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Optical observations of the transient 1RXS J180408.9-342058

ATel #7100; M. C. Baglio (Universita` dell'Insubria, Como), S. Campana (INAF-Osservatorio Astronomico di Brera), P. D'Avanzo (INAF-Osservatorio Astronomico di Brera)
on 18 Feb 2015; 14:38 UT
Credential Certification: Maria Cristina Baglio (cristina.baglio@brera.inaf.it)

Subjects: Optical, Binary, Neutron Star, Transient

Referred to by ATel #: 7255

We report on optical observations of the galactic transient 1RXS J180408.9-342058, currently in outburst (Krimm et al., ATel #6997; Negoro et al., ATel #7008). Observations were carried out with the instrument EFOSC2 mounted on the ESO/NTT (La Silla, Chile) on Feb 08, 2015 between 08:35 UT and 09:01 UT. We obtained a series of eight 15s images in the optical VR filters.
The optical counterpart of 1RXS J180408.9-34205 is clearly detected at the following position (J2000):

RA= 18h 04m 08.371s = 271.03488 (deg)
dec: -34d 20' 51.38'' = -34.34767 (deg)
with an uncertainty of 0.5''.

We obtained for the source the following mean Vega magnitudes:

V=17.1 +/- 0.1
R=17.0 +/- 0.1

The magnitudes are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.48 in the direction of the object (Schlegel et al. 1998) and are calibrated against the GSC-II catalog.
The source position is consistent with the value reported in Atel #7039 (Krimm et al.).