- GCN NOTICE
TITLE: GCN/FERMI NOTICE
NOTICE_DATE: Sun 17 Nov 24 03:01:12 UT
NOTICE_TYPE: Fermi-GBM Flight Position
RECORD_NUM: 48
TRIGGER_NUM: 753505248
GRB_RA: 11.467d {+00h 45m 52s} (J2000),
11.814d {+00h 47m 15s} (current),
10.771d {+00h 43m 05s} (1950)
GRB_DEC: +45.750d {+45d 45' 00"} (J2000),
+45.886d {+45d 53' 08"} (current),
+45.477d {+45d 28' 37"} (1950)
GRB_ERROR: 4.73 [deg radius, statistical plus systematic]
GRB_INTEN: 665 [cnts/sec]
DATA_SIGNIF: 51.90 [sigma]
INTEG_TIME: 2.048 [sec]
GRB_DATE: 20631 TJD; 322 DOY; 24/11/17
GRB_TIME: 10843.23 SOD {03:00:43.23} UT
GRB_PHI: 100.00 [deg]
GRB_THETA: 30.00 [deg]
DATA_TIME_SCALE: 2.0480 [sec]
HARD_RATIO: 0.26
LOC_ALGORITHM: 3 (version number of)
MOST_LIKELY: 97% GRB
2nd_MOST_LIKELY: 1% Generic Transient
DETECTORS: 1,0,0, 0,0,0, 0,0,0, 0,1,0, 0,0,
SUN_POSTN: 232.91d {+15h 31m 39s} -19.07d {-19d 04' 29"}
SUN_DIST: 136.92 [deg] Sun_angle= -9.3 [hr] (East of Sun)
MOON_POSTN: 69.90d {+04h 39m 36s} +26.87d {+26d 52' 16"}
MOON_DIST: 49.25 [deg]
MOON_ILLUM: 98 [%]
GAL_COORDS: 121.92,-17.11 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS: 31.08, 37.01 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL: http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn241117125/quicklook/glg_lc_medres34_bn241117125.gif
COMMENTS: Fermi-GBM Flight-calculated Coordinates.
COMMENTS: This trigger occurred at longitude,latitude = 282.92,14.23 [deg].
COMMENTS: The LC_URL file will not be created until ~15 min after the trigger.
- GCN NOTICE
TITLE: GCN/FERMI NOTICE
NOTICE_DATE: Sun 17 Nov 24 03:01:30 UT
NOTICE_TYPE: Fermi-GBM Ground Position
RECORD_NUM: 59
TRIGGER_NUM: 753505248
GRB_RA: 4.400d {+00h 17m 36s} (J2000),
4.722d {+00h 18m 53s} (current),
3.753d {+00h 15m 01s} (1950)
GRB_DEC: +18.510d {+18d 30' 36"} (J2000),
+18.648d {+18d 38' 53"} (current),
+18.232d {+18d 13' 56"} (1950)
GRB_ERROR: 2.08 [deg radius, statistical only]
DATA_SIGNIF: 54.10 [sigma]
DATA_INTERVAL: 2.048 [sec]
GRB_DATE: 20631 TJD; 322 DOY; 24/11/17
GRB_TIME: 10843.23 SOD {03:00:43.23} UT
GRB_PHI: 119.00 [deg]
GRB_THETA: 55.00 [deg]
E_RANGE: 44.032 - 279.965 [keV]
LOC_ALGORITHM: 4173 (Gnd S/W Version number)
SUN_POSTN: 232.91d {+15h 31m 39s} -19.07d {-19d 04' 29"}
SUN_DIST: 134.55 [deg] Sun_angle= -8.8 [hr] (East of Sun)
MOON_POSTN: 69.90d {+04h 39m 37s} +26.87d {+26d 52' 18"}
MOON_DIST: 60.05 [deg]
MOON_ILLUM: 98 [%]
GAL_COORDS: 111.82,-43.63 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS: 11.54, 15.21 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL: http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn241117125/quicklook/glg_lc_medres34_bn241117125.gif
POS_MAP_URL: http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_753505248.fits
COMMENTS: Fermi-GBM Ground-calculated Coordinates.
