GRB140521_599546_SWIFT at TAROT Calern observatory

TAROT Calern observatory log of images

AL_20140521_200003204_000003_14143901     0 star  filter C [72259773.3s - 72259953.3s] expo=180s elev=26.7deg humid= 58% sunelev=-9.8deg (moon at  74.0deg phase=0.48 elev=-44.0 )
AL_20140521_200313939_000003_14143901     0 star  filter C [72259964.0s - 72260144.0s] expo=180s elev=26.8deg humid= 58% sunelev=-10.3deg (moon at  74.0deg phase=0.48 elev=-43.0 )
AL_20140521_200625407_000003_14143901     4 stars filter R [72260155.4s - 72260335.4s] expo=180s elev=27.0deg humid= 57% sunelev=-10.7deg (moon at  74.0deg phase=0.48 elev=-43.0 )
AL_20140521_200950487_000003_14144001     5 stars filter C [72260360.6s - 72260540.6s] expo=180s elev=27.2deg humid= 58% sunelev=-11.1deg (moon at  74.0deg phase=0.48 elev=-42.0 )
AL_20140521_201302393_000003_14144001     5 stars filter C [72260552.5s - 72260732.5s] expo=180s elev=27.4deg humid= 57% sunelev=-11.6deg (moon at  74.0deg phase=0.48 elev=-42.0 )
AL_20140521_201613878_000003_14144001     4 stars filter R [72260743.9s - 72260923.9s] expo=180s elev=27.6deg humid= 58% sunelev=-12.0deg (moon at  74.0deg phase=0.48 elev=-41.0 )
AL_20140521_201934868_000003_14144101     7 stars filter C [72260944.9s - 72261124.9s] expo=180s elev=27.8deg humid= 58% sunelev=-12.4deg (moon at  74.0deg phase=0.48 elev=-41.0 )
AL_20140521_202245587_000003_14144101    12 stars filter C [72261135.6s - 72261315.6s] expo=180s elev=28.0deg humid= 58% sunelev=-12.8deg (moon at  74.0deg phase=0.48 elev=-41.0 )
AL_20140521_202555868_000003_14144101     7 stars filter R [72261325.9s - 72261505.9s] expo=180s elev=28.2deg humid= 59% sunelev=-13.2deg (moon at  74.0deg phase=0.48 elev=-40.0 )
AL_20140521_202919139_000003_14144201    14 stars filter C [72261529.2s - 72261709.2s] expo=180s elev=28.4deg humid= 59% sunelev=-13.7deg (moon at  74.0deg phase=0.48 elev=-40.0 )
AL_20140521_203230592_000003_14144201    16 stars filter C [72261720.6s - 72261900.6s] expo=180s elev=28.6deg humid= 60% sunelev=-14.0deg (moon at  74.0deg phase=0.48 elev=-39.0 )
AL_20140521_203541357_000003_14144201     5 stars filter R [72261911.4s - 72262091.4s] expo=180s elev=28.8deg humid= 61% sunelev=-14.4deg (moon at  74.0deg phase=0.48 elev=-39.0 )
AL_20140521_203903440_000003_14144301    16 stars filter C [72262113.5s - 72262293.5s] expo=180s elev=29.0deg humid= 62% sunelev=-14.8deg (moon at  74.0deg phase=0.48 elev=-38.0 )
AL_20140521_204214221_000003_14144301    15 stars filter C [72262304.3s - 72262484.3s] expo=180s elev=29.2deg humid= 62% sunelev=-15.2deg (moon at  74.0deg phase=0.48 elev=-38.0 )
AL_20140521_204525596_000003_14144301    13 stars filter R [72262495.7s - 72262675.7s] expo=180s elev=29.4deg humid= 61% sunelev=-15.6deg (moon at  74.0deg phase=0.48 elev=-37.0 )
AL_20140521_204847554_000003_14144401    17 stars filter C [72262697.6s - 72262877.6s] expo=180s elev=29.7deg humid= 61% sunelev=-16.0deg (moon at  74.0deg phase=0.48 elev=-37.0 )
AL_20140521_205158320_000003_14144401    20 stars filter C [72262888.3s - 72263068.3s] expo=180s elev=29.9deg humid= 61% sunelev=-16.3deg (moon at  74.0deg phase=0.47 elev=-36.0 )
AL_20140521_205509679_000003_14144401    12 stars filter R [72263079.8s - 72263259.8s] expo=180s elev=30.1deg humid= 61% sunelev=-16.7deg (moon at  74.0deg phase=0.47 elev=-36.0 )
AL_20140521_205831851_000003_14144501    15 stars filter C [72263281.9s - 72263461.9s] expo=180s elev=30.3deg humid= 59% sunelev=-17.1deg (moon at  74.0deg phase=0.47 elev=-35.0 )
AL_20140521_210142558_000003_14144501    20 stars filter C [72263472.6s - 72263652.6s] expo=180s elev=30.5deg humid= 61% sunelev=-17.4deg (moon at  74.0deg phase=0.47 elev=-35.0 )
AL_20140521_210453136_000003_14144501    13 stars filter R [72263663.2s - 72263843.2s] expo=180s elev=30.8deg humid= 59% sunelev=-17.8deg (moon at  74.0deg phase=0.47 elev=-34.0 )
AL_20140521_210815230_000003_14144601    20 stars filter C [72263865.3s - 72264045.3s] expo=180s elev=31.0deg humid= 59% sunelev=-18.1deg (moon at  74.0deg phase=0.47 elev=-34.0 )
AL_20140521_211126686_000003_14144601    17 stars filter C [72264056.7s - 72264236.7s] expo=180s elev=31.2deg humid= 59% sunelev=-18.4deg (moon at  74.0deg phase=0.47 elev=-33.0 )
AL_20140521_211437436_000003_14144601    15 stars filter R [72264247.5s - 72264427.5s] expo=180s elev=31.5deg humid= 59% sunelev=-18.8deg (moon at  74.0deg phase=0.47 elev=-33.0 )
AL_20140521_211759265_000003_14144701    19 stars filter C [72264449.4s - 72264629.4s] expo=180s elev=31.7deg humid= 59% sunelev=-19.1deg (moon at  74.0deg phase=0.47 elev=-32.0 )
AL_20140521_212110784_000003_14144701    19 stars filter C [72264640.8s - 72264820.8s] expo=180s elev=31.9deg humid= 58% sunelev=-19.4deg (moon at  74.0deg phase=0.47 elev=-32.0 )
