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GCN Circular 14256

Subject
GRB 121128A: optical observations in Mondy observatory
Date
2013-03-04T20:20:57Z (11 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
A.Volnova (SAI MSU), E. Klunko (ISTP), A. Pozanenko (IKI) report on 
behalf of larger GRB follow-up collaboration:

We report revised results of our observations in Mondy observatory (GCNs 
14019, 14024) of the afterglow of GRB 121128A (Oates et al., GCN 14007; 
Japelj et al., GCN 14008). We re-processed data obtained on Nov. 28,29 
and Dec. 02 based on full data set obtained.

Nov. 28
  t_start, filter, exp,      T-t0,   OT,  err
  UT               s         d

  10:27:30 R     4*30+16*60 0.23024 19.79 0.05
  10:46:51 R    10*60       0.24047 19.85 0.04
  10:56:58 R    10*60       0.24751 19.78 0.04
  11:07:06 R    10*60       0.25454 19.96 0.05
  11:17:14 R    8*60+12*40  0.26674 19.95 0.05
  11:42:14 R    25*40       0.28132 20.07 0.05
  11:59:13 R    30*40       0.29429 20.12 0.05
  12:19:36 R    30*40       0.30845 20.06 0.04
  12:39:58 R    30*40       0.32259 20.24 0.05
  13:00:21 R    64*40       0.34488 20.32 0.04

Nov. 29
  t_start, filter, exp,      T-t0,   OT,  UL(3sigma)
  UT               s         d

10:16:58  R      6220      1.27406 n/d  23.3

Dec. 02
  t_start, filter, exp,      T-t0,   OT,  UL(3sigma)
  UT               s         d
10:47:17  R      4920      4.32854 n/d  21.2

The photometry is based on following reference stars

  1442-0304687 20:02:23.58 +54:16:58.9 16.67
  1442-0304744 20:02:29.58 +54:16:57.0 18.66
  1442-0304807 20:02:36.33 +54:17:58.9 18.20
  1443-0305750 20:02:37.10 +54:18:34.6 17.72
  1443-0305710 20:02:32.72 +54:18:46.9 17.25

The combined light curve of our observations (this circular, GCN 14201 
and GCN 14255) can be found at
http://grb.rssi.ru/GRB121128A/GRB121128A_lc2.PNG

Non-filtered photometry of Abastumani observatory (GCN 14201) is 
corrected to the R as d(C-R)=-0.034. One can see non-monotonous behavior 
of the lc between 0.4 -- 0.4 days after trigger, and probable jet brake 
between 0.6 and 1.3 days.
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