GRB111225_035121_SWIFT at TAROT Calern observatory

TAROT Calern observatory log of images

AL_20111225_040312941_000002_38620101    30 stars filter C [  660.1s -   750.1s] expo= 90s elev= 9.5deg humid= 49% sunelev=-31.6deg (moon at 108.0deg phase=0.03 elev=-34.0 )
AL_20111225_040453674_000002_38620101    29 stars filter C [  760.9s -   850.9s] expo= 90s elev= 9.4deg humid= 49% sunelev=-31.3deg (moon at 108.0deg phase=0.03 elev=-34.0 )
AL_20111225_040634191_000002_38620101    20 stars filter R [  861.4s -   951.4s] expo= 90s elev= 9.3deg humid= 49% sunelev=-31.0deg (moon at 108.0deg phase=0.03 elev=-34.0 )
AL_20111225_040814674_000002_38620101    27 stars filter C [  961.9s -  1051.9s] expo= 90s elev= 9.2deg humid= 49% sunelev=-30.7deg (moon at 108.0deg phase=0.04 elev=-34.0 )
AL_20111225_040955195_000002_38620101    29 stars filter C [ 1062.4s -  1152.4s] expo= 90s elev= 9.1deg humid= 49% sunelev=-30.4deg (moon at 108.0deg phase=0.04 elev=-33.0 )
AL_20111225_041135460_000002_38620101    24 stars filter R [ 1162.7s -  1252.7s] expo= 90s elev= 9.0deg humid= 49% sunelev=-30.1deg (moon at 108.0deg phase=0.04 elev=-33.0 )
AL_20111225_041418163_000002_38620201    25 stars filter C [ 1325.4s -  1415.4s] expo= 90s elev= 8.9deg humid= 49% sunelev=-29.6deg (moon at 108.0deg phase=0.04 elev=-33.0 )
AL_20111225_041558680_000002_38620201    28 stars filter C [ 1425.9s -  1515.9s] expo= 90s elev= 8.8deg humid= 49% sunelev=-29.3deg (moon at 108.0deg phase=0.04 elev=-32.0 )
AL_20111225_041739413_000002_38620201    22 stars filter R [ 1526.6s -  1616.6s] expo= 90s elev= 8.7deg humid= 49% sunelev=-29.0deg (moon at 108.0deg phase=0.04 elev=-32.0 )
AL_20111225_041919913_000002_38620201    28 stars filter C [ 1627.1s -  1717.1s] expo= 90s elev= 8.6deg humid= 49% sunelev=-28.7deg (moon at 108.0deg phase=0.04 elev=-32.0 )
AL_20111225_042100170_000002_38620201    26 stars filter C [ 1727.4s -  1817.4s] expo= 90s elev= 8.5deg humid= 49% sunelev=-28.4deg (moon at 108.0deg phase=0.04 elev=-31.0 )
AL_20111225_042240622_000002_38620201    20 stars filter R [ 1827.9s -  1917.9s] expo= 90s elev= 8.4deg humid= 49% sunelev=-28.1deg (moon at 108.0deg phase=0.04 elev=-31.0 )
AL_20111225_043037580_000002_38620301    26 stars filter C [ 2214.7s -  2394.7s] expo=180s elev= 8.1deg humid= 50% sunelev=-27.0deg (moon at 108.0deg phase=0.04 elev=-30.0 )
AL_20111225_043348485_000002_38620301    28 stars filter C [ 2405.7s -  2585.7s] expo=180s elev= 7.9deg humid= 51% sunelev=-26.4deg (moon at 108.0deg phase=0.04 elev=-29.0 )
AL_20111225_043659235_000002_38620301    20 stars filter R [ 2596.5s -  2776.5s] expo=180s elev= 7.8deg humid= 54% sunelev=-25.8deg (moon at 108.0deg phase=0.04 elev=-29.0 )
AL_20111225_044010210_000002_38620301    24 stars filter C [ 2787.4s -  2967.4s] expo=180s elev= 7.6deg humid= 55% sunelev=-25.3deg (moon at 108.0deg phase=0.04 elev=-28.0 )
AL_20111225_044320538_000002_38620301    24 stars filter C [ 2977.7s -  3157.7s] expo=180s elev= 7.5deg humid= 56% sunelev=-24.7deg (moon at 108.0deg phase=0.04 elev=-28.0 )
AL_20111225_044631224_000002_38620301    19 stars filter R [ 3168.4s -  3348.4s] expo=180s elev= 7.4deg humid= 56% sunelev=-24.1deg (moon at 108.0deg phase=0.04 elev=-27.0 )
AL_20111225_045043932_000002_38620401    22 stars filter C [ 3421.1s -  3601.1s] expo=180s elev= 7.2deg humid= 56% sunelev=-23.4deg (moon at 108.0deg phase=0.04 elev=-26.0 )
AL_20111225_045354198_000002_38620401     0 star  filter C [ 3611.4s -  3791.4s] expo=180s elev= 7.1deg humid= 56% sunelev=-22.8deg (moon at 108.0deg phase=0.04 elev=-26.0 )
AL_20111225_045703995_000002_38620401     0 star  filter R [ 3801.2s -  3981.2s] expo=180s elev= 7.0deg humid= 56% sunelev=-22.3deg (moon at 108.0deg phase=0.04 elev=-25.0 )
AL_20111225_050013859_000002_38620401     0 star  filter C [ 3991.0s -  4171.0s] expo=180s elev= 6.8deg humid= 57% sunelev=-21.7deg (moon at 108.0deg phase=0.04 elev=-25.0 )
