Prospects for the Detection of High-Redshift Gamma-Ray Bursts in the Era of EP and SVOM
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arXiv
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| Formato: | Preprint |
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2025
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| _version_ | 1866911063048454144 |
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| author | Wei, Jun-Jie Wu, Xue-Feng |
| author_facet | Wei, Jun-Jie Wu, Xue-Feng |
| contents | Gamma-ray bursts (GRBs) are a promising probe of the high-redshift Universe, but their detection remains observationally challenging. In this work, we explore the detectability of high-$z$ GRBs by the Wide-field X-ray Telescope (WXT) aboard the Einstein Probe (\emph{EP}) and the coded-mask gamma-ray imager (ECLAIRs) aboard the Space-based multi-band astronomical Variable Objects Monitor (\emph{SVOM}). Using a population synthesis model calibrated to $Swift$ GRB observations, we develop a tool to estimate high-$z$ GRB detection rates for instruments with specific energy bands and sensitivities. Our results indicate that \emph{EP}/WXT could detect $\sim5.1^{+3.4}_{-2.4}$ (with 68\% confidence level) GRBs annually at $z>6$, compared to $\sim0.7^{+1.0}_{-0.4}$ $\mathrm{events\,yr^{-1}}$ at $z>6$ for \emph{SVOM}/ECLAIRs. While \emph{EP} cannot independently determine redshifts (requiring optical/near-infrared follow-up), its assumed $\sim30\%$ follow-up efficiency yields $\sim1.5^{+1.0}_{-0.7}$ confirmed $z>6$ GRBs annually. \emph{SVOM}, equipped with dedicated follow-up telescopes, will promptly identify high-$z$ candidates deserving deep near-infrared spectroscopy to ensure robust confirmation of high-$z$ GRBs. We anticipate that \emph{EP} and \emph{SVOM} will open new avenues for utilizing enlarged samples of high-$z$ GRBs to explore the early Universe. Moreover, \emph{EP} will assemble a substantial sample of soft, low-luminosity GRBs at low-to-intermediate redshifts, providing critical insights into the structure of GRB jets. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2506_04709 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Prospects for the Detection of High-Redshift Gamma-Ray Bursts in the Era of EP and SVOM Wei, Jun-Jie Wu, Xue-Feng High Energy Astrophysical Phenomena Gamma-ray bursts (GRBs) are a promising probe of the high-redshift Universe, but their detection remains observationally challenging. In this work, we explore the detectability of high-$z$ GRBs by the Wide-field X-ray Telescope (WXT) aboard the Einstein Probe (\emph{EP}) and the coded-mask gamma-ray imager (ECLAIRs) aboard the Space-based multi-band astronomical Variable Objects Monitor (\emph{SVOM}). Using a population synthesis model calibrated to $Swift$ GRB observations, we develop a tool to estimate high-$z$ GRB detection rates for instruments with specific energy bands and sensitivities. Our results indicate that \emph{EP}/WXT could detect $\sim5.1^{+3.4}_{-2.4}$ (with 68\% confidence level) GRBs annually at $z>6$, compared to $\sim0.7^{+1.0}_{-0.4}$ $\mathrm{events\,yr^{-1}}$ at $z>6$ for \emph{SVOM}/ECLAIRs. While \emph{EP} cannot independently determine redshifts (requiring optical/near-infrared follow-up), its assumed $\sim30\%$ follow-up efficiency yields $\sim1.5^{+1.0}_{-0.7}$ confirmed $z>6$ GRBs annually. \emph{SVOM}, equipped with dedicated follow-up telescopes, will promptly identify high-$z$ candidates deserving deep near-infrared spectroscopy to ensure robust confirmation of high-$z$ GRBs. We anticipate that \emph{EP} and \emph{SVOM} will open new avenues for utilizing enlarged samples of high-$z$ GRBs to explore the early Universe. Moreover, \emph{EP} will assemble a substantial sample of soft, low-luminosity GRBs at low-to-intermediate redshifts, providing critical insights into the structure of GRB jets. |
| title | Prospects for the Detection of High-Redshift Gamma-Ray Bursts in the Era of EP and SVOM |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2506.04709 |