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Swift observations of the bright microlensing event TCP J05074264+2447555

ATel #10921; K. Sokolovsky (IAASARS NOA/ASC Lebedev/SAI MSU)
on 2 Nov 2017; 11:39 UT
Credential Certification: Kirill Sokolovsky (kirx@scan.sai.msu.ru)

Subjects: Optical, Ultra-Violet, X-ray, Microlensing Event

Referred to by ATel #: 10923, 10934

Swift observed TCP J05074264+2447555 (ATel #10919) for 1.0ks on 2017-11-01.66 UT. The XRT detected no X-ray source at the position of the transient with an upper limit of 0.0030 +/-0.0017 cts/s. An UV source is detected by the UVOT at the position 05:07:42.69 +24:47:56.3 +/-0.4" J2000 measured with respect to nearby UCAC3 stars. The position is consistent within the uncertainties with the one reported by K. Yoshimoto through the CBAT followup page. The measured UV magnitude UVM2 17.72 +/-0.04 (AB system) compared to the archival GALEX measurement NUV 20.03 +/-0.12 suggests the brightening in the UV is similar to the one observed in the optical band, as expected for a microlensing event.

We thank the Swift team for rapid execution of this ToO observation.

CBAT Transient Object Followup Reports for TCP J05074264+2447555