GRB 231030B
GCN Circular 34915
Subject
GRB 231030B: Fermi GBM Final Real-time Localization
Date
2023-10-30T20:08:47Z (2 years ago)
From
Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>
Via
email
The Fermi GBM team reports the detection of a likely LONG GRB
At 19:58:19 UT on 30 Oct 2023, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 231030B (trigger 720388704.937126 / 231030832).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 244.0, Dec = 56.5 (J2000 degrees, equivalent to J2000 16h 15m, 56d 30'), with a statistical uncertainty of 1.1 degrees.
The angle from the Fermi LAT boresight is 47.0 degrees.
The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn231030832/quicklook/glg_skymap_all_bn231030832.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/bn231030832/quicklook/glg_healpix_all_bn231030832.fit
The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn231030832/quicklook/glg_lc_medres34_bn231030832.gif
GCN Circular 34916
Subject
GRB 231030B: BALROG localization (Fermi Trigger 720388704 / GRB 231030832)
Date
2023-10-30T20:28:59Z (2 years ago)
From
Jochen Greiner at MPE <jcgrog@mpe.mpg.de>
Via
email
T. Preis, B. Biltzinger, J. Burgess & J. Greiner (all MPE Garching) report:
The public trigdat data of the Fermi Gamma-ray Burst Monitor (GBM) trigger
720388704 at 19:58:19 on 30 Oct. 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) = 249.1+/-2.4 deg
Decl.(2000.0) = 63.3+/-0.9 deg
We estimate an additional systematic error of 2 deg.
Further details are available at:
https://grb.mpe.mpg.de/grb/GRB231030832/
The Healpix map can be downloaded from:
https://grb.mpe.mpg.de/grb/GRB231030832/healpix
The location parameters are available as JSON at:
https://grb.mpe.mpg.de/grb/GRB231030832/json
GCN Circular 34918
Subject
Fermi GRB 231030B: Global MASTER-Net observations report
Date
2023-10-30T20:46:00Z (2 years ago)
From
Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>
Via
legacy email
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-Tunka robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Applied Physics Institute, Irkutsk State University) started inspect of the Fermi GRB 231030B ( Fermi GBM team, GCN 34915) errorbox 118 sec after trigger time at 2023-10-30 20:00:18 UT, with upper limit up to 15.5 mag. The observations began at zenith distance = 70 deg. The sun altitude is -36.7 deg.
MASTER-Tavrida robotic telescope located in Russia (Lomonosov MSU, SAI Crimea astronomical station) started inspect of the Fermi GRB 231030B errorbox 53 sec after notice time and 175 sec after trigger time at 2023-10-30 20:01:15 UT, with upper limit up to 18.2 mag. The observations began at zenith distance = 71 deg. The sun altitude is -54.7 deg.
MASTER-Kislovodsk robotic telescope located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) started inspect of the Fermi GRB 231030B errorbox 446 sec after notice time and 567 sec after trigger time at 2023-10-30 20:07:47 UT, with upper limit up to 15.8 mag. The observations began at zenith distance = 74 deg. The sun altitude is -59.1 deg.
The galactic latitude b = 43 deg., longitude l = 86 deg.
Real time updated cover map and OT discovered available here:
https://master.sai.msu.ru/site/master2/observ.php?id=2293463
We obtain a following upper limits.
Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment
_________|_____________________|_____________________|____________________________________|_____|_______|_______|________
121 | 2023-10-30 20:00:18 | MASTER-Tunka | (16h 13m 30.71s , +58d 06m 31.2s) | C | 5 | 14.4 |
155 | 2023-10-30 20:00:49 | MASTER-Tunka | (16h 13m 43.99s , +53d 32m 52.4s) | C | 10 | 15.1 |
