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Browsing by Author "Anupama, G. C"

Browsing by Author "Anupama, G. C"

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  • Studies of Classical and Recurrent Novae 
    Anupama, G. C (Indian Institute of Astrophysics, Bangalore, 1990-11)
  • A study of the local environment of novae in the Large Magellanic Cloud 
    Subramaniam, A; Anupama, G. C (Astronomical Society of India, 2001)
  • A study of the performance parameters of the High Altitude Gamma Ray (HAGAR) telescope system at Ladakh in India 
    Saha, L; Chitnis, V. R; Vishwanath, P. R; Kale, S; Shukla, A; Acharya, B. S; Anupama, G. C; Bhattacharjee, P; Britto, R. J; Prabhu, T. P; Singh, B. B (Elsevier Science B.V., 2013-02)
    We present results of Monte Carlo simulations for the High Altitude Gamma Ray (HAGAR) telescope array which detects very high energy gamma rays from astronomical sources. This telescope array, located at Hanle at an altitude ...
  • Supernova 1991T in NGC 4527 
    Sivaraman, K. R; Prabhu, T. P; Anupama, G. C; Schmeer, P; Smith, H; Royer, R; Lubcke, G; Villi, M; Cortini, G (Smithsonian Astrophysical Observatory, 1991-04)
  • Supernova SN 2012dn: a spectroscopic clone of SN 2006gz 
    Chakradhari, N. K; Sahu, D. K; Srivastav, S; Anupama, G. C (Oxford University Press on behalf of the Royal Astronomical Society, 2014-09-11)
    We present optical and UV analysis of the luminous Type Ia supernova SN 2012dn covering the period from ∼−11 to +109 d with respect to the B-band maximum, which occurred on JD 245 6132.89 ± 0.19, with an apparent magnitude ...
  • A tale of two GRB-SNe at a common redshift of z=0.54 
    Cano, Z; Bersier, D; Guidorzi, C; Margutti, R; Svensson, K. M; Kobayashi, S; Melandri, A; Wiersema, K; Pozanenko, A; van der Horst, A. J; Pooley, G. G; Fernandez-Soto, A; Castro-Tirado, A. J; de Ugarte Postigo, A; Im, M; Kamble, A. P; Sahu, D. K; Alonso-Lorite, J; Anupama, G. C; Bibby, J. L; Burgdorf, M. J; Clay, N; Curran, P. A; Fatkhullin, T. A; Fruchter, A. S; Garnavich, P; Gomboc, A; Gorosabel, J; Graham, J. F; Gurugubelli, U. K; Haislip, J; Huang, K; Huxor, A; Ibrahimov, M; Jeon, Y; Jeon, Y. B; Ivarsen, K; Kasen, D; Klunko, E; Kouveliotou, C; LaCluyze, A; Levan, A. J; Loznikov, V; Mazzali, P. A; Moskvitin, A. S; Mottram, C; Mundell, C. G; Nugent, P. E; Nysewander, M; O’Brien, P. T; Park, W. K; Peris, V; Pian, E; Reichart, D; Rhoads, J. E; Rol, E; Rumyantsev, V; Scowcroft, V; Shakhovskoy, D; Small, E; Smith, R. J; Sokolov, V. V; Starling, R. L. C; Steele, I; Strom, R. G; Tanvir, N. R; Tsapras, Y; Urata, Y; Vaduvescu, O; Volnova, A; Volvach, A; Wijers, R. A. M. J; Woosley, S. E; Young, D. R (Wiley-Blackwell, 2011-05)
    We present ground-based and Hubble Space Telescope optical observations of the optical transients (OTs) of long-duration Gamma Ray Bursts (GRBs) 060729 and 090618, both at a redshift of z= 0.54. For GRB 060729, bumps are ...
  • TIRSPEC: TIFR Near Infrared Spectrometer and Imager 
    Ninan, J. P; Ojha, D. K; Ghosh, S. K; D'Costa, S. L. A; Naik, M. B; Poojary, S. S; Sandimani, P. R; Meshram, G. S; Jadhav, R. B; Bhagat, S. B; Gharat, S. M; Bakalkar, C. B; Prabhu, T. P; Anupama, G. C; Toomey, D. W (World Scientific Publishing Co., 2014-12)
    We describe the TIFR Near Infrared Spectrometer and Imager (TIRSPEC) designed and built in collaboration with M/s. Mauna Kea Infrared LLC, Hawaii, USA, now in operation on the side port of the 2-m Himalayan Chandra Telescope ...
