GCN Circular 26487
Subject
LIGO/Virgo S191216ap: No candidates found in CHES observations of HAWC error region
Date
2019-12-18T17:47:27Z (4 years ago)
From
Tianrui Sun at Purple Mountain Obs,CAS <trsun@pmo.ac.cn>
Tianrui Sun, Chen Zhang, Yiding Ping, Xuefeng Wu.(PMO).
We observed the corrected list of galaxies coincident with LIGO/Virgo and HAWC positions by Leo Singer (GCN 26479).
The observation used the 80cm telescope with the FOV of 2x2 deg^2 of the CHanging Event Survey at the YaoAn observation station(101.1811E, 25.528N) in Yunnan Province, China.
Our observations started at 12:04:04UT and ends at 12:55:05UT Dec 18, 2019, with 11 exposure 60 seconds in white filter.
Our results for these galaxies:
| RA | DEC | Mag(White) | SDSS(r) |
| 323.482422 | 5.279632 | 16.42 | 16.50 |
| 323.056030 | 4.832057 | 15.94 | 15.83 |
| 322.921936 | 5.503483 | 15.70 | 15.57 |
| 322.838806 | 5.255421 | 15.60 | 15.41 |
| 322.821228 | 5.553754 | 15.64 | 15.83 |
| 323.173767 | 4.467985 | 16.09 | 16.10 |
| 322.906006 | 5.850705 | 16.69 | 16.84 |
| 323.034882 | 4.482058 | 16.27 | 16.24 |
And the observations of CHES:
Date-obs RA DEC MAG FWHM
2019-12-18T12:04:04 323.1053 5.3952 18.07 3.67
2019-12-18T12:07:48 323.6028 6.0834 17.92 4.18
2019-12-18T12:19:03 323.1023 6.0505 18.08 3.61
2019-12-18T12:20:11 323.1023 6.0507 18.05 3.71
2019-12-18T12:21:26 323.2811 4.3005 17.98 3.83
2019-12-18T12:23:49 323.1022 6.0512 18.02 3.68
2019-12-18T12:24:57 323.1023 6.0515 18.03 3.68
2019-12-18T12:51:43 323.4745 5.3269 17.94 3.87
2019-12-18T12:53:58 323.4746 5.3273 17.91 3.96
2019-12-18T12:55:05 323.4746 5.3273 17.90 3.96
2019-12-18T12:09:03 323.7238 5.8421 17.43 5.50
We did not detect any candidate source related to these galaxies in 5 sigma limit at 18.86 (median combined) generated from G band in Gaia DR2.