- GCN NOTICE
TITLE: GCN/FERMI NOTICE
NOTICE_DATE: Fri 24 Jun 22 02:59:04 UT
NOTICE_TYPE: Fermi-GBM Flight Position
RECORD_NUM: 45
TRIGGER_NUM: 677732320
GRB_RA: 182.683d {+12h 10m 44s} (J2000),
182.968d {+12h 11m 52s} (current),
182.049d {+12h 08m 12s} (1950)
GRB_DEC: +27.283d {+27d 16' 60"} (J2000),
+27.158d {+27d 09' 30"} (current),
+27.561d {+27d 33' 41"} (1950)
GRB_ERROR: 5.43 [deg radius, statistical plus systematic]
GRB_INTEN: 615 [cnts/sec]
DATA_SIGNIF: 26.30 [sigma]
INTEG_TIME: 1.024 [sec]
GRB_DATE: 19754 TJD; 175 DOY; 22/06/24
GRB_TIME: 10715.16 SOD {02:58:35.16} UT
GRB_PHI: 78.00 [deg]
GRB_THETA: 75.00 [deg]
DATA_TIME_SCALE: 1.0240 [sec]
HARD_RATIO: 0.57
LOC_ALGORITHM: 3 (version number of)
MOST_LIKELY: 87% GRB
2nd_MOST_LIKELY: 8% Distant Particles
DETECTORS: 1,1,0, 0,0,0, 0,0,0, 1,1,0, 0,0,
SUN_POSTN: 92.85d {+06h 11m 24s} +23.41d {+23d 24' 36"}
SUN_DIST: 79.65 [deg] Sun_angle= -6.0 [hr] (East of Sun)
MOON_POSTN: 35.78d {+02h 23m 08s} +12.83d {+12d 49' 35"}
MOON_DIST: 128.89 [deg]
MOON_ILLUM: 21 [%]
GAL_COORDS: 209.62, 80.95 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS: 170.78, 25.92 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL: http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2022/bn220624124/quicklook/glg_lc_medres34_bn220624124.gif
COMMENTS: Fermi-GBM Flight-calculated Coordinates.
COMMENTS: This trigger occurred at longitude,latitude = 303.28,17.52 [deg].
COMMENTS: The LC_URL file will not be created until ~15 min after the trigger.
COMMENTS:
COMMENTS: NOTE: This GBM event is temporally(3.0<100sec) coincident with the CALET_GBM event (trignum=1340074490).
- GCN NOTICE
TITLE: GCN/FERMI NOTICE
NOTICE_DATE: Fri 24 Jun 22 02:59:14 UT
NOTICE_TYPE: Fermi-GBM Flight Position
RECORD_NUM: 58
TRIGGER_NUM: 677732320
GRB_RA: 182.817d {+12h 11m 16s} (J2000),
183.101d {+12h 12m 24s} (current),
182.183d {+12h 08m 44s} (1950)
GRB_DEC: +27.517d {+27d 31' 00"} (J2000),
+27.392d {+27d 23' 30"} (current),
+27.795d {+27d 47' 41"} (1950)
GRB_ERROR: 3.72 [deg radius, statistical plus systematic]
GRB_INTEN: 2262 [cnts/sec]
DATA_SIGNIF: 191.70 [sigma]
INTEG_TIME: 4.096 [sec]
GRB_DATE: 19754 TJD; 175 DOY; 22/06/24
GRB_TIME: 10715.16 SOD {02:58:35.16} UT
GRB_PHI: 78.00 [deg]
GRB_THETA: 75.00 [deg]
DATA_TIME_SCALE: 4.0960 [sec]
HARD_RATIO: 0.45
LOC_ALGORITHM: 3 (version number of)
MOST_LIKELY: 93% GRB
2nd_MOST_LIKELY: 4% Generic Transient
DETECTORS: 1,1,0, 0,0,0, 0,0,0, 1,1,0, 0,0,
SUN_POSTN: 92.85d {+06h 11m 24s} +23.41d {+23d 24' 36"}
SUN_DIST: 79.68 [deg] Sun_angle= -6.0 [hr] (East of Sun)
MOON_POSTN: 35.79d {+02h 23m 09s} +12.83d {+12d 49' 38"}
MOON_DIST: 128.79 [deg]
MOON_ILLUM: 21 [%]
GAL_COORDS: 208.14, 81.07 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS: 170.78, 26.18 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL: http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2022/bn220624124/quicklook/glg_lc_medres34_bn220624124.gif
COMMENTS: Fermi-GBM Flight-calculated Coordinates.
