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GCN Circular 2218

Subject

GRB030429, refiend optical brightness

Date

2003-05-08T11:40:46Z (21 years ago)

From

Vasilij Rumjantsev at CrAO <rum@crao.crimea.ua>

V.Rumyantsev (CrAO), V.Biryukov (SAI, MSU), A.Pozanenko (IKI) report:

We have performed PSF analysis of combined  image of the OT found by A.
Gilmore (GCN 2184Not found
 
 
). The unfiltered image was obtained on Apr. 29 between
(UT) 18:19 and 20:57 (GCN 2190Not found
 
 
). Based on field photometry (R-band) by
A.Henden (GCN 2214Not found
 
 
) we estimate brightness of the OT:

Mid.Time     exposure  mag (Unfiltered)
  (UT)         sec

Apr.29.820   39x120    20.20 +/-0.15

This brightness estimation is consistent with OT decay slope ~ 1 reported by
J.Fynbo (GCN 2185Not found
 
 
).

(We gratefully acknowledge the notion of J.Fynbo regarding the slope decay
reported in our GCN 2190Not found
 
 
. Due to typo the slope decay was erroneously
calculated as 2)