- GCN NOTICE
TITLE: GCN/FERMI NOTICE
NOTICE_DATE: Wed 13 Sep 23 07:56:30 UT
NOTICE_TYPE: Fermi-GBM Flight Position
RECORD_NUM: 58
TRIGGER_NUM: 716284577
GRB_RA: 258.633d {+17h 14m 32s} (J2000),
258.660d {+17h 14m 38s} (current),
258.578d {+17h 14m 19s} (1950)
GRB_DEC: +64.983d {+64d 58' 60"} (J2000),
+64.957d {+64d 57' 26"} (current),
+65.038d {+65d 02' 18"} (1950)
GRB_ERROR: 10.28 [deg radius, statistical plus systematic]
GRB_INTEN: 105 [cnts/sec]
DATA_SIGNIF: 11.70 [sigma]
INTEG_TIME: 4.096 [sec]
GRB_DATE: 20200 TJD; 256 DOY; 23/09/13
GRB_TIME: 28572.16 SOD {07:56:12.16} UT
GRB_PHI: 264.00 [deg]
GRB_THETA: 25.00 [deg]
DATA_TIME_SCALE: 4.0960 [sec]
HARD_RATIO: 0.50
LOC_ALGORITHM: 3 (version number of)
MOST_LIKELY: 89% GRB
2nd_MOST_LIKELY: 5% Cyg X-1
DETECTORS: 0,0,0, 1,0,0, 0,1,0, 0,0,0, 0,0,
SUN_POSTN: 171.07d {+11h 24m 17s} +3.85d {+03d 50' 52"}
SUN_DIST: 85.49 [deg] Sun_angle= -5.8 [hr] (East of Sun)
MOON_POSTN: 154.96d {+10h 19m 51s} +14.92d {+14d 55' 03"}
MOON_DIST: 82.16 [deg]
MOON_ILLUM: 3 [%]
GAL_COORDS: 95.00, 34.59 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS: 193.44, 85.08 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL: http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230913331/quicklook/glg_lc_medres34_bn230913331.gif
COMMENTS: Fermi-GBM Flight-calculated Coordinates.
COMMENTS: This trigger occurred at longitude,latitude = 165.37,-16.18 [deg].
COMMENTS: The LC_URL file will not be created until ~15 min after the trigger.
- GCN NOTICE
TITLE: GCN/FERMI NOTICE
NOTICE_DATE: Wed 13 Sep 23 07:56:17 UT
NOTICE_TYPE: Fermi-GBM Flight Position
RECORD_NUM: 44
TRIGGER_NUM: 716284577
GRB_RA: 22.867d {+01h 31m 28s} (J2000),
23.558d {+01h 34m 14s} (current),
21.463d {+01h 25m 51s} (1950)
GRB_DEC: +82.300d {+82d 17' 60"} (J2000),
+82.421d {+82d 25' 17"} (current),
+82.042d {+82d 02' 32"} (1950)
GRB_ERROR: 20.90 [deg radius, statistical plus systematic]
GRB_INTEN: 67 [cnts/sec]
DATA_SIGNIF: 5.60 [sigma]
INTEG_TIME: 2.048 [sec]
GRB_DATE: 20200 TJD; 256 DOY; 23/09/13
GRB_TIME: 28572.16 SOD {07:56:12.16} UT
GRB_PHI: 260.98 [deg]
GRB_THETA: 55.00 [deg]
DATA_TIME_SCALE: 2.0480 [sec]
HARD_RATIO: 0.94
LOC_ALGORITHM: 3 (version number of)
MOST_LIKELY: 95% GRB
2nd_MOST_LIKELY: 1% Generic Transient
DETECTORS: 0,0,0, 1,0,0, 0,1,0, 0,0,0, 0,0,
SUN_POSTN: 171.07d {+11h 24m 17s} +3.85d {+03d 50' 52"}
SUN_DIST: 92.55 [deg] Sun_angle= 9.8 [hr] (West of Sun)
MOON_POSTN: 154.96d {+10h 19m 51s} +14.92d {+14d 55' 05"}
MOON_DIST: 80.16 [deg]
MOON_ILLUM: 3 [%]
GAL_COORDS: 124.35, 19.54 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS: 74.39, 62.69 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL: http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230913331/quicklook/glg_lc_medres34_bn230913331.gif
COMMENTS: Fermi-GBM Flight-calculated Coordinates.
COMMENTS: This trigger occurred at longitude,latitude = 165.37,-16.18 [deg].
COMMENTS: The LC_URL file will not be created until ~15 min after the trigger.
