[vsnet-alert 21611] PNV J05580574-0011155: new transient (12 mag) in Orion

Wed Nov 22 05:19:44 JST 2017

PNV J05580574-0011155  (UG:)

RA 05h58m05.74s, DEC -00°11'15.5" (J2000.0)
2017 11 21.6305 UT, 11.7 mag (CCD, unfiltered)
Discoverer: Tadashi Kojima, Gunma-ken, Japan

"2017 11 21.630 UT
Discovered by T. Kojima, Gunma-ken, Japan, who found
this on three frames taken by Canon EOS 6D + 135-mm
f/3.2 lens under the limiting mag.= 13s and confirmed
this (mag.= 12.2) taken on 2017 Nov. 21.651 UT using
200-mm f/3.2 lens. Nothing is visible at this location
on a frame taken on 2017 Nov. 19.609 UT. There is a
star (mag.=17.3, 05 58 05.94, -00 11 16.4) on USNO-A2."

Follow-up reports:
http://tamkin1.eps.harvard.edu/unconf/followups/J05580574-0011155.html

ASAS-SN Sky Patrol observations
(Shappee et al., 2014ApJ...788...48S and
Kochanek et al., 2017PASP..129j4502K):
PNVJ05580574-0011155 20171115.189 <16.36V ASN
PNVJ05580574-0011155 20171117.268 <16.34V ASN
PNVJ05580574-0011155 20171120.493  13.13V ASN
PNVJ05580574-0011155 20171121.526  12.57V ASN

A blue Gaia DR1 source (G= 17.82 mag) is 2" from
the reported position of this transient.
PNV J05580574-0011155 is possibly a dwarf nova
outburst with an amplitude of at least 6 magnitudes.

Time-resolved photometry, spectroscopy, and precise
astrometry are urgently required.

Clear skies,
Patrick