1770005

The blazar OJ287 was recently seen in high MWL state (ATELs 13637 13658 13677 13702) including a bright radio flare seen at Effelsberg. Swift/XRT observed a 0.3-10 keV flux of 2e-11 erg/s/cm2 on April 23 2020. Although it is not granted that the source is or will be bright also in hard X-rays considering the generally very interesting MWL state and the importance of having a good SED constraint in this band a deep IBIS observation is recommended as even a UL will be very useful to constrain the inverse Compton peak. In order to maximize the IBIS exposure we choose the 5x5 dither pattern. [truncated! Please see actual data for full text]

耀变体（blazar）OJ287近期处于高多波长（Multi-Wavelength, MWL）态，相关天文电报（Astronomer's Telegram, ATel）编号为13637、13658、13677、13702，其中埃费尔斯贝格望远镜观测到一次明亮的射电耀发。雨燕X射线望远镜（Swift/XRT）于2020年4月23日观测到其0.3-10 keV能段的流量为2×10⁻¹¹ 尔格每秒每平方厘米。鉴于该源目前处于极具科研价值的多波长高态，且在该能段获取优质光谱能量分布（Spectral Energy Distribution, SED）约束极为重要，但目前尚无法确定其在硬X射线波段是否同样明亮，因此建议开展一次深度IBIS观测——即便仅能获得探测上限（upper limit, UL），也将为逆康普顿峰的约束提供极大助力。为最大化IBIS的有效曝光时长，我们选用5×5抖动模式（dither pattern）。[内容已截断，请查阅完整原始数据以获取全部文本]