Serendipitous alerts

ABOUT

Welcome to the XMM-Newton serendipitously detected X-ray transient alerts page. You will find the latest transients to be detected by chance in the EPIC field of view, and for which the PI has given prior accord for this information to be made public. Please feel free to follow-up on any of these sources.

13

aug 2025

Coordinates:	23:23:24.0 +58:46:35.5
Time:	14:54:26
Exposure time:	6739 s
Position Error:	0.45"
Flux:	9.6e-13 ± 9.1e-14 erg cm² s^-1
EPIC detection maximum likelihood:	171.8
Hardness ratio:	0.38
Long term variability:	7.4
Simbad:	Unknown ([AR95] 6)
Spectral warning:	False
Alert type:	Low Flux State

13

aug 2025

Coordinates:	23:23:14.3 +58:46:55.7
Time:	14:54:26
Exposure time:	6739 s
Position Error:	0.65"
Flux:	2.6e-13 ± 5.4e-14 erg cm² s^-1
EPIC detection maximum likelihood:	135.9
Hardness ratio:	-0.73
Long term variability:	59.1
Simbad:	Unknown (Gaia DR2 2010477356655102592)
Spectral warning:	True
Alert type:	Low Flux State

09

aug 2025

Coordinates:	02:14:33.7 -00:46:00.6
Time:	15:15:46
Exposure time:	18197 s
Position Error:	0.01"
Flux:	5.6e-11 ± 1.7e-13 erg cm² s^-1
EPIC detection maximum likelihood:	1946678.1
Hardness ratio:	0.07
Long term variability:	15.1
Simbad:	Unknown ([LBS2007] A)
Spectral warning:	False
Alert type:	Past Variability

09

aug 2025

Coordinates:	02:15:08.8 -00:41:30.5
Time:	15:15:46
Exposure time:	18197 s
Position Error:	1.36"
Flux:	3.1e-14 ± 1.6e-14 erg cm² s^-1
EPIC detection maximum likelihood:	34.4
Hardness ratio:	0.36
Long term variability:	5.9
Simbad:	Galaxy (SDSS J021508.80-004131.0)
Spectral warning:	False
Alert type:	Low Flux State