COMMENTS: In the LAT Field-of-view.
COMMENTS: Bright hard burst in the GBM.
COMMENTS: This Notice was ground-generated -- not flight-generated.
COMMENTS: The LC_URL file will not be created/available until ~15 min after the trigger.
COMMENTS: The POS_MAP_URL file will not be created/available until ~1.5 min after the notice.
- GCN NOTICE
TITLE: GCN/FERMI NOTICE
NOTICE_DATE: Sun 17 Nov 24 03:02:41 UT
NOTICE_TYPE: Fermi-GBM Ground Position
RECORD_NUM: 1
TRIGGER_NUM: 753505248
GRB_RA: 2.770d {+00h 11m 05s} (J2000),
3.091d {+00h 12m 22s} (current),
2.126d {+00h 08m 30s} (1950)
GRB_DEC: +16.040d {+16d 02' 24"} (J2000),
+16.178d {+16d 10' 42"} (current),
+15.762d {+15d 45' 43"} (1950)
GRB_ERROR: 1.51 [deg radius, statistical only]
DATA_SIGNIF: 40.90 [sigma]
DATA_INTERVAL: 8.192 [sec]
GRB_DATE: 20631 TJD; 322 DOY; 24/11/17
GRB_TIME: 10843.23 SOD {03:00:43.23} UT
GRB_PHI: 119.00 [deg]
GRB_THETA: 58.00 [deg]
E_RANGE: 44.032 - 279.965 [keV]
LOC_ALGORITHM: 41731 (Gnd S/W Version number)
SUN_POSTN: 232.91d {+15h 31m 39s} -19.08d {-19d 04' 30"}
SUN_DIST: 132.58 [deg] Sun_angle= -8.7 [hr] (East of Sun)
MOON_POSTN: 69.92d {+04h 39m 40s} +26.87d {+26d 52' 25"}
MOON_DIST: 62.41 [deg]
MOON_ILLUM: 98 [%]
GAL_COORDS: 108.97,-45.74 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS: 9.03, 13.59 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL: http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn241117125/quicklook/glg_lc_medres34_bn241117125.gif
POS_MAP_URL: http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_753505248.fits
COMMENTS: Fermi-GBM Ground-calculated Coordinates.
COMMENTS: In the LAT Field-of-view.
COMMENTS: This is likely a Long GRB.
COMMENTS: This Notice was ground-generated -- not flight-generated.
COMMENTS: The LC_URL file will not be created/available until ~15 min after the trigger.
COMMENTS: The POS_MAP_URL file will not be created/available until ~1.5 min after the notice.
- GCN NOTICE
TITLE: GCN/FERMI NOTICE
NOTICE_DATE: Sun 17 Nov 24 03:10:01 UT
NOTICE_TYPE: Fermi-GBM Final Position
RECORD_NUM: 0
TRIGGER_NUM: 753505248
GRB_RA: 2.040d {+00h 08m 10s} (J2000),
2.360d {+00h 09m 26s} (current),
1.397d {+00h 05m 35s} (1950)
GRB_DEC: +16.330d {+16d 19' 48"} (J2000),
+16.468d {+16d 28' 06"} (current),
+16.052d {+16d 03' 06"} (1950)
GRB_ERROR: 1.74 [deg radius, statistical only]
GRB_DATE: 20631 TJD; 322 DOY; 24/11/17
GRB_TIME: 10843.23 SOD {03:00:43.23} UT
GRB_PHI: 118.00 [deg]
GRB_THETA: 58.00 [deg]
E_RANGE: 44.032 - 279.965 [keV]
LOC_ALGORITHM: 41731 (Gnd S/W Version number)
SUN_POSTN: 232.92d {+15h 31m 41s} -19.08d {-19d 04' 34"}
SUN_DIST: 131.95 [deg] Sun_angle= -8.6 [hr] (East of Sun)
MOON_POSTN: 70.00d {+04h 40m 00s} +26.89d {+26d 53' 11"}
MOON_DIST: 63.02 [deg]
MOON_ILLUM: 98 [%]
GAL_COORDS: 108.10,-45.29 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS: 8.49, 14.15 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL: http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn241117125/quicklook/glg_lc_medres34_bn241117125.gif
LOC_URL: http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn241117125/quicklook/glg_locplot_all_bn241117125.png
COMMENTS: Fermi-GBM Final Position.
