GW trigger S240422ed (‘S240422ed’)

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Raw GW map | Convolved with 2MPZ

Green spots mark XRT fields observed, red spots mark those planned but not yet observed. Click the image for a larger version.

GW map (HEALPix) | GW map (FITS) | ligo-skymap-from-samples_convolved map (HEALPix) | ligo-skymap-from-samples_convolved map (FITS)

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GW details
Trigger Date:	2024-04-22 at 21:35:13.407 UT
Trigger type:	Compact Binary Coalescence
Distance:	188 ± 43 Mpc
Prob_{ContainsNeutronStar}:	1
Prob_EMBright:	0.99
False alarm rate:	3.095e-13 Hz = 1/1.0e+5 yr
GraceDB:	GraceDB
XRT details
First observation:	T₀ + 169.2 min
Fields planned:	99
Fields observed:	102 [Search]
TargetID range:	7033266—7033463
LVK Prob observed	0.049 (raw), 0.20 (conv)
LVK Prob to observe	8.56e-4 (raw), 1.11e-3 (conv)
XRT sources:	240 (239 verified and public).
Candidate afterglows:	0
Possible afterglows:	3
Unlikely afterglows:	229
Known X-ray sources:	8
Source 2322 (6.2″ away).
Externally-detected sources
There are 12 sources. Show.
AT2024hdk: GCN36273	Position not observed.
AT2024hdl: GCN36273	Position not observed.
AT2024hdm: GCN36273	No detection UL=3.99e-2 s^-1
AT2024hdo: GCN36273	No detection UL=1.22e-1 s^-1
AT2024hdp: GCN36273	Position not observed.
AT2024hdq: GCN36273	Position not observed.
AT2024hdr: GCN36273	Position not observed.
EP240426a: GCN36313
J-GEM24a: GCN36333	No detection UL=9.52e-3 s^-1
Mag24a: GCN36267	No detection UL=3.43e-3 s^-1
S240422ed_T202404230829126m213023:	No detection UL=3.21e-3 s^-1
S240422ed_AT2024hdm:	No detection UL=2.30e-2 s^-1

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List of possible host galaxies.

Galaxy search.

All X-ray sources

#	Position	Err ¹	Flag ²	Class ³ (Rank)	Exp (s)	Cat source?	Fdiff (σ)⁴	Near Galaxy?	Near 2MASS	Near SIMBAD	Search /build	Notes
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Notes:

¹ Error is 90% confidence, radius

² G=Good, R=Reasonable, P=Poor (What?)

³ AG = Candidate afterglow, I=Interesting source, U=Uncatalogued X-ray source, K=Known X-ray source.

⁴ For uncatalogued sources this is how many sigma above the historical upper limit the source is, for known sources this is how many sigma above the catalogued flux the source is.