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Date: Tue, 4 May 93 16:58:13 PDT
From: alex%bkyim.hepnet@Lbl.Gov (ALEX FILIPPENKO, UC BERKELEY, 510-642-1813)
Subject: SN 1993J update
5-4-93
Dear SN 1993J worshipers:
The rate at which the supernova is fading at optical wavelengths
seems to be slowing down, especially in R and I. Indeed, it might
be settling onto a "real" plateau. On the other hand, it is still
possible that the object had a relatively thin hydrogen envelope,
and that its brightness will begin to decline rapidly in the near
future; if so, it may turn into a "Type Ib/Ic" supernova spectro-
scopically, as did SN 1987K --- see Filippenko, 1988, AJ). Please
continue observing with diligence! Optical AND IR photometry are
important if we are to construct a bolometric light curve.
It is especially important to continue low-dispersion optical
spectroscopy throughout the current bright run. Not many telescopes
are equipped with low-dispersion spectrographs at this time, so those
that are can really make a difference. There are interesting features
developing --- such as a double-peaked H-alpha profile!
Ralph A.M.J. Wijers, Princeton University Observatory, has a list of
SN 1993J magnitudes that can be usd by plotting packages that like columns.
Please contact him directly if you would like to receive it. His
e-mail address is rw@astro.Princeton.EDU . Alternatively, the
list is also available via anonymous ftp to astro.princeton.edu .
Login as ftp, password anonymous, and go to subdirectory rw/sn.
You will find two files:
1993j.mag : the magnitude list
1993j.conflict : a list of differences between this list and others,
which should be resolved, as well as some general
remarks about problems with the list.
Ralpha notes that "The most important thing for the near future will
be to get the details of the various sets of comparison stars, and
to try and get all visual observations reduced to the same set
of reference stars. It would be helpful if visual observers
send me the reference stars they used for each of their estimates,
and the magnitudes that these stars have according to their chart."
Below are some notes from others.
Cheers,
Alex Filippenko
******
From Wim van Driel (lvandri@c1.mtk.nao.ac.jp):
Concerns: pre-discovery image/ request for R-band magnitudes of faint stars
We are working on the pre-discovery R-band image we made with the Kiso
Schmidt on March 25.6, from which we estimated an upper limit of about
18 for the supernova. However, after spatially filtering the image to
remove the diffuse emission of the galaxy we have the impression that the
upper limit is considerably lower than 18 in R. The problem in determining
an accurate upper limit is that we do not have reliable magnitudes for faint
stars in M81.
So if someone could provide us with R magnitudes (plus positions) of stars
of about 16th to 20th magnitude in M81, preferably within about 6 arcmin
radius of the supernova, we would be very grateful.
Wim van Driel, Kiso Observatory: lvandri@c1.mtk.nao.ac.jp
*****
From Guy M. Hurst (GMH@ASTROPHYSICS.STARLINK.RUTHERFORD.AC.UK)
Subj: TA sequence for SN 1993J Update
THE ASTRONOMER Electronic Circular No 738 1993 May 03 10.02UT
Ed:Guy M Hurst, 16,Westminster Close, Kempshott Rise, Basingstoke,
Hants, RG22 4PP,England. Telephone/FAX(0256)471074 Int:+44256471074
TELEX: 9312111261 Answerback: TA G TELECOM GOLD: 10074:MIK2885
GMH at UK.AC.RUTHERFORD.STARLINK.ASTROPHYSICS STARLINK: RLSAC::GMH
GMH at UK.AC.CAM.ASTRONOMY.STARLINK STARLINK: CAVAD::GMH
-------------------------------------------------------------------
SUPERNOVA 1993J IN NGC 3031- SEQUENCE
D. Hanzl, N. Copernicus Planetarium, Brno, communicates that
GSC 4383.0384 appears to be variable, first noted visually on Apr.
16 by K. Hornoch at Lelekovice and J. Kysely at Vlasim, and
confirmed photoelectrically by Hanzl as having a maximum at
V = 10.98 +/- 0.05, amplitude about 0.35 mag, and period of
probably < 1 day.
