Gamma-ray Burst 230111A

(All information courtesy of the instrument teams.)

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Results of Observations

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Wed 11 Jan 23 19:07:54 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      58
TRIGGER_NUM:     695156867
GRB_RA:          319.083d {+21h 16m 20s} (J2000),
                 319.401d {+21h 17m 36s} (current),
                 318.392d {+21h 13m 34s} (1950)
GRB_DEC:         -15.300d {-15d 18' 00"} (J2000),
                 -15.203d {-15d 12' 09"} (current),
                 -15.509d {-15d 30' 32"} (1950)
GRB_ERROR:       19.87 [deg radius, statistical plus systematic]
GRB_INTEN:       83 [cnts/sec]
DATA_SIGNIF:     7.70 [sigma]
INTEG_TIME:      4.096 [sec]
GRB_DATE:        19955 TJD;    11 DOY;   23/01/11
GRB_TIME:        68862.90 SOD {19:07:42.90} UT
GRB_PHI:          25.00 [deg]
GRB_THETA:        95.00 [deg]
DATA_TIME_SCALE: 4.0960 [sec]
HARD_RATIO:      0.90
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      92%  GRB
2nd_MOST_LIKELY:   3%  Solar Flare
DETECTORS:       0,1,0, 0,0,1, 0,0,0, 0,0,0, 0,0,
SUN_POSTN:       293.02d {+19h 32m 04s}  -21.75d {-21d 45' 00"}
SUN_DIST:         25.83 [deg]   Sun_angle= -1.8 [hr] (East of Sun)
MOON_POSTN:      166.82d {+11h 07m 16s}  +10.20d {+10d 11' 52"}
MOON_DIST:       152.81 [deg]
MOON_ILLUM:      81 [%]
GAL_COORDS:       34.78,-38.87 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      316.80,  0.53 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230111797/quicklook/glg_lc_medres34_bn230111797.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 217.47,24.22 [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 11 Jan 23 19:07:46 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      45
TRIGGER_NUM:     695156867
GRB_RA:          307.483d {+20h 29m 56s} (J2000),
                 307.806d {+20h 31m 14s} (current),
                 306.781d {+20h 27m 07s} (1950)
GRB_DEC:         -15.433d {-15d 25' 59"} (J2000),
                 -15.355d {-15d 21' 17"} (current),
                 -15.601d {-15d 36' 04"} (1950)
GRB_ERROR:       31.88 [deg radius, statistical plus systematic]
GRB_INTEN:       99 [cnts/sec]
DATA_SIGNIF:     4.60 [sigma]
INTEG_TIME:      1.024 [sec]
GRB_DATE:        19955 TJD;    11 DOY;   23/01/11
GRB_TIME:        68862.90 SOD {19:07:42.90} UT
GRB_PHI:          15.00 [deg]
GRB_THETA:        90.00 [deg]
DATA_TIME_SCALE: 1.0240 [sec]
HARD_RATIO:      1.13
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      83%  GRB
2nd_MOST_LIKELY:  12%  Solar Flare
DETECTORS:       0,1,0, 0,0,1, 0,0,0, 0,0,0, 0,0,
SUN_POSTN:       293.02d {+19h 32m 04s}  -21.75d {-21d 45' 00"}
SUN_DIST:         15.40 [deg]   Sun_angle= -1.0 [hr] (East of Sun)
MOON_POSTN:      166.82d {+11h 07m 16s}  +10.20d {+10d 11' 53"}
MOON_DIST:       141.66 [deg]
MOON_ILLUM:      81 [%]
GAL_COORDS:       29.43,-28.61 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      305.99,  3.45 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230111797/quicklook/glg_lc_medres34_bn230111797.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 217.47,24.22 [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 11 Jan 23 19:08:01 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      57
TRIGGER_NUM:     695156867
GRB_RA:          317.860d {+21h 11m 26s} (J2000),
                 318.185d {+21h 12m 44s} (current),
                 317.153d {+21h 08m 37s} (1950)
GRB_DEC:         -19.370d {-19d 22' 11"} (J2000),
                 -19.275d {-19d 16' 28"} (current),
                 -19.575d {-19d 34' 30"} (1950)
GRB_ERROR:       14.61 [deg radius, statistical only]
DATA_SIGNIF:     8.10 [sigma]
DATA_INTERVAL:   4.096 [sec]
GRB_DATE:        19955 TJD;    11 DOY;   23/01/11
GRB_TIME:        68862.90 SOD {19:07:42.90} UT
GRB_PHI:          22.00 [deg]
GRB_THETA:        98.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   4173 (Gnd S/W Version number)
SUN_POSTN:       293.02d {+19h 32m 04s}  -21.75d {-21d 45' 00"}
SUN_DIST:         23.68 [deg]   Sun_angle= -1.7 [hr] (East of Sun)
MOON_POSTN:      166.82d {+11h 07m 17s}  +10.20d {+10d 11' 50"}
MOON_DIST:       150.91 [deg]
MOON_ILLUM:      81 [%]
GAL_COORDS:       29.35,-39.26 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      314.47, -3.01 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230111797/quicklook/glg_lc_medres34_bn230111797.gif
POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_695156867.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:     Wed 11 Jan 23 19:17:05 UT
NOTICE_TYPE:     Fermi-GBM Final Position
RECORD_NUM:      0
TRIGGER_NUM:     695156867
GRB_RA:          316.090d {+21h 04m 22s} (J2000),
                 316.422d {+21h 05m 41s} (current),
                 315.369d {+21h 01m 28s} (1950)
GRB_DEC:         -22.520d {-22d 31' 11"} (J2000),
                 -22.427d {-22d 25' 38"} (current),
                 -22.719d {-22d 43' 09"} (1950)
GRB_ERROR:       8.93 [deg radius, statistical only]
GRB_DATE:        19955 TJD;    11 DOY;   23/01/11
GRB_TIME:        68862.90 SOD {19:07:42.90} UT
GRB_PHI:          19.00 [deg]
GRB_THETA:       100.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   41731 (Gnd S/W Version number)
SUN_POSTN:       293.02d {+19h 32m 06s}  -21.75d {-21d 44' 56"}
SUN_DIST:         21.67 [deg]   Sun_angle= -1.6 [hr] (East of Sun)
MOON_POSTN:      166.89d {+11h 07m 33s}  +10.16d {+10d 09' 52"}
MOON_DIST:       148.38 [deg]
MOON_ILLUM:      80 [%]
GAL_COORDS:       24.83,-38.70 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      311.96, -5.54 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230111797/quicklook/glg_lc_medres34_bn230111797.gif
LOC_URL:         http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230111797/quicklook/glg_locplot_all_bn230111797.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 #33156
The Fermi GBM team reports the detection of a likely LONG GRB
At 19:07:42 UT on 11 Jan 2023, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 230111A (trigger 695156867.898656 / 230111797).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 316.1, Dec = -22.5 (J2000 degrees, equivalent to J2000 21h 04m, -22d 30'), with a statistical uncertainty of 8.9 degrees.
The angle from the Fermi LAT boresight is 100.0 degrees.
The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230111797/quicklook/glg_skymap_all_bn230111797.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/bn230111797/quicklook/glg_healpix_all_bn230111797.fit
The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230111797/quicklook/glg_lc_medres34_bn230111797.gif

