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Browsing by Author "Anupama, G. C"

Browsing by Author "Anupama, G. C"

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  • Further evidence for intra-night optical variability of radio-quiet quasars 
    Goyal, Arti; Gopal-Krishna; Sagar, R; Anupama, G. C; Sahu, D. K (Astronomical Society of India, 2007-06)
    Although well established for BL Lac objects and radio-loud quasars, the occurrence of intra-night optical variability (INOV) in radio-quiet quasars is still debated, primarily since only a handful of INOV events with good ...
  • Further spectroscopic observations of SN 1987A 
    Anupama, G. C; Prabhu, T. P; Ghosh, K. K; Ashoka, B. N; Giridhar, S (Elsevier, 1988)
    Spectroscopic observations of SN 1987a obtained during 1987 August 30 – September 8 from Vainu Bappu Observatory, Kavalur, are presented; the spectrum is compared and contrasted with the spectra recorded at earlier epochs. ...
  • Gain calibration of CCD systems at VBO 
    Prabhu, T. P; Mayya, Y. D; Anupama, G. C (Indian Academy of Sciences, 1992-03)
    The system gain of two CCD systems in regular use at the Vainu Bappu Observatory, Kavalur, is determined at a few gain settings. The procedure used for the determination of system gain and base-level noise is described in ...
  • The general trends of recurrent novae 
    Anupama, G. C (Kluwer Academic Publishers, 1995)
    The observational properties of recurrent novae are reviewed in this talk. The class of recurrent novea may be divided into subgroups as (a) systems with a dwarf secondary and (b) systems with a giant secondary. The primary ...
  • Generation of a Near Infra-Red Guide Star Catalog for Thirty-Meter Telescope Observations 
    Subramanian, S; Subramaniam, A; Simard, L; Gillies, K; Ramaprakash, A. N; Anupama, G. C; Stalin, C. S; Ravindranath, S; Reddy, B. E (Indian Academy of Sciences, 2013-06)
    The requirements for the production of a near Infra-Red Guide Star Catalog (IRGSC) for Thirty Meter Telescope (TMT) observations are identified and presented. A methodology to compute the expected J band magnitude of stellar ...
  • Geometry of nova ejecta 
    Pavana, M; Anupama, G. C; Ramya, M. Anche; Kamath, U. S; Selva Kumar, G (Cambridge University Press, 2020)
    We present photo-ionization and morpho-kinematic analyses of the ejecta of novae. The sample consists of ten novae belonging to the Fe II, He/N and hybrid classes. The Fe II class of novae in the sample have bipolar cone-like ...
  • GMRT Observations of the 2006 outburst of the Nova RS Ophiuchi: First detection of emission at radio frequencies < 1.4 GHz 
    Kantharia, N. G; Anupama, G. C; Prabhu, T. P; Ramya, S; Bode, M. F; Eyres, S. P. S; O'Brien, T. J (University of Chicago Press, 2007-10)
    The first low radio frequency (<1.4 GHz) detection of the outburst of the recurrent nova RS Ophiuchi is presented in this Letter. Radio emission was detected at 0.61 GHz on day 20 with a flux density of 48 mJy and at 0.325 ...
  • GRB 021004: Optical Observations 
    Sahu, D. K; Bhatt, B. C; Anupama, G. C; Prabhu, T. P (NASA, 2002)
  • GRB 050502b, Optical observations 
    Bhatt, B. C; Ramya, S; Anupama, G. C (NASA, 2005)
  • GRB 051028: an intrinsically faint gamma-ray burst at high redshift? 
    Castro-Tirado, A. J; Jelínek, M; Pandey, S. B; McBreen, S; de Jong, J; Sahu, D. K; Ferrero, P; Caballero, J. A; Gorosabel, J; Kann, D. A; Klose, S; de Ugarte Postigo, A; Anupama, G. C; Gry, C; Guziy, S; Srividya, S; Valdivielso, L; Vanniarajan, S; Henden, A. A (EDP Sciences, 2006-12)
    We present multiwavelength observations of the gamma-ray burst GRB 051028 detected by HETE-2 in order to derive its afterglow emission parameters and to determine the reason for its optical faintness when compared to other ...
  • GROWTH on S190425z: Searching Thousands of Square Degrees to Identify an Optical or Infrared Counterpart to a Binary Neutron Star Merger with the Zwicky Transient Facility and Palomar Gattini-IR 
    Coughlin, Michael W; Tomás Ahumada; Shreya Anand; Kishalay De; Hankins, Matthew J; Kasliwa, Mansi M; Singer, Leo P; Eric C. Bellm; Igor Andreoni; Bradley Cenko, S; Jeff Cooke; Copperwheat, Christopher M; Dugas, Alison M; Jencson, Jacob E; Perley, Daniel A; Po-Chieh Yu; Varun Bhalerao; Harsh Kumar; Bloom, Joshua S; Anupama, G. C; Ashley, Michael C. B; Ashot Bagdasaryan; Rahul Biswas; Buckley, David A. H; Burdge, Kevin B; Cook, David O; John Cromer; Virginia Cunningham; Antonino D ’ Aì; Dekany, Richard G; Alexandre Delacroix; Simone Dichiara; Duev, Dmitry A; Anirban Dutta; Michael Feeney; Sara Frederick; Pradip Gatkine; Shaon Ghosh; Goldstein, Daniel A; Zach Golkhou, V; Ariel Goobar; Graham, Matthew J; Hidekazu Hanayama; Takashi Horiuchi; Tiara Hung; Jha, Saurabh W; Kulkarni, Shrinivas R; Thomas Kupfer; Masci, Frank J; Paolo Mazzali; Moore, Anna M; Moses Mogotsi; Neill, James D; Chow-Choong Ngeow; Jorge Martínez-Palomera; Valentina La Parola; Pavana, M; Ofek, Eran O; Atharva Sunil Patil; Reed Riddle; Mickael Rigault; Ben Rusholme; Eugene Serabyn; Shupe, David L; Yashvi Sharma; Avinash Singh; Jesper Sollerman; Jamie Soon; Kai Staats; Kirsty Taggart; Hanjie Tan; Tony Travouillon; Eleonora Troja; Gaurav Waratkar; Yoichi Yatsu (IOP Publishing, 2019-11)
