Gamma-ray Burst 230510B

(All information courtesy of the instrument teams.)

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Results of Observations

GCN Notice

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Wed 10 May 23 21:21:37 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      45
TRIGGER_NUM:     705446499
GRB_RA:          346.600d {+23h 06m 24s} (J2000),
                 346.884d {+23h 07m 32s} (current),
                 345.992d {+23h 03m 58s} (1950)
GRB_DEC:         +26.483d {+26d 28' 60"} (J2000),
                 +26.610d {+26d 36' 35"} (current),
                 +26.213d {+26d 12' 46"} (1950)
GRB_ERROR:       13.58 [deg radius, statistical plus systematic]
GRB_INTEN:       145 [cnts/sec]
DATA_SIGNIF:     7.80 [sigma]
INTEG_TIME:      1.024 [sec]
GRB_DATE:        20074 TJD;   130 DOY;   23/05/10
GRB_TIME:        76894.01 SOD {21:21:34.01} UT
GRB_PHI:         314.00 [deg]
GRB_THETA:        60.00 [deg]
DATA_TIME_SCALE: 1.0240 [sec]
HARD_RATIO:      0.23
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      91%  GRB
2nd_MOST_LIKELY:   6%  Cyg X-1
DETECTORS:       0,0,0, 1,0,1, 0,0,0, 0,0,0, 0,0,
SUN_POSTN:        47.52d {+03h 10m 05s}  +17.73d {+17d 43' 44"}
SUN_DIST:         56.36 [deg]   Sun_angle= 4.0 [hr] (West of Sun)
MOON_POSTN:      300.29d {+20h 01m 09s}  -25.87d {-25d 52' 07"}
MOON_DIST:        69.06 [deg]
MOON_ILLUM:      70 [%]
GAL_COORDS:       95.50,-30.73 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      359.15, 29.45 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230510890/quicklook/glg_lc_medres34_bn230510890.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 49.85,14.77 [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 10 May 23 21:21:45 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      58
TRIGGER_NUM:     705446499
GRB_RA:          345.500d {+23h 02m 00s} (J2000),
                 345.779d {+23h 03m 07s} (current),
                 344.903d {+22h 59m 37s} (1950)
GRB_DEC:         +31.800d {+31d 48' 00"} (J2000),
                 +31.926d {+31d 55' 33"} (current),
                 +31.531d {+31d 31' 51"} (1950)
GRB_ERROR:       7.18 [deg radius, statistical plus systematic]
GRB_INTEN:       229 [cnts/sec]
DATA_SIGNIF:     23.50 [sigma]
INTEG_TIME:      4.096 [sec]
GRB_DATE:        20074 TJD;   130 DOY;   23/05/10
GRB_TIME:        76894.01 SOD {21:21:34.01} UT
GRB_PHI:         317.00 [deg]
GRB_THETA:        55.00 [deg]
DATA_TIME_SCALE: 4.0960 [sec]
HARD_RATIO:      0.52
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      93%  GRB
2nd_MOST_LIKELY:   4%  Generic Transient
DETECTORS:       0,0,0, 1,0,1, 0,0,0, 0,0,0, 0,0,
SUN_POSTN:        47.52d {+03h 10m 05s}  +17.73d {+17d 43' 44"}
SUN_DIST:         57.06 [deg]   Sun_angle= 4.1 [hr] (West of Sun)
MOON_POSTN:      300.29d {+20h 01m 09s}  -25.87d {-25d 52' 06"}
MOON_DIST:        72.26 [deg]
MOON_ILLUM:      69 [%]
GAL_COORDS:       97.28,-25.56 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:        1.00, 34.62 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230510890/quicklook/glg_lc_medres34_bn230510890.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 49.85,14.77 [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 10 May 23 21:21:52 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      57
TRIGGER_NUM:     705446499
GRB_RA:            4.150d {+00h 16m 36s} (J2000),
                   4.454d {+00h 17m 49s} (current),
                   3.500d {+00h 14m 00s} (1950)
GRB_DEC:         +27.630d {+27d 37' 48"} (J2000),
                 +27.760d {+27d 45' 35"} (current),
                 +27.352d {+27d 21' 08"} (1950)
GRB_ERROR:       3.50 [deg radius, statistical only]
DATA_SIGNIF:     24.30 [sigma]
