GRB150627_015948_INTEGRAL at TAROT Calern observatory

TAROT Calern observatory log of images

AL_20150627_020119926_000000_00000001     0 star  filter C [  -34.4s -    25.6s] expo= 60s elev=79.3deg humid= 80% sunelev=-15.1deg (moon at  99.0deg phase=0.66 elev=-14.0 )
AL_20150627_020207426_000000_00000001    45 stars filter C [   73.1s -   103.1s] expo= 30s elev=79.1deg humid= 80% sunelev=-14.9deg (moon at  99.0deg phase=0.66 elev=-15.0 )
AL_20150627_020251348_000000_00000001    51 stars filter C [  117.1s -   147.1s] expo= 30s elev=79.1deg humid= 80% sunelev=-14.9deg (moon at  99.0deg phase=0.66 elev=-15.0 )
AL_20150627_020334676_000000_00000001    52 stars filter C [  160.4s -   190.4s] expo= 30s elev=79.0deg humid= 80% sunelev=-14.8deg (moon at  99.0deg phase=0.66 elev=-15.0 )
AL_20150627_020418208_000000_00000001    52 stars filter C [  203.9s -   233.9s] expo= 30s elev=79.0deg humid= 80% sunelev=-14.7deg (moon at  99.0deg phase=0.66 elev=-15.0 )
AL_20150627_020501536_000000_00000001    51 stars filter C [  247.2s -   277.2s] expo= 30s elev=78.9deg humid= 80% sunelev=-14.6deg (moon at  99.0deg phase=0.66 elev=-15.0 )
AL_20150627_020645536_000000_00000001    69 stars filter C [  231.2s -   321.2s] expo= 90s elev=78.9deg humid= 80% sunelev=-14.7deg (moon at  99.0deg phase=0.66 elev=-15.0 )
AL_20150627_020829067_000000_00000001    80 stars filter C [  334.8s -   424.8s] expo= 90s elev=78.7deg humid= 80% sunelev=-14.5deg (moon at  99.0deg phase=0.66 elev=-15.0 )
AL_20150627_021012835_000000_00000001    60 stars filter R [  438.5s -   528.5s] expo= 90s elev=78.5deg humid= 80% sunelev=-14.3deg (moon at  99.0deg phase=0.66 elev=-16.0 )
AL_20150627_021156351_000000_00000001    69 stars filter C [  542.1s -   632.1s] expo= 90s elev=78.4deg humid= 79% sunelev=-14.1deg (moon at  99.0deg phase=0.66 elev=-16.0 )
AL_20150627_021340069_000000_00000001    76 stars filter C [  645.8s -   735.8s] expo= 90s elev=78.2deg humid= 79% sunelev=-13.9deg (moon at  99.0deg phase=0.66 elev=-16.0 )
AL_20150627_021524132_000000_00000001    48 stars filter R [  749.8s -   839.8s] expo= 90s elev=78.0deg humid= 79% sunelev=-13.8deg (moon at  99.0deg phase=0.66 elev=-17.0 )
AL_20150627_021707679_000000_00000001    70 stars filter C [  853.4s -   943.4s] expo= 90s elev=77.8deg humid= 78% sunelev=-13.6deg (moon at  99.0deg phase=0.66 elev=-17.0 )
AL_20150627_021851616_000000_00000001    76 stars filter C [  957.4s -  1047.4s] expo= 90s elev=77.6deg humid= 78% sunelev=-13.4deg (moon at  99.0deg phase=0.66 elev=-17.0 )
AL_20150627_022035218_000000_00000001    52 stars filter R [ 1060.9s -  1150.9s] expo= 90s elev=77.4deg humid= 78% sunelev=-13.2deg (moon at  99.0deg phase=0.66 elev=-18.0 )
AL_20150627_022218968_000000_00000001    71 stars filter C [ 1164.7s -  1254.7s] expo= 90s elev=77.2deg humid= 78% sunelev=-13.0deg (moon at  99.0deg phase=0.66 elev=-18.0 )
AL_20150627_022402750_000000_00000001    69 stars filter C [ 1268.4s -  1358.4s] expo= 90s elev=77.0deg humid= 79% sunelev=-12.8deg (moon at  99.0deg phase=0.66 elev=-18.0 )
AL_20150627_022546265_000000_00000001    58 stars filter R [ 1372.0s -  1462.0s] expo= 90s elev=76.7deg humid= 80% sunelev=-12.6deg (moon at  99.0deg phase=0.66 elev=-18.0 )
AL_20150627_022730046_000000_00000001    67 stars filter C [ 1475.7s -  1565.7s] expo= 90s elev=76.5deg humid= 80% sunelev=-12.4deg (moon at  99.0deg phase=0.66 elev=-19.0 )
AL_20150627_023044009_000000_00000001    71 stars filter C [ 1489.7s -  1669.7s] expo=180s elev=76.4deg humid= 81% sunelev=-12.4deg (moon at  99.0deg phase=0.66 elev=-19.0 )
AL_20150627_023357774_000000_00000001    66 stars filter C [ 1683.5s -  1863.5s] expo=180s elev=75.9deg humid= 81% sunelev=-12.0deg (moon at  99.0deg phase=0.66 elev=-20.0 )
AL_20150627_023711790_000000_00000001    53 stars filter R [ 1877.5s -  2057.5s] expo=180s elev=75.5deg humid= 81% sunelev=-11.6deg (moon at  99.0deg phase=0.66 elev=-20.0 )
AL_20150627_024025306_000000_00000001    59 stars filter C [ 2071.0s -  2251.0s] expo=180s elev=75.0deg humid= 81% sunelev=-11.2deg (moon at  99.0deg phase=0.66 elev=-21.0 )
AL_20150627_024339563_000000_00000001    53 stars filter C [ 2265.3s -  2445.3s] expo=180s elev=74.5deg humid= 81% sunelev=-10.9deg (moon at  99.0deg phase=0.66 elev=-21.0 )
AL_20150627_024653329_000000_00000001    48 stars filter R [ 2459.0s -  2639.0s] expo=180s elev=74.1deg humid= 81% sunelev=-10.5deg (moon at  99.0deg phase=0.66 elev=-22.0 )
AL_20150627_025006860_000000_00000001    41 stars filter C [ 2652.5s -  2832.5s] expo=180s elev=73.6deg humid= 81% sunelev=-10.1deg (moon at  99.0deg phase=0.66 elev=-22.0 )
AL_20150627_025320877_000000_00000001     0 star  filter C [ 2846.5s -  3026.5s] expo=180s elev=73.1deg humid= 80% sunelev=-9.7deg (moon at  99.0deg phase=0.66 elev=-23.0 )
AL_20150627_025634611_000000_00000001    25 stars filter R [ 3040.3s -  3220.3s] expo=180s elev=72.5deg humid= 80% sunelev=-9.2deg (moon at  99.0deg phase=0.66 elev=-23.0 )
AL_20150627_025948142_000000_00000001     0 star  filter C [ 3233.8s -  3413.8s] expo=180s elev=72.0deg humid= 81% sunelev=-8.8deg (moon at  99.0deg phase=0.66 elev=-24.0 )
Informations from GCN notice:
This is a GRB
Date of the alert : 2457200.58319 2015-06-27T01:59:47.616
Decoded useful notice informations.
RA(J2000.0) : 306.036882994 20h24m08s8
DEC(J2000.0) : 33.8647925684 +33d51m53s25
Error radius : 2.5 arcmin

