GRB160225_142057_SWIFT at TAROT Calern observatory

TAROT Calern observatory log of images

AL_20160225_194718066_000000_13512801     5 stars filter C [19396.0s - 19576.0s] expo=180s elev=47.0deg humid= 86% sunelev=-27.8deg (moon at  60.0deg phase=0.81 elev= -3.0 )
AL_20160225_195029706_000000_13512801     4 stars filter R [19587.6s - 19767.6s] expo=180s elev=47.4deg humid= 86% sunelev=-28.3deg (moon at  60.0deg phase=0.81 elev= -3.0 )
AL_20160225_195340487_000000_13512801     3 stars filter V [19778.4s - 19958.4s] expo=180s elev=47.9deg humid= 86% sunelev=-28.9deg (moon at  60.0deg phase=0.81 elev= -2.0 )
AL_20160225_201147583_000000_13512901     1 star  filter C [20865.6s - 21045.6s] expo=180s elev=50.5deg humid= 84% sunelev=-32.0deg (moon at  61.0deg phase=0.81 elev= +0.0 )
AL_20160225_201459005_000000_13512901     1 star  filter R [21057.1s - 21237.1s] expo=180s elev=51.0deg humid= 84% sunelev=-32.5deg (moon at  61.0deg phase=0.81 elev= +1.0 )
AL_20160225_201810463_000000_13512901     3 stars filter V [21248.5s - 21428.5s] expo=180s elev=51.4deg humid= 84% sunelev=-33.1deg (moon at  61.0deg phase=0.81 elev= +1.0 )
AL_20160225_203626530_000000_13513001     3 stars filter C [22344.6s - 22524.6s] expo=180s elev=54.1deg humid= 83% sunelev=-36.1deg (moon at  61.0deg phase=0.81 elev= +4.0 )
AL_20160225_203937230_000000_13513001     3 stars filter R [22535.4s - 22715.4s] expo=180s elev=54.6deg humid= 83% sunelev=-36.6deg (moon at  61.0deg phase=0.81 elev= +5.0 )
AL_20160225_204248277_000000_13513001     3 stars filter V [22726.4s - 22906.4s] expo=180s elev=55.1deg humid= 82% sunelev=-37.1deg (moon at  61.0deg phase=0.81 elev= +5.0 )
AL_20160225_210049157_000000_13513101     4 stars filter C [23807.3s - 23987.3s] expo=180s elev=57.8deg humid= 82% sunelev=-40.0deg (moon at  61.0deg phase=0.80 elev= +8.0 )
AL_20160225_210400157_000000_13513101     4 stars filter R [23998.2s - 24178.2s] expo=180s elev=58.2deg humid= 82% sunelev=-40.5deg (moon at  61.0deg phase=0.80 elev= +9.0 )
AL_20160225_210710876_000000_13513101     3 stars filter V [24189.0s - 24369.0s] expo=180s elev=58.7deg humid= 82% sunelev=-40.9deg (moon at  61.0deg phase=0.80 elev= +9.0 )
AL_20160225_212521656_000000_13513201     4 stars filter C [25279.7s - 25459.7s] expo=180s elev=61.4deg humid= 84% sunelev=-43.6deg (moon at  61.0deg phase=0.80 elev=+12.0 )
AL_20160225_212832868_000000_13513201     4 stars filter R [25470.9s - 25650.9s] expo=180s elev=61.9deg humid= 84% sunelev=-44.1deg (moon at  61.0deg phase=0.80 elev=+13.0 )
AL_20160225_213143384_000000_13513201     3 stars filter V [25661.5s - 25841.5s] expo=180s elev=62.4deg humid= 85% sunelev=-44.5deg (moon at  61.0deg phase=0.80 elev=+14.0 )
AL_20160225_214949309_000000_13513301     4 stars filter C [26747.4s - 26927.4s] expo=180s elev=65.0deg humid= 81% sunelev=-47.0deg (moon at  61.0deg phase=0.80 elev=+16.0 )
AL_20160225_215300543_000000_13513301     4 stars filter R [26938.6s - 27118.6s] expo=180s elev=65.5deg humid= 80% sunelev=-47.4deg (moon at  61.0deg phase=0.80 elev=+17.0 )
AL_20160225_215611512_000000_13513301     3 stars filter V [27129.6s - 27309.6s] expo=180s elev=66.0deg humid= 79% sunelev=-47.8deg (moon at  61.0deg phase=0.80 elev=+18.0 )
Informations from GCN notice:
This is a GRB
Date of the alert : 2457444.09788 2016-02-25T14:20:56.832
Decoded useful notice informations.
RA(J2000.0) : 164.2284 10h56m54s8
DEC(J2000.0) : 53.6699 +53d40m11s63
Error radius : 3.6 arcsec
Error box : x=72:74 y=79:81 (pixels)

Other pages about TAROT Calern observatory observations

Sum of images.
Differential photometry.

Galactic coordinates

Galactic coordinates : lon=153.549514478 lat=56.1285433442
NASA/IPAC-Extragalactic-Database tool for calculate an extinction

Extinction from Schlegel et al. (1998, ApJ 500, 525): E(B-V)=0.008
Assuming Rv=3.1: Av=0.028 Ar=0.022 Ai=0.016 Extinction map E(B-V) from Schlegel:

Field of View is about 134 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 160225: 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 160225 detected by SWIFT
(trigger 675998) with the TAROT robotic telescope (D=25cm)
located at the Calern observatory, France.

The observations started 5.39h after the GRB trigger.
The elevation of the field increased from
46 degrees above horizon and weather conditions
were XXX.

---- NO
The date of trigger : t0 = 2016-02-25T14:20:56.832

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+19396.0s to t0+19576.0s : R > 15.1

The second image is 180.0s exposure in tracking mode:
t0+19587.6s to t0+19767.6s : R > 16.2

We co-added a series of exposures:
t0+19587.6s to t0+22524.6s : 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 5.39h 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=153.5495 lat=+56.1285
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.