The VLITE-Fast experiment combines the wide-field-of-view of single dish antennas operating at low frequency with the high angular resolution furnished by the 3–30 km baselines of the VLA, making it ideal for the detection and precise localization of radio transients. We describe the VLITE-Fast experiment, its capabilities, and operational status, and we briefly overview its main science case, the detection of fast radio bursts (FRBs) and determination of their host galaxies. We report on commissioning observations in an incoherent mode prohibiting precise localization. These include discovery of FRB 20200405A, detected during early science operations at dispersion measure (DM) = 212.3 pc cm⁻³, strongly in excess of the Galactic DM along the line of sight.

VLITE-Fast 实验结合了在低频下工作的单碟天线的宽视场与 VLA 3-30 公里基线提供的高角分辨率，使其成为无线电检测和精确定位的理想选择瞬变。我们描述了 VLITE-Fast 实验、它的能力和运行状态，并简要概述了它的主要科学案例、快速射电暴 (FRB) 的检测及其宿主星系的确定。我们报告了以禁止精确定位的不连贯模式进行的观察。其中包括发现 FRB 20200405A，在早期科学操作中以色散测量 (DM) = 212.3 pc cm ^-3检测到，沿视线强烈超过银河系 DM。