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Alert Notice 523: Correction to AAVSO Alert Notice 522

July 1, 2015:  In AAVSO Alert Notice 522 on the upcoming observations of the black hole X-ray binary V404 Cyg by HST, the date of the detection by the Swift satellite was incorrectly given as 2015 June 16.77197 UT (Barthelmy et al., GCN Circular 17929). The correct date is 2015 June 15.77197 UT.

Our sincere apologies for this error!

The date was correctly given in AAVSO Alert Notice 520, which announced the outburst.

Thanks to Patrick Schmeer for drawing our attention to this error.

Coordinates for V404 Cyg: 20 24 03.83 +33 52 02.2  (J2000.0)

This AAVSO Alert Notice was compiled by Elizabeth O. Waagen.

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