Correlated optical, X-ray, and γ-ray flaring activity seen with INTEGRAL during the 2015 outburst of V404 Cygni

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Volume 581 (September 2015)

A&A, 581 (2015) L9

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Table 1

List of the >6 Crab flares and their main properties.

Name	Start^a	Peak time	Stop^a	CR_3−13keV^b	CR_20−40keV^b	Properties^c
	(MJD)	(MJD)	(MJD)	(cts/s)	(cts/s)

I	57 193.9217	57 193.9356	57 193.9402	184	1215	Multiple
II	57 193.9703	57 193.9981	57 194.0827	181	1234	Multiple
III	57 194.0827	57 194.1152	57 194.1428	1055	5209	Complex
IV	57 194.2232	57 194.3107	57 194.3938	2010	7040	Isolated/Complex
Va^d	57 194.6273	57 194.6399	57 194.6521	473^e	3328	Multiple/Complex, preceded by plateau
Vb^d	57 194.6521	57 194.6579	57 194.6708	852	3999	Multiple/Complex
VI	57 194.6960	57 194.7346	57 194.7473	129	1974	Isolated/Complex
VII	57 194.9788	57 194.9996	57 195.0089	459	2200	Multiple/Complex
VIII	57 195.0089	57 195.0293	57 195.0501	865	4950	Multiple/Complex
IX	57 195.0582	57 195.0826	57 195.1095	320	2386	Multiple/Complex
X	57 195.2318	57 195.2503	57 195.2712^f	577^g	3472	Multiple, preceded by succession of ~6 Crab peaks
XI	57 195.4294	57 195.4388	57 195.4450	857	7036	Multiple
XIIa^d	57 195.4450	57 195.4573	57 195.4665	401	3525	Multiple/Complex
XIIb^d	57 195.4665	57 195.4723	57 195.4841	1231	6299	Multiple, followed by plateau
XIII	57 197.1373	57 197.1785	57 197.1924	2076	7081	Multiple, preceded by plateau
XIV	57 197.1924	57 197.2020	57 197.2067	1240	4368	Multiple
XV	57 197.2124	57 197.2228	57 197.2310	210	1793	Multiple/Complex
XVI	57 197.3450	57 197.3647	57 197.3705	151	1036	Isolated

Notes. MJD 57 193 is 2015 June 20.

^(a)

Start (resp. stop) time of a flare is defined as the time 20–40 keV CR reaches 165 cts/s (1 Crab) during the increase (resp. decrease), or by the minimum reached before (resp. after) the increase (decrease) for multiple flares. The uncertainty on the times is ±6 × 10^-4 d.

^(b)

Count rates at the peaks.

^(c)

“Multiple” stands for series of well-defined flares occurring in rapid repetition. “Complex" stands for flares showing various peaks. “Plateau” indicates a >1 Crab plateau.

^(d)

These peaks appear as single peaks in Fig. 1. They are in fact true multiples.

^(e)

The 3–13 keV peak time occurred about 200 s before the 20–40 keV one, indicating a potential hard lag.

^(f)

Data gap at the end of the flare. The stop time is the last point before the gap.

^(g)

The 3–13 keV peak time occurred about 200 s after the 20–40 keV one, indicating a potential soft lag.

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