Подтвержденно - таки сверхновая.
AAVSO Alert Notice 363
Supernova SN 2007sr in NGC 4038
December 20, 2007
Further to CBETs #1172 (Drake et al.; Daniel W.E. Green,
editor), #1173 (Naito et al.), and #1174 (Umbriaco et
al.), the optical transient in NGC 4038 discussed in
AAVSO Special Notice #84 has been identified as a
supernova of Type Ia, and given the name SN 2007sr.
Umbriaco et al. have determined the supernova is a few
days past maximum light based upon spectroscopic
template fitting.
The supernova was at magnitude 12.9 on 2007 December
18.53 UT (JD 2454453.03; Drake et al., CBET #1172).
Subsequent multiband photometry confirms this
detection: B=13.20, V=12.85, R=12.80 (all accurate to
+/- 0.05 magnitudes) on Dec 19.42 (JD 2454453.92;
Guido & Sostero, CBET #1172); mag=12.9 on Dec 19.52
(JD 2454454.02; Li, CBET #1172); B=13.42, V=12.86
on Dec 19.8 (JD 2454454.3; Naito et al., CBET #1173);
B=12.83, V=13.03, R=12.99 on Dec 20.47 (JD
2454454.97; Nicholson, BAAVSS-Alert).
Supernova 2007sr is located at the following coordinates:
RA: 12:01:52.80 , Dec: -18:58:21.7 (J2000)
A comparison star sequence for this supernova has now been added
to VSP, and charts of the field may be plotted online:
http://www.aavso.org/observing/charts/vsp/It is advisable to check the "Use DSS Image" option so that
NGC 4038-4039 is included on the chart.
Please submit observations to the AAVSO with the name
"SN 2007SR" (AAVSO 1156-18C).
