GRB100917_055307_SWIFT at TAROT Calern observatory

TAROT Calern observatory log of images

AL_20100918_200731764_000001_35488300     0 star  filter V [140460.6s - 140640.6s] expo=180s elev=27.3deg humid= 89% sunelev=-26.3deg (moon at  17.0deg phase=0.72 elev=+28.0 )
AL_20100918_201046022_000001_35488300     0 star  filter R [140654.8s - 140834.8s] expo=180s elev=27.1deg humid= 89% sunelev=-26.8deg (moon at  17.0deg phase=0.72 elev=+28.0 )
AL_20100918_201400209_000001_35488300     1 star  filter I [140849.0s - 141029.0s] expo=180s elev=26.9deg humid= 89% sunelev=-27.3deg (moon at  17.0deg phase=0.72 elev=+28.0 )
AL_20100918_211742342_000001_35488400     2 stars filter V [144671.1s - 144851.1s] expo=180s elev=21.6deg humid= 85% sunelev=-36.0deg (moon at  18.0deg phase=0.73 elev=+27.0 )
AL_20100918_212056585_000001_35488400     1 star  filter R [144865.3s - 145045.3s] expo=180s elev=21.3deg humid= 85% sunelev=-36.4deg (moon at  18.0deg phase=0.73 elev=+27.0 )
AL_20100918_212411007_000001_35488400     0 star  filter I [145059.8s - 145239.8s] expo=180s elev=20.9deg humid= 84% sunelev=-36.8deg (moon at  18.0deg phase=0.73 elev=+27.0 )
AL_20100918_222747418_000001_35488500     4 stars filter V [148876.2s - 149056.2s] expo=180s elev=13.0deg humid= 81% sunelev=-42.6deg (moon at  18.0deg phase=0.73 elev=+22.0 )
AL_20100918_223105146_000001_35488500    17 stars filter R [149073.9s - 149253.9s] expo=180s elev=12.6deg humid= 81% sunelev=-42.8deg (moon at  18.0deg phase=0.73 elev=+21.0 )
AL_20100918_223419583_000001_35488500    11 stars filter I [149268.4s - 149448.4s] expo=180s elev=12.1deg humid= 81% sunelev=-43.0deg (moon at  18.0deg phase=0.73 elev=+21.0 )
No informations from GCN notice.

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=20.284256 lat=-13.238835
NASA/IPAC-Extragalactic-Database tool for calculate an extinction

Extinction from Schlegel et al. (1998, ApJ 500, 525): E(B-V)=0.250
Assuming Rv=3.1: Av=0.827 Ar=0.667 Ai=0.484 Extinction map E(B-V) from Schlegel:

Field of View is about 63 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 100917: TAROT Calern observatory optical observations
Klotz A. (CESR-OMP), Gendre B. (IASF),
Boer M. (OHP-OAMP), Atteia J.L. (LATT-OMP) report:

We imaged the field of GRB 100917 detected by SWIFT
(trigger 434360) with the TAROT robotic telescope (D=25cm)
located at the Calern observatory, France.

The observations started 140460.6s after the GRB trigger
(XXXs after the notice). The elevation of the field decreased from
27 degrees above horizon and weather conditions
were XXX.

---- NO
The date of trigger : t0 = 2010-09-17T05:03:26.208

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+140460.6s to t0+140640.6s : R > 15.1

The second image is 180.0s exposure in tracking mode:
t0+140654.8s to t0+140834.8s : R > 16.2

We co-added a series of exposures:
t0+140654.8s to t0+149056.2s : 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 140460.6s 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= 20.2843 lat=-13.2388
and the galactic extinction in R band is 0.7 magnitudes
estimated from D. Schlegel et al. 1998ApJ...500..525S.

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