Gamma-ray Burst 230209B

(All information courtesy of the instrument teams.)

Previous IAU Circulars

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Results of Observations

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Thu 09 Feb 23 22:33:06 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      47
TRIGGER_NUM:     697674761
GRB_RA:           79.183d {+05h 16m 44s} (J2000),
                  79.543d {+05h 18m 10s} (current),
                  78.405d {+05h 13m 37s} (1950)
GRB_DEC:         +26.817d {+26d 49' 00"} (J2000),
                 +26.840d {+26d 50' 26"} (current),
                 +26.763d {+26d 45' 45"} (1950)
GRB_ERROR:       6.07 [deg radius, statistical plus systematic]
GRB_INTEN:       1025 [cnts/sec]
DATA_SIGNIF:     48.10 [sigma]
INTEG_TIME:      1.024 [sec]
GRB_DATE:        19984 TJD;    40 DOY;   23/02/09
GRB_TIME:        81156.89 SOD {22:32:36.89} UT
GRB_PHI:         130.00 [deg]
GRB_THETA:        75.00 [deg]
DATA_TIME_SCALE: 1.0240 [sec]
HARD_RATIO:      0.44
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      76%  GRB
2nd_MOST_LIKELY:  20%  GRO_J0422_32
DETECTORS:       0,0,0, 0,0,0, 0,0,0, 0,1,1, 0,0,
SUN_POSTN:       323.31d {+21h 33m 13s}  -14.52d {-14d 31' 19"}
SUN_DIST:        119.68 [deg]   Sun_angle= -7.7 [hr] (East of Sun)
MOON_POSTN:      187.43d {+12h 29m 42s}   -0.46d {-00d 27' 22"}
MOON_DIST:       106.12 [deg]
MOON_ILLUM:      85 [%]
GAL_COORDS:      178.28, -6.50 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       80.34,  3.74 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230209939/quicklook/glg_lc_medres34_bn230209939.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 250.53,10.00 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Thu 09 Feb 23 22:33:24 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      58
TRIGGER_NUM:     697674761
GRB_RA:           87.240d {+05h 48m 58s} (J2000),
                  87.592d {+05h 50m 22s} (current),
                  86.479d {+05h 45m 55s} (1950)
GRB_DEC:         +23.400d {+23d 23' 60"} (J2000),
                 +23.406d {+23d 24' 21"} (current),
                 +23.385d {+23d 23' 05"} (1950)
GRB_ERROR:       2.06 [deg radius, statistical only]
DATA_SIGNIF:     67.60 [sigma]
DATA_INTERVAL:   2.048 [sec]
GRB_DATE:        19984 TJD;    40 DOY;   23/02/09
GRB_TIME:        81156.89 SOD {22:32:36.89} UT
GRB_PHI:         134.00 [deg]
GRB_THETA:        82.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   4173 (Gnd S/W Version number)
SUN_POSTN:       323.31d {+21h 33m 13s}  -14.52d {-14d 31' 19"}
SUN_DIST:        126.87 [deg]   Sun_angle= -8.3 [hr] (East of Sun)
MOON_POSTN:      187.43d {+12h 29m 43s}   -0.46d {-00d 27' 26"}
MOON_DIST:        99.20 [deg]
MOON_ILLUM:      85 [%]
GAL_COORDS:      185.13, -2.22 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       87.47, -0.02 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230209939/quicklook/glg_lc_medres34_bn230209939.gif
POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_697674761.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 NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Thu 09 Feb 23 22:42:02 UT
NOTICE_TYPE:     Fermi-GBM Final Position
RECORD_NUM:      0
TRIGGER_NUM:     697674761
GRB_RA:           87.200d {+05h 48m 48s} (J2000),
                  87.552d {+05h 50m 12s} (current),
                  86.439d {+05h 45m 45s} (1950)
GRB_DEC:         +23.480d {+23d 28' 48"} (J2000),
                 +23.486d {+23d 29' 09"} (current),
                 +23.465d {+23d 27' 52"} (1950)
GRB_ERROR:       1.79 [deg radius, statistical only]
GRB_DATE:        19984 TJD;    40 DOY;   23/02/09
GRB_TIME:        81156.89 SOD {22:32:36.89} UT
GRB_PHI:         134.00 [deg]
GRB_THETA:        82.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   41731 (Gnd S/W Version number)
SUN_POSTN:       323.31d {+21h 33m 15s}  -14.52d {-14d 31' 12"}
SUN_DIST:        126.83 [deg]   Sun_angle= -8.3 [hr] (East of Sun)
MOON_POSTN:      187.49d {+12h 29m 58s}   -0.49d {-00d 29' 30"}
MOON_DIST:        99.31 [deg]
MOON_ILLUM:      85 [%]
GAL_COORDS:      185.04, -2.22 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       87.43,  0.07 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230209939/quicklook/glg_lc_medres34_bn230209939.gif
LOC_URL:         http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230209939/quicklook/glg_locplot_all_bn230209939.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:        This is likely a Long GRB.  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(1.0<100sec) coincident with the INTEGRAL_SPIACS event (trignum=10198).

GCN Circular #33310
The Fermi GBM team reports the detection of a likely LONG GRB
At 22:32:36 UT on 9 Feb 2023, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 230209B (trigger 697674761.889546 / 230209939).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 87.2, Dec = 23.5 (J2000 degrees, equivalent to J2000 05h 48m, 23d 30'), with a statistical uncertainty of 1.8 degrees.
The angle from the Fermi LAT boresight is 82.0 degrees.
The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230209939/quicklook/glg_skymap_all_bn230209939.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/bn230209939/quicklook/glg_healpix_all_bn230209939.fit
The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230209939/quicklook/glg_lc_medres34_bn230209939.gif

GCN Circular #33311
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 GRB 230209B ( Fermi GBM team, GCN 33310) errorbox 78 sec after notice time and 112 sec after trigger time at 2023-02-09 22:34:29 UT, with upper limit up to 17.6 mag. The observations began at zenith distance = 74 deg. The sun altitude is -43.2 deg.
The galactic latitude b = -2 deg., longitude l = 185 deg.
Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2197905
We obtain a following upper limits.

Tmid-T0  |      Date Time      |          Site       |             Coord (J2000)          |Filt.| Expt. | Limit| Comment
_________|_____________________|_____________________|____________________________________|_____|_______|_______|________

     123 | 2023-02-09 22:34:29 |         MASTER-SAAO | (05h 48m 38.85s , +23d 25m 41.1s) |   C |    20 | 17.3 |        
     123 | 2023-02-09 22:34:29 |         MASTER-SAAO | (05h 47m 42.98s , +23d 26m 01.2s) |   C |    20 | 16.6 |        
     167 | 2023-02-09 22:35:09 |         MASTER-SAAO | (05h 48m 43.58s , +23d 26m 01.0s) |   C |    30 | 17.5 |        
     167 | 2023-02-09 22:35:09 |         MASTER-SAAO | (05h 47m 47.64s , +23d 26m 21.7s) |   C |    30 | 16.9 |        
     233 | 2023-02-09 22:36:09 |         MASTER-SAAO | (05h 48m 41.95s , +23d 27m 14.2s) |   C |    40 | 17.6 |        
     233 | 2023-02-09 22:36:10 |         MASTER-SAAO | (05h 47m 46.01s , +23d 27m 36.0s) |   C |    40 | 17.0 |        
     298 | 2023-02-09 22:37:09 |         MASTER-SAAO | (05h 48m 42.43s , +23d 25m 55.7s) |   C |    50 | 17.6 |        
     298 | 2023-02-09 22:37:09 |         MASTER-SAAO | (05h 47m 46.50s , +23d 26m 18.0s) |   C |    50 | 17.0 |        
     389 | 2023-02-09 22:38:30 |         MASTER-SAAO | (05h 48m 45.87s , +23d 27m 28.8s) |   C |    70 | 17.5 |        
     389 | 2023-02-09 22:38:30 |         MASTER-SAAO | (05h 47m 49.96s , +23d 27m 51.9s) |   C |    70 | 16.9 |        
     649 | 2023-02-09 22:42:26 |         MASTER-SAAO | (05h 48m 40.23s , +23d 31m 32.5s) |   C |   120 | 17.1 |        
     649 | 2023-02-09 22:42:26 |         MASTER-SAAO | (05h 47m 43.59s , +23d 32m 07.7s) |   C |   120 | 16.5 |        
     810 | 2023-02-09 22:44:56 |         MASTER-SAAO | (05h 48m 36.07s , +23d 30m 39.6s) |   C |   140 | 16.9 |        
     810 | 2023-02-09 22:44:56 |         MASTER-SAAO | (05h 47m 39.45s , +23d 31m 15.3s) |   C |   140 | 16.2 |        
    1000 | 2023-02-09 22:47:47 |         MASTER-SAAO | (05h 48m 43.26s , +23d 30m 46.1s) |   C |   180 | 17.1 |        
    1000 | 2023-02-09 22:47:47 |         MASTER-SAAO | (05h 47m 46.69s , +23d 31m 22.6s) |   C |   180 | 16.2 |

Filter C is a clear (unfiltred) band.
The observation and reduction will continue. The message may be cited.

