Central Bureau for Astronomical Telegrams

Central Bureau for Astronomical Telegrams -- Image credits

IAUC 5838: GRO J1008-57; N Aql 1993; 1993a

The following International Astronomical Union Circular may be linked-to from your own Web pages, but must not otherwise be redistributed (see these notes on the conditions under which circulars are made available on our WWW site).

Read IAUC 5837 SEARCH Read IAUC 5839

View IAUC 5838 in .dvi or .ps format.
IAUC number 

                                                  Circular No. 5838
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Telephone 617-495-7244/7440/7444 (for emergency use only)
TWX 710-320-6842 ASTROGRAM CAM     EASYLINK 62794505
MARSDEN@CFA or GREEN@CFA (.SPAN, .BITNET or .HARVARD.EDU)


GRO J1008-57
     J. E. Grove, R. L. Kroeger, B. Phlips, J. D. Kurfess, and W.
N. Johnson, for the OSSE team; M. H. Finger, R. B. Wilson, B. A.
Harmon, M. T. Stollberg, B. C. Rubin, and G. J. Fishman, for the
BATSE team; and N. Gehrels, for the Compton Gamma-Ray Observatory,
report:  "An improved position for the recently discovered x-ray
pulsar GRO J1008-57 (IAUC 5836) has been obtained by using OSSE
scans of the region along with a re-evaluation of the BATSE Earth
occultation times.  The 90-percent confidence region is bounded by
a box with the following corners:  R.A. = 10h03m, Decl. = -58o25'
(equinox 2000.0); 10h03m, -58o50'; 10h13m, -58o20'; 10h13m, -57o55'.
The source flux observed by BATSE in the energy range 20-120 keV
has remained within 15 percent of the value reported on IAUC 5836
from July 19 to 28."


NOVA AQUILAE 1993
     A. Evans and T. Naylor, Keele University; and L. Koch-Miramond,
Centre d'Etudes de Saclay, report:  "We made polarimetric observations
of N Aql 1993, which J. Elias et al. (IAUC 5831) suggest has
entered a dust phase.  The data, which were obtained in white light
(roughly covering the region of the UBV filters) with the 2-m
Bernard Lyot telescope at Pic du Midi Observatory, yield the following
values:  July 19.0 UT, P = 1.75 +/- 0.15 percent, p.a. 42 +/- 2
deg; July 23.9, 1.90 +/- 0.15 percent, 48 +/- 8 deg.  The high degree
of polarization suggests an intrinsic component.  Further
polarimetric observations are urged to monitor changes."
     Further photoelectric photometry (cf. IAUC 5818, 5829):  June
15.232 UT, V = 9.94 +/- 0.01, B-V = +0.38 +/- 0.01 (D. H. Kaiser,
Columbus, IN); July 7.98, V = 13.00 +/- 0.05 (H. Mikuz, Ljubljana,
Slovenia); 13.90, V = 13.19 +/- 0.05 (Mikuz); 17.94, V = 13.95 +/-
0.05 (Mikuz); 23.92, V = 14.13 +/- 0.05 (Mikuz).


COMET MUELLER (1993a)
     Total magnitude estimates (cf. IAUC 5756):  Apr. 8.86 UT, 13.8
(H. Mikuz, Ljubljana, Slovenia, 0.20-m Baker-Schmidt camera + V
filter + ST-6 CCD); 17.19, 13.1 (C. S. Morris, Pine Mountain Club,
CA, 0.26-m reflector, visual); May 22.85, 13.2 (Mikuz); July 29.08,
12.3 (Mikuz; sunward fan-like tail).


1993 August 4                  (5838)            Daniel W. E. Green

Read IAUC 5837 SEARCH Read IAUC 5839

View IAUC 5838 in .dvi or .ps format.

Our Web policy. Index to the CBAT/MPC/ICQ pages.

Valid HTML 4.01!