COMMENTS: This trigger occurred at longitude,latitude = 303.28,17.52 [deg].
COMMENTS: The LC_URL file will not be created until ~15 min after the trigger.
COMMENTS:
COMMENTS: NOTE: This GBM event is temporally(3.0<100sec) coincident with the CALET_GBM event (trignum=1340074490).
- GCN NOTICE
TITLE: GCN/FERMI NOTICE
NOTICE_DATE: Fri 24 Jun 22 02:59:23 UT
NOTICE_TYPE: Fermi-GBM Ground Position
RECORD_NUM: 57
TRIGGER_NUM: 677732320
GRB_RA: 179.340d {+11h 57m 22s} (J2000),
179.628d {+11h 58m 31s} (current),
178.698d {+11h 54m 47s} (1950)
GRB_DEC: +21.150d {+21d 08' 60"} (J2000),
+21.025d {+21d 01' 30"} (current),
+21.428d {+21d 25' 42"} (1950)
GRB_ERROR: 1.61 [deg radius, statistical only]
DATA_SIGNIF: 129.50 [sigma]
DATA_INTERVAL: 2.048 [sec]
GRB_DATE: 19754 TJD; 175 DOY; 22/06/24
GRB_TIME: 10715.16 SOD {02:58:35.16} UT
GRB_PHI: 78.00 [deg]
GRB_THETA: 82.00 [deg]
E_RANGE: 44.032 - 279.965 [keV]
LOC_ALGORITHM: 4173 (Gnd S/W Version number)
SUN_POSTN: 92.85d {+06h 11m 24s} +23.41d {+23d 24' 35"}
SUN_DIST: 79.01 [deg] Sun_angle= -5.8 [hr] (East of Sun)
MOON_POSTN: 35.79d {+02h 23m 09s} +12.83d {+12d 49' 39"}
MOON_DIST: 130.93 [deg]
MOON_ILLUM: 21 [%]
GAL_COORDS: 235.89, 76.30 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS: 170.66, 19.07 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL: http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2022/bn220624124/quicklook/glg_lc_medres34_bn220624124.gif
POS_MAP_URL: http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_677732320.fits
COMMENTS: Fermi-GBM Ground-calculated Coordinates.
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.
COMMENTS:
COMMENTS: NOTE: This GBM event is temporally(3.0<100sec) coincident with the CALET_GBM event (trignum=1340074490).
- GCN NOTICE
TITLE: GCN/FERMI NOTICE
NOTICE_DATE: Fri 24 Jun 22 03:07:52 UT
NOTICE_TYPE: Fermi-GBM Final Position
RECORD_NUM: 0
TRIGGER_NUM: 677732320
GRB_RA: 178.960d {+11h 55m 50s} (J2000),
179.249d {+11h 57m 00s} (current),
178.317d {+11h 53m 16s} (1950)
GRB_DEC: +20.430d {+20d 25' 48"} (J2000),
+20.305d {+20d 18' 18"} (current),
+20.708d {+20d 42' 30"} (1950)
GRB_ERROR: 1.00 [deg radius, statistical only]
GRB_DATE: 19754 TJD; 175 DOY; 22/06/24
GRB_TIME: 10715.16 SOD {02:58:35.16} UT
GRB_PHI: 78.00 [deg]
GRB_THETA: 83.00 [deg]
E_RANGE: 44.032 - 279.965 [keV]
LOC_ALGORITHM: 41731 (Gnd S/W Version number)
SUN_POSTN: 92.86d {+06h 11m 25s} +23.41d {+23d 24' 35"}
SUN_DIST: 78.93 [deg] Sun_angle= -5.8 [hr] (East of Sun)
MOON_POSTN: 35.85d {+02h 23m 25s} +12.86d {+12d 51' 25"}
MOON_DIST: 131.05 [deg]
MOON_ILLUM: 21 [%]
GAL_COORDS: 237.76, 75.64 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS: 170.64, 18.27 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL: http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2022/bn220624124/quicklook/glg_lc_medres34_bn220624124.gif
LOC_URL: http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2022/bn220624124/quicklook/glg_locplot_all_bn220624124.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: Bright hard burst in the GBM.
