Publications

This is a complete list of publications by members of STAR Lab, IIT Bombay. For a list of publications by Varun Bhalerao, see his page.

Refereed papers

1. Singhal, Akshat, Palit, Sourav, Bala, Suman, et al. Gravitational waves and electromagnetic transients, Journal of Astrophysics and Astronomy, 43, 53, 2022. Group members: Suman Bala, Gaurav Waratkar, Harsh Kumar, Varun Bhalerao

2. Kumar, Abhay, Chattopadhyay, Tanmoy, Vadawale, Santosh V., et al. Extending the energy range of AstroSat-CZTI up to 380 keV with compton spectroscopy, MNRAS, 516, 3102, 2022. Group members: Varun Bhalerao

3. Kumar, Harsh, Bhalerao, Varun, Anupama, G. C., et al. GROWTH on S190426c II: GROWTH-India Telescope search for an optical counterpart with a custom image reduction and candidate vetting pipeline, MNRAS, 2022. Group members: Harsh Kumar, Varun Bhalerao, Divita Saraogi, Gaurav Waratkar

4. Kumar, Sandeep, Bala, Suman, & Bhattacharya, Dipankar A new Monte Carlo radiative transfer simulation of cyclotron resonant scattering features, MNRAS, 515, 914, 2022. Group members: Suman Bala

5. Chattopadhyay, Tanmoy, Gupta, Soumya, Iyyani, Shabnam, et al. Hard X-Ray Polarization Catalog for a Five-year Sample of Gamma-Ray Bursts Using AstroSat CZT Imager , APJ, 936, 12, 2022. Group members: Divita Saraogi, Varun Bhalerao

6. Kumar, Harsh, Bhalerao, Varun, Anupama, G. C., et al. India’s First Robotic Eye for Time-domain Astrophysics: The GROWTH-India Telescope, AJ, 164, 90, 2022. Group members: Harsh Kumar, Varun Bhalerao, Vishwajeet Swain, Gaurav Waratkar

7. Kumar, Harsh, Gupta, Rahul, Saraogi, Divita, et al. The long-active afterglow of GRB 210204A: detection of the most delayed flares in a gamma-ray burst, MNRAS, 513, 2777, 2022. Group members: Harsh Kumar, Divita Saraogi, Varun Bhalerao

8. Ahumada, Tomás, Anand, Shreya, Coughlin, Michael W., et al. In Search of Short Gamma-Ray Burst Optical Counterparts with the Zwicky Transient Facility, APJ, 932, 40, 2022. Group members: Harsh Kumar, Varun Bhalerao

9. Gupta, Rahul, Gupta, S., Chattopadhyay, T., et al. Probing into emission mechanisms of GRB 190530A using time-resolved spectra and polarization studies: synchrotron origin? , MNRAS, 511, 1694, 2022. Group members: Harsh Kumar, Divita Saraogi, Varun Bhalerao

10. Dutta, Anirban, Sahu, D. K., Anupama, G. C., et al. SN 2020sck: Deflagration in a Carbon-Oxygen White Dwarf , APJ, 925, 217, 2022. Group members: Harsh Kumar, Varun Bhalerao

11. Perley, Daniel A., Ho, Anna Y. Q., Yao, Yuhan, et al. Real-time discovery of AT2020xnd: a fast, luminous ultraviolet transient with minimal radioactive ejecta, MNRAS, 508, 5138, 2021. Group members: Harsh Kumar, Varun Bhalerao

12. Singhal, Akshat, Bhalerao, Varun, Mahabal, Ashish A., et al. Deep co-added sky from Catalina Sky Survey images, MNRAS, 507, 4983, 2021. Group members: Akshat Singhal, Varun Bhalerao

13. Mate, Sujay, Chattopadhyay, Tanmoy, Bhalerao, Varun, et al. The AstroSat mass model: Imaging and flux studies of off-axis sources with CZTI, JApA, 42, 93, 2021. Group members: Sujay Mate, Varun Bhalerao, Arvind Balasubramanian, Sourav Palit, Divita Saraogi

14. Chattopadhyay, Tanmoy, Gupta, Soumya, Sharma, Vidushi, et al. Sub-MeV spectroscopy with AstroSat-CZT imager for gamma ray bursts, JApA, 42, 82, 2021. Group members: Sourav Palit, Varun Bhalerao

15. Vibhute, Ajay, Bhattacharya, Dipankar, Mithun, N. P. S., et al. Imaging calibration of AstroSat Cadmium Zinc Telluride Imager (CZTI), JApA, 42, 76, 2021. Group members: Varun Bhalerao

16. Sharma, Y., Marathe, A., Bhalerao, V., et al. The search for fast transients with CZTI, JApA, 42, 73, 2021. Group members: Yashvi Sharma, Aditi Marathe, Varun Bhalerao, Vedant Shenoy, Gaurav Waratkar, Drishika Nadella, Pranav Page, Pawan Hebbar

