Indirect measurement of the Hubble Constant through stereoscopic gamma-ray observations with CTA-LST and MAGIC

立体声硬件触发器已经安装和验证，特别是我们购买并部署了一条新的触发器电缆连接LST摄像机和魔术计数屋，与之前的安装相比，触发器行程缩短了约500 ns。这对于及时传递LST触发器以建立与魔术望远镜的重合触发器非常重要，因为魔术望远镜具有相对较短的模拟缓冲长度。我们还在魔术触发系统中安装了新的固件，并开发了软件代码来控制和监测LST和魔术望远镜之间的天顶和方位角相关触发延迟。调整了触发时序，并在硬件立体模式下获取了几个测试数据集，同时完成了推导河外背景光密度约束条件的方法学工作，该约束条件可直接用于约束哈勃常数H0。

The stereo hardware trigger has been installed and validated.In particular, we purchased and deployed a new trigger cable between the LST camera and MAGIC counting house shortening the trigger travel time by about 500ns compared to the previous installation. This is important to deliver the LST trigger in time to build a coincidence trigger with the MAGIC telescopes because MAGIC telescopes have a relatively short analog buffer length. We also installed a new firmware in MAGIC trigger system and developed the software code to control and monitor zenith and azimuth dependent trigger delays between LST and MAGIC telescopes. The trigger timing has been adjusted and several test data sets has been taken in hardware stereo mode.In the same time work on methodology to derive constraints on the density of the Extragalactic Background Light has been done, which can be directly used to constrain the Hubble constant H0.