Hard limit:
All radiation within cone
gets Thomson-scattered
For 90°: 10%, 45°: 2.4%
179: 5%-10%
Not enough. No other indications. Not particularly high luminosity (L=1043.3 erg/s for 179)
Ruled out by model selection
179 was in the first 1Ms sometimes brighter, by factor of 3. other 3 sources do not show any sign of variation. need >30
some are z=1.5-2, faint optical counterparts