- GCN NOTICE
TITLE: GCN/FERMI NOTICE
NOTICE_DATE: Wed 13 Sep 23 07:56:39 UT
NOTICE_TYPE: Fermi-GBM Ground Position
RECORD_NUM: 57
TRIGGER_NUM: 716284577
GRB_RA: 282.130d {+18h 48m 31s} (J2000),
281.724d {+18h 46m 54s} (current),
282.976d {+18h 51m 54s} (1950)
GRB_DEC: +79.670d {+79d 40' 12"} (J2000),
+79.697d {+79d 41' 50"} (current),
+79.609d {+79d 36' 34"} (1950)
GRB_ERROR: 5.23 [deg radius, statistical only]
DATA_SIGNIF: 11.70 [sigma]
DATA_INTERVAL: 4.096 [sec]
GRB_DATE: 20200 TJD; 256 DOY; 23/09/13
GRB_TIME: 28572.16 SOD {07:56:12.16} UT
GRB_PHI: 261.00 [deg]
GRB_THETA: 41.00 [deg]
E_RANGE: 44.032 - 279.965 [keV]
LOC_ALGORITHM: 4173 (Gnd S/W Version number)
SUN_POSTN: 171.07d {+11h 24m 17s} +3.85d {+03d 50' 52"}
SUN_DIST: 89.82 [deg] Sun_angle= -7.4 [hr] (East of Sun)
MOON_POSTN: 154.96d {+10h 19m 51s} +14.92d {+14d 55' 01"}
MOON_DIST: 81.38 [deg]
MOON_ILLUM: 3 [%]
GAL_COORDS: 111.35, 26.78 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS: 80.72, 76.49 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL: http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230913331/quicklook/glg_lc_medres34_bn230913331.gif
POS_MAP_URL: http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_716284577.fits
COMMENTS: Fermi-GBM Ground-calculated Coordinates.
COMMENTS: In the LAT Field-of-view.
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.
COMMENTS:
COMMENTS: NOTE: This GBM event is temporally(1.0<100sec) coincident with the CALET_GBM event (trignum=1378626813).
- GCN NOTICE
TITLE: GCN/FERMI NOTICE
NOTICE_DATE: Wed 13 Sep 23 08:05:22 UT
NOTICE_TYPE: Fermi-GBM Final Position
RECORD_NUM: 0
TRIGGER_NUM: 716284577
GRB_RA: 287.630d {+19h 10m 31s} (J2000),
287.292d {+19h 09m 10s} (current),
288.331d {+19h 13m 20s} (1950)
GRB_DEC: +78.880d {+78d 52' 48"} (J2000),
+78.920d {+78d 55' 11"} (current),
+78.794d {+78d 47' 39"} (1950)
GRB_ERROR: 6.49 [deg radius, statistical only]
GRB_DATE: 20200 TJD; 256 DOY; 23/09/13
GRB_TIME: 28572.16 SOD {07:56:12.16} UT
GRB_PHI: 259.00 [deg]
GRB_THETA: 41.00 [deg]
E_RANGE: 44.032 - 279.965 [keV]
LOC_ALGORITHM: 41731 (Gnd S/W Version number)
SUN_POSTN: 171.08d {+11h 24m 19s} +3.85d {+03d 50' 43"}
SUN_DIST: 91.08 [deg] Sun_angle= -7.7 [hr] (East of Sun)
MOON_POSTN: 155.03d {+10h 20m 08s} +14.89d {+14d 53' 15"}
MOON_DIST: 82.69 [deg]
MOON_ILLUM: 3 [%]
GAL_COORDS: 110.62, 25.67 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS: 75.24, 76.75 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL: http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230913331/quicklook/glg_lc_medres34_bn230913331.gif
LOC_URL: http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230913331/quicklook/glg_locplot_all_bn230913331.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.
COMMENTS:
COMMENTS: NOTE: This GBM event is temporally(1.0<100sec) coincident with the CALET_GBM event (trignum=1378626813).
- GCN Circular #34680
The Fermi GBM team reports the detection of a likely LONG GRB
At 07:56:12 UT on 13 Sep 2023, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 230913A (trigger 716284577.16364 / 230913331).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 287.6, Dec = 78.9 (J2000 degrees, equivalent to J2000 19h 10m, 78d 54'), with a statistical uncertainty of 6.5 degrees.
The angle from the Fermi LAT boresight is 41.0 degrees.
