1. School of Physical Sciences, Swami Ramanand Teerth Marathwada University, Nanded-431 606, India
2. National Centre for Radio Astrophysics (NCRA), Tata Institute of Fundamental Research (TIFR), Pune-411 007, India
3. Inter-University Centre for Astronomy and Astrophysics (IUCAA), Pune-411 007, India