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Browsing Aryabhatta Research Institute of Observational Sciences by Author "Ghosh, Ankur"

Browsing Aryabhatta Research Institute of Observational Sciences by Author "Ghosh, Ankur"

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  • GRB 210217A: a short or a long GRB? 
    Panchal, Dimple; Mishra, Kuntal; Ghosh, Ankur; Arun, K. G.; Gupta, Rahul; Kumar, Amit; Resmi, L.; Pandey, S. B. (Journal of Astrophysics & Astronomy, 2022-12)
    Gamma-ray bursts are traditionally classified as short and long bursts based on their T90 value (the time interval during which an instrument observes 5% to 95% of gamma-ray/hard X-ray fluence). However, T90 is dependent ...
  • The long-active afterglow of GRB 210204A: detection of the most delayed flares in a gamma-ray burst 
    Kumar, Harsh, et.al.; Gupta, Rahul; Aryan, Amar; Dimple; Ghosh, Ankur; Kumar, Amit; Mishra, Kuntal; Pandey, Shashi Bhushan; Ror, Amit Kumar (Monthly Notices of the Royal Astronomical Society, 2022-06)
    We present results from extensive broadband follow-up of GRB 210204A over the period of 30 d. We detect optical flares in the afterglow at 7.6 × 105 s and 1.1 × 106 s after the burst: the most delayed flaring ever detected ...
  • Modeling the late-time merger ejecta emission in short gamma ray bursts 
    Ghosh, Ankur; Misra, Kuntal, et.al.; Omar, Amitesh; Panchal, Dimple (Journal Astrophysical Astronomy, 2022-12)
    The short gamma ray bursts (GRBs) are the aftermath of the merger of binary compact objects (neutron star–neutron star or neutron star–black hole systems). With the simultaneous detection of gravi tational wave (GW) signal ...
  • Revealing nature of GRB 210205A, ZTF21aaeyldq (AT2021any) and follow-up observations with the 4K 4K CCD imager + 3.6m DOT 
    Gupta, Rahul; Kumar, Amit; Pandey, Shashi Bhushan, et.al.; Ghosh, Ankur; Dimple; Misra, Kuntal; Kumar, Brajesh; Aryan, Amar (Journal Astrophysical Astronomy, 2022-06)
    Optical follow-up observations of optical afterglows of gamma-ray bursts are crucial to probe the geometry of outflows, emission mechanisms, energetics and burst environments. We performed the follow-up observations of ...
  • Search for merger ejecta emission from late-time radio observations of short GRBs using GMRT 
    Ghosh, Ankur; Vaishnava, C. S.; Resmi, L.; Misra, Kuntal; Arun, K. G.; Omar, Amitesh; Chakradhari, N. K. (Monthly Notices of the Royal Astronomical Society, 2024-01)
    In some cases, the merger of two neutron stars can produce a rapidly rotating and highly magnetized millisecond magnetar. A significant proportion of the rotational energy deposited to the emerging ejecta can produce a ...
  • Study of GRBs-on Aspects of Multi-Wavelength Emission, Environment and Host Galaxies 
    Ghosh, Ankur (ARIES, Nainital, 2022)
    Gamma-ray Bursts (GRBs) are powerful astronomical transient events emitting enormous energy in -rays within a short period. They provide a unique laboratory for studying relativistic e ects such as beaming, jets, shocks ...

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