GRB120819_131015_SWIFT at TAROT Calern observatory

TAROT Calern observatory log of images

AL_20120819_192821072_000002_59973401     5 stars filter R [22501.5s - 22681.5s] expo=180s elev=31.7deg humid= 65% sunelev=-10.2deg (moon at  63.0deg phase=0.15 elev= -5.0 )
AL_20120819_193131822_000002_59973401     3 stars filter V [22692.2s - 22872.2s] expo=180s elev=31.3deg humid= 65% sunelev=-10.7deg (moon at  63.0deg phase=0.15 elev= -5.0 )
AL_20120819_194833539_000002_59973501     7 stars filter C [23714.0s - 23894.0s] expo=180s elev=29.4deg humid= 62% sunelev=-13.3deg (moon at  63.0deg phase=0.15 elev= -8.0 )
AL_20120819_195144728_000002_59973501     6 stars filter R [23905.2s - 24085.2s] expo=180s elev=29.0deg humid= 61% sunelev=-13.8deg (moon at  63.0deg phase=0.15 elev= -9.0 )
AL_20120819_195455478_000002_59973501     5 stars filter V [24095.9s - 24275.9s] expo=180s elev=28.6deg humid= 61% sunelev=-14.3deg (moon at  63.0deg phase=0.15 elev=-10.0 )
AL_20120819_201257869_000002_59973601     7 stars filter C [25178.2s - 25358.2s] expo=180s elev=26.2deg humid= 64% sunelev=-16.9deg (moon at  62.0deg phase=0.16 elev=-13.0 )
AL_20120819_201608102_000002_59973601     5 stars filter R [25368.5s - 25548.5s] expo=180s elev=25.8deg humid= 65% sunelev=-17.4deg (moon at  62.0deg phase=0.16 elev=-13.0 )
AL_20120819_201918665_000002_59973601     5 stars filter V [25559.0s - 25739.0s] expo=180s elev=25.4deg humid= 66% sunelev=-17.9deg (moon at  62.0deg phase=0.16 elev=-14.0 )
AL_20120819_203735940_000002_59973701     7 stars filter C [26656.4s - 26836.4s] expo=180s elev=22.8deg humid= 67% sunelev=-20.4deg (moon at  62.0deg phase=0.16 elev=-17.0 )
AL_20120819_204046222_000002_59973701     6 stars filter R [26846.6s - 27026.6s] expo=180s elev=22.3deg humid= 67% sunelev=-20.8deg (moon at  62.0deg phase=0.16 elev=-17.0 )
AL_20120819_204356776_000002_59973701     5 stars filter V [27037.1s - 27217.1s] expo=180s elev=21.9deg humid= 68% sunelev=-21.2deg (moon at  62.0deg phase=0.16 elev=-18.0 )
Informations from GCN notice:
This is a GRB
Date of the alert : 2456159.04878 2012-08-19T13:10:14.591
Decoded useful notice informations.
RA(J2000.0) : 235.9084 15h43m38s0
DEC(J2000.0) : -7.309 -07d18m32s40
Error radius : 3.6 arcsec
Error box : x=41:43 y=59:61 (pixels)

Other pages about TAROT Calern observatory observations

Sum of images.
Differential photometry.

Galactic coordinates

Galactic coordinates : lon=359.679564 lat=35.968205
NASA/IPAC-Extragalactic-Database tool for calculate an extinction

Extinction from Schlegel et al. (1998, ApJ 500, 525): E(B-V)=0.178
Assuming Rv=3.1: Av=0.590 Ar=0.476 Ai=0.345 Extinction map E(B-V) from Schlegel:

Field of View is about 86 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 120819: 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 120819 detected by SWIFT
(trigger 531428) with the TAROT robotic telescope (D=25cm)
located at the Calern observatory, France.

The observations started 6.25h after the GRB trigger.
The elevation of the field decreased from
31 degrees above horizon and weather conditions
were XXX.

---- NO
The date of trigger : t0 = 2012-08-19T13:10:14.591

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+22501.5s to t0+22681.5s : R > 15.1

The second image is 180.0s exposure in tracking mode:
t0+22692.2s to t0+22872.2s : R > 16.2

We co-added a series of exposures:
t0+22692.2s to t0+25548.5s : 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 6.25h 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=359.6796 lat=+35.9682
and the galactic extinction in R band is 0.5 magnitudes
estimated from D. Schlegel et al. 1998ApJ...500..525S.

This message may be cited.