17. Palit, Sourav, Anumarlapudi, Akash, & Bhalerao, Varun Revisiting the Earth's atmospheric scattering of X-ray/γ-rays and its effect on space observation: Implication for GRB spectral analysis, JApA, 42, 69, 2021. Group members: Sourav Palit, Akash Anumarlapudi, Varun Bhalerao

18. Kumar, Abhay, Chattopadhyay, Tanmoy, Vadawale, Santosh V., et al. Exploring sub-MeV sensitivity of AstroSat-CZTI for ON-axis bright sources, JApA, 42, 67, 2021. Group members: Varun Bhlaerao

19. Singhal, Akshat, Srinivasan, Rahul, Bhalerao, Varun, et al. Using collimated CZTI as all-sky X-ray detector based on Earth occultation technique, JApA, 42, 64, 2021. Group members: Akshat Singhal, Rahul Srinivasan, Varun Bhalerao

20. Anusree, K. G., Bhattacharya, D., Rao, A. R., et al. AstroSat-CZTI as a hard X-ray pulsar monitor, JApA, 42, 63, 2021. Group members: Varun Bhalerao

21. Ratheesh, A., Rao, A. R., Mithun, N. P. S., et al. A generalized event selection algorithm for AstroSat CZT imager data, JApA, 42, 37, 2021. Group members: Varun Bhalerao

22. Andreoni, Igor, Coughlin, Michael W., Kool, Erik C., et al. Fast-transient Searches in Real Time with ZTFReST: Identification of Three Optically Discovered Gamma-Ray Burst Afterglows and New Constraints on the Kilonova Rate, ApJ, 918, 63, 2021. Group members: Harsh Kumar, Varun Bhalerao, Divita Saraogi, Kritti Sharma, Vedant Shenoy

23. Gupta, Rahul, Oates, S. R., Pandey, S. B., et al. GRB 140102A: insight into prompt spectral evolution and early optical afterglow emission, MNRAS, 505, 4086, 2021. Group members: Varun Bhalerao

24. Ahumada, Tomás, Singer, Leo P., Anand, Shreya, et al. Discovery and confirmation of the shortest gamma-ray burst from a collapsar, NatAs, 5, 917, 2021. Group members: Harsh Kumar, Varun Bhalerao

25. Misra, K., Resmi, L., Kann, D. A., et al. Low frequency view of GRB 190114C reveals time varying shock micro-physics, MNRAS, 504, 5685, 2021. Group members: Harsh Kumar, Varun Bhalerao

26. Abraham, Sheelu, Mukund, Nikhil, Vibhute, Ajay, et al. A machine learning approach for GRB detection in AstroSat CZTI data, MNRAS, 504, 3084, 2021. Group members: Varun Bhalerao

27. Purdum, Josiah N., Lin, Zhong-Yi, Bolin, Bryce T., et al. Time-series and Phase-curve Photometry of the Episodically Active Asteroid (6478) Gault in a Quiescent State Using APO, GROWTH, P200, and ZTF, ApJL, 911, L35, 2021. Group members: Kritti Sharma, Harsh Kumar, Varun Bhalerao

28. Bolin, Bryce T., Fernandez, Yanga R., Lisse, Carey M., et al. Initial Characterization of Active Transitioning Centaur, P/2019 LD2 (ATLAS), Using Hubble, Spitzer, ZTF, Keck, Apache Point Observatory, and GROWTH Visible and Infrared Imaging and Spectroscopy, AJ, 161, 116, 2021. Group members: Kunal Deshmukh, Varun Bhalerao

29. Anumarlapudi, A., Bhalerao, V., Tendulkar, S. P., et al. Prompt X-Ray Emission from Fast Radio Bursts—Upper Limits with AstroSat. ApJ, 888(1), 40, 2020. Group members: Akash Anumarlapudi, Varun Bhalerao, Arvind Balasubramanian

30. Andreoni, I., Goldstein, D. A., Kasliwal, M. M., et al., GROWTH on S190814bv: Deep Synoptic Limits on the Optical/Near-infrared Counterpart to a Neutron Star─Black Hole Merger. ApJ, 890(2), 131, 2020. Group members: 

31. Bolin, B. T., Lisse, C. M., Kasliwal, M. M., et al., Characterization of the Nucleus, Morphology, and Activity of Interstellar Comet 2I/Borisov by Optical and Near-infrared GROWTH, Apache Point, IRTF, ZTF, and Keck Observations. AJ, 160(1), 26, 2020. Group members: Kunal Deshmukh, Varun Bhalerao

32. Sharma, V., Iyyani, S., Bhattacharya, D., et al. Spectropolarimetric analysis of prompt emission of GRB 160325A: jet with evolving environment of internal shocks. MNRAS, 493(4),5218, 2020. Group members: Varun Bhalerao

33. Belloni, T. M., Bhattacharya, D., Caccese, P., et al. A variable-frequency HFQPO in GRS 1915+105 as observed with AstroSat. MNRAS, 489(1), 1037, 2019. Group members: Varun Bhalerao

34. Bhargava, Y., Bhalerao, Varun, Ballhausen, R., et al. Explaining the asymmetric line profile in Cepheus X-4 with spectral variation across pulse phase. MNRAS, 482, 2902, 2019. Group members: Varun Bhalerao

35. Chand, V., Chattopadhyay, T., Oganesyan, G., et al. AstroSat-CZTI Detection of Variable Prompt Emission Polarization in GRB 171010A. ApJ, 874, 70, 2019. Group members: Varun Bhalerao

36. Chattopadhyay, T., Vadawale, S. V., Aarthy, E., et al. Prompt Emission Polarimetry of Gamma- Ray Bursts with the AstroSat CZT Imager. ApJ, 884(2), 123, 2019. Group members: Sujay Mate, Arvind Blasubramanian, Varun Bhalerao

37. Coughlin, M. W., Ahumada, T., Anand, S., et al. GROWTH on S190425z: Searching Thousands of Square Degrees to Identify an Optical or Infrared Counterpart to a Binary Neutron Star Merger with the Zwicky Transient Facility and Palomar Gattini-IR. ApJ Letters, 885(1), L19, 2019. Group members: Harsh Kumar, Gaurav, Waratkar, Viraj Karambelkar, Yashvi Sharma, Varun Bhalerao

38. Ho, A. Y. Q., Phinney, E. S., Ravi, V., et al. AT2018cow: A Luminous Millimeter Transient. ApJ, 871, 73, 2019. Group members: Varun Bhalerao

39. Perley, D. A., Mazzali, P. A., Yan, L., et al. The fast, luminous ultraviolet transient AT2018cow: extreme supernova, or disruption of a star by an intermediate-mass black hole? MNRAS, 484, 1031, 2019. Group members: Tanazza Khanam, Harsh Kumar, Shubham Srivastava, Varun Bhalerao

40. Sharma, V., Iyyani, S., Bhattacharya, D., et al. Time-varying Polarized Gamma-Rays from GRB 160821A: Evidence for Ordered Magnetic Fields. ApJ Letters, 882(1), L10, 2019. Group members: Varun Bhalerao

41. Singh, A., Sahu, D. K., Anupama, G. C., et al. SN 2018hna: 1987A-like Supernova with a Signature of Shock Breakout. ApJ Letters, 882(2), L15, 2019. Group members: Harsh Kumar, Varun Bhalerao

42. Chand, V., Chattopadhyay, T., Iyyani, S., et al. Violation of Synchrotron Line of Death by the Highly Polarized GRB 160802A. ApJ, 862, 154, 2018. Group members: Varun Bhalerao

43. Mooley, K. P., Nakar, E., Hotokezaka, K., et al. A mildly relativistic wide-angle outflow in the neutron-star merger event GW170817. Nature, 554, 207, 2018. Group members: Varun Bhalerao

44. Vadawale, S. V., Chattopadhyay, T., Mithun, N. P. S., et al. Phase-resolved X-ray polarimetry of the Crab pulsar with the AstroSat CZT Imager. Nature Astronomy, 2, 50, 2018. Group members: Varun Bhalerao

45. Abbott, B. P., Abbott, R., Abbott, T. D., et al. Multi-messenger Observations of a Binary Neutron Star Merger. ApJ, 848, L12, 2017. Group members: Arvind Balasubramanian, Sujay Mate, Varun Bhalerao

46. Hallinan,G., Corsi,A., Mooley,K.P.,et al. A radio counterpart to a neutron star merger. Science, 358, 1579, 2017. Group members: Varun Bhalerao

47. Bhalerao, V., Bhattacharya, D., Vibhute, A., et al. The Cadmium Zinc Telluride Imager on AstroSat. Journal of Astrophysics and Astronomy, 38, 31, 2017. Group members: Varun Bhalerao

48. Bhalerao, V., Kasliwal, M. M., Bhattacharya, D., et al. A Tale of Two Transients: GW 170104 and GRB 170105A. ApJ, 845, 152, 2017. Group members: Sujay Mate, Varun Bhalerao

49. Kasliwal, M. M., Nakar, E., Singer, L. P., et al. Illuminating gravitational waves: A concordant picture of photons from a neutron star merger. Science, 358, 1559, 2017. Group members: Varun Bhalerao

50. Rana, J., Singhal, A., Gadre, B., et al. An Enhanced Method for Scheduling Observations of Large Sky Error Regions for Finding Optical Counterparts to Transients. ApJ, 838,108, 2017. Group members: Javed Rana, Akshat Singhal, Varun Bhalerao

51. Rao, A. R., Patil, M. H., Bhargava, Y., et al. Charged Particle Monitor on the Astrosat Mission. Journal of Astrophysics and Astronomy, 38, 33, 2017. Group members: Varun Bhalerao

52. Srivastava, V., Bhalerao, V., Ravi, A. P., et al. Geographic and Annual Influences on Optical Follow-up of Gravitational Wave Events. ApJ, 838,46, 2017. Group members: Varun Bhalerao

Circulars

ATELs, GCNs, and other non-refereed publications