GRB120806_173332_SWIFT at TAROT Calern observatory

TAROT Calern observatory log of images

AL_20120806_211524497_000002_59115701     7 stars filter C [13127.5s - 13307.5s] expo=180s elev= 4.3deg humid= 60% sunelev=-21.3deg (moon at  51.0deg phase=0.68 elev= +5.0 )
AL_20120806_211835497_000002_59115701     5 stars filter C [13318.5s - 13498.5s] expo=180s elev= 4.6deg humid= 59% sunelev=-21.6deg (moon at  51.0deg phase=0.68 elev= +6.0 )
AL_20120806_212146903_000002_59115701     7 stars filter R [13510.0s - 13690.0s] expo=180s elev= 4.9deg humid= 59% sunelev=-22.0deg (moon at  51.0deg phase=0.68 elev= +6.0 )
AL_20120806_220818215_000002_59116101    16 stars filter C [16301.2s - 16481.2s] expo=180s elev=10.0deg humid= 61% sunelev=-26.2deg (moon at  51.0deg phase=0.67 elev=+15.0 )
AL_20120806_221129170_000002_59116101    15 stars filter R [16492.2s - 16672.2s] expo=180s elev=10.4deg humid= 61% sunelev=-26.5deg (moon at  51.0deg phase=0.67 elev=+15.0 )
AL_20120806_221439967_000002_59116101     8 stars filter V [16682.9s - 16862.9s] expo=180s elev=10.7deg humid= 62% sunelev=-26.7deg (moon at  51.0deg phase=0.67 elev=+16.0 )
AL_20120806_223249424_000002_59116201    19 stars filter C [17772.5s - 17952.5s] expo=180s elev=13.0deg humid= 67% sunelev=-27.9deg (moon at  50.0deg phase=0.67 elev=+19.0 )
AL_20120806_223559681_000002_59116201    14 stars filter R [17962.7s - 18142.7s] expo=180s elev=13.4deg humid= 67% sunelev=-28.0deg (moon at  50.0deg phase=0.67 elev=+20.0 )
AL_20120806_223910211_000002_59116201     9 stars filter V [18153.2s - 18333.2s] expo=180s elev=13.8deg humid= 68% sunelev=-28.2deg (moon at  50.0deg phase=0.67 elev=+20.0 )
AL_20120806_225720065_000002_59116301    24 stars filter C [19243.1s - 19423.1s] expo=180s elev=16.2deg humid= 62% sunelev=-29.0deg (moon at  50.0deg phase=0.67 elev=+23.0 )
AL_20120806_230030611_000002_59116301    17 stars filter R [19433.6s - 19613.6s] expo=180s elev=16.6deg humid= 61% sunelev=-29.1deg (moon at  50.0deg phase=0.67 elev=+24.0 )
AL_20120806_230342019_000002_59116301    13 stars filter V [19625.1s - 19805.1s] expo=180s elev=17.0deg humid= 63% sunelev=-29.2deg (moon at  50.0deg phase=0.67 elev=+24.0 )
Informations from GCN notice:
This is a GRB
Date of the alert : 2456146.23162 2012-08-06T17:33:31.968
Decoded useful notice informations.
RA(J2000.0) : 55.308 03h41m13s9
DEC(J2000.0) : 40.9686 +40d58m06s95
Error radius : 1.1 arcsec
Error box : x=71:72 y=104:105 (pixels)

Other pages about TAROT Calern observatory observations

Sum of images.
Differential photometry.

Galactic coordinates

Galactic coordinates : lon=154.280192 lat=-11.381077
NASA/IPAC-Extragalactic-Database tool for calculate an extinction

Extinction from Schlegel et al. (1998, ApJ 500, 525): E(B-V)=0.233
Assuming Rv=3.1: Av=0.772 Ar=0.623 Ai=0.452 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 120806: 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 120806 detected by SWIFT
(trigger 530214) with the TAROT robotic telescope (D=25cm)
located at the Calern observatory, France.

The observations started 3.65h after the GRB trigger.
The elevation of the field increased from
4 degrees above horizon and weather conditions
were XXX.

---- NO
The date of trigger : t0 = 2012-08-06T17:33:31.968

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+13127.5s to t0+13307.5s : R > 15.1

The second image is 180.0s exposure in tracking mode:
t0+13318.5s to t0+13498.5s : R > 16.2

We co-added a series of exposures:
t0+13318.5s to t0+17952.5s : 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 3.65h 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=154.2802 lat=-11.3811
and the galactic extinction in R band is 0.6 magnitudes
estimated from D. Schlegel et al. 1998ApJ...500..525S.

This message may be cited.