GRB150626_181700_INTEGRAL at TAROT Calern observatory

TAROT Calern observatory log of images

AL_20150626_204610075_000003_46818901    62 stars filter C [ 8583.0s -  8763.0s] expo=180s elev=33.3deg humid= 75% sunelev=-11.9deg (moon at 101.0deg phase=0.65 elev=+31.0 )
AL_20150626_204923606_000003_46818901    63 stars filter C [ 8776.5s -  8956.5s] expo=180s elev=33.9deg humid= 75% sunelev=-12.3deg (moon at 101.0deg phase=0.65 elev=+31.0 )
AL_20150626_205237590_000003_46818901    53 stars filter R [ 8970.5s -  9150.5s] expo=180s elev=34.4deg humid= 75% sunelev=-12.7deg (moon at 101.0deg phase=0.65 elev=+31.0 )
AL_20150626_205402887_000003_46819001     0 star  filter C [ 9169.1s -  9349.1s] expo=180s elev=35.0deg humid= 75% sunelev=-13.0deg (moon at 101.0deg phase=0.65 elev=+31.0 )
AL_20150627_014210488_000003_46820801    92 stars filter C [26343.4s - 26523.4s] expo=180s elev=80.2deg humid= 77% sunelev=-17.3deg (moon at  99.0deg phase=0.66 elev=-10.0 )
AL_20150627_014523785_000003_46820801    72 stars filter R [26536.7s - 26716.7s] expo=180s elev=80.1deg humid= 78% sunelev=-17.0deg (moon at  99.0deg phase=0.66 elev=-11.0 )
AL_20150627_014837551_000003_46820801    50 stars filter V [26730.5s - 26910.5s] expo=180s elev=80.1deg humid= 79% sunelev=-16.7deg (moon at  99.0deg phase=0.66 elev=-12.0 )
Informations from GCN notice:
This is a GRB
Date of the alert : 2457200.26181 2015-06-26T18:17:00.384
Decoded useful notice informations.
RA(J2000.0) : 306.023887371 20h24m05s7
DEC(J2000.0) : 33.8580112542 +33d51m28s84
Error radius : 2.5 arcmin

Other pages about TAROT Calern observatory observations

Sum of images.
Differential photometry.

Galactic coordinates

Galactic coordinates : lon=73.1150643529 lat=-2.10222218207
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 150626: 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 150626 detected by INTEGRAL
(trigger 7144) with the TAROT robotic telescope (D=25cm)
located at the Calern observatory, France.

The observations started 2.38h after the GRB trigger.
The elevation of the field increased from
33 degrees above horizon and weather conditions
were XXX.

---- NO
The date of trigger : t0 = 2015-06-26T18:17:00.384

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+8583.0s to t0+8763.0s : R > 15.1

The second image is 180.0s exposure in tracking mode:
t0+8776.5s to t0+8956.5s : R > 16.2

We co-added a series of exposures:
t0+8776.5s to t0+26910.5s : 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 2.38h 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= 73.1151 lat= -2.1022
and the galactic extinction in R band is 1.3 magnitudes
estimated from D. Schlegel et al. 1998ApJ...500..525S.

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