GRB150621_214654_INTEGRAL at TAROT Calern observatory

TAROT Calern observatory log of images

AL_20150621_214819100_000000_00000001     0 star  filter C [   19.9s -    79.9s] expo= 60s elev=41.5deg humid= 88% sunelev=-18.6deg (moon at 131.0deg phase=0.34 elev= +4.0 )
AL_20150621_214904258_000000_00000001    42 stars filter C [   95.0s -   125.0s] expo= 30s elev=41.7deg humid= 87% sunelev=-18.6deg (moon at 131.0deg phase=0.34 elev= +4.0 )
AL_20150621_214944976_000000_00000001    41 stars filter C [  135.8s -   165.8s] expo= 30s elev=41.8deg humid= 88% sunelev=-18.7deg (moon at 131.0deg phase=0.34 elev= +4.0 )
AL_20150621_215025555_000000_00000001    36 stars filter C [  176.3s -   206.3s] expo= 30s elev=41.9deg humid= 88% sunelev=-18.8deg (moon at 131.0deg phase=0.34 elev= +3.0 )
AL_20150621_215106039_000000_00000001    41 stars filter C [  216.8s -   246.8s] expo= 30s elev=42.0deg humid= 88% sunelev=-18.8deg (moon at 131.0deg phase=0.34 elev= +3.0 )
AL_20150621_215146789_000000_00000001    40 stars filter C [  257.5s -   287.5s] expo= 30s elev=42.1deg humid= 88% sunelev=-18.9deg (moon at 131.0deg phase=0.34 elev= +3.0 )
AL_20150621_215328195_000000_00000001    60 stars filter C [  299.0s -   389.0s] expo= 90s elev=42.4deg humid= 88% sunelev=-18.9deg (moon at 131.0deg phase=0.34 elev= +3.0 )
AL_20150621_215508492_000000_00000001    52 stars filter C [  399.3s -   489.3s] expo= 90s elev=42.7deg humid= 88% sunelev=-19.0deg (moon at 131.0deg phase=0.34 elev= +3.0 )
AL_20150621_215649226_000000_00000001    43 stars filter R [  500.0s -   590.0s] expo= 90s elev=43.0deg humid= 88% sunelev=-19.2deg (moon at 131.0deg phase=0.34 elev= +2.0 )
AL_20150621_215830242_000000_00000001    60 stars filter C [  601.0s -   691.0s] expo= 90s elev=43.3deg humid= 88% sunelev=-19.3deg (moon at 131.0deg phase=0.34 elev= +2.0 )
AL_20150621_220010638_000000_00000001    63 stars filter C [  701.5s -   791.5s] expo= 90s elev=43.6deg humid= 88% sunelev=-19.4deg (moon at 131.0deg phase=0.34 elev= +2.0 )
AL_20150621_220151888_000000_00000001    33 stars filter R [  802.7s -   892.7s] expo= 90s elev=43.9deg humid= 89% sunelev=-19.5deg (moon at 131.0deg phase=0.34 elev= +2.0 )
AL_20150621_220332653_000000_00000001    49 stars filter C [  903.5s -   993.5s] expo= 90s elev=44.2deg humid= 89% sunelev=-19.6deg (moon at 131.0deg phase=0.34 elev= +1.0 )
AL_20150621_220513841_000000_00000001    58 stars filter C [ 1004.7s -  1094.7s] expo= 90s elev=44.5deg humid= 88% sunelev=-19.7deg (moon at 131.0deg phase=0.34 elev= +1.0 )
AL_20150621_220655278_000000_00000001    36 stars filter R [ 1106.1s -  1196.1s] expo= 90s elev=44.8deg humid= 87% sunelev=-19.9deg (moon at 131.0deg phase=0.34 elev= +1.0 )
AL_20150621_220836731_000000_00000001    66 stars filter C [ 1207.6s -  1297.6s] expo= 90s elev=45.1deg humid= 86% sunelev=-20.0deg (moon at 131.0deg phase=0.34 elev= +0.0 )
AL_20150621_221018201_000000_00000001    71 stars filter C [ 1309.0s -  1399.0s] expo= 90s elev=45.4deg humid= 84% sunelev=-20.1deg (moon at 131.0deg phase=0.34 elev= +0.0 )
AL_20150621_221029842_000000_00000001     0 star  filter R [ 1410.3s -  1500.3s] expo= 90s elev=45.7deg humid= 82% sunelev=-20.2deg (moon at 131.0deg phase=0.34 elev= +0.0 )
AL_20150621_225103222_000003_46620701    81 stars filter C [ 3664.1s -  3844.1s] expo=180s elev=52.6deg humid= 91% sunelev=-22.0deg (moon at 131.0deg phase=0.35 elev= -6.0 )
AL_20150621_225413940_000003_46620701    71 stars filter C [ 3854.8s -  4034.8s] expo=180s elev=53.2deg humid= 91% sunelev=-22.1deg (moon at 131.0deg phase=0.35 elev= -6.0 )
AL_20150621_225725425_000003_46620701    64 stars filter R [ 4046.3s -  4226.3s] expo=180s elev=53.7deg humid= 92% sunelev=-22.2deg (moon at 131.0deg phase=0.35 elev= -7.0 )
AL_20150621_230045050_000003_46620801    80 stars filter C [ 4245.8s -  4425.8s] expo=180s elev=54.3deg humid= 92% sunelev=-22.3deg (moon at 131.0deg phase=0.35 elev= -7.0 )
AL_20150621_230356425_000003_46620801    73 stars filter C [ 4437.3s -  4617.3s] expo=180s elev=54.9deg humid= 92% sunelev=-22.4deg (moon at 131.0deg phase=0.35 elev= -8.0 )
AL_20150621_230707629_000003_46620801    67 stars filter R [ 4628.5s -  4808.5s] expo=180s elev=55.5deg humid= 92% sunelev=-22.5deg (moon at 131.0deg phase=0.35 elev= -9.0 )
AL_20150621_231028894_000003_46620901    73 stars filter C [ 4829.7s -  5009.7s] expo=180s elev=56.1deg humid= 91% sunelev=-22.6deg (moon at 131.0deg phase=0.35 elev= -9.0 )
AL_20150621_231340275_000003_46620901    85 stars filter C [ 5021.1s -  5201.1s] expo=180s elev=56.7deg humid= 91% sunelev=-22.6deg (moon at 131.0deg phase=0.35 elev=-10.0 )
AL_20150621_231650791_000003_46620901    67 stars filter R [ 5211.6s -  5391.6s] expo=180s elev=57.2deg humid= 90% sunelev=-22.7deg (moon at 131.0deg phase=0.35 elev=-10.0 )
AL_20150621_232012900_000003_46621001    81 stars filter C [ 5413.7s -  5593.7s] expo=180s elev=57.9deg humid= 91% sunelev=-22.7deg (moon at 131.0deg phase=0.35 elev=-11.0 )
AL_20150621_232324328_000003_46621001    82 stars filter C [ 5605.2s -  5785.2s] expo=180s elev=58.4deg humid= 91% sunelev=-22.7deg (moon at 131.0deg phase=0.35 elev=-11.0 )
AL_20150621_232635781_000003_46621001    62 stars filter R [ 5796.6s -  5976.6s] expo=180s elev=59.0deg humid= 91% sunelev=-22.8deg (moon at 131.0deg phase=0.35 elev=-12.0 )
Informations from GCN notice:
This is a GRB
Date of the alert : 2457195.40757 2015-06-21T21:46:54.048
Decoded useful notice informations.
RA(J2000.0) : 306.015914944 20h24m03s8
DEC(J2000.0) : 33.8538646091 +33d51m13s91
Error radius : 2.6 arcmin

