[vsnet-grb-info 23248] LIGO/Virgo S190814bv: no counterpart candidates in Nickel/Direct imaging and non-detections of 2019nmd and 2019nme

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  25347
SUBJECT: LIGO/Virgo S190814bv: no counterpart candidates in Nickel/Direct imaging and non-detections of 2019nmd and 2019nme
DATE:    19/08/15 18:26:40 GMT
FROM:    Charles Kilpatrick at UC Santa Cruz  <cdkilpat at ucsc.edu>

C. D. Kilpatrick, J. S. Brown, D. A. Coulter, G. Dimitriadis, R. J. Foley, S. A. Medallon, C. Rojas-Bravo, M. R. Siebert, K. Siellez, C. S. Smith (UCSC)

report on behalf of the One-Meter Two Hemisphere (1M2H) collaboration:

in the process of following up galaxies in the localization region of LIGO/Virgo collaboration event S190814bv (GCN #25324) provided in the updated map of GCN #25333, we observed the following galaxies with the Direct 2k x 2k detector on the 1m Nickel telescope at Lick Observatory, Mt. Hamilton, California on UT 2019 August 15.  Each field was targeted toward a galaxy in the localization region and represents a 6.4 arcmin x 6.4 arcmin pointing centered at the indicated coordinates.  All images were 2 minute r' band exposures, and we indicate the approximate 3-sigma limiting magnitude of each image.  Comparing to PS1 r band images of the same regions, we did not detect any transients to this depth.

Object            RA           Dec          MJD             Limiting Magnitude
LEDA3080215       00:36:02.33  -20:43:20.3  58710.39502     20.3
LEDA835281        00:35:54.70  -20:53:53.5  58710.39831     20.4
LEDA837629        00:41:16.70  -20:43:28.9  58710.40064     20.3
LEDA829060        00:38:23.64  -21:21:54.4  58710.40337     20.3
LEDA840263        00:40:59.47  -20:31:41.2  58710.40575     20.2
LEDA828390        00:42:36.34  -21:24:58.3  58710.40824     20.3
LEDA824045        00:42:38.30  -21:44:54.2  58710.41062     20.3
LEDA823717        00:41:45.22  -21:46:16.3  58710.41345     20.2
LEDA822778        00:42:26.78  -21:50:27.2  58710.41599     20.3
LEDA172750        00:40:30.07  -22:05:42.0  58710.41897     20.2
LEDA818205        00:43:34.03  -22:09:13.3  58710.42163     20.4
LEDA73383         00:39:20.21  -22:05:06.7  58710.42706     20.3
LEDA816845        00:43:06.41  -22:14:40.6  58710.43175     20.2
LEDA828390        00:42:22.94  -21:28:29.6  58710.43416     20.2
LEDA133689        00:44:16.85  -22:19:40.1  58710.43689     20.2
LEDA817925        00:43:33.31  -22:10:14.2  58710.44282     20.4
00430218-2231305  00:43:02.19  -22:31:30.6  58710.44549     20.3
LEDA818175        00:43:23.02  -22:09:11.5  58710.44801     20.3
00512962-2216458  00:51:29.62  -22:16:45.8  58710.45080     20.3
LEDA817340        00:43:42.60  -22:12:33.5  58710.45368     20.3
LEDA820155        00:46:59.40  -22:00:56.9  58710.45629     20.3
LEDA822779        00:45:59.40  -21:50:06.7  58710.45894     20.4
LEDA820466        00:45:16.94  -21:59:40.6  58710.46148     20.4
LEDA828872        00:42:20.18  -21:22:19.9  58710.46386     20.3
LEDA821974        00:48:08.33  -21:53:30.5  58710.46636     20.3
LEDA825694        00:51:51.00  -21:37:09.1  58710.47198     20.4
LEDA826986        00:49:49.08  -21:30:52.9  58710.47496     20.4
LEDA830067        00:48:30.05  -21:16:42.6  58710.47782     20.3

In addition, we observed the fields around DESGW transients (GCN #25336) 2019nmd and 2019nme.  2019nmd was observed in i' band for 10 minutes and 2019nme was observed in i' for 5 minutes.  At the time of observations, we did not detect either transient to the approximate 3-sigma limiting magnitude indicated below.

Object   RA           Dec          MJD             Limiting Magnitude
2019nmd  00:51:35.95  -22:27:02.5  58710.48096     20.6
2019nme  00:50:39.65  -22:12:17.6  58710.49475     20.3

For 2019nmd, our limits are comparable to the discovery magnitude and in the same band as the original report of GCN #25336.  However, for 2019nme our limits are significantly deeper than the discovery report, which suggests that this transient is either extremely rapidly declining in i' band (1 mag in the 5.2 hours between DESGW and Nickel observations), an uncatalogued minor planet, or non-astrophysical in nature.

Please direct all communication related to this circular to Charles Kilpatrick (cdkilpat at ucsc.edu)