2025ApJ...990L..46H

Query : 2025ApJ...990L..46H

2025ApJ...990L..46H - Astrophys. J., 990, L46 (2025/September-2)

Kilonova Constraints for the LIGO/Virgo/KAGRA Neutron Star Merger Candidate S250206dm: GW-MMADS Observations.

HU L., CABRERA T., PALMESE A., FREEBURN J., BULLA M., ANDREONI I., HALL X.J., O'CONNOR B., AMSELLEM A., BOM C.R., BUSMANN M., FABA J., GASSERT J., KALABALIK S., KUNNUMKAI K., GRUEN D., SANTANA-SILVA L., SANTOS A., AHUMADA T., CARNEY J., COUGHLIN M.W., CHEN X., FORD K.E.S., HOLZ D.E., KASLIWAL M.M., MAGANA HERNANDEZ I., MIHALENKO C., PERNA R., RIFFESER A., RIES C., SCHNAPPINGER L., SCHMIDT M., SOMMER J., TEAGUE S., VEGA P., VOLCHANSKY O., WANG L. and ZHANG Y.

Abstract (from CDS):

Gravitational-wave (GW) neutron star mergers with an associated electromagnetic counterpart constitute powerful probes of binary evolution, the production sites of heavy elements, general relativity, and the expansion of the Universe. Only a handful of candidate GW binary mergers during the fourth LIGO/Virgo/KAGRA observing run (O4) so far are believed to include a neutron star. We present optical-near-infrared follow-up observations of the candidate neutron star-black hole GW merger S250206dm. This is the first high-significance mass-gap neutron star-black hole candidate observed by multiple GW detectors (thus having a significantly smaller sky localization than one-detector events), offering the first opportunity to effectively follow up a GW event of this kind. Our GW MultiMessenger Astronomy DECam Survey (GW-MMADS) campaign consisted of a wide-field search using the Dark Energy Camera (DECam) and T80-South (T80S), as well as galaxy-targeted observations using the Southern Astrophysical Research (SOAR) imager and the Fraunhofer Telescope at Wendelstein Observatory. No viable kilonova counterpart was found in our observations. We use our observation depths to place competitive constraints on kilonova models similar to or brighter than the GW170817 kilonova AT 2017gfo within our observed fields, ruling out 100% of such models with SOAR galaxy-targeted observations and ∼43% (48%) with DECam (DECam and T80S).

Abstract Copyright: © 2025. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Gravitational wave astronomy - Transient detection

Simbad objects: 43

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Number of rows : 43
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 GrW 190814 GWE 00 55.8 -27 05           ~ 433 0
2 AT 2025baz ev 02 19 26.606 +47 32 50.03           ~ 1 0
3 GrW 170817 GWE 13 09 48.0850 -23 22 53.343           ~ 2683 0
4 AT 2025fso ev 15 30 50.471 -70 27 21.71           ~ 1 0
5 AT 2025bmy ev 15 42 36.998 -69 36 49.68           ~ 1 0
6 AT 2025fsx ev 15 43 23.678 -68 44 52.20           ~ 1 0
7 AT 2025bnv ev 15 43 42.245 -67 40 57.24           ~ 1 0
8 AT 2025fsr ev 15 44 27.414 -68 10 13.71           ~ 1 0
9 AT 2025fsw ev 15 47 15.514 -67 28 05.63           ~ 1 0
10 AT 2025bnb ev 15 50 13.027 -70 19 04.55           ~ 1 0
11 AT 2025fsp ev 15 50 54.916 -70 26 25.36           ~ 1 0
12 AT 2025bnp ev 15 52 22.215 -70 04 43.09           ~ 1 0
13 AT 2025fsq ev 15 57 15.751 -67 45 22.51           ~ 1 0
14 AT 2025bmx ev 15 57 20.452 -68 40 02.45           ~ 1 0
15 AT 2025bni ev 15 59 51.035 -66 55 46.98           ~ 1 0
16 AT 2025bnj ev 15 59 51.035 -66 55 46.98           ~ 1 0
17 AT 2025fss ev 16 01 18.286 -70 59 41.11           ~ 1 0
18 AT 2025btj ev 16 06 31.802 -66 57 35.17           ~ 1 0
19 AT 2025btc ev 16 06 40.963 -70 59 27.85           ~ 1 0
20 AT 2024aexy ev 16 07 47.090 -67 06 08.53           ~ 1 0
21 AT 2025bno ev 16 10 47.634 -68 28 13.60           ~ 1 0
22 AT 2025fta ev 16 11 52.147 -70 52 38.42           ~ 1 0
23 AT 2025bmw ev 16 18 12.675 -71 56 17.54           ~ 1 0
24 AT 2025bnm ev 16 22 52.167 -69 01 23.90           ~ 1 0
25 AT 2025fsy ev 16 26 53.139 -70 00 47.12           ~ 1 0
26 AT 2025bms ev 16 28 24.371 -70 48 58.07           ~ 1 0
27 AT 2025fsu ev 16 28 42.919 -71 20 20.52           ~ 1 0
28 AT 2025ber ev 16 31 50.400 -69 31 44.29           ~ 1 0
29 AT 2025fsz ev 16 32 30.688 -68 42 58.72           ~ 1 0
30 AT 2025bnh ev 16 32 38.208 -68 31 02.93           ~ 1 0
31 AT 2025fst ev 16 32 39.719 -69 37 24.35           ~ 1 0
32 AT 2025bnt ev 16 33 49.467 -70 02 56.98           ~ 1 0
33 AT 2025bmz ev 16 40 26.432 -66 46 25.88           ~ 1 0
34 AT 2025bts ev 16 45 09.071 -71 31 23.22           ~ 1 0
35 AT 2025fsv ev 16 48 20.905 -67 14 02.13           ~ 1 0
36 AT 2025me ev 16 49 43.550 -70 23 33.70           ~ 1 0
37 AT 2025bnu ev 16 51 27.602 -69 06 28.59           ~ 1 0
38 AT 2025bth ev 16 52 03.706 -68 14 22.38           ~ 1 0
39 AT 2025bns ev 16 52 25.986 -69 04 18.74           ~ 1 0
40 AT 2025btr ev 16 58 02.834 -68 26 49.45           ~ 1 0
41 AT 2025bnc ev 17 05 02.588 -69 52 25.77           ~ 1 0
42 GrW 230529 181500 GWE ~ ~           ~ 45 0
43 GRB 190425 GWE ~ ~           ~ 438 0

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