[vsnet-grb-info 14834] GRB 140423A: ISON-MN early photometry and correction to the GCN circ. 16143

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  16148
SUBJECT: GRB 140423A:  ISON-MN early photometry and correction to the GCN circ. 16143
DATE:    14/04/23 11:01:48 GMT
FROM:    Alexei Pozanenko at IKI, Moscow  <apozanen at iki.rssi.ru>

L. Elenin (KIAM),  A. Volnova (IKI), I. Molotov (KIAM), A. Pozanenko (IKI) 
report on behalf of larger GRB  follow-up collaboration:

After detection of the optical afterglow of GRB 140423A (Elenin et al., GCN 
16143; Kaur et al., GCN 16144; Ferrante et al., GCN 16145) and X-ray 
afterglow (Burrows et al., GCN 16146)   we report initial photometry of our 
first images taken with ISON-NM observatory:

UT start   t-T0              Exp.  Filter   OT
              (mid.,days)    (s)
09:01:18  0.02043        30     Clear   17.11 +/- 0.17
09:06:49  0.02426        30     Clear   17.60 +/- 0.21

The photometry is based on star SDSS J130858.37+494547.9 (assuming R = 
15.418 +/- 0.018).

The finding chart of GRB 140423A afterglow can be found in 
http://grb.rssi.ru/GRB140423A/GRB140423A_ISON-NM_fc.png

Also we report the corect time of observation of the first image in GCN 
16143. It  should be April, 23,  (UT)  09:01:03.
We apologize for the misprint.