COMMENTS: This Notice was ground-generated -- not flight-generated.
COMMENTS: The LC_URL file should be available by the time this FINAL notice is produced.
COMMENTS: This notice was generated completely by automated pipeline processing.
COMMENTS: In the LAT Field-of-view.
COMMENTS: This is likely a Long GRB.
- GCN Circular #38258
The Fermi GBM team reports the detection of a likely LONG GRB
At 03:00:43 UT on 17 Nov 2024, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 241117A (trigger 753505248.23077 / 241117125).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 2.0, Dec = 16.3 (J2000 degrees, equivalent to J2000 00h 08m, 16d 18'), with a statistical uncertainty of 1.7 degrees.
The angle from the Fermi LAT boresight is 58.0 degrees.
The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn241117125/quicklook/glg_skymap_all_bn241117125.png
The HEALPix FITS file, including the estimated localization systematic, can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn241117125/quicklook/glg_healpix_all_bn241117125.fit
The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn241117125/quicklook/glg_lc_medres34_bn241117125.gif
- GCN Circular #38259
V.Lipunov, E.Gorbovskoy, N.Tiurina, P.Balanutsa, , D.Vlasenko, I.Panchenko,
A.Kuznetsov, G.Antipov, A.Sankovich, A.Sosnovskij, Yu.Tselik, M.Gulyaev, Ya.Kechin,
V.Senik, A.Chasovnikov, K.Labsina, I. Gorbunov (Lomonosov MSU),
O.Gress, N.Budnev (ISU),
C.Francile, F. Podesta, R.Podesta, E. Gonzalez (Observatorio Astronomico Felix Aguilar (OAFA),
A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory),
A. Gabovich, V.Yurkov (Blagoveschensk Educational StateUniversity)
D.Buckley (SAAO),
R.Rebolo (The Instituto de Astrofisica de Canarias),
L.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez,
A.R.Corella, L.H.Rodriguez (INAOE, Guillermo Haro Astrophysics Observatory)
MASTER-OAFA robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Argentina (OAFA observatory of San Juan National University) started inspect of the Fermi GRB 241117A ( Fermi GBM team, GCN 38258) errorbox 113 sec after notice time and 156 sec after trigger time at 2024-11-17 03:03:20 UT, with upper limit up to 19.5 mag. The observations began at zenith distance = 55 deg. The sun altitude is -36.8 deg.
The galactic latitude b = -45 deg., longitude l = 109 deg.
Real time updated cover map and OT discovered available here:
https://master.sai.msu.ru/site/master2/observ.php?id=2672996
We obtain a following upper limits.
Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment
_________|_____________________|_____________________|____________________________________|_____|_______|_______|________
162 | 2024-11-17 03:03:20 | MASTER-OAFA | (00h 20m 31.03s , +16d 32m 14.8s) | C | 10 | 16.9 |
187 | 2024-11-17 03:03:20 | MASTER-OAFA | (00h 20m 31.02s , +16d 32m 14.7s) | C | 60 | 18.0 | Coadd
172 | 2024-11-17 03:03:20 | MASTER-OAFA | (00h 11m 05.86s , +16d 08m 16.7s) | C | 30 | 18.6 |
217 | 2024-11-17 03:03:20 | MASTER-OAFA | (00h 11m 05.86s , +16d 08m 16.7s) | C | 120 | 19.5 | Coadd
203 | 2024-11-17 03:03:56 | MASTER-OAFA | (00h 20m 31.02s , +16d 32m 16.3s) | C | 20 | 17.3 |
214 | 2024-11-17 03:03:56 | MASTER-OAFA | (00h 11m 05.84s , +16d 08m 17.6s) | C | 40 | 18.8 |
254 | 2024-11-17 03:04:42 | MASTER-OAFA | (00h 20m 30.98s , +16d 32m 18.3s) | C | 30 | 17.5 |
265 | 2024-11-17 03:04:42 | MASTER-OAFA | (00h 11m 05.80s , +16d 08m 18.4s) | C | 50 | 18.8 |
315 | 2024-11-17 03:05:38 | MASTER-OAFA | (00h 20m 30.94s , +16d 32m 20.4s) | C | 40 | 17.8 |
375 | 2024-11-17 03:05:38 | MASTER-OAFA | (00h 20m 30.94s , +16d 32m 20.4s) | C | 160 | 18.5 | Coadd
326 | 2024-11-17 03:05:38 | MASTER-OAFA | (00h 11m 05.80s , +16d 08m 19.5s) | C | 60 | 18.9 |
386 | 2024-11-17 03:06:44 | MASTER-OAFA | (00h 20m 30.93s , +16d 32m 22.4s) | C | 50 | 17.8 |
397 | 2024-11-17 03:06:44 | MASTER-OAFA | (00h 11m 05.76s , +16d 08m 20.9s) | C | 70 | 19.0 |
473 | 2024-11-17 03:08:01 | MASTER-OAFA | (00h 20m 30.89s , +16d 32m 24.5s) | C | 70 | 17.9 |
483 | 2024-11-17 03:08:01 | MASTER-OAFA | (00h 11m 05.72s , +16d 08m 22.0s) | C | 90 | 19.0 |
579 | 2024-11-17 03:09:37 | MASTER-OAFA | (00h 20m 30.85s , +16d 32m 26.6s) | C | 90 | 18.0 |
590 | 2024-11-17 03:09:37 | MASTER-OAFA | (00h 11m 05.68s , +16d 08m 23.7s) | C | 110 | 19.1 |
679 | 2024-11-17 03:11:40 | MASTER-OAFA | (00h 08m 08.45s , +16d 24m 27.9s) | C | 43.3333 | 18.7 |
Filter C is a clear (unfiltred) band.
The observation and reduction will continue.
The message may be cited.
- GCN Circular #38265
L. Scotton (UAH) and C. Meegan (UAH) report on behalf of
the Fermi Gamma-ray Burst Monitor Team:
"At 03:00:43.23 UT on 17 November 2024, the Fermi Gamma-ray Burst Monitor (GBM)
triggered and located GRB 241117A (trigger 753505248/241117125).
The on-ground calculated location, using the Fermi GBM trigger data,
is RA = 2.04, Dec = 16.33 (J2000 degrees, equivalent to
J2000 0h 8m, +16d 19'), with a statistical uncertainty of 1.74 degrees.
(radius, 1-sigma containment, statistical only; there is additionally a
systematic error which we have characterized as a mixture of two Gaussians,
one with a radius of 1.8 degrees (52% contribution) and one with a radius
of 4.1 degrees (47% contribution) [A. Goldstein et al. 2020, ApJ, 895, 1]).
The angle from the Fermi LAT boresight is 58 degrees.
The GBM light curve consists of a single emission episode with a duration (T90)
of about 8.9 s (50-300 keV). The time-averaged spectrum
from T0-0.3 to T0+9.86 s is best fit by
a power law function with an exponential high-energy cutoff.
The power law index is -0.46 +/- 0.07 and the cutoff energy,
parameterized as Epeak, is 724 +/- 62 keV.
