GRB121202_042005_SWIFT at TAROT Calern observatory

TAROT Calern observatory log of images

AL_20121202_042143932_000000_00000001     0 star  filter C [   34.0s -    94.0s] expo= 60s elev= 1.5deg humid= 56% sunelev=-25.7deg (moon at 127.0deg phase=0.79 elev=+51.0 )
AL_20121202_042229759_000000_00000001     0 star  filter C [  109.8s -   139.8s] expo= 30s elev= 1.6deg humid= 55% sunelev=-25.4deg (moon at 127.0deg phase=0.79 elev=+50.0 )
AL_20121202_042311134_000000_00000001     0 star  filter C [  151.3s -   181.3s] expo= 30s elev= 1.7deg humid= 55% sunelev=-25.3deg (moon at 127.0deg phase=0.79 elev=+50.0 )
AL_20121202_042352245_000000_00000001     0 star  filter C [  192.2s -   222.2s] expo= 30s elev= 1.8deg humid= 55% sunelev=-25.2deg (moon at 127.0deg phase=0.79 elev=+50.0 )
AL_20121202_042433623_000000_00000001     0 star  filter C [  233.7s -   263.7s] expo= 30s elev= 1.9deg humid= 55% sunelev=-25.1deg (moon at 127.0deg phase=0.79 elev=+50.0 )
AL_20121202_042515060_000000_00000001     1 star  filter C [  275.1s -   305.1s] expo= 30s elev= 2.0deg humid= 55% sunelev=-24.9deg (moon at 127.0deg phase=0.79 elev=+50.0 )
AL_20121202_042656012_000000_00000001     2 stars filter C [  316.1s -   406.1s] expo= 90s elev= 2.1deg humid= 55% sunelev=-24.8deg (moon at 127.0deg phase=0.79 elev=+50.0 )
AL_20121202_042837013_000000_00000001     2 stars filter C [  417.1s -   507.1s] expo= 90s elev= 2.4deg humid= 55% sunelev=-24.5deg (moon at 127.0deg phase=0.79 elev=+50.0 )
AL_20121202_043018482_000000_00000001     1 star  filter R [  518.5s -   608.5s] expo= 90s elev= 2.6deg humid= 55% sunelev=-24.2deg (moon at 127.0deg phase=0.78 elev=+49.0 )
AL_20121202_043159638_000000_00000001     4 stars filter C [  619.7s -   709.7s] expo= 90s elev= 2.9deg humid= 55% sunelev=-23.9deg (moon at 127.0deg phase=0.78 elev=+49.0 )
AL_20121202_043341326_000000_00000001     4 stars filter C [  721.4s -   811.4s] expo= 90s elev= 3.1deg humid= 56% sunelev=-23.6deg (moon at 127.0deg phase=0.78 elev=+49.0 )
AL_20121202_043522531_000000_00000001     3 stars filter R [  822.6s -   912.6s] expo= 90s elev= 3.4deg humid= 56% sunelev=-23.3deg (moon at 127.0deg phase=0.78 elev=+49.0 )
AL_20121202_043704032_000000_00000001     4 stars filter C [  924.1s -  1014.1s] expo= 90s elev= 3.6deg humid= 56% sunelev=-23.0deg (moon at 127.0deg phase=0.78 elev=+48.0 )
AL_20121202_043845188_000000_00000001     4 stars filter C [ 1025.3s -  1115.3s] expo= 90s elev= 3.9deg humid= 56% sunelev=-22.7deg (moon at 127.0deg phase=0.78 elev=+48.0 )
AL_20121202_044026890_000000_00000001     0 star  filter R [ 1126.9s -  1216.9s] expo= 90s elev= 4.1deg humid= 56% sunelev=-22.4deg (moon at 127.0deg phase=0.78 elev=+48.0 )
AL_20121202_044208296_000000_00000001     0 star  filter C [ 1228.4s -  1318.4s] expo= 90s elev= 4.4deg humid= 56% sunelev=-22.1deg (moon at 127.0deg phase=0.78 elev=+47.0 )
AL_20121202_044349766_000000_00000001     4 stars filter C [ 1329.8s -  1419.8s] expo= 90s elev= 4.7deg humid= 57% sunelev=-21.8deg (moon at 127.0deg phase=0.78 elev=+47.0 )
AL_20121202_044530954_000000_00000001     5 stars filter R [ 1431.0s -  1521.0s] expo= 90s elev= 4.9deg humid= 57% sunelev=-21.5deg (moon at 127.0deg phase=0.78 elev=+47.0 )
AL_20121202_044712424_000000_00000001     5 stars filter C [ 1532.5s -  1622.5s] expo= 90s elev= 5.2deg humid= 57% sunelev=-21.2deg (moon at 127.0deg phase=0.78 elev=+47.0 )
AL_20121202_045023610_000000_00000001     7 stars filter C [ 1633.7s -  1813.7s] expo=180s elev= 5.6deg humid= 58% sunelev=-20.9deg (moon at 127.0deg phase=0.78 elev=+46.0 )
AL_20121202_045334877_000000_00000001     6 stars filter C [ 1824.9s -  2004.9s] expo=180s elev= 6.1deg humid= 57% sunelev=-20.3deg (moon at 127.0deg phase=0.78 elev=+46.0 )
