GRB150819_005009_SWIFT at TAROT Calern observatory

TAROT Calern observatory log of images

AL_20150819_005245514_000000_00000001     0 star  filter C [   31.0s -    91.0s] expo= 60s elev=31.3deg humid= 69% sunelev=-30.7deg (moon at 150.0deg phase=0.27 elev=-44.0 )
AL_20150819_005330717_000000_00000001     5 stars filter C [  136.2s -   166.2s] expo= 30s elev=31.5deg humid= 69% sunelev=-30.6deg (moon at 150.0deg phase=0.27 elev=-45.0 )
AL_20150819_005411373_000000_00000001     5 stars filter C [  176.9s -   206.9s] expo= 30s elev=31.6deg humid= 69% sunelev=-30.5deg (moon at 150.0deg phase=0.27 elev=-45.0 )
AL_20150819_005452904_000000_00000001     4 stars filter C [  218.4s -   248.4s] expo= 30s elev=31.8deg humid= 69% sunelev=-30.5deg (moon at 150.0deg phase=0.27 elev=-45.0 )
AL_20150819_005533873_000000_00000001     7 stars filter C [  259.4s -   289.4s] expo= 30s elev=31.9deg humid= 69% sunelev=-30.4deg (moon at 150.0deg phase=0.27 elev=-45.0 )
AL_20150819_005615092_000000_00000001     6 stars filter C [  300.6s -   330.6s] expo= 30s elev=32.0deg humid= 69% sunelev=-30.4deg (moon at 150.0deg phase=0.27 elev=-45.0 )
AL_20150819_005707764_000000_00000001     0 star  filter C [  281.8s -   371.8s] expo= 90s elev=32.0deg humid= 69% sunelev=-30.4deg (moon at 150.0deg phase=0.27 elev=-45.0 )
Informations from GCN notice:
This is a GRB
Date of the alert : 2457253.53483 2015-08-19T00:50:09.312
Decoded useful notice informations.
RA(J2000.0) : 42.3314 02h49m19s5
DEC(J2000.0) : 9.8066 +09d48m23s76
Error radius : 3.6 arcsec
Error box : x=69:71 y=88:90 (pixels)

Other pages about TAROT Calern observatory observations

Sum of images.
Differential photometry.

Galactic coordinates

Galactic coordinates : lon=164.728366265 lat=-43.3162885431
NASA/IPAC-Extragalactic-Database tool for calculate an extinction

Extinction from Schlegel et al. (1998, ApJ 500, 525): E(B-V)=0.113
Assuming Rv=3.1: Av=0.374 Ar=0.301 Ai=0.219
extmap.fit: Extinction map E(B-V) from Schlegel:

Field of View is about 98 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 150819: TAROT Calern observatory optical observations
----------------------------------------------------------------------
Klotz A., Turpin D. (IRAP-CNRS-OMP),
Boer M., Gendre B., Siellez K., Dereli H., Bardho O. (UNS-CNRS-OCA),
Atteia J.L. (IRAP-CNRS-OMP) report:

We imaged the field of GRB 150819 detected by SWIFT
(trigger 652643) with the TAROT robotic telescope (D=25cm)
located at the Calern observatory, France.

The observations started 31.0s after the GRB trigger
(-42.4s after the notice). The elevation of the field increased from
31 degrees above horizon and weather conditions
were XXX.

---- NO
The date of trigger : t0 = 2015-08-19T00:50:09.312

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+31.0s to t0+91.0s : R > 15.1

The second image is 30.0s exposure in tracking mode:
t0+136.2s to t0+166.2s : R > 16.2

We co-added a series of exposures:
t0+136.2s to t0+371.8s : R > 17.7
---- 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 31.0s 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=164.7284 lat=-43.3163
and the galactic extinction in R band is 0.3 magnitudes
estimated from D. Schlegel et al. 1998ApJ...500..525S.

This message may be cited.
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