- GCN NOTICE
TITLE: GCN/FERMI NOTICE
NOTICE_DATE: Wed 14 Apr 10 02:20:31 UT
NOTICE_TYPE: Fermi-GBM Flight Position
RECORD_NUM: 48
TRIGGER_NUM: 292904423
GRB_RA: 183.617d {+12h 14m 28s} (J2000),
183.747d {+12h 14m 59s} (current),
182.982d {+12h 11m 56s} (1950)
GRB_DEC: +20.450d {+20d 26' 60"} (J2000),
+20.393d {+20d 23' 34"} (current),
+20.728d {+20d 43' 41"} (1950)
GRB_ERROR: 11.23 [deg radius, statistical plus systematic]
GRB_INTEN: 232 [cnts/sec]
DATA_SIGNIF: 15.10 [sigma]
INTEG_TIME: 2.048 [sec]
GRB_DATE: 15300 TJD; 104 DOY; 10/04/14
GRB_TIME: 8421.99 SOD {02:20:21.99} UT
GRB_PHI: 174.00 [deg]
GRB_THETA: 55.00 [deg]
DATA_TIME_SCALE: 2.0480 [sec]
HARD_RATIO: 0.38
LOC_ALGORITHM: 3 (version number of)
MOST_LIKELY: 96% GRB
2nd_MOST_LIKELY: 3% Generic Transient
DETECTORS: 0,0,0, 0,0,0, 1,1,0, 0,0,0, 0,0,
SUN_POSTN: 22.26d {+01h 29m 02s} +9.32d {+09d 19' 29"}
SUN_DIST: 145.15 [deg] Sun_angle= -10.8 [hr] (East of Sun)
MOON_POSTN: 15.75d {+01h 03m 00s} +12.11d {+12d 06' 20"}
MOON_DIST: 145.42 [deg]
MOON_ILLUM: 0 [%]
GAL_COORDS: 249.28, 79.23 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS: 174.82, 20.12 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS: Fermi-GBM Flight-calculated Coordinates.
COMMENTS: This trigger occurred at longitude,latitude = 288.53,19.68 [deg].
- GCN NOTICE
TITLE: GCN/FERMI NOTICE
NOTICE_DATE: Wed 14 Apr 10 02:20:51 UT
NOTICE_TYPE: Fermi-GBM Ground Position
RECORD_NUM: 57
TRIGGER_NUM: 292904423
GRB_RA: 255.150d {+17h 00m 36s} (J2000),
255.353d {+17h 01m 25s} (current),
254.165d {+16h 56m 40s} (1950)
GRB_DEC: -52.130d {-52d 07' 47"} (J2000),
-52.145d {-52d 08' 39"} (current),
-52.056d {-52d 03' 22"} (1950)
GRB_ERROR: 1.10 [deg radius, statistical only]
DATA_SIGNIF: 35.00 [sigma]
DATA_INTERVAL: 2.048 [sec]
GRB_DATE: 15300 TJD; 104 DOY; 10/04/14
GRB_TIME: 8421.99 SOD {02:20:21.99} UT
GRB_PHI: 199.00 [deg]
GRB_THETA: 148.00 [deg]
E_RANGE: 44.032 - 279.965 [keV]
LOC_ALGORITHM: 413 (Gnd S/W Version number)
SUN_POSTN: 22.26d {+01h 29m 02s} +9.32d {+09d 19' 30"}
SUN_DIST: 119.44 [deg] Sun_angle= 8.5 [hr] (West of Sun)
MOON_POSTN: 15.75d {+01h 03m 01s} +12.11d {+12d 06' 24"}
MOON_DIST: 117.98 [deg]
MOON_ILLUM: 0 [%]
GAL_COORDS: 336.06, -6.08 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS: 259.61,-29.22 [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/FERMI NOTICE
NOTICE_DATE: Wed 14 Apr 10 02:20:46 UT
NOTICE_TYPE: Fermi-GBM Flight Position
RECORD_NUM: 59
TRIGGER_NUM: 292904423
GRB_RA: 185.800d {+12h 23m 12s} (J2000),
185.930d {+12h 23m 43s} (current),
185.167d {+12h 20m 40s} (1950)
GRB_DEC: +15.783d {+15d 46' 60"} (J2000),
+15.726d {+15d 43' 35"} (current),
+16.060d {+16d 03' 38"} (1950)
GRB_ERROR: 5.22 [deg radius, statistical plus systematic]
GRB_INTEN: 750 [cnts/sec]
DATA_SIGNIF: 64.60 [sigma]
INTEG_TIME: 4.096 [sec]
GRB_DATE: 15300 TJD; 104 DOY; 10/04/14
GRB_TIME: 8421.99 SOD {02:20:21.99} UT
GRB_PHI: 174.00 [deg]
GRB_THETA: 60.00 [deg]
DATA_TIME_SCALE: 4.0960 [sec]
HARD_RATIO: 0.30
LOC_ALGORITHM: 3 (version number of)
MOST_LIKELY: 96% GRB
2nd_MOST_LIKELY: 3% Generic Transient
DETECTORS: 0,0,0, 0,0,0, 1,1,0, 0,0,0, 0,0,
SUN_POSTN: 22.26d {+01h 29m 02s} +9.32d {+09d 19' 30"}
SUN_DIST: 150.18 [deg] Sun_angle= -10.9 [hr] (East of Sun)
MOON_POSTN: 15.75d {+01h 03m 01s} +12.11d {+12d 06' 23"}
MOON_DIST: 150.52 [deg]
MOON_ILLUM: 0 [%]
GAL_COORDS: 271.48, 76.90 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS: 178.86, 16.75 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS: Fermi-GBM Flight-calculated Coordinates.
