The S-PLUS Ultra-Short Survey: first data release
H\'elio D. Perottoni, Vinicius M. Placco, Felipe Almeida-Fernandes,, F\'abio R. Herpich, Silvia Rossi, Timothy C. Beers, Rodolfo Smiljanic, Jo\~ao, A. S. Amarante, Guilherme Limberg, Ariel Werle, Helio J. Rocha-Pinto, Leandro, Beraldo e Silva, Simone Daflon

TL;DR
The paper introduces the first data release of the S-PLUS Ultra-Short Survey, a photometric survey targeting bright, metal-poor stars in the Southern sky, providing calibrated data and candidate selection for follow-up spectroscopy.
Contribution
It presents the initial data release, calibration methods, and candidate selection process for identifying extremely metal-poor stars using a novel 12-band photometric system.
Findings
Data for 163 fields covering 324 deg$^{2}$ are released.
Magnitudes are well-calibrated with ~15 mmag accuracy.
140 candidates for EMP or UMP stars identified for follow-up.
Abstract
This paper presents the first public data release of the S-PLUS Ultra-Short Survey (USS), a photometric survey with short exposure times, covering approximately 9300 deg of the Southern sky. The USS utilizes the Javalambre 12-band magnitude system, including narrow and medium-band and broad-band filters targeting prominent stellar spectral features. The primary objective of the USS is to identify bright, extremely metal-poor (EMP; [Fe/H] ) and ultra metal-poor (UMP; [Fe/H] ) stars for further analysis using medium- and high-resolution spectroscopy.}{This paper provides an overview of the survey observations, calibration method, data quality, and data products. Additionally, it presents the selection of EMP and UMP candidates.}{The data from the USS were reduced and calibrated using the same methods as presented in the S-PLUS DR2. An additional step was…
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