Gamma-ray Burst 141205A
(All information courtesy of the instrument teams.)
Previous IAU Circulars
Results of Observations
- GCN Circular #17137
J. R. Cummings reports on behalf of the Swift science team:
At 08:05:17, BAT triggered on GRB 141205A (trigger 620534). No source was
found onboard. A significant source was found in ground analysis at
RA, Dec 92.881, +37.862, which is:
RA (J2000) 06h 11m 31.5s
Dec (J2000) 37d 51' 43"
with an estimated position uncertainty of 3 arcmin radius.
This was the same event as Fermi GBM trigger 439459520. The BAT position is
14.0 degrees from the GBM final position (4.4 degree radius 1 sigma error).
The burst was about 1 second long.
A Swift TOO has been requested.
- GCN Circular #17140
C. B. Markwardt (GSFC), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC),
J. R. Cummings, N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), A. Y. Lien (GSFC/UMBC),
D. M. Palmer (LANL), T. Sakamoto (AGU), M. Stamatikos (OSU), J. Tueller (GSFC),
T. N. Ukwatta (LANL), A. Vargas (PSU)
(i.e. the Swift-BAT team):
We report further analysis of GRB 141205A (Cummings, GCN 17137). The best
BAT position is RA, Dec 92.859, +37.876, which is:
RA (J2000) 06 11 26.1s
Dec (J2000) +37d 52' 32.2"
with an estimated position uncertainty of 2 arcmin radius. The source was
41% coded in BAT.
The unweighted lightcurve shows multiple weak peaks. T90 was 1.1 +- 0.2
The total spectrum in BAT is best fit by a simple power-law function with
a photon index of 0.985 +- 0.002. The fluence in 1.4 seconds was
(1.2 +- 0.3) x 10^-7 ergs/cm^2. Errors are 90% confidence.
Because this burst was found in ground analysis, the normal automated burst
analysis products are not available.
- GCN Circular #17141
R. L. C. Starling and K. L. Page (U. Leicester) report
The Swift ground-analysis-detected short/hard GRB 141205A (Cummings et al. GCN 17137, 17140)
was observed with XRT on 2014-12-05 starting at 14:44 UT, 6.65 hours after the burst, and ending
at 2014-12-05 at 17:55 UT.
The Photon Counting mode data comprise 4.97 ks of exposure, in which no new source is detected
to a 3-sigma limit in the 0.3-10 keV band of 2.8e-3 count/s.
This circular is an official product of the Swift XRT team.
- GCN Circular #17142
D. Xu (DARK/NBI), H.-B. Niu, A. Esamdin, L. Ma (XAO) report:
We observed the field of GRB 141205A (Cummings, GCN 17137), using the
1m telescope located at Nanshan, Xinjiang, China. Observations were
performed between 17:26:18 UT and 21:26:52 UT on 2014-12-05, and a
series of R-band 120s/200s exposures were obtained. No credible
uncatalogued optical transient was found within the BAT error circle
(Markwardt et al., GCN 17140), down to a limiting magnitude of R~20.4
- GCN Circular #17143
O.J. Roberts (UCD) reports on behalf of the Fermi GBM Team:
"At 08:05:17.49 UT on the 5th of December 2014, the Fermi
Gamma-Ray Burst Monitor triggered and located GRB 141205A
(trigger 439459520 / 141205337 ), which was also detected by
Swift (Cummings et al. 2014, GCN 17137). The GBM on-ground
location, using the Fermi GBM trigger data, is consistent
with the Swift location.
The angle from the Fermi LAT boresight is about 123 degrees.
The GBM light curve consists of a single peak with a duration
(T90) of about 1.5 s (50-300 keV). The time-averaged spectrum
from T0-0.26 s to T0+1.3 s is adequately fit by a power law
function with an exponential high-energy cutoff. The power law
index is -0.23 +/- 0.39 and the cutoff energy, parameterized
as Epeak, is 525 +/- 164 keV.
The event fluence (10-1000 keV) in this time interval is
(1.1 +/- 0.2)E-06 erg/cm^2. The 1-sec peak photon flux
measured starting from T0-0.1 s in the 10-1000 keV band
is 2.5 +/- 0.3 ph/s/cm^2.
The spectral analysis results presented above are preliminary;
final results will be published in the GBM GRB Catalog."
- GCN Circular #17144
M. M. Chester (PSU), F. E. Marshall (NASA/GSFC), and
R. L. C. Starling (U.Leicester) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 141205A
23934 s after the BAT trigger (Cummings, GCN Circ. 17137).
No new sources are detected within the refined BAT error circle
(Markwardt et al. GCN Circ. 17140). Using the UVOT photometric system
(Breeveld et al. 2011, AIP Conf. Proc. 1358, 373), we find the following
3-sigma upper limits at the center of the BAT error circle:
Filter T_start(s) T_stop(s) Exp(s) Mag
white 23975 28936 837 >21.7
v 24016 29758 826 >20.1
u 23934 28114 837 >20.7
The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.24 in the direction of the burst
(Schlegel et al. 1998).
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Jochen Greiner, last update: 06-Dec-2014