July 1, 2015: In AAVSO Alert Notice 522 [1]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 [2]). 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 [3], 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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[1] http://www.aavso.org/aavso-alert-notice-522
[2] http://gcn.gsfc.nasa.gov/gcn3/17929.gcn3
[3] http://www.aavso.org/aavso-alert-notice-520
[4] http://www.aavso.org/webobs
[5] http://www.aavso.org/alert-notice-archive
[6] http://www.aavso.org/observation-notification#alertnotices
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[8] http://www.aavso.org/category/tags/v404-cyg
[9] http://www.aavso.org/category/tags/errata
[10] http://www.aavso.org/category/tags/correction
[11] http://www.aavso.org/category/tags/black-hole
[12] http://www.aavso.org/category/tags/alert-notice-522
[13] http://www.aavso.org/category/tags/aavso-international-database
[14] http://www.aavso.org/category/tags/front-page-news
[15] http://www.aavso.org/category/tags/aavso-alert-notice
[16] http://www.aavso.org/category/tags/x-ray