[vsnet-grb-info 12391] GRB 120913B: TAROT La Silla observatory optical photometry
GCN Circulars
gcncirc at capella2.gsfc.nasa.gov
Fri Sep 14 10:16:15 JST 2012
TITLE: GCN CIRCULAR
NUMBER: 13766
SUBJECT: GRB 120913B: TAROT La Silla observatory optical photometry
DATE: 12/09/14 01:16:07 GMT
FROM: Alain Klotz at CESR-CNRS <Alain.Klotz at free.fr>
Klotz A. (IRAP-CNRS-OMP), Gendre B. (ASDC/INAF-OAR),
Boer M. (UNS-CNRS-OCA), Atteia J.L. (IRAP-CNRS-OMP) report:
We continue to observe the afterglow of GRB 120913B
(LaCluyze et al. GCNC 13764). A rapid photometric
analysis gives the following magnitudes:
t0+Mid(s) Rmag
159 16.5
200 16.3
281 15.8
351 15.9
451 16.2
652 16.6
1054 17.0
We measure an optical decay alpha=-1 from
observations after 300s, i.e. after the
optical peak.
Considering the optical decay, optical
predicted magnitudes are:
2012-09-14T00:56 UT R=18.4 (t0+1h)
2012-09-14T01:56 UT R=19.1 (t0+2h)
2012-09-14T02:56 UT R=19.6 (t0+3h)
2012-09-14T03:56 UT R=20.0 (t0+4h)
2012-09-15T00:56 UT R=21.0 (t0+1day)
These predictions can help spectrometry
observations.
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