[vsnet-alert 19366] Swift triggers on V404 Cyg (ATel #8455)

[Patrick Schmeer]

Swift triggers on V404 Cyg (ATel #8455)

A. P. Beardmore (U. Leicester), K. L. Page
(U. Leicester), E. Kuulkers (ESAC/ESA)
on 23 Dec 2015; 17:00 UT

On 2015-Dec-23 at 05:19:52 UT, the Swift
Burst Alert Telescope (BAT) triggered and
located a source consistent with V404 Cyg
(trigger=668097; GCN Circ. 18716). As is
typical with BAT image triggers, the real-time
light curve did not show anything significant.
However, this is the first automatic detection
of V404 Cyg by BAT since the on-board
trigger threshold level was reset back to the
pre-2015 June outburst value for the source
on 2015-Aug-03.
...
The Swift UV and Optical Telescope (UVOT)
obtained white and v-band images of the field
which showed the source at magnitudes of
17.79+/-0.06 and 16.23+/-0.25, respectively.
The latter is consistent with the MASTER-
Tunka observations taken 3.5 hours later
(GCN Circ. 18718). 

Further Swift observations have been
approved in an attempt to determine whether
the source is entering another active phase.

Complete text:
http://www.astronomerstelegram.org/?read=8455

Merry Christmas and clear skies!
Patrick