The event fluence (10-1000 keV) in this time interval is
(9.7 +/- 0.2)E-06 erg/cm^2. The 1-sec peak photon flux measured
starting from T0+0.58 s in the 10-1000 keV band is 13.2 +/- 0.3 ph/s/cm^2.
A Band function fits the spectrum equally well with
Epeak = 708 +/- 68 keV, alpha = -0.45 +/- 0.07 and beta = -3.16 +/- 0.98.
The spectral analysis results presented above are preliminary;
final results will be published in the GBM GRB Catalog:
https://heasarc.gsfc.nasa.gov/W3Browse/fermi/fermigbrst.html
For Fermi GBM data and info, please visit the official Fermi GBM Support Page:
https://fermi.gsfc.nasa.gov/ssc/data/access/gbm/"
- GCN Circular #38266
SVOM/GRM team: Chen-Wei Wang, Shi-Jie Zheng, Yong-Wei Dong, Jiang-Tao Liu, =
Jian-Chao Sun, Yue Huang, Jiang He, Min Gao, Hao-Xuan Guo, Lu Li, Yong-Ye L=
i, Hong-Wei Liu, Xin Liu, Hao-Li Shi, Li-Ming Song, You-Li Tuo, Wen-Long Zh=
ang, Wen-Jun Tan, Hao-Xi Wang, Jin Wang, Jin-Zhou Wang, Ping Wang, Rui-Jie =
Wang, Yu-Xi Wang, Bo-Bing Wu, Shao-Lin Xiong, Jian-Ying Ye, Yi-Tao Yin, Wen=
-Hui Yu, Fan Zhang, Li Zhang, Peng Zhang, Shuang-Nan Zhang, Yan-Qiu Zhang, =
Yan-Ting Zhang, Shu-Min Zhao, Xiao-Yun Zhao, Chao Zheng (IHEP), Maria-Grazi=
a Bernardini (LUPM/INAF-OAB), Laurent Bouchet (IRAP), David Corre (CEA), Ta=
is Maiolino (LUPM), Fr=C3=A9d=C3=A9ric Piron (LUPM), St=C3=A9phane Schanne =
(CEA), Jingwei Wang (IAP), JeanLuc Att=C3=A9ia (IRAP)
SVOM JSWG: Jian-Yan Wei (NAOC), Bertrand Cordier (CEA), Shuang-Nan Zhang (I=
HEP), St=C3=A9phane Basa (LAM), Arnaud Claret (CEA), Zi-Gao Dai (USTC), Fr=
=C3=A9d=C3=A9ric Daigne (IAP), Jin-Song Deng (NAOC), Olivier Godet (IRAP), =
Andrea Goldwurm (APC), Diego G=C3=B6tz (CEA), Xu-Hui Han (NAOC), Cyril Lac=
haud (APC), En-Wei Liang (GXU), Yu-Lei Qiu (NAOC), Susanna Vergani (Obs.Par=
is), Jing Wang (NAOC), Chao Wu (NAOC), Li-Ping Xin (NAOC), Shao-Lin Xiong =
(IHEP), Bing Zhang (UNLV)
report on behalf of the SVOM team:
During the commissioning phase, the SVOM/GRM was triggered in-flight by GRB=
241117A (SVOM trigger reference: sb24111701) at 2024-11-17T03:00:43.3 UT (=
T0) , which was also observed by Fermi/GBM (Fermi GBM Team, GCN 38258)
The real-time alert data and light curves of SVOM/GRM were downlinked to th=
e ground through the VHF system with low latency. With the event-by-event d=
ata downloaded through the X-band ground station, the GRM light curve shows=
that the main emission of this burst consists of multiple pulses with a du=
ration of about 3.2 s, which is followed by a long soft extended emission l=
asting longer than 70 s.
The GRM light curve can be found here:
https://www.bursthub.cn//admin/static/svgrb241117A.png
This burst is located at about 72 degrees from the SVOM optical axis, and o=
utside the ECLAIRs field of view.
