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.

12

sep 2025

Coordinates:	13:58:09.7 -64:44:04.4
Time:	13:54:25
Exposure time:	11377 s
Position Error:	0.45"
Flux:	1.8e-13 ± 1.4e-14 erg cm² s^-1
EPIC detection maximum likelihood:	920.9
Hardness ratio:	0.68
Long term variability:	1756.9
Simbad:	Unknown (V* BW Cir)
Spectral warning:	False
Alert type:	Past Variability

11

sep 2025

Coordinates:	18:18:41.3 -25:15:56.6
Time:	03:40:10
Exposure time:	40607 s
Position Error:	0.57"
Flux:	2.7e-13 ± 4.6e-14 erg cm² s^-1
EPIC detection maximum likelihood:	377.1
Hardness ratio:	0.57
Long term variability:	8.0
Simbad:	Not in Simbad
Spectral warning:	False
Alert type:	High Flux State

05

sep 2025

Coordinates:	13:58:09.7 -64:44:06.9
Time:	10:14:14
Exposure time:	12007 s
Position Error:	0.50"
Flux:	1.4e-13 ± 1.4e-14 erg cm² s^-1
EPIC detection maximum likelihood:	445.1
Hardness ratio:	0.76
Long term variability:	2266.9
Simbad:	Unknown (V* BW Cir)
Spectral warning:	False
Alert type:	Past Variability

01

sep 2025

Coordinates:	15:15:54.1 +56:25:50.0
Time:	05:55:12
Exposure time:	33095 s
Position Error:	1.06"
Flux:	1.0e-14 ± 3.9e-15 erg cm² s^-1
EPIC detection maximum likelihood:	84.3
Hardness ratio:	-0.61
Long term variability:	89.4
Simbad:	Unknown (SDSS J151553.97+562549.9)
Spectral warning:	True
Alert type:	Past Variability