Search Results - "Chanchalani, K"

Very High-energy Gamma-Ray Episodic Activity of Radio Galaxy NGC 1275 in 2022–2023 Measured with MACE by Godambe, S., Mankuzhiyil, N., Borwankar, C., Ghosal, B., Tolamatti, A., Pal, M., Chandra, P., Khurana, M., Pandey, P., Dar, Z. A., Godiyal, S., Hariharan, J., Anand, Keshav, Norlha, S., Sarkar, D., Thubstan, R., Venugopal, K., Pathania, A., Kotwal, S., Kumar, Raj, Bhatt, N., Chanchalani, K., Das, M., Singh, K. K., Gour, K. K., Kothari, M., Kumar, Nandan, Kumar, Naveen, Marandi, P., Kushwaha, C. P., Koul, M. K., Dorjey, P., Dorji, N., Chitnis, V. R., Rannot, R. C., Bhattacharyya, S., Chouhan, N., Dhar, V. K., Sharma, M., Yadav, K. K.

“…Abstract The radio galaxy NGC 1275, located at the central region of Perseus cluster, is a well-known very high-energy (VHE) gamma-ray emitter. The Major…”
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Observations of the Crab Nebula with MACE (Major Atmospheric Cherenkov Experiment) by C., Borwankar, M., Sharma, J., Hariharan, K., Venugopal, S., Godambe, N., Mankuzhyil, P., Chandra, M., Khurana, A., Pathania, N., Chouhan, V.K., Dhar, R., Thubstan, S., Norlha, Keshavanand, D., Sarkar, Z.A., Dar, S.V., Kotwal, S., Godiyal, C.P., Kushwaha, K.K., Singh, M.P., Das, A., Tolamati, B., Ghosal, K., Chanchalani, P., Pandey, N., Bhatt, S., Bhattcharyya, S., Sahayanathan, M.K., Koul, P., Dorjey, N., Dorji, V.R., Chitnis, A.K., Tickoo, R.C., Rannot, K.K., Yadav

“…The Major Atmospheric Cherenkov Experiment (MACE) is a large size (21 m) Imaging Atmospheric Cherenkov Telescope (IACT) installed at an altitude of 4270 m…”
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Study of short term enhanced TeV γ- ray emission from Mrk 421 observed with TACTIC on December 28, 2014 by Singh, K K, Yadav, K K, Chanchalani, K, Chandra, P, Ghosal, B, Tickoo, A K, Rannot, R C, Marandi, P, Agarwal, N K, Kothari, M, Gour, K K, Goyal, H C, Goyal, A, Kumar, N, Borwankar, C, Kaul, S R, Dhar, V K, Koul, M K, Koul, R, Venugopal, K, Bhat, C K, Chouhan, N

“…In this work, we report on the detection of enhanced TeV γ- ray emission from the high synchrotron-peaked blazar Mrk 421 with the TACTIC telescope on the night…”
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Multiwavelength study of Fermi hard spectrum blazar B2 0806+35 using Swift, Fermi, and TACTIC observations by Bhattacharyya, S, Ghosal, B, Chandra, P, Singh, K K, Yadav, K K, Tickoo, A K, Rannot, R C, Kumar, N, Marandi, P, Agarwal, N K, Kothari, M, Gour, K K, Goyal, H C, Goyal, A, Chauhan, N, Borwankar, C, Dhar, V K, Koul, M K, Koul, R, Venugopal, K, Chanchalani, K, Bhat, C K, Sharma, M, Bhatt, N

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Search for TeV γ-ray emission from blazar 1ES1218+304 with TACTIC telescope during March–April 2013 by Singh, K.K., Yadav, K.K., Tickoo, A.K., Rannot, R.C., Chandra, P., Agarwal, N.K., Gaur, K.K., Goyal, A., Goyal, H.C., Kumar, N., Marandi, P., Kothari, M., Bhatt, H., Chanchalani, K., Chouhan, N., Dhar, V.K., Ghosal, B., Kaul, S.R., Koul, M.K., Koul, R., Venugopal, K., Bhat, C.K., Borwankar, C., Bhagwan, J., Gupta, A.C.

“…•We search for TeV gamma-ray emission from blazar 1ES 1218+304 with TACTIC telescope.•No activity in TeV energy regime is observed from the source.•We present…”
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Simulation studies for optimizing the trigger generation criteria for the TACTIC telescope by Koul, M.K., Tickoo, A.K., Dhar, V.K., Venugopal, K., Chanchalani, K., Rannot, R.C., Yadav, K.K., Chandra, P., Kothari, M., Koul, R.

