GRB110812_071403_SWIFT at TAROT Calern observatory

TAROT Calern observatory log of images

AL_20110812_194341824_000002_11026401    47 stars filter C [45229.8s - 45319.8s] expo= 90s elev=21.3deg humid= 70% sunelev=-10.8deg (moon at  32.0deg phase=0.94 elev=+17.0 )
AL_20110812_194521637_000002_11026401    49 stars filter C [45329.6s - 45419.6s] expo= 90s elev=21.4deg humid= 69% sunelev=-11.1deg (moon at  32.0deg phase=0.94 elev=+17.0 )
AL_20110812_194701699_000002_11026401    46 stars filter R [45429.6s - 45519.6s] expo= 90s elev=21.4deg humid= 69% sunelev=-11.3deg (moon at  32.0deg phase=0.94 elev=+17.0 )
AL_20110812_194842433_000002_11026401    55 stars filter C [45530.4s - 45620.4s] expo= 90s elev=21.5deg humid= 69% sunelev=-11.6deg (moon at  32.0deg phase=0.94 elev=+17.0 )
AL_20110812_195023387_000002_11026401    62 stars filter C [45631.3s - 45721.3s] expo= 90s elev=21.6deg humid= 69% sunelev=-11.8deg (moon at  32.0deg phase=0.94 elev=+18.0 )
AL_20110812_195204128_000002_11026401    44 stars filter R [45732.1s - 45822.1s] expo= 90s elev=21.6deg humid= 69% sunelev=-12.1deg (moon at  32.0deg phase=0.94 elev=+18.0 )
AL_20110812_221121468_000002_11027201     0 star  filter C [53999.4s - 54179.4s] expo=180s elev=19.3deg humid= 57% sunelev=-28.0deg (moon at  32.0deg phase=0.94 elev=+30.0 )
AL_20110812_221432218_000002_11027201     0 star  filter C [54190.2s - 54370.2s] expo=180s elev=19.1deg humid= 58% sunelev=-28.3deg (moon at  32.0deg phase=0.94 elev=+30.0 )
AL_20110812_221742671_000002_11027201    29 stars filter R [54380.6s - 54560.6s] expo=180s elev=18.9deg humid= 58% sunelev=-28.5deg (moon at  32.0deg phase=0.94 elev=+30.0 )
AL_20110812_222053453_000002_11027201     0 star  filter C [54571.4s - 54751.4s] expo=180s elev=18.7deg humid= 58% sunelev=-28.7deg (moon at  33.0deg phase=0.94 elev=+30.0 )
AL_20110812_222404177_000002_11027201     0 star  filter C [54762.1s - 54942.1s] expo=180s elev=18.4deg humid= 58% sunelev=-28.9deg (moon at  33.0deg phase=0.94 elev=+30.0 )
AL_20110812_222714475_000002_11027201     7 stars filter R [54952.4s - 55132.4s] expo=180s elev=18.2deg humid= 58% sunelev=-29.1deg (moon at  33.0deg phase=0.94 elev=+30.0 )
AL_20110812_223131776_000002_11027301     0 star  filter C [55209.7s - 55389.7s] expo=180s elev=17.8deg humid= 57% sunelev=-29.4deg (moon at  33.0deg phase=0.94 elev=+31.0 )
AL_20110812_223442275_000002_11027301     0 star  filter C [55400.2s - 55580.2s] expo=180s elev=17.6deg humid= 58% sunelev=-29.5deg (moon at  33.0deg phase=0.94 elev=+31.0 )
AL_20110812_223752775_000002_11027301    26 stars filter R [55590.7s - 55770.7s] expo=180s elev=17.3deg humid= 58% sunelev=-29.7deg (moon at  33.0deg phase=0.94 elev=+31.0 )
AL_20110812_224103687_000002_11027301     0 star  filter C [55781.7s - 55961.7s] expo=180s elev=17.0deg humid= 58% sunelev=-29.9deg (moon at  33.0deg phase=0.94 elev=+31.0 )
AL_20110812_224724781_000002_11027301    41 stars filter R [56162.7s - 56342.7s] expo=180s elev=16.5deg humid= 58% sunelev=-30.2deg (moon at  33.0deg phase=0.94 elev=+31.0 )
AL_20110812_231132015_000002_11027501     0 star  filter C [57610.0s - 57790.0s] expo=180s elev=14.1deg humid= 55% sunelev=-31.0deg (moon at  33.0deg phase=0.94 elev=+31.0 )
AL_20110812_231442765_000002_11027501     0 star  filter C [57800.7s - 57980.7s] expo=180s elev=13.8deg humid= 54% sunelev=-31.1deg (moon at  33.0deg phase=0.94 elev=+31.0 )
AL_20110812_231753031_000002_11027501    36 stars filter R [57991.0s - 58171.0s] expo=180s elev=13.4deg humid= 53% sunelev=-31.2deg (moon at  33.0deg phase=0.94 elev=+31.0 )
AL_20110812_232103521_000002_11027501     0 star  filter C [58181.5s - 58361.5s] expo=180s elev=13.1deg humid= 54% sunelev=-31.2deg (moon at  33.0deg phase=0.94 elev=+31.0 )
AL_20110812_232414022_000002_11027501     0 star  filter C [58372.0s - 58552.0s] expo=180s elev=12.7deg humid= 54% sunelev=-31.3deg (moon at  33.0deg phase=0.94 elev=+31.0 )
AL_20110812_232724288_000002_11027501    34 stars filter R [58562.2s - 58742.2s] expo=180s elev=12.4deg humid= 53% sunelev=-31.3deg (moon at  33.0deg phase=0.94 elev=+30.0 )
AL_20110812_235452489_000002_11027701     0 star  filter C [60210.4s - 60390.4s] expo=180s elev= 9.1deg humid= 53% sunelev=-31.2deg (moon at  33.0deg phase=0.94 elev=+29.0 )
AL_20110812_235802990_000002_11027701    21 stars filter R [60400.9s - 60580.9s] expo=180s elev= 8.7deg humid= 52% sunelev=-31.2deg (moon at  33.0deg phase=0.94 elev=+29.0 )
AL_20110813_000113463_000002_11027701     0 star  filter C [60591.4s - 60771.4s] expo=180s elev= 8.3deg humid= 52% sunelev=-31.1deg (moon at  33.0deg phase=0.94 elev=+29.0 )
AL_20110813_000423979_000002_11027701     0 star  filter C [60782.0s - 60962.0s] expo=180s elev= 7.9deg humid= 52% sunelev=-31.1deg (moon at  33.0deg phase=0.94 elev=+29.0 )
AL_20110813_000734494_000002_11027701    20 stars filter R [60972.4s - 61152.4s] expo=180s elev= 7.5deg humid= 51% sunelev=-31.0deg (moon at  33.0deg phase=0.94 elev=+29.0 )
Informations from GCN notice:
This is not a GRB (a retractation has been edited)
Date of GRB : 2455785.7974159722 2011-08-12T07:08:16.739
Date of notice : 2455785.8014236111 2011-08-12T07:14:03.000
Refined position : no
RA(J2000.0) : 277.363000 18h29m27s1
DEC(J2000.0) : -23.790000 -23d47m24s00
Error box : x=10:119 y=10:118 (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=9.276848 lat=-6.080911
NASA/IPAC-Extragalactic-Database tool for calculate an extinction

