Observations of the recurrent M 31 transient XMMU J004215.8+411924 with Swift, Chandra, HST, and Einstein

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Table 1

Journal of observations.

Instrument	Obs	Date	Exposure	Net counts

Einstein HRI	579	1979-01-13	29 ks	29
Chandra ACIS-I	7139	2006-07-31	4 ks	433
Chandra ACIS-I	11279	2010-03-05	4 ks	5
Chandra ACIS-I	11838	2010-05-27	4 ks	279
Swift XRT	0031255012	2010-06-06	4 ks	44
Swift XRT	0031255013	2010-06-09	4 ks	37
Swift XRT	0031255014	2010-06-12	4 ks	24
Swift XRT	0031255015	2010-06-15	1.7 ks	9
Swift XRT	0031255016	2010-06-18	3 ks	6^a
Chandra ACIS-I	11839	2010-06-23	4 ks	27
Swift XRT	0031255018	2010-06-24	4 ks	1^a
Chandra ACIS-I	11840	2010-07-20	4 ks	~0^a

Notes. For each observation we give the instrument, observation number, date, exposure time and number of net source photons.

^(a)

Not a secure detection. Derived luminosities are 3σ upper limits.

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