    The third observing run by LVC has brought the discovery of many compact binary coalescences. Following the detection of the fi rst binary neutron star merger in this run ( LIGO / Virgo S190425z ) , we performed ...
  • GROWTH on S190426c II: GROWTH-India Telescope search for an optical counterpart with a custom image reduction and candidate vetting pipeline 
    Kumar, Harsh; Bhalerao, Varun; Anupama, G. C; Barway, Sudhanshu; Coughlin, Michael W; De, Kishalay; Deshmukh, Kunal; Dutta, Anirban; Goldstein, Daniel A; Jassani, Adeem; Joharle, Simran; Karambelker, Viraj; Khandagale, Maitreya; Kumar, B; Saraogi, Divita; Sharma, Yashvi; Shenoy, Vedant; Singer, Leo; Singh, A; Waratkar, Gaurav (Oxford University Press on behalf of Royal Astronomical Society, 2022-11)
    S190426c/GW190426 152155 was the first probable neutron star–black hole merger candidate detected by the LIGO-Virgo Collaboration. We undertook a tiled search for optical counterparts of this event using the 0.7-m ...
  • GROWTH-India Observations of Solar System Objects 
    Sharma, Kritti; Kumar, Harsh; Bolin, Bryce; Bhalerao, Varun; Anupama, G. C; Barway, Sudhanshu (Europlanet Science Congress, 2021-09)
    The discovery, characterisation, and monitoring of Near-Earth Objects (NEOs) are critical for understanding and potentially mitigating the long-term threats to our civilisation from Potential Hazardous Asteroids (PHAs). ...
  • An H I shell-like structure associated with nova V458 Vulpeculae? 
    Nirupam Roy; Kantharia, N. G; Eyres, S. P. S; Anupama, G. C; Bode, M. F; Prabhu, T. P; O'Brien, T. J (Wiley-Blackwell, 2012-11)
    We report the radio detection of a shell-like H i structure in proximity to, and probably associated with, the nova V458 Vul. High spectral resolution observation with the Giant Metrewave Radio Telescope has made it possible ...
  • H(alpha) Imaging of the Hickson Compact Group 62 
    Valluri, M; Anupama, G. C (American Astronomical Society, 1996-10)
    We report results of a search for optical emission line gas in the Hickson compact group 62. From narrow band (Hα) imaging observations we estimate 10^4^ M_sun_ of ionized hydrogen gas within the central regions of three ...
  • H-alpha variability in the quiescent spectrum of the recurrent nova T Coronae Borealis 
    Anupama, G. C; Prabhu, T. P (Blackwell Publishing, 1991-12)
    The emission lines in the quiescent spectrum of the recurrent nova T Coronae Borealis are variable. Optical spectra recorded during the years 1985-90 show one full cycle of high and low states. After removing the slow ...
  • Habitable Planets Eclipsing Brown Dwarfs: Strategies for Detection and Characterization 
    Belu, A. R; Selsis, F; Raymond, S. N; Palle, E; Street, R; Sahu, D. K; Braun, K. V; Bolmont, E; Figueira, P; Anupama, G. C; Ribas, Ignasi (IOP Publishing, 2013-05-10)
    Given the very close proximity of their habitable zones, brown dwarfs (BDs) represent high-value targets in the search for nearby transiting habitable planets that may be suitable for follow-up occultation spectroscopy. ...
  • Highly Reddened Type Ia Supernova SN 2004ab: Another Case of Anomalous Extinction 
    Chakradhari, N. K; Sahu, D. K; Anupama, G. C; Prabhu, T. P (Oxford University Press on behalf of the Royal Astronomical Society, 2018-02)
  • Himalayan Chandra telescope 
    Anupama, G. C; Prabhu, T. P (Indian Institute of Astrophysics, 2006-01)
  • Illuminating gravitational waves: A concordant picture of photons from a neutron star merger 
    Kasliwal, M. M; Nakar, E; Singer, L. P; Kaplan, D. L; Van Sistine, A; Lau, R. M; Fremling, C; Gottlieb, O; Jencson, J. E; Adams, S. M; Feindt, U; Hotokezaka, K; Ghosh, S; Perley, D. A; Yu, P. -C; Piran, T; Allison, J. R; Anupama, G. C; and 62 co-authors (American Association for the Advancement of Science, 2017-12)
    Merging neutron stars offer an excellent laboratory for simultaneously studying strong- field gravity and matter in extreme environments. We establish the physical association of an electromagnetic counterpart (EM170817) ...

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