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The Australian SKA Pathfinder (ASKAP) radio telescope has carried out asurvey of the entire Southern Sky at 887.5MHz. The wide area, high angularresolution, and broad bandwidth provided by the low-band Rapid ASKAP ContinuumSurvey (RACS-low) allow the production of a next-generation rotation measure(RM) grid across the entire Southern Sky. Here we introduce this project asSpectral and Polarisation in Cutouts of Extragalactic sources from RACS(SPICE-RACS). In our first data release, we image 30 RACS-low fields in Stokes$I$, $Q$, $U$ at 25'' angular resolution, across 744 to 1032MHz with 1MHzspectral resolution. Using a bespoke, highly parallelised, software pipeline weare able to rapidly process wide-area spectro-polarimetric ASKAP observations.Notably, we use 'postage stamp' cutouts to assess the polarisation propertiesof \ncomponents\ radio components detected in total intensity. We find that ourStokes $Q$ and $U$ images have an rms noise of ~80$\mu$Jy/PSF, and ourcorrection for instrumental polarisation leakage allows us to characterisecomponents with >1% polarisation fraction over most of the field of view. Weproduce a broadband polarised radio component catalogue that contains \nrms\ RMmeasurements over an area of ~1300deg^2 with an average error in RM of1.6+1.1-1.0rad/m^2, and an average linear polarisation fraction 3.4+3.0-1.6%.We determine this subset of components using the conditions that the polarisedsignal-to-noise ratio is $>8$, the polarisation fraction is above our estimatedpolarised leakage, and the Stokes $I$ spectrum has a reliable model. Ourcatalogue provides an areal density of $4\pm2$ RMs/deg^2; an increase of$\sim4$ times over the previous state-of-the-art (Taylor et al. 2009). Meaningthat, having used just 3% of the RACS-low sky area, we have produced the 3rdlargest RM catalogue to date. This catalogue has broad applications forstudying...

The Rapid ASKAP Continuum Survey III: Spectra and Polarisation In Cutouts of Extragalactic Sources (SPICE-RACS) First Data Release