COMMENTS: This is likely a Long GRB.
COMMENTS:
COMMENTS: NOTE: This GBM event is temporally(3.0<100sec) coincident with the CALET_GBM event (trignum=1340074490).
- GCN Circular #32256
The Fermi GBM team reports the detection of a likely LONG GRB
At 02:58:35 UT on 24 Jun 2022, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 220624A (trigger 677732320.15865 / 220624124).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 179.0, Dec = 20.4 (J2000 degrees, equivalent to J2000 11h 56m, 20d 23'), with a statistical uncertainty of 1.0 degrees.
The angle from the Fermi LAT boresight is 83.0 degrees.
The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2022/bn220624124/quicklook/glg_skymap_all_bn220624124.png
The HEALPix FITS file, including the estimated localization systematic, can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2022/bn220624124/quicklook/glg_healpix_all_bn220624124.fit
The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2022/bn220624124/quicklook/glg_lc_medres34_bn220624124.gif
- GCN Circular #32259
A. Ursi, L. Foffano (INAF/IAPS), M. Tavani (INAF/IAPS, and Univ. Roma Tor
Vergata), A. Argan, M. Cardillo, C. Casentini, Y. Evangelista, E. Menegoni,
G. Piano (INAF/IAPS), A. Bulgarelli, A. Di Piano, V. Fioretti, N.
Parmiggiani (INAF/OAS-Bologna), F. Lucarelli, C. Pittori, F. Verrecchia
(SSDC, and INAF/OAR), M. Romani (INAF/OA-Brera), M. Marisaldi
(INAF/OAS-Bologna, and Bergen University), M. Pilia, A. Trois
(INAF/OA-Cagliari), I. Donnarumma (ASI), A. Giuliani (INAF/IASF-Mi), F.
Longo (Univ. Trieste and INFN Trieste), and P. Tempesta (TeleSpazio),
report on behalf of the AGILE Team:
The AGILE satellite detected the long GRB 220624A at T0 = 2022-06-24
02:58:35 s (UTC), reported by Fermi GBM (GCN #32256). The burst is clearly
visible in the AGILE scientific ratemeters of the SuperAGILE (SA; 20-60
keV), MiniCALorimeter (MCAL; 0.4-100 MeV), and AntiCoincidence (AC; 50-200
keV) detectors. The event lasted about 57 s and it released a total number
of 5930 counts in the SA detector (above a background rate of 70 Hz), 88920
counts in the MCAL detector (above a background rate of 1135 Hz), and
212145 counts in the AC detector (above a background rate of 3195 Hz). The
AGILE ratemeters light curves can be found at
http://www.agilescienceapp.it/notices/GRB220624A_AGILE_RM.png .
The event also triggered a partial high time resolution MCAL data
acquisition, from T1 = 2022-06-24 02:58:34.36 s (UTC) to T2 = 2022-06-24
02:58:46.85 s (UTC), and released 14630 counts in the detector, above a
background rate of 620 Hz. The MCAL light curve can be found at
http://www.agilescienceapp.it/notices/GRB220624A_078864_583124315.000000.png
. At the T0, the event was 20 deg off-axis.
Additional analysis of AGILE data is in progress. Automatic MCAL GRB alert
Notices can be found at: https://gcn.gsfc.nasa.gov/agile_mcal.html.
