On the basis that you have standard credits and cut-off point for a single person and no other deductions apart from the pension and tax/ levies(anything different will change the answer below), I calculate the following since the start of May:
Gross 615.80 Less
Pension 44.56
PAYE 43.86
PRSI 40.61 [Including Health Levy 22.85]
Income levy 12.32 Net pay474.45 per week
Prior to May 1st, you'd have been earning €492.03. PRSI (incl health contribution) would have been €29.18 per week and income levy would have been €6.16.
I wrote an Excel calculator [see taxcalc.eu/monthlyss] which you can download to check net salary queries if you wish.