GRB150618_212851_INTEGRAL at TAROT Calern observatory

TAROT Calern observatory log of images

AL_20150618_213011948_000000_00000001     0 star  filter C [   16.3s -    76.3s] expo= 60s elev=36.2deg humid= 78% sunelev=-17.1deg (moon at 129.0deg phase=0.16 elev= -9.0 )
AL_20150618_213058276_000000_00000001    82 stars filter C [   92.6s -   122.6s] expo= 30s elev=36.4deg humid= 78% sunelev=-17.2deg (moon at 129.0deg phase=0.16 elev= -9.0 )
AL_20150618_213138542_000000_00000001    80 stars filter C [  132.9s -   162.9s] expo= 30s elev=36.5deg humid= 78% sunelev=-17.3deg (moon at 129.0deg phase=0.16 elev= -9.0 )
AL_20150618_213219293_000000_00000001    86 stars filter C [  173.6s -   203.6s] expo= 30s elev=36.6deg humid= 78% sunelev=-17.4deg (moon at 129.0deg phase=0.16 elev= -9.0 )
AL_20150618_213300058_000000_00000001    86 stars filter C [  214.4s -   244.4s] expo= 30s elev=36.7deg humid= 78% sunelev=-17.4deg (moon at 129.0deg phase=0.16 elev=-10.0 )
AL_20150618_213340589_000000_00000001    81 stars filter C [  254.9s -   284.9s] expo= 30s elev=36.9deg humid= 78% sunelev=-17.5deg (moon at 129.0deg phase=0.16 elev=-10.0 )
AL_20150618_213521074_000000_00000001   108 stars filter C [  295.4s -   385.4s] expo= 90s elev=37.1deg humid= 78% sunelev=-17.5deg (moon at 129.0deg phase=0.16 elev=-10.0 )
AL_20150618_213701902_000000_00000001   100 stars filter C [  396.2s -   486.2s] expo= 90s elev=37.4deg humid= 78% sunelev=-17.7deg (moon at 129.0deg phase=0.16 elev=-10.0 )
AL_20150618_213842371_000000_00000001    84 stars filter R [  496.7s -   586.7s] expo= 90s elev=37.7deg humid= 78% sunelev=-17.8deg (moon at 129.0deg phase=0.16 elev=-10.0 )
AL_20150618_214023824_000000_00000001   105 stars filter C [  598.1s -   688.1s] expo= 90s elev=37.9deg humid= 78% sunelev=-18.0deg (moon at 129.0deg phase=0.16 elev=-11.0 )
AL_20150618_214204496_000000_00000001   107 stars filter C [  698.9s -   788.9s] expo= 90s elev=38.2deg humid= 78% sunelev=-18.1deg (moon at 129.0deg phase=0.16 elev=-11.0 )
AL_20150618_214345832_000000_00000001    82 stars filter R [  800.1s -   890.1s] expo= 90s elev=38.5deg humid= 78% sunelev=-18.2deg (moon at 129.0deg phase=0.16 elev=-11.0 )
AL_20150618_214527301_000000_00000001   107 stars filter C [  901.5s -   991.5s] expo= 90s elev=38.8deg humid= 78% sunelev=-18.4deg (moon at 129.0deg phase=0.16 elev=-11.0 )
AL_20150618_214708442_000000_00000001   104 stars filter C [ 1002.7s -  1092.7s] expo= 90s elev=39.1deg humid= 79% sunelev=-18.5deg (moon at 129.0deg phase=0.16 elev=-11.0 )
AL_20150618_214849004_000000_00000001    84 stars filter R [ 1103.3s -  1193.3s] expo= 90s elev=39.4deg humid= 79% sunelev=-18.6deg (moon at 129.0deg phase=0.16 elev=-12.0 )
AL_20150618_215029567_000000_00000001   104 stars filter C [ 1203.8s -  1293.8s] expo= 90s elev=39.7deg humid= 79% sunelev=-18.8deg (moon at 129.0deg phase=0.16 elev=-12.0 )
AL_20150618_215210739_000000_00000001   103 stars filter C [ 1305.0s -  1395.0s] expo= 90s elev=40.0deg humid= 79% sunelev=-18.9deg (moon at 129.0deg phase=0.16 elev=-12.0 )
AL_20150618_215351452_000000_00000001    80 stars filter R [ 1405.7s -  1495.7s] expo= 90s elev=40.3deg humid= 79% sunelev=-19.0deg (moon at 129.0deg phase=0.16 elev=-12.0 )
AL_20150618_215437108_000000_00000001     0 star  filter C [ 1507.2s -  1597.2s] expo= 90s elev=40.6deg humid= 79% sunelev=-19.1deg (moon at 129.0deg phase=0.16 elev=-13.0 )