COMMENTS: This trigger occurred at longitude,latitude = 288.53,19.68 [deg].
- GCN NOTICE
TITLE: GCN/FERMI NOTICE
NOTICE_DATE: Wed 14 Apr 10 02:20:57 UT
NOTICE_TYPE: Fermi-GBM Ground Position
RECORD_NUM: 61
TRIGGER_NUM: 292904423
GRB_RA: 252.550d {+16h 50m 12s} (J2000),
252.760d {+16h 51m 03s} (current),
251.529d {+16h 46m 07s} (1950)
GRB_DEC: -55.230d {-55d 13' 47"} (J2000),
-55.247d {-55d 14' 48"} (current),
-55.144d {-55d 08' 38"} (1950)
GRB_ERROR: 1.08 [deg radius, statistical only]
DATA_SIGNIF: 72.20 [sigma]
DATA_INTERVAL: 4.096 [sec]
GRB_DATE: 15300 TJD; 104 DOY; 10/04/14
GRB_TIME: 8421.99 SOD {02:20:21.99} UT
GRB_PHI: 193.00 [deg]
GRB_THETA: 149.00 [deg]
E_RANGE: 44.032 - 279.965 [keV]
LOC_ALGORITHM: 413 (Gnd S/W Version number)
SUN_POSTN: 22.26d {+01h 29m 02s} +9.32d {+09d 19' 30"}
SUN_DIST: 119.40 [deg] Sun_angle= 8.6 [hr] (West of Sun)
MOON_POSTN: 15.75d {+01h 03m 01s} +12.11d {+12d 06' 25"}
MOON_DIST: 118.41 [deg]
MOON_ILLUM: 0 [%]
GAL_COORDS: 332.66, -6.80 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS: 258.30,-32.50 [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/FERMI NOTICE
NOTICE_DATE: Wed 14 Apr 10 02:21:04 UT
NOTICE_TYPE: Fermi-GBM Ground Position
RECORD_NUM: 70
TRIGGER_NUM: 292904423
GRB_RA: 215.540d {+14h 22m 10s} (J2000),
215.673d {+14h 22m 42s} (current),
214.894d {+14h 19m 35s} (1950)
GRB_DEC: -2.100d {-02d 06' 00"} (J2000),
-2.147d {-02d 08' 47"} (current),
-1.873d {-01d 52' 20"} (1950)
GRB_ERROR: 1.00 [deg radius, statistical only]
DATA_SIGNIF: 73.10 [sigma]
DATA_INTERVAL: 4.096 [sec]
GRB_DATE: 15300 TJD; 104 DOY; 10/04/14
GRB_TIME: 8421.99 SOD {02:20:21.99} UT
GRB_PHI: 195.00 [deg]
GRB_THETA: 88.00 [deg]
E_RANGE: 44.032 - 279.965 [keV]
LOC_ALGORITHM: 413 (Gnd S/W Version number)
SUN_POSTN: 22.26d {+01h 29m 02s} +9.32d {+09d 19' 30"}
SUN_DIST: 164.85 [deg] Sun_angle= 11.1 [hr] (West of Sun)
MOON_POSTN: 15.76d {+01h 03m 01s} +12.11d {+12d 06' 27"}
MOON_DIST: 157.89 [deg]
MOON_ILLUM: 0 [%]
GAL_COORDS: 343.31, 53.50 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS: 213.95, 11.39 [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/FERMI NOTICE
NOTICE_DATE: Wed 14 Apr 10 02:21:05 UT
NOTICE_TYPE: Fermi-GBM Flight Position
RECORD_NUM: 72
TRIGGER_NUM: 292904423
GRB_RA: 186.217d {+12h 24m 52s} (J2000),
186.347d {+12h 25m 23s} (current),
185.584d {+12h 22m 20s} (1950)
GRB_DEC: +15.350d {+15d 20' 60"} (J2000),
+15.293d {+15d 17' 35"} (current),
+15.627d {+15d 37' 37"} (1950)
GRB_ERROR: 4.18 [deg radius, statistical plus systematic]
GRB_INTEN: 1115 [cnts/sec]
DATA_SIGNIF: 94.40 [sigma]
INTEG_TIME: 4.096 [sec]
GRB_DATE: 15300 TJD; 104 DOY; 10/04/14
GRB_TIME: 8421.99 SOD {02:20:21.99} UT
GRB_PHI: 174.00 [deg]
GRB_THETA: 60.00 [deg]
DATA_TIME_SCALE: 4.0960 [sec]
HARD_RATIO: 0.54
LOC_ALGORITHM: 3 (version number of)
MOST_LIKELY: 95% GRB
2nd_MOST_LIKELY: 4% Generic Transient
DETECTORS: 0,0,0, 0,0,0, 1,1,0, 0,0,0, 0,0,