“…In this paper, we present the results of Monte Carlo simulations of γ ‐ ray and cosmic-ray proton induced extensive air showers as detected by the TACTIC…”
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Long term performance evaluation of the TACTIC imaging telescope using ∼400 h Crab Nebula observation during 2003–2010 by TICKOO, A K, KOUL, R, RANNOT, R C, YADAV, K K, CHANDRA, P, DHAR, V K, KOUL, M K, KOTHARI, M, AGARWAL, N K, GOYAL, A, GOYAL, H C, KOTWAL, S, KUMAR, N, MARANDI, P, VENUGOPAL, K, CHANCHALANI, K, BHATT, N, BHATTACHARYYA, S, BORWANKAR, C, CHOUHAN, N, KAUL, S R, MITRA, A K, SAHAYNATHAN, S, SHARMA, M, SINGH, K K, BHAT, C K

“…The TeV atmospheric Cherenkov telescope with imaging camera (TACTIC) γ -ray telescope has been in operation at Mt. Abu, India since 2001 to study TeV γ -ray…”
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Observations of the Crab Nebula with MACE (Major Atmospheric Cherenkov Experiment) by C, Borwankar, M, Sharma, J, Hariharan, K, Venugopal, S, Godambe, N, Mankuzhyil, P, Chandra, M, Khurana, A, Pathania, N, Chouhan, K, Dhar V, R, Thubstan, S, Norlha, Keshavananda, D, Sarkar, A, Dar Z, V, Kotwal S, S, Godiyal, P, Kushwaha C, K, Singh K, P, Das M, A, Tolamatti, B, Ghosal, K, Chanchalani, P, Pandey, N, Bhatt, S, Bhattcharyya, S, Sahayanathan, K, Koul M, P, Dorjey, N, Dorji, R, Chitnis V, K, Tickoo A, C, Rannot R, K, Yadav K

“…Astroparticle Physics 159 (2024) 102960 The Major Atmospheric Cherenkov Experiment (MACE) is a large size (21m) Imaging Atmospheric Cherenkov Telescope (IACT)…”
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Estimation of the excess noise factor for TACTIC photomultiplier tubes using Gaussian mixture model based machine learning algorithm by Das, M.P., Dhar, V.K., Venugopal, K., Chanchalani, K., Murudkar, V., Yadav, K.K.

“…The Excess Noise Factor (ENF) of a Photomultiplier Tube (PMT) is basically the additional noise introduced because of the statistical nature of electron…”
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Multiwavelength study of the radio galaxy NGC 1275 with TACTIC, Fermi and Swift during December, 2016 – February, 2017 by Ghosal, B., Tolamatti, A., Singh, K.K., Yadav, K.K., Rannot, R.C., Tickoo, A.K., Chandra, P., Goyal, A., Kumar, N., Marandi, P., Agarwal, N.K., Kothari, M., Gaur, K.K., Chouhan, N., Borwankar, C., Dhar, V.K., Koul, M.K., Venugopal, K., Chanchalani, K., Bhat, C.K., Godiyal, S., Mankuzhiyil, N., Godambe, S., Sahayanathan, S., Sharma, M.

“…•Observation with TACTIC telescope in search for TeV gamma-rays above 0.85 TeV energy from NGC 1275.•Nearly simultaneous observation with Fermi-LAT, Swift-XRT,…”
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Multiwavelength study of the radio galaxy NGC 1275 with TACTIC, F e r m i and S w i f t during December, 2016 – February, 2017 by Ghosal, B., Tolamatti, A., Singh, K.K., Yadav, K.K., Rannot, R.C., Tickoo, A.K., Chandra, P., Goyal, A., Kumar, N., Marandi, P., Agarwal, N.K., Kothari, M., Gaur, K.K., Chouhan, N., Borwankar, C., Dhar, V.K., Koul, M.K., Venugopal, K., Chanchalani, K., Bhat, C.K., Godiyal, S., Mankuzhiyil, N., Godambe, S., Sahayanathan, S., Sharma, M.

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A time dependent approach to model X-ray and γ–ray light curves of Mrk 421 observed during the flare in February 2010 by Singh, K.K., Sahayanathan, S., Sinha, A., Bhatt, N., Tickoo, A.K., Yadav, K.K., Rannot, R.C., Chandra, P., Venugopal, K., Marandi, P., Kumar, N., Goyal, H.C., Goyal, A., Agarwal, N.K., Kothari, M., Chanchalani, K., Dhar, V.K., Chouhan, N., Bhat, C.K., Koul, M.K., Koul, R.