  • Towards new analysis of Gamma-Ray sources at HImalayan Gamma-Ray Observatory (HIGRO) in northern India 
    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; 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 (French Society of Astronomy and Astrophysics, 2010-12)
    The High Altitude GAmma-Ray (HAGAR) array is a wavefront sampling array of 7 telescopes, set-up at Hanle, at 4270 m a.s.l., in the Ladakh region of the Himalayas (North India). It constitutes the first phase of the HImalayan ...
  • Towards the development of the Infrared Guide Star Catalogue for the adaptive optics observations by the Thirty Meter Telescope 
    Shah, Sarang; Subramanian, S; Anupama, G. C; Delgado, Francisco; Gillies, Kim; Maheswar, G; Narayanan, Rajalakshmi; Ramaprakash, A. N; Rao, Suhasini; Reddy, B. E; Skidmore, Warren; Sivarani, T; Subramaniam, A (SPIE-The International Society for Optical Engineering, 2022-08)
    At first light, the NIR instruments of TMT will be assisted by a multi-conjugate adaptive optics instrument, known as the Narrow Field Infrared Adaptive Optics System (NFIRAOS). NFIRAOS will use laser guide stars for ...
  • Type Ia supernova SN 2003du: Optical observations 
    Anupama, G. C; Sahu, D. K; Jose, J (EDP Sciences, 2005-01)
    UBVRI photometry and optical spectra of type Ia supernova SN 2003du obtained at the Indian Astronomical Observatory for nearly a year since discovery are presented. The apparent magnitude at maximum was $B=13.53\pm ...
  • Type Ia supernovae SN 2013bz, PSN J0910 + 5003, and ASASSN-16ex: similar to 09dc-like? 
    Tiwari, S; Chakradhari, N. K; Sahu, D. K; Anupama, G. C; Kumar, B; Sahu, K. R (Oxford University Press on behalf of Royal Astronomical Society, 2023-06)
    We present optical photometric and spectroscopic studies of three supernovae (SNe): SN 2013bz, PSN J0910 + 5003, and ASASSN-16ex (SN 2016ccj). UV–optical photometric data of ASASSN-16ex obtained with the Swift ...
  • Type Ia Supernovae: Progenitors and Peculiarity 
    Nomoto, K; Tanaka, M; Kawabata, K. S; Sahu, D. K; Anupama, G. C (American Institute of Physics, 2007-08)
    Among the controversial issues on Type Ia supernovae (SNe Ia), we discuss (1) the evolutionary paths of the progenitor systems to SNe Ia, especially, the thermal stability of hydrogen shell burning in accreting white dwarfs, ...
  • Type Ib supernova 2008d associated with the luminous x-ray transient 080109: an energetic explosion of a massive helium star 
    Tanaka, M; Tominaga, N; Nomoto, K; Valenti, S; Sahu, D. K; Minezaki, T; Yoshii, Y; Yoshida, M; Anupama, G. C; Benetti, S; Chincarini, G; Valle, M. D; Mazzali, P. A; Pian, E (The American Astronomical Society, 2009-02)
    We present a theoretical model for supernova SN 2008D associated with the luminous X-ray transient 080109. The bolometric light curve and optical spectra of the SN are modeled based on the progenitor models and the explosion ...
  • The Unique Type Ib Supernova 2005bf: A WN Star Explosion Model for Peculiar Light Curves and Spectra 
    Tominaga, N; Tanaka, M; Nomoto, K; Mazzali, P. A; Deng, J; Maeda, K; Umeda, H; Modjaz, M; Hicken, M; Challis, P; Kirshner, R. P; Wood-Vasey, W. M; Blake, C. H; Bloom, J. S; Skrutskie, M. F; Szentgyorgyi, A; Falco, E. E; Inada, N; Minezaki, T; Yoshii, Y; Kawabata, K; Iye, M; Anupama, G. C; Sahu, D. K; Prabhu, T. P (The American Astronomical Society, 2005-11-10)
    Observations and modeling for the light curve (LC) and spectra of supernova (SN) 2005bf are reported. This SN showed unique features: the LC had two maxima, and declined rapidly after the second maximum, while the spectra ...
  • Unusual optical quiescence of the classical BL Lac object PKS 0735+178 on intranight time scale 
    Goyal, A; Gopal-Krishna; Anupama, G. C; Sahu, D. K; Sagar, R; Britzen, S; Karouzos, M; Aller, M. F; Aller, H. D (Wiley Blackwell, 2009-07)
    We present the result of our extensive intranight optical monitoring of the well known low-energy peaked BL Lac (LBL) object PKS 0735+178. This long-term follow-up consists of $R$-band monitoring for a minimum duration of ...
