View here: Details for Alert Notice 742: V1405 Cas = N Cas 2021 brightening
Abstract: V1405 Cas (Nova Cas 2021), discovered on March 18 UT at unfiltered CCD magnitude 9.6, is undergoing a sudden increase in brightness. Further observations are requested as it continues to evolve.
Justification: Please observe V1405 Cas as it continues to evolve, with observations of all types (visual, CCD, DSLR, PEP, spectroscopy) and multiple bands as instrumentation permits. Frequency of observation depends on the rate of change, but should be at least one observation per night per band.