- GCN Circular #32261
F. Verrecchia, A. Ursi (INAF/IAPS), A. Giuliani (INAF/IASF-Mi), L. Foffano
(INAF/IAPS), M. Tavani (INAF/IAPS, and Univ. Roma Tor Vergata), F. Longo
(Univ. Trieste and INFN Trieste), F. Lucarelli, C. Pittori (SSDC, and
INAF/OAR), G. Piano, A. Argan, M. Cardillo, Y. Evangelista, E. Menegoni
(INAF/IAPS), A. Bulgarelli, A. Di Piano, V. Fioretti, N. Parmiggiani
(INAF/OAS), M. Marisaldi (INAF/OAS, and Bergen University), M. Pilia,
A. Trois (INAF/OA-Cagliari), I. Donnarumma (ASI), report on behalf of
the AGILE Team:
The Gamma-Ray Imaging Detector (GRID) of AGILE detected a gamma-ray
transient
temporally coincident with the long GRB 220624A reported by Fermi/GBM in
GCN #32256 and also detected by AGILE/MCAL (Ursi et al., GCN #32259).
A preliminary GRID analysis shows a detection with a statistical
significance
above 8 sigma over a time integration of 20 s starting from the T0 of GRB
220624A, at a sky position compatible with that of the GRB.
We obtained 25 events 2 of which are notably above 1 GeV.
The GRB position was about 30 deg off-axis from the GRID boresight.
These measurements were obtained with AGILE observing a large portion of
the sky in spinning mode. Additional analysis of AGILE data is in progress.
- GCN Circular #32263
Aaron Tohuvavohu (U Toronto), Gayathri Raman (PSU), James DeLaunay
(UAlabama), Jamie A. Kennea (PSU), report:
Swift/BAT did not localize GRB 220624A onboard (T0:
2022-06-24T02:58:35 UTC, Fermi/GBM GCN 32256, CALET trig # 1340074490,
AGILE GCN 32259,32261).
The Fermi/GBM 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,
arXiv:2111.01769), detects the burst with a sqrt(TS) of 75 in a 16.384
s analysis time bin.
The burst episode as seen by BAT is ~50 s long.
NITRATES results indicate a burst coming from outside of the coded
FoV, with DeltaLLHOut of -427. The NITRATES maximum likelihood sky
position is consistent with the Fermi/GBM localization region.
See Section 9.1 and Figure 20 in the NITRATES paper for brief
descriptions and interpretation of sqrt(TS), DeltaLLHPeak, and
DeltaLLHOut.
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 #32265
A.S. Kozyrev, D.V. Golovin, M.L. Litvak, I.G. Mitrofanov, and A.B. Sanin
on behalf of the MGNS/BepiColombo and HEND/Mars Odyssey teams,
J. Benkhoff on behalf of the BepiColombo team,
A. Ridnaia, D. Frederiks, D. Svinkin, A. Lysenko,
and T. Cline on behalf of the Konus-Wind team,
A. Goldstein, M. S. Briggs, and C. Wilson-Hodge
on behalf of the Fermi GBM 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 GRB 220624A
(Fermi/GBM detection: Fermi GBM Team, GCN 32256;
AGILE detection: Ursi et al., GCN 32259;
AGILE/GRID detection: Verrecchia et al., GCN 32261;
Swift/BAT-GUANO detection: Tohuvavohu et al., GCN 32263)
has been detected by Fermi (GBM trigger 677732320),
Konus-Wind, Mars-Odyssey (HEND), BepiColombo (MGNS),
CALET (CGBM), AGILE (SA, MCAL, AC), and Swift (BAT),
so far, at about 10715 s UT (02:58:35).
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:
179.348 (11h 57m 24s) +16.691 (+16d 41' 27")
Corners:
179.501 (11h 58m 00s) +16.922 (+16d 55' 18")
179.357 (11h 57m 26s) +16.791 (+16d 47' 29")
179.194 (11h 56m 47s) +16.456 (+16d 27' 20")
179.339 (11h 57m 21s) +16.590 (+16d 35' 25")
---------------------------------------------
The error box area is 91 sq. arcmin, and its maximum
dimension is 33 arcmin (the minimum one is 4 arcmin).
