GRB180316_045725_SWIFT at TAROT Calern observatory

TAROT Calern observatory log of images

AL_20180316_045924722_000000_00000001     0 star  filter C [   54.1s -   114.1s] expo= 60s elev=46.0deg humid= 70% sunelev=-8.8deg (moon at  77.0deg phase=0.09 elev= -5.0 )
Informations from GCN notice:
This is a GRB
Date of the alert : 2458193.70654039 2018-03-16T04:57:25.090
Decoded useful notice informations.
RA(J2000.0) : 265.4364 17h41m44s7
DEC(J2000.0) : 0.7365 +00d44m11s39
Error radius : 3.0 arcmin

Other pages about TAROT Calern observatory observations

Sum of images.
Differential photometry.

Galactic coordinates

Galactic coordinates : lon=25.46242864 lat=15.8029554237
NASA/IPAC-Extragalactic-Database tool for calculate an extinction

Extinction from Schlegel et al. (1998, ApJ 500, 525): E(B-V)=0.274
Assuming Rv=3.1: Av=0.908 Ar=0.732 Ai=0.531
extmap.fit: Extinction map E(B-V) from Schlegel:

Field of View is about 64 arcmin (north is NOT up !)

Bibliography (Last GCNC circulars and status of satellites)

GCN infos of this burst
GCN notice of this burst
Sloan Digital Sky Survey Observations of Gamma Ray Burst Fields
GCN info bursts
Gamma-ray burst real-time sky map
GRBlog
ROTSE last GRB images

Example of a GCNC email for this burst

gcncirc@capella.gsfc.nasa.gov
GRB 180316: TAROT Calern observatory optical observations
----------------------------------------------------------------------
Klotz A., Noysena.K., Atteia J.L. (CNRS-OMP-IRAP),
Boer, M., Eymar, L. (CNRS-ARTEMIS),
Gendre B. (UVI - Etelman Obs.) report:

We imaged the field of GRB 180316 detected by SWIFT
(trigger 814677) with the TAROT robotic telescope (D=25cm)
located at the Calern observatory, France.

The observations started 54.1s after the GRB trigger
(28.2s after the notice). The elevation of the field was at
46 degrees above horizon and weather conditions
were XXX.

---- NO
The date of trigger : t0 = 2018-03-16T04:57:25.090

The first image is trailed with a duration of 60.0s
(see the description in Klotz et al., 2006, A&A 451, L39).
We do not detect any OT with a limiting magnitude of:
t0+54.1s to t0+114.1s : R > 15.1

---- YES
We detect a new fading source in the error box given by SWIFT
We detected the candidate couterpart mentioned by XXX et al. (GCNC XXXX)
at the following position (+/- 3 arcsec):

RA(J2000.0) = XXh XXm XX.XXs
DEC(J2000.0) +XXd XX' XX.X"

OT was R~XX.X at 54.1s after GRB.
----

Magnitudes were estimated with the nearby USNO-B1 stars
and are not corrected for galactic dust extinction.

N.B. Galactic coordinates are lon= 25.4624 lat=+15.8030
and the galactic extinction in R band is 0.7 magnitudes
estimated from D. Schlegel et al. 1998ApJ...500..525S.

This message may be cited.
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