The catalogue contains detections at >3σ at 100 and 160 μm for 46 sources, and the typical noise at these wavelengths is 44 and 49 mJy. The 1σ noise for source detection, including both confusion and instrumental noise, is 7.4, 9.4 and 10.2 mJy at 250, 350 and 500 μm. This paper describes the Herschel images and catalogues of the sources detected on the SPIRE 250 μm images. In this paper and the companion Paper II, we present the survey of three fields on the celestial equator, covering a total area of 161.6 deg 2 and previously observed in the Galaxy and Mass Assembly (GAMA) spectroscopic survey. The Herschel Astrophysical Terahertz Large Area Survey (H-ATLAS) is a survey of 600 deg 2 in five photometric bands – 100, 160, 250, 350 and 500 μm – with the Photoconductor Array Camera and Spectrometer and Spectral and Photometric Imaging Receiver (SPIRE) cameras. We present the first major data release of the largest single key-project in area carried out in open time with the Herschel Space Observatory.
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