GRB110807_195802_SWIFT at TAROT Calern observatory

TAROT Calern observatory log of images

AL_20110807_221731116_000002_09992601    45 stars filter C [ 8199.5s -  8379.5s] expo=180s elev=35.0deg humid= 88% sunelev=-27.0deg (moon at  39.0deg phase=0.60 elev= +5.0 )
AL_20110807_222041116_000002_09992601    59 stars filter C [ 8389.5s -  8569.5s] expo=180s elev=34.8deg humid= 88% sunelev=-27.2deg (moon at  38.0deg phase=0.60 elev= +4.0 )
AL_20110807_222351649_000002_09992601    50 stars filter R [ 8580.0s -  8760.0s] expo=180s elev=34.6deg humid= 87% sunelev=-27.5deg (moon at  38.0deg phase=0.60 elev= +4.0 )
AL_20110807_222702387_000002_09992601    47 stars filter C [ 8770.8s -  8950.8s] expo=180s elev=34.3deg humid= 87% sunelev=-27.6deg (moon at  38.0deg phase=0.60 elev= +4.0 )
AL_20110807_223012654_000002_09992601    67 stars filter C [ 8961.0s -  9141.0s] expo=180s elev=34.1deg humid= 87% sunelev=-27.8deg (moon at  38.0deg phase=0.60 elev= +3.0 )
AL_20110807_223323171_000002_09992601    47 stars filter R [ 9151.6s -  9331.6s] expo=180s elev=33.8deg humid= 86% sunelev=-28.0deg (moon at  38.0deg phase=0.60 elev= +3.0 )
AL_20110807_223731222_000002_09992701    79 stars filter C [ 9399.6s -  9579.6s] expo=180s elev=33.5deg humid= 86% sunelev=-28.2deg (moon at  38.0deg phase=0.60 elev= +2.0 )
AL_20110807_224041707_000002_09992701    71 stars filter C [ 9590.1s -  9770.1s] expo=180s elev=33.2deg humid= 86% sunelev=-28.4deg (moon at  38.0deg phase=0.60 elev= +2.0 )
AL_20110807_224352225_000002_09992701    58 stars filter R [ 9780.6s -  9960.6s] expo=180s elev=32.9deg humid= 85% sunelev=-28.6deg (moon at  38.0deg phase=0.60 elev= +1.0 )
AL_20110807_224702726_000002_09992701    79 stars filter C [ 9971.1s - 10151.1s] expo=180s elev=32.6deg humid= 85% sunelev=-28.7deg (moon at  38.0deg phase=0.60 elev= +1.0 )
AL_20110807_225012992_000002_09992701    63 stars filter C [10161.4s - 10341.4s] expo=180s elev=32.3deg humid= 85% sunelev=-28.8deg (moon at  38.0deg phase=0.60 elev= +0.0 )
AL_20110807_225323744_000002_09992701    72 stars filter R [10352.1s - 10532.1s] expo=180s elev=32.0deg humid= 85% sunelev=-29.0deg (moon at  38.0deg phase=0.60 elev= +0.0 )
AL_20110807_225732967_000002_09992801    75 stars filter C [10601.3s - 10781.3s] expo=180s elev=31.6deg humid= 85% sunelev=-29.1deg (moon at  38.0deg phase=0.60 elev= +0.0 )
AL_20110807_230043669_000002_09992801    90 stars filter C [10792.1s - 10972.1s] expo=180s elev=31.3deg humid= 85% sunelev=-29.2deg (moon at  38.0deg phase=0.60 elev= +0.0 )
AL_20110807_230353952_000002_09992801    76 stars filter R [10982.4s - 11162.4s] expo=180s elev=31.0deg humid= 86% sunelev=-29.3deg (moon at  38.0deg phase=0.60 elev= -1.0 )
AL_20110807_230704251_000002_09992801    73 stars filter C [11172.6s - 11352.6s] expo=180s elev=30.7deg humid= 85% sunelev=-29.4deg (moon at  38.0deg phase=0.60 elev= -1.0 )