195 | 2023-10-30 20:01:15 | MASTER-Tavrida | (16h 20m 18.41s , +56d 18m 19.3s) | C | 40 | 17.5 |
194 | 2023-10-30 20:01:18 | MASTER-Tunka | (16h 13m 44.06s , +53d 32m 52.5s) | C | 30 | 15.5 |
243 | 2023-10-30 20:02:02 | MASTER-Tavrida | (16h 20m 24.49s , +56d 17m 16.7s) | C | 40 | 17.5 |
238 | 2023-10-30 20:02:08 | MASTER-Tunka | (16h 13m 44.28s , +53d 32m 52.5s) | C | 20 | 15.5 |
278 | 2023-10-30 20:02:47 | MASTER-Tunka | (16h 13m 44.42s , +53d 32m 52.6s) | C | 20 | 15.3 |
296 | 2023-10-30 20:02:51 | MASTER-Tavrida | (16h 20m 19.47s , +56d 16m 14.4s) | C | 50 | 18.0 |
315 | 2023-10-30 20:03:26 | MASTER-Tunka | (16h 13m 44.60s , +53d 32m 52.8s) | C | 15 | 15.1 |
363 | 2023-10-30 20:03:48 | MASTER-Tavrida | (16h 20m 25.51s , +56d 16m 32.7s) | C | 70 | 18.0 |
349 | 2023-10-30 20:04:01 | MASTER-Tunka | (16h 13m 44.71s , +53d 32m 52.6s) | C | 15 | 15.2 |
383 | 2023-10-30 20:04:35 | MASTER-Tunka | (16h 13m 44.83s , +53d 32m 52.9s) | C | 15 | 15.2 |
446 | 2023-10-30 20:05:05 | MASTER-Tavrida | (16h 20m 22.32s , +56d 17m 57.1s) | C | 80 | 17.9 |
423 | 2023-10-30 20:05:09 | MASTER-Tunka | (16h 13m 45.01s , +53d 32m 54.2s) | C | 25 | 15.3 |
464 | 2023-10-30 20:05:53 | MASTER-Tunka | (16h 13m 45.18s , +53d 32m 55.1s) | C | 20 | 15.4 |
503 | 2023-10-30 20:06:32 | MASTER-Tunka | (16h 13m 45.35s , +53d 32m 55.4s) | C | 20 | 15.3 |
543 | 2023-10-30 20:06:32 | MASTER-Tavrida | (16h 20m 22.35s , +56d 16m 18.7s) | C | 100 | 17.9 |
540 | 2023-10-30 20:07:11 | MASTER-Tunka | (16h 13m 45.45s , +53d 32m 55.2s) | C | 15 | 15.2 |
623 | 2023-10-30 20:07:47 | MASTER-Kislovodsk | (16h 16m 11.19s , +56d 43m 03.7s) | P| | 110 | 14.3 |
660 | 2023-10-30 20:08:20 | MASTER-Tavrida | (16h 20m 25.77s , +56d 18m 01.2s) | C | 120 | 18.0 |
616 | 2023-10-30 20:08:25 | MASTER-Tunka | (16h 13m 45.71s , +53d 32m 56.8s) | C | 20 | 15.3 |
768 | 2023-10-30 20:09:57 | MASTER-Kislovodsk | (16h 16m 15.48s , +56d 44m 31.6s) | P| | 140 | 14.3 |
802 | 2023-10-30 20:10:27 | MASTER-Tavrida | (16h 20m 19.55s , +56d 17m 03.2s) | C | 150 | 18.0 |
943 | 2023-10-30 20:12:38 | MASTER-Kislovodsk | (16h 16m 08.40s , +56d 43m 33.6s) | P| | 170 | 15.8 |
974 | 2023-10-30 20:13:04 | MASTER-Tavrida | (16h 20m 21.18s , +56d 18m 01.6s) | C | 180 | 18.0 |
1162 | 2023-10-30 20:16:11 | MASTER-Tavrida | (16h 20m 27.23s , +56d 17m 00.1s) | C | 180 | 18.1 |
1349 | 2023-10-30 20:19:19 | MASTER-Tavrida | (16h 20m 21.81s , +56d 15m 59.2s) | C | 180 | 18.1 |
1538 | 2023-10-30 20:22:28 | MASTER-Tavrida | (16h 20m 27.02s , +56d 16m 26.7s) | C | 180 | 18.1 |
1727 | 2023-10-30 20:25:36 | MASTER-Tavrida | (16h 20m 25.49s , +56d 17m 39.9s) | C | 180 | 18.2 |
1750 | 2023-10-30 20:25:59 | MASTER-Kislovodsk | (16h 16m 17.38s , +56d 42m 28.2s) | P| | 180 | 12.1 |
Filter C is a clear (unfiltred) band.
The observation and reduction will continue.
The message may be cited.
GCN Circular 34919
Subject
GRB 231030B: AstroSat CZTI detection
Date
2023-10-31T14:01:12Z (2 years ago)
From
Gaurav Waratkar at IIT Bombay <gauravwaratkar@iitb.ac.in>
Via
Web form
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 CIFT framework (Sharma et al., 2021, JApA, 42, 73) showed the detection of a likely long GRB 231030B which was also detected by Fermi-GBM (Fermi GBM Team, GCN Circ. 34915).
The source was clearly detected in the CZT detectors in the 20-200 keV energy range. The light curve peaks at 2023-10-30 19:58:21.25 UTC. The measured peak count rate associated with the burst is 356 (+57, -41) counts/s above the background in the combined data of three quadrants (out of four), with a total of 1131 (+128, -178) counts. The local mean background count rate was 242 (+2, -4) counts/s. Using cumulative rates, we measure a T90 of 6.4 (+2.1, -2.3) s.