SUN_POSTN: 22.26d {+01h 29m 02s} +9.32d {+09d 19' 30"}
SUN_DIST: 150.77 [deg] Sun_angle= -10.9 [hr] (East of Sun)
MOON_POSTN: 15.76d {+01h 03m 01s} +12.11d {+12d 06' 27"}
MOON_DIST: 151.06 [deg]
MOON_ILLUM: 0 [%]
GAL_COORDS: 273.92, 76.70 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS: 179.43, 16.52 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS: Fermi-GBM Flight-calculated Coordinates.
COMMENTS: This trigger occurred at longitude,latitude = 288.53,19.68 [deg].
- GCN NOTICE
TITLE: GCN/FERMI NOTICE
NOTICE_DATE: Wed 14 Apr 10 02:21:15 UT
NOTICE_TYPE: Fermi-GBM Ground Position
RECORD_NUM: 91
TRIGGER_NUM: 292904423
GRB_RA: 183.720d {+12h 14m 53s} (J2000),
183.851d {+12h 15m 24s} (current),
183.084d {+12h 12m 20s} (1950)
GRB_DEC: +14.410d {+14d 24' 36"} (J2000),
+14.353d {+14d 21' 10"} (current),
+14.688d {+14d 41' 16"} (1950)
GRB_ERROR: 1.00 [deg radius, statistical only]
DATA_SIGNIF: 107.10 [sigma]
DATA_INTERVAL: 4.096 [sec]
GRB_DATE: 15300 TJD; 104 DOY; 10/04/14
GRB_TIME: 8421.99 SOD {02:20:21.99} UT
GRB_PHI: 171.00 [deg]
GRB_THETA: 60.00 [deg]
E_RANGE: 44.032 - 279.965 [keV]
LOC_ALGORITHM: 413 (Gnd S/W Version number)
SUN_POSTN: 22.26d {+01h 29m 02s} +9.33d {+09d 19' 30"}
SUN_DIST: 150.10 [deg] Sun_angle= -10.8 [hr] (East of Sun)
MOON_POSTN: 15.76d {+01h 03m 02s} +12.11d {+12d 06' 29"}
MOON_DIST: 151.03 [deg]
MOON_ILLUM: 0 [%]
GAL_COORDS: 267.29, 74.69 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS: 177.55, 14.67 [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/FERMI NOTICE
NOTICE_DATE: Wed 14 Apr 10 02:21:10 UT
NOTICE_TYPE: Fermi-GBM Ground Position
RECORD_NUM: 71
TRIGGER_NUM: 292904423
GRB_RA: 214.620d {+14h 18m 29s} (J2000),
214.749d {+14h 19m 00s} (current),
213.993d {+14h 15m 58s} (1950)
GRB_DEC: +4.850d {+04d 50' 60"} (J2000),
+4.803d {+04d 48' 11"} (current),
+5.080d {+05d 04' 48"} (1950)
GRB_ERROR: 1.49 [deg radius, statistical only]
DATA_SIGNIF: 92.10 [sigma]
DATA_INTERVAL: 4.096 [sec]
GRB_DATE: 15300 TJD; 104 DOY; 10/04/14
GRB_TIME: 8421.99 SOD {02:20:21.99} UT
GRB_PHI: 197.00 [deg]
GRB_THETA: 81.00 [deg]
E_RANGE: 44.032 - 279.965 [keV]
LOC_ALGORITHM: 413 (Gnd S/W Version number)
SUN_POSTN: 22.26d {+01h 29m 02s} +9.33d {+09d 19' 30"}
SUN_DIST: 161.17 [deg] Sun_angle= 11.2 [hr] (West of Sun)
MOON_POSTN: 15.76d {+01h 03m 01s} +12.11d {+12d 06' 28"}
MOON_DIST: 154.65 [deg]
MOON_ILLUM: 0 [%]
GAL_COORDS: 349.75, 59.56 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS: 210.64, 17.62 [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 Circular #10594
Hiromitsu Takahashi (Hiroshima Univ.), Masanori Ohno (ISAS/JAXA), Nicola Omodei (Stanford Univ.) report on behalf of the Fermi Large Area Telescope collaboration
At 02:20:21 UT on 14th April 2010, the Fermi Large Area Telescope (LAT) detected gamma rays from the long GRB 100414A, which was triggered and located by the Fermi Gamma-ray Burst Monitor (GBM) (trigger 292904423/100414.097).
