GCN Circular 20430

R. Itoh,  Y. Tachibana, Y. Saito, T. Yoshii, T. Fujiwara, Y. Ono,  K.
Morita, K. Saisho,Y. Yatsu, and N. Kawai (Tokyo Tech),
C.-C., Ngeow (National Central University), L. P. Singer (NASA/GSFC),
M. M. Kasliwal (Caltech)

report on behalf of the GROWTH collaboration:

We observed the field of the optical candidate reported by Singer et al.
(LVC GCN 20401
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 ) with the 50cm Japanese telescope at Akeno Observatory
(Japan) and the 40cm Telescope (SLT)  with Apogee CCD at Lulin Observatory
(Taiwan). We obtained the g, V, R and I bands image on 2017-01-09 and
2017-01-10 (UTC). The observed objects are listed below (3-sigma upper
limits). We note that iPTF17fu, iPTF17fs, iPTF17ft, iPTF17fw, iPTF17gr,
iPTF17gv and iPTF17gw contained the host galaxy but
subtraction of host galaxy were not applied.

#Time(UT) exposure[sec] ra[deg.] dec[deg.] V[mag.] V-error Name
2017-01-09T18:13:02 300.0 162.900034 +69.833971 18.99 0.13 iPTF17fs

#Time(UT) exposure[sec] ra[deg.] dec[deg.] g[mag.] g-error R[mag.] R-error
I[mag] I-error Name
2017-01-09T11:40:51.95 660.0 162.900034 +69.833971 >18.7 -- >19.0 -- >18.7
-- iPTF17fs
2017-01-09T16:31:03.65 2580.0 156.366148 +71.757620 16.46 0.07 15.46 0.02
14.97 0.03 iPTF17fw
2017-01-09T15:12:28.36 2640.0 159.042893 +69.146836 >19.1 -- >18.9 -- >18.5
-- iPTF17ge
2017-01-09T19:58:36.97 2040.0 199.058226 +76.521298 19.0 0.2 18.4 0.2 17.9
0.4 iPTF17gs
2017-01-09T12:48:30.17 2340.0 176.227516 +82.619152 16.52 0.07 15.49 0.03
14.87 0.03 iPTF17gv
2017-01-09T18:31:04.09 1380.0 178.409537 +72.864968 17.6 0.2 16.59 0.09
15.89 0.04 iPTF17gw
2017-01-09T19:07:24.90 1560.0 194.925476 +75.016124 19.9 0.2  >19.7 --
>18.7 -- iPTF17hh
2017-01-09T17:31:38.92 1920.0 180.885869 +72.050360 18.7 0.3 18.7 0.4 18.5
0.5 iPTF17hi
2017-01-09T19:48:39.40 480.0 191.763759 +76.839773 19.0 0.2 18.5 0.2 >18.1
-- iPTF17gt
2017-01-09T13:02:59.53 480.0 165.400920 +68.097753 >17.3 -- >18.0 -- >17.4
-- iPTF17hc
2017-01-10T18:52:33.53 1980.0 201.323053 +78.426314 16.23 0.09 15.21 0.03
14.84 0.03 iPTF17ft
2017-01-10T20:41:03.31 300.0 235.823172 +74.750334 18.8 0.3 17.6 0.2 17.0
0.2 iPTF17gm
2017-01-10T20:03:36.84 1920.0 232.045095 +74.611299 19.5 0.4 18.8 0.3 17.0
0.2 iPTF17gn
2017-01-10T19:41:27.53 480.0 195.818782 +80.173138 >18.9 -- >18.5 -- >18.0
-- iPTF17hf
2017-01-10T12:35:41.66 1140.0 192.417627 +80.149750 17.52 0.07 16.14 0.03
15.54 0.03 iPTF17fu
2017-01-10T18:12:54.94 2100.0 193.895770 +79.226903 17.51 0.04 16.22 0.02
15.64 0.02 iPTF17gr
2017-01-10T15:12:41.65 2340.0 194.101611 +78.204729 19.6 0.3 18.6 0.2
iPTF17gu
Observations of this source were taken as part of the GROWTH network (
http://growth.caltech.edu).