DATA_INTERVAL:   4.096 [sec]
GRB_DATE:        20074 TJD;   130 DOY;   23/05/10
GRB_TIME:        76894.01 SOD {21:21:34.01} UT
GRB_PHI:         329.00 [deg]
GRB_THETA:        68.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   4173 (Gnd S/W Version number)
SUN_POSTN:        47.52d {+03h 10m 05s}  +17.73d {+17d 43' 44"}
SUN_DIST:         40.74 [deg]   Sun_angle= 2.9 [hr] (West of Sun)
MOON_POSTN:      300.29d {+20h 01m 09s}  -25.87d {-25d 52' 05"}
MOON_DIST:        81.73 [deg]
MOON_ILLUM:      69 [%]
GAL_COORDS:      113.55,-34.61 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       15.39, 23.58 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230510890/quicklook/glg_lc_medres34_bn230510890.gif
POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_705446499.fits
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
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 Circular #33759
The Fermi GBM team reports the detection of a likely LONG GRB
At 21:21:34 UT on 10 May 2023, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 230510B (trigger 705446499.012602 / 230510890).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 4.5, Dec = 30.0 (J2000 degrees, equivalent to J2000 00h 18m, 30d 00'), with a statistical uncertainty of 1.0 degrees.
The angle from the Fermi LAT boresight is 66.0 degrees.
The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230510890/quicklook/glg_skymap_all_bn230510890.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/bn230510890/quicklook/glg_healpix_all_bn230510890.fit
The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230510890/quicklook/glg_lc_medres34_bn230510890.gif
GCN Circular #33760
M. Nakajima (Nihon U.), Y. Kawakubo (LSU), S. Sugita, M. Serino (AGU), H. Negoro, K. Kobayashi, M. Tanaka, Y. Soejima, Y. Kudo (Nihon U.), T. Mihara, T. Kawamuro, S. Yamada, T. Tamagawa, N. Kawai, M. Matsuoka (RIKEN), T. Sakamoto, H. Hiramatsu, H. Nishikawa, A. Yoshida (AGU), Y. Tsuboi, S. Urabe, S. Nawa, N. Nemoto (Chuo U.), M. Shidatsu (Ehime U.), I. Takahashi, M. Niwano, S. Sato, N. Higuchi, Y. Yatsu (Tokyo Tech), S. Nakahira, S. Ueno, H. Tomida, M. Ishikawa, S. Ogawa, T. Kurihara (JAXA), Y. Ueda, K. Setoguchi, T. Yoshitake, Y. Nakatani (Kyoto U.), M. Yamauchi, Y. Hagiwara, Y. Umeki, Y. Otsuki (Miyazaki U.), K. Yamaoka (Nagoya U.), M. Sugizaki (NAOC), W. Iwakiri (Chiba U.) report on behalf of the MAXI team:
The MAXI/GSC nova alert system triggered a bright uncatalogued X-ray transient source at 21:22:03 UT 10 May 2023. Assuming that the source flux was constant over the transit, we obtain the source position at (R.A., Dec) = (0.692 deg, 27.541 deg) = (00 02 46, +27 32 27) (J2000) with a statistical 90% C.L. elliptical error region with long and short radii of 0.15 deg and 0.14 deg, respectively. The roll angle of long axis from the north direction is 139.0 deg counterclockwise. Without assumptions on the source constancy, we obtain a rectangular error box for the transient source with the following corners:
```
(R.A., Dec) = (0.127, 28.437) deg = (00 00 30, +28 26 13) (J2000)
(R.A., Dec) = (359.878, 28.290) deg = (23 59 30, +28 17 23) (J2000)
(R.A., Dec) = (0.966, 26.843) deg = (00 03 51, +26 50 34) (J2000)
(R.A., Dec) = (1.213, 26.988) deg = (00 04 51, +26 59 16) (J2000)
```
There is an additional systematic uncertainty of 0.1 deg (90% containment radius). The trigger time and position was consistent with that of GRB 230510B (Fermi GBM, GCN 33759) The X-ray flux averaged over the scan was 635 +- 75 mCrab (4.0-10.0keV, 1 sigma error). There was no significant excess flux in the previous transit at 19:49 UT and in the next transit at 22:54 UT with an upper limit of 20 mCrab for each.