At the time of the trigger the GRB was approximately at 70 degrees with respect to the LAT boresight which is close the edge of the LAT field of view.
The GBM trigger caused an Autonomous Repoint Request, and the spacecraft moved to point at the GBM location.
The data from the Fermi LAT show significantly detected emission from a transient point source as late as 300 seconds after the GBM trigger.
The best LAT on-ground localization is found to be RA,Dec= 191.59, 8.57; (12:46:21.60, 08:34:12.0, J2000) with a 90% containment radius of 0.18 deg (statistical; 68% containment radius: 0.14 deg, preliminary systematic error is less than 0.1 deg).
More than 20 photons above 100 MeV are observed within 300 seconds, and the highest energy photon coincident with the GRB position is a 4 GeV event which is observed 40 seconds after the GBM trigger.
Further analysis is ongoing.
The point of contact for this burst is Hiromitsu Takahashi
(hirotaka@hep01.hepl.hiroshima-u.ac.jp)
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.
- GCN Circular #10595
S. Foley (MPE) reports on behalf of the Fermi GBM Team:
"At 02:20:21.99 UT on 14 April 2010, the Fermi Gamma-Ray Burst Monitor
triggered and located GRB 100414A (trigger 292904423 / 100414097).
The Fermi Observatory executed a maneuver following this trigger and
tracked the burst location for the next 5 hours, subject to
Earth-angle constraints.
The on-ground calculated location, using the GBM trigger
data, is RA = 184.51, DEC = 9.65 (J2000 degrees,
equivalent to 12 h 18 m, 09 d 39 '), with an uncertainty
of 1.0 degree (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 65 degrees.
The GBM light curve consists of one main pulse
with a duration (T90) of about 26.4 (+/-1.6) s (50-300 keV).
The time-averaged spectrum from T0+2.3 s to T0+28.9 s is
well fit by a power law function with an exponential
high energy cutoff. The power law index is -0.58 (+/- 0.01) and
the cutoff energy, parameterized as Epeak, is 627.6 (+12.5/-12.1)
keV (CSTAT 1075.2 for 480 d.o.f.).
The event fluence (8-1000 keV) in this time interval is
(1.29 +/- 0.02)E-4 erg/cm^2. The 1-sec peak photon flux measured
starting from T0+22.8 s in the 8-1000 keV band
is 18.22 +/- 0.24 ph/s/cm^2.
The spectral analysis results presented above are preliminary;
final results will be published in the GBM GRB Catalog."
- GCN Circular #10597
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 bright hard GRB 100414B (localized by Fermi-LAT;
Takahashi et al., GCN 10594) triggered Konus-Wind
at T0=08427.289s UT (02:20:27.289)
The burst light curve consists of a single slowly
rising pulse which ends abruptly after a culmination
at T0+22.528. A total duration of the burst is ~25 s.
No spectral evolution is apparent in the course of the burst.
The Konus-Wind light curve of this GRB is available at
http://www.ioffe.ru/LEA/GRBs/GRB100414_T08427/
As observed by Konus-Wind the burst
had a fluence of 1.06(+/-0.06)x10-4 erg/cm2,
and a 256-ms peak flux measured from T0+22.528s
of 8.6(+/-0.6)x10-6 erg/cm2/s
(both in the 20 keV - 5 MeV energy range).
The time-integrated spectrum of the burst
(from T0 to T0+25.856 s) is well fitted
in the 20 keV - 5 MeV range by the GRB (Band)
model, for which:
the low-energy photon index alpha = -0.46 (-/+0.07),
the high energy photon index beta = -3.2(-1.5, +0.4),
the peak energy Ep = 547(-21, +22)keV (chi2 = 97/76 dof).