“…•Time dependent single zone SSC model is used to reproduce the broad band emission.•Temporal analysis of light curves indicates asymmetric flare with fast rise…”
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VHE observation of Mrk 421 with TACTIC during 2012; multiwavelength study by Ghosal, B., Yadav, K.K., Singh, K.K., Rannot, R.C., Tickoo, A.K., Chandra, P., Bhatt, H., Gaur, K.K., Goyal, A., Goyal, H.C., Kumar, N., Marandi, P., Kothari, M., Sahayanathan, S., Chanchalani, K., Agarwal, N.K., Dhar, V.K., Kaul, S.R., Koul, M.K., Koul, R., Venugopal, K., Bhat, C.K., Borwankar, C., Chouhan, N.

“…The nearby (z=0.031) TeV γ-ray emitter BL Lac object Mrk 421 has been observed with the TACTIC telescope for nearly 118 hours during 01 February to 26 April,…”
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Multiwavelength study of VHE emission from Markarian 501 using TACTIC observations during April–May, 2012 by Chandra, P., Singh, K.K., Rannot, R.C., Yadav, K.K., Bhatt, H., Tickoo, A.K., Ghosal, B., Kothari, M., Gaur, K.K., Goyal, A., Goyal, H.C., Kumar, N., Marandi, P., Chouhan, N., Sahayanathan, S., Chanchalani, K., Agarwal, N.K., Dhar, V.K., Kaul, S.R., Koul, M.K., Koul, R., Venugopal, K., Bhat, C.K., Borwankar, C., Bhagwan, J., Gupta, A.C.

“…•We search for TeV gamma-ray emission from blazar Mrk 501 using TACTIC telescope.•The source was found in relatively high state during 22–27 May,…”
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TeV γ-ray emission from Mrk 421 observed with TACTIC during December 2014–February 2015 by Yadav, K.K., Chanchalani, K., Singh, K.K., Ghosal, B., Chandra, P., Rannot, R.C., Tickoo, A.K., Agarwal, N.K., Kothari, M., Gaur, K.K., Goyal, H.C., Goyal, A., Kumar, N., Marandi, P., Kaul, S.R., Dhar, V.K., Koul, M.K., Koul, R., Venugopal, K., Bhat, C.K., Chouhan, N., Borwankar, C.

“…•VHE gamma-ray observations of Mrk 421 with TACTIC during 2014-15.•Near simultaneous multi-wavelength data used to complement the TACTIC…”
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Search for very high energy gamma-ray emission from the peculiar radio galaxy IC 310 with TACTIC during 2012 to 2015 by Ghosal, B., Singh, K.K., Yadav, K.K., Tickoo, A.K., Rannot, R.C., Chandra, P., Kothari, M., Gaur, K.K., Goyal, H.C., Goyal, A., Kumar, N., Marandi, P., Chanchalani, K., Agarwal, N.K., Dhar, V.K., Koul, M.K., Koul, R., Venugopal, K., Bhat, C.K., Chouhan, N., Borwankar, C., Kaul, S.R., Bhatt, H., Agarwal, A., Gupta, A.C.

“…•Long term observation (three years) with TACTIC telescope in search for TeV gamma-rays from IC 310.•Nearly simultaneous observation with Fermi-LAT and from…”
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Artificial Neural Network based γ-hadron segregation methodology for TACTIC telescope by Dhar, V.K., Tickoo, A.K., Koul, M.K., Koul, R., Dubey, B.P., Rannot, R.C., Yadav, K.K., Chandra, P., Kothari, M., Chanchalani, K., Venugopal, K.

“…The sensitivity of a Cherenkov imaging telescope is strongly dependent on the rejection of the cosmic-ray background events. The methods which have been used…”
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Artificial Neural Network based gamma -hadron gamma -hadron segregation methodology for TACTIC telescope by Dhar, V K, Tickoo, A K, Koul, M K, Koul, R, Dubey, B P, Rannot, R C, Yadav, K K, Chandra, P, Kothari, M, Chanchalani, K, Venugopal, K

“…The sensitivity of a Cherenkov imaging telescope is strongly dependent on the rejection of the cosmic-ray background events. The methods which have been used…”
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Artificial Neural Network based segregation methodology for TACTIC telescope by Dhar, V.K., Tickoo, A.K., Koul, M.K., Koul, R., Dubey, B.P., Rannot, R.C., Yadav, K.K., Chandra, P., Kothari, M., Chanchalani, K., Venugopal, K.

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RT-15 IMPACT OF CHANGING TRENDS OF TREATMENT ON OUTCOME OF GLIOSARCOMA: A TERTIARY CARE CENTER EXPERIENCE by Kumar, N., Bhattacharyya, T., Chanchalani, K., Kumar, R., Shalunke, P., Radotra, B. D., Yadav, B. S., Ghoshal, S.

“…AIM: To assess the clinicopathological features and outcome in patients of primary gliosarcoma with changing trends of treatment. MATERIALS AND METHODS:…”
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