Radio Astronomy Systems Research Group

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====== Focal L band Array for the Green Bank Telescope (FLAG) ======

===== Overview =====

The Focal L band Array for the Green Bank Telescope (FLAG) is the most sensitive phased array radio camera demonstrated to date. Digitally synthesized beams provide a wide field observation capability and flexibility for different observation scenarios. FLAG is available for scientific usage at L band on a scheduled basis on the GBT. The digital back end processes up to 150 MHz of instantaneous bandwidth, tunable from  1200-1500 MHz.

{{:flag_public:flag_front_end.png?400|}}

===== Information for FLAG Observers =====

FLAG is currently transitioning from expert user mode to "guided user mode." The software is functional and includes a user interface suitable for array observations, calibration, beamforming, and imaging. The FLAG team is available to provide training and guidance for prospective users and a modest learning curve should be expected. If you are interested in using FLAG, please contact one of the FLAG PIs for guidance.

==== User Documentation ====

FLAG Technical Specifications: {{ :flag_public:flagtechnicaldocument.pdf |}}

FLAG User Manual: {{ :flag_public:flag_user_manual.pdf |}}

Spectral line mode processing: {{ :flag_public:spectrallinepostprocessingsoftware.pdf |}}

==== Software details ====

This document provides details on the software used to process data for FLAG.

{{ :flag_public:flag_software_details.pdf |}}

===== Publications =====

[[https://academic.oup.com/mnras/article-abstract/489/2/1709/5549522|K. M. Rajwade, "A 21 cm pilot survey for pulsars and transients using the Focal L-Band Array for the Green Bank Telescope," Monthly Notices of the Royal Astronomical Society, 2019]]

[[https://iopscience.iop.org/article/10.3847/1538-3881/aab965/meta|A. Roshi et al, "Performance of a Highly Sensitive, 19-element, Dual-polarization, Cryogenic L-band Phased-array Feed on the Green Bank Telescope," Astronomical Journal, 2018]]

{{ :flag_public:pingel_flag_thesis_chapter.pdf |}}
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