Gamma-ray Burst 221206B

(All information courtesy of the instrument teams.)

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Results of Observations

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Tue 06 Dec 22 12:23:16 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      44
TRIGGER_NUM:     692022172
GRB_RA:          246.983d {+16h 27m 56s} (J2000),
                 247.144d {+16h 28m 35s} (current),
                 246.634d {+16h 26m 32s} (1950)
GRB_DEC:         +48.617d {+48d 37' 00"} (J2000),
                 +48.567d {+48d 34' 01"} (current),
                 +48.726d {+48d 43' 35"} (1950)
GRB_ERROR:       4.73 [deg radius, statistical plus systematic]
GRB_INTEN:       1350 [cnts/sec]
DATA_SIGNIF:     30.60 [sigma]
INTEG_TIME:      1.024 [sec]
GRB_DATE:        19919 TJD;   340 DOY;   22/12/06
GRB_TIME:        44567.36 SOD {12:22:47.36} UT
GRB_PHI:          68.00 [deg]
GRB_THETA:       125.00 [deg]
DATA_TIME_SCALE: 1.0240 [sec]
HARD_RATIO:      0.48
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      89%  GRB
2nd_MOST_LIKELY:   5%  Distant Particles
DETECTORS:       1,0,1, 0,0,0, 0,0,0, 0,0,0, 0,0,
SUN_POSTN:       253.03d {+16h 52m 07s}  -22.52d {-22d 31' 06"}
SUN_DIST:         71.28 [deg]   Sun_angle= 0.4 [hr] (West of Sun)
MOON_POSTN:       52.98d {+03h 31m 55s}  +20.32d {+20d 19' 13"}
MOON_DIST:       109.96 [deg]
MOON_ILLUM:      97 [%]
GAL_COORDS:       75.45, 43.39 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      225.15, 68.50 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2022/bn221206516/quicklook/glg_lc_medres34_bn221206516.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 226.00,21.20 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Tue 06 Dec 22 12:23:26 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      59
TRIGGER_NUM:     692022172
GRB_RA:          247.083d {+16h 28m 20s} (J2000),
                 247.243d {+16h 28m 58s} (current),
                 246.735d {+16h 26m 56s} (1950)
GRB_DEC:         +48.667d {+48d 40' 00"} (J2000),
                 +48.617d {+48d 37' 02"} (current),
                 +48.776d {+48d 46' 33"} (1950)
GRB_ERROR:       4.10 [deg radius, statistical plus systematic]
GRB_INTEN:       1233 [cnts/sec]
DATA_SIGNIF:     58.60 [sigma]
INTEG_TIME:      4.096 [sec]
GRB_DATE:        19919 TJD;   340 DOY;   22/12/06
GRB_TIME:        44567.36 SOD {12:22:47.36} UT
GRB_PHI:          68.00 [deg]
GRB_THETA:       125.00 [deg]
DATA_TIME_SCALE: 4.0960 [sec]
HARD_RATIO:      0.56
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      90%  GRB
2nd_MOST_LIKELY:   5%  Distant Particles
DETECTORS:       1,0,1, 0,0,0, 0,0,0, 0,0,0, 0,0,
SUN_POSTN:       253.03d {+16h 52m 07s}  -22.52d {-22d 31' 07"}
SUN_DIST:         71.32 [deg]   Sun_angle= 0.4 [hr] (West of Sun)
MOON_POSTN:       52.98d {+03h 31m 55s}  +20.32d {+20d 19' 15"}
MOON_DIST:       109.89 [deg]
MOON_ILLUM:      97 [%]
GAL_COORDS:       75.50, 43.32 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      225.25, 68.57 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2022/bn221206516/quicklook/glg_lc_medres34_bn221206516.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 226.00,21.20 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Tue 06 Dec 22 12:23:35 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      58
TRIGGER_NUM:     692022172
GRB_RA:          256.690d {+17h 06m 46s} (J2000),
                 256.864d {+17h 07m 27s} (current),
                 256.312d {+17h 05m 15s} (1950)
GRB_DEC:         +44.050d {+44d 02' 60"} (J2000),
                 +44.021d {+44d 01' 15"} (current),
                 +44.115d {+44d 06' 54"} (1950)
GRB_ERROR:       1.27 [deg radius, statistical only]
DATA_SIGNIF:     119.70 [sigma]
DATA_INTERVAL:   4.096 [sec]
GRB_DATE:        19919 TJD;   340 DOY;   22/12/06
GRB_TIME:        44567.36 SOD {12:22:47.36} UT
GRB_PHI:          60.00 [deg]
GRB_THETA:       130.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   4173 (Gnd S/W Version number)
SUN_POSTN:       253.03d {+16h 52m 07s}  -22.52d {-22d 31' 07"}
SUN_DIST:         66.63 [deg]   Sun_angle= -0.3 [hr] (East of Sun)
MOON_POSTN:       52.98d {+03h 31m 56s}  +20.32d {+20d 19' 16"}
MOON_DIST:       112.04 [deg]
MOON_ILLUM:      97 [%]
GAL_COORDS:       69.26, 36.81 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      245.62, 66.37 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2022/bn221206516/quicklook/glg_lc_medres34_bn221206516.gif
POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_692022172.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:     Tue 06 Dec 22 12:32:05 UT
NOTICE_TYPE:     Fermi-GBM Final Position
RECORD_NUM:      0
TRIGGER_NUM:     692022172
GRB_RA:          255.090d {+17h 00m 22s} (J2000),
                 255.263d {+17h 01m 03s} (current),
                 254.714d {+16h 58m 51s} (1950)
GRB_DEC:         +44.520d {+44d 31' 12"} (J2000),
                 +44.487d {+44d 29' 14"} (current),
                 +44.593d {+44d 35' 33"} (1950)
GRB_ERROR:       1.02 [deg radius, statistical only]
GRB_DATE:        19919 TJD;   340 DOY;   22/12/06
GRB_TIME:        44567.36 SOD {12:22:47.36} UT
GRB_PHI:          61.00 [deg]
GRB_THETA:       129.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   41731 (Gnd S/W Version number)
SUN_POSTN:       253.04d {+16h 52m 09s}  -22.52d {-22d 31' 09"}
SUN_DIST:         67.04 [deg]   Sun_angle= -0.1 [hr] (East of Sun)
MOON_POSTN:       53.06d {+03h 32m 14s}  +20.35d {+20d 20' 42"}
MOON_DIST:       112.06 [deg]
MOON_ILLUM:      97 [%]
GAL_COORDS:       69.77, 37.98 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      242.55, 66.54 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2022/bn221206516/quicklook/glg_lc_medres34_bn221206516.gif
LOC_URL:         http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2022/bn221206516/quicklook/glg_locplot_all_bn221206516.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.

