标题： 提示 VERITAS 观测由高能费米LAT光子触发 显示英文标题

标题： Prompt VERITAS Observations Triggered by High Energy Fermi-LAT Photons

摘要： 在任何24小时周期内，费米-LAT检测到的能量约为100 GeV的光子不与任何已知的VHE发射体相关。这些光子的赤经/赤纬通常会在次日晚上落入VERITAS的视场内。由于IACT（成像大气切连科夫技术）方法具有优越的收集面积，LAT中的单个光子可能意味着地面上可检测到的许多光子。在2011-2012观测季节，VERITAS实施了一个新的机会目标（ToO）计划，以对最高能量的LAT光子的小样本触发VERITAS观测。每个触发观测的光子是在前24小时内由LAT检测到的，并且在空间上不与已知的VHE发射体相关。我们在此呈现这些ToO观测的结果、所使用方法的讨论以及我们的未来计划。 显示英文摘要

摘要： In any given 24-hour period, the Fermi-LAT detects photons with energies of order 100 GeV not associated with any known VHE emitter. The RA/Dec of these photons frequently falls into the field of view of VERITAS the following evening. A single photon in the LAT can potentially mean many detectable photons on the ground due to the superior collection area of the IACT (Imaging Atmospheric Cherenkov Technique) method. During the 2011-2012 observing season, VERITAS implemented a new target-of-opportunity (ToO) program to trigger VERITAS observations on a small sample of the highest energy LAT photons. Each photon that triggered observation was detected by the LAT within the previous 24-hour period and was not spatially associated with a known VHE emitter. We present here the results of these ToO observations, a discussion of the method used, and our future plans.