GRB150626_202253_SWIFT at TAROT Calern observatory

TAROT Calern observatory log of images

AL_20150626_202459198_000000_00000001     0 star  filter C [   -0.1s -    59.9s] expo= 60s elev=58.8deg humid= 76% sunelev=-9.8deg (moon at  78.0deg phase=0.65 elev=+33.0 )
AL_20150626_202547370_000000_00000001     4 stars filter C [  108.1s -   138.1s] expo= 30s elev=58.7deg humid= 76% sunelev=-10.1deg (moon at  78.0deg phase=0.65 elev=+33.0 )
AL_20150626_202630917_000000_00000001     4 stars filter C [  151.6s -   181.6s] expo= 30s elev=58.6deg humid= 76% sunelev=-10.2deg (moon at  78.0deg phase=0.65 elev=+33.0 )
AL_20150626_202714214_000000_00000001     4 stars filter C [  194.9s -   224.9s] expo= 30s elev=58.5deg humid= 76% sunelev=-10.3deg (moon at  78.0deg phase=0.65 elev=+33.0 )
AL_20150626_202758214_000000_00000001     4 stars filter C [  238.9s -   268.9s] expo= 30s elev=58.5deg humid= 76% sunelev=-10.3deg (moon at  78.0deg phase=0.65 elev=+33.0 )
AL_20150626_202842198_000000_00000001     5 stars filter C [  282.9s -   312.9s] expo= 30s elev=58.4deg humid= 76% sunelev=-10.4deg (moon at  78.0deg phase=0.65 elev=+33.0 )
AL_20150626_202951932_000000_00000001     0 star  filter C [  266.9s -   356.9s] expo= 90s elev=58.4deg humid= 75% sunelev=-10.4deg (moon at  78.0deg phase=0.65 elev=+32.0 )
AL_20150626_203401667_000003_46821001     6 stars filter C [  482.3s -   572.3s] expo= 90s elev=58.1deg humid= 75% sunelev=-10.8deg (moon at  78.0deg phase=0.65 elev=+32.0 )
AL_20150626_203444349_000003_46821001     0 star  filter C [  586.3s -   676.3s] expo= 90s elev=57.9deg humid= 75% sunelev=-11.0deg (moon at  78.0deg phase=0.65 elev=+32.0 )
AL_20150626_203920896_000003_46821101     6 stars filter C [  801.6s -   891.6s] expo= 90s elev=57.6deg humid= 75% sunelev=-11.5deg (moon at  78.0deg phase=0.65 elev=+32.0 )
AL_20150626_204104912_000003_46821101     7 stars filter C [  905.6s -   995.6s] expo= 90s elev=57.4deg humid= 75% sunelev=-11.7deg (moon at  78.0deg phase=0.65 elev=+32.0 )
AL_20150626_204248427_000003_46821101     7 stars filter C [ 1009.1s -  1099.1s] expo= 90s elev=57.3deg humid= 76% sunelev=-11.9deg (moon at  78.0deg phase=0.65 elev=+32.0 )
Informations from GCN notice:
This is a GRB
Date of the alert : 2457200.34922 2015-06-26T20:22:52.608
Decoded useful notice informations.
RA(J2000.0) : 187.6341 12h30m32s1
DEC(J2000.0) : 66.7721 +66d46m19s56
Error radius : 2.2 arcsec
Error box : x=79:81 y=55:56 (pixels)

Other pages about TAROT Calern observatory observations

Sum of images.
Differential photometry.

Galactic coordinates

Galactic coordinates : lon=126.125770614 lat=50.2200800716
NASA/IPAC-Extragalactic-Database tool for calculate an extinction

Extinction from Schlegel et al. (1998, ApJ 500, 525): E(B-V)=0.015
Assuming Rv=3.1: Av=0.049 Ar=0.039 Ai=0.029 Extinction map E(B-V) from Schlegel:

Field of View is about 115 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 150626: 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 150626 detected by SWIFT
(trigger 646786) with the TAROT robotic telescope (D=25cm)
located at the Calern observatory, France.

The observations started -0.1s after the GRB trigger
(-41.6s after the notice). The elevation of the field decreased from
58 degrees above horizon and weather conditions
were XXX.

---- NO
The date of trigger : t0 = 2015-06-26T20:22:52.608

The first image is trailed with a duration of 60.0s
(see the description in Klotz et al., 2006, A&A 451, L39).
We do not detect any OT with a limiting magnitude of:
t0+-0.1s to t0+59.9s : R > 15.1

The second image is 30.0s exposure in tracking mode:
t0+108.1s to t0+138.1s : R > 16.2

We co-added a series of exposures:
t0+108.1s to t0+356.9s : 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 -0.1s 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=126.1258 lat=+50.2201
and the galactic extinction in R band is 0.0 magnitudes
estimated from D. Schlegel et al. 1998ApJ...500..525S.

This message may be cited.