GRB140907_611933_SWIFT at TAROT Calern observatory

TAROT Calern observatory log of images

AL_20140907_185121077_000003_23305001     0 star  filter C [81673251.1s - 81673431.1s] expo=180s elev= 9.8deg humid= 88% sunelev=-9.8deg (moon at  90.0deg phase=0.90 elev=+18.0 )
AL_20140907_185431843_000003_23305001     1 star  filter C [81673441.9s - 81673621.9s] expo=180s elev=10.1deg humid= 89% sunelev=-10.4deg (moon at  90.0deg phase=0.90 elev=+19.0 )
AL_20140907_185742831_000003_23305001     0 star  filter R [81673632.9s - 81673812.9s] expo=180s elev=10.4deg humid= 89% sunelev=-10.9deg (moon at  90.0deg phase=0.90 elev=+19.0 )
AL_20140907_190110722_000003_23305101     1 star  filter C [81673840.8s - 81674020.8s] expo=180s elev=10.8deg humid= 89% sunelev=-11.5deg (moon at  90.0deg phase=0.90 elev=+20.0 )
AL_20140907_190421503_000003_23305101     0 star  filter C [81674031.5s - 81674211.5s] expo=180s elev=11.1deg humid= 89% sunelev=-12.0deg (moon at  90.0deg phase=0.90 elev=+20.0 )
AL_20140907_190732483_000003_23305101     0 star  filter R [81674222.5s - 81674402.5s] expo=180s elev=11.4deg humid= 88% sunelev=-12.6deg (moon at  90.0deg phase=0.90 elev=+21.0 )
AL_20140907_194954689_000003_23305601    17 stars filter C [81676764.7s - 81676944.7s] expo=180s elev=15.9deg humid= 91% sunelev=-19.5deg (moon at  89.0deg phase=0.90 elev=+26.0 )
AL_20140907_195305876_000003_23305601    12 stars filter C [81676955.9s - 81677135.9s] expo=180s elev=16.3deg humid= 90% sunelev=-20.0deg (moon at  89.0deg phase=0.90 elev=+27.0 )
AL_20140907_195616876_000003_23305601    17 stars filter R [81677146.9s - 81677326.9s] expo=180s elev=16.6deg humid= 90% sunelev=-20.5deg (moon at  89.0deg phase=0.90 elev=+27.0 )
AL_20140907_195943423_000003_23305701    20 stars filter C [81677353.5s - 81677533.5s] expo=180s elev=17.0deg humid= 91% sunelev=-21.0deg (moon at  89.0deg phase=0.90 elev=+28.0 )
AL_20140907_200254173_000003_23305701    24 stars filter C [81677544.2s - 81677724.2s] expo=180s elev=17.4deg humid= 91% sunelev=-21.5deg (moon at  89.0deg phase=0.90 elev=+28.0 )
AL_20140907_200605595_000003_23305701    15 stars filter R [81677735.6s - 81677915.6s] expo=180s elev=17.8deg humid= 91% sunelev=-22.0deg (moon at  89.0deg phase=0.90 elev=+28.0 )
AL_20140907_200921397_000003_23305801    25 stars filter C [81677931.5s - 81678111.5s] expo=180s elev=18.2deg humid= 91% sunelev=-22.5deg (moon at  89.0deg phase=0.90 elev=+29.0 )
AL_20140907_201232209_000003_23305801    22 stars filter C [81678122.3s - 81678302.3s] expo=180s elev=18.6deg humid= 90% sunelev=-23.0deg (moon at  89.0deg phase=0.90 elev=+29.0 )
AL_20140907_201543194_000003_23305801    22 stars filter R [81678313.2s - 81678493.2s] expo=180s elev=19.0deg humid= 90% sunelev=-23.4deg (moon at  89.0deg phase=0.90 elev=+29.0 )
AL_20140907_201902510_000003_23305901    16 stars filter C [81678512.6s - 81678692.6s] expo=180s elev=19.4deg humid= 88% sunelev=-23.9deg (moon at  89.0deg phase=0.90 elev=+30.0 )
AL_20140907_202212994_000003_23305901    20 stars filter C [81678703.1s - 81678883.1s] expo=180s elev=19.8deg humid= 88% sunelev=-24.4deg (moon at  89.0deg phase=0.90 elev=+30.0 )
