GCN Circular 19540
Subject
LIGO/Virgo G211117/GW151226: serendipitous XMM-Newton slew observations
Date
2016-06-16T19:31:59Z (9 years ago)
From
Eleonora Troja at GSFC <eleonora.troja@nasa.gov>
A. M. Read (U. Leicester), A. Tiengo (IUSS Pavia), R. Salvaterra
(INAF-IASF Milano), E. Troja (NASA/GSFC), R. D. Saxton (ESAC) report:
We analyzed the XMM-Newton slews made in the two weeks after the
LIGO/Virgo G211117 / GW151226 event. Five slews intercept the BAYESTAR
localization map in this period of time for a total coverage of about 26
square degrees:
Obs ID | date | T-T_GW |coverage of localization map
9294000002 | 2015-12-28 | 2.7 d | 3 deg2
9294300002 | 2016-01-03 | 8.7 d | 4 deg2
9294400002 | 2016-01-06 | 11.6 d | 2 deg2
9294500002 | 2016-01-08 | 13.6 d | 2 deg2
9294600002 | 2016-01-10 | 15.5 d | 15 deg2
For each dataset (EPIC pn data with the Medium filter) we performed the
source detection following the method described in Troja et al. 2016
(ApJ, 822, L8).
Typical sensitivity limits of slew observations are ~6e-13 ergs cm-2 s-1
in the 0.2-2 keV band and ~4e-12 ergs cm-2 s-1 in the 2-12 keV band. The
list of the most significant 0.2-12 keV band detections (DET_ML>12) in
each slew intersecting the GW151226 localization map with no counterpart
within 30 arcsec in the ROSAT All Sky Survey (Boller et al. 2016, A&A
588, A103) is reported below. The flux and counts are computed in the
0.2-12 keV energy band.
----------
Revolution 2940, Observation ID 9294000002
RA (deg) DEC (deg) POS_ERR (") CTS CTS_ERR DET_ML EXPOSURE (s)
FLUX (ergs cm-1 s-1)
27.3262 -1.1849 4.1 6.2 2.6 20.1
12.0 5.2e-12
----------
Revolution 2943, Observation ID 9294300002
RA (deg) DEC (deg) POS_ERR (") CTS CTS_ERR DET_ML EXPOSURE (s)
FLUX (ergs cm-1 s-1)
15.6690 -20.0254 3.3 6.6 2.8 18.7
7.8 8.5e-12
14.6309 -17.6256 4.7 4.8 2.4 12.9
3.3 1.4e-11
----------
Revolution 2944, Observation ID 9294400002
RA (deg) DEC (deg) POS_ERR (") CTS CTS_ERR DET_ML EXPOSURE (s)
FLUX (ergs cm-1 s-1) Notes
186.5515 5.5650 5.1 5.0 2.4 14.8
9.4 5.3e-12 Detected also in Revolution 2945
186.7524 6.0297 3.5 4.8 2.3 17.9
11.3 4.2e-12
186.2499 5.0154 4.5 4.7 2.3 13.7
10.8 4.3e-12
185.0333 2.4117 4.2 7.8 3.0 20.0
6.2 1.2e-11
----------
Revolution 2945, Observation ID 9294500002
RA (deg) DEC (deg) POS_ERR (") CTS CTS_ERR DET_ML EXPOSURE (s)
FLUX (ergs cm-1 s-1) Notes
186.5545 5.5635 3.3 8.6 3.0 34.1
8.8 9.8e-12 Detected also in Revolution 2944
186.9961 6.5894 3.6 4.5 2.2 18.6
13.4 3.3e-12
186.6783 5.9833 5.2 5.5 2.5 16.8
12.0 4.5e-12
185.7506 3.7284 5.4 4.4 2.2 14.4
10.3 4.3e-12
----------
Revolution 2946, Observation ID 92946 00002
RA (deg) DEC (deg) POS_ERR (") CTS CTS_ERR DET_ML EXPOSURE
(s) FLUX (ergs cm-1 s-1)
187.2622 7.6581 4.5 8.2 3.2 12.4
5.8 1.4e-11
192.9292 -2.5083 4.9 5.7 2.6 15.4
5.5 1.0e-11
201.3687 -17.3449 8.7 4.9 2.3 12.5
8.0 6.2e-12