DOI: 10.5061/dryad.wm37pvn0b
title: Data from: A Search for Technosignatures Around 11,680 Stars with the Green Bank Telescope at 1.15–1.73 GHz

description: This dataset describes candidate signal detections obtained at the Green
 Bank Telescope in 2020–2023 and processed with the UCLA SETI data
 processing pipeline. We conducted a search for narrowband radio signals
 over four observing sessions in 2020–2023 with the L-band receiver
 (1.15–1.73 GHz) of the 100 m diameter Green Bank Telescope. We pointed the
 telescope in the directions of 62 TESS Objects of Interest, capturing
 radio emissions from a total of ∼11,680 stars and planetary systems in the
 ∼9′ beam of the telescope. All detections were either automatically
 rejected or visually inspected and confirmed to be of anthropogenic
 nature. We also quantified the end-to-end efficiency of radio SETI
 pipelines with a signal injection and recovery analysis. The UCLA SETI
 pipeline recovers 94.0% of the injected signals over the usable frequency
 range of the receiver and 98.7% of the injections when regions of dense
 radio frequency interference are excluded. In another pipeline that uses
 incoherent sums of 51 consecutive spectra, the recovery rate is ∼15 times
 smaller at ∼6%. The pipeline efficiency affects calculations of
 transmitter prevalence and SETI search volume. Accordingly, we developed
 an improved Drake figure of merit and a formalism to place upper limits on
 transmitter prevalence that take the pipeline efficiency and transmitter
 duty cycle into account. Based on our observations, we can state at the
 95% confidence level that fewer than 6.6% of stars within 100 pc host a
 transmitter that is continuously transmitting a narrowband signal with an
 equivalent isotropic radiated power (EIRP) &gt; 1013 W. For stars
 within 20,000 ly, the fraction of stars with detectable transmitters (EIRP
 &gt; 5 × 1016 W) is at most 3 × 10−4. Finally, we showed that the UCLA
 SETI pipeline natively detects the signals detected with AI techniques by
 Ma et al.
description: # A Search for Technosignatures Around 11,680 Stars with the Green Bank
 Telescope at 1.15–1.73 GHz Dataset DOI:
 [10.5061/dryad.wm37pvn0b](10.5061/dryad.wm37pvn0b) ## Description of the
 data and file structure This dataset describes the results of a search for
 technosignatures in the directions of 62 stars, capturing radio emissions
 from a total of ∼11,680 stars and planetary systems in the ~9 arcminute
 beam of the L-band receiver (1.15–1.73 GHz) of the 100 m diameter Green
 Bank Telescope.  Data were processed with the UCLA SETI data processing
 pipeline. ### Files and variables #### Files: GBT20200422.csv,
 GBT20210428.csv, GBT20220522.csv, GBT20230513.csv **Description:**  Each
 file is a comma-separated-values list of candidate technosignatures
 obtained on 20200422, 20210428, 20220522, and 20230513, respectively.
 ##### Variables The field descriptions are as follows: * ID: a unique
 integer identifier for the signal * NAME: the name of the source * SCAN:
 the scan index number (1, 2) for the source * MJD: the Modified Julian
 Date at the start of the scan * FREQ: the frequency (Hz) at the start of
 the scan * DFDT: the rate of change in frequency (Hz/s) * Z: the signal
 power integrated over the scan duration aka Z score (standard deviations
 of the noise) * PROM: the signal power integrated over the scan duration
 measured with respect to the local noise baseline (standard deviations of
 the noise) * BW: an estimate of the bandwidth (FWHM) of the signal (Hz) *
 FSNR: a flag set to Y if signal power exceeds detection threshold * FDOP:
 a flag set to Y if DFDT is **not** zero * FBTH: a flag set to Y if signal
 is detected in both scans of this source * FOTH: a flag set to Y if signal
 is **not** detected in scans of other sources * FAND: a flag set to Y if
 FSNR=FDOP=FBTH=FOTH=Y * PARTNER: the ID of the signal in a subsequent scan
 of this source, if known * RFICODE: an identifier for the probable source
 of radio frequency interference (RFI) * NOTES: additional notes ```
 +---------+--------------+ | Field | Type | +---------+--------------+ |
 ID | int(11) | | NAME | varchar(50) | | SCAN | int(11) | | MJD |
 double(16,8) | | FREQ | double(20,6) | | DFDT | double(14,8) | | Z |
 double(15,3) | | PROM | double(15,3) | | BW | double(8,1) | | FSNR |
 char(1) | | FDOP | char(1) | | FBTH | char(1) | | FOTH | char(1) | | FAND
 | char(1) | | PARTNER | int(11) | | RFICODE | char(5) | | NOTES | text |
 +---------+--------------+ ``` ## Code/software Any software that can read
 comma-separated-values files.