GRB180414_235331_INTEGRAL at TAROT Calern observatory

TAROT Calern observatory log of images

AL_20180414_235504623_000000_00000001     0 star  filter C [   28.9s -    88.9s] expo= 60s elev=21.7deg humid= 34% sunelev=-36.4deg (moon at  96.0deg phase=0.08 elev=-44.0 )
AL_20180414_235546998_000000_00000001     1 star  filter C [  101.3s -   131.3s] expo= 30s elev=21.9deg humid= 34% sunelev=-36.4deg (moon at  96.0deg phase=0.08 elev=-43.0 )
AL_20180414_235627013_000000_00000001     1 star  filter C [  141.3s -   171.3s] expo= 30s elev=22.0deg humid= 34% sunelev=-36.4deg (moon at  96.0deg phase=0.08 elev=-43.0 )
AL_20180414_235648279_000000_00000001     0 star  filter C [  181.6s -   211.6s] expo= 30s elev=22.1deg humid= 35% sunelev=-36.4deg (moon at  96.0deg phase=0.08 elev=-43.0 )
AL_20180415_005456824_000001_17848001     1 star  filter C [ 3501.1s -  3681.1s] expo=180s elev=31.9deg humid= 32% sunelev=-33.6deg (moon at  97.0deg phase=0.08 elev=-38.0 )
AL_20180415_005807121_000001_17848001     0 star  filter C [ 3691.4s -  3871.4s] expo=180s elev=32.4deg humid= 34% sunelev=-33.4deg (moon at  97.0deg phase=0.08 elev=-38.0 )
AL_20180415_010117666_000001_17848001     1 star  filter C [ 3881.9s -  4061.9s] expo=180s elev=32.9deg humid= 34% sunelev=-33.1deg (moon at  97.0deg phase=0.08 elev=-37.0 )
AL_20180415_010445994_000001_17848101     3 stars filter C [ 4090.3s -  4270.3s] expo=180s elev=33.5deg humid= 33% sunelev=-32.9deg (moon at  97.0deg phase=0.08 elev=-37.0 )
AL_20180415_010756041_000001_17848101     2 stars filter C [ 4280.4s -  4460.4s] expo=180s elev=34.0deg humid= 31% sunelev=-32.6deg (moon at  97.0deg phase=0.08 elev=-36.0 )
AL_20180415_011105884_000001_17848101     1 star  filter C [ 4470.2s -  4650.2s] expo=180s elev=34.5deg humid= 32% sunelev=-32.3deg (moon at  97.0deg phase=0.08 elev=-36.0 )
AL_20180415_011435431_000001_17848201     1 star  filter C [ 4679.7s -  4859.7s] expo=180s elev=35.1deg humid= 33% sunelev=-32.0deg (moon at  97.0deg phase=0.08 elev=-36.0 )
AL_20180415_011745493_000001_17848201     1 star  filter C [ 4869.8s -  5049.8s] expo=180s elev=35.6deg humid= 36% sunelev=-31.7deg (moon at  97.0deg phase=0.08 elev=-35.0 )
AL_20180415_012055528_000001_17848201     1 star  filter C [ 5059.8s -  5239.8s] expo=180s elev=36.1deg humid= 37% sunelev=-31.4deg (moon at  97.0deg phase=0.08 elev=-35.0 )
AL_20180415_012425513_000001_17848301     1 star  filter C [ 5269.8s -  5449.8s] expo=180s elev=36.6deg humid= 37% sunelev=-31.1deg (moon at  97.0deg phase=0.08 elev=-34.0 )
AL_20180415_012736028_000001_17848301     2 stars filter C [ 5460.4s -  5640.4s] expo=180s elev=37.1deg humid= 36% sunelev=-30.8deg (moon at  97.0deg phase=0.08 elev=-34.0 )
AL_20180415_013046322_000001_17848301     1 star  filter C [ 5650.6s -  5830.6s] expo=180s elev=37.6deg humid= 37% sunelev=-30.5deg (moon at  97.0deg phase=0.08 elev=-33.0 )
AL_20180415_021254600_000001_17848801    13 stars filter C [ 8178.9s -  8358.9s] expo=180s elev=43.7deg humid= 38% sunelev=-25.7deg (moon at  98.0deg phase=0.07 elev=-27.0 )
AL_20180415_021605085_000001_17848801    19 stars filter C [ 8369.4s -  8549.4s] expo=180s elev=44.1deg humid= 38% sunelev=-25.3deg (moon at  98.0deg phase=0.07 elev=-27.0 )
AL_20180415_021915866_000001_17848801    35 stars filter C [ 8560.2s -  8740.2s] expo=180s elev=44.5deg humid= 39% sunelev=-24.9deg (moon at  98.0deg phase=0.07 elev=-26.0 )
AL_20180415_022244463_000001_17848901    20 stars filter C [ 8768.8s -  8948.8s] expo=180s elev=45.0deg humid= 40% sunelev=-24.4deg (moon at  98.0deg phase=0.07 elev=-26.0 )
AL_20180415_022554979_000001_17848901    11 stars filter C [ 8959.3s -  9139.3s] expo=180s elev=45.4deg humid= 38% sunelev=-24.0deg (moon at  98.0deg phase=0.07 elev=-25.0 )
AL_20180415_022905526_000001_17848901    27 stars filter C [ 9149.8s -  9329.8s] expo=180s elev=45.8deg humid= 36% sunelev=-23.6deg (moon at  98.0deg phase=0.07 elev=-25.0 )
AL_20180415_023233418_000001_17849001    25 stars filter C [ 9357.7s -  9537.7s] expo=180s elev=46.2deg humid= 36% sunelev=-23.1deg (moon at  98.0deg phase=0.07 elev=-24.0 )
AL_20180415_023543496_000001_17849001     7 stars filter C [ 9547.8s -  9727.8s] expo=180s elev=46.6deg humid= 36% sunelev=-22.7deg (moon at  98.0deg phase=0.07 elev=-24.0 )
AL_20180415_023853293_000001_17849001    18 stars filter C [ 9737.6s -  9917.6s] expo=180s elev=46.9deg humid= 38% sunelev=-22.2deg (moon at  98.0deg phase=0.07 elev=-23.0 )
AL_20180415_025154726_000001_17849201     1 star  filter C [10519.0s - 10699.0s] expo=180s elev=48.4deg humid= 40% sunelev=-20.4deg (moon at  98.0deg phase=0.07 elev=-21.0 )
AL_20180415_025504554_000001_17849201     2 stars filter C [10708.8s - 10888.8s] expo=180s elev=48.7deg humid= 38% sunelev=-19.9deg (moon at  98.0deg phase=0.07 elev=-21.0 )
AL_20180415_025815023_000001_17849201     1 star  filter C [10899.4s - 11079.4s] expo=180s elev=49.0deg humid= 36% sunelev=-19.5deg (moon at  98.0deg phase=0.07 elev=-20.0 )
AL_20180415_030143675_000001_17849301     1 star  filter C [11108.0s - 11288.0s] expo=180s elev=49.3deg humid= 38% sunelev=-19.0deg (moon at  98.0deg phase=0.07 elev=-20.0 )
AL_20180415_030453972_000001_17849301     1 star  filter C [11298.3s - 11478.3s] expo=180s elev=49.6deg humid= 37% sunelev=-18.5deg (moon at  98.0deg phase=0.07 elev=-19.0 )
AL_20180415_030804472_000001_17849301     1 star  filter C [11488.8s - 11668.8s] expo=180s elev=49.9deg humid= 39% sunelev=-18.0deg (moon at  98.0deg phase=0.07 elev=-19.0 )
AL_20180415_032057579_000001_17849501     0 star  filter C [12261.8s - 12441.8s] expo=180s elev=51.0deg humid= 40% sunelev=-16.0deg (moon at  99.0deg phase=0.07 elev=-16.0 )
AL_20180415_032407829_000001_17849501     0 star  filter C [12452.1s - 12632.1s] expo=180s elev=51.2deg humid= 40% sunelev=-15.6deg (moon at  99.0deg phase=0.07 elev=-16.0 )
AL_20180415_032717657_000001_17849501     0 star  filter C [12641.9s - 12821.9s] expo=180s elev=51.4deg humid= 40% sunelev=-15.1deg (moon at  99.0deg phase=0.07 elev=-15.0 )
AL_20180415_035439705_000001_17849901     2 stars filter C [14284.0s - 14464.0s] expo=180s elev=52.9deg humid= 38% sunelev=-10.7deg (moon at  99.0deg phase=0.07 elev=-11.0 )
AL_20180415_035749518_000001_17849901     1 star  filter C [14473.8s - 14653.8s] expo=180s elev=53.0deg humid= 37% sunelev=-10.1deg (moon at  99.0deg phase=0.07 elev=-10.0 )
AL_20180415_040059752_000001_17849901     0 star  filter C [14664.1s - 14844.1s] expo=180s elev=53.1deg humid= 37% sunelev=-9.6deg (moon at  99.0deg phase=0.07 elev=-10.0 )
Informations from GCN notice:
This is not a GRB (a retractation has been edited)
Date of the alert : 2458223.49549375 2018-04-14T23:53:30.660
Decoded useful notice informations.
RA(J2000.0) : 275.090312416 18h20m21s6
DEC(J2000.0) : 7.07757185844 +07d04m39s25
Error radius : 2.5 arcmin