The spectrum at the maximum count rate
(measured from T0+19.200 to T0+25.586 s) is best fit
in the 20 keV - 5 MeV range by a power law
with exponential cutoff model, for which
alpha = -0.81(+/-0.1),
and Ep = 595(-62, +75) keV (chi2 = 75/77 dof).
All the quoted results are preliminary.
All the quoted errors are at the 90% confidence level.
- GCN Circular #10598
D. Frederiks, on behalf of Konus-Wind team, report:
The correct designation of the burst reported in the GCN 10597
is GRB 100414A (not GRB 100414B).
- GCN Circular #10599
S. Golenetskii, R. Aptekar, E. Mazets, V. Pal'shin, D. Frederiks, P.
Oleynik, M. Ulanov, D. Svinkin and T. Cline on behalf of the Konus-Wind
team,
K. Yamaoka, M. Ohno, Y. Fukazawa, T. Takahashi, M. Tashiro, Y. Terada,
T. Murakami, K. Makishima, and Y. Hanabata on behalf of the Suzaku-WAM
team,
V. Connaughton, M.S. Briggs and C.A. Meegan on behalf of the Fermi
GBM team,
and K. Hurley
report:
The long GRB 100414A, seen by Fermi/LAT (Takahashi et al., GCN 10594)
Fermi/GBM (Foley, GCN 10595), and Konus-Wind (Golenetskii et al., GCN
10597) was also detected by Suzaku WAM so far.
Triangulation gives a Konus-WAM annulus centered at RA(2000)=3D223.490
(14h 53m 58s) Dec(2000)=3D-18.645 (-18d 38' 42"), whose
radius is 41.329 =B1 0.588 deg (3 sigma);
and a Konus-GBM annulus centered at RA(2000)=3D223.527 (14h 54m 06s)
Dec(2000)=3D-18.436 (-18d 26' 09"), whose radius is 41.123 =B1 0.262 deg
(3 sigma). These annuli are parallel and cannot be used to
define a small error box. The Konus-GBM annulus is entirely contained
within the the Konus-WAM annulus in the region around the Fermi/LAT
localization.
The center of the LAT position (RA,Dec,Err =3D 191.59, 8.57, 0.18 deg)
is 0.377 deg from the center line of the annulus.
A figure of the triangulated localization can be seen at:
http://gammaray.nsstc.nasa.gov/gbm/science/ipn_plots/GRB100414A_IPN.png
This localization may be refined with the arrival of data from more
distant spacecraft.
Swift is following up this localization using information from the IPN
triangulation and further processing from the Fermi LAT team.
- GCN Circular #10601
K.L. Page (U. Leicester), J. L. Racusin (NASA/GSFC), J.A. Kennea (PSU) and
J.K. Cannizzo (NASA/UMBC) report on behalf of the Swift-XRT team:
Following a Target of Opportunity request, Swift started observing the
field of the Fermi GBM- and LAT-detected GRB 100414A about 48 hours after
the trigger (GCN Circs. 10594, 10595). In 1.4 ks of data there is an
uncatalogued source detected within the XRT field of view, at a position
of RA, Dec = 192.11199, 8.69172, which is equivalent to
RA (J2000): 12 48 26.88
Dec (J2000): +08 41 30.2
with an uncertainty of 3.8 arcsec (radius, 90% containment).
The source is at a count rate of 0.022 +/- 0.004 count s^-1 (0.3-10 keV),
corresponding to an observed flux of ~1.31x10^-12 erg cm^-2 s^-1; however,
with the limited data collected so far, it is not possible to determine
whether this source is fading.
- GCN Circular #10603
S. B. Cenko (UC Berkeley), A. Rau (MPE Garching), E. O. Ofek (Caltech),
P. E. Nugent (LBNL), J. Greiner (MPE Garching), and S. R. Kulkarni
(Caltech) report on behalf of a larger collaboration:
We have imaged the Fermi-LAT localization of GRB 100414A (Takahashi et
al., GCN 10594; Foley, GCN 10595) with the automated Palomar 48 inch
Schmidt telescope as part of the Palomar Transient Factory (PTF; Law et
al, PASP, 1395; Rau et al, PASP 121, 1334) survey. A 60 s R-band image
was obtained beginning at 7:53 UT on 15 April 2010 (~ 29.5 hours after the
burst trigger), followed approximately an hour later by another 60 s image
of the identical field.
Digital subtraction with respect to a stacked pre-explosion P48 reference
image reveals no afterglow candidate to a limiting magnitude of R > 21.0
mag within the 90% LAT localization region (Takahashi et al., GCN 10594).
