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TCP J05074264+2447555: the new transient (10.8 mag) in Taurus is a microlensing event

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SPK
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TCP J05074264+2447555: the new transient (10.8 mag) in Taurus is a microlensing event

TCP J05074264+2447555

RA 05h07m42.64s, DEC +24°47'55.5" (J2000.0)

2017 Sept. 2.762 UT, 13.0 mag
2017 Oct. 25.688 UT, 11.7 mag
2017 Oct. 31.734 UT, 10.8 mag
(all CCD, unfiltered)

Discoverer: Tadashi Kojima, Gunma-ken, Japan

2017 10 31.734 UT
Discovered by T. Kojima, Gunma-ken, Japan, who found this on three frames taken using Canon EOS 6D + 135-mm f3.2 lens with the limiting mag.= 13.0. Star is visible on 2017 Sept. 2.762 (mag.= 13.0) and on Oct. 25.688 (mag.= 11.7) UT. Also this star is cataloged on USNO-A2 as mag.= B14.7 and R13.6. An image at
http://www.oaa.gr.jp/~oaacs/image/TCPinTau2017.jpg

Follow up-reports:
http://www.cbat.eps.harvard.edu/unconf/followups/J05074264+2447555.html

Clear skies,
Patrick

SPK
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Microlensing event

Sebastian Otero's suggestion of a microlensing event is supported by Ulisse Munari's (INAF Padova) report: "Just taken a spectrum of the star at the provided coordinates. Nothing unusual, normal absorption stellar spectrum." (BAAVSS alert message)

SPK
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High-dispersion spectroscopy by Hiroyuki Maehara (ATel #10919)

High-dispersion spectroscopy of the probable microlensing event TCP J05074264+2447555 (ATel #10919):
http://www.astronomerstelegram.org/?read=10919

SPK
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Swift observations (ATel #10921)

Swift observations of the bright microlensing event TCP J05074264+2447555 (ATel #10921):
http://www.astronomerstelegram.org/?read=10921

SPK
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ASAS-SN confirmation (ATel #10923)

ASAS-SN Confirmation of the Bright Microlensing Event TCP J05074264+2447555 (ATel #10923):
http://www.astronomerstelegram.org/?read=10923

Deconinck Michel
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Sketch and estimation

Thank you Patrick

As always you propose us an interresting observation to do.  And here an exotic one, I like it!

Tonight my best visual estimation despite the lunar presence was 12.4, between 12.0 and 12.6.

Here under a sketch of the field

Michel

File upload: 
SPK
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Follow-up photometry (ATel #10926):

Follow-up Photometry of the Microlensing Event TCP J05074264+2447555 (ATel #10926):
http://www.astronomerstelegram.org/?read=10926

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