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IAUC 6385: 1996Y; GRO J1744-28; 22P

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IAUC number

                                                  Circular No. 6385
Central Bureau for Astronomical Telegrams
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
Phone 617-495-7244/7440/7444 (for emergency use only)

     J. Mueller reports her discovery of an apparent supernova (red
mag about 18.5) at R.A. = 11h21m32s.57, Decl. = +2o53'14".0
(equinox 2000.0), which is 7" west and 13" north of the center of
the host galaxy.  SN 1996Y was found on a IIIa-F plate exposed by
K. M. Rykoski and Mueller with the 1.2-m Oschin Schmidt telescope
on Apr. 10 UT in the course of the second Palomar Sky Survey.  I.
N. Reid reports that no object appears at the position on a Sky
Survey IIIa-F plate taken on 1991 Mar. 17.  A spectrum obtained on
Apr. 19 by S. G. Djorgovski and R. Gal at the 5-m Hale telescope (+
double spectrograph) suggests that this is indeed a supernova.
     A. V. Filippenko, University of California at Berkeley,
reports that inspection of a CCD spectrum (range 467-750 nm,
resolution 0.7 nm) obtained by M. Eracleous and D. C. Leonard (also
of Berkeley) on Apr. 21 UT with the 3-m Shane reflector at Lick
Observatory shows that the object is a supernova.  The spectral
type and phase are uncertain pending calibration of the data.

GRO J1744-28
     A. B. Giles, NASA Goddard Space Flight Center and Universities
Space Research Association, and the PCA instrument team report:
"The PCA experiment on RXTE has now observed the galactic-center
transient GRO J1744-28 (cf. IAUC 6291) on 29 occasions.  The source
behavior continues as reported before (IAUC 6338), with no sign of
the large bursts ceasing.  On Apr. 19, the nonburst flux was about
225 mCrab (2-60 keV) or about 11 percent of its late-Jan. level.
The rate of decline of the nonburst flux has decreased a little,
but the flux has followed a smooth decrease given by  flux(mCrab)
about 2592 - 22D, where D is the day number in 1996.  If the
present trend were to continue, the nonburst flux would be close to
PCA background levels by early May.  The decline in the integrated
burst flux has continued to lag behind that for the nonburst flux,
and a linear projection places it near zero in late May."

     Total visual magnitude estimates (cf. IAUC 6357):  Apr. 18.18
UT, 10.1 (J. M. Trigo, Castellon, Spain, 0.18-m reflector); 20.07,
10.2 (K. Hornoch, Lelekovice, Czech Republic, 0.35-m reflector).

                      (C) Copyright 1996 CBAT
1996 April 21                  (6385)            Daniel W. E. Green

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