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Flash ionization signatures in the type Ibn supernova SN 2019uo
Anjasha Gangopadhyay, Kuntal Misra, Daichi Hiramatsu +26
We present photometric and spectroscopic observations of the type Ibn supernova (SN) 2019uo, the second ever SN Ibn with flash ionization (He II, C III, N III) features in its earl…
Low frequency view of GRB 190114C reveals time varying shock micro-physics
K. Misra, L. Resmi, D. A. Kann +25
We present radio and optical afterglow observations of the TeV-bright long Gamma Ray Burst (GRB) 190114C at a redshift of , which was detected by the MAGIC telescope. Our…
SN 2015an: a normal luminosity type II supernova with low expansion velocity at early phases
Raya Dastidar, Kuntal Misra, Stefano Valenti +10
We present the photometry and spectroscopy of SN 2015an, a Type II Supernova (SN) in IC 2367. The recombination phase of the SN lasts up to 120 d, with a decline rate of 1.24…
A Long-term photometric variability and spectroscopic study of luminous blue variable AF And in M31
Yogesh C. Joshi, Kaushal Sharma, Anjasha Gangopadhyay +2
We present photometric and spectroscopic analysis of the Hubble Sandage variable AF And in M31. The data has been taken under the Nainital Microlensing Survey during 1998-2002 and…
SN 2017gmr: An energetic Type II-P supernova with asymmetries
Jennifer E. Andrews, D. J. Sand, S. Valenti +77
We present high-cadence ultraviolet (UV), optical, and near-infrared (NIR) data on the luminous Type II-P supernova SN 2017gmr from hours after discovery through the first 180 days…
The late-time afterglow evolution of long gamma-ray bursts GRB 160625B and GRB 160509A
Tuomas Kangas, Andrew S. Fruchter, S. Bradley Cenko +12
We present post-jet-break \textit{HST}, VLA and \textit{Chandra} observations of the afterglow of the long -ray bursts GRB 160625B (between 69 and 209 days) and GRB 160509A (bet…
VR CCD photometry of variable stars in globular cluster NGC 4147
Sneh Lata, A. K. Pandey, J. C. Pandey +20
We present results of a search for variable stars in a region of the globular cluster NGC 4147 based on photometric observations with 4k x 4k CCD imager mounted at the axial port o…
On the nature of the unusual transient AT 2018cow from HI observations of its host galaxy
Michał J. Michałowski, P. Kamphuis, J. Hjorth +23
Unusual stellar explosions represent an opportunity to learn about both stellar and galaxy evolution. Mapping the atomic gas in host galaxies of such transients can lead to an unde…