- GCN NOTICE
TITLE: GCN/FERMI NOTICE
NOTICE_DATE: Sat 16 Jan 10 21:31:05 UT
NOTICE_TYPE: Fermi-GBM Flight Position
RECORD_NUM: 47
TRIGGER_NUM: 285370262
GRB_RA: 299.983d {+19h 59m 56s} (J2000),
300.101d {+20h 00m 24s} (current),
299.395d {+19h 57m 35s} (1950)
GRB_DEC: +12.283d {+12d 16' 60"} (J2000),
+12.311d {+12d 18' 41"} (current),
+12.145d {+12d 08' 43"} (1950)
GRB_ERROR: 13.45 [deg radius, statistical plus systematic]
GRB_INTEN: 203 [cnts/sec]
DATA_SIGNIF: 12.70 [sigma]
INTEG_TIME: 2.048 [sec]
GRB_DATE: 15212 TJD; 16 DOY; 10/01/16
GRB_TIME: 77460.24 SOD {21:31:00.24} UT
GRB_PHI: 350.00 [deg]
GRB_THETA: 30.00 [deg]
DATA_TIME_SCALE: 2.0480 [sec]
HARD_RATIO: 0.80
LOC_ALGORITHM: 3 (version number of)
MOST_LIKELY: 89% GRB
2nd_MOST_LIKELY: 8% Cyg X-1
DETECTORS: 1,0,0, 1,0,0, 0,0,0, 0,0,0, 0,0,
SUN_POSTN: 298.68d {+19h 54m 42s} -20.82d {-20d 49' 25"}
SUN_DIST: 33.16 [deg] Sun_angle= -0.1 [hr] (East of Sun)
MOON_POSTN: 315.72d {+21h 02m 52s} -14.67d {-14d 39' 58"}
MOON_DIST: 31.10 [deg]
MOON_ILLUM: 2 [%]
GAL_COORDS: 51.88, -9.15 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS: 305.21, 32.13 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS: Fermi-GBM Flight-calculated Coordinates.
COMMENTS: This trigger occurred at longitude,latitude = 258.48,-3.93 [deg].
- GCN NOTICE
TITLE: GCN/FERMI NOTICE
NOTICE_DATE: Sat 16 Jan 10 21:31:19 UT
NOTICE_TYPE: Fermi-GBM Ground Position
RECORD_NUM: 56
TRIGGER_NUM: 285370262
GRB_RA: 298.630d {+19h 54m 31s} (J2000),
298.753d {+19h 55m 01s} (current),
298.017d {+19h 52m 04s} (1950)
GRB_DEC: +6.410d {+06d 24' 36"} (J2000),
+6.437d {+06d 26' 13"} (current),
+6.278d {+06d 16' 40"} (1950)
GRB_ERROR: 5.11 [deg radius, statistical only]
DATA_SIGNIF: 14.90 [sigma]
DATA_INTERVAL: 2.048 [sec]
GRB_DATE: 15212 TJD; 16 DOY; 10/01/16
GRB_TIME: 77460.24 SOD {21:31:00.24} UT
GRB_PHI: 351.00 [deg]
GRB_THETA: 36.00 [deg]
E_RANGE: 44.032 - 279.965 [keV]
LOC_ALGORITHM: 413 (Gnd S/W Version number)
UN_POSTN: 298.68d {+19h 54m 42s} -20.82d {-20d 49' 25"}
SUN_DIST: 27.26 [deg] Sun_angle= -0.0 [hr] (East of Sun)
MOON_POSTN: 315.72d {+21h 02m 52s} -14.67d {-14d 39' 55"}
MOON_DIST: 26.99 [deg]
MOON_ILLUM: 2 [%]
GAL_COORDS: 46.03,-10.92 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS: 302.21, 26.70 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS: Fermi-GBM Ground-calculated Coordinates.
COMMENTS: This Notice was ground-generated -- not flight-generated.