AL_20110807_231014971_000002_09992801    90 stars filter C [11363.3s - 11543.3s] expo=180s elev=30.3deg humid= 84% sunelev=-29.5deg (moon at  38.0deg phase=0.60 elev= -2.0 )
AL_20110807_231325488_000002_09992801    59 stars filter R [11553.9s - 11733.9s] expo=180s elev=30.0deg humid= 84% sunelev=-29.6deg (moon at  38.0deg phase=0.60 elev= -2.0 )
AL_20110807_231734445_000002_09992901    87 stars filter C [11802.8s - 11982.8s] expo=180s elev=29.5deg humid= 84% sunelev=-29.7deg (moon at  38.0deg phase=0.60 elev= -3.0 )
AL_20110807_232044960_000002_09992901    70 stars filter C [11993.3s - 12173.3s] expo=180s elev=29.2deg humid= 84% sunelev=-29.7deg (moon at  38.0deg phase=0.61 elev= -3.0 )
AL_20110807_232355416_000002_09992901    63 stars filter R [12183.8s - 12363.8s] expo=180s elev=28.8deg humid= 84% sunelev=-29.8deg (moon at  38.0deg phase=0.61 elev= -4.0 )
AL_20110807_232705965_000002_09992901    82 stars filter C [12374.3s - 12554.3s] expo=180s elev=28.4deg humid= 83% sunelev=-29.8deg (moon at  38.0deg phase=0.61 elev= -4.0 )
AL_20110807_233016232_000002_09992901    53 stars filter C [12564.6s - 12744.6s] expo=180s elev=28.0deg humid= 83% sunelev=-29.9deg (moon at  38.0deg phase=0.61 elev= -5.0 )
AL_20110807_233326765_000002_09992901    64 stars filter R [12755.1s - 12935.1s] expo=180s elev=27.7deg humid= 82% sunelev=-29.9deg (moon at  38.0deg phase=0.61 elev= -5.0 )
AL_20110807_233736910_000002_09993001    47 stars filter C [13005.3s - 13185.3s] expo=180s elev=27.1deg humid= 82% sunelev=-29.9deg (moon at  38.0deg phase=0.61 elev= -6.0 )
AL_20110807_234047174_000002_09993001    43 stars filter C [13195.5s - 13375.5s] expo=180s elev=26.7deg humid= 82% sunelev=-29.9deg (moon at  38.0deg phase=0.61 elev= -6.0 )
AL_20110807_234357881_000002_09993001    33 stars filter R [13386.3s - 13566.3s] expo=180s elev=26.3deg humid= 82% sunelev=-29.9deg (moon at  38.0deg phase=0.61 elev= -7.0 )
AL_20110807_234708414_000002_09993001    49 stars filter C [13576.8s - 13756.8s] expo=180s elev=25.9deg humid= 82% sunelev=-29.9deg (moon at  38.0deg phase=0.61 elev= -7.0 )
AL_20110807_235018898_000002_09993001    61 stars filter C [13767.3s - 13947.3s] expo=180s elev=25.5deg humid= 82% sunelev=-29.9deg (moon at  38.0deg phase=0.61 elev= -8.0 )
AL_20110807_235329400_000002_09993001    36 stars filter R [13957.8s - 14137.8s] expo=180s elev=25.1deg humid= 82% sunelev=-29.8deg (moon at  38.0deg phase=0.61 elev= -8.0 )
AL_20110807_235739561_000002_09993101    49 stars filter C [14207.9s - 14387.9s] expo=180s elev=24.6deg humid= 82% sunelev=-29.8deg (moon at  38.0deg phase=0.61 elev= -9.0 )
AL_20110808_000050296_000002_09993101    54 stars filter C [14398.7s - 14578.7s] expo=180s elev=24.1deg humid= 81% sunelev=-29.7deg (moon at  38.0deg phase=0.61 elev=-10.0 )
AL_20110808_000400578_000002_09993101    50 stars filter R [14588.9s - 14768.9s] expo=180s elev=23.7deg humid= 80% sunelev=-29.6deg (moon at  38.0deg phase=0.61 elev=-10.0 )