AL_20140907_202524275_000003_23305901    22 stars filter R [81678894.3s - 81679074.3s] expo=180s elev=20.2deg humid= 89% sunelev=-24.9deg (moon at  89.0deg phase=0.90 elev=+30.0 )
AL_20140907_202847294_000003_23306001    24 stars filter C [81679097.3s - 81679277.3s] expo=180s elev=20.6deg humid= 90% sunelev=-25.4deg (moon at  89.0deg phase=0.90 elev=+31.0 )
AL_20140907_203158059_000003_23306001    23 stars filter C [81679288.1s - 81679468.1s] expo=180s elev=21.0deg humid= 91% sunelev=-25.8deg (moon at  89.0deg phase=0.90 elev=+31.0 )
AL_20140907_203508981_000003_23306001    23 stars filter R [81679479.1s - 81679659.1s] expo=180s elev=21.4deg humid= 92% sunelev=-26.3deg (moon at  89.0deg phase=0.90 elev=+31.0 )
AL_20140907_205005955_000003_23306101    27 stars filter C [81680376.0s - 81680556.0s] expo=180s elev=23.3deg humid= 93% sunelev=-28.3deg (moon at  89.0deg phase=0.90 elev=+33.0 )
AL_20140907_205316673_000003_23306101    19 stars filter R [81680566.7s - 81680746.7s] expo=180s elev=23.8deg humid= 93% sunelev=-28.7deg (moon at  89.0deg phase=0.90 elev=+33.0 )
AL_20140907_205627455_000003_23306101    15 stars filter V [81680757.5s - 81680937.5s] expo=180s elev=24.2deg humid= 93% sunelev=-29.1deg (moon at  89.0deg phase=0.90 elev=+33.0 )
AL_20140907_220333146_000003_23306401    39 stars filter C [81684783.2s - 81684963.2s] expo=180s elev=33.7deg humid= 90% sunelev=-36.4deg (moon at  88.0deg phase=0.91 elev=+37.0 )
AL_20140907_220643865_000003_23306401    30 stars filter R [81684973.9s - 81685153.9s] expo=180s elev=34.1deg humid= 90% sunelev=-36.7deg (moon at  88.0deg phase=0.91 elev=+37.0 )
AL_20140907_220955068_000003_23306401    24 stars filter V [81685165.1s - 81685345.1s] expo=180s elev=34.6deg humid= 90% sunelev=-37.0deg (moon at  88.0deg phase=0.91 elev=+37.0 )
AL_20140907_222714995_000003_23306501     0 star  filter C [81686257.0s - 81686437.0s] expo=180s elev=37.4deg humid= 93% sunelev=-38.3deg (moon at  88.0deg phase=0.91 elev=+37.0 )
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=4339:4449 y=15494:15604 (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=146.677199317 lat=-9.66640334438
NASA/IPAC-Extragalactic-Database tool for calculate an extinction

Extinction from Schlegel et al. (1998, ApJ 500, 525): E(B-V)=0.590
Assuming Rv=3.1: Av=1.957 Ar=1.578 Ai=1.145 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 140907: 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 140907 detected by SWIFT
(trigger 513505) with the TAROT robotic telescope (D=25cm)
located at the Calern observatory, France.

The observations started 81673251.1s after the GRB trigger
(81673230.0s after the notice). The elevation of the field increased from
9 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+81673251.1s to t0+81673431.1s : R > 15.1

The second image is 180.0s exposure in tracking mode:
t0+81673441.9s to t0+81673621.9s : R > 16.2

We co-added a series of exposures:
t0+81673441.9s to t0+81676944.7s : 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 81673251.1s 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=146.6772 lat= -9.6664
and the galactic extinction in R band is 1.6 magnitudes
estimated from D. Schlegel et al. 1998ApJ...500..525S.

This message may be cited.