  • V2676 Oph: Estimating Physical Parameters of a Moderately Fast Nova 
    Raj, A; Pavana, M; Kamath, U. S; Anupama, G. C; Walter, F. M (Copernicus Foundation for Polish Astronomy, 2018-03)
    Using our previously reported observations, we derive some physical parameters of the moderately fast nova V2676 Oph 2012 #1. The best-fit CLOUDY model of the nebular spectrum obtained on 2015 May 8 shows a hot white dwarf ...
  • V899 Mon: an outbursting protostar with a peculiar light curve, and its transition phases 
    Ninan, J. P; Ojha, D. K; Baug, T; Bhatt, B. C; Mohan, V; Ghosh, S. K; Menshchikov, A; Anupama, G. C; Tamura, M; Henning, Th (IOP Publishing, 2015-12-10)
    We present a detailed study of V899 Mon (a new member in the FUors/EXors family of young low-mass stars undergoing outburst), based on our long-term monitoring of the source starting from 2009 November to 2015 April. Our ...
  • Validation of estimated cloud fraction from MERRA-2 and AIRS data using ground based observation over IAO, Hanle 
    Shantikumar, S. N; Narendra, A; Bhatt, B. C; Prabhu, T. P; Anupama, G. C; Angchuk, D; Jorphail, S (Elsevier B.V, 2020-08-15)
    We report for validation of cloud fraction estimated from high-resolution (hourly) data from MERRA-2 and AIRS instrument aboard NASA’s Aqua satellite during its ascending and descending orbits with hourly ground-based ...
  • A very luminous jet from the disruption of a star by a massive black hole 
    Andreoni, Igor; Coughlin, Michael W; Perley, Daniel A; Yao, Yuhan; Lu, Wenbin; Bradley Cenko, S; Kumar, Harsh; Anand, Shreya; Ho, Anna Y. Q; Kasliwal, Mansi M; de Ugarte Postigo, Antonio; Sagues-Carracedo, Ana; Schulze, Steve; Alexander Kann, D; Kulkarni, S. R; Sollerman, Jesper; Tanvir, Nial; Rest, Armin; Izzo, Luca; Somalwar, Jean J; Kaplan, David L; Ahumada, Tomas; Anupama, G. C; Auchettl, Katie; Barway, Sudhanshu; Bellm, Eric C; Bhalerao, Varun; Bloom, Joshua S; Bremer, Michael; Bulla, Mattia; Burns, Eric; Campana, Sergio; Chandra, Poonam; Charalampopoulos, Panos; Cooke, Jeff; D’Elia, Valerio; Das, Kaustav Kashyap; Dobie, Dougal; Fernandez, Jose Feliciano Agui; Freeburn, James; Fremling, Cristoffer; Gezari, Suvi; Goode, Simon; Graham, Matthew J; Hammerstein, Erica; Karambelkar, Viraj R; Kilpatrick, Charles D; Kool, Erik C; Krips, Melanie; Laher, Russ R; Leloudas, Giorgos; Levan, Andrew; Lundquist, Michael J; Mahabal, Ashish A; Medford, Michael S; Coleman Miller, M; Moller, Anais; Mooley, Kunal P; Nayana, A. J; Nir, Guy; Pang, Peter T. H; Paraskeva, Emmy; Perley, Richard A; Petitpas, Glen; Pursiainen, Miika; Ravi, Vikram; Ridden-Harper, Ryan; Riddle, Reed; Rigault, Mickael; Rodriguez, Antonio C; Rusholme, Ben; Sharma, Yashvi; Smith, I. A; Stein, Robert D; Thone, Christina; Tohuvavohu, Aaron; Valdes, Frank; van Roestel, Jan; Vergani, Susanna D; Wang, Qinan; Zhang, Jielai (Springer Nature, 2022-12-15)
    Tidal disruption events (TDEs) are bursts of electromagnetic energy that are released when supermassive black holes at the centres of galaxies violently disrupt a star that passes too close1. TDEs provide a window through ...
  • VHE gamma-ray observation of Crab Nebula with HAGAR telescope array 
    Singh, B. B; Britto, R. J; Chitnis, V. R; Shukla, A; Saha, L; Sinha, A; Acharya, B. S; Vishwanath, P. R; Anupama, G. C; Bhattacharjee, P; Gothe, K .S; Nagesh, B. K; Prabhu, T. P; Rao, S. K; Srinivasan, R; Upadhya, S. S (Springer, 2019-12)
    HAGAR is a system of seven Non-imaging Atmospheric Cherenkov Telescopes located at Hanle in the Ladakh region of the Indian Himalay as at an altitude of 4270 meters amsl . Since 2008, we have observed the Crab Nebula to ...

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