GRB150620_000057_INTEGRAL at TAROT Calern observatory

TAROT Calern observatory log of images

AL_20150620_023007477_000003_46472101    47 stars filter C [ 8765.3s -  8945.3s] expo=180s elev=79.2deg humid= 93% sunelev=-11.9deg (moon at 132.0deg phase=0.24 elev=-33.0 )
AL_20150620_023318339_000003_46472101    38 stars filter C [ 8956.3s -  9136.3s] expo=180s elev=78.9deg humid= 93% sunelev=-11.5deg (moon at 132.0deg phase=0.24 elev=-33.0 )
AL_20150620_023629417_000003_46472101    73 stars filter R [ 9147.3s -  9327.3s] expo=180s elev=78.6deg humid= 93% sunelev=-11.1deg (moon at 132.0deg phase=0.24 elev=-33.0 )
AL_20150620_023946823_000003_46472201    78 stars filter C [ 9344.8s -  9524.8s] expo=180s elev=78.3deg humid= 92% sunelev=-10.7deg (moon at 132.0deg phase=0.24 elev=-33.0 )
AL_20150620_024257437_000003_46472201    70 stars filter C [ 9535.3s -  9715.3s] expo=180s elev=77.9deg humid= 91% sunelev=-10.3deg (moon at 132.0deg phase=0.24 elev=-33.0 )
AL_20150620_024608109_000003_46472201    54 stars filter R [ 9726.0s -  9906.0s] expo=180s elev=77.5deg humid= 90% sunelev=-9.9deg (moon at 132.0deg phase=0.24 elev=-33.0 )
Informations from GCN notice:
This is a GRB
Date of the alert : 2457193.50066 2015-06-20T00:00:57.024
Decoded useful notice informations.
RA(J2000.0) : 306.027794273 20h24m06s6
DEC(J2000.0) : 33.8738673553 +33d52m25s92
Error radius : 3.3 arcmin

Other pages about TAROT Calern observatory observations

Sum of images.
Differential photometry.

Galactic coordinates

Galactic coordinates : lon=73.1300129607 lat=-2.09583263379
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 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 7068) with the TAROT robotic telescope (D=25cm)
located at the Calern observatory, France.

The observations started 2.43h after the GRB trigger.
The elevation of the field decreased from
79 degrees above horizon and weather conditions
were XXX.

---- NO
The date of trigger : t0 = 2015-06-20T00:00:57.024

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+8765.3s to t0+8945.3s : R > 15.1

The second image is 180.0s exposure in tracking mode:
t0+8956.3s to t0+9136.3s : R > 16.2

We co-added a series of exposures:
t0+8956.3s to t0+9906.0s : 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 2.43h 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= 73.1300 lat= -2.0958
and the galactic extinction in R band is 1.3 magnitudes
estimated from D. Schlegel et al. 1998ApJ...500..525S.

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