IAUC 5775
Editor:
Star D
The above suspected variable is star D on the sequence of 'The
Astronomer' (assigned magnitude 10.70) and is therefore dropped.
If anyone who has submitted estimates involving 'D' also made
additional estimates involving other comparisons please e-mail
these as soon as possible. This would not only enable us to
re-reduce the estimate but also may enable the value of 'D' to
be determined for that date and time.
Star 1
In addition to assist with reduction of early estimates we have
added GSC 4383.150 to our sequence as star 1 with a magnitude
value of 10.3. This was used extensively by many groups when the
supernova was near maximum. There are two stars of '103' on the
Thompson-Bryan chart. The eastern star is 'C' on the TA sequence
and the newly-introduced star '1' is on the western edge.
On the 'B' format electronic chart issued with E-Circular 722,
the coordinates are X=38, Y=57.
Latest sequence with other identifications. Please only use the
assigned TA values in your reductions.
GSC Corwin Sandage ****TA**** GSC TB Skiff
V B-V Mag B-V *Star Mag* Mag Mag B-V
4383 * *
. 94 9 13.92 0.80 *R 13.92* 13.64 13.9
. 150 *1 10.3 * 9.88 10.3W
. 224 11.85 +1.30 *- * 11.18
. 308 11.78 +0.69 *E 11.78* 11.86 11.8
. 322 A5 15.28 1.01 *Q 15.28* 14.87 15.3
. 340 * * 14.59 14.0 14.95 0.16
. 384 VARIABLE *D - * 10.86 10.7
. 434 12.45 +0.63 *G 12.45* 12.00 12.4 12.43 0.44
. 565 * * 12.33 11.42 0.36
. 574 *L 14.10* 14.51 14.1
. 598 A6 14.99 0.69 *N 14.99* 14.59 15.0
. 633 13 13.78 0.58 *K 13.78* 13.31 13.8
. 738 *B 9.40* 8.68 9.4
. 848 *A 8.90* 7.98 8.9
. 860 19 10.32 0.39 *C 10.32* 9.86 10.3
. 863 * * 12.34 12.88 0.56
. 928 11.90 +0.50 *F 11.90* 11.42 11.9 11.93 0.31
. 935 14 12.89 0.73 *H 12.89* 12.38 12.9
.1023 14.73 +0.46 11 14.77 0.44 *M 14.73* 14.37 14.7
.1031 11.62 +0.53 * * 11.17
.1123 13.65 +0.57 *P 13.65* 13.24 13.6 13.64 0.44
Guy M Hurst
********
From Taichi Kato (tkato@kusastro.kyoto-u.ac.jp)
* SN1993J photometry update
* Updated list of observations obtained by May. 3.
New entries and revisions are marked with "*".
-------------------------------------------------------------------------------
YYYY MM DD.DDD MAGN MS SEQ OBSERVER NOTES SOURCE
-------------------------------------------------------------------------------
1993 04 07.56 11.75 U HC *Zheng, Z.-Y. et al. Xing-Long 60-cm #3 IAUC 5777
1993 04 07.56 12.10 B HC *Zheng, Z.-Y. et al. Xing-Long 60-cm #3 IAUC 5777
1993 04 07.56 11.70 V HC *Zheng, Z.-Y. et al. Xing-Long 60-cm #3 IAUC 5777
