GRB160220_012526_SWIFT at TAROT Calern observatory

TAROT Calern observatory log of images

AL_20160220_030639857_000000_13047001    14 stars filter C [ 5888.7s -  6068.7s] expo=180s elev=20.2deg humid= 35% sunelev=-36.4deg (moon at 119.0deg phase=0.83 elev=+16.0 )
AL_20160220_030950841_000000_13047001    13 stars filter C [ 6079.6s -  6259.6s] expo=180s elev=20.5deg humid= 35% sunelev=-35.9deg (moon at 119.0deg phase=0.83 elev=+15.0 )
AL_20160220_031302301_000000_13047001    11 stars filter R [ 6271.1s -  6451.1s] expo=180s elev=20.8deg humid= 35% sunelev=-35.4deg (moon at 119.0deg phase=0.83 elev=+15.0 )
AL_20160220_031619519_000000_13047101    11 stars filter C [ 6468.3s -  6648.3s] expo=180s elev=21.1deg humid= 36% sunelev=-34.8deg (moon at 119.0deg phase=0.83 elev=+14.0 )
AL_20160220_031930488_000000_13047101    15 stars filter C [ 6659.3s -  6839.3s] expo=180s elev=21.4deg humid= 37% sunelev=-34.3deg (moon at 119.0deg phase=0.83 elev=+14.0 )
AL_20160220_032241957_000000_13047101     8 stars filter R [ 6850.8s -  7030.8s] expo=180s elev=21.7deg humid= 37% sunelev=-33.7deg (moon at 119.0deg phase=0.83 elev=+13.0 )
AL_20160220_032603844_000000_13047201    13 stars filter C [ 7052.6s -  7232.6s] expo=180s elev=22.0deg humid= 38% sunelev=-33.1deg (moon at 119.0deg phase=0.83 elev=+13.0 )
AL_20160220_032914813_000000_13047201    12 stars filter C [ 7243.6s -  7423.6s] expo=180s elev=22.3deg humid= 39% sunelev=-32.6deg (moon at 118.0deg phase=0.83 elev=+12.0 )
AL_20160220_033225813_000000_13047201     8 stars filter R [ 7434.6s -  7614.6s] expo=180s elev=22.6deg humid= 39% sunelev=-32.0deg (moon at 118.0deg phase=0.83 elev=+11.0 )
AL_20160220_033547674_000000_13047301    15 stars filter C [ 7636.5s -  7816.5s] expo=180s elev=22.9deg humid= 39% sunelev=-31.5deg (moon at 118.0deg phase=0.83 elev=+11.0 )
AL_20160220_033858674_000000_13047301    14 stars filter C [ 7827.5s -  8007.5s] expo=180s elev=23.2deg humid= 39% sunelev=-30.9deg (moon at 118.0deg phase=0.83 elev=+10.0 )
AL_20160220_034209659_000000_13047301    11 stars filter R [ 8018.5s -  8198.5s] expo=180s elev=23.4deg humid= 41% sunelev=-30.4deg (moon at 118.0deg phase=0.83 elev=+10.0 )
AL_20160220_034531998_000000_13047401    17 stars filter C [ 8220.8s -  8400.8s] expo=180s elev=23.7deg humid= 42% sunelev=-29.8deg (moon at 118.0deg phase=0.83 elev= +9.0 )
AL_20160220_034842498_000000_13047401    14 stars filter C [ 8411.3s -  8591.3s] expo=180s elev=23.9deg humid= 42% sunelev=-29.2deg (moon at 118.0deg phase=0.83 elev= +9.0 )
AL_20160220_035153732_000000_13047401    12 stars filter R [ 8602.5s -  8782.5s] expo=180s elev=24.2deg humid= 41% sunelev=-28.6deg (moon at 118.0deg phase=0.83 elev= +8.0 )
AL_20160220_035515823_000000_13047501    15 stars filter C [ 8804.6s -  8984.6s] expo=180s elev=24.4deg humid= 40% sunelev=-28.0deg (moon at 118.0deg phase=0.83 elev= +7.0 )
AL_20160220_035826807_000000_13047501    19 stars filter C [ 8995.6s -  9175.6s] expo=180s elev=24.6deg humid= 40% sunelev=-27.5deg (moon at 118.0deg phase=0.83 elev= +7.0 )
AL_20160220_040138026_000000_13047501    14 stars filter R [ 9186.8s -  9366.8s] expo=180s elev=24.9deg humid= 42% sunelev=-26.9deg (moon at 118.0deg phase=0.83 elev= +6.0 )
AL_20160220_040500141_000000_13047601    15 stars filter C [ 9389.0s -  9569.0s] expo=180s elev=25.1deg humid= 42% sunelev=-26.3deg (moon at 118.0deg phase=0.83 elev= +6.0 )
AL_20160220_040811094_000000_13047601    18 stars filter C [ 9579.9s -  9759.9s] expo=180s elev=25.3deg humid= 43% sunelev=-25.7deg (moon at 118.0deg phase=0.83 elev= +5.0 )
AL_20160220_041122110_000000_13047601    11 stars filter R [ 9770.9s -  9950.9s] expo=180s elev=25.5deg humid= 42% sunelev=-25.2deg (moon at 118.0deg phase=0.83 elev= +5.0 )
AL_20160220_041452372_000000_13047701    18 stars filter C [ 9981.2s - 10161.2s] expo=180s elev=25.7deg humid= 42% sunelev=-24.6deg (moon at 118.0deg phase=0.83 elev= +4.0 )
AL_20160220_041803090_000000_13047701    18 stars filter C [10171.9s - 10351.9s] expo=180s elev=25.9deg humid= 43% sunelev=-24.0deg (moon at 118.0deg phase=0.83 elev= +4.0 )
AL_20160220_042114075_000000_13047701    13 stars filter R [10362.9s - 10542.9s] expo=180s elev=26.0deg humid= 44% sunelev=-23.4deg (moon at 118.0deg phase=0.83 elev= +3.0 )
AL_20160220_042430163_000000_13047801    19 stars filter C [10559.0s - 10739.0s] expo=180s elev=26.2deg humid= 43% sunelev=-22.8deg (moon at 118.0deg phase=0.83 elev= +3.0 )
