GRB120713_141655_SWIFT at TAROT Calern observatory

TAROT Calern observatory log of images

AL_20120713_202404646_000002_57355001     0 star  filter C [21844.7s - 22024.7s] expo=180s elev=18.4deg humid= 54% sunelev=-10.6deg (moon at 144.0deg phase=0.33 elev=-26.0 )
AL_20120713_202715693_000002_57355001    39 stars filter R [22035.7s - 22215.7s] expo=180s elev=18.6deg humid= 53% sunelev=-11.0deg (moon at 144.0deg phase=0.33 elev=-26.0 )
AL_20120713_203025981_000002_57355001    39 stars filter V [22225.9s - 22405.9s] expo=180s elev=18.8deg humid= 53% sunelev=-11.4deg (moon at 144.0deg phase=0.33 elev=-25.0 )
AL_20120713_204835220_000002_57355101    55 stars filter C [23314.6s - 23494.6s] expo=180s elev=19.8deg humid= 54% sunelev=-13.6deg (moon at 144.0deg phase=0.33 elev=-24.0 )
AL_20120713_205146570_000002_57355101    45 stars filter R [23506.5s - 23686.5s] expo=180s elev=20.0deg humid= 54% sunelev=-14.0deg (moon at 144.0deg phase=0.33 elev=-24.0 )
AL_20120713_205457335_000002_57355101    47 stars filter V [23697.3s - 23877.3s] expo=180s elev=20.1deg humid= 54% sunelev=-14.4deg (moon at 144.0deg phase=0.33 elev=-24.0 )
AL_20120713_211258692_000002_57355201    55 stars filter C [24778.7s - 24958.7s] expo=180s elev=20.8deg humid= 56% sunelev=-16.3deg (moon at 145.0deg phase=0.33 elev=-22.0 )
AL_20120713_211609941_000002_57355201    47 stars filter R [24969.9s - 25149.9s] expo=180s elev=20.9deg humid= 56% sunelev=-16.7deg (moon at 145.0deg phase=0.33 elev=-22.0 )
AL_20120713_211921356_000002_57355201    49 stars filter V [25161.3s - 25341.3s] expo=180s elev=21.0deg humid= 58% sunelev=-17.0deg (moon at 145.0deg phase=0.33 elev=-22.0 )
AL_20120713_213730530_000002_57355301    64 stars filter C [26250.5s - 26430.5s] expo=180s elev=21.4deg humid= 56% sunelev=-18.7deg (moon at 145.0deg phase=0.33 elev=-20.0 )
AL_20120713_214041301_000002_57355301    54 stars filter R [26441.2s - 26621.2s] expo=180s elev=21.4deg humid= 56% sunelev=-19.0deg (moon at 145.0deg phase=0.33 elev=-20.0 )
AL_20120713_214352051_000002_57355301    55 stars filter V [26632.0s - 26812.0s] expo=180s elev=21.4deg humid= 56% sunelev=-19.3deg (moon at 145.0deg phase=0.33 elev=-20.0 )
AL_20120713_220208876_000002_57355401    49 stars filter C [27728.9s - 27908.9s] expo=180s elev=21.4deg humid= 60% sunelev=-20.8deg (moon at 145.0deg phase=0.33 elev=-18.0 )
AL_20120713_220519908_000002_57355401    54 stars filter R [27919.8s - 28099.8s] expo=180s elev=21.4deg humid= 60% sunelev=-21.0deg (moon at 145.0deg phase=0.33 elev=-17.0 )
AL_20120713_220831314_000002_57355401    50 stars filter V [28111.3s - 28291.3s] expo=180s elev=21.4deg humid= 60% sunelev=-21.2deg (moon at 145.0deg phase=0.33 elev=-17.0 )
Informations from GCN notice:
This is a GRB
Date of the alert : 2456122.09508 2012-07-13T14:16:54.911
Decoded useful notice informations.
RA(J2000.0) : 267.0242 17h48m05s8
DEC(J2000.0) : -24.7779 -24d46m40s43
Error radius : 6.1 arcsec
Error box : x=50:54 y=102:106 (pixels)

Other pages about TAROT Calern observatory observations

Sum of images.
Differential photometry.

Galactic coordinates

Galactic coordinates : lon=3.804749 lat=1.676713
NASA/IPAC-Extragalactic-Database tool for calculate an extinction

Extinction from Schlegel et al. (1998, ApJ 500, 525): E(B-V)=4.060
Assuming Rv=3.1: Av=13.458 Ar=10.852 Ai=7.876 Extinction map E(B-V) from Schlegel:

Field of View is about 56 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 120713: 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 120713 detected by SWIFT
(trigger 526511) with the TAROT robotic telescope (D=25cm)
located at the Calern observatory, France.

The observations started 6.07h after the GRB trigger.
The elevation of the field increased from
18 degrees above horizon and weather conditions
were XXX.

---- NO
The date of trigger : t0 = 2012-07-13T14:16:54.911

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+21844.7s to t0+22024.7s : R > 15.1

The second image is 180.0s exposure in tracking mode:
t0+22035.7s to t0+22215.7s : R > 16.2

We co-added a series of exposures:
t0+22035.7s to t0+24958.7s : 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 6.07h 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=  3.8047 lat= +1.6767
and the galactic extinction in R band is 10.9 magnitudes
estimated from D. Schlegel et al. 1998ApJ...500..525S.

This message may be cited.