GRB150618_184022_INTEGRAL at TAROT Calern observatory

TAROT Calern observatory log of images

AL_20150618_204200986_000003_46343201    43 stars filter C [ 7114.1s -  7294.1s] expo=180s elev=27.8deg humid= 80% sunelev=-11.9deg (moon at 129.0deg phase=0.15 elev= -2.0 )
AL_20150618_204512158_000003_46343201    50 stars filter C [ 7305.3s -  7485.3s] expo=180s elev=28.3deg humid= 80% sunelev=-12.3deg (moon at 129.0deg phase=0.15 elev= -2.0 )
AL_20150618_204822658_000003_46343201    34 stars filter R [ 7495.8s -  7675.8s] expo=180s elev=28.9deg humid= 80% sunelev=-12.7deg (moon at 129.0deg phase=0.15 elev= -3.0 )
AL_20150618_211021165_000003_46343501    64 stars filter C [ 8814.2s -  8994.2s] expo=180s elev=32.6deg humid= 81% sunelev=-15.0deg (moon at 129.0deg phase=0.15 elev= -6.0 )
AL_20150618_211332348_000003_46343501    64 stars filter C [ 9005.4s -  9185.4s] expo=180s elev=33.2deg humid= 82% sunelev=-15.4deg (moon at 129.0deg phase=0.15 elev= -6.0 )
AL_20150618_211643144_000003_46343501    57 stars filter R [ 9196.2s -  9376.2s] expo=180s elev=33.7deg humid= 79% sunelev=-15.7deg (moon at 129.0deg phase=0.16 elev= -7.0 )
AL_20150618_211959707_000003_46343601    67 stars filter C [ 9392.7s -  9572.7s] expo=180s elev=34.3deg humid= 80% sunelev=-16.0deg (moon at 129.0deg phase=0.16 elev= -7.0 )
AL_20150618_212310151_000003_46343601    59 stars filter C [ 9583.3s -  9763.3s] expo=180s elev=34.8deg humid= 78% sunelev=-16.3deg (moon at 129.0deg phase=0.16 elev= -8.0 )
AL_20150618_212621120_000003_46343601    56 stars filter R [ 9774.2s -  9954.2s] expo=180s elev=35.4deg humid= 79% sunelev=-16.6deg (moon at 129.0deg phase=0.16 elev= -8.0 )
AL_20150618_220712212_000003_46344101    75 stars filter C [12225.3s - 12405.3s] expo=180s elev=42.6deg humid= 77% sunelev=-19.8deg (moon at 129.0deg phase=0.16 elev=-14.0 )
AL_20150618_221022681_000003_46344101    62 stars filter C [12415.8s - 12595.8s] expo=180s elev=43.2deg humid= 77% sunelev=-20.1deg (moon at 129.0deg phase=0.16 elev=-15.0 )
AL_20150618_221333512_000003_46344101    56 stars filter R [12606.6s - 12786.6s] expo=180s elev=43.7deg humid= 77% sunelev=-20.3deg (moon at 129.0deg phase=0.16 elev=-15.0 )
Informations from GCN notice:
This is a GRB
Date of the alert : 2457192.27803 2015-06-18T18:40:21.792
Decoded useful notice informations.
RA(J2000.0) : 305.999157885 20h23m59s7
DEC(J2000.0) : 33.8817131411 +33d52m54s16
Error radius : 2.6 arcmin

Other pages about TAROT Calern observatory observations

Sum of images.
Differential photometry.

Galactic coordinates

Galactic coordinates : lon=73.1225617178 lat=-2.07162681659
NASA/IPAC-Extragalactic-Database tool for calculate an extinction

Extinction from Schlegel et al. (1998, ApJ 500, 525): E(B-V)=0.509
Assuming Rv=3.1: Av=1.688 Ar=1.361 Ai=0.988 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 150618: 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 150618 detected by INTEGRAL
(trigger 7037) with the TAROT robotic telescope (D=25cm)
located at the Calern observatory, France.

The observations started 1.98h after the GRB trigger.
The elevation of the field increased from
27 degrees above horizon and weather conditions
were XXX.

---- NO
The date of trigger : t0 = 2015-06-18T18:40:21.792

The first image is trailed with a duration of 180.0s
(see the description in Klotz et al., 2006, A&A 451, L39).
We do not detect any OT with a limiting magnitude of:
t0+7114.1s to t0+7294.1s : R > 15.1

The second image is 180.0s exposure in tracking mode:
t0+7305.3s to t0+7485.3s : R > 16.2

We co-added a series of exposures:
t0+7305.3s to t0+9572.7s : 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 1.98h 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= 73.1226 lat= -2.0716
and the galactic extinction in R band is 1.4 magnitudes
estimated from D. Schlegel et al. 1998ApJ...500..525S.

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