Other pages about TAROT Calern observatory observations

Sum of images.
Differential photometry.

Galactic coordinates

Galactic coordinates : lon=35.7548461694 lat=10.112525445
NASA/IPAC-Extragalactic-Database tool for calculate an extinction

Extinction from Schlegel et al. (1998, ApJ 500, 525): E(B-V)=0.241
Assuming Rv=3.1: Av=0.800 Ar=0.645 Ai=0.468 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 180414: TAROT Calern observatory optical observations
Klotz A., Noysena.K., Atteia J.L. (CNRS-OMP-IRAP),
Boer, M., Eymar, L. (CNRS-ARTEMIS),
Gendre B. (UVI - Etelman Obs.) report:

We imaged the field of GRB 180414 detected by INTEGRAL
(trigger 8041) with the TAROT robotic telescope (D=25cm)
located at the Calern observatory, France.

The observations started 28.9s after the GRB trigger
(12.6s after the notice). The elevation of the field increased from
21 degrees above horizon and weather conditions
were XXX.

---- NO
The date of trigger : t0 = 2018-04-14T23:53:30.660

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+28.9s to t0+88.9s : R > 15.1

The second image is 30.0s exposure in tracking mode:
t0+101.3s to t0+131.3s : R > 16.2

We co-added a series of exposures:
t0+101.3s to t0+4061.9s : 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 28.9s 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= 35.7548 lat=+10.1125
and the galactic extinction in R band is 0.6 magnitudes
estimated from D. Schlegel et al. 1998ApJ...500..525S.

This message may be cited.