The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230913331/quicklook/glg_skymap_all_bn230913331.png
The HEALPix FITS file, including the estimated localization systematic, can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230913331/quicklook/glg_healpix_all_bn230913331.fit
The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230913331/quicklook/glg_lc_medres34_bn230913331.gif
- GCN Circular #34682
V. Lipunov, V.Kornilov, E. Gorbovskoy, K. Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, V.Senik, D. Vlasenko,
G.Antipov, D.Zimnukhov, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D. Cheryasov, Ya.Kechin, Yu.Tselik, A. Sosnovskij
(Lomonosov Moscow State University, SAI, Physics Department),
R. Podesta, C.Lopez, F. Podesta, C.Francile
(Observatorio Astronomico Felix Aguilar OAFA),
R. Rebolo, M. Serra
(The Instituto de Astrofisica de Canarias),
D. Buckley
(South African Astronomical Observatory),
O.A. Gress, N.M. Budnev, O.Ershova
(Irkutsk State University, API),
L.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez,
A.R.Corella, L.H.Rodriguez
(INAOE, Guillermo Haro Astrophysics Observatory),
A. Tlatov, D. Dormidontov
(Kislovodsk Solar Station of the Pulkovo Observatory),
V. Yurkov, A. Gabovich
(Blagoveschensk Educational State University)
MASTER-Amur robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Blagoveshchensk State Pedagogical University) started inspect of the Fermi GRB 230913A ( Fermi GBM team, GCN 34680) errorbox 12289 sec after notice time and 12299 sec after trigger time at 2023-09-13 11:21:12 UT, with upper limit up to 18.5 mag. Observations started at twilight. The observations began at zenith distance = 27 deg. The sun altitude is -14.7 deg.
The galactic latitude b = 26 deg., longitude l = 111 deg.
Real time updated cover map and OT discovered available here:
https://master.sai.msu.ru/site/master2/observ.php?id=2269810
We obtain a following upper limits.
Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment
_________|_____________________|_____________________|____________________________________|_____|_______|_______|________
12330 | 2023-09-13 11:21:12 | MASTER-Amur | (19h 14m 13.35s , +77d 14m 05.4s) | C | 60 | 18.5 |
12411 | 2023-09-13 11:22:33 | MASTER-Amur | (19h 32m 21.13s , +76d 57m 30.6s) | C | 60 | 18.4 |
Filter C is a clear (unfiltred) band.
The observation and reduction will continue.
The message may be cited.
- GCN Circular #34683
Samuele Ronchini (PSU), Jamie A. Kennea (PSU), James DeLaunay (U Alabama), Aaron Tohuvavohu (U Toronto), Gayathri Raman (PSU), Tyler Parsotan (NASA GSFC) report:
Swift/BAT did not localize GRB 230913A onboard (T0: 2023-09-13T07:56:12.16 UTC, Fermi/GBM GCN 34680, CALET trigger 1378626813).
The Fermi and CALET notices, 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), detects the burst in a 8.192 s analysis time bin with a sqrt(TS) of 19.7.
An arcminute localization is found with DeltaLLHOut of 64.99 and a DeltaLLHPeak of 60.07.
See Section 9.1 and Figures 10 and 17 in the NITRATES paper for brief descriptions and interpretations of sqrt(TS), DeltaLLHPeak, and DeltaLLHOut.
The BAT position is
RA, Dec = 267.349, +74.484 deg (J2000) which is
RA (J2000) 17h 49m 23.8s
Dec (J2000) 74d 29m 2.4s
with an estimated uncertainty of 5 arcmin radius.
No XRT and UVOT follow-up can be done due to observational constraints.
We strongly encourage follow-up from other telescopes.
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/
View this GCN Circular online at https://gcn.nasa.gov/circulars/34683.
- GCN Circular #34689
S. Dalessi (UAH), R. Hamburg (CNRS/IJCLab), and C. Meegan (UAH) report on behalf of
the Fermi Gamma-ray Burst Monitor Team:
"At 07:56:12.16 UT on 13 September 2023, the Fermi Gamma-ray Burst Monitor (GBM)
triggered and located GRB 230913A (trigger 716284577/230913331).
which was also detected by Swift/BAT GUANO (S. Ronchini et al. 2023, GCN 34683).
The Fermi GBM Final Real-time Localization was reported in GCN 34680.
The angle from the Fermi LAT boresight is 41 degrees.
The GBM light curve single peak with a duration (T90)
of about 12 s (50-300 keV). The time-averaged spectrum
from T0-1.0 to T0+9.2 s is best fit by
a power law function with an exponential high-energy cutoff.
The power law index is -0.1 +/- 0.2 and the cutoff energy,
parameterized as Epeak, is 160 +/- 10 keV.
