GRB 230313A
GCN Circular 33467
Subject
GRB 230313A: Fermi GBM Final Real-time Localization
Date
2023-03-13T11:46:22Z (2 years ago)
From
Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>
The Fermi GBM team reports the detection of a likely LONG GRB
At 11:38:43 UT on 13 Mar 2023, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 230313A (trigger 700400328.006796 / 230313485).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 202.4, Dec = 47.2 (J2000 degrees, equivalent to J2000 13h 29m, 47d 12'), with a statistical uncertainty of 1.6 degrees.
The angle from the Fermi LAT boresight is 107.0 degrees.
The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230313485/quicklook/glg_skymap_all_bn230313485.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/bn230313485/quicklook/glg_healpix_all_bn230313485.fit
The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230313485/quicklook/glg_lc_medres34_bn230313485.gif
GCN Circular 33468
Subject
Fermi GRB 230313A: Global MASTER-Net observations report
Date
2023-03-13T12:15:14Z (2 years ago)
From
Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>
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-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 230313A ( Fermi GBM team, GCN 33467) errorbox 34 sec after notice time and 69 sec after trigger time at 2023-03-13 11:39:52 UT, with upper limit up to 15.6 mag. The observations began at zenith distance = 57 deg. The sun altitude is -21.1 deg.
The galactic latitude b = 69 deg., longitude l = 104 deg.
Real time updated cover map and OT discovered available here:
https://master.sai.msu.ru/site/master2/observ.php?id=2204375
We obtain a following upper limits.
Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment
_________|_____________________|_____________________|____________________________________|_____|_______|_______|________
74 | 2023-03-13 11:39:52 | MASTER-Amur | (13h 42m 32.30s , +48d 00m 17.7s) | C | 10 | 13.3 |
114 | 2023-03-13 11:40:27 | MASTER-Amur | (13h 22m 24.94s , +47d 06m 29.4s) | C | 20 | 14.3 |
159 | 2023-03-13 11:41:06 | MASTER-Amur | (13h 22m 25.83s , +47d 07m 25.7s) | C | 30 | 14.6 |
213 | 2023-03-13 11:41:56 | MASTER-Amur | (13h 22m 30.64s , +47d 06m 59.6s) | C | 40 | 14.6 |
278 | 2023-03-13 11:42:55 | MASTER-Amur | (13h 22m 26.23s , +47d 05m 20.0s) | C | 50 | 14.9 |
352 | 2023-03-13 11:44:05 | MASTER-Amur | (13h 22m 30.88s , +47d 06m 11.1s) | C | 60 | 14.8 |
457 | 2023-03-13 11:45:40 | MASTER-Amur | (13h 22m 21.14s , +47d 09m 33.7s) | C | 80 | 14.9 |
567 | 2023-03-13 11:47:19 | MASTER-Amur | (13h 22m 14.50s , +47d 08m 42.4s) | C | 100 | 14.9 |
701 | 2023-03-13 11:49:19 | MASTER-Amur | (13h 22m 15.66s , +47d 09m 39.3s) | C | 130 | 15.0 |
866 | 2023-03-13 11:51:48 | MASTER-Amur | (13h 22m 20.83s , +47d 08m 38.9s) | C | 160 | 15.5 |
1055 | 2023-03-13 11:54:48 | MASTER-Amur | (13h 22m 15.07s , +47d 07m 36.5s) | C | 180 | 15.4 |
1255 | 2023-03-13 11:58:07 | MASTER-Amur | (13h 22m 21.36s , +47d 07m 41.7s) | C | 180 | 15.4 |
1454 | 2023-03-13 12:01:27 | MASTER-Amur | (13h 22m 19.28s , +47d 09m 04.9s) | C | 180 | 15.5 |
1654 | 2023-03-13 12:04:46 | MASTER-Amur | (13h 22m 19.50s , +47d 07m 47.1s) | C | 180 | 15.6 |
1793 | 2023-03-13 12:08:06 | MASTER-Amur | (13h 22m 31.48s , +46d 43m 11.8s) | C | 60 | 14.8 |
1873 | 2023-03-13 12:09:26 | MASTER-Amur | (13h 23m 26.57s , +46d 42m 44.8s) | C | 60 | 14.8 |
Filter C is a clear (unfiltred) band.
The observation and reduction will continue.
The message may be cited.
GCN Circular 33469
Subject
GRB 230313A: BALROG localization (Fermi Trigger 700400328 / GRB 230313485)
Date
2023-03-13T12:42:40Z (2 years ago)
From
Jochen Greiner at MPE,Garching <jcg@mpe.mpg.de>
B. Biltzinger, F. Kunzweiler, F. Berlato, J. Burgess & J. Greiner (all MPE Garching) report:
The public trigdat data of the Fermi Gamma-ray Burst Monitor (GBM) trigger
700400328 at 11:38:43 on 13 March 2023 were automatically fitted for spectrum
and sky location with BALROG (Burgess et al. 2018, MNRAS 476, 1427;
Berlato et al. 2019, ApJ 873, 60).
The best-fit position (1 sigma statistical errors) is:
RA(2000.0) = 201.0+/-2.1 deg
Decl.(2000.0) = 52.3+/-2.3 deg
We estimate an additional systematic error of 2 deg.
Further details are available at:
https://grb.mpe.mpg.de/grb/GRB230313485/
The Healpix map can be downloaded from:
https://grb.mpe.mpg.de/grb/GRB230313485/healpix
The location parameters are available as JSON at:
https://grb.mpe.mpg.de/grb/GRB230313485/json
GCN Circular 33479
Subject
GRB 230313A: AstroSat CZTI detection
Date
2023-03-15T03:17:07Z (2 years ago)
From
Gaurav Waratkar at IIT,Bombay <gauravwaratkar@iitb.ac.in>
A. Ahmad (IITB), G. Waratkar (IITB), P K. Navaneeth (IUCAA), 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 CIFT framework (Sharma et al.,
2021, JApA, 42, 73) showed the detection of a long GRB 230313A which was
also detected by Fermi GBM (GCN Circ. 33467).
The source was faintly detected in the 20-200 keV energy range. The
light curve peaks at 2023-03-13 11:38:43.9 UTC. The measured peak count
rate associated with the burst is 211.1 (+167.6 -9.9) counts/s above the
background in the combined data of three quadrants (out of four), with a
total of 259 (+104 -110) counts. The local mean background count rate
was 371.0 (+8.7 -8.6) counts/s. Using cumulative rates, we measure a T90
of 3.68 (+0.61 -2.44) s.
It was also faintly detected in the CsI anticoincidence (Veto) detector
in the 100-500 keV energy range. The light curve peaks at 2023-03-13
11:38:43.2 UTC. The measured peak count rate is 270.4 (+59.6 -65.5)
counts/s above the background in the combined Veto data of three
quadrants (out of four), with a total of 463 (+172 -181) counts. The
local mean background count rate was 1116.0 (+5.4 -6.4) counts/s. We
measure a T90 of 4.28 (+1.18 -3.20) 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