- GCN NOTICE
TITLE: GCN/INTEGRAL NOTICE
NOTICE_DATE: Sat 16 Jan 10 21:33:24 UT
NOTICE_TYPE: INTEGRAL SPI ACS Trigger
TRIGGER_NUM: 5974, Sub_Num: 0
GRB_INTEN: 9.12 [sigma]
GRB_TIME: 77544.99 SOD {21:32:24.99} UT
GRB_DATE: 15212 TJD; 16 DOY; 10/01/16
COMMENTS: INTEGRAL SPI_ACS GRB Trigger.
COMMENTS:
COMMENTS: NOTE: This SPIACS event is temporally(84.0<100sec) coincident with the FERMI_GBM event (trignum=285370262).
COMMENTS: ftp://isdcarc.unige.ch/arc/FTP/ibas/spiacs/2010-01/2010-01-16T21-32-24.9339-21359-00007-0.lc
- GCN Circular #10330
M. S. Briggs and V. Connaughton (UA Huntsville),
report on behalf of the Fermi GBM Team:
"At 21:31:00.24 UT on 16 January 2010, the Fermi Gamma-ray Burst Monitor
(GBM) triggered and located GRB 100116A (trigger 285370262 / 100116.897).
The on-ground calculated location, using the Fermi GBM trigger data,
is RA = 301.48, Dec = +16.24 (J2000 degrees, equivalent to
J2000 20h 06m, +16d 14'), with a statistical uncertainty of 1.0 degrees
(radius, 1-sigma containment, statistical only; there is additionally
a systematic error which is currently estimated to be 2 to 3 degrees).
The angle from the Fermi LAT boresight is 29 degrees.
The GBM light curve shows two peaks separated by over 60 seconds with
little or no intervening emission. The total duration is approximately
110 seconds. Both peaks are best fit with a power law function with an
exponential high-energy cutoff. The first peak, fit from -3.072 to
2.048 s, has Epeak = 240 (-40,+60) keV and an index of -0.92 +/- 0.15.
The fluence of this peak is (1.5 +/- 0.1) E-6 ergs / cm**2. The second
peak, fit from 82.949 to 101.38 s, has Epeak = 1240 +/- 90 keV and an
index of -1.02 +/- 0.017. The fluence of this peak is
(3.36 +/- 0.03) E-5 ergs / cm**2.
The spectral analysis results presented above are preliminary;
final results will be published in the GBM GRB Catalog."
- GCN Circular #10333
Julie McEnery (GSFC), Jim Chiang (SLAC), Nicola Omodei (Stanford) and
Tak Nakamori (Tokyo Institute of Technology) report on behalf of the
Fermi LAT team:
At 21:32:36.00 (UT) on 16 Jan 2010, the Fermi Large Area Telescope
(LAT) detected gamma rays from the long GRB 100116A, which was
triggered and located by the Fermi Gamma-ray Burst Monitor (GBM)
(trigger 285370262 / 100116.897, GCN10330). The angle of the GBM best
position (RA, Dec= 301.48, 16.24) with respect to the LAT boresight was
~29 degrees at the time of the LAT detection, which is well within our
field of view.
The data from the Fermi LAT shows an increase in the event rate coincident
with the second peak in the GBM lightcurve (around 90s after the GBM
trigger)
that is spatially correlated with the GBM emission. It is a relatively weak
detection with less than 20 excess events, most with energy below 100 MeV.
The best LAT on-ground localization is found to be (RA, Dec = 305.02,
14.45) (RA=20h 20' 04.80'', Dec=14d 27' 00.0'', J2000) with a 90%
containment radius of 0.30 deg (statistical; 68% containment radius:
0.17 deg)
which is consistent with the GBM localization.
A Swift TOO request cannot be requested due to Sun constraints.
Further analysis is ongoing.
The point of contact for this burst is
Julie McEnery: julie.mcenery@nasa.gov
The Fermi LAT is a pair conversion telescope designed to cover the
energy band from 20 MeV to greater than 300 GeV.
It is the product of an international collaboration between NASA and
DOE in the U.S. and many scientific institutions across France, Italy,
Japan and Sweden.
This message can be cited.
