RapidGBM inspects and analyzes transient events using data from the Fermi Gamma-ray Burst Monitor (GBM) on the Fermi Gamma-ray Space Telescope. The web-based tool checks whether a source at a specified sky position and time is observable by GBM, accounting for Earth occultation and spacecraft passages through the South Atlantic Anomaly using spacecraft position history files. The code retrieves time-tagged event data, generates light curves, estimates backgrounds, and computes signal-to-noise ratios to assess candidate signals. RapidGBM extracts source and background spectra and produces detector response matrices using the GBM Response Generator. Spectral fitting is performed through PyXspec (ascl:2101.014), enabling rapid evaluation of spectral parameters such as photon index, peak energy, and energy flux.