AL_20111225_050323609_000002_38620401     0 star  filter C [ 4180.8s -  4360.8s] expo=180s elev= 6.7deg humid= 57% sunelev=-21.2deg (moon at 108.0deg phase=0.04 elev=-24.0 )
AL_20111225_050633718_000002_38620401     0 star  filter R [ 4370.9s -  4550.9s] expo=180s elev= 6.6deg humid= 57% sunelev=-20.6deg (moon at 108.0deg phase=0.04 elev=-24.0 )
AL_20111225_051049348_000002_38620501    15 stars filter C [ 4626.6s -  4806.6s] expo=180s elev= 6.5deg humid= 57% sunelev=-19.9deg (moon at 108.0deg phase=0.04 elev=-23.0 )
AL_20111225_051359614_000002_38620501    15 stars filter C [ 4816.8s -  4996.8s] expo=180s elev= 6.4deg humid= 57% sunelev=-19.3deg (moon at 108.0deg phase=0.04 elev=-22.0 )
AL_20111225_051710052_000002_38620501    12 stars filter R [ 5007.4s -  5187.4s] expo=180s elev= 6.3deg humid= 58% sunelev=-18.7deg (moon at 108.0deg phase=0.04 elev=-22.0 )
AL_20111225_052020931_000002_38620501    12 stars filter C [ 5198.1s -  5378.1s] expo=180s elev= 6.2deg humid= 58% sunelev=-18.2deg (moon at 108.0deg phase=0.04 elev=-21.0 )
AL_20111225_052331837_000002_38620501    12 stars filter C [ 5389.0s -  5569.0s] expo=180s elev= 6.2deg humid= 58% sunelev=-17.6deg (moon at 108.0deg phase=0.04 elev=-21.0 )
AL_20111225_052641682_000002_38620501     8 stars filter R [ 5578.9s -  5758.9s] expo=180s elev= 6.1deg humid= 59% sunelev=-17.1deg (moon at 108.0deg phase=0.04 elev=-20.0 )
AL_20111225_053056480_000002_38620601    11 stars filter C [ 5833.6s -  6013.6s] expo=180s elev= 6.0deg humid= 59% sunelev=-16.4deg (moon at 108.0deg phase=0.04 elev=-20.0 )
AL_20111225_053407402_000002_38620601     0 star  filter C [ 6024.6s -  6204.6s] expo=180s elev= 5.9deg humid= 59% sunelev=-15.8deg (moon at 108.0deg phase=0.04 elev=-19.0 )
AL_20111225_053717246_000002_38620601     0 star  filter R [ 6214.4s -  6394.4s] expo=180s elev= 5.9deg humid= 59% sunelev=-15.3deg (moon at 108.0deg phase=0.04 elev=-18.0 )
AL_20111225_054027016_000002_38620601     0 star  filter C [ 6404.2s -  6584.2s] expo=180s elev= 5.8deg humid= 59% sunelev=-14.7deg (moon at 108.0deg phase=0.04 elev=-18.0 )
AL_20111225_054648017_000002_38620601     0 star  filter R [ 6785.3s -  6965.3s] expo=180s elev= 5.7deg humid= 59% sunelev=-13.6deg (moon at 108.0deg phase=0.04 elev=-17.0 )
AL_20111225_055058677_000002_38620701     0 star  filter C [ 7035.8s -  7215.8s] expo=180s elev= 5.7deg humid= 58% sunelev=-12.9deg (moon at 108.0deg phase=0.04 elev=-16.0 )
AL_20111225_055409131_000002_38620701     0 star  filter C [ 7226.4s -  7406.4s] expo=180s elev= 5.6deg humid= 57% sunelev=-12.4deg (moon at 108.0deg phase=0.04 elev=-16.0 )
AL_20111225_055720098_000002_38620701     0 star  filter R [ 7417.3s -  7597.3s] expo=180s elev= 5.6deg humid= 56% sunelev=-11.9deg (moon at 108.0deg phase=0.04 elev=-15.0 )
AL_20111225_060341119_000002_38620701     0 star  filter C [ 7798.3s -  7978.3s] expo=180s elev= 5.6deg humid= 55% sunelev=-10.8deg (moon at 108.0deg phase=0.04 elev=-14.0 )
AL_20111225_061051547_000002_38620801     0 star  filter C [ 8228.8s -  8408.8s] expo=180s elev= 5.6deg humid= 55% sunelev=-9.6deg (moon at 107.0deg phase=0.04 elev=-13.0 )
AL_20111225_062022132_000002_38620801     0 star  filter C [ 8799.4s -  8979.4s] expo=180s elev= 5.6deg humid= 54% sunelev=-8.0deg (moon at 107.0deg phase=0.04 elev=-11.0 )
Informations from GCN notice:
This is a GRB
Date of GRB : 2455920.6601596065 2011-12-25T03:50:37.790
Date of notice : 2455920.6606712961 2011-12-25T03:51:21.999
Refined position : yes (error radius=2.3 arcsec)
RA(J2000.0) : 13.154500 00h52m37s0
DEC(J2000.0) : 51.571600 +51d34m17s75
Error box : x=27:29 y=44:46 (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=123.085377 lat=-11.282761
NASA/IPAC-Extragalactic-Database tool for calculate an extinction