- GCN Circular #10347
S. Golenetskii, R.Aptekar, D. Frederiks, E. Mazets, V. Pal'shin,
P. Oleynik, M. Ulanov, D. Svinkin, and T. Cline on behalf
of the Konus-Wind team, report:
The long hard GRB 100116A (Fermi-GBM trigger 285370262:
Briggs and Connaughton, GCN 10330;
Fermi-LAT localization: McEnery et al., GCN 10333)
triggered Konus-Wind at T0=77543.747s UT (21:32:23.747)
The burst light curve shows a single-pulse structure
with a total duration of ~30 s. A weaker precursor, reported by
Fermi-GBM (GCN 10330) is clearly seen in the low-resolution
background mode data at T0-88s.
The emission is seen up to 10 MeV.
The Konus-Wind light curve of this GRB is available at
http://www.ioffe.ru/LEA/GRBs/GRB100116_T77543/
As observed by Konus-Wind the burst
had a fluence of 5.7(+/-0.6)x10-5 erg/cm2,
and a 256-ms peak flux measured from T0+6.144s
of 4.2(+/-0.4)x10-6 erg/cm2/s
(both in the 20 keV - 10 MeV energy range).
The time-integrated spectrum of the burst
(from T0 to T0+23.296 s) is well be fitted
in the 20 keV - 10 MeV range by a power law
with exponential cutoff model:
dN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep), with
alpha = -0.96(-0.06, +0.07),
and Ep = 968(-130, +163) keV (chi2 = 105/98 dof).
The spectrum of the most intense part of the burst
(measured from T0+0.256 to T0+8.192 s) is well fitted
in the 20 keV - 10 MeV range by a power law
with exponential cutoff model, for which
alpha = -0.96(+/-0.6),
and Ep = 1015(-121, +146) keV (chi2 = 107/101 dof).
All the quoted results are preliminary.
All the quoted errors are at the 90% confidence level.
- GCN Circular #10353
T. Uehara, Y.Hanabata, T. Takahashi, Y. Fukazawa (Hiroshima U.)
K. Yamaoka (Aoyama Gakuin U.), S. Sugita (Nagoya U),
Y. Terada, M. Tashiro, A. Endo, K. Onda, T. Sugasahara, W. Iwakiri (Saitama U.),
M. Ohno, M. Suzuki, M. Kokubun, T. Takahashi (ISAS/JAXA),
Y. E. Nakagawa, T. Tamagawa (RIKEN), N. Ohmori, A. Daikyuji,
E. Sonoda, K. Kono, H. Hayashi, K. Noda, Y. Nishioka, M. Yamauchi
(Univ. of Miyazaki), N. Vasquez (Tokyo Tech.), Y. Urata, H. M. Lin (NCU),
T. Enoto, K. Nakazawa, K. Makishima (Univ. of Tokyo), S. Hong
(Nihon U.), on behalf of the Suzaku WAM team, report:
The long GRB 100116A (Fermi/GBM trigger #285370262 / 100116.89
Briggs et al., GCN 10330, McEnery et al., GCN 10333) triggered the Suzaku
Wide-band All-sky Monitor (WAM) which covers an energy range of 50 keV - 5 MeV
at 21:31:00.15 UT (=T0).
The observed light curve shows two separated pulses, a precursor at T0+0 to T0+4 sec
and a main harder pulse at T0+81 to T0+111 sec, and the duration (T90) was about
96 seconds. The fluences in 100 - 1000 keV were 1.24(-0.16, +0.17) e-6 and 2.89 (-0.08, +0.06) e-5 erg/cm^2
in the precursor and the main pulse, respectively. The 1-s peak flux measured from T0+94 s
was 7.26 (-0.43, +0.47) photons/cm^2/s in the same energy range.
Preliminary result shows that the time-averaged spectrum from
T0+81 s to T0+111 s is well fitted by a power-law with exponential cutoff model:
dN/dE ~ E^{-alpha} * exp(-(2-alpha)*E/Epeak) with
alpha 1.15 (-0.10, +0.09), and
Epeak 1119 (-135, +137) keV (chi^2/d.o.f. = 79.0/54).
Due to the brightness of this burst, a 3% systematic error
was added for low energy channels.
All the quoted errors are at 90% confidence level.
The light curves of this event are available at the following URL:
http://www.astro.isas.jaxa.jp/suzaku/HXD-WAM/WAM-GRB/grb/trig/grb_table.html
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