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安装并验证。特别是，我们购买并部署了LST相机和MAGIC计数室之间的新触发电缆，与之前的安装相比，缩短了约500ns的触发行程时间。由于MAGIC望远镜的模拟缓冲长度相对较短，因此及时提供LST触发器以构建与MAGIC望远镜的巧合触发器非常重要。我们还在MAGIC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控LST和MAGIC望远镜之间的天顶和方位角相关触发延迟。已经调整了触发时间，并在硬件立体模式下采取了几个测试数据集。与此同时，推导河外背景光密度约束的方法也已经完成，这可以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.