We note, however, that our imaging does not cover the location of the
potential XRT afterglow candidate identified by Page et al. (GCN 10601).
- GCN Circular #10605
K.L. Page, P.A. Evans and M.R. Goad (U. Leicester) report on behalf of the
Swift-XRT team:
Using 3686 s of XRT Photon Counting mode data and 3 UVOT images, we find
an astrometrically corrected X-ray position (using the XRT-UVOT alignment
and matching UVOT field sources to the USNO-B1 catalogue): RA, Dec =
192.11266, 8.69309 which is equivalent to:
RA (J2000): 12 48 27.04
Dec (J2000): +08 41 35.1
with an uncertainty of 2.0 arcsec (radius, 90% confidence).
This position may be improved as more data are received. Position
enhancement is described by Goad et al. (2007, A&A, 476, 1401) and Evans
et al. (2009, MNRAS, 397, 1177).
Please note that we still cannot confirm that this source is fading.
This circular is an official product of the Swift-XRT team.
- GCN Circular #10606
A. Cucchiara and D. B. Fox (PSU) report on behalf of
a larger collaboration:
"Starting on 2010 April 17.26 UT we used the GMOS spectrograph
on the Gemini North 8-m telescope to observe the field of the
Fermi-LAT GRB 100414A (Takahashi et al. GCN 10594).
In our 5 min i'-band observation we detected a bright source
inside the refined XRT error circle (Page et al., GCN 10605)
at the following coordinate:
RA: 12:48:29.96
Dec: +8:41:34.91
with 0.5" uncertainty in both directions.
Using two USNO-B1 stars we obtain i' = 20.37 +- 0.03 mag for this
object.
A sequence of 2x1200s spectra were also obtained with the same
instrument, covering a spectral range of 4000-8000A.
A series of metal absorption features were identified (FeII2374,
FeII2383,FeII2587,MnII2594, FeII2600, MgII2796,2803,MgI2853) at
the common redshift of z= 1.368.
We therefore suggest this as the redshift of GRB 100414A.
Further observations are planned.
We thank the Gemini staff for performing this observation,
in particular A. Fritz."
- GCN Circular #10607
Robert Filgas, Thomas Kruehler and Jochen Greiner (all MPE Garching)
report on behalf of the GROND team:
We observed the field of GRB 100414A (Fermi GBM/LAT trigger
292904423/100414.097; Takahashi et al., GCN #10594, Foley, GCN #10595)
simultaneously in g'r'i'z'JHK with GROND (Greiner et al. 2008, PASP 120,
405) mounted at the 2.2 m MPI/ESO telescope at La Silla Observatory (Chile).
Observations started at 03:11 UT on April 17, 73 hours after the GRB
trigger, and were performed through thick cloud coverage.
We detect the optical afterglow reported by Cucchiara & Fox (GCN #10606)
in the optical bands. To reiterate the position, we measure
RA (J2000.0) = 12 h 48 m 26.93 s
DEC (J2000.0) = +08d 41' 34.4"
with an uncertainty of 0.5" in each coordinate against SDSS astrometry
and inside the enhanced XRT error circle reported by Page et al. (GCN
#10605).
Based on 4 min of total exposure, we estimate preliminary magnitudes
(all in AB system) of
g' = 21.3 +- 0.1 mag,
r' = 20.9 +- 0.1 mag
Given magnitudes are calibrated against SDSS field stars and are not
corrected for the expected Galactic foreground extinction corresponding
to a reddening of E_(B-V)=0.03 mag in the direction of the burst
(Schlegel et al. 1998).
- GCN Circular #10608
A. Cucchiara (PSU) reports on behalf of a larger collaboration:
"We noted a typo in the coordinate reported in GCN 10606.
The correct position of the GRB 100414A optical transient
in our Gemini-N image is:
RA: 12:48:26.96
Dec: +08:41:34.91
We thank W. Landsman for pointing this out to us and we
apologize for any confusion this may have caused."
- GCN Circular #10609
W. Landsman (GSFC) and J. Cannizzo (GSFC) report on behalf of the
Swift/UVOT team:
The Swift/UVOT began observations of the field of GRB 100414A 40.4 hours
after the Fermi LAT and GBM-detected trigger (Takahashi et al. GCN Circ.
10594, Foley et al., GCN Circ. 10595). We detect the source reported
by Cucchiara & Fox (GCN Circ. 10606, 10608) and Filgas et al. (GCN Circ.
10607) Combining our white observations into exposures beginning at
40.4 and 53.2 hours, we find evidence for source fading.