Other pages about TAROT Calern observatory observations

Sum of images.
Differential photometry.

Galactic coordinates

Galactic coordinates : lon=73.107890044 lat=-2.09913949301
NASA/IPAC-Extragalactic-Database tool for calculate an extinction

Extinction from Schlegel et al. (1998, ApJ 500, 525): E(B-V)=0.494
Assuming Rv=3.1: Av=1.637 Ar=1.320 Ai=0.958
extmap.fit: 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
GRBlog
ROTSE last GRB images

Example of a GCNC email for this burst

gcncirc@capella.gsfc.nasa.gov
GRB 150621: 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 150621 detected by INTEGRAL
(trigger 7096) with the TAROT robotic telescope (D=25cm)
located at the Calern observatory, France.

The observations started 19.9s after the GRB trigger
(14.7s after the notice). The elevation of the field increased from
41 degrees above horizon and weather conditions
were XXX.

---- NO
The date of trigger : t0 = 2015-06-21T21:46:54.048

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+19.9s to t0+79.9s : R > 15.1

The second image is 30.0s exposure in tracking mode:
t0+95.0s to t0+125.0s : R > 16.2

We co-added a series of exposures:
t0+95.0s to t0+389.0s : 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 19.9s 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= 73.1079 lat= -2.0991
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.
======================================================================