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GCN Circular 16148

GRB 140423A: ISON-MN early photometry and correction to the GCN circ. 16143
2014-04-23T11:01:48Z (10 years ago)
Alexei Pozanenko at IKI, Moscow <>
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

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.
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