GRB150618_180702_INTEGRAL at TAROT Calern observatory

TAROT Calern observatory log of images

AL_20150618_221905777_000003_46340901     0 star  filter C [14949.2s - 15129.2s] expo=180s elev=44.8deg humid= 76% sunelev=-20.6deg (moon at 129.0deg phase=0.16 elev=-16.0 )
AL_20150618_235850013_000003_46341301    75 stars filter C [20923.3s - 21103.3s] expo=180s elev=62.7deg humid= 77% sunelev=-22.6deg (moon at 129.0deg phase=0.16 elev=-26.0 )
AL_20150619_000201498_000003_46341301    51 stars filter R [21114.8s - 21294.8s] expo=180s elev=63.3deg humid= 77% sunelev=-22.6deg (moon at 129.0deg phase=0.16 elev=-27.0 )
AL_20150619_000513160_000003_46341301    44 stars filter V [21306.4s - 21486.4s] expo=180s elev=63.8deg humid= 77% sunelev=-22.5deg (moon at 129.0deg phase=0.16 elev=-27.0 )
Informations from GCN notice:
This is a GRB
Date of the alert : 2457192.25488 2015-06-18T18:07:01.632
Decoded useful notice informations.
RA(J2000.0) : 305.994268297 20h23m58s6
DEC(J2000.0) : 33.8856192927 +33d53m08s22
Error radius : 2.5 arcmin

Other pages about TAROT Calern observatory observations

Sum of images.
Differential photometry.

Galactic coordinates

Galactic coordinates : lon=73.1233736735 lat=-2.06598466522
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 7036) with the TAROT robotic telescope (D=25cm)
located at the Calern observatory, France.

The observations started 4.15h after the GRB trigger.
The elevation of the field increased from
44 degrees above horizon and weather conditions
were XXX.

---- NO
The date of trigger : t0 = 2015-06-18T18:07:01.632

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+14949.2s to t0+15129.2s : R > 15.1

The second image is 180.0s exposure in tracking mode:
t0+20923.3s to t0+21103.3s : R > 16.2

We co-added a series of exposures:
t0+20923.3s to t0+21486.4s : 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 4.15h 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= 73.1234 lat= -2.0660
and the galactic extinction in R band is 1.4 magnitudes
estimated from D. Schlegel et al. 1998ApJ...500..525S.

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