The coincidental detection of the gravitational wave event GW 170817 and the gamma-ray burst GRB 170817A marked the advent of multi-messenger astronomy and represented a milestone in the study of GRBs. Significant progress in this field is expected in the coming years with the increased sensitivity of gravitational waves detectors and the launch of new facilities for the high-energy survey of the sky. In this context, the launch of SVOM in mid-2022, with its two wide-field high-energy instruments ECLAIRs and GRM, will foster the possibilities of coincidental transient detection with gravitational waves and gamma-rays events. The purpose of this paper is to assess the ability of SVOM/ECLAIRs to detect and quickly characterize high-energy transients in the local Universe (z ≤ 0.3), and to discuss the contribution of this instrument to multi-messenger astronomy and to gamma-ray burst (GRB) astrophysics in the 2020’s. A list of local HE transients, along with their main characteristics, is constructed through an extensive literature survey. This list includes 41 transients: 24 long GRBs, 10 short GRBs and 7 SGR Giant Flares. The detectability of these transients with ECLAIRs is assessed with detailed simulations using tools developed for the SVOM mission, including a GEANT4 simulation of the energy response and a simulated trigger algorithm representative of the onboard trigger algorithm. SVOM/ECLAIRs would have been able to detect 88% of the short high-energy transients in our list: 22 out of 24 long GRBs, 8 out of 10 short GRBs and 6 out of 7 SGR Giant Flares. The SNR for almost all detections will be sufficiently high to allow the on-board ECLAIRs trigger algorithm to derive the localisation of the transient, transmitting it to the SVOM satellite and ground-based instruments. Coupled with the anti-solar pointing strategy of SVOM, this will enable an optimal follow-up of the events, allowing the observation of their afterglows, supernovae/kilonovae counterparts, and host galaxies. We conclude the paper with a discussion of the unique contribution expected from SVOM and of the possibility of simultaneous GW detection for each type of transient in our sample.

中文翻译：

---

使用 SVOM/ECLAIR 检测局部宇宙中的短高能瞬变

引力波事件 GW 170817 和伽马射线暴 GRB 170817A 的巧合探测标志着多信使天文学的出现，也是 GRB 研究的里程碑。随着引力波探测器灵敏度的提高以及用于高能天空勘测的新设施的推出，预计未来几年该领域将取得重大进展。在此背景下，2022 年年中发射的 SVOM 及其两个宽场高能仪器 ECLAIR 和 GRM，将促进利用引力波和伽马射线事件进行巧合瞬态探测的可能性。本文的目的是评估 SVOM/ECLAIRs 检测和快速表征局部宇宙 (z ≤ 0.3) 中高能瞬变的能力，并讨论该仪器在 2020 年代对多信使天文学和伽马射线暴 (GRB) 天体物理学的贡献。通过广泛的文献调查构建了局部 HE 瞬变及其主要特征的列表。该列表包括 41 个瞬变：24 个长 GRB、10 个短 GRB 和 7 个 SGR 巨型耀斑。使用为 SVOM 任务开发的工具，包括能量响应的 GEANT4 模拟和代表机载触发算法的模拟触发算法，通过详细模拟评估 ECLAIR 对这些瞬变的可检测性。SVOM/ECLAIR 将能够检测到我们列表中 88% 的短高能瞬变：24 个长 GRB 中的 22 个，10 个短 GRB 中的 8 个和 7 个 SGR 巨型耀斑中的 6 个。几乎所有探测的 SNR 都足够高，以允许机载 ECLAIR 触发算法得出瞬态的定位，将其传输到 SVOM 卫星和地面仪器。再加上 SVOM 的反太阳指向策略，这将能够对事件进行最佳跟踪，从而可以观察它们的余辉、超新星/千新星对应物和宿主星系。我们通过讨论 SVOM 预期的独特贡献以及对我们样本中每种类型的瞬变同时检测 GW 的可能性来结束本文。这将能够对事件进行最佳跟踪，从而可以观察到它们的余辉、超新星/千新星对应物和宿主星系。我们通过讨论 SVOM 预期的独特贡献以及对我们样本中每种类型的瞬变同时检测 GW 的可能性来结束本文。这将能够对事件进行最佳跟踪，从而可以观察到它们的余辉、超新星/千新星对应物和宿主星系。我们通过讨论 SVOM 预期的独特贡献以及对我们样本中的每种瞬态同时检测 GW 的可能性来结束本文。