AL_20160220_042741116_000000_13047801    17 stars filter C [10749.9s - 10929.9s] expo=180s elev=26.3deg humid= 43% sunelev=-22.3deg (moon at 118.0deg phase=0.83 elev= +2.0 )
AL_20160220_043052085_000000_13047801    17 stars filter R [10940.9s - 11120.9s] expo=180s elev=26.5deg humid= 42% sunelev=-21.7deg (moon at 118.0deg phase=0.83 elev= +2.0 )
AL_20160220_043420251_000000_13047901    18 stars filter C [11149.1s - 11329.1s] expo=180s elev=26.6deg humid= 42% sunelev=-21.1deg (moon at 118.0deg phase=0.83 elev= +1.0 )
AL_20160220_043731032_000000_13047901    18 stars filter C [11339.8s - 11519.8s] expo=180s elev=26.8deg humid= 42% sunelev=-20.5deg (moon at 118.0deg phase=0.83 elev= +0.0 )
AL_20160220_044042470_000000_13047901    14 stars filter R [11531.3s - 11711.3s] expo=180s elev=26.9deg humid= 43% sunelev=-19.9deg (moon at 118.0deg phase=0.83 elev= +0.0 )
AL_20160220_044358345_000000_13048001    17 stars filter C [11727.1s - 11907.1s] expo=180s elev=27.0deg humid= 42% sunelev=-19.3deg (moon at 118.0deg phase=0.83 elev= +0.0 )
AL_20160220_044709297_000000_13048001    18 stars filter C [11918.1s - 12098.1s] expo=180s elev=27.1deg humid= 42% sunelev=-18.7deg (moon at 118.0deg phase=0.83 elev= +0.0 )
AL_20160220_045020734_000000_13048001    14 stars filter R [12109.6s - 12289.6s] expo=180s elev=27.2deg humid= 42% sunelev=-18.2deg (moon at 118.0deg phase=0.83 elev= -1.0 )
AL_20160220_045802763_000000_13048201    19 stars filter C [12571.6s - 12751.6s] expo=180s elev=27.4deg humid= 41% sunelev=-16.8deg (moon at 118.0deg phase=0.83 elev= -2.0 )
AL_20160220_050114184_000000_13048201    19 stars filter C [12763.0s - 12943.0s] expo=180s elev=27.5deg humid= 42% sunelev=-16.2deg (moon at 118.0deg phase=0.83 elev= -2.0 )
AL_20160220_050424950_000000_13048201    17 stars filter R [12953.7s - 13133.7s] expo=180s elev=27.5deg humid= 42% sunelev=-15.6deg (moon at 118.0deg phase=0.83 elev= -3.0 )
AL_20160220_050749589_000000_13048301    18 stars filter C [13158.4s - 13338.4s] expo=180s elev=27.6deg humid= 41% sunelev=-15.0deg (moon at 118.0deg phase=0.83 elev= -3.0 )
AL_20160220_051100355_000000_13048301    19 stars filter C [13349.2s - 13529.2s] expo=180s elev=27.6deg humid= 41% sunelev=-14.4deg (moon at 118.0deg phase=0.83 elev= -4.0 )
AL_20160220_051411761_000000_13048301    17 stars filter R [13540.4s - 13720.4s] expo=180s elev=27.6deg humid= 41% sunelev=-13.9deg (moon at 117.0deg phase=0.83 elev= -4.0 )
AL_20160220_051733612_000000_13048401    17 stars filter C [13742.3s - 13922.3s] expo=180s elev=27.7deg humid= 41% sunelev=-13.3deg (moon at 117.0deg phase=0.83 elev= -5.0 )
AL_20160220_052044409_000000_13048401    15 stars filter C [13933.0s - 14113.0s] expo=180s elev=27.7deg humid= 40% sunelev=-12.7deg (moon at 117.0deg phase=0.83 elev= -6.0 )
AL_20160220_052355409_000000_13048401    11 stars filter R [14124.2s - 14304.2s] expo=180s elev=27.7deg humid= 40% sunelev=-12.1deg (moon at 117.0deg phase=0.83 elev= -6.0 )
AL_20160220_052718226_000000_13048501    13 stars filter C [14327.0s - 14507.0s] expo=180s elev=27.7deg humid= 40% sunelev=-11.5deg (moon at 117.0deg phase=0.83 elev= -7.0 )
AL_20160220_053029195_000000_13048501     8 stars filter C [14518.0s - 14698.0s] expo=180s elev=27.7deg humid= 40% sunelev=-10.9deg (moon at 117.0deg phase=0.83 elev= -7.0 )
AL_20160220_053340398_000000_13048501     6 stars filter R [14709.2s - 14889.2s] expo=180s elev=27.6deg humid= 40% sunelev=-10.3deg (moon at 117.0deg phase=0.83 elev= -7.0 )
AL_20160220_053701850_000000_13048601     0 star  filter C [14910.7s - 15090.7s] expo=180s elev=27.6deg humid= 41% sunelev=-9.7deg (moon at 117.0deg phase=0.83 elev= -8.0 )
AL_20160220_054012334_000000_13048601     0 star  filter C [15101.2s - 15281.2s] expo=180s elev=27.6deg humid= 41% sunelev=-9.2deg (moon at 117.0deg phase=0.83 elev= -8.0 )
AL_20160220_054323803_000000_13048601     0 star  filter R [15292.6s - 15472.6s] expo=180s elev=27.5deg humid= 42% sunelev=-8.6deg (moon at 117.0deg phase=0.83 elev= -9.0 )
Informations from GCN notice:
This is a GRB
Date of the alert : 2457438.55933 2016-02-20T01:25:26.112
Decoded useful notice informations.
RA(J2000.0) : 236.9516 15h47m48s3
DEC(J2000.0) : -18.565 -18d33m53s99
Error radius : 3.6 arcsec
Error box : x=35:38 y=52:55 (pixels)