AL_20110808_000711285_000002_09993101    86 stars filter C [14779.7s - 14959.7s] expo=180s elev=23.2deg humid= 80% sunelev=-29.6deg (moon at  38.0deg phase=0.61 elev=-11.0 )
AL_20110808_001021596_000002_09993101    71 stars filter C [14969.9s - 15149.9s] expo=180s elev=22.8deg humid= 80% sunelev=-29.5deg (moon at  38.0deg phase=0.61 elev=-11.0 )
AL_20110808_001332083_000002_09993101    71 stars filter R [15160.5s - 15340.5s] expo=180s elev=22.4deg humid= 80% sunelev=-29.4deg (moon at  38.0deg phase=0.61 elev=-12.0 )
AL_20110808_001741273_000002_09993201    66 stars filter C [15409.7s - 15589.7s] expo=180s elev=21.8deg humid= 78% sunelev=-29.3deg (moon at  38.0deg phase=0.61 elev=-12.0 )
AL_20110808_002051789_000002_09993201    82 stars filter C [15600.2s - 15780.2s] expo=180s elev=21.3deg humid= 75% sunelev=-29.2deg (moon at  38.0deg phase=0.61 elev=-13.0 )
AL_20110808_002402323_000002_09993201    69 stars filter R [15790.7s - 15970.7s] expo=180s elev=20.8deg humid= 71% sunelev=-29.0deg (moon at  37.0deg phase=0.61 elev=-13.0 )
AL_20110808_002712825_000002_09993201    72 stars filter C [15981.2s - 16161.2s] expo=180s elev=20.4deg humid= 69% sunelev=-28.9deg (moon at  37.0deg phase=0.61 elev=-14.0 )
AL_20110808_003023560_000002_09993201    85 stars filter C [16171.9s - 16351.9s] expo=180s elev=19.9deg humid= 67% sunelev=-28.8deg (moon at  37.0deg phase=0.61 elev=-14.0 )
AL_20110808_003334062_000002_09993201    49 stars filter R [16362.4s - 16542.4s] expo=180s elev=19.4deg humid= 64% sunelev=-28.6deg (moon at  37.0deg phase=0.61 elev=-15.0 )
AL_20110808_004347018_000002_09993301    77 stars filter C [16975.4s - 17155.4s] expo=180s elev=17.9deg humid= 62% sunelev=-28.1deg (moon at  37.0deg phase=0.61 elev=-17.0 )
AL_20110808_004657770_000002_09993301    66 stars filter R [17166.1s - 17346.1s] expo=180s elev=17.4deg humid= 62% sunelev=-28.0deg (moon at  37.0deg phase=0.61 elev=-17.0 )
AL_20110808_005008289_000002_09993301    38 stars filter V [17356.7s - 17536.7s] expo=180s elev=16.9deg humid= 63% sunelev=-27.8deg (moon at  37.0deg phase=0.61 elev=-18.0 )
AL_20110808_010835660_000002_09993401    64 stars filter C [18464.1s - 18644.1s] expo=180s elev=14.0deg humid= 71% sunelev=-26.5deg (moon at  37.0deg phase=0.61 elev=-21.0 )
AL_20110808_011146175_000002_09993401    49 stars filter R [18654.6s - 18834.6s] expo=180s elev=13.5deg humid= 70% sunelev=-26.3deg (moon at  37.0deg phase=0.61 elev=-21.0 )
AL_20110808_011456896_000002_09993401    33 stars filter V [18845.3s - 19025.3s] expo=180s elev=13.0deg humid= 72% sunelev=-26.1deg (moon at  37.0deg phase=0.61 elev=-22.0 )
AL_20110808_013326321_000002_09993501     0 star  filter C [19954.7s - 20134.7s] expo=180s elev= 9.9deg humid= 73% sunelev=-24.5deg (moon at  37.0deg phase=0.61 elev=-25.0 )
AL_20110808_013637074_000002_09993501     0 star  filter R [20145.4s - 20325.4s] expo=180s elev= 9.4deg humid= 75% sunelev=-24.2deg (moon at  37.0deg phase=0.61 elev=-25.0 )
