Sensex surges 1,233 points; Nifty ends above 23,400, per BusinessLine

1. What happened

   According to a BusinessLine market update, the Sensex rose 1,233 points and the Nifty closed above 23,400. Reliance and Tata Steel were among the top gainers.

2. When it started

   The source headline describes a single trading session, but the exact date is not stated in the information provided.

3. How it spread

   The headline reports the index gains and names Reliance and Tata Steel as top gainers. The source does not give the Sensex closing level or the percentage move.

4. Why it matters

   The available source does not state what drove the rally. Causes would need to be confirmed from the full BusinessLine report or other market coverage.