Other pages about TAROT Calern observatory observations

Sum of images.
Differential photometry.

Galactic coordinates

Galactic coordinates : lon=350.924223513 lat=27.4615082864
NASA/IPAC-Extragalactic-Database tool for calculate an extinction

Extinction from Schlegel et al. (1998, ApJ 500, 525): E(B-V)=0.136
Assuming Rv=3.1: Av=0.451 Ar=0.364 Ai=0.264
extmap.fit: Extinction map E(B-V) from Schlegel:

Field of View is about 75 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 160220: 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 160220 detected by SWIFT
(trigger 674670) with the TAROT robotic telescope (D=25cm)
located at the Calern observatory, France.

The observations started 1.64h after the GRB trigger.
The elevation of the field increased from
20 degrees above horizon and weather conditions
were XXX.

---- NO
The date of trigger : t0 = 2016-02-20T01:25:26.112

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+5888.7s to t0+6068.7s : R > 15.1

The second image is 180.0s exposure in tracking mode:
t0+6079.6s to t0+6259.6s : R > 16.2

We co-added a series of exposures:
t0+6079.6s to t0+7232.6s : 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 1.64h 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=350.9242 lat=+27.4615
and the galactic extinction in R band is 0.4 magnitudes
estimated from D. Schlegel et al. 1998ApJ...500..525S.

This message may be cited.
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