The Space Variable Objects Monitor (SVOM) is a China-France joint mission l=
ed by the Chinese National Space Administration (CNSA, China), National Cen=
ter for Space Studies (CNES, France) and the Chinese Academy of Sciences (C=
AS, China), which is dedicated to observing gamma-ray bursts and other tran=
sient phenomena in the energetic universe. GRM is developed by the Institut=
e of High Energy Physics (IHEP) of CAS.
The SVOM point of contact for this burst is: Chen-Wei Wang (IHEP)(cwwang@ih=
ep.ac.cn)
- GCN Circular #38273
Samuele Ronchini (PSU), James DeLaunay (PSU), Aaron Tohuvavohu (Caltech), Gayathri Raman (PSU), Jamie A. Kennea (PSU), Tyler Parsotan (NASA GSFC) report:
Swift/BAT did not localize GRB 241117A onboard (T0: 2024-11-17T03:00:43.23 UTC, Fermi GCN 38265, SVOM GCN 38266)
The Fermi notice, distributed in near real-time, triggered the Swift Mission Operations Center operated Gamma-ray Urgent Archiver for Novel Opportunities (GUANO; Tohuvavohu et al. 2020, ApJ, 900, 1).
Upon trigger by this notice, GUANO sent a command to the Swift Burst Alert Telescope (BAT) to save 200 seconds of BAT event-mode data from [-50,+150] seconds around the time of the burst. All the requested event mode data was delivered to the ground.
The BAT likelihood search, NITRATES (DeLaunay + Tohuvavohu 2022, ApJ, 941, 169), performed on the temporal window [T0-20 s, T0+20 s], detects the burst with a sqrt(TS) of 17.36 in a 2.048 s analysis time bin, starting at T0 - 0.5119 s.
Using the NITRATES analysis, parameter estimation was performed to obtain the localization of this burst in the form of a HEALPIX Multi-Order Coverage (MOC) skymap. This localization accounts for both statistical and systematic errors. More details in the creation and calibration of these maps will soon be published (DeLaunay et al. 2024. in prep)
The 90% credible area is 1216 deg2 and the 50% credible area is 257 deg2.
The integrated probability inside the coded field of view is <1%.
The NITRATES skymap is consistent with the Fermi localization reported in the final position notice. The combined Fermi/GBM+NITRATES 90% credible area is 127 deg2 and the 50% credible area is 34 deg2.
A plot of the probability skymap can be viewed here:
[skymap_plot](https://guano.swift.psu.edu/trigger_report?id=753505277/#:~:text=Probability%20Skymap)
The probability skymap file can be downloaded from the link here
[skymap_fits_file](https://guano.swift.psu.edu/files/753505277/0_n_PROBMAP)
Instructions on how to read and manipulate this map can be found here:
https://guano.swift.psu.edu/documentation
More details about this burst can be found on the trigger report page here:
https://guano.swift.psu.edu/trigger_report?id=753505277
GUANO is a fully autonomous, extremely low latency, spacecraft commanding pipeline designed for targeted recovery of BAT event mode data around the times of compelling astrophysical events to enable more sensitive GRB searches.