The Sun distance was 80 deg.
This box may be improved.
The IPN localization is consistent with, but reduces the area of, the
Fermi-GBM final localization (GCN 32256).
A triangulation map and HEALPix FITS file are posted at
http://www.ioffe.ru/LEA/GRBs/GRB220624_T10712/IPN
The Konus-Wind time history and spectrum will be given in a forthcoming
GCN Circular.
- GCN Circular #32267
V. Lipunov, V.Kornilov, E.Gorbovskoy, K.Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, D. Vlasenko,
G.Antipov, D.Zimnukhov, V.Senik, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D.Cheryasov, Ya.Kechin
(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. Gres, N.M. Budnev
(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),
A. Gabovich, V.Yurkov
(Blagoveschensk Educational State University)
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 220624A ( Fermi GBM team, GCN 32256) errorbox 73147 sec after notice time and 73182 sec after trigger time at 2022-06-24 23:18:17 UT, with upper limit up to 16.8 mag. The observations began at zenith distance = 53 deg. The sun altitude is -20.2 deg.
The galactic latitude b = 76 deg., longitude l = 240 deg.
Real time updated cover map and OT discovered available here:
https://master.sai.msu.ru/site/master2/observ.php?id=2014237
We obtain a following upper limits.
Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment
_________|_____________________|_____________________|____________________________________|_____|_______|_______|________
73212 | 2022-06-24 23:18:17 | MASTER-OAFA | (11h 46m 48.60s , +19d 37m 00.6s) | C | 60 | 16.8 |
73488 | 2022-06-24 23:22:52 | MASTER-OAFA | (11h 55m 57.05s , +21d 32m 42.9s) | C | 60 | 16.0 |
73599 | 2022-06-24 23:24:44 | MASTER-OAFA | (12h 04m 29.08s , +21d 31m 52.7s) | C | 60 | 15.5 |
73710 | 2022-06-24 23:26:35 | MASTER-OAFA | (11h 54m 38.45s , +17d 43m 50.5s) | C | 60 | 16.4 |
74306 | 2022-06-24 23:36:31 | MASTER-OAFA | (11h 46m 41.60s , +19d 37m 49.0s) | C | 60 | 16.0 |
74397 | 2022-06-24 23:38:02 | MASTER-OAFA | (11h 55m 14.99s , +19d 38m 51.1s) | C | 60 | 15.5 |
74671 | 2022-06-24 23:42:35 | MASTER-OAFA | (11h 54m 39.68s , +17d 43m 02.0s) | C | 60 | 16.2 |
75428 | 2022-06-24 23:55:13 | MASTER-OAFA | (11h 46m 48.65s , +19d 36m 57.2s) | C | 60 | 12.3 |
75520 | 2022-06-24 23:56:44 | MASTER-OAFA | (11h 55m 16.98s , +19d 38m 15.4s) | C | 60 | 14.0 |
75611 | 2022-06-24 23:58:16 | MASTER-OAFA | (11h 55m 54.10s , +21d 31m 13.9s) | C | 60 | 13.8 |
75702 | 2022-06-24 23:59:47 | MASTER-OAFA | (12h 04m 34.80s , +21d 32m 30.2s) | C | 60 | 12.3 |
Filter C is a clear (unfiltred) band.
The observation and reduction will continue.
The message may be cited.
- GCN Circular #32269
S. Lesage (UAH) and C. Meegan (UAH) report on behalf of the Fermi Gamma-ray
Burst Monitor Team:
"At 02:58:35 UT on 24 June 2022, the Fermi Gamma-ray Burst Monitor (GBM)
triggered and located GRB 220624A (trigger 677732320/220624124)
which was also detected by AGILE (A. Ursi, et al. 2022, GCN 32259),
Swift/BAT-GUANO (A. Tohuvavohu et al., GCN 32263),
and localized by IPN (A. S. Kozyrev et al. 2022, GCN 32265).
