2011ATel.3239....1B

Query : 2011ATel.3239....1B

2011ATel.3239....1B - The Astronomer's Telegram, 3239, 1 (2011/March-0)

AGILE detection of Cygnus X-3 above 400 MeV.

BULGARELLI A., STRIANI E., PIANO G., TAVANI M., GIANOTTI F., TRIFOGLIO M., McCOLLOUGH M., SAVOLAINEN P., 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., CARDILLO M., CHEN A., GIULIANI A., MEREGHETTI S., PEROTTI F., MARISALDI M., DI COCCO G., LABANTI C., FUSCHINO F., GALLI M., 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., PITTORI C., VERRECCHIA F., LUCARELLI F., GIOMMI P., SANTOLAMAZZA P., SALOTTI L. and VALENTINI G.

Abstract (from CDS):

The AGILE satellite has been monitoring the Cygnus X-3 region in the spinning mode. The AGILE-GRID detector does not detect significant gamma-ray emission during the period of the Fermi-LAT detection on MJD 55642 (March 22, 2011, ATel #3233). Integrating during the period MJD 55641-55642 (a standard 2-day integration of the AGILE spinning mode) we obtain a 95% confidence level upper limit of 1.1 x 10^-6 ph cm^-2 s^-1 (E > 100 MeV). For E > 400 MeV, we obtain a 95% confidence level upper limit of 0.6 x 10^-6 ph cm^-2 s^-1.

However, integrating during the period MJD 55639-55640 the AGILE-GRID multi-source likelihood analysis finds enhanced gamma-ray emission above

400 MeV from a source positionally consistent with Cygnus X-3 at Galactic

coordinates (l,b)=(80.23, 0.46) ± 0.6 degrees (statistical plus systematic error), (R.A.,Dec.) J2000 =(308.66, 41.12) with a flux F = (0.9 ± 0.3)x10^-6 ph cm^-2 s^-1 at 3.9 standard deviation significance level. For E > 100 MeV, we obtain a marginal detection at a 3 standard deviation significance level with a flux F= (1.4 ± 0.8) x 10^-6 ph cm^-2 s^-1.

We note that this detection occurs a few days before the prominent hard-X ray flux rise shown by the Swift/BAT data near MJD 55643 after several

weeks of low hard X-ray emission.

On MJD 55643 a Swift pointed observation was performed. The spectrum can be adequately fit by an absorbed partial covered disk blackbody with an absorption edge near 7 keV (n_H = 2.6x10^{22} cm^{-2}, n_H(covering) = 4.9x10^{22} cm^{-2}, f_covering = 0.79, T_bb = 1.9 keV). The measured 1-8 keV flux is 7.35x10^{-9} ergs/s/cm^2 (unabsorbed: 1.56x10^{-8} ergs/s/cm^2). The Swift/BAT spectra can be described by a steep (-3.5) power law.

Our detection at 400 MeV and lack of prominent emission in the 100-400 MeV energy band suggests a relatively hard gamma-ray spectrum of this remarkable

event. The Cygnus X-3 spectral properties appear to be different from

what detected by AGILE during the period preceding the strong radio flare and the hard X-ray spectral change of April 16-17, 2008, as reported in Tavani et al., Nature, 462, 620 (2009).

Abstract Copyright: ∼

Journal keyword(s): Gamma Ray - Binary - Black Hole - Neutron Star - Transient

Simbad objects: 1

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Number of rows : 1

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	V* V1521 Cyg	HXB	20 32 25.78	+40 57 27.9						WN4/5-6/7	2035	2

Query : 2011ATel.3239....1B

Basic data :

V* V1521 Cyg -- High Mass X-ray Binary

X (2022MNRAS,X,...), Rad (ECX6,GB6,...), gam (2AGL,1FGL,...), HXB (2013ApJS), Y*? (2021ApJS,SPICY), NIR (2MASS,UGPS), WR* (WR), HX? (2016ApJS), Q? (2021MNRAS), V* (V*), MIR (SSTCYGXC)

20 32 25.78 +40 57 27.9 (Infrared) [ 60 60 90 ] C 2003yCat.2246....0C

20 30 37.63 +40 47 12.6 [ 60 60 90 ]

079.84549 +00.70006 [ 60 60 90 ]

WN4/5-6/7 C 1996A&A...314..521V

J 15.049 [0.003] C 2012yCat.2316....0U

H 13.104 [0.001] C 2012yCat.2316....0U

K 11.707 [0.001] C 2012yCat.2316....0U

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`X Cyg X-3`	`GPS 2030+407`	`1RXS J203226.2+405725`	`1WGA J2032.4+4057`
`3A 2030+407`	`GPSR 079.846+0.700`	`SPICY 112094`	`WR 145a`
`2AGL J2033+4100`	`GT 2030+407`	`SRGA J203225.6+405729`	`4XMM J203225.7+405730`
`2CXO J203225.7+405728`	`1H 2030+407`	`SSTCYGXC G079.8455+00.7000`	`1XRS 20305+407`
`2E 4376`	`H 2030+407`	`SWIFT J2032.5+4055`	`[AAA2018] FGL J2032.1+4058`
`2E 2030.5+4047`	`INTEGRAL1 118`	`SWIFT J2032.4+4057`	`[BM83] X2030+407`
`ECX6-23`	`1M 2030+407`	`2SXPS J203225.7+405727`	`[BSF97] J203225.77+405728.0`
`1ES 2030+40.7`	`2MASS J20322578+4057279`	`TIC 17032547`	`[FS2003] 1076`
`1FGL J2032.4+4057`	`18P 57`	`2U 2030+40`	`[KRL2007b] 376`
`2FGL J2032.1+4049`	`19P 17`	`3U 2030+40`	`[WBC2013] J203225.6+405726`
`4FGL J2032.6+4053`	`PBC J2032.4+4057`	`4U 2030+40`
`GB6 B2030+4047`	`RGB J2032+409`	`UGPS J203225.77+405728.0`
`87GB 203037.0+404726`	`RX J2032.3+4057`	*`V V1521 Cyg`**

References (2035 between 1850 and 2026) (Total 2035)
Simbad bibliographic survey began in 1850 for stars (at least bright stars) and in 1983 for all other objects (outside the solar system).

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Data at NED - NASA/IPAC Extragalactic Database : V* V1521 Cyg

Link by name to the catalogue in VizieR :

2E 4376 2MASS J20322578+4057279 1RXS J203226.2+405725 UGPS J203225.77+405728.0 V* V1521 Cyg

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