GCN Circular #33023
The Fermi GBM team reports the detection of a likely LONG GRB
At 12:22:47 UT on 6 Dec 2022, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 221206B (trigger 692022172.359134 / 221206516).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 255.1, Dec = 44.5 (J2000 degrees, equivalent to J2000 17h 00m, 44d 30'), with a statistical uncertainty of 1.0 degrees.
The angle from the Fermi LAT boresight is 129.0 degrees.
The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2022/bn221206516/quicklook/glg_skymap_all_bn221206516.png
The HEALPix FITS file, including the estimated localization systematic, can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2022/bn221206516/quicklook/glg_healpix_all_bn221206516.fit
The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2022/bn221206516/quicklook/glg_lc_medres34_bn221206516.gif
GCN Circular #33026
P. A. Evans (U. Leicester) reports on behalf of the Swift team:
Swift has initiated a ToO observation of the Swift/BAT-GUANO GRB 221206B. Automated analysis of the XRT data will be presented online at https://www.swift.ac.uk/ToO_GRBs/00021532
Any uncatalogued X-ray sources detected in this analysis will be reported on this website and via GCN COUNTERPART notices. These are not necessarily related to the Swift/BAT-GUANO event. Any X-ray source considered to be a probable afterglow candidate will be reported via a GCN Circular after manual consideration.
Details of the XRT automated analysis methods are detailed in Evans et al. (2007, A&A, 469, 379; 2009, MNRAS, 397, 1177 and 2014, ApJS, 210, 8).
This circular is an official product of the Swift-XRT team.
GCN Circular #33027
James DeLaunay (U Alabama), Aaron Tohuvavohu (U Toronto), Jamie A. Kennea (PSU), Gayathri Raman (PSU), report:
Swift/BAT did not trigger on GRB 221206 (T0: 2022-12-06T12:22:47 UTC, Fermi/GBM GCN 33023).
The Fermi/GBM notice, 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 burst is detected in BAT with a duration of ~12 seconds. The burst occurred during a Swift slew. A candidate location for the burst was found with an SNR of 6.6.
The BAT position is RA, Dec = 251.155, +42.671 deg which is
```
   RA(J2000)  = 16h 44m 37.13s
   Dec(J2000) =  +42d 40′ 17.0″
```
with an estimated uncertainty of 4 arcmin.
This position is consistent with the Ferm/GBM localization (GCN 33023). XRT and UVOT follow-up has been requested. Results of follow-up observations will be reported in future circulars.
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 #33028
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= =2E), Y. Ichinohe (Rikkyo U.), K. Kapas (Eotvos U.), L. L. Kiss (Konkoly Ob= servatory), T. Mizuno (Hiroshima U.), K. Nakazawa (Nagoya U.), H. Odaka (U= niv of Tokyo), J. Takatsy (Eotvos U.), K. Torigoe (Hiroshima U.), N. Kogiso= , M. Yoneyama (Os aka Metropolitan U.), M. Moritaki (U. Tokyo), T. Kano (U. Michigan) -- the= GRBAlpha collaboration.
The long-duration GRB 221206B (Fermi/GBM detection: GCN Circ. 33023; Swift/= BAT-GUANO detection: GCN Circ. 33027; Konus/Wind detection, trigger time at= 2022-12-06 12:22:46.185 UT; INTEGRAL/SPI-ACS detection, peak time at ~2022= -12-06 12:22:49 UT) was observed by the GRBAlpha 1U CubeSat (Pal et al. Pro= c. SPIE 2020).
The detection was confirmed at the peak time 2022-12-06 12:22:49 UTC. The l= ight curve observed by GRBAlpha shows a double-peak structure with a T90 du= ration of 8 s. The SNR during T90 reaches 36.
The light curve obtained by GRBAlpha is available here: https://grbalpha.konkoly.hu/static/share/GRB221206B_GCN.pdf
GRBAlpha is a demonstration mission for a future CubeSats constellation (We= rner et al. Proc. SPIE 2018). The detector of GRBAlpha consists of a 75 x 7= 5 x 5 mm3 CsI scintillator read out by a SiPM array, covering the energy ra= nge from ~50 keV to ~1000 keV. GRBAlpha was launched on 2021 March 22 from = Baikonur. After its commissioning phase, the scientific observations are no= w under way. 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 advan= tage of the SatNOGS network for increased data downlink volume.
GCN Circular #33029
J.P. Osborne (U. Leicester), K.L. Page (U. Leicester), P. D'Avanzo (INAF-OAB), M.G. Bernardini (INAF-OAB), E. Ambrosi (INAF-IASFPA) , D.N. Burrows (PSU), J. D. Gropp (PSU), S. Dichiara (PSU), A.P. Beardmore (U. Leicester) and P.A. Evans (U. Leicester) report on behalf of the Swift-XRT team:
Swift-XRT has performed follow-up observations of the Swift/BAT-GUANO-detected burst GRB 221206B, collecting 4.8 ks of Photon Counting (PC) mode data between T0+28.7 ks and T0+45.0 ks.
No X-ray sources have been detected within the Swift/BAT-GUANO error circle. The 3-sigma upper limit in the field ranges from ~0.002 to ~0.003 ct s^-1, corresponding to a 0.3-10 keV observed flux of 7.7e-14 to 1.0e-13 erg cm^-2 s^-1 (assuming a typical GRB spectrum).
Five uncatalogued sources were detected too far from the GRB position to be likely afterglow candidates.
The results of the XRT-team automatic analysis of the XRT observations, including a position-specific upper limit calculator, are available at https://www.swift.ac.uk/ToO_GRBs/00021532.
This circular is an official product of the Swift-XRT team.
GCN Circular #33030
C. Malacaria (ISSI) and C. Meegan (UAH) report on behalf of the Fermi GBM Team: "At 12:22:47.36 UT on 06 December 2022, the Fermi Gamma-Ray Burst Monitor (GBM) triggered and located GRB 221206B (trigger 692022172 / 221206516). The GBM Final Real-time Localization was reported in GCN 33023. The event was also detected by the Swift/BAT-GUANO (DeLaunay et al. 2022, GCN 33027) at a consistent position. The angle from the Fermi LAT boresight at the GBM trigger time is 121 degrees. The GBM light curve consists of two main peaks with a duration (T90) of about 8 s (50-300 keV). The time-averaged spectrum from T0-0 s to T0+5.9 s is best fit by a Band function with Epeak = 151 +/- 6 keV, alpha = -0.36 +/- 0.06, and beta = -3.1 +/- 0.2 The event fluence (10-1000 keV) in this time interval is (2.19 +/- 0.05)E-06 erg/cm^2. The 1-sec peak photon flux measured starting from T0+7.5 s in the 10-1000 keV band is 26.7 +/- 0.7 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 <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/ <https://fermi.gsfc.nasa.gov/ssc/data/access/gbm/>"

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