The event fluence (10-1000 keV) in this time interval is
(3.1 +/- 0.3)E-06 erg/cm^2. The 1-sec peak photon flux measured
starting from T0+1.3 s in the 10-1000 keV band is 2.1 +/- 0.2 ph/s/cm^2.
A Band function fits the spectrum equally well
with Epeak= 130 +/- 20 keV, alpha = 0.3 +/- 0.4 and beta = -2.3 +/- 0.2.
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/"
View this GCN Circular online at https://gcn.nasa.gov/circulars/34689.
- GCN Circular #34696
M. Kerr, C.C. Cheung, J. E. Grove, R. Woolf (NRL), A. Goldstein (USRA), C.A=
. Wilson-Hodge (MSFC), and M.S. Briggs (UAH) report:
The Glowbug gamma-ray telescope [1,2], operating on the International Space=
Station, reports the detection of GRB 230913A, which was also detected by =
Fermi/GBM, CALET, and Swift/BAT-GUANO (GCN 34680, 34683)
=20
Using an adaptive window with a resolution of 32-ms, the burst onset is det=
ermined to be 2023-09-13 07:56:06.008 with a duration of 12.3 s and a total=
significance of about 22.2 sigma.
=20
Using a standard power-law function with an exponential high-energy cutoff =
[3] to model the emission over this duration results in a photon index dN/d=
E~E^x of x=3D2.0 and a cutoff energy ("Epeak") of 152 keV. The modeled 10-=
10000 keV fluence is 7.7e-07 erg/cm^2.
=20
The analysis results presented here are preliminary and use a response func=
tion that lacks a detailed characterization of the surrounding passive stru=
cture of the ISS.
=20
Glowbug is a NASA-funded technology demonstrator for sensitive, low-cost ga=
mma-ray transient telescopes developed, built, and operated by the U.S. Nav=
al Research Laboratory (NRL) with support from the University of Alabama in=
Huntsville, USRA, and NASA MSFC. It was launched on 2023 March 15 aboard =
the Department of Defense Space Test Program=E2=80=99s STP-H9 to the ISS. =
The detector comprises 12 large-area (15 cm x 15 cm) CsI:Tl panels covering=
the surface of a half cube, and two hexagonal (5-cm diameter, 10-cm length=
) CLLB scintillators, giving it a large field of view (instantaneous FoV ~2=
/3 sky) over a wide energy band of 50 keV to >2 MeV.
[1] Grove, J.E. et al. 2020, Proc. Yamada Conf. LXXI, arXiv:2009.11959
[2] Woolf, R.S. et al. 2022, Proc. SPIE, 12181, id. 121811O
[3] Goldstein, A. et al. 2020, ApJ 895, 40, arXiv :1909.03006
Distribution Statement A: Approved for public release. Distribution is unlimited.
- GCN Circular #34700
M. L. Cherry (LSU), A. Yoshida, T. Sakamoto, S. Sugita (AGU),
Y. Kawakubo (LSU), K. Yamaoka (Nagoya U), S. Nakahira (JAXA),
Y. Asaoka (ICRR), S. Torii, Y. Akaike, K. Kobayashi (Waseda U),
Y. Shimizu, T. Tamura (Kanagawa U), N. Cannady (GSFC/UMBC),
S. Ricciarini (U of Florence),
P. S. Marrocchesi (U of Siena),
and the CALET collaboration:
The long GRB 230913A (Fermi GBM Final Real-time Localization:
Fermi GBM team, GCN Circ. 34680; Swift/BAT-GUANO arcminute
localization, Ronchini et al., GCN Circ. 34683; Fermi GBM Observation:
Dalessi et al., GCN Circ. 34689; Glowbug gamma-ray detection: Kerr et al.,
GCN Circ. 34696) triggered the CALET Gamma-ray Burst Monitor (CGBM)
at 07:56:11.95 UTC on 13 September 2023
(http://cgbm.calet.jp/cgbm_trigger/flight/1378626813/index.html).
The burst signal was seen by all CGBM detectors.
The burst light curve shows a single pulse that starts
at T+0.9 sec, peaks at T+1.5 sec, and ends at T+4.4 sec.
The T90 and T50 durations measured by the SGM data are 3.1 +/- 0.3 sec
and 1.9 +/- 0.4 sec (40-1000 keV), respectively.
The ground-processed light curve is available at
http://cgbm.calet.jp/cgbm_trigger/ground/1378626813/
The CALET data used in this analysis are provided by
the Waseda CALET Operation Center located at Waseda University.
View this GCN Circular online at https://gcn.nasa.gov/circulars/34700.