GRB 141124A

K.Ivanov, S.Yazev, N.M.Budnev, O.Gres, O.Chuvalaev, V.A.Poleshchuk
Irkutsk State University

V. Shumkov, E. Gorbovskoy, D.Denisenko, V. Lipunov, M.Pruzhinskaya, 
V.Kornilov, D.Kuvshinov, N.Tyurina, P.Balanutsa, D.Zimnukhov, A.Kuznetsov 
Lomonosov Moscow State University,
Sternberg Astronomical Institute, Moscow State University

V.Yurkov, Yu.Sergienko, D.Varda, E.Sinyakov
Blagoveschensk Educational State University, Blagoveschensk

A. Tlatov, A.V. Parhomenko, D. Dormidontov, V.Sennik
Kislovodsk Solar Station of the Pulkovo Observatory

V.Krushinsky, I.Zalozhnih,  A. Popov
Ural Federal University, Yekaterinburg, Kourovka

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 OT J075043.33+790917.1 - new flare of QSO NVSS J075043+790917 = 
MASTER OT J075042.60+790918.2

MASTER II  robotic telescope (MASTER-Net: http://observ.pereplet.ru) 
located in Tunka was starting survey on the FERMI  GRB141124A (GBM 
trigger  number 438503903 ) error-box   2286 sec after notice time and 
15886 sec after trigger time at 2014-11-24 11:03:07 UT.

During the inspection of the Fermi error box MASTER-Tunka
auto-detection system discovered OT source at (RA, 
Dec) = 07h 50m 43.33s +79d 09m 17.1s on 2014-11-24.62164 UT. The OT 
unfiltered magnitude is 17.5m (limit 18.4m). The OT is seen in 3 images. 
There is no minor planet at this place. We have reference image without OT 
on 2010-11-13.70064 UT with unfiltered magnitude limit 21.2m.

The OT is a new flare of quasar NVSS J075043+790917 that was previously 
detected by MASTER-Amur on 2013-04-26.694 UT as MASTER OT 
J075042.60+790918.2 (see ATel #5044, S. Shurpakov et al.). The object is 
marginally visible on the Blue Palomar plate with jmag=22.31 in GSC 2.3.2. 
There is an infrared counterpart AllWISE J075043.29+790917.1 
(W1=14.05+/-0.03 W2=13.01+/-0.03 W3=9.53+/-0.03 W4=7.20+/-0.09). This area 
of sky is not covered by SDSS and CRTS. Color-combined DSS finder chart is 
uploaded to http://master.sai.msu.ru/static/OT/J075043+790917-BRIR.jpg 
(10'x10' FOV).

We note that in our previous observations of this field by MASTER-Tunka on 
2014-10-26.644 UT (by the coincidence, also during Fermi error box 
inspection for trigger number 436028617) the object was marginally 
detected at ~18.5m. Multi-wavelength follow up observations are required.

The discovery and reference images are available at: 
http://master.sai.msu.ru/static/OT/075043.33790917.1.png

The inspection map of Fermi error box is available at: 
http://master.sai.msu.ru/static/OT/1468936236.png

The message may be cited.

V. Bhalerao (IUCAA), S. B. Cenko (NASA/GSFC), L. P. Singer (Caltech)
���and ���
M. M. Kasliwal (Carnegie Observatories/Princeton)
��� ���
report on behalf of the intermediate Palomar Transient Factory (iPTF)
collaboration:

We searched for optical counterparts of GRB 141124A
��� (GCN Notice http://gcn.gsfc.nasa.gov/other/438503903.fermi)
 using the Palomar 48-inch Oschin telescope (P48). At about 18 minutes
after the burst, we began imaging 30 fields spanning an area of 2
���12���
 deg2, covering most of the 1-sigma statistical+systematic region of the
initial Fermi GBM localization, as well as about half of the 1-sigma
statistical + systematic region of the final Fermi GBM localization (Fermi
trigger 438503903 / 141124277). Based on the GBM localization, we estimate
a
���44%
 chance that these fields contain the true location of the source.

Sifting through candidate variable sources using
���
image subtraction and standard iPTF vetting procedures, we detected the
��� ���
following optical transient candidates
���:���


iPTF14ihm
RA (J2000) 08:22:15.03 (125.562634 deg)
Dec (J2000) +74:50:00.5 (+74.833477 deg)
Consistent with stellar source, photometry does not show rapid evolution.

iPTF14ihn
RA (J2000) 10:36:56.79 (159.236626 deg)
Dec (J2000) +71:10:52.0 (+71.181099 deg)
Likely high proper motion star, photometry does not show rapid evolution.

iPTF14iho
RA (J2000) 09:45:09.42 (146.289253 deg)
Dec (J2000) +74:20:12.1 (+74.336707 deg)
Near undocumented galaxy, photometry does not show rapid evolution.

iPTF14ihp
RA (J2000) 10:54:59.28 (163.746991 deg)
Dec (J2000) +68:11:53.5 (+68.198184 deg)
Photometry shows decline over 60-minute period, but the image subtraction
residuals are centered on a stellar source in the reference image. This is
most likely a galactic variable.

���We conclude that we have not detected the optical afterglow of GRB
141124A���.