AL_20121202_045645815_000000_00000001     7 stars filter R [ 2015.9s -  2195.9s] expo=180s elev= 6.6deg humid= 57% sunelev=-19.8deg (moon at 127.0deg phase=0.78 elev=+45.0 )
AL_20121202_045957034_000000_00000001     8 stars filter C [ 2207.1s -  2387.1s] expo=180s elev= 7.1deg humid= 57% sunelev=-19.2deg (moon at 127.0deg phase=0.78 elev=+45.0 )
AL_20121202_050308440_000000_00000001    10 stars filter C [ 2398.5s -  2578.5s] expo=180s elev= 7.6deg humid= 58% sunelev=-18.7deg (moon at 127.0deg phase=0.78 elev=+44.0 )
AL_20121202_050619429_000000_00000001     7 stars filter R [ 2589.5s -  2769.5s] expo=180s elev= 8.1deg humid= 58% sunelev=-18.1deg (moon at 127.0deg phase=0.78 elev=+44.0 )
AL_20121202_050930428_000000_00000001     6 stars filter C [ 2780.5s -  2960.5s] expo=180s elev= 8.6deg humid= 58% sunelev=-17.5deg (moon at 127.0deg phase=0.78 elev=+43.0 )
AL_20121202_052124353_000002_66549401    11 stars filter C [ 3494.4s -  3674.4s] expo=180s elev=10.6deg humid= 59% sunelev=-15.5deg (moon at 127.0deg phase=0.78 elev=+41.0 )
AL_20121202_052435324_000002_66549401    10 stars filter C [ 3685.4s -  3865.4s] expo=180s elev=11.1deg humid= 59% sunelev=-14.9deg (moon at 127.0deg phase=0.78 elev=+41.0 )
AL_20121202_052746276_000002_66549401     7 stars filter R [ 3876.4s -  4056.4s] expo=180s elev=11.6deg humid= 58% sunelev=-14.4deg (moon at 127.0deg phase=0.78 elev=+40.0 )
AL_20121202_053108620_000002_66549501    12 stars filter C [ 4078.7s -  4258.7s] expo=180s elev=12.2deg humid= 57% sunelev=-13.8deg (moon at 127.0deg phase=0.78 elev=+39.0 )
AL_20121202_053419606_000002_66549501     8 stars filter C [ 4269.7s -  4449.7s] expo=180s elev=12.7deg humid= 58% sunelev=-13.2deg (moon at 127.0deg phase=0.78 elev=+39.0 )
AL_20121202_053730857_000002_66549501     7 stars filter R [ 4460.9s -  4640.9s] expo=180s elev=13.2deg humid= 61% sunelev=-12.7deg (moon at 127.0deg phase=0.78 elev=+38.0 )
AL_20121202_054053185_000002_66549601     0 star  filter C [ 4663.2s -  4843.2s] expo=180s elev=13.8deg humid= 61% sunelev=-12.1deg (moon at 127.0deg phase=0.78 elev=+38.0 )
AL_20121202_054403888_000002_66549601     0 star  filter C [ 4854.0s -  5034.0s] expo=180s elev=14.4deg humid= 61% sunelev=-11.6deg (moon at 127.0deg phase=0.78 elev=+37.0 )
AL_20121202_054714904_000002_66549601     5 stars filter R [ 5045.0s -  5225.0s] expo=180s elev=14.9deg humid= 61% sunelev=-11.0deg (moon at 127.0deg phase=0.78 elev=+37.0 )
AL_20121202_055037231_000002_66549701     0 star  filter C [ 5247.3s -  5427.3s] expo=180s elev=15.5deg humid= 60% sunelev=-10.5deg (moon at 127.0deg phase=0.78 elev=+36.0 )
AL_20121202_055348216_000002_66549701     0 star  filter C [ 5438.3s -  5618.3s] expo=180s elev=16.0deg humid= 62% sunelev=-9.9deg (moon at 127.0deg phase=0.78 elev=+35.0 )
AL_20121202_055659173_000002_66549701     0 star  filter R [ 5629.3s -  5809.3s] expo=180s elev=16.6deg humid= 64% sunelev=-9.4deg (moon at 127.0deg phase=0.78 elev=+35.0 )
AL_20121202_060021284_000002_66549801     0 star  filter C [ 5831.4s -  6011.4s] expo=180s elev=17.1deg humid= 64% sunelev=-8.8deg (moon at 127.0deg phase=0.78 elev=+34.0 )
AL_20121202_060332283_000002_66549801     0 star  filter C [ 6022.3s -  6202.3s] expo=180s elev=17.7deg humid= 65% sunelev=-8.3deg (moon at 127.0deg phase=0.78 elev=+34.0 )
AL_20121202_060643426_000002_66549801     0 star  filter R [ 6213.6s -  6393.6s] expo=180s elev=18.2deg humid= 64% sunelev=-7.8deg (moon at 127.0deg phase=0.78 elev=+33.0 )
Informations from GCN notice:
This is a GRB
Date of the alert : 2456263.68061 2012-12-02T04:20:04.704
Decoded useful notice informations.
RA(J2000.0) : 256.7968 17h07m11s2
DEC(J2000.0) : 23.9488 +23d56m55s68
Error radius : 4.0 arcsec
Error box : x=313:315 y=61:63 (pixels)