A live reporting of Swift/BAT event data recovered by GUANO can be found at:
https://www.swift.psu.edu/guano/
- GCN Circular #38300
A.S. Kozyrev, D.V. Golovin, M.L. Litvak, I.G. Mitrofanov, and A.B. Sanin
on behalf of the HEND/Mars Odyssey team,
D. Svinkin, D. Frederiks, A. Lysenko, A. Ridnaia,
and T. Cline on behalf of the Konus-Wind team,
A. Goldstein, M. S. Briggs, C. Wilson-Hodge,
and E. Burns on behalf of the Fermi GBM team,
E. Bozzo and C. Ferrigno, on behalf of the INTEGRAL SPI-ACS GRB team,
S. Barthelmy, J. Cummings, H. Krimm, D. Palmer, and A. Tohuvavohu
on behalf of the Swift-BAT team,
and
W. Boynton, C. Fellows, K. Harshman, H. Enos, R. Starr,
and A.S. Gardner on on behalf of the GRS-Odyssey GRB team,
report:
The long-duration (or possible short GRB with extended emission)
GRB 241117A (Fermi-GBM detection: The Fermi GBM team, GCN 38258;
Scotton and Meegan, GCN 38265;
SVOM-GRM detection: Wang et al., GCN 38266;
Swift-BAT/GUANO detection: Ronchini et al., GCN 38273)
was detected by Fermi (GBM trigger 753505248), Konus-Wind,
SVOM (GRM), INTEGRAL (SPI-ACS), Swift (BAT),
and Mars-Odyssey (HEND), at about 10843 s UT (03:00:43).
The burst was outside the coded field of view of the BAT.
We have triangulated it to a preliminary, 3 sigma error box
whose coordinates are:
---------------------------------------------
RA(2000), deg Dec(2000), deg
---------------------------------------------
Center:
2.489 (00h 09m 57s) +16.049 (+16d 02' 55")
Corners:
2.124 (00h 08m 30s) +16.504 (+16d 30' 14")
1.993 (00h 07m 58s) +16.881 (+16d 52' 52")
2.859 (00h 11m 26s) +15.576 (+15d 34' 33")
3.003 (00h 12m 01s) +15.166 (+15d 09' 59")
---------------------------------------------
The error box area is 557 sq. arcmin, and its maximum
dimension is 1.97 deg (the minimum one is 6 arcmin).
The Sun distance was 130 deg.
This localization may be improved.
A triangulation map and HEALPix FITS file are posted at
http://www.ioffe.ru/LEA/GRBs/GRB241117_T10845/IPN
The HEALPix triangulation map is the multi-order HEALPix in units of
probability density.
The Konus-Wind time history and spectrum will be given
in a forthcoming GCN Circular.
- GCN Circular #38304
V. Panteleeva, D. Frederiks, A. Lysenko, A. Ridnaia,
D. Svinkin, A. Tsvetkova, M. Ulanov, and T. Cline,
on behalf of the Konus-Wind team, report:
The long-duration (or possible short GRB with extended emission;
Fermi-GBM detection: The Fermi GBM Team, GCN 38258;
Scotton and Meegan, GCN 38265;
SVOM-GRM observation: Wang et al., GCN 38266;
Swift-BAT/GUANO detection: Ronchini et al., GCN 38273;
IPN triangulation: Kozyrev et al., GCN 38300)
triggered Konus-Wind at T0=10845.029 s UT (03:00:45.029).
The burst light curve shows the initial short-duration,
bright multipeaked emission episode which starts at ~T0-0.2 s
and has a total duration of ~1.8 s, followed by a weaker
emission traced up to ~77 s.
The emission is seen up to ~5 MeV.
The Konus-Wind light curve of this GRB is available at
http://www.ioffe.ru/LEA/GRBs/GRB241117_T10845/
As observed by Konus-Wind, the burst initial pulse
had a fluence of 1.24(-0.16,+0.34)x10^-5 erg/cm2,
and a 16-ms peak flux, measured from T0+0.132 s,
of 1.72(-0.53,+0.67)x10^-5 erg/cm2/s
(both in the 20 keV - 10 MeV energy range).
The time-averaged spectrum of the initial episode
(measured from T0 to T0+8.448 s)
is best fit in the 20 keV - 16 MeV range
by the GRB (Band) model with the following parameters:
the low-energy photon index alpha = -0.39(-0.27,+0.40),
the high energy photon index beta = -3.54(-6.46,+1.20),
the peak energy Ep = 733(-178,+204) keV
(chi2 = 50/79 dof).
All the quoted errors are at the 90% confidence level.
All the quoted values are preliminary.
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