GRB150618_194125_INTEGRAL at TAROT Calern observatory

TAROT Calern observatory log of images

AL_20150618_222851649_000003_46347401    72 stars filter C [ 9861.4s - 10041.4s] expo=180s elev=46.5deg humid= 77% sunelev=-21.1deg (moon at 129.0deg phase=0.16 elev=-17.0 )
AL_20150618_223201962_000003_46347401    75 stars filter C [10051.7s - 10231.7s] expo=180s elev=47.1deg humid= 76% sunelev=-21.3deg (moon at 129.0deg phase=0.16 elev=-17.0 )
AL_20150618_223513864_000003_46347401    53 stars filter R [10243.6s - 10423.6s] expo=180s elev=47.6deg humid= 76% sunelev=-21.4deg (moon at 129.0deg phase=0.16 elev=-18.0 )
Informations from GCN notice:
This is a GRB
Date of the alert : 2457192.32043 2015-06-18T19:41:25.152
Decoded useful notice informations.
RA(J2000.0) : 306.014638146 20h24m03s5
DEC(J2000.0) : 33.8764938831 +33d52m35s37
Error radius : 2.7 arcmin
Error box : x=-8:88 y=-10:87 (pixels)

Other pages about TAROT Calern observatory observations

Sum of images.
Differential photometry.

Galactic coordinates

Galactic coordinates : lon=73.1326489307 lat=-2.05342718932
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 7038) with the TAROT robotic telescope (D=25cm)
located at the Calern observatory, France.

The observations started 2.74h after the GRB trigger.
The elevation of the field increased from
46 degrees above horizon and weather conditions
were XXX.

---- NO
The date of trigger : t0 = 2015-06-18T19:41:25.152

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+9861.4s to t0+10041.4s : R > 15.1

The second image is 180.0s exposure in tracking mode:
t0+10051.7s to t0+10231.7s : R > 16.2

We co-added a series of exposures:
t0+10051.7s to t0+10423.6s : 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 2.74h 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= 73.1326 lat= -2.0534
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.