GRB150620_235529_INTEGRAL at TAROT Calern observatory

TAROT Calern observatory log of images

AL_20150621_005020309_000003_46551001     0 star  filter C [ 3106.5s -  3286.5s] expo=180s elev=72.9deg humid= 75% sunelev=-20.7deg (moon at 133.0deg phase=0.29 elev=-27.0 )
AL_20150621_005331059_000003_46551001     0 star  filter C [ 3297.2s -  3477.2s] expo=180s elev=73.4deg humid= 75% sunelev=-20.5deg (moon at 133.0deg phase=0.29 elev=-27.0 )
AL_20150621_005641559_000003_46551001     0 star  filter R [ 3487.8s -  3667.8s] expo=180s elev=73.9deg humid= 75% sunelev=-20.3deg (moon at 133.0deg phase=0.29 elev=-28.0 )
AL_20150621_010001088_000003_46551101     0 star  filter C [ 3687.3s -  3867.3s] expo=180s elev=74.4deg humid= 75% sunelev=-20.1deg (moon at 133.0deg phase=0.29 elev=-28.0 )
AL_20150621_010311791_000003_46551101     0 star  filter C [ 3878.1s -  4058.1s] expo=180s elev=74.8deg humid= 75% sunelev=-19.9deg (moon at 133.0deg phase=0.29 elev=-28.0 )
AL_20150621_010622557_000003_46551101     0 star  filter R [ 4068.8s -  4248.8s] expo=180s elev=75.3deg humid= 75% sunelev=-19.7deg (moon at 133.0deg phase=0.29 elev=-29.0 )
AL_20150621_010945659_000003_46551201     0 star  filter C [ 4271.9s -  4451.9s] expo=180s elev=75.8deg humid= 76% sunelev=-19.5deg (moon at 133.0deg phase=0.29 elev=-29.0 )
AL_20150621_011255971_000003_46551201     0 star  filter C [ 4462.2s -  4642.2s] expo=180s elev=76.2deg humid= 75% sunelev=-19.2deg (moon at 133.0deg phase=0.29 elev=-29.0 )
AL_20150621_011606409_000003_46551201     0 star  filter R [ 4652.7s -  4832.7s] expo=180s elev=76.7deg humid= 76% sunelev=-19.0deg (moon at 133.0deg phase=0.29 elev=-30.0 )
AL_20150621_011929533_000003_46551301     0 star  filter C [ 4855.7s -  5035.7s] expo=180s elev=77.1deg humid= 75% sunelev=-18.7deg (moon at 133.0deg phase=0.29 elev=-30.0 )
AL_20150621_012240190_000003_46551301     0 star  filter C [ 5046.5s -  5226.5s] expo=180s elev=77.5deg humid= 75% sunelev=-18.5deg (moon at 133.0deg phase=0.29 elev=-30.0 )
AL_20150621_012550736_000003_46551301     0 star  filter R [ 5237.0s -  5417.0s] expo=180s elev=77.9deg humid= 75% sunelev=-18.3deg (moon at 133.0deg phase=0.29 elev=-31.0 )
AL_20150621_024916625_000003_46552301     0 star  filter C [10242.9s - 10422.9s] expo=180s elev=76.7deg humid= 75% sunelev=-9.5deg (moon at 132.0deg phase=0.30 elev=-36.0 )
AL_20150621_025538125_000003_46552301     0 star  filter R [10624.4s - 10804.4s] expo=180s elev=75.8deg humid= 76% sunelev=-8.7deg (moon at 132.0deg phase=0.30 elev=-36.0 )
Informations from GCN notice:
This is a GRB
Date of the alert : 2457194.49686 2015-06-20T23:55:28.704
Decoded useful notice informations.
RA(J2000.0) : 306.009029548 20h24m02s1
DEC(J2000.0) : 33.9026812185 +33d54m09s65
Error radius : 2.5 arcmin

Other pages about TAROT Calern observatory observations

Sum of images.
Differential photometry.

Galactic coordinates

Galactic coordinates : lon=73.144541633 lat=-2.06637815173
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 150620: 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 150620 detected by INTEGRAL
(trigger 7079) with the TAROT robotic telescope (D=25cm)
located at the Calern observatory, France.

The observations started 51.77min after the GRB trigger.
The elevation of the field increased from
72 degrees above horizon and weather conditions
were XXX.

---- NO
The date of trigger : t0 = 2015-06-20T23:55:28.704

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+3106.5s to t0+3286.5s : R > 15.1

The second image is 180.0s exposure in tracking mode:
t0+3297.2s to t0+3477.2s : R > 16.2

We co-added a series of exposures:
t0+3297.2s to t0+4451.9s : 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 51.77min 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= 73.1445 lat= -2.0664
and the galactic extinction in R band is 1.4 magnitudes
estimated from D. Schlegel et al. 1998ApJ...500..525S.

This message may be cited.