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Browsing by Author "Castro-Tirado, A. J."

Browsing by Author "Castro-Tirado, A. J."

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  • Early optical and millimeter observations of GRB 030226 afterglow 
    Pandey, S. B.; Sagar, R.; Anupama, G. C.; Bhattacharya, D.; Sahu, D. K.; Castro-Tirado, A. J.; Bremer, M. (2004)
    The CCD magnitudes in Johnson UBV and Cousins RI photometric passbands for the afterglow of the long duration GRB 030226 are presented. Upper limits of a few mJy to millimeter wave emission at the location of optical are ...
  • GRB 000301C with peculiar afterglow emission 
    Sagar, R.; Mohan, V.; Pandey, S. B.; Pandey, A. K.; Stalin, C. S.; Castro-Tirado, A. J. (2000)
    The CCD magnitude in Johnson V and Cousins R and I photometric passbands are determined for GRB 000301C afterglow starting ~ 1.5 day after the γ – ray burst. In fact we provide the earliest optical observations for this ...
  • GRB 000926 and its optical afterglow: Another possible evidence for non-isotropic emission 
    Sagar, R.; Pandey, S. B.; Mohan, V.; Bhattacharya, D.; Castro-Tirado, A. J. (2001)
    The CCD Johnson BV and Cousins RI photometric magnitudes are determined for 20 stars in the field of GRB 000926. They are used to calibrate the present R as well as published BVRI photometric magnitudes of the GRB 000926 ...
  • The optical afterglow of the not so dark GRB 021211 
    Pandey, S. B.; Anupama, G. C.; Sagar, R.; Bhattacharya, D.; Castro-Tirado, A. J.; Sahu, D. K.; Parihar, P.; Prabhu, T. P. (2003)
    We determine Johnson B,V and Cousins R, I photometric CCD magnitudes for the afterglow of GRB 021211 during the first night after the GRB trigger. The afterglow was very faint and would have been probably missed if no ...
  • Optical and radio observations of the bright GRB 010222 afterglow: evidence for rapid synchrotron cooling 
    Sagar, R.; Stalin, C. S.; Bhattacharya, D.; Pandey, S. B.; Mohan, V.; Castro-Tirado, A. J.; Rao, A. P.; Trushkin, S. A.; Nizhelskij, N. A.; Bermer, M.; Ceron, J. M. C. (2001)
    We report photometric observations of the optical afterglow of GRB 010222 in V, R, and I passbands carried out between 22-77 February 2001 at Nainital. We determine the CCD Johnson BV and Cousins RI photometric magnitude ...
  • Optical follow-up of GRB afterglows from UPSO, Naini Tal 
    Pandey, S. B.; Sagar, R.; Mohan, V.; Pandey, A. K.; Bhattacharya, D.; Castro-Tirado, A. J. (2001)
    Successful optical photometric observations of live GRB afterglows namely GRB 990123, GRB 991216, GRB 000301c and GRB 000926 have been carried out from State Observatory Naini Tal till 2000. the reesults and light curve ...
  • Optical observations of GRB 060124 afterglow: a case for an injection break 
    Misra, K.; Bhattacharya, D.; Sahu, D. K.; Sagar, R.; Anupama, G. C.; Castro-Tirado, A. J.; Guziy, S. S.; Bhatt, B. C. (2007)
    We present broad band optical afterglow observations of a long duration GRB 060124 using the 1.04-m Sampurnanand Telescope at ARIES, Nainital and the 2.01-m HCT at IAO, Hanle, including the earliest ground-based observations ...

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