GRB151118_030630_SWIFT at TAROT Calern observatory

TAROT Calern observatory log of images

AL_20151118_033838971_000000_01647401     8 stars filter C [ 1744.2s -  1924.2s] expo=180s elev=50.9deg humid= 83% sunelev=-31.1deg (moon at 109.0deg phase=0.42 elev=-58.0 )
AL_20151118_034150458_000000_01647401    16 stars filter C [ 1935.7s -  2115.7s] expo=180s elev=50.6deg humid= 80% sunelev=-30.5deg (moon at 109.0deg phase=0.42 elev=-58.0 )
AL_20151118_034501192_000000_01647401     4 stars filter R [ 2126.4s -  2306.4s] expo=180s elev=50.3deg humid= 79% sunelev=-30.0deg (moon at 109.0deg phase=0.42 elev=-58.0 )
AL_20151118_034819833_000000_01647501     3 stars filter C [ 2325.1s -  2505.1s] expo=180s elev=50.0deg humid= 77% sunelev=-29.4deg (moon at 108.0deg phase=0.42 elev=-58.0 )
AL_20151118_035130335_000000_01647501     3 stars filter C [ 2515.6s -  2695.6s] expo=180s elev=49.6deg humid= 73% sunelev=-28.8deg (moon at 108.0deg phase=0.42 elev=-58.0 )
AL_20151118_035441085_000000_01647501     4 stars filter R [ 2706.3s -  2886.3s] expo=180s elev=49.3deg humid= 66% sunelev=-28.2deg (moon at 108.0deg phase=0.42 elev=-59.0 )
AL_20151118_035804117_000000_01647601     8 stars filter C [ 2909.4s -  3089.4s] expo=180s elev=49.0deg humid= 67% sunelev=-27.6deg (moon at 108.0deg phase=0.42 elev=-59.0 )
AL_20151118_040115585_000000_01647601     3 stars filter C [ 3100.8s -  3280.8s] expo=180s elev=48.6deg humid= 64% sunelev=-27.0deg (moon at 108.0deg phase=0.42 elev=-59.0 )
AL_20151118_040427036_000000_01647601     5 stars filter R [ 3292.3s -  3472.3s] expo=180s elev=48.3deg humid= 60% sunelev=-26.5deg (moon at 108.0deg phase=0.42 elev=-59.0 )
AL_20151118_040747942_000000_01647701     8 stars filter C [ 3493.2s -  3673.2s] expo=180s elev=48.0deg humid= 57% sunelev=-25.9deg (moon at 108.0deg phase=0.42 elev=-59.0 )
AL_20151118_041059208_000000_01647701    17 stars filter C [ 3684.4s -  3864.4s] expo=180s elev=47.6deg humid= 53% sunelev=-25.3deg (moon at 108.0deg phase=0.42 elev=-59.0 )
AL_20151118_041410401_000000_01647701    15 stars filter R [ 3875.6s -  4055.6s] expo=180s elev=47.3deg humid= 52% sunelev=-24.7deg (moon at 108.0deg phase=0.42 elev=-60.0 )
AL_20151118_041732541_000000_01647801    18 stars filter C [ 4077.8s -  4257.8s] expo=180s elev=47.0deg humid= 50% sunelev=-24.1deg (moon at 108.0deg phase=0.42 elev=-60.0 )
AL_20151118_042043276_000000_01647801    13 stars filter C [ 4268.5s -  4448.5s] expo=180s elev=46.7deg humid= 48% sunelev=-23.5deg (moon at 108.0deg phase=0.42 elev=-60.0 )
AL_20151118_042354478_000000_01647801    13 stars filter R [ 4459.7s -  4639.7s] expo=180s elev=46.3deg humid= 45% sunelev=-23.0deg (moon at 108.0deg phase=0.42 elev=-60.0 )
AL_20151118_042716353_000000_01647901     4 stars filter C [ 4661.6s -  4841.6s] expo=180s elev=46.0deg humid= 43% sunelev=-22.4deg (moon at 108.0deg phase=0.42 elev=-60.0 )
AL_20151118_043027572_000000_01647901     1 star  filter C [ 4852.8s -  5032.8s] expo=180s elev=45.7deg humid= 42% sunelev=-21.8deg (moon at 108.0deg phase=0.42 elev=-60.0 )
AL_20151118_043339025_000000_01647901     0 star  filter R [ 5044.3s -  5224.3s] expo=180s elev=45.3deg humid= 43% sunelev=-21.2deg (moon at 108.0deg phase=0.42 elev=-60.0 )
AL_20151118_043659962_000000_01648001     0 star  filter C [ 5245.0s -  5425.0s] expo=180s elev=45.0deg humid= 45% sunelev=-20.6deg (moon at 108.0deg phase=0.42 elev=-60.0 )
AL_20151118_044011368_000000_01648001     0 star  filter C [ 5436.4s -  5616.4s] expo=180s elev=44.7deg humid= 46% sunelev=-20.0deg (moon at 108.0deg phase=0.42 elev=-60.0 )
AL_20151118_044322808_000000_01648001     0 star  filter R [ 5627.9s -  5807.9s] expo=180s elev=44.4deg humid= 47% sunelev=-19.5deg (moon at 108.0deg phase=0.42 elev=-60.0 )
AL_20151118_044644464_000000_01648101     0 star  filter C [ 5829.5s -  6009.5s] expo=180s elev=44.0deg humid= 47% sunelev=-18.9deg (moon at 108.0deg phase=0.42 elev=-60.0 )
AL_20151118_044955246_000000_01648101     0 star  filter C [ 6020.3s -  6200.3s] expo=180s elev=43.7deg humid= 48% sunelev=-18.3deg (moon at 108.0deg phase=0.42 elev=-60.0 )
AL_20151118_045306451_000000_01648101     0 star  filter R [ 6211.5s -  6391.5s] expo=180s elev=43.4deg humid= 47% sunelev=-17.7deg (moon at 108.0deg phase=0.42 elev=-60.0 )
AL_20151118_045628576_000000_01648201     0 star  filter C [ 6413.6s -  6593.6s] expo=180s elev=43.0deg humid= 46% sunelev=-17.1deg (moon at 108.0deg phase=0.42 elev=-60.0 )
AL_20151118_045940014_000000_01648201     0 star  filter C [ 6605.1s -  6785.1s] expo=180s elev=42.7deg humid= 44% sunelev=-16.6deg (moon at 108.0deg phase=0.42 elev=-60.0 )
AL_20151118_050250969_000000_01648201     0 star  filter R [ 6796.0s -  6976.0s] expo=180s elev=42.4deg humid= 43% sunelev=-16.0deg (moon at 108.0deg phase=0.43 elev=-59.0 )
AL_20151118_050621250_000000_01648301     0 star  filter C [ 7006.3s -  7186.3s] expo=180s elev=42.1deg humid= 42% sunelev=-15.4deg (moon at 108.0deg phase=0.43 elev=-59.0 )
AL_20151118_050932187_000000_01648301     0 star  filter C [ 7197.3s -  7377.3s] expo=180s elev=41.8deg humid= 39% sunelev=-14.8deg (moon at 108.0deg phase=0.43 elev=-59.0 )
AL_20151118_051243653_000000_01648301     0 star  filter R [ 7388.7s -  7568.7s] expo=180s elev=41.4deg humid= 37% sunelev=-14.3deg (moon at 108.0deg phase=0.43 elev=-59.0 )
AL_20151118_051559512_000000_01648401     0 star  filter C [ 7584.6s -  7764.6s] expo=180s elev=41.1deg humid= 36% sunelev=-13.7deg (moon at 108.0deg phase=0.43 elev=-59.0 )
AL_20151118_051910465_000000_01648401     0 star  filter C [ 7775.5s -  7955.5s] expo=180s elev=40.8deg humid= 36% sunelev=-13.1deg (moon at 108.0deg phase=0.43 elev=-59.0 )
AL_20151118_052221669_000000_01648401     0 star  filter R [ 7966.8s -  8146.8s] expo=180s elev=40.5deg humid= 35% sunelev=-12.6deg (moon at 108.0deg phase=0.43 elev=-58.0 )
AL_20151118_052540566_000000_01648501     0 star  filter C [ 8165.6s -  8345.6s] expo=180s elev=40.2deg humid= 35% sunelev=-12.0deg (moon at 108.0deg phase=0.43 elev=-58.0 )
AL_20151118_052851332_000000_01648501     0 star  filter C [ 8356.6s -  8536.6s] expo=180s elev=39.9deg humid= 34% sunelev=-11.4deg (moon at 108.0deg phase=0.43 elev=-58.0 )
AL_20151118_053202535_000000_01648501     0 star  filter R [ 8547.8s -  8727.8s] expo=180s elev=39.6deg humid= 34% sunelev=-10.9deg (moon at 108.0deg phase=0.43 elev=-58.0 )
AL_20151118_053523719_000000_01648601     0 star  filter C [ 8749.0s -  8929.0s] expo=180s elev=39.3deg humid= 34% sunelev=-10.3deg (moon at 108.0deg phase=0.43 elev=-58.0 )
AL_20151118_054145922_000000_01648601     0 star  filter R [ 9131.2s -  9311.2s] expo=180s elev=38.6deg humid= 33% sunelev=-9.2deg (moon at 108.0deg phase=0.43 elev=-57.0 )
Informations from GCN notice:
This is a GRB
Date of the alert : 2457344.62951 2015-11-18T03:06:29.664
Decoded useful notice informations.
RA(J2000.0) : 57.1719 03h48m41s2
DEC(J2000.0) : 65.9012 +65d54m04s32
Error radius : 2.2 arcsec
Error box : x=57:59 y=99:101 (pixels)

