GCN Circular 15776
Subject
GRB 140129B: MASTER OT early light curve
Date
2014-01-30T08:54:54Z (11 years ago)
From
Vladimir Lipunov at Moscow State U/Krylov Obs <gcncirc@observ.inetcomm.ru>
V.A.Poleshchuk, O.Gres, K.Ivanov, S.Yazev, N.M.Budnev, O.Chuvalaev,
Irkutsk State University
D.Denisenko, E. Gorbovskoy, V. Lipunov,
D.Kuvshinov, N.Tyurina, N.Shatskiy, P.Balanutsa,
A.Kuznetsov, V.Kornilov, V.V.Chazov
Lomonosov Moscow State University, Sternberg Astronomical Institute
V.Yurkov, Yu.Sergienko, D.Varda, E.Sinyakov
Blagoveschensk Educational State University, Blagoveschensk
V.Krushinski, I.Zalozhnih, A. Popov
Ural Federal University, Kourovka
A. Tlatov, A.V. Parhomenko, D. Dormidontov, V.Sennik
Kislovodsk Solar Station of the Pulkovo Observatory
Hugo Levato and Carlos Saffe
Instituto de Ciencias Astronomicas, de la Tierra y del Espacio (ICATE)
Claudio Mallamaci, Carlos Lopez and Federico Podest
Observatorio Astronomico Felix Aguilar (OAFA)
MASTER II robotic telescope (MASTER-Net: http://observ.pereplet.ru)
located
in Tunka was pointed to the GRB140129B 78 sec after notice time and 105
sec after trigger time at 2014-01-29 12:52:54 UT (Bernardini et al., GCN
15765).
Such a long pointing time is due to internal mount pointing error under
strong Siberian frost, which was automatically solved. A set of images
with increasing exposures was obtained with the field at zenith distance
75 deg and setting. On our first (20s exposure) image we found optical
transient at the SWIFT optical transient position.
The unfiltered magnitude is about ~14m (Ivanov et al., GCN 15766).
Our coordinates measured from the combination of 7 images are
coincident with Swift UVOT position taking into account the error box
reported by Bernardini et al., GCN 15765 and Swift-XRT position (Goad et
al., GCN 15770):
R.A. Dec. Err
21 47 01.71 +26 12 22.8 +/-0.5 arcsec
The object is visible on 6 images, gradually fading below the detection
limit on the 7th image. The results of our photometry are given in table
below:
T_start T-T_trig Tm-T_trig Exp,s Elevation Mag
----------------------------------------------------
12:52:54 105 115 20 15.5 14.4
12:54:03 174 189 30 15.3 15.4
12:55:28 259 284 50 15.1 15.9
12:57:15 366 401 70 14.9 16.2
12:59:19 490 540 100 14.6 17.0
13:02:11 662 727 130 14.2 17.3
13:05:28 859 944 170 13.7 17.7
13:09:21 1091 1181 180 12.7 18.0
13:13:20 1330 1540 360 11.6 <18.4 # coadd 2 image
In the table above 'T' is time of exposure beginning, 'Tm' is mid-exposure
time.
The power law slope is alpha = 1.42.
The GRB140129B duration is small (T_90 < 2 sec, Palmer et al., GCN 15774),
but spectrum is soft and this burst must be faint long GRB (Pal'shin,
privet communication; Palmer et al., GCN 15774).
Animation of seven frames by MASTER-Tunka is uploaded to
http://master.sai.msu.ru/static/GRB/GRB140129B-MASTER-Tunka-anim.gif
The light curve is available here:
http://master.sai.msu.ru/static/GRB/GRB140129B_last.png
Take the opportunity we would like to congratulate our first author from
Siberia Vladimir Poleshchuk with the birth of the grandchild.
The message may be cited.