GCN Circular #33763
P. S. Marrocchesi (U of Siena), 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), M. L. Cherry (LSU), S. Ricciarini (U of Florence), and the CALET collaboration:
The long GRB 230510B (Fermi GBM Final Real-time Localization: Fermi GBM team, GCN Circ. 33759; MAXI/GSC detection: Nakajima et al., GCN Circ 33760) triggered the CALET Gamma-ray Burst Monitor (CGBM) at 21:21:32.08 UTC on 10 May 2023 (http://cgbm.calet.jp/cgbm_trigger/flight/1367788853/index.html). The burst signal was seen by all CGBM detectors.
The burst light curve shows a double-peaked structure that starts at T-45.5 sec, peaks at T+23.4 sec, and ends at T+263.9 sec. The T90 and T50 durations measured by the SGM data are 233.0 +/- 3.3 sec and 168.5 +/- 0.8 sec (40-1000 keV), respectively.
The ground-processed light curve is available at
http://cgbm.calet.jp/cgbm_trigger/ground/1367788853/
The CALET data used in this analysis are provided by the Waseda CALET Operation Center located at Waseda University.
GCN Circular #33765
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-SAAO robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in South Africa (South African Astronomical Observatory) started inspect of the Fermi GRB230510.89 (trigger No 705446499,00h 18m 07.20s , +30d 03m 00.0s, R=1) errorbox 24859 sec after notice time and 24865 sec after trigger time at 2023-05-11 04:15:59 UT, with upper limit up to 15.4 mag. Observations started at twilight. The observations began at zenith distance = 78 deg. The sun altitude is -13.2 deg.
The galactic latitude b = -32 deg., longitude l = 115 deg.
Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2215917
We obtain a following upper limits.
```
Tmid-T0  |      Date Time      |          Site       |             Coord (J2000)          |Filt.| Expt. | Limit| Comment
_________|_____________________|_____________________|____________________________________|_____|_______|_______|________

   24896 | 2023-05-11 04:15:59 |         MASTER-SAAO | (00h 10m 43.55s , +29d 26m 26.1s) |   C |    60 | 15.4 |        
   24896 | 2023-05-11 04:15:59 |         MASTER-SAAO | (00h 11m 34.98s , +29d 25m 36.2s) |   C |    60 | 15.1 |        
   25198 | 2023-05-11 04:21:02 |         MASTER-SAAO | (00h 20m 47.13s , +29d 25m 15.6s) |   C |    60 | 13.8 |        
```
Filter C is a clear (unfiltred) band.
The observation and reduction will continue. The message may be cited.
GCN Circular #33772
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 long GRB 230510B which was also detected by Fermi (Fermi GBM Team, GCN Circ. 33759), MAXI/GSC (Nakajima et al., GCN Circ. 33760), and CALET (Marrocchesi et al., GCN Circ. 33763).
The source was detected in the 20-200 keV energy range. The light curve showed multiple peaks of emission with the strongest peak at 2023-05-10 21:21:52.50 UTC. The measured peak count rate associated with the burst is 98 (+43, -2) counts/s above the background in the combined data of three quadrants (out of four), with a total of 4971 (+1144, -1220) counts. The local mean background count rate was 313 (+1, -1) counts/s. Using cumulative rates, we measure a T90 of 270 (+36, -58) s.
