Central Bureau for Astronomical Telegrams

IAUC 7225: N Aql 1999; GRB 990712

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                                                  Circular No. 7225
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/iau/cbat.html  ISSN 0081-0304
Phone 617-495-7244/7440/7444 (for emergency use only)


NOVA AQUILAE 1999
     T. Tomov, D. Moro, and U. Munari, Padova and Asiago
Astronomical Observatories, write:  "Spectra (range 390-680 nm; 0.2
nm/pixel) of N Aql 1999 were obtained on July 15.86-15.94 UT with
the Asiago 1.22-m telescope (+ Boller & Chivens CCD spectrograph).
The FWHM of H-alpha, H-beta, H-gamma, H-delta, and H-epsilon
emission lines are 3280, 3320, 3390, 3430, and 3440 km/s, and their
equivalent widths are 80, 27, 8, 7, and 6 nm, respectively.  Strong
Fe II emission lines come from multiplet 42 at 492, 502, and 517 nm
and multiplet 74 at 615, 624, and 645 nm.  Other Fe II multiplets
(37, 38, 48, 49, and 55) appear in emission, too.  No line shows a
convincing P-Cyg profile.  Apart from a possible [O I] 558 nm, no
strong forbidden line has yet appeared.  The 0.25-nm equivalent
width of the interstellar Na I doublet at 589 nm suggests a large
reddening."
     Visual magnitude estimates:  July 14.886 UT, 10.1 (K. Hornoch,
Lelekovice, Czech Republic); 15.12, 10.4 (A. Pereira, Cabo da Roca,
Portugal); 15.924, 10.9 (R. J. Bouma, Groningen, The Netherlands);
15.967, 10.9 (W. C. Souza, Joaquim Egidio, Brazil).


GRB 990712
     G. Bakos, Space Telescope Science Institute (STScI) and
Konkoly Observatory; K. Sahu, STScI; and J. Menzies, South African
Astronomical Observatory (SAAO), on behalf of the PLANET
collaboration; and P. Vreeswijk, University of Amsterdam, and F.
Frontera, Istituto Tecnologie e Studio Radiazioni Extraterrestri,
CNR, Bologna, on behalf of the Amsterdam and BeppoSAX/Bologna GRB
follow-up teams, report:  "The GRB 990712 WFC error circle (IAUC
7721) was observed with the 1-m SAAO telescope at Sutherland on
July 12, 13, and 14.  An R image taken on July 12.82 UT
(integration time 900 s), when compared with the Digitized Sky
Survey (DSS) image, showed a source at R.A. = 22h31m53s.1, Decl. =
-73o24'29" (equinox 2000.0; positional uncertainty 1") that is
absent in the DSS image.  Images taken during the following two
nights showed the source to fade, and this further supports the
identification.  For photometric calibration, the standard stars
F203 and F209 were observed, and the resultant magnitudes for the
object are:  July 12.82, R = 19.4; 13.74, R = 20.9; 13.76, I =
20.5; 14.76, R = 21.2; 14.77, V = 21.9.  A finding chart is
available at http://www.stsci.edu/~ksahu/grb990712.html."

                      (C) Copyright 1999 CBAT
1999 July 16                   (7225)            Daniel W. E. Green

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