Extinction from Schlegel et al. (1998, ApJ 500, 525): E(B-V)=0.923
Assuming Rv=3.1: Av=3.061 Ar=2.468 Ai=1.791 Extinction map E(B-V) from Schlegel:

Field of View is about 58 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 110812: TAROT Calern observatory optical observations
Klotz A. (CESR-OMP), Gendre B. (ASDC),
Boer M. (OHP-OAMP), Atteia J.L. (LATT-OMP) report:

We imaged the field of GRB 110812 detected by SWIFT
(trigger 500108) with the TAROT robotic telescope (D=25cm)
located at the Calern observatory, France.

The observations started 45229.8s after the GRB trigger
(44883.9s after the notice). The elevation of the field increased from
21 degrees above horizon and weather conditions
were XXX.

---- NO
The date of trigger : t0 = 2011-08-12T07:08:17.088

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+45229.8s to t0+45319.8s : R > 15.1

The second image is 90.0s exposure in tracking mode:
t0+45329.6s to t0+45419.6s : R > 16.2

We co-added a series of exposures:
t0+45329.6s to t0+54179.4s : 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 45229.8s 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=  9.2768 lat= -6.0809
and the galactic extinction in R band is 2.5 magnitudes
estimated from D. Schlegel et al. 1998ApJ...500..525S.

This message may be cited.