The source was also clearly detected in the CsI anticoincidence (Veto) detector in the 100-500 keV energy range.The light curve showed multiple peaks of emission with the strongest peak at 2023-05-10 21:21:52.50 UTC. The measured peak count rate associated with the burst is 316 (+77, -19) counts/s above the background in the combined data of all quadrants, with a total of 11559 (+2752, -3027) counts. The local mean background count rate was 1315 (+3, -3) counts/s. We measure a T90 of 202 (+36, -10) 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 #33806
O.J. Roberts (USRA/NASA-MSFC), S. Bala (USRA), J. Wood (NASA-MSFC) and C. Meegan (UAH) report on behalf of the Fermi GBM Team:
"At 21:21:34.01 UT on 10 May 2023, the Fermi Gamma-Ray Burst Monitor (GBM) triggered and located GRB 230510B (trigger 705446499 /230510890), which was also detected by MAXI/GSC (M. Nakajima et al. 2023, GCN 33760), CALET (P.S. Marrocchesi et al. 2023, GCN 33763), and CZTI/AstroSat (P.K. Navaneeth et al. 2023, GCN 33772). The Fermi GBM Final Real-time Localization (GCN 33759) is consistent with the MAXI/GSC position.
The angle from the Fermi LAT boresight at the GBM trigger time is 60 degrees.
The GBM light curve consists of two distinct peaks with multiple short peaks in between with a duration (T90) of about 466 s (50-300 keV). The time-averaged spectrum from T0-5.12 s to T0+650.81 s is best fit by a Band function, with Epeak= 341 +/- 28 keV, alpha = -1.32 +/- 0.02, and beta = -2.01 +/- 0.06.
The event fluence (10-1000 keV) in this time interval is (1.28 +/- 0.01)E-04 erg/cm^2. The 1-sec peak photon flux measured starting from T0+194 s in the 10-1000 keV band is 8.12 +/- 0.26 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 #33811
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. o= f 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.), T. Enoto (Kyoto U.), Zs. Frei (Eotvos U.), G. Fris= s (Eotvos U.), Y. Fukazawa, K. Hirose (Hiroshima U.), S. Hisadomi (Nagoya U= .), Y. Ichinohe (Rikkyo U.), K. Kapas (Eotvos U.), L. L. Kiss (Konkoly Obse= rvatory), T. Mizuno (Hiroshima U.), K. Nakazawa (Nagoya U.), H. Odaka (Uni= v of Tokyo), J. Takatsy (Eotvos U.), K. Torigoe (Hiroshima U.), N. Kogiso, = M. Yoneyama (Osaka Metropolitan U.), M. Moritaki (U. Tokyo), T. Kano (U. Mi= chigan) -- the GRBAlpha collaboration.
The long-duration GRB 230510B (Fermi/GBM detection: GCN 33759; CALET/CGBM d= etection: GCN 33763; AstroSat detection: GCN 33772; Wind/Konus detection at= 2023-05-10 21:21:35.995 UT; INTEGRAL/SPI-ACS detection at 2023-05-10 21:21= :45 UT; GECAM-B trig. no. 178) was observed by the GRBAlpha 1U CubeSat (Pal= et al. 2023; arXiv:2302.10048).
The detection was confirmed at the peak time 2023-05-10 21:20:55 UTC. The T= 90 duration measured by GRBAlpha is 198 s and the overall significance duri= ng T90 reaches 14 sigma in the 80-400 keV band.
The light curve obtained by GRBAlpha is available here: https://grbalpha.konkoly.hu/static/share/GRB230510B_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 futur= e CubeSat constellation (Werner et al. Proc. SPIE 2018). The detector of GR= BAlpha consists of a 75 x 75 x 5 mm3 CsI scintillator read out by a SiPM ar= ray, covering the energy range from ~50 keV to ~1000 keV. To increase the d= uty cycle and the downlink rate, the upgrade of the on-board data acquisiti= on software stack is in progress. The ground segment is also supported by t= he radio amateur community and it takes advantage of the SatNOGS network fo= r increased data downlink volume.

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