AL_20150618_232956111_000003_46350601   108 stars filter C [ 7080.5s -  7260.5s] expo=180s elev=57.5deg humid= 75% sunelev=-22.8deg (moon at 129.0deg phase=0.16 elev=-24.0 )
AL_20150618_233307361_000003_46350601   123 stars filter C [ 7271.7s -  7451.7s] expo=180s elev=58.1deg humid= 75% sunelev=-22.8deg (moon at 129.0deg phase=0.16 elev=-24.0 )
AL_20150618_233618552_000003_46350601   103 stars filter R [ 7462.9s -  7642.9s] expo=180s elev=58.6deg humid= 74% sunelev=-22.8deg (moon at 129.0deg phase=0.16 elev=-24.0 )
AL_20150618_233934630_000003_46350701   109 stars filter C [ 7659.0s -  7839.0s] expo=180s elev=59.2deg humid= 74% sunelev=-22.8deg (moon at 129.0deg phase=0.16 elev=-25.0 )
AL_20150618_234245115_000003_46350701   126 stars filter C [ 7849.5s -  8029.5s] expo=180s elev=59.8deg humid= 74% sunelev=-22.8deg (moon at 129.0deg phase=0.16 elev=-25.0 )
AL_20150618_234555734_000003_46350701    99 stars filter R [ 8040.0s -  8220.0s] expo=180s elev=60.4deg humid= 74% sunelev=-22.8deg (moon at 129.0deg phase=0.16 elev=-25.0 )
AL_20150618_234911531_000003_46350801   129 stars filter C [ 8235.6s -  8415.6s] expo=180s elev=60.9deg humid= 75% sunelev=-22.8deg (moon at 129.0deg phase=0.16 elev=-26.0 )
AL_20150618_235222781_000003_46350801   126 stars filter C [ 8426.8s -  8606.8s] expo=180s elev=61.5deg humid= 75% sunelev=-22.7deg (moon at 129.0deg phase=0.16 elev=-26.0 )
AL_20150618_235533748_000003_46350801    96 stars filter R [ 8617.8s -  8797.8s] expo=180s elev=62.1deg humid= 77% sunelev=-22.7deg (moon at 129.0deg phase=0.16 elev=-26.0 )
AL_20150619_001736860_000003_46351101     0 star  filter C [ 9954.1s - 10134.1s] expo=180s elev=66.0deg humid= 77% sunelev=-22.1deg (moon at 129.0deg phase=0.17 elev=-28.0 )
Informations from GCN notice:
This is a GRB
Date of the alert : 2457192.39503 2015-06-18T21:28:50.592
Decoded useful notice informations.
RA(J2000.0) : 306.049150146 20h24m11s7
DEC(J2000.0) : 33.8959513998 +33d53m45s42
Error radius : 3.2 arcmin

Other pages about TAROT Calern observatory observations

Sum of images.
Differential photometry.

Galactic coordinates

Galactic coordinates : lon=73.1581326046 lat=-2.09741298713
NASA/IPAC-Extragalactic-Database tool for calculate an extinction

Extinction from Schlegel et al. (1998, ApJ 500, 525): E(B-V)=0.496
Assuming Rv=3.1: Av=1.645 Ar=1.326 Ai=0.962 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 7039) with the TAROT robotic telescope (D=25cm)
located at the Calern observatory, France.

The observations started 16.3s after the GRB trigger
(13.7s after the notice). The elevation of the field increased from
36 degrees above horizon and weather conditions
were XXX.

---- NO
The date of trigger : t0 = 2015-06-18T21:28:50.592

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+16.3s to t0+76.3s : R > 15.1

The second image is 30.0s exposure in tracking mode:
t0+92.6s to t0+122.6s : R > 16.2

We co-added a series of exposures:
t0+92.6s to t0+385.4s : 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 16.3s 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= 73.1581 lat= -2.0974
and the galactic extinction in R band is 1.3 magnitudes
estimated from D. Schlegel et al. 1998ApJ...500..525S.

This message may be cited.