2011ATel.3386....1P

Query : 2011ATel.3386....1P

2011ATel.3386....1P - The Astronomer's Telegram, 3386, 1 (2011/May-0)

Enhanced gamma-ray emission detected by AGILE from the Cygnus X-3 region.

PIANO G., TAVANI M., BULGARELLI A., STRIANI E., CARDILLO M., SABATINI S., GIANOTTI F., TRIFOGLIO M., PITTORI C., VERRECCHIA F., LUCARELLI F., ARGAN A., TROIS A., DE PARIS G., COSTA E., DONNARUMMA I., FEROCI M., PACCIANI L., DEL MONTE E., LAZZAROTTO F., SOFFITTA P., EVANGELISTA Y., LAPSHOV I., VITTORINI V., GIUSTI M., CARAVEO P., CHEN A., GIULIANI A., MEREGHETTI S., PEROTTI F., MARISALDI M., DI COCCO G., LABANTI C., FUSCHINO F., GALLI M., PUCELLA G., RAPISARDA M., VERCELLONE S., D'AMMANDO F., 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., VALENTINI G. and SALOTTI L.

Abstract (from CDS):

AGILE is detecting enhanced gamma-ray emission from a source positionally consistent with the microquasar Cygnus X-3.

Integrating during the period 2011-05-28 07:58:37 UT to 2011-05-29 06:02:51 UT (MJD=55709.33-55710.25) the AGILE-GRID detected gamma-ray emission above 100 MeV from a source at Galactic coordinates (l, b) = (79.8, 0.3) ± 0.8 (stat.) ± 0.1 (syst.) deg, and flux F > 300 x 10^-8 photons/cm^2/s above 100 MeV (1-day multi-source-analysis significance in spinning mode ∼4 sigma). The multi-source likelihood analysis was carried out taking into account the gamma-ray sources in the field including the nearby pulsars (PSR J2021+3651, PSR J2021+4026, PSR J2032+4127).

We notice that the hard X-ray lightcurve of Cygnus X-3 as monitored by the BAT/Swift instrument (public data available at http:///heasarc.gsfc.nasa.gov/docs/swift/results/transients/CygX-3 ) shows an overall decreasing trend starting on MJD ∼ 55680. This trend of decreasing hard X-ray emission in conjunction with gamma-ray flaring activity of Cygnus X-3 was already detected several times (Tavani et al., 2009).

We strongly encourage multifrequency observations of Cygnus X-3.

Abstract Copyright: ∼

Journal keyword(s): Gamma Ray - Transient

Simbad objects: 4

View the references in ADS

Number of rows : 4

N	Identifier	Otype	ICRS (J2000) RA	ICRS (J2000) DEC	Mag U	Mag B	Mag V	Sp type	#ref 1850 - 2026	#notes
1	PSR J2021+3651	Psr	20 21 05.40	+36 51 04.5				~	218	1
2	PSR J2021+4026	Psr	20 21 30.496	+40 26 53.56				~	300	2
3	[MT91] 213	Psr	20 32 13.1247390384	+41 27 24.346666440	13.12	13.08	11.266	B0Vp	334	0
4	V* V1521 Cyg	HXB	20 32 25.78	+40 57 27.9				WN4/5-6/7	2035	2

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