1993 04 07.56 11.18 R JHC *Zheng, Z.-Y. et al. Xing-Long 60-cm #3 IAUC 5777
1993 04 07.56 10.93 I JHC *Zheng, Z.-Y. et al. Xing-Long 60-cm #3 IAUC 5777
1993 04 09.61 11.71 U HC *Zheng, Z.-Y. et al. Xing-Long 60-cm #3 IAUC 5777
1993 04 09.61 12.00 B HC *Zheng, Z.-Y. et al. Xing-Long 60-cm #3 IAUC 5777
1993 04 09.61 11.43 V HC *Zheng, Z.-Y. et al. Xing-Long 60-cm #3 IAUC 5777
1993 04 09.61 10.95 R JHC *Zheng, Z.-Y. et al. Xing-Long 60-cm #3 IAUC 5777
1993 04 09.61 10.71 I JHC *Zheng, Z.-Y. et al. Xing-Long 60-cm #3 IAUC 5777
1993 04 10.58 11.63 U HC *Zheng, Z.-Y. et al. Xing-Long 60-cm #3 IAUC 5777
1993 04 10.58 11.77 B HC *Zheng, Z.-Y. et al. Xing-Long 60-cm #3 IAUC 5777
1993 04 10.58 11.31 V HC *Zheng, Z.-Y. et al. Xing-Long 60-cm #3 IAUC 5777
1993 04 10.58 10.85 R JHC *Zheng, Z.-Y. et al. Xing-Long 60-cm #3 IAUC 5777
1993 04 10.58 10.63 I JHC *Zheng, Z.-Y. et al. Xing-Long 60-cm #3 IAUC 5777
1993 04 11.59 11.48 U HC *Zheng, Z.-Y. et al. Xing-Long 60-cm #3 IAUC 5777
1993 04 11.59 11.70 B HC *Zheng, Z.-Y. et al. Xing-Long 60-cm #3 IAUC 5777
1993 04 11.59 11.21 V HC *Zheng, Z.-Y. et al. Xing-Long 60-cm #3 IAUC 5777
1993 04 11.59 10.69 R JHC *Zheng, Z.-Y. et al. Xing-Long 60-cm #3 IAUC 5777
1993 04 11.59 10.53 I JHC *Zheng, Z.-Y. et al. Xing-Long 60-cm #3 IAUC 5777
1993 04 12.64 11.41 U HC *Zheng, Z.-Y. et al. Xing-Long 60-cm #3 IAUC 5777
1993 04 12.64 11.63 B HC *Zheng, Z.-Y. et al. Xing-Long 60-cm #3 IAUC 5777
1993 04 12.64 11.10 V HC *Zheng, Z.-Y. et al. Xing-Long 60-cm #3 IAUC 5777
1993 04 12.64 10.61 R JHC *Zheng, Z.-Y. et al. Xing-Long 60-cm #3 IAUC 5777
1993 04 12.64 10.45 I JHC *Zheng, Z.-Y. et al. Xing-Long 60-cm #3 IAUC 5777
1993 04 13.61 11.33 U HC *Zheng, Z.-Y. et al. Xing-Long 60-cm #3 IAUC 5777
1993 04 13.61 11.51 B HC *Zheng, Z.-Y. et al. Xing-Long 60-cm #3 IAUC 5777
1993 04 13.61 11.06 V HC *Zheng, Z.-Y. et al. Xing-Long 60-cm #3 IAUC 5777
1993 04 13.61 10.57 R JHC *Zheng, Z.-Y. et al. Xing-Long 60-cm #3 IAUC 5777
1993 04 13.61 10.38 I JHC *Zheng, Z.-Y. et al. Xing-Long 60-cm #3 IAUC 5777
1993 04 14.62 11.31 U HC *Zheng, Z.-Y. et al. Xing-Long 60-cm #3 IAUC 5777
1993 04 14.62 11.46 B HC *Zheng, Z.-Y. et al. Xing-Long 60-cm #3 IAUC 5777
1993 04 14.62 10.96 V HC *Zheng, Z.-Y. et al. Xing-Long 60-cm #3 IAUC 5777
1993 04 14.62 10.45 R JHC *Zheng, Z.-Y. et al. Xing-Long 60-cm #3 IAUC 5777
1993 04 14.62 10.28 I JHC *Zheng, Z.-Y. et al. Xing-Long 60-cm #3 IAUC 5777
1993 04 15.469 11.1 mv TB *Sugai, H. 30-cm refl. Mail(kat)
