Central Bureau for Astronomical Telegrams
IAUC 6924: XTE J2012+381; 1998S
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Circular No. 6924
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
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XTE J2012+381
R. M. Wagner, Ohio State University; S. Starrfield, Arizona
State University; and C. Shrader, Goddard Space Flight Center,
report: "LONEOS Schmidt camera CCD images obtained on May 27.4
(IAUC 6920) and 28.3 UT by B. Skiff (Lowell Observatory) were
examined within the improved RXTE/PCA error circle (IAUC 6922) and
compared to the Digital Sky Survey (DSS). No new objects were
found in the LONEOS images within the x-ray error circle that are
not on the DSS down to mag about 19. Also, none of the objects
within the error circle that are present on the LONEOS images
appears to have exhibited significant variability with respect to
the DSS. In addition, comparison of the LONEOS images within the
x-ray error circle does not reveal any new objects on May 28.3 as
compared to May 27.4, to a limiting magnitude of about 19. In
addition, no objects within the error circle and present on these
images exhibit variability exceeding 0.1 mag (3 sigma), down to mag
18 between the two epochs. Continued monitoring of the error
circle is encouraged."
R. M. Hjellming and M.P. Rupen, National Radio Astronomy
Observatory (NRAO); and A. J. Mioduszewski, Joint Institute for
VLBI in Europe and NRAO, report: "On May 31.25 UT, a radio source
was observed with the Very Large Array in the field of the x-ray
transient XTE J2012+381 at R.A. = 20h12m37s.70, Decl. =
+38o11'01".2 (equinox 2000.0; uncertainty 0".5), with flux
densities of 2 and 1.5 mJy at 1.4 and 4.9 GHz, respectively. This
radio source is well within the error region for the RXTE ASM
position reported on IAUC 6920 and 19" outside the error region for
the RXTE PCA position reported on IAUC 6922. It was not present in
an NVSS survey image obtained on 1995 Apr. 28, with an upper limit
of about 1 mJy. The source is a candidate for the radio
counterpart of XTE J2012+381, but significant radio variability
still needs to be established."
SUPERNOVA 1998S IN NGC 3877
Additional CCD photometry by D. Hanzl, Brno, Czech Republic
(cf. IAUC 6885): Apr. 27.971 UT, V = 13.57 +/- 0.02, B-V = +1.01
+/- 0.04; 30.838, 13.66 +/- 0.02, +0.95 +/- 0.03; May 2.925, 13.77
+/- 0.04, +0.98 +/- 0.09; 5.904, 13.88 +/- 0.02, +1.00 +/- 0.06;
8.887, 13.97 +/- 0.01, +0.97 +/- 0.03; 10.919, 14.07 +/- 0.02,
+1.03 +/- 0.03; 20.876, 14.76 +/- 0.03, -; 28.896, 15.08 +/- 0.05,
-; 29.878, 15.1 +/- 0.1, -; 31.926, 15.12 +/- 0.04, -.
(C) Copyright 1998 CBAT
1998 June 1 (6924) Daniel W. E. Green
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