GRB150901_152636_SWIFT at TAROT Calern observatory

TAROT Calern observatory log of images

AL_20150901_184944354_000003_49778901     0 star  filter C [12003.5s - 12183.5s] expo=180s elev=19.9deg humid= 73% sunelev=-7.5deg (moon at 144.0deg phase=0.76 elev=-10.0 )
AL_20150901_185256776_000003_49778901     0 star  filter C [12195.9s - 12375.9s] expo=180s elev=19.3deg humid= 74% sunelev=-8.1deg (moon at 144.0deg phase=0.76 elev=-10.0 )
AL_20150901_185608229_000003_49778901     0 star  filter R [12387.4s - 12567.4s] expo=180s elev=18.8deg humid= 74% sunelev=-8.6deg (moon at 144.0deg phase=0.76 elev= -9.0 )
Informations from GCN notice:
This is a GRB
Date of the alert : 2457267.14347 2015-09-01T15:26:35.808
Decoded useful notice informations.
RA(J2000.0) : 183.5857 12h14m20s5
DEC(J2000.0) : 25.0385 +25d02m18s59
Error radius : 3.0 arcmin

Other pages about TAROT Calern observatory observations

Sum of images.
Differential photometry.

Galactic coordinates

Galactic coordinates : lon=224.943770764 lat=81.4152949074
NASA/IPAC-Extragalactic-Database tool for calculate an extinction

Extinction from Schlegel et al. (1998, ApJ 500, 525): E(B-V)=0.026
Assuming Rv=3.1: Av=0.086 Ar=0.069 Ai=0.050 Extinction map E(B-V) from Schlegel:

Field of View is about 523 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 150901: TAROT Calern observatory optical observations
Klotz A., Turpin D. (IRAP-CNRS-OMP),
Boer M., Gendre B., Siellez K., Dereli H., Bardho O. (UNS-CNRS-OCA),
Atteia J.L. (IRAP-CNRS-OMP) report:

We imaged the field of GRB 150901 detected by SWIFT
(trigger 654042) with the TAROT robotic telescope (D=25cm)
located at the Calern observatory, France.

The observations started 3.33h after the GRB trigger.
The elevation of the field decreased from
19 degrees above horizon and weather conditions
were XXX.

---- NO
The date of trigger : t0 = 2015-09-01T15:26:35.808

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+12003.5s to t0+12183.5s : R > 15.1

The second image is 180.0s exposure in tracking mode:
t0+12195.9s to t0+12375.9s : R > 16.2

We co-added a series of exposures:
t0+12195.9s to t0+12567.4s : 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 3.33h 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=224.9438 lat=+81.4153
and the galactic extinction in R band is 0.1 magnitudes
estimated from D. Schlegel et al. 1998ApJ...500..525S.

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