- GCN NOTICE
TITLE: GCN/FERMI NOTICE
NOTICE_DATE: Sun 02 Apr 23 07:33:05 UT
NOTICE_TYPE: Fermi-GBM Flight Position
RECORD_NUM: 47
TRIGGER_NUM: 702113560
GRB_RA: 91.367d {+06h 05m 28s} (J2000),
91.641d {+06h 06m 34s} (current),
90.776d {+06h 03m 06s} (1950)
GRB_DEC: -10.200d {-10d 11' 59"} (J2000),
-10.203d {-10d 12' 11"} (current),
-10.195d {-10d 11' 40"} (1950)
GRB_ERROR: 5.13 [deg radius, statistical plus systematic]
GRB_INTEN: 811 [cnts/sec]
DATA_SIGNIF: 41.80 [sigma]
INTEG_TIME: 1.024 [sec]
GRB_DATE: 20036 TJD; 92 DOY; 23/04/02
GRB_TIME: 27155.96 SOD {07:32:35.96} UT
GRB_PHI: 240.00 [deg]
GRB_THETA: 20.00 [deg]
DATA_TIME_SCALE: 1.0240 [sec]
HARD_RATIO: 0.39
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: 11.32d {+00h 45m 17s} +4.86d {+04d 51' 50"}
SUN_DIST: 81.38 [deg] Sun_angle= -5.4 [hr] (East of Sun)
MOON_POSTN: 152.16d {+10h 08m 38s} +16.57d {+16d 34' 12"}
MOON_DIST: 65.56 [deg]
MOON_ILLUM: 86 [%]
GAL_COORDS: 216.98,-14.79 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS: 91.62,-33.63 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL: http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230402314/quicklook/glg_lc_medres34_bn230402314.gif
COMMENTS: Fermi-GBM Flight-calculated Coordinates.
COMMENTS: This trigger occurred at longitude,latitude = 127.98,24.85 [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 02 Apr 23 07:33:22 UT
NOTICE_TYPE: Fermi-GBM Ground Position
RECORD_NUM: 58
TRIGGER_NUM: 702113560
GRB_RA: 92.860d {+06h 11m 26s} (J2000),
93.124d {+06h 12m 30s} (current),
92.292d {+06h 09m 10s} (1950)
GRB_DEC: -14.660d {-14d 39' 35"} (J2000),
-14.667d {-14d 40' 00"} (current),
-14.647d {-14d 38' 50"} (1950)
GRB_ERROR: 1.00 [deg radius, statistical only]
DATA_SIGNIF: 49.60 [sigma]
DATA_INTERVAL: 2.048 [sec]
GRB_DATE: 20036 TJD; 92 DOY; 23/04/02
GRB_TIME: 27155.96 SOD {07:32:35.96} UT
GRB_PHI: 227.00 [deg]
GRB_THETA: 18.00 [deg]
E_RANGE: 44.032 - 279.965 [keV]
LOC_ALGORITHM: 4173 (Gnd S/W Version number)
SUN_POSTN: 11.32d {+00h 45m 18s} +4.86d {+04d 51' 51"}
SUN_DIST: 83.34 [deg] Sun_angle= -5.5 [hr] (East of Sun)
MOON_POSTN: 152.16d {+10h 08m 39s} +16.57d {+16d 34' 09"}
MOON_DIST: 66.12 [deg]
MOON_ILLUM: 86 [%]
GAL_COORDS: 221.80,-15.36 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS: 93.52,-38.06 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL: http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230402314/quicklook/glg_lc_medres34_bn230402314.gif
POS_MAP_URL: http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_702113560.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 02 Apr 23 07:41:53 UT
NOTICE_TYPE: Fermi-GBM Final Position
RECORD_NUM: 0
TRIGGER_NUM: 702113560
GRB_RA: 93.110d {+06h 12m 26s} (J2000),
93.374d {+06h 13m 30s} (current),
92.542d {+06h 10m 10s} (1950)
GRB_DEC: -14.590d {-14d 35' 23"} (J2000),
-14.597d {-14d 35' 49"} (current),
-14.576d {-14d 34' 34"} (1950)
GRB_ERROR: 1.00 [deg radius, statistical only]
GRB_DATE: 20036 TJD; 92 DOY; 23/04/02
GRB_TIME: 27155.96 SOD {07:32:35.96} UT
GRB_PHI: 227.00 [deg]
GRB_THETA: 18.00 [deg]
E_RANGE: 44.032 - 279.965 [keV]
LOC_ALGORITHM: 41731 (Gnd S/W Version number)
SUN_POSTN: 11.33d {+00h 45m 19s} +4.87d {+04d 51' 59"}
SUN_DIST: 83.57 [deg] Sun_angle= -5.5 [hr] (East of Sun)
MOON_POSTN: 152.23d {+10h 08m 55s} +16.54d {+16d 32' 30"}
MOON_DIST: 65.92 [deg]
MOON_ILLUM: 86 [%]
GAL_COORDS: 221.84,-15.11 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS: 93.82,-37.99 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL: http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230402314/quicklook/glg_lc_medres34_bn230402314.gif
LOC_URL: http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230402314/quicklook/glg_locplot_all_bn230402314.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: Bright hard burst in the GBM.
COMMENTS: This is likely a Long GRB.
- GCN Circular #33553
The Fermi GBM team reports the detection of a likely LONG GRB
At 07:32:35 UT on 2 Apr 2023, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 230402A (trigger 702113560.95607 / 230402314).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 93.1, Dec = -14.6 (J2000 degrees, equivalent to J2000 06h 12m, -14d 35'), with a statistical uncertainty of 1.0 degrees.
The angle from the Fermi LAT boresight is 18.0 degrees.
The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230402314/quicklook/glg_skymap_all_bn230402314.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/bn230402314/quicklook/glg_healpix_all_bn230402314.fit
The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230402314/quicklook/glg_lc_medres34_bn230402314.gif
- GCN Circular #33554
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-Kislovodsk robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) started inspect of the Fermi GRB 230402A ( Fermi GBM team, GCN 33553) errorbox 32029 sec after notice time and 32063 sec after trigger time at 2023-04-02 16:26:59 UT, with upper limit up to 15.8 mag. Observations started at twilight. The observations began at zenith distance = 61 deg. The sun altitude is -9.7 deg.
The galactic latitude b = -15 deg., longitude l = 222 deg.
Real time updated cover map and OT discovered available here:
https://master.sai.msu.ru/site/master2/observ.php?id=2208192
We obtain a following upper limits.
Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment
_________|_____________________|_____________________|____________________________________|_____|_______|_______|________
32093 | 2023-04-02 16:26:59 | MASTER-Kislovodsk | (06h 16m 40.71s , -13d 55m 08.5s) | C | 60 | 15.1 |
32093 | 2023-04-02 16:26:59 | MASTER-Kislovodsk | (06h 12m 36.97s , -13d 34m 24.3s) | C | 60 | 14.9 |
32173 | 2023-04-02 16:28:19 | MASTER-Kislovodsk | (06h 20m 08.03s , -15d 50m 10.7s) | C | 60 | 15.3 |
32173 | 2023-04-02 16:28:19 | MASTER-Kislovodsk | (06h 16m 01.99s , -15d 29m 26.3s) | C | 60 | 15.1 |
32254 | 2023-04-02 16:29:39 | MASTER-Kislovodsk | (06h 04m 14.25s , -15d 51m 29.2s) | C | 60 | 15.1 |
32334 | 2023-04-02 16:30:59 | MASTER-Kislovodsk | (06h 13m 51.45s , -12d 03m 02.3s) | C | 60 | 15.4 |
32334 | 2023-04-02 16:30:59 | MASTER-Kislovodsk | (06h 09m 48.34s , -11d 42m 21.4s) | C | 60 | 15.3 |
32414 | 2023-04-02 16:32:19 | MASTER-Kislovodsk | (06h 01m 04.95s , -13d 55m 45.9s) | C | 60 | 15.4 |
32815 | 2023-04-02 16:39:00 | MASTER-Kislovodsk | (06h 16m 46.40s , -13d 56m 31.5s) | C | 60 | 15.8 |
32815 | 2023-04-02 16:39:01 | MASTER-Kislovodsk | (06h 12m 42.92s , -13d 35m 50.8s) | C | 60 | 15.7 |
Filter C is a clear (unfiltred) band.
The observation and reduction will continue.
The message may be cited.
- GCN Circular #33555
C. Casentini (INAF/IAPS), C. Pittori (SSDC, and INAF/OAR),
M. Tavani (INAF/IAPS and Uni. Roma Tor Vergata), F. Lucarelli,
F. Verrecchia(SSDC, and INAF/OAR), A. Argan, M. Cardillo, Y. Evangelista,
L. Foffano, G. Piano (INAF/IAPS), A. Addis, L. Baroncelli, A. Bulgarelli,
A. Di Piano, V. Fioretti, G.Panebianco, N. Parmiggiani (INAF/OAS-Bologna),
M. Romani (INAF/OA-Brera), M. Marisaldi (INAF/OAS-Bologna, Bergen
University),
M. Pilia, A. Trois (INAF/OA Cagliari), I. Donnarumma, E. Menegoni, A.Ursi
(ASI),
A. Giuliani (INAF/IASF-Mi) and P. Tempesta (TeleSpazio),
report on behalf of the AGILE Team:
The AGILE satellite detected the GRB 230402A at T0 = 2023-04-02 07:32:35 s
(UTC),
reported by Fermi GBM (GCN #33553).
The burst is clearly visible in the AGILE scientific ratemeters of the
MiniCALorimeter (MCAL; 0.4-100 MeV), and AntiCoincidence (AC; 50-200 keV)
detectors.
The event lasted about 6 s and it released a total number of 5504 counts in
the MCAL
detector (above a background rate of 576 Hz), and 23987 counts in AC
detector
(above a background rate of 2949 Hz). The AGILE ratemeters light curves can
be found
at http://www.agilescienceapp.it/notices/GRB230402A_AGILE_RM_ND.png .
At the T0, the event was 81 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 #33562
P K. Navaneeth (IUCAA), G. Waratkar (IITB), A. Vibhute (IUCAA), V.
Bhalerao (IITB), D. Bhattacharya (Ashoka University/IUCAA), A. R. Rao
(IUCAA/TIFR), and S. Vadawale (PRL) report on behalf of the AstroSat
CZTI collaboration:
Analysis of AstroSat CZTI data with the ML pipeline (Abraham et al.,
2021, MNRAS, 504, 3084) and the CIFT framework (Sharma et al., 2021,
JApA, 42, 73) showed the detection of a bright long GRB 230402A which
was also detected by Fermi (Fermi GBM Team, GCN 33553), and AGILE
(Casentini et al., GCN 33555).
The source was clearly detected in the 20-200 keV energy range. The
light curve peaks at 2023-04-02 07:32:36.5 UTC. The measured peak count
rate associated with the burst is 517 (+50, -55) counts/s above the
background in the combined data of all quadrants, with a total of 4283
(+374, -394) counts. The local mean background count rate was 456 (+3,
-4) counts/s. Using cumulative rates, we measure a T90 of 37 (+3, -5) s.
In the preliminary analysis, we find 588 Compton events associated with
this event.
The source was also clearly detected in the CsI anticoincidence (Veto)
detector in the 100-500 keV energy range. The light curve peaks at
2023-04-02 07:32:36.1 UTC. The measured peak count rate associated with
the burst is 692 (+67, -76) counts/s above the background in the
combined data of three quadrants (out of four), with a total of 5504
(+695, -805) counts. The local mean background count rate was 1185 (+2,
-2) counts/s. We measure a T90 of 37 (+21, -9) s from the cumulative
Veto light curve.
CZTI is built by a TIFR-led consortium of institutes across India,
including VSSC, URSC, IUCAA, SAC, and PRL. The Indian Space Research
Organisation funded, managed, and facilitated the project.