GCN Notice

TITLE:           GCN/MAXI NOTICE
NOTICE_DATE:     Wed 11 Jan 23 23:25:53 UT
NOTICE_TYPE:     MAXI Unknown Source Position
EVENT_ID_NUM:      9955641598
EVENT_RA:        320.19d {+21h 20m 45s} (J2000),
                 320.53d {+21h 22m 07s} (current),
                 319.44d {+21h 17m 46s} (1950)
EVENT_DEC:       -30.58d {-30d 34' 36"} (J2000),
                 -30.48d {-30d 28' 41"} (current),
                 -30.79d {-30d 47' 22"} (1950)
EVENT_ERROR:     1.0 [deg radius, stat+sys, 90% containment]
EVENT_FLUX:      230.0 +- 0.0 [mCrab]
EVENT_DATE:      19955 TJD;    11 DOY;   23/01/11
EVENT_TIME:      68864.00 SOD {19:07:44.00} UT
EVENT_TSCALE:    30s
EVENT_EBAND:     Low, 2-4 keV
SUN_POSTN:       293.21d {+19h 32m 51s}  -21.72d {-21d 43' 17"}
SUN_DIST:         25.97 [deg]
MOON_POSTN:      168.78d {+11h 15m 07s}   +9.26d {+09d 15' 38"}
MOON_DIST:       146.19 [deg]
MOON_ILLUM:      79 [%]
GAL_COORDS:       15.52,-44.15 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      313.04,-14.33 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        MAXI Unknown Source Position. GRB or unknown X-ray Transient.

GCN Circular #33157
K. Setoguchi(Kyoto U.), T. Mihara (RIKEN), M. Serino (AGU), H. Negoro, M. Nakajima, K. Kobayashi, M. Tanaka, Y. Soejima (Nihon U.), T. Kawamuro, S. Yamada, T. Tamagawa, M. Matsuoka (RIKEN), T. Sakamoto, S. Sugita, H. Hiramatsu, H. Nishikawa, A. Yoshida (AGU), Y. Tsuboi, J. Kohara, S. Urabe, S. Nawa, N. Nemoto (Chuo U.), M. Shidatsu, M. Iwasaki (Ehime U.), N. Kawai, M. Niwano, R. Hosokawa, Y. Imai, N. Ito, Y. Takamatsu (Tokyo Tech), S. Nakahira, S. Ueno, H. Tomida, M. Ishikawa, T. Kurihara (JAXA), Y. Ueda, S. Ogawa, T. Yoshitake, K. Inaba, Y. Nakatani (Kyoto U.), M. Yamauchi, T. Sato, R. Hatