Prompt X-ray emission from Fast Radio Bursts -- Upper limits with AstroSat

Abstract

Fast Radio Bursts (FRBs) are short lived ($\sim$ msec), energetic transients (having a peak flux density of $\sim$ Jy) with no known prompt emission in other energy bands. We present results of a search for prompt X-ray emissions from 41 FRBs using the Cadmium Zinc Telluride Imager (CZTI) on AstroSat which continuously monitors $\sim 70\%$ of the sky. Our searches on various timescales in the 20-200 keV range, did not yield any counterparts in this hard X-ray band. We calculate upper limits on hard X-ray flux, in the same energy range and convert them to upper bounds for $\eta$: the ratio X-ray to radio fluence of FRBs. We find $\eta \le 10^{8-10}$ for hard X-ray emission. Our results will help constrain the theoretical models of FRBs as the models become more quantitative and nearer, brighter FRBs are discovered.

14 pages, 3 tables, 8 figures

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• Multiwavelength observations of Fast Radio Bursts
• A search for prompt gamma-ray counterparts to fast radio bursts in the Insight-HXMT data
• Limits on Fast Radio Burst-like Counterparts to Gamma-ray Bursts using CHIME/FRB
• Multi-wavelength and Multi-messenger Counterparts of Fast Radio Bursts
• Constraining the transient high-energy activity of FRB180916.J0158+65 with Insight-HXMT followup observations
• The Search for Fast Transients with CZTI
• Contemporaneous X-ray Observations of 30 Bright Radio Bursts from the Prolific Fast Radio Burst Source FRB 20220912A
• Constraining Near-Simultaneous Radio Emission from Short Gamma-ray Bursts using CHIME/FRB
• FRB131104 Swift BAT data revisited: No evidence of a gamma-ray counterpart
• A targeted search for FRB counterparts with Konus-Wind
• Simultaneous view of the FRB~180301 with FAST and NICER during a bursting phase
• Using collimated CZTI as all sky X-ray detector based on Earth Occultation Technique