CZTI GRB detections are reported regularly on the payload site at:
http://astrosat.iucaa.in/czti/?q=grb
- GCN Circular #33563
M. L. Cherry (LSU), A. Yoshida, T. Sakamoto, S. Sugita (AGU),
Y. Kawakubo (LSU), K. Yamaoka (Nagoya U), S. Nakahira (RIKEN),
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 230402A (Fermi GBM Final Real-time Localization:
Fermi GBM team, GCN Circ. 33553; AGILE detection: Casentini et al.,
GCN Circ 33555; AstroSat CZTI detection: Navaneeth et al., GCN Circ.
33562) triggered the CALET Gamma-ray Burst Monitor (CGBM)at
07:32:38.72 UTC on 2 April 2023
(http://cgbm.calet.jp/cgbm_trigger/flight/1364455761/).
The burst signal was seen by only the SGM detector.
The burst light curve shows a single pulse that starts
at T-3.2 sec and ends at T+4.8 sec.
The T90 and T50 durations measured by the SGM data are 7.0 +/- 1.0 sec
and 4.0 +/- 1.0 sec (40-1000 keV), respectively.
The ground-processed light curve is available at
http://cgbm.calet.jp/cgbm_trigger/ground/1364455761/
The CALET data used in this analysis are provided by
the Waseda CALET Operation Center located at Waseda University.
- GCN Circular #33650
F. Longo (University and INFN, Trieste), E. Bissaldi (Politecnico and INFN,
Bari), N. Di Lalla (Stanford Univ.) and N. Omodei (Stanford Univ.) report
on behalf of the Fermi-LAT team:
At 07:32:35.96 on April, 02, 2023 Fermi-LAT detected high-energy emission
from GRB 230402A, which was also detected by Fermi-GBM (trigger 702113560 /
230402314, GCN 33553), AGILE (GCN 33555), AstroSat (GCN 33562) and CALET
(GCN 33563)
The best LAT on-ground location is found to be
RA, Dec =3D 96.4, -8.9 (J2000)
with an error radius of 0.4 deg (90 % containment, statistical error only).
This was 24 deg from the LAT boresight at the time of the trigger.
The data from the Fermi-LAT show a significant increase in the event rate
that is spatially and temporally correlated with the trigger with high significance.
The 100 MeV - 1 GeV photon flux in the time interval 0-300 s after the GBM
trigger is (7 =C2=B1 2)E-06 ph/cm2/s. The estimated photon index above 100
MeV is -2.6 =C2=B1 0.5.
The highest-energy photon is a 1.2 GeV event which is observed 14 seconds after the GBM trigger.
The Fermi-LAT point of contact for this burst is Francesco Longo (francesco.longo@ts.infn.it)
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 #33655
C. Malacaria (ISSI) and C. Meegan (UAH)
report on behalf of the Fermi GBM Team:
"At 07:32:35.96 UT on 02 April 2023, the Fermi Gamma-Ray Burst Monitor (GBM)
triggered and located GRB 230402A (trigger 702113560 / 230402314, GCN 33553),
which was also detected by AGILE (GCN 33555), AstroSat CZTI (GCN 33562),
CALET (GCN 33563) and Fermi-LAT (GCN 33650).
The Fermi GBM Final Real-time Localization (GCN 33553) is consistent
with the Fermi-LAT position.
The angle from the Fermi LAT boresight is 24 degrees.
The GBM light curve consists of a main peak
with a duration (T90) of about 63 s (50-300 keV).
The time-averaged spectrum from T0 s to T0+46 s is best fit by
a power law function with an exponential high-energy cutoff.
The power law index is -0.94 +/- 0.02 and
the cutoff energy, parameterized as Epeak, is 1030 +/- 81 keV.
A Band function fits the spectrum equally well with
Epeak= 995 +/- 85 keV, alpha = -0.93 +/- 0.02 and beta = -2.9 +/- 0.5 .
The event fluence (10-1000 keV) in this time interval is
(3.99 +/- 0.05)E-05 erg/cm^2. The 1-sec peak photon flux measured
starting from T0+0.3 s in the 10-1000 keV band
is 10.7 +/- 0.3 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/"
Previous IAU Circulars 