GCN Circular #33315
Gayathri Raman (PSU), Jamie A. Kennea (PSU), James DeLaunay (UAlabama), Aaron Tohuvavohu (U Toronto) report:
Swift/BAT did not localize GRB 230209B onboard (T0: 2023-02-09T22:32:36 UTC, Fermi/GBM GCN 33310, INTEGRAL trig 10198).
The Fermi and INTEGRAL 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 2022, ApJ, 941, 169), detects the burst with a sqrt(TS) of 42.1 in a 2.048 s analysis time bin. The burst duration as seen by BAT is ~60 s.
NITRATES results indicate a burst coming from outside the FOV, with DeltaLLHOut of -53. The NITRATES best fit OFOV position is consistent with the Fermi/GBM localization (GCN 33310).
See Section 9.1 and Figures 10 and 17 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 #33323
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,
D. Svinkin, D. Frederiks, A. Ridnaia, A. Lysenko, and T. Cline on behalf of the Konus-Wind team,
A. Goldstein, M. S. Briggs, C. Wilson-Hodge, and E. Burns on behalf of the Fermi GBM team,
E. Bozzo and C. Ferrigno, on behalf of the INTEGRAL SPI-ACS GRB 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 230209B (Fermi-GBM detection: the Fermi GBM team, GCN Circ. 33310; Swift/BAT-GUANO detection: Raman et al., GCN Circ. 33315) was detected by Fermi (GBM trigger 697674761), Konus-Wind, INTEGRAL (SPI-ACS), Swift (BAT), Mars-Odyssey (HEND), and BepiColombo (MGNS) at about 81157 s UT (22:32:37). The burst was outside the coded field of view of the BAT.
We have triangulated it to a preliminary, error box whose coordinates are:
```
  ---------------------------------------------
   RA(2000), deg                 Dec(2000), deg
  ---------------------------------------------
  Center:
    89.366 (05h 57m 28s) +29.199 (+29d 11' 57")
  Corners:
    89.445 (05h 57m 47s) +29.700 (+29d 41' 58")
    89.336 (05h 57m 21s) +30.139 (+30d 08' 22")
    89.289 (05h 57m 09s) +28.600 (+28d 35' 59")
    89.401 (05h 57m 36s) +27.754 (+27d 45' 15")
  ---------------------------------------------
```
The error box area is 674 sq. arcmin, and its maximum dimension is 2.4 deg (the minimum one is 6.6 arcmin). The Sun distance was 128 deg.
This box may be improved.
A triangulation map and HEALPix FITS file are posted at http://www.ioffe.ru/LEA/GRBs/GRB230209_T81161/IPN
The Konus-Wind time history and spectrum will be given in a forthcoming GCN Circular.
GCN Circular #33324
S. Dalessi (UAH) and C.Meegan (UAH) report on behalf of the Fermi GBM Team:
"At 22:32:36.89 UT on 09 February 2023, the Fermi Gamma-Ray Burst Monitor (GBM) triggered and located GRB 230209B (trigger 697674761 / 230209939) which was also detected by the Swift/BAT-GUANO (G. Raman et al. 2023, GCN 33315). The Fermi GBM Final Real-time Localization (GCN #33310) is consistent with the localization by the IPN network (Kozyrev et al. 2023, GCN 33323).
The angle from the Fermi LAT boresight at the GBM trigger time is 76 degrees.
The GBM light curve consists of multiple peaks with a duration (T90) of about 67 s (50-300 keV). The time-averaged spectrum from T0-2.82 s to T0+68.87 s is best fit by a Band function with Epeak = 183 +/- 6 keV, alpha = -0.34 +/- 0.04, and beta = -2.44 +/- 0.09.
The event fluence (10-1000 keV) in this time interval is (3.669 +/- 0.052)E-05 erg/cm^2. The 1-sec peak photon flux measured starting from T0+0.83 s in the 10-1000 keV band is 16.4 +/- 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 #33325
C. Casentini (INAF/IAPS), M. Tavani (INAF/IAPS, and Univ. Roma Tor Vergata), C. Pittori, F. Lucarelli, F. Verrecchia (SSDC, and INAF/OAR), A. Argan, M. Cardillo, Y. Evangelista, L. Foffano, E. Menegoni, 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), F. Longo (Uni. Trieste, INFN Trieste), M. Pilia, A. Trois (INAF/OA Cagliari), I. Donnarumma, 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 230209B at T0 = 2023-02-09 22:32:37 s (UTC), reported by Fermi/GBM (GCN #33310, GCN #33324), Swift/BAT (GCN #33315), IPN network (GCN #33323) and Global MASTER-Net (GCN #33311).
The burst is clearly visible in the AGILE scientific ratemeters of the MiniCALorimeter (MCAL; 0.4-100 MeV) and in four out of five panels of the AntiCoincidence system (AC Top, 50-200 keV; AC Lat, 80-200 keV). The event lasted about 6.2 s and it released a total number of 4642 counts in the MCAL detector (above a background rate of 656 Hz), and 25551 counts in the AC Top detector (above a background rate of 3547 Hz). The AGILE ratemeters light curves can be found at: http://www.agilescienceapp.it/notices/GRB230209B_AGILE_RM_ND.png.
The event also triggered a high-time resolution MCAL data acquisition, from T0-4 s to T0+9 s (UTC), and released 2587 counts in the detector, above a background rate of 579.10 Hz. The MCAL light curve can be found at: http://www.agilescienceapp.it/notices/GRB230209B_082193_603066757.789296.png .
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

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Jochen Greiner, last update: 15-Feb-2023 [Disclaimer]