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21cm intensity mapping experiments are bringing an influx of high spectralresolution observational data in the $\sim100$ MHz $- 1$ GHz regime. We usepilot $971-1075$ MHz data from MeerKAT in single-dish mode, recently used totest the calibration and data reduction scheme of the upcoming MeerKLASSsurvey, to probe the spectral index of diffuse synchrotron emission below 1 GHzwithin $145^{\circ} < \alpha < 180^{\circ}$, $-1^{\circ} < \delta < 8^{\circ}$.Through comparisons with data from the OVRO Long Wavelength Array and the Maipuand MU surveys, we find an average spectral index of $-2.75 < \beta < -2.71$between 45 and 1055 MHz. By fitting for spectral curvature with a spectralindex of the form $\beta + c \, {\rm{ln}}(\nu / 73~{\rm MHz})$, we measure$\beta = -2.55 \pm 0.13$ and $c = -0.12 \pm 0.05$ within our target field. Ourresults are in good agreement (within $1\sigma$) with existing measurementsfrom experiments such as ARCADE2 and EDGES. These results show the calibrationaccuracy of current data and demonstrate that MeerKLASS will also be capable ofachieving a secondary science goal of probing the interstellar medium.

Measurements of the diffuse Galactic synchrotron spectral index and curvature from MeerKLASS pilot data