GRB150620_215903_INTEGRAL at TAROT Calern observatory

TAROT Calern observatory log of images

AL_20150621_014050214_000003_46545401     0 star  filter C [13121.9s - 13301.9s] expo=180s elev=79.3deg humid= 76% sunelev=-17.0deg (moon at 133.0deg phase=0.29 elev=-32.0 )
AL_20150621_014401198_000003_46545401     0 star  filter C [13312.9s - 13492.9s] expo=180s elev=79.5deg humid= 76% sunelev=-16.7deg (moon at 133.0deg phase=0.29 elev=-32.0 )
AL_20150621_014711479_000003_46545401     0 star  filter R [13503.2s - 13683.2s] expo=180s elev=79.7deg humid= 76% sunelev=-16.4deg (moon at 133.0deg phase=0.29 elev=-32.0 )
AL_20150621_015039426_000003_46545501     0 star  filter C [13711.1s - 13891.1s] expo=180s elev=79.9deg humid= 76% sunelev=-16.1deg (moon at 133.0deg phase=0.29 elev=-33.0 )
AL_20150621_015350426_000003_46545501     1 star  filter C [13902.1s - 14082.1s] expo=180s elev=80.1deg humid= 76% sunelev=-15.8deg (moon at 133.0deg phase=0.30 elev=-33.0 )
AL_20150621_015701066_000003_46545501     0 star  filter R [14092.8s - 14272.8s] expo=180s elev=80.1deg humid= 76% sunelev=-15.4deg (moon at 133.0deg phase=0.30 elev=-33.0 )
AL_20150621_021000205_000003_46545701     0 star  filter C [14871.8s - 15051.8s] expo=180s elev=80.1deg humid= 75% sunelev=-14.1deg (moon at 133.0deg phase=0.30 elev=-34.0 )
AL_20150621_021310924_000003_46545701     0 star  filter C [15062.6s - 15242.6s] expo=180s elev=80.0deg humid= 75% sunelev=-13.8deg (moon at 133.0deg phase=0.30 elev=-34.0 )
AL_20150621_021621861_000003_46545701     0 star  filter R [15253.5s - 15433.5s] expo=180s elev=79.8deg humid= 75% sunelev=-13.4deg (moon at 133.0deg phase=0.30 elev=-34.0 )
Informations from GCN notice:
This is a GRB
Date of the alert : 2457194.41601 2015-06-20T21:59:03.264
Decoded useful notice informations.
RA(J2000.0) : 306.002495036 20h24m00s5
DEC(J2000.0) : 33.8799896841 +33d52m47s96
Error radius : 2.5 arcmin
Error box : x=21:113 y=-1:91 (pixels)

Other pages about TAROT Calern observatory observations

Sum of images.
Differential photometry.

Galactic coordinates

Galactic coordinates : lon=73.1405884594 lat=-2.06509514509
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 7076) with the TAROT robotic telescope (D=25cm)
located at the Calern observatory, France.

The observations started 3.65h after the GRB trigger.
The elevation of the field increased from
79 degrees above horizon and weather conditions
were XXX.

---- NO
The date of trigger : t0 = 2015-06-20T21:59:03.264

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+13121.9s to t0+13301.9s : R > 15.1

The second image is 180.0s exposure in tracking mode:
t0+13312.9s to t0+13492.9s : R > 16.2

We co-added a series of exposures:
t0+13312.9s to t0+15051.8s : 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 3.65h 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= 73.1406 lat= -2.0651
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.