AL_20110808_013947784_000002_09993501     0 star  filter V [20336.2s - 20516.2s] expo=180s elev= 8.9deg humid= 75% sunelev=-23.9deg (moon at  37.0deg phase=0.61 elev=-26.0 )
AL_20110808_015821233_000002_09993601     0 star  filter C [21449.7s - 21629.7s] expo=180s elev= 5.7deg humid= 76% sunelev=-22.0deg (moon at  37.0deg phase=0.61 elev=-29.0 )
AL_20110808_020131529_000002_09993601    13 stars filter R [21639.9s - 21819.9s] expo=180s elev= 5.2deg humid= 77% sunelev=-21.7deg (moon at  37.0deg phase=0.61 elev=-30.0 )
AL_20110808_020441828_000002_09993601     7 stars filter V [21830.2s - 22010.2s] expo=180s elev= 4.7deg humid= 77% sunelev=-21.4deg (moon at  37.0deg phase=0.61 elev=-30.0 )
AL_20110808_022310009_000002_09993701     0 star  filter C [22938.4s - 23118.4s] expo=180s elev= 1.6deg humid= 76% sunelev=-19.2deg (moon at  36.0deg phase=0.61 elev=-33.0 )
AL_20110808_022620526_000002_09993701     0 star  filter R [23128.9s - 23308.9s] expo=180s elev= 1.1deg humid= 75% sunelev=-18.8deg (moon at  36.0deg phase=0.61 elev=-34.0 )
Informations from GCN notice:
This is a GRB
Date of GRB : 2455781.3317865739 2011-08-07T19:57:46.359
Date of notice : 2455781.3319560187 2011-08-07T19:58:01.000
Refined position : yes (error radius=4.1 arcsec)
RA(J2000.0) : 278.692000 18h34m46s0
DEC(J2000.0) : -8.766000 -08d45m57s60
Error box : x=67:69 y=56:59 (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=23.245048 lat=-0.319875
NASA/IPAC-Extragalactic-Database tool for calculate an extinction

Extinction from Schlegel et al. (1998, ApJ 500, 525): E(B-V)=1.519
Assuming Rv=3.1: Av=5.037 Ar=4.061 Ai=2.948
extmap.fit: Extinction map E(B-V) from Schlegel:

Field of View is about 55 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
GRBlog
ROTSE last GRB images

Example of a GCNC email for this burst

gcncirc@capella.gsfc.nasa.gov
GRB 110807: 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 110807 detected by SWIFT
(trigger 458907) with the TAROT robotic telescope (D=25cm)
located at the Calern observatory, France.

The observations started 8199.5s after the GRB trigger
(8185.1s after the notice). The elevation of the field decreased from
35 degrees above horizon and weather conditions
were XXX.

---- NO
The date of trigger : t0 = 2011-08-07T19:57:46.656

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+8199.5s to t0+8379.5s : R > 15.1

The second image is 180.0s exposure in tracking mode:
t0+8389.5s to t0+8569.5s : R > 16.2

We co-added a series of exposures:
t0+8389.5s to t0+9579.6s : 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 8199.5s 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= 23.2450 lat= -0.3199
and the galactic extinction in R band is 4.1 magnitudes
estimated from D. Schlegel et al. 1998ApJ...500..525S.

This message may be cited.
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