The Fermi GBM Final Real-time Localization (GCN 32256) is consistent with
the IPN triangulation.
The angle from the Fermi LAT boresight is 86 degrees.
The GBM light curve shows two bright emission episodes
and one faint emission episode with a duration (T90)
of about 285 s (10-1000 keV).
The time-averaged spectrum for the first emission episode
from T0-0.5 to T0+59.9 s is best fit by
a Band function with Epeak = 486 +/- 12 keV,
alpha = -0.75 +/- 0.01, and beta = -2.39 +/- 0.06.
The event fluence (10-1000 keV) in this time interval is
(1.550 +/- 0.001)E-04 erg/cm^2.
The time-averaged spectrum for the second emission episode
from T0+137.7 to T0+172.5 s is best fit by
a power law function with an exponential high-energy cutoff.
The power law index is -1.23 +/- 0.06 and the cutoff energy,
parameterized as Epeak, is 132 +/- 8 keV.
The event fluence (10-1000 keV) in this time interval is
(1.19 +/- 0.04)E-05 erg/cm^2.
A Band function fits the spectrum equally well
with Epeak= 124 +/- 11 keV, alpha = -1.19 +/- 0.07 and beta = -2.8 +/- 0.5.
The time-averaged spectrum for the third emission episode
from T0+285.2 to T0+333.3 s is best fit by
a Band function with Epeak = 61 +/- 10 keV,
alpha = 1.3 +/- 1.0, and beta = -2.0 +/- 0.1.
The event fluence (10-1000 keV) in this time interval is
(7.3 +/- 0.5)E-06 erg/cm^2.
The 1-sec peak photon flux measured starting from T0+6.0 s
in the 10-1000 keV band is 39.1 +/- 0.5 ph/s/cm^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/"
- GCN Circular #32272
Y. Akaike (Waseda U), A. Yoshida, T. Sakamoto, S. Sugita (AGU),
Y. Kawakubo (LSU), K. Yamaoka (Nagoya U), S. Nakahira (RIKEN),
Y. Asaoka (ICRR), S. Torii, K. Kobayashi (Waseda U),
Y. Shimizu, T. Tamura (Kanagawa U), N. Cannady (GSFC/UMBC),
M. L. Cherry (LSU), S. Ricciarini (U of Florence),
P. S. Marrocchesi (U of Siena),
and the CALET collaboration:
The long GRB 220624A (Fermi GBM Final Real-time Localization: Fermi GBM team,
GCN Circ. 32256; AGILE detection: Ursi et al., GCN Circ. 32259; AGILE/GRID analysis:
Verrecchia et al., GCN Circ: 32261; Swift/BAT-GUANO detection: Tohuvavohu et al.,
GCN Circ. 32263; IPN triangulation: Kozyrev et al., GCN Circ. 32265; Fermi-GBM
Detection: Lesage et al., GCN Circ. 32269) triggered the CALET Gamma-ray Burst
Monitor (CGBM) at 02:58:32.538 UTC on 24 June 2022
(http://cgbm.calet.jp/cgbm_trigger/flight/1340074490/index.html).
The burst signal was seen by all CGBM detectors.
The burst light curve shows a multi-peaked structure which starts at T+2.5 sec.
The whole episode was not seen by CGBM because the sequence of the HV
turn-off started from T+20 sec.
The ground processed light curve is available at
http://cgbm.calet.jp/cgbm_trigger/ground/1340074490/
The CALET data used in this analysis are provided by
the Waseda CALET Operation Center located at the Waseda University.
- GCN Circular #32286
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 GRB 220624A (Fermi-GBM detection: Fermi GBM Team, GCN 32256; Lesage & Meegan, GCN Circ 32269;
AGILE detection: Ursi et al., GCN Circ 32259;
Swift/BAT-GUANO detection outside the coded FOV: Tohuvavohu et al., GCN Circ 32263;
IPN triangulation: Kozyrev et al., GCN 32265;
CALET-CGBM detection: Akaike et al., GCN Circ 32272)
triggered Konus-Wind (KW) at T0=10712.946 s UT (02:58:32.946).