Filter T_start (hr) Exp(s) Mag Err
White 40.38 765 20.54 +/- 0.10
White 53.20 3531 20.86 +/- 0.06
These observations are not corrected for the expected Galactic
foreground extinction corresponding to a reddening of E_(B-V)=0.03 mag
in the direction of the burst (Schlegel et al. 1998). The photometry
is on the UVOT photometric system described in Poole et al.(2008, MNRAS,
383,627).
- GCN Circular #10610
T. Uehara, Y. Hanabata, T. Takahashi, Y. Fukazawa (Hiroshima U.),
K. Yamaoka (Aoyama Gakuin U.), S. Sugita (Nagoya U),
Y. Terada, M. Tashiro, S. Hong, A. Endo, K. Onda, T. Sugasahara, W. Iwakiri
(Saitama U.), M. Ohno, M. Kokubun, T. Takahashi (ISAS/JAXA),
Y. E. Nakagawa, M. Suzuki, 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, P. Tsai
(NCU), T. Enoto, K. Nakazawa, K. Makishima (Univ. of Tokyo),
on behalf of the Suzaku WAM team, report:
The bright long, Fermi-LAT GRB 100414A (Takahashi et al., GCN 10594;
Fermi/GBM trigger #292904423 / 100414097; Foley, GCN 10595) triggered the
Suzaku Wide-band All-sky Monitor (WAM) which covers an energy range
of 50 keV - 5 MeV at 02:20:22.879 UT (=T0).
The observed light curve shows a multi-peaked structure starting at T0-1.5 s,
ending at T0+24.5 s with a duration (T90) of about 22 seconds.
The fluence in 100 - 1000 keV was 4.88(-0.36, +0.13)x10-5 erg/cm^2.
The 1-s peak flux measured from T0+22.5 s was 6.13(-0.79, +0.40)
photons/cm^2/s in the same energy range.
Preliminary result shows that the time-averaged spectrum from
T0-1.5 s to T0+24.5 s is well fitted by a GRB Band model as follows.
the low-energy photon index alpha: -0.56(-0.29, +0.37),
the high-energy photon index beta: -3.05(-0.53, +0.30),
and the peak energy Epeak: 612(-53, +55) keV (chi^2/d.o.f = 34/23).
Due to the brightness of this burst, a 3% systematic error was
added for low energy channels. In addition, there might be
some calibration uncertainties in these spectral parameters
because GRB photons came to the WAM detector by passing through the
large Ne dewar of the X-ray micro-calorimeter (XRS).
All the errors are quoted at 90% confidence level.
The light curves for this burst are available at:
http://www.astro.isas.jaxa.jp/suzaku/HXD-WAM/WAM-GRB/grb/trig/grb_table.html
- GCN Circular #10618
A. Moskvitin, T. Fatkhullin, V. Sokolov (SAO RAS Niznijh Arkhyz, Russia),
on behalf of a larger colaboration, report:
We observed an OT (Cucchiara & Fox, GCN Circ. 10606, 10608;
Filgas, Kruehler & Greiner, GCN Circ. 10607; Landsman & Cannizzo,
GCN Circ. 10609) of GRB 100414A with the Zeiss-1000 telescope
of SAO RAS, Russia. Observations started 87.31 hours after
the Fermi LAT and GBM triggers (Takahashi et al., GCN Circ. 10594;
Foley, GCN Circ. 10595). We obtained 12 x 300 sec images both in Rc
and V bands with the airmass 1.2-1.7 under good weather conditions.
Calibration was carried out with 8 SDSS nearby stars, whose magnitudes
were transformed according to formulae from
http://www.sdss.org/dr5/algorithms/sdssUBVRITransform.html (Lupon 2005).
Rc = 21.40 +/- 0.09 (17:39:01 -- 19:05:27 UT, mean epoch = April, 17.765),
V = 21.75 +/- 0.08 (19:08:49 -- 20:31:05 UT, mean epoch = April, 17.826).
These magnitudes are not corrected for the expected Galactic extinction
reported in Landsman & Cannizzo, GCN Circ. 10609.
This message may be cited.
- GCN Circular #10632
K.L. Page (U. Leicester) and J.K. Cannizzo (NASA/UMBC) report on behalf of the
Swift-XRT team:
A second Swift-XRT observation of the Fermi-detected GRB 100414A (GCN
Circs 10594 and 10595) was performed on 2001-04-19, 5.7 days after the
trigger. The source reported by Page et al. (GCN Circs 10601, 10605) is no
longer detected, with a 3-sigma upper limit on the count rate of 4.5x10^-3
count s^-1 (corresponding to an observed flux of 2.5x10^-13 erg cm^-2
s^-1). This non-detection sets a lower limit on the decay slope of alpha >
1.5.