Other pages about TAROT Calern observatory observations

Sum of images.
Differential photometry.

Galactic coordinates

Galactic coordinates : lon=45.186400 lat=32.835693
NASA/IPAC-Extragalactic-Database tool for calculate an extinction

Extinction from Schlegel et al. (1998, ApJ 500, 525): E(B-V)=0.044
Assuming Rv=3.1: Av=0.147 Ar=0.119 Ai=0.086 Extinction map E(B-V) from Schlegel:

Field of View is about 81 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 121202: TAROT Calern observatory optical observations
Klotz A. (IRAP-CNRS-OMP), Gendre B. (ASDC/INAF-OAR),
Boer M. (UNS-CNRS-OCA), Atteia J.L. (IRAP-CNRS-OMP) report:

We imaged the field of GRB 121202 detected by SWIFT
(trigger 540255) with the TAROT robotic telescope (D=25cm)
located at the Calern observatory, France.

The observations started 34.0s after the GRB trigger
(15.8s after the notice). The elevation of the field increased from
1 degrees above horizon and weather conditions
were XXX.

---- NO
The date of trigger : t0 = 2012-12-02T04:20:04.704

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+34.0s to t0+94.0s : R > 15.1

The second image is 30.0s exposure in tracking mode:
t0+109.8s to t0+139.8s : R > 16.2

We co-added a series of exposures:
t0+109.8s to t0+406.1s : 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 34.0s 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= 45.1864 lat=+32.8357
and the galactic extinction in R band is 0.1 magnitudes
estimated from D. Schlegel et al. 1998ApJ...500..525S.

This message may be cited.