The burst light curve shows three major emission episodes.
The first episode lasts from ~T0-3 s to ~T0+54 s,
the second - from ~T0-135 s to ~T0+168 s,
and the third - from ~T0-291 s to ~T0+365 s.
The total duration of the burst is ~370 s.
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/GRB220624_T10712/
As observed by Konus-Wind, the burst had
a fluence of (3.15 ± 0.49)x10^-4 erg/cm^2 and
a 64-ms peak energy flux, measured from T0 + 5.760 s,
of (2.22 ± 0.15)x10^-5 erg/cm^2/s (both in the 20 keV - 10 MeV energy range).
The time-integrated spectrum (measured from T0 to T0+340.224 s)
is best fit in the 20 keV - 15 MeV range
by a GRB (Band) function with the following model parameters:
the low-energy photon index alpha = -0.89 (-0.14,+0.17),
the high energy photon index beta = -2.11 (-0.28,+0.17),
the peak energy Ep = 379 (-71,+86) keV,
chi2 = 65/97 dof.
The spectrum near the peak count rate (measured from T0 to T0+14.336 s)
is best fit in the 20 keV - 15 MeV range
by a GRB (Band) function with the following model parameters:
the low-energy photon index alpha = -0.51 (-0.06,+0.06),
the high energy photon index beta = -2.17 (-0.06,+0.06),
the peak energy Ep = 439 (-25,+27) keV,
chi2 = 89/97 dof.
All the quoted errors are estimated at the 90% confidence level.
All the presented results are preliminary.
- GCN Circular #32303
F. Verrecchia (SSDC, and INAF/OAR), A. Ursi (INAF/IAPS), A. Giuliani
(INAF/IASF-Mi), M. Tavani (INAF/IAPS, and Univ. Roma Tor Vergata),
F. Longo (Univ. Trieste and INFN Trieste), L. Foffano (INAF/IAPS),
F. Lucarelli, C. Pittori (SSDC, and INAF/OAR), M. Romani
(INAF/OA-Brera), G. Piano, A. Argan, M. Cardillo, C. Casentini,
Y. Evangelista, E. Menegoni (INAF/IAPS), A. Bulgarelli, A. Di Piano,
V. Fioretti, N. Parmiggiani (INAF/OAS), M. Marisaldi (INAF/OAS,
and Bergen University), M. Pilia, A. Trois (INAF/OA-Cagliari),
I. Donnarumma (ASI), and P. Tempesta (TeleSpazio), report on
behalf of the AGILE Team:
he Gamma-Ray Imaging Detector (GRID) of AGILE detected gamma-ray
transient emission consistent with the long GRB 220624A reported
by Fermi/GBM (GCN #32256) at T0 = 2022-06-24 02:58:35 s (UTC),
as already reported in Verrecchia et al. GCN #32261 and also
detected by AGILE/MCAL (Ursi et al., GCN #32259).
An improved localization has been reported by the IPN (Kozyrev
et al. GCN #32265).
A refined AGILE/GRID data analysis in the energy range 30 MeV - 10
GeV shows a detection with a statistical significance of about 10
sigma over a time integration of 20 s starting at the T0 of GRB
220624A, at a sky position with Galactic coordinates l=260 deg,
b=75 deg, with and an error radius of 4 deg (90% statistical +
systematic error; R.A.= 182 deg, Decl.= 16 deg (J2000)).
The GRID error circle includes the IPN position.
During the 20s integration, we detected a total of 41 events (3
background events estimated through a Li&Ma analysis), 17 events at
energies above 100 MeV, and 3 events above 1 GeV.
These measurements were obtained with AGILE observing a large
portion of the sky in spinning mode. Additional analysis of AGILE
data is in progress.
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