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IAUC 6726: GRB 970828; XTE J1755-324; C/1997 P2

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                                                 Circular No. 6726
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
BMARSDEN@CFA.HARVARD.EDU or DGREEN@CFA.HARVARD.EDU (science)
URL http://cfa-www.harvard.edu/cfa/ps/cbat.html
Phone 617-495-7244/7440/7444 (for emergency use only)


GRB 970828
     R. Remillard, A. Wood, D. Smith, and A. Levine, Massachusetts
Institute of Technology, communicate:  "The RXTE All Sky Monitor
has detected the gamma-ray burst of Aug. 28.73931 UT that was
logged as BATSE trigger no. 6350.  The burst was detected by ASM
camera 1 with a mean flux of 756 mCrab (2-12 keV) averaged over the
40 s in which the burst was seen before the camera was rotated.
Ninety seconds later, ASM camera 2 scanned over the source and
determined a crossing line of position and an average flux of 238
mCrab, declining in an exponential-like fashion with a 30-s time
constant.  The x-ray emission began roughly simultaneously with the
gamma-ray trigger, but was detectable with the ASM over at least
160 s.  The combined camera detections yield an x-ray position of
R.A. = 18h08m29s, Decl. = +59o18'.0 (equinox 2000.0; 1-sigma
uncertainties of +/- 3'.2 in R.A. and +/- 1'.2 in Decl.).  Optical
observations are urgently needed."


XTE J1755-324
     R. N. Ogley and T. D. C. Ash, Open Univeristy; and R. P.
Fender, Sussex University, report that a search was made on Aug.
18.17-18.69 UT for a radio counterpart to the recently detected x-
ray source XTE J1755-324 (IAUC 6710).  Observations were made using
the Australia Telescope Compact Array at 1384 and 2496 MHz, and no
radio emission was detected down to a level of 0.3 mJy (1384 MHz)
and 0.2 mJy (2496 MHz) within the 1' error box of XTE.  The nearest
source detected was 7' from the reported position of the x-ray
source.  At the time of these observations, XTE J1755-324 had an x-
ray (2-12 keV) flux of about 7 counts/s, measured by the ASM on XTE.


COMET C/1997 P2 (SPACEWATCH)
     Extension to ephemeris on IAUC 6719 (elements MPEC 1997-Q02):

1997 TT     R. A. (2000) Decl.   Delta     r    Elong. Phase    m1
Aug. 20    21 36.76   - 6 30.6   3.197   4.202  172.2    1.9   18.8
     30    21 32.67   - 6 24.0   3.216   4.198  164.6    3.7   18.8
Sept. 9    21 29.19   - 6 19.0   3.261   4.195  154.9    5.8   18.8
     19    21 26.68   - 6 13.9   3.332   4.195  145.0    7.9   18.8
     29    21 25.39   - 6 07.1   3.425   4.196  135.2    9.7   18.9
Oct.  9    21 25.49   - 5 57.5   3.538   4.198  125.6   11.2   19.0
     19    21 27.05   - 5 43.9   3.666   4.203  116.3   12.3   19.1

                      (C) Copyright 1997 CBAT
1997 August 28                 (6726)            Daniel W. E. Green

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