GRB150618_003647_INTEGRAL at TAROT Calern observatory

TAROT Calern observatory log of images

AL_20150618_003807725_000000_00000001     0 star  filter C [   16.0s -    76.0s] expo= 60s elev=69.1deg humid= 86% sunelev=-21.2deg (moon at 125.0deg phase=0.10 elev=-29.0 )
AL_20150618_003853366_000000_00000001    66 stars filter C [   91.6s -   121.6s] expo= 30s elev=69.3deg humid= 86% sunelev=-21.2deg (moon at 125.0deg phase=0.10 elev=-29.0 )
AL_20150618_003934803_000000_00000001    64 stars filter C [  133.0s -   163.0s] expo= 30s elev=69.4deg humid= 86% sunelev=-21.1deg (moon at 125.0deg phase=0.10 elev=-29.0 )
AL_20150618_004015731_000000_00000001    67 stars filter C [  174.0s -   204.0s] expo= 30s elev=69.5deg humid= 87% sunelev=-21.1deg (moon at 125.0deg phase=0.10 elev=-29.0 )
AL_20150618_004056528_000000_00000001    66 stars filter C [  214.8s -   244.8s] expo= 30s elev=69.6deg humid= 87% sunelev=-21.1deg (moon at 125.0deg phase=0.10 elev=-29.0 )
AL_20150618_004137263_000000_00000001    69 stars filter C [  255.5s -   285.5s] expo= 30s elev=69.7deg humid= 86% sunelev=-21.0deg (moon at 125.0deg phase=0.10 elev=-29.0 )
AL_20150618_004317810_000000_00000001    86 stars filter C [  296.0s -   386.0s] expo= 90s elev=69.9deg humid= 86% sunelev=-21.0deg (moon at 125.0deg phase=0.10 elev=-29.0 )
AL_20150618_004458763_000000_00000001    89 stars filter C [  397.0s -   487.0s] expo= 90s elev=70.2deg humid= 86% sunelev=-20.9deg (moon at 125.0deg phase=0.10 elev=-29.0 )
AL_20150618_004548528_000000_00000001     0 star  filter R [  497.8s -   587.8s] expo= 90s elev=70.5deg humid= 86% sunelev=-20.8deg (moon at 125.0deg phase=0.10 elev=-29.0 )
AL_20150618_005031069_000003_46263501    61 stars filter C [  729.4s -   819.4s] expo= 90s elev=71.1deg humid= 86% sunelev=-20.6deg (moon at 125.0deg phase=0.10 elev=-29.0 )
AL_20150618_005212304_000003_46263501    60 stars filter C [  830.6s -   920.6s] expo= 90s elev=71.4deg humid= 86% sunelev=-20.5deg (moon at 125.0deg phase=0.10 elev=-29.0 )
AL_20150618_005353507_000003_46263501    60 stars filter C [  931.8s -  1021.8s] expo= 90s elev=71.7deg humid= 87% sunelev=-20.4deg (moon at 125.0deg phase=0.10 elev=-29.0 )
AL_20150618_005539350_000003_46263601    61 stars filter C [ 1037.7s -  1127.7s] expo= 90s elev=72.0deg humid= 87% sunelev=-20.3deg (moon at 125.0deg phase=0.10 elev=-29.0 )
AL_20150618_005720616_000003_46263601    62 stars filter C [ 1138.9s -  1228.9s] expo= 90s elev=72.2deg humid= 86% sunelev=-20.2deg (moon at 125.0deg phase=0.10 elev=-29.0 )
AL_20150618_005901366_000003_46263601    61 stars filter C [ 1239.6s -  1329.6s] expo= 90s elev=72.5deg humid= 86% sunelev=-20.1deg (moon at 125.0deg phase=0.10 elev=-29.0 )
AL_20150618_023412807_000003_46264701    45 stars filter C [ 6861.0s -  7041.0s] expo=180s elev=79.5deg humid= 87% sunelev=-11.4deg (moon at 125.0deg phase=0.11 elev=-25.0 )
AL_20150618_023723307_000003_46264701    48 stars filter C [ 7051.6s -  7231.6s] expo=180s elev=79.2deg humid= 87% sunelev=-11.0deg (moon at 125.0deg phase=0.11 elev=-24.0 )
AL_20150618_024034229_000003_46264701    44 stars filter R [ 7242.5s -  7422.5s] expo=180s elev=78.9deg humid= 86% sunelev=-10.6deg (moon at 125.0deg phase=0.11 elev=-24.0 )
AL_20150618_024356670_000003_46264801    34 stars filter C [ 7444.9s -  7624.9s] expo=180s elev=78.6deg humid= 85% sunelev=-10.2deg (moon at 125.0deg phase=0.11 elev=-24.0 )
AL_20150618_024707373_000003_46264801    32 stars filter C [ 7635.6s -  7815.6s] expo=180s elev=78.3deg humid= 86% sunelev=-9.8deg (moon at 125.0deg phase=0.11 elev=-24.0 )
AL_20150618_025018810_000003_46264801    32 stars filter R [ 7827.1s -  8007.1s] expo=180s elev=78.0deg humid= 86% sunelev=-9.4deg (moon at 125.0deg phase=0.11 elev=-23.0 )
Informations from GCN notice:
This is a GRB
Date of the alert : 2457191.52554 2015-06-18T00:36:46.656
Decoded useful notice informations.
RA(J2000.0) : 305.99327044 20h23m58s3
DEC(J2000.0) : 33.8755269836 +33d52m31s89
Error radius : 2.6 arcmin
Error box : x=7:104 y=3:100 (pixels)

Other pages about TAROT Calern observatory observations

Sum of images.
Differential photometry.

Galactic coordinates

Galactic coordinates : lon=73.1196937877 lat=-2.05742526051
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 7016) with the TAROT robotic telescope (D=25cm)
located at the Calern observatory, France.

The observations started 16.0s after the GRB trigger
(12.5s after the notice). The elevation of the field increased from
69 degrees above horizon and weather conditions
were XXX.

---- NO
The date of trigger : t0 = 2015-06-18T00:36:46.656

The first image is trailed with a duration of 60.0s
(see the description in Klotz et al., 2006, A&A 451, L39).
We do not detect any OT with a limiting magnitude of:
t0+16.0s to t0+76.0s : R > 15.1

The second image is 30.0s exposure in tracking mode:
t0+91.6s to t0+121.6s : R > 16.2

We co-added a series of exposures:
t0+91.6s to t0+386.0s : 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 16.0s 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= 73.1197 lat= -2.0574
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.