himalayas (Northern India). It constitutes the first phase of the HImalayan ...
  • Recent observations of lES2344+514 and PSR 0355+54 with TACTIC Imaging Element 
    Tickoo, A. K; Dhar, V. K; Yadav, K. K; Rannot, R. C; 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; Bhatt, N; Bhatt, C. L (Astronomical Society of India, 2002-09)
    The TACTIC Imaging Element has observed the active galaxy 1ES 2344+514 and the pulsar PSR 0355+54 during Oct-Nov, 2001. Analysis of the recorded events, collected for a period of 70 hours on both these sources reveals ...
  • 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 ...
  • 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 ...
  • 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 ...

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