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IAUC 6938: GRB 980613; XTE J1748-288; V4334 Sgr

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                                                 Circular No. 6938
Central Bureau for Astronomical Telegrams
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
URL http://cfa-www.harvard.edu/iau/cbat.html
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GRB 980613
     M. J. S. Smith, BeppoSAX Science Operation Center (SOC), Rome,
and Space Research Organization of the Netherlands (SRON); R.
Ricci, SOC; J. in 't Zand, SRON; M. Feroci, L. Piro, and P.
Soffitta, Istituto di Astrofisica Spaziale, CNR, Rome; and N.
Masetti and E. Palazzi, Istituto Tecnologie e Studio Radiazioni
Extraterrestri, CNR, Bologna, communicate:  "A weak gamma-ray burst
was observed by the BeppoSAX Gamma Ray Burst Monitor on June
13.20215 UT.  The preliminary analysis shows a duration of about 50
s and a peak intensity of 250 counts/s in the energy band 40-700
keV.  The burst was also detected in Wide Field Camera (WFC) unit 2
with comparable duration and a peak intensity of about 0.6 +/- 0.1
Crab (2-25 keV).  The preliminary position as derived from the WFC
image is R.A. = 10h17m44s, Decl. = +71o29'.9 (equinox 2000.0), with
an error radius of 4'.  A follow-up observation with BeppoSAX
narrow-field instruments has been in progress since June 13.56.
Observations in all bands are solicited."

XTE J1748-288
     M. P. Rupen, R. M. Hjellming, National Radio Astronomy
Observatory (NRAO); and A. J. Mioduszewski, Joint Institute for
VLBI in Europe and NRAO, report:  "VLA imaging of the highly
variable radio counterpart of XTE J1748-288 (IAUC 6934, 6937) show
that, although preliminary analysis indicates it was an unresolved
source with a size < 0".1 on June 10.19 UT, on June 14.31 it was
extended east-west with size about 0".25, indicating proper motions
of >/= 20-40 mas/day, depending upon whether it was two-sided or
one-sided jet ejection.  June 15.2 observations confirmed this
result.  Preliminary fluxes for June 14.31 are 590, 410, 330, 280,
and 200 mJy at 1.46, 4.86, 8.46, 14.9, and 22.5 GHz, respectively."

     H. U. Kaeufl, European Southern Observatory (ESO); and B.
Stecklum, Thuringer Landessternwarte, Tautenburg, write: "Using the
ESO 3.6-m telescope (+ thermal infrared instrument TIMMI) on June
12, we observed V4334 Sgr (cf. IAUC 6601, 6896) in the atmospheric
N band in two filters.  The observed fluxes were 5.7 Jy in a
silicon carbide filter (10.3-13.0 microns) and 8.2 Jy in the 9.7-
11.3-micron filter.  The object is of stellar appearance.  The
upper limit for a potential apparent spatial extent of the infrared
emitting region of V4334 Sgr is 1".0."

                      (C) Copyright 1998 CBAT
1998 June 15                   (6938)            Daniel W. E. Green

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