Other pages about TAROT Calern observatory observations

Sum of images.
Differential photometry.

Galactic coordinates

Galactic coordinates : lon=139.733170893 lat=8.95863600878
NASA/IPAC-Extragalactic-Database tool for calculate an extinction

Extinction from Schlegel et al. (1998, ApJ 500, 525): E(B-V)=1.080
Assuming Rv=3.1: Av=3.581 Ar=2.887 Ai=2.096 Extinction map E(B-V) from Schlegel:

Field of View is about 60 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 151118: 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 151118 detected by SWIFT
(trigger 664078) with the TAROT robotic telescope (D=25cm)
located at the Calern observatory, France.

The observations started 29.07min after the GRB trigger.
The elevation of the field decreased from
50 degrees above horizon and weather conditions
were XXX.

---- NO
The date of trigger : t0 = 2015-11-18T03:06:29.664

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+1744.2s to t0+1924.2s : R > 15.1

The second image is 180.0s exposure in tracking mode:
t0+1935.7s to t0+2115.7s : R > 16.2

We co-added a series of exposures:
t0+1935.7s to t0+3089.4s : R > 17.7
---- YES
We detect a new fading source in the error box given by SWIFT
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 29.07min 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=139.7332 lat= +8.9586
and the galactic extinction in R band is 2.9 magnitudes
estimated from D. Schlegel et al. 1998ApJ...500..525S.

This message may be cited.