Other pages about TAROT Calern observatory observations

Sum of images.
Differential photometry.

Galactic coordinates

Galactic coordinates : lon=73.1268362011 lat=-2.10715798494
NASA/IPAC-Extragalactic-Database tool for calculate an extinction

Extinction from Schlegel et al. (1998, ApJ 500, 525): E(B-V)=0.500
Assuming Rv=3.1: Av=1.657 Ar=1.336 Ai=0.970 Extinction map E(B-V) from Schlegel:

Field of View is about 56 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
ROTSE last GRB images

Example of a GCNC email for this burst
GRB 150627: 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 150627 detected by INTEGRAL
(trigger 7146) with the TAROT robotic telescope (D=25cm)
located at the Calern observatory, France.

The observations started -34.4s after the GRB trigger
(-39.6s after the notice). The elevation of the field decreased from
79 degrees above horizon and weather conditions
were XXX.

---- NO
The date of trigger : t0 = 2015-06-27T01:59:47.616

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+-34.4s to t0+25.6s : R > 15.1

The second image is 30.0s exposure in tracking mode:
t0+73.1s to t0+103.1s : R > 16.2

We co-added a series of exposures:
t0+73.1s to t0+321.2s : R > 17.7
---- YES
We detect a new fading source in the error box given by INTEGRAL
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 -34.4s 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= 73.1268 lat= -2.1072
and the galactic extinction in R band is 1.3 magnitudes
estimated from D. Schlegel et al. 1998ApJ...500..525S.

This message may be cited.