I am an astrophysicist. My research interest lies in high energy astrophysics including multi-wavelength and multi-messenger observations and data analysis of most exotic phenomenon in the universe such as gamma ray bursts. 

Academic & Employment Profile

• Assistant Professor: Indian Institute of Science Education and Research Thiruvananthapuram (2021 - Present)
• INSPIRE Faculty Fellow: Indian Institute of Science Education and Research Thiruvananthapuram (2021 - Present)
• INSPIRE Faculty Fellow: Inter-University Centre for Astronomy and Astrophysics (IUCAA), Pune (2020 - 2021)  
• Vaidya Raychaudhury Post Doctoral Prize Fellow: Inter-University Centre for Astronomy and Astrophysics (IUCAA), Pune (2016 - 2020)
• Visiting Postdoctoral Fellow: Tata Institute of Fundamental Research (TIFR), Mumbai (Jan 2016 - July 2016)
• Visiting Doctoral Fellow: Laboratoire Univers et Particules de Montpellier, France (2013)
• Erasmus Mundus Joint Doctoral Fellow: Stockholm University, Sweden (2011 - 2015)

Research Interests

• High energy astrophysics
• Multi-wavelength astronomy
• Multi-messenger astronomy
• Gamma ray bursts
• Statistical and Data Analysis in Astronomy

Publications

• Referred Journals

1. Hard X-Ray Polarization Catalog for a Five-year Sample of Gamma-Ray Bursts Using AstroSat CZT Imager, Chattopadhyay, Tanmoy; Gupta, Soumya; Iyyani, Shabnam, et al., ApJ, 936, 12 (2022)  
2. Onset of Particle Acceleration during the Prompt Phase in Gamma-Ray Bursts as Revealed by Synchrotron Emission in GRB 160821A, Ryde, Felix; Iyyani, Shabnam; et al, ApJL, 932, L15 (2022) 
3. Probing into emission mechanisms of GRB 190530A using time-resolved spectra and polarization studies: synchrotron origin?, Gupta, Rahul;  Gupta, S; ...., Iyyani, Shabnam; et al, MNRAS, 511, 1694 (2022) 
4. Sub-MeV spectroscopy with AstroSat-CZT imager for gamma ray bursts, Chattopadhyay, Tanmoy; Gupta, Soumya; Sharma, Vidushi; Iyyani, Shabnam; et al, Journal of Astroph. Astron., 42, 82 (2021)
5. Study of the Prompt Emission of Short Gamma-Ray Bursts Using a Multicolor Blackbody: A Clue to the Viewing Angle, Iyyani, Shabnam and Sharma, Vidushi, ApJS, 255, 25 (2021)
6. Discovery and confirmation of the shortest gamma-ray burst from a collapsar, Ahumada} Tom{\'a}; Singer, Leo P.; ... Iyyani, Shabnam,.. et al, Nature Astronomy, 5, 917 (2021) 
7. A machine learning approach for GRB detection in AstroSat CZTI data, Abraham, Sheelu; ...., Iyyani, Shabnam;... et al, MNRAS, 504, 3084 (2021)
8.  Identifying Black Hole Central Engines in Gamma-Ray Bursts, Sharma, Vidushi; Iyyani, Shabnam and Bhattacharya, Dipankar, ApjL, 908, L2 (2021)
9. Spectropolarimetric analysis of prompt emission of GRB 160325A: jet with evolving environment of internal shocks, Sharma, Vidushi; Iyyani, Shabnam;... et al, MNRAS, 493, 5218 (2020)
10. Time-varying Polarized Gamma-Rays from GRB 160821A: Evidence for Ordered Magnetic Fields, Sharma, Vidushi; Iyyani, Shabnam;... et al, ApJL, 882, L10 (2019)
11. Violation of Synchrotron Line of Death by the Highly Polarized GRB 160802A, Chand, Vikas; Chattopadhyay, Tanmoy; Iyyani, Shabnam; ... et al., ApJ, 862, 154 (2018)
12. Surprise in simplicity: an unusual spectral evolution of a single pulse GRB 151006A, Basak, Rupal; Iyyani, Shabnam; ... et al, MNRAS, 472, 891 (2017)
13. AstroSat CZT Imager Observations of GRB 151006A: Timing, Spectroscopy, and Polarization Study, Rao, A.R; ...; Iyyani, Shabnam;... et al, ApJ, 833, 86 (2016)
14. Synchrotron emission in GRBs observed by Fermi: its limitations and the role of the photosphere, Iyyani, Shabnam; Ryde, Felix;... et al, MNRAS, 456, 2157 (2016)
15. Extremely narrow spectrum of GRB110920A: further evidence for localized, subphotospheric dissipation, Iyyani, Shabnam; Ryde Felix; ... et al, MNRAS, 450, 1651 (2015)
16. Transparency Parameters from Relativistically Expanding Outflows, Begue, Damien and Iyyani, Shabnam, ApJ, 792, 42 (2014)
17. An Observed Correlation between Thermal and Non-thermal Emission in Gamma-Ray Bursts, Burgess, J. Michael;  Preece, Robert D;...; Iyyani, Shabnam,.. et al, ApJL, 784, L43 (2014)
18. Time-resolved Analysis of Fermi Gamma-Ray Bursts with Fast- and Slow-cooled Synchrotron Photon Models, Burgess, J.Michael and Preece, R.D;...; Iyyani, Shabnam;.. et al, ApJ, 784,17 (2014)
19. The First Pulse of the Extremely Bright GRB 130427A: A Test Lab for Synchrotron Shocks, Preece, R; Burgess J. Michael;...; Iyyani, Shabnam;... et al, Science, 343, 51 (2014)
20. Variable jet properties in GRB 110721A: time resolved observations of the jet photosphere, Iyyani, Shabnam; Ryde, Felix;... et al, MNRAS, 433, 2739 (2013)
21. GRB110721A: An Extreme Peak Energy and Signatures of the Photosphere, Axelsson, M; Baldini, L; ... Iyyani, Shabnam;.. et al. ApJL, 757, L31 (2012)

• Invited Reviews 

1. Recent advances in the study of the prompt emission of gamma-ray bursts, Iyyani, Shabnam, Journal of Astroph. Astron., 43, 37, (2022) 
2. Observations and physics of prompt emission of gamma ray bursts, Iyyani, Shabnam, Journal of Astroph. Astron., 39, 75, (2018) 
3. Explosive and Radio-Selected Transients: Transient Astronomy with Square Kilometre Array and its Precursors, Chandra, Poonam, Anupama, G.C.; Arun, K.G.; Iyyani, Shabnam; ... et al, Journal of Astroph. Astron., 37, 30 (2016)

• PhD Thesis: ‘Photospheric emission in gamma ray bursts: analysis and interpretations of the observations by Fermi gamma ray space telescope.’, PhD Thesis, University of Stockholm, Sweden; Erasmus Mundus Joint Doctorate Fellowship (2015).