Extinction from Schlegel et al. (1998, ApJ 500, 525): E(B-V)=0.168
Assuming Rv=3.1: Av=0.557 Ar=0.449 Ai=0.326 Extinction map E(B-V) from Schlegel:

Field of View is about 61 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 111225: TAROT Calern observatory optical observations
Klotz A. (IRAP-OMP), Gendre B. (ASDC/INAF-OAR),
Boer M. (OCA-CNRS), Atteia J.L. (IRAP-OMP) report:

We imaged the field of GRB 111225 detected by SWIFT
(trigger 510341) with the TAROT robotic telescope (D=25cm)
located at the Calern observatory, France.

The observations started 660.1s after the GRB trigger
(616.0s after the notice). The elevation of the field decreased from
9 degrees above horizon and weather conditions
were XXX.

---- NO
The date of trigger : t0 = 2011-12-25T03:50:37.823

The first image is trailed with a duration of 90.0s
(see the description in Klotz et al., 2006, A&A 451, L39).
We do not detect any OT with a limiting magnitude of:
t0+660.1s to t0+750.1s : R > 15.1

The second image is 90.0s exposure in tracking mode:
t0+760.9s to t0+850.9s : R > 16.2

We co-added a series of exposures:
t0+760.9s to t0+1415.4s : 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 660.1s 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=123.0854 lat=-11.2828
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.