GRB111225_035122_SWIFT at TAROT Calern observatory

TAROT Calern observatory log of images

AL_20111225_035242499_111225_03510     0 star  filter C [   59.7s -   119.7s] expo= 60s elev=10.2deg humid= 49% sunelev=-33.4deg (moon at 108.0deg phase=0.03 elev=-36.0 )
AL_20111225_035327185_111225_03510    23 stars filter C [  134.4s -   164.4s] expo= 30s elev=10.1deg humid= 50% sunelev=-33.2deg (moon at 108.0deg phase=0.03 elev=-36.0 )
AL_20111225_035407671_111225_03510    24 stars filter C [  174.9s -   204.9s] expo= 30s elev=10.1deg humid= 50% sunelev=-33.1deg (moon at 108.0deg phase=0.03 elev=-36.0 )
AL_20111225_035447951_111225_03510    24 stars filter C [  215.2s -   245.2s] expo= 30s elev=10.0deg humid= 50% sunelev=-33.0deg (moon at 108.0deg phase=0.03 elev=-36.0 )
AL_20111225_035528952_111225_03510    24 stars filter C [  256.2s -   286.2s] expo= 30s elev=10.0deg humid= 50% sunelev=-32.9deg (moon at 108.0deg phase=0.03 elev=-36.0 )
AL_20111225_035609452_111225_03510    22 stars filter C [  296.7s -   326.7s] expo= 30s elev= 9.9deg humid= 50% sunelev=-32.7deg (moon at 108.0deg phase=0.03 elev=-36.0 )
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=282.0 arcsec)
RA(J2000.0) : 13.102000 00h52m24s4
DEC(J2000.0) : 51.589000 +51d35m20s39
Error box : x=-20:149 y=-20:149 (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 59.7s after the GRB trigger
(15.5s after the notice). The elevation of the field decreased from
10 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 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+59.7s to t0+119.7s : R > 15.1

The second image is 30.0s exposure in tracking mode:
t0+134.4s to t0+164.4s : R > 16.2

We co-added a series of exposures:
t0+134.4s to t0+326.7s : 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 59.7s 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.

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