2011ATel.3151....1B

Query : 2011ATel.3151....1B

2011ATel.3151....1B - The Astronomer's Telegram, 3151, 1 (2011/February-0)

Gamma-ray flaring emission from Cygnus X-3 detected by AGILE.

BULGARELLI A., PITTORI C., STRIANI E., TAVANI M., GIANOTTI F., TRIFOGLIO M., POOLEY G., McCOLLOUGH M., TRUSHKIN S.A., PIANO G., VERRECCHIA F., LUCARELLI F., CARDILLO M., ARGAN A., TROIS A., DE PARIS G., VITTORINI V., COSTA E., DONNARUMMA I., FEROCI M., PACCIANI L., DEL MONTE E., LAZZAROTTO F., SOFFITTA P., EVANGELISTA Y., LAPSHOV I., SABATINI S., CHEN A., GIULIANI A., MARISALDI M., DI COCCO G., LABANTI C., FUSCHINO F., GALLI M., CARAVEO P., MEREGHETTI S., PEROTTI F., PUCELLA G., RAPISARDA M., D'AMMANDO F., VERCELLONE S., PELLIZZONI A., PILIA M., BARBIELLINI G., LONGO F., PICOZZA P., MORSELLI A., PREST M., LIPARI P., ZANELLO D., CATTANEO P.W., RAPPOLDI A., GIOMMI P., SANTOLAMAZZA P., SALOTTI L. and VALENTINI G.

Abstract (from CDS):

AGILE continues to detect gamma-ray flaring emission from a source positionally consistent with the microquasar Cygnus X-3.

Integrating during the period 2011-02-06 05:00 UT to 2011-02-08 09:00 UT (MJD= 55598.21-55600.37) the AGILE-GRID multi-source likelihood analysis finds enhanced gamma-ray emission above 100 MeV from a source at Galactic coordinates (l,b) = (79.46, 0.6) ± 0.7 (stat.) ± 0.1 (syst.) deg, (R.A.,Dec.) J2000 = (307.91, 40.58) deg, with flux F > 250 e-8 ph/cm2/sec for a 4.8 sigma significance.

On 2011-02-07 (MJD 55599) the Swift/BAT data indicate that Cygnus X-3 experienced a brief (∼ 0.2 day) quenching in the hard X-ray. The Swift/BAT data indicate a trend of decreasing hard X-ray emission over the last several weeks.

This gamma ray flaring activity follows the trend already reported in ATel #3141.

In the following <a href=http://www.asdc.asi.it/news/images/20110208CYGX3.jpg>link</A> a 1 day integration intensity map (2011-02-07 05:10 - 2011-02-08 05:50 UT) of the Cygnus region is available.

We strongly encourage multifrequency observations of Cygnus X-3.


Abstract Copyright: ∼

Journal keyword(s): >GeV - Binary - Transient

Simbad objects: 2

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Number of rows : 2
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 NAME Cyg Complex reg 20 32 +45.0           ~ 667 0
2 V* V1521 Cyg HXB 20 32 25.78 +40 57 27.9           WN4/5-6/7 2035 2

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