With this fading, we can confirm that this source is the X-ray afterglow of GRB
100414A.
This circular is an official product of the Swift-XRT team.
- GCN Circular #10641
Y. Urata (NCU) and K.Y Huang (ASIAA) on behalf of EAFON report;
"We observed the location of the GRB100414A optical afterglow
(Cucchiara et al. 10608) with CFHT on the night of April 19 (5.2 day
after the trigger) and 20 (6.2 day). The g', r' and i' band images
show the afterglow clearly. We estimate preliminary magnitudes of
r'=22.46+/-0.05 (5.19 day) and r'=22.84+/-0.05 (6.17 day) against the
SDSS field stars. Combined with the photometric results reported by
Filgas et al (10607) and Cucchiara (10606), the optical afterglow
light curves are well described by a simple power law decay with the
temporal index about 2.5."
- GCN Circular #10649
Poonam Chandra (RMC), Dale A. Frail (NRAO), S. Bradley Cenko (Berkeley)
and Fiona Harrison (Caltech) report on behalf of a larger collaboration:
We used the Expanded Very Large Array (EVLA) to observe the
Fermi burst GRB 100414A (Takahashi et al, GCN 10594 Foley GCN 10595)
on 2010 Apr 19 UT Within the revised XRT error circle (Goad et al
GCN 10605).
We detect the GRB afterglow with a flux density of 406 +/- 22 uJy.
The EVLA is undergoing active commissioning and as such these results
should be considered preliminary=2E Further observations are planned.
The National Radio Astronomy Observatory is a facility of the National
Science Foundation operated under cooperative agreement by Associated
Universities Inc.
- GCN Circular #10697
A.P. Kamble (U of Amsterdam), A.J. van der Horst (NASA/MSFC/ORAU),
R.A.M.J. Wijers, E. Rol (U of Amsterdam), C. Kouveliotou (NASA/MSFC)
and K. Wiersema (U of Leicester) report on behalf of a larger
collaboration :
"We observed the field of Fermi GBM/LAT burst GRB 100414A (GCN 10594,
10595, 10649) using the Westerbork Synthesis Radio Telescope at 4.8 GHz
from April 27, 16.0 UT to April 28, 04.0 UT, i.e. 13.57 to 14.1 days
after the burst. We detect the radio afterglow with flux density
of 420 +/- 38 microJy at the position of the optical afterglow
detected by GROND (GCN 10607).
We would like to thank the WSRT staff for rapidly scheduling and
obtaining these observations."
- GCN Circular #10698
Dale A. Frail (NRAO), Poonam Chandra (RMC), S. Bradley Cenko
(Berkeley) and Fiona Harrison (Caltech) report on behalf of a larger
collaboration:
"We used the Expanded Very Large Array (EVLA) to observe the field of
view towards the Fermi GBM/LAT burst GRB 100414A (GCN 10594, 10595,
10649) on April 27.18 UT at a center frequency of 8.46 GHz. We detect
the radio afterglow with flux density of 397 +- 15 microJy at the
position of the optical afterglow detected by GROND (GCN 10607).
Further observations are planned.
The EVLA is still undergoing active commissioning and we caution that
these results should be considered preliminary. The National Radio
Astronomy Observatory is a facility of the National Science Foundation
operated under cooperative agreement by Associated Universities, Inc."
- 1202.6440 from 1 Mar 12
Yuji Urata et al.: Energetic Fermi/LAT GRB100414A: Energetic and Correlations
This study presents multi-wavelength observational results for energetic GRB100414A with GeV photons. The prompt spectral fitting using
Suzaku/WAM data yielded spectral peak energies of E^src_peak of 1458.7 (+132.6, -106.6) keV and Eiso of 34.5(+2.0, -1.8) x 10^52 erg with
z=1.368. The optical afterglow light curves between 3 and 7 days were effectively fitted according to a simple power law with a temporal index
of alpha=-2.6 +/- 0.1. The joint light curve with earlier Swift/UVOT observations yields a temporal break at 2.3 +/- 0.2 days. This was the
first \fermi/LAT detected event that demonstrated the clear temporal break in the optical afterglow. The jet opening angle derived from this
temporal break was 5.8 degree, consistent with those of other well-observed long gamma-ray bursts (GRBs). The multi-wavelength analyses in this
study showed that GRB100414A follows E^src_peak-Eiso and E^src_peak-E_gamma correlations. The late afterglow revealed a flatter evolution with
significant excesses at 27.2 days. The most straightforward explanation for the excess is that GRB100414A was accompanied by a contemporaneous
supernova. The model light curve based on other GRB-SN events is marginally consistent with that of the observed lightcurve.
Previous IAU Circulars 
