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Browsing by Author "Sapru, M. L"

Browsing by Author "Sapru, M. L"

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  • 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 ...
  • 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 Studies for Optimizing the Trigger Field of View of the TACTIC Imaging Element 
    Koul, M. K; Sapru, M. L (Astronomical Society of India, 2003)
    Simulation studies, for the Imaging Camera of the TACTIC -ray telescope have been carried out to optimize its trigger field of view for a point -ray source. The results indicate that a trigger field of 9 x 9 pixels should ...
  • 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 ...
  • 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 ...

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