GCN Circular 37451
David O. Cook (Caltech/IPAC), Rick Ebert (Caltech/IPAC), George Helou (Caltech/IPAC), Joseph M. Mazzarella (Caltech/IPAC), Marion Schmitz (Caltech/IPAC), and Leo Singer (NASA/GSFC)
On behalf of the NASA/IPAC Extragalactic Database (NED) Team.
We spatially cross-matched the LVK S240910ci-4-Update sky localization with the NED Local Volume Sample (NED-LVS; Cook et al. 2023), which is a subset of NED with a redshift or redshift-independent distance less than 1000 Mpc. We find 21074 galaxies within the 90% containment volume, and we list here the top 20 galaxies located in the 90% volume sorted by the joint probability of the 3D localization and the WISE W1 luminosity (an observable proxy for stellar mass). For the full list of galaxies in the 90% volume go to the NED Gravitational Wave Followup service at https://ned.ipac.caltech.edu/uri/NED::GWF/.
The NED-GWF service provides downloadable galaxy lists and visualizations for candidate host galaxies. For each GW alert, these products are automatically generated and made available within minutes to expedite efficient electromagnetic followup observations. The NED top 20 list is sorted by the joint probability of the 3D localization and the WISE W1 luminosity, but users can sort on additional pre-computed prioritization metrics (star formation rate, P_3DP_SFR; and specific star formation rate, P_3DP_sSFR; etc.) which are available via downloading the entire galaxy list inside the event's probability volume (https://ned.ipac.caltech.edu/uri/NED::GWFglist/fits/S240910ci/4).
The NED-GWF service provides downloadable galaxy lists and visualizations for candidate host galaxies. For each GW alert, these products are automatically generated and made available within minutes to expedite efficient electromagnetic followup observations. The NED top 20 list is sorted by the joint probability of the 3D localization and the WISE W1 luminosity, but users can sort on additional pre-computed prioritization metrics (star formation rate, P_3DP_SFR; and specific star formation rate, P_3DP_sSFR; etc.) which are available via downloading the entire galaxy list inside the event's probability volume.
| objname | ra | dec | objtype | DistMpc | DistMpc_unc | m_NUV | m_NUV_unc | m_Ks | m_Ks_unc | m_W1 | m_W1_unc | P_3D | P_3D_LumW1 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| deg | deg | Mpc | mag(AB) | mag | mag | Prob | Prob | ||||||
| WISEA J164409.31-231729.3 | 251.03900 | -23.29122 | G | 749.57 | null | null | null | 13.758 | 0.234 | 9.619 | 0.006 | 1.83e-07 | 8.27e-10 |
| WISEA J163915.56-213504.9 | 249.81471 | -21.58469 | G | 709.57 | null | null | null | 13.096 | 0.159 | 9.098 | 0.006 | 9.01e-08 | 6.05e-10 |
| WISEA J163638.27-214542.4 | 249.15938 | -21.76197 | G | 567.91 | null | null | null | 12.632 | 0.136 | 9.280 | 0.006 | 1.36e-07 | 4.99e-10 |
| WISEA J153550.65-035805.5 | 233.96117 | -3.96828 | G | 663.16 | null | null | null | 13.466 | 0.191 | 10.156 | 0.006 | 1.02e-07 | 2.10e-10 |
| WISEA J162900.97-210059.6 | 247.25408 | -21.01647 | G | 573.91 | null | null | null | 13.818 | 0.228 | 10.467 | 0.006 | 1.30e-07 | 1.61e-10 |
| WISEA J152149.85+035149.1 | 230.45765 | 3.86368 | G | 623.56 | 0.17 | null | null | 13.363 | 0.177 | 9.104 | 0.005 | 3.34e-08 | 1.56e-10 |
| WISEA J152447.08+020820.1 | 231.19621 | 2.13875 | G | 601.36 | 0.10 | null | null | 13.781 | 0.204 | 9.912 | 0.006 | 7.23e-08 | 1.50e-10 |
| WISEA J183519.73-344943.1 | 278.83229 | -34.82897 | G | 508.12 | 0.65 | null | null | 13.055 | 0.175 | 8.734 | 0.006 | 3.17e-08 | 1.39e-10 |
| WISEA J011220.13+774357.3 | 18.08408 | 77.73272 | G | 610.93 | null | null | null | 13.436 | 0.148 | 9.155 | 0.005 | 2.83e-08 | 1.26e-10 |
| WISEA J155309.64-100115.7 | 238.29025 | -10.02103 | G | 595.95 | null | null | null | 13.502 | 0.184 | 10.902 | 0.006 | 1.50e-07 | 1.26e-10 |
| WISEA J183650.82-343757.6 | 279.21167 | -34.63275 | G | 556.83 | null | null | null | 13.146 | 0.176 | 8.992 | 0.006 | 2.89e-08 | 1.20e-10 |
| WISEA J165512.10-252007.7 | 253.80054 | -25.33542 | G | 743.05 | null | null | null | 13.702 | 0.238 | 11.493 | 0.021 | 1.43e-07 | 1.10e-10 |
| WISEA J165757.99-252522.8 | 254.49162 | -25.42308 | G | 695.19 | null | null | null | 13.220 | 0.166 | 11.303 | 0.010 | 1.38e-07 | 1.10e-10 |
| WISEA J152539.59+014654.8 | 231.41497 | 1.78186 | G | 588.73 | 0.21 | null | null | 13.291 | 0.170 | 10.152 | 0.006 | 6.60e-08 | 1.05e-10 |
| WISEA J160123.53-140150.0 | 240.34808 | -14.03058 | G | 688.38 | null | null | null | 13.187 | 0.173 | 11.878 | 0.009 | 2.12e-07 | 9.62e-11 |
| WISEA J145024.06+173433.1 | 222.60029 | 17.57597 | G | 560.68 | 0.11 | null | null | 12.972 | 0.035 | 9.001 | 0.005 | 2.31e-08 | 9.57e-11 |
| WISEA J165558.47-253042.2 | 253.99354 | -25.51117 | G | 749.48 | null | null | null | 13.738 | 0.313 | 11.733 | 0.035 | 1.42e-07 | 8.87e-11 |
| WISEA J154022.30-063237.4 | 235.09296 | -6.54372 | G | 622.65 | null | 21.550 | 0.323 | 13.411 | 0.171 | 11.231 | 0.007 | 1.24e-07 | 8.30e-11 |
| WISEA J154810.27-092639.1 | 237.04271 | -9.44422 | G | 511.44 | null | null | null | 13.468 | 0.187 | 10.701 | 0.006 | 9.32e-08 | 6.88e-11 |
| WISEA J151611.06-001945.6 | 229.04623 | -0.32940 | G | 565.66 | 0.53 | null | null | 13.192 | 0.054 | 9.570 | 0.006 | 2.61e-08 | 6.54e-11 |
Table 1: Top 20 galaxies in NED-LVS that fall in the 90% probability volume for S240910ci sorted by the joint probability of 3D position and WISE W1 luminosity (P_3D*P_LumW1). Galaxy is the NED preferred name. RA and Dec are the Equatorial coordinates in degrees (J2000). Objtype is the object type of the galaxy candidate. Distance is the distance to the galaxy in Mpc. m_NUV and mErr_NUV are the apparent magnitude and error from GALEX. m_Ks and mErr_Ks are the apparent magnitude and error from 2MASS. m_W1 and mErr_W1 are the apparent magnitude and error from AllWISE. P_3D is the probability that the galaxy is in the volume given the distance of GW event. P_3D_LumW1 is the joint probability within the volume weighted by the WISE1 luminosity of the galaxy (P_3D * P_LumW1).