The near-infrared counterpart of 4U 1636–53 | Astronomy & Astrophysics (A&A)

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Table 1

New NIR-optical-UV magnitudes of 4U 1636–53.

Filter	λ¹	S/N	——— Magnitude ———			Days²
	(Å)		mean	brightest	faintest

K_S	21590	145	16.14	16.14(12)	16.14(12)	–
J	12350	7	16.65	16.65(22)	16.65(22)	–
v	5468	28	17.94	17.94(6)	17.94(6)	1
b	4392	21	18.67	18.67(8)	18.67(8)	1
u	3465	27–43	17.82	17.63(7)	17.95(8)	5
uw1	2600	10–24	18.35	18.16(9)	18.67(15)	4
um2	2246	7–15	18.95	18.61(13)	19.31(20)	5
uw2	1928	7–34	19.20	18.53(10)	19.61(21)	4

Notes. The Swift UVOT photometry was taken between 2005-02-13 and 2010-06-10.

⁽¹⁾

The central wavelength of the filter in angstroms;

⁽²⁾

the number of dates the source was observed with UVOT.

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