The source was also clearly detected in the CsI anticoincidence (Veto) detector in the 100-500 keV energy range. The light curve peaks at 2023-10-30 19:58:20.73 UTC. The measured peak count rate associated with the burst is 705 (+74, -78) counts/s above the background in the combined data of all quadrants, with a total of 2538 (+365, -401) counts. The local mean background count rate was 1484 (+6, -7) counts/s. We measure a T90 of 7.4 (+3.6, -3.1) 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 34920
Subject
GRB 231030B: Fermi GBM Detection
Date
2023-10-31T14:33:19Z (2 years ago)
From
sumanbala2210@gmail.com
Via
Web form
S. Bala (USRA) and C. Meegan (UAH) report on behalf of
the Fermi Gamma-ray Burst Monitor Team:
"At 19:58:19.94 UT on 30 October 2023, the Fermi Gamma-ray Burst Monitor (GBM)
triggered and located GRB 231030B (trigger 720388704/231030832).
The Fermi GBM Final Real-time Localization is reported in GCN 34915.
The GBM light curve consists of a single bright peak with a duration (T90)
of about 10.8 s (50-300 keV). The time-averaged spectrum
from T0+0.003 to T0+20.544 s is best fit by
a Band function with Epeak = 240 +/- 20 keV,
alpha = -0.78 +/- 0.04, and beta = -2.02 +/- 0.08.
The event fluence (10-1000 keV) in this time interval is
(2.17 +/- 0.05)E-05 erg/cm^2. The 1-sec peak photon flux measured
starting from T0+1.3 s in the 10-1000 keV band is 24.7 +/- 0.4 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 34923
Subject
GRB 231030B: GRBAlpha detection
Date
2023-10-31T19:40:44Z (2 years ago)
From
Marianna Dafčíková at Masaryk University <500025@mail.muni.cz>
Via
Web form
M. Dafcikova, J. Ripa (Masaryk U.), A. Pal (Konkoly Observatory), N. Werner (Masaryk U.), M. Ohno, H. Takahashi (Hiroshima U.), L. Meszaros, B. Csak (Konkoly Observatory), N. Husarikova, F. Munz , M. Topinka, M. Kolar, J.-P. Breuer, F. Hroch (Masaryk U.), T. Urbanec, M. Kasal, A. Povalac (Brno U. of Technology), J. Hudec, J. Kapus, M. Frajt (Spacemanic s.r.o), R. Laszlo, M. Koleda (Needronix s.r.o), M. Smelko, P. Hanak, P. Lipovsky (Technical U. of Kosice), G. Galgoczi (Wigner Research Center/Eotvos U.), Y. Uchida, H. Poon, H. Matake (Hiroshima U.), N. Uchida (ISAS/JAXA), T. Bozoki (Eotvos U.), G. Dalya (Eotvos U.), yyT. Enoto (Kyoto U.), Zs. Frei (Eotvos U.), G. Friss (Eotvos U.), Y. Fukazawa, K. Hirose (Hiroshima U.), S. Hisadomi (Nagoya U.), Y. Ichinohe (Rikkyo U.), K. Kapas (Eotvos U.), L. L. Kiss (Konkoly Observatory), T. Mizuno (Hiroshima U.), K. Nakazawa (Nagoya U.), H. Odaka (Univ of Tokyo), J. Takatsy (Eotvos U.), K. Torigoe (Hiroshima U.), N. Kogiso, M. Yoneyama (Osaka Metropolitan U.), M. Moritaki (U. Tokyo), T. Kano (U. Michigan) -- the GRBAlpha collaboration.
The long-duration GRB 231030B (Fermi/GBM detection: GCN 34915; AstroSat/CZT detection: GCN 34919; INTEGRAL/SPI-ACS peak detection at 2023-10-30 ~19:58:20 UT) was observed by the GRBAlpha 1U CubeSat (Pal et al. 2023, A&A, 677, 40; arXiv:2302.10048).
The detection was confirmed at the peak time 2023-10-30 19:58:21 UTC. The T90 duration measured by GRBAlpha is 21 s and the overall significance during T90 reaches 15 sigma.
The light curve obtained by GRBAlpha is available here:
https://grbalpha.konkoly.hu/static/share/GRB231030B_GCN.pdf
All GRBAlpha detections are listed at: https://monoceros.physics.muni.cz/hea/GRBAlpha/
GRBAlpha, launched on 2021 March 22, is a demonstration mission for a future CubeSat constellation (Werner et al. Proc. SPIE 2018). The detector of GRBAlpha consists of a 75 x 75 x 5 mm3 CsI scintillator read out by a SiPM array, covering the energy range from ~50 keV to ~1000 keV. To increase the duty cycle and the downlink rate, the upgrade of the on-board data acquisition software stack is in progress. The ground segment is also supported by the radio amateur community and it takes advantage of the SatNOGS network for increased data downlink volume.