1993 04 15.59 11.33 U HC *Zheng, Z.-Y. et al. Xing-Long 60-cm #3 IAUC 5777
1993 04 15.59 11.43 B HC *Zheng, Z.-Y. et al. Xing-Long 60-cm #3 IAUC 5777
1993 04 15.59 10.90 V HC *Zheng, Z.-Y. et al. Xing-Long 60-cm #3 IAUC 5777
1993 04 15.59 10.43 R JHC *Zheng, Z.-Y. et al. Xing-Long 60-cm #3 IAUC 5777
1993 04 15.59 10.25 I JHC *Zheng, Z.-Y. et al. Xing-Long 60-cm #3 IAUC 5777
1993 04 16.55 11.29 U HC *Zheng, Z.-Y. et al. Xing-Long 60-cm #3 IAUC 5777
1993 04 16.55 11.44 B HC *Zheng, Z.-Y. et al. Xing-Long 60-cm #3 IAUC 5777
1993 04 16.55 10.83 V HC *Zheng, Z.-Y. et al. Xing-Long 60-cm #3 IAUC 5777
1993 04 16.55 10.38 R JHC *Zheng, Z.-Y. et al. Xing-Long 60-cm #3 IAUC 5777
1993 04 16.55 10.21 I JHC *Zheng, Z.-Y. et al. Xing-Long 60-cm #3 IAUC 5777
1993 04 17.55 11.33 U HC *Zheng, Z.-Y. et al. Xing-Long 60-cm #3 IAUC 5777
1993 04 17.55 11.37 B HC *Zheng, Z.-Y. et al. Xing-Long 60-cm #3 IAUC 5777
1993 04 17.55 10.88 V HC *Zheng, Z.-Y. et al. Xing-Long 60-cm #3 IAUC 5777
1993 04 17.55 10.36 R JHC *Zheng, Z.-Y. et al. Xing-Long 60-cm #3 IAUC 5777
1993 04 17.55 10.18 I JHC *Zheng, Z.-Y. et al. Xing-Long 60-cm #3 IAUC 5777
1993 04 18.57 11.37 U HC *Zheng, Z.-Y. et al. Xing-Long 60-cm #3 IAUC 5777
1993 04 18.57 11.46 B HC *Zheng, Z.-Y. et al. Xing-Long 60-cm #3 IAUC 5777
1993 04 18.57 10.85 V HC *Zheng, Z.-Y. et al. Xing-Long 60-cm #3 IAUC 5777
1993 04 18.57 10.36 R JHC *Zheng, Z.-Y. et al. Xing-Long 60-cm #3 IAUC 5777
1993 04 18.57 10.18 I JHC *Zheng, Z.-Y. et al. Xing-Long 60-cm #3 IAUC 5777
1993 04 19.58 11.50 U HC *Zheng, Z.-Y. et al. Xing-Long 60-cm #3 IAUC 5777
1993 04 19.58 11.50 B HC *Zheng, Z.-Y. et al. Xing-Long 60-cm #3 IAUC 5777
1993 04 19.58 10.86 V HC *Zheng, Z.-Y. et al. Xing-Long 60-cm #3 IAUC 5777
1993 04 19.58 10.34 R JHC *Zheng, Z.-Y. et al. Xing-Long 60-cm #3 IAUC 5777
1993 04 19.58 10.17 I JHC *Zheng, Z.-Y. et al. Xing-Long 60-cm #3 IAUC 5777
1993 04 20.212 10.02 J *Smith, J. A. Kitt Peak 1.3-m IAUC 5780
1993 04 20.212 10.02 H *Smith, J. A. Kitt Peak 1.3-m IAUC 5780
1993 04 20.212 9.84 K *Smith, J. A. Kitt Peak 1.3-m IAUC 5780
1993 04 20.55 11.63 U HC *Zheng, Z.-Y. et al. Xing-Long 60-cm #3 IAUC 5777
1993 04 20.55 11.62 B HC *Zheng, Z.-Y. et al. Xing-Long 60-cm #3 IAUC 5777
1993 04 20.55 10.90 V HC *Zheng, Z.-Y. et al. Xing-Long 60-cm #3 IAUC 5777
1993 04 20.55 10.37 R JHC *Zheng, Z.-Y. et al. Xing-Long 60-cm #3 IAUC 5777
1993 04 20.55 10.14 I JHC *Zheng, Z.-Y. et al. Xing-Long 60-cm #3 IAUC 5777
1993 04 21.265 10.05 J *Smith, J. A. Kitt Peak 1.3-m IAUC 5780