AL_20140521_212421456_000003_14144701    14 stars filter R [72264831.5s - 72265011.5s] expo=180s elev=32.2deg humid= 58% sunelev=-19.7deg (moon at  74.0deg phase=0.47 elev=-31.0 )
AL_20140521_212743159_000003_14144801    19 stars filter C [72265033.2s - 72265213.2s] expo=180s elev=32.4deg humid= 58% sunelev=-20.0deg (moon at  74.0deg phase=0.47 elev=-31.0 )
AL_20140521_213054835_000003_14144801    16 stars filter C [72265224.9s - 72265404.9s] expo=180s elev=32.7deg humid= 58% sunelev=-20.3deg (moon at  74.0deg phase=0.47 elev=-30.0 )
AL_20140521_213406304_000003_14144801     4 stars filter R [72265416.3s - 72265596.3s] expo=180s elev=32.9deg humid= 58% sunelev=-20.6deg (moon at  74.0deg phase=0.47 elev=-30.0 )
AL_20140521_213727195_000003_14144901     5 stars filter C [72265617.3s - 72265797.3s] expo=180s elev=33.2deg humid= 58% sunelev=-20.9deg (moon at  74.0deg phase=0.47 elev=-29.0 )
AL_20140521_214038685_000003_14144901     2 stars filter C [72265808.7s - 72265988.7s] expo=180s elev=33.4deg humid= 58% sunelev=-21.2deg (moon at  74.0deg phase=0.47 elev=-29.0 )
AL_20140521_214349435_000003_14144901     2 stars filter R [72265999.5s - 72266179.5s] expo=180s elev=33.7deg humid= 58% sunelev=-21.4deg (moon at  74.0deg phase=0.47 elev=-28.0 )
AL_20140521_214711778_000003_14145001     4 stars filter C [72266201.8s - 72266381.8s] expo=180s elev=33.9deg humid= 57% sunelev=-21.7deg (moon at  74.0deg phase=0.47 elev=-28.0 )
AL_20140521_215022283_000003_14145001    19 stars filter C [72266392.3s - 72266572.3s] expo=180s elev=34.2deg humid= 57% sunelev=-21.9deg (moon at  74.0deg phase=0.47 elev=-27.0 )
AL_20140521_215333002_000003_14145001    13 stars filter R [72266583.1s - 72266763.1s] expo=180s elev=34.4deg humid= 57% sunelev=-22.2deg (moon at  74.0deg phase=0.47 elev=-27.0 )
AL_20140521_220904334_000003_14145101    20 stars filter C [72267514.4s - 72267694.4s] expo=180s elev=35.7deg humid= 56% sunelev=-23.3deg (moon at  74.0deg phase=0.47 elev=-24.0 )
AL_20140521_221215103_000003_14145101    13 stars filter R [72267705.1s - 72267885.1s] expo=180s elev=36.0deg humid= 56% sunelev=-23.5deg (moon at  74.0deg phase=0.47 elev=-23.0 )
AL_20140521_221525837_000003_14145101     8 stars filter V [72267895.9s - 72268075.9s] expo=180s elev=36.2deg humid= 56% sunelev=-23.7deg (moon at  74.0deg phase=0.47 elev=-23.0 )
AL_20140521_223320330_000003_14145201    24 stars filter C [72268970.4s - 72269150.4s] expo=180s elev=37.8deg humid= 57% sunelev=-24.6deg (moon at  74.0deg phase=0.47 elev=-20.0 )
AL_20140521_223630892_000003_14145201    16 stars filter R [72269160.9s - 72269340.9s] expo=180s elev=38.0deg humid= 57% sunelev=-24.8deg (moon at  74.0deg phase=0.47 elev=-19.0 )
AL_20140521_223941877_000003_14145201     8 stars filter V [72269351.9s - 72269531.9s] expo=180s elev=38.3deg humid= 56% sunelev=-24.9deg (moon at  74.0deg phase=0.47 elev=-19.0 )
AL_20140521_225755964_000003_14145301    20 stars filter C [72270446.0s - 72270626.0s] expo=180s elev=39.9deg humid= 61% sunelev=-25.5deg (moon at  74.0deg phase=0.47 elev=-16.0 )
AL_20140521_230106453_000003_14145301    14 stars filter R [72270636.5s - 72270816.5s] expo=180s elev=40.2deg humid= 63% sunelev=-25.6deg (moon at  74.0deg phase=0.47 elev=-15.0 )
AL_20140521_230417249_000003_14145301     6 stars filter V [72270827.3s - 72271007.3s] expo=180s elev=40.5deg humid= 64% sunelev=-25.7deg (moon at  74.0deg phase=0.47 elev=-15.0 )
AL_20140521_232220430_000003_14145401    16 stars filter C [72271910.5s - 72272090.5s] expo=180s elev=42.2deg humid= 67% sunelev=-25.9deg (moon at  74.0deg phase=0.47 elev=-11.0 )
AL_20140521_232530945_000003_14145401    12 stars filter R [72272101.0s - 72272281.0s] expo=180s elev=42.5deg humid= 66% sunelev=-26.0deg (moon at  74.0deg phase=0.47 elev=-11.0 )
AL_20140521_232841914_000003_14145401     5 stars filter V [72272292.0s - 72272472.0s] expo=180s elev=42.7deg humid= 66% sunelev=-26.0deg (moon at  74.0deg phase=0.47 elev=-10.0 )
AL_20140521_234654375_000003_14145501    17 stars filter C [72273384.4s - 72273564.4s] expo=180s elev=44.4deg humid= 64% sunelev=-25.9deg (moon at  74.0deg phase=0.47 elev= -7.0 )
AL_20140521_235005109_000003_14145501     8 stars filter R [72273575.2s - 72273755.2s] expo=180s elev=44.7deg humid= 63% sunelev=-25.8deg (moon at  74.0deg phase=0.46 elev= -6.0 )
AL_20140521_235316115_000003_14145501     4 stars filter V [72273766.2s - 72273946.2s] expo=180s elev=45.0deg humid= 63% sunelev=-25.8deg (moon at  74.0deg phase=0.46 elev= -6.0 )
Informations from GCN notice:
This is not a GRB (a retractation has been edited)
Date of GRB : 2455962.9912571758 2012-02-05T11:47:24.620
Date of notice : 2455962.9915046296 2012-02-05T11:47:46.000
Refined position : no
RA(J2000.0) : 40.1 02h40m24s0
DEC(J2000.0) : 61.22 +61d13m12s00
Error box : x=-34992:-34882 y=19298:19407 (pixels)

Other pages about TAROT Calern observatory observations

Status of this alert received by TAROT Calern observatory.
Sum of images.
Differential photometry.

Galactic coordinates

Galactic coordinates : lon=104.806638738 lat=12.5192998883
NASA/IPAC-Extragalactic-Database tool for calculate an extinction

Extinction from Schlegel et al. (1998, ApJ 500, 525): E(B-V)=0.763
Assuming Rv=3.1: Av=2.528 Ar=2.039 Ai=1.480 Extinction map E(B-V) from Schlegel:

Field of View is about 62 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 140521: TAROT Calern observatory optical observations
Klotz A. (IRAP-CNRS-OMP), Gendre B. (IRAP-CNRS-OMP),
Boer M., Siellez K., Dereli H., Bardho O. (UNS-CNRS-OCA),
Atteia J.L. (IRAP-CNRS-OMP) report:

We imaged the field of GRB 140521 detected by SWIFT
(trigger 513505) with the TAROT robotic telescope (D=25cm)
located at the Calern observatory, France.

The observations started 72259773.3s after the GRB trigger
(72259752.1s after the notice). The elevation of the field increased from
26 degrees above horizon and weather conditions
were XXX.

---- NO
The date of trigger : t0 = 2012-02-05T11:47:24.864

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+72259773.3s to t0+72259953.3s : R > 15.1

The second image is 180.0s exposure in tracking mode:
t0+72259964.0s to t0+72260144.0s : R > 16.2

We co-added a series of exposures:
t0+72259964.0s to t0+72261124.9s : 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 72259773.3s 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=104.8066 lat=+12.5193
and the galactic extinction in R band is 2.0 magnitudes
estimated from D. Schlegel et al. 1998ApJ...500..525S.

This message may be cited.