LIGO/Virgo S191213g: No counterpart candidate in the NOWT observations
Abstract
We observed the high-probability localization region of the LIGO/Virgo gravitational wave trigger S191216ap (GCN #26454) that can be reached by the Nanshan One-meter Wide field Telescope (NOWT) with the FOV of 1.3x1.3 deg^2. Observations started at 11:57:05 UT and ended at 15:19:31 UT on 2019-12-17 in R-band. Typical limiting depth is of ~19.0 mag, and 60 sec for each exposure. Listed below are the center coordinates of each exposure: 21:12:36.864000 +29:36:00.000000 21:18:35.424000 +29:36:00.000000 21:06:33.984000 +30:54:00.000000 21:18:40.608000 +30:54:00.000000 21:06:28.800000 +32:12:00.000000 21:12:36.864000 +32:12:00.000000 21:18:45.792000 +32:12:00.000000 21:12:19.584000 +25:42:00.000000 21:18:05.184000 +25:42:00.000000 21:23:51.648000 +25:42:00.000000 21:12:15.264000 +27:00:00.000000 21:18:05.184000 +27:00:00.000000 21:18:05.184000 +28:18:00.000000 21:23:59.424000 +28:18:00.000000 20:52:44.544000 +37:24:00.000000 21:05:50.784000 +37:24:00.000000 20:52:37.632000 +38:42:00.000000 21:05:57.696000 +38:42:00.000000 20:52:30.720000 +40:00:00.000000 20:59:17.664000 +40:00:00.000000 21:06:04.608000 +40:00:00.000000 21:06:22.752000 +21:48:00.000000 21:17:34.944000 +21:48:00.000000 21:06:18.432000 +23:06:00.000000 21:11:58.848000 +23:06:00.000000 21:06:15.840000 +24:24:00.000000 21:11:58.848000 +24:24:00.000000 21:17:40.992000 +24:24:00.000000 20:43:26.400000 +41:18:00.000000 20:50:21.984000 +41:18:00.000000 20:57:17.568000 +41:18:00.000000 20:43:17.760000 +42:36:00.000000 20:50:21.984000 +42:36:00.000000 20:57:25.344000 +42:36:00.000000 20:43:08.256000 +43:54:00.000000 20:50:21.984000 +43:54:00.000000 20:57:34.848000 +43:54:00.000000 20:47:35.232000 +33:30:00.000000 20:53:50.208000 +33:30:00.000000 21:00:04.320000 +33:30:00.000000 21:00:10.368000 +34:48:00.000000 20:47:24.864000 +36:06:00.000000 20:53:50.208000 +36:06:00.000000 21:00:16.416000 +36:06:00.000000 21:12:18.720000 +14:00:00.000000 21:17:40.992000 +14:00:00.000000 21:23:01.536000 +14:00:00.000000 21:12:16.992000 +15:18:00.000000 21:17:40.992000 +15:18:00.000000 21:23:03.264000 +15:18:00.000000 21:12:14.400000 +16:36:00.000000 21:23:05.856000 +16:36:00.000000 21:12:50.688000 +33:30:00.000000 21:19:04.800000 +33:30:00.000000 21:06:30.528000 +34:48:00.000000 21:12:50.688000 +34:48:00.000000 21:19:09.984000 +34:48:00.000000 21:06:23.616000 +36:06:00.000000 21:12:50.688000 +36:06:00.000000 21:06:28.800000 +17:54:00.000000 21:11:56.256000 +17:54:00.000000 21:17:23.712000 +17:54:00.000000 21:06:25.344000 +19:12:00.000000 21:11:56.256000 +19:12:00.000000 21:06:22.752000 +20:30:00.000000 21:22:59.808000 +17:54:00.000000 21:11:56.256000 +20:30:00.000000 21:28:27.264000 +17:54:00.000000 No credible counterpart candidate was identified in the above fields. In addition, we also imaged the localization region of the HAWC gamma-ray counterpart candidate (GCN #26472) during the searching, which is inside the localization region of the IceCube neutrino counterpart candidate (GCN #26460). Four out of nine GLADE galaxies were covered, as follows: | RAJ2000 | DEJ2000 | Dist | r_SDSS | r_NOWT | | ---------- | --------- | ----- |-------- | ---------- | | 323.482422 | +5.279632 | 274.4 | 16.50 | 16.52 | | 323.056030 | +4.832057 | 219.1 | 15.83 | 15.84 | | 323.173767 | +4.467985 | 292.5 | 16.10 | 16.20 | | 323.034882 | +4.482058 | 340.7 | 16.24 | 16.13 | All NOWT measurements are consistent with the SDSS values. Any significant optical transient within these galaxies can be ruled out. Furthermore, we imaged the HAWC region again, started at 13:09:43.0 UT on 2019-12-18, with 200 s for each exposure in R-band. Our results are as follows: | RAJ2000 | DEJ2000 | Dist | r_SDSS | r_NOWT | | ---------- | --------- | ----- |-------- | ---------- | | 323.482422 | +5.279632 | 274.4 | 16.50 | 16.51 | | 323.056030 | +4.832057 | 219.1 | 15.83 | 15.85 | | 322.921936 | +5.503483 | 232.2 | 15.57 | 15.60 | | 322.838806 | +5.255421 | 179.3 | 15.41 | 15.65 | | 322.821228 | +5.553754 | 338.7 | 15.83 | 15.70 | | 322.749084 | +5.108610 | 330.8 | 15.94 | 15.90 | | 323.173767 | +4.467985 | 292.5 | 16.10 | 16.20 | | 322.906006 | +5.850705 | 323.1 | 16.84 | 16.87 | | 323.034882 | +4.482058 | 340.7 | 16.24 | 16.12 | Again the NOWT measurements are consistent with the SDSS values. Any significant optical transient within these galaxies can be ruled out.
- Publication:
-
GRB Coordinates Network
- Pub Date:
- December 2019
- Bibcode:
- 2019GCN.26488....1Z