1993 04 21.265 10.02 H *Smith, J. A. Kitt Peak 1.3-m IAUC 5780
1993 04 21.265 9.85 K *Smith, J. A. Kitt Peak 1.3-m IAUC 5780
1993 04 21.56 11.79 U HC *Zheng, Z.-Y. et al. Xing-Long 60-cm #3 IAUC 5777
1993 04 21.56 11.78 B HC *Zheng, Z.-Y. et al. Xing-Long 60-cm #3 IAUC 5777
1993 04 21.56 10.95 V HC *Zheng, Z.-Y. et al. Xing-Long 60-cm #3 IAUC 5777
1993 04 21.56 10.40 R JHC *Zheng, Z.-Y. et al. Xing-Long 60-cm #3 IAUC 5777
1993 04 21.56 10.19 I JHC *Zheng, Z.-Y. et al. Xing-Long 60-cm #3 IAUC 5777
1993 04 22.165 10.06 J *Smith, J. A. Kitt Peak 1.3-m IAUC 5780
1993 04 22.165 10.02 H *Smith, J. A. Kitt Peak 1.3-m IAUC 5780
1993 04 22.165 9.87 K *Smith, J. A. Kitt Peak 1.3-m IAUC 5780
1993 04 23.510 11.27:V *Okyudo, M. 60cm refl.+ CCD IAUC 5780
* Nishi-Harima Obs.
1993 04 23.56 12.23 U HC *Zheng, Z.-Y. et al. Xing-Long 60-cm #3 IAUC 5777
1993 04 23.56 12.02 B HC *Zheng, Z.-Y. et al. Xing-Long 60-cm #3 IAUC 5777
1993 04 23.56 11.10 V HC *Zheng, Z.-Y. et al. Xing-Long 60-cm #3 IAUC 5777
1993 04 23.56 10.48 R JHC *Zheng, Z.-Y. et al. Xing-Long 60-cm #3 IAUC 5777
1993 04 23.56 10.27 I JHC *Zheng, Z.-Y. et al. Xing-Long 60-cm #3 IAUC 5777
1993 04 24.145 10.14 J *Smith, J. A. Kitt Peak 1.3-m IAUC 5780
1993 04 24.145 10.04 H *Smith, J. A. Kitt Peak 1.3-m IAUC 5780
1993 04 24.145 9.89 K *Smith, J. A. Kitt Peak 1.3-m IAUC 5780
1993 04 25.246 10.16 J *Smith, J. A. Kitt Peak 1.3-m IAUC 5780
1993 04 25.246 10.09 H *Smith, J. A. Kitt Peak 1.3-m IAUC 5780
1993 04 25.246 9.89 K *Smith, J. A. Kitt Peak 1.3-m IAUC 5780
1993 04 25.620 11.27 V *Kato, M. 60-cm + CCD Mail
1993 04 25.642 10.60 I C *Kato, M. 60-cm + CCD Mail
1993 04 25.719 11.40 V *Okyudo, M. 60cm refl.+ CCD IAUC 5780
* Nishi-Harima Obs.
1993 04 26.483 11.6 mv TB *Takeuchi, T. 12.5-cm refr. Mail(kat)
1993 04 26.583 11.55 V *Okyudo, M. 60cm refl.+ CCD IAUC 5780
* Nishi-Harima Obs.
1993 04 26.740 11.46 V *Okyudo, M. 60cm refl.+ CCD IAUC 5780
* Nishi-Harima Obs.
1993 04 27.609 11.64 V *Okyudo, M. 60cm refl.+ CCD IAUC 5780
* Nishi-Harima Obs.
1993 05 01.444 12.1 mv TB *Takahashi, S. 60-cm refl. Mail(kat)
1993 05 02.878 12.1 mv TA *Poyner, G. 40-cm refl. Mail
-----------------------------------------------------------------------------
*Remarks:
*#3 Original data IAUC 5774; correction IAUC 5777;
* correction by -0.06, -0.05, 0.04, -0.12, -0.21 for U,B,V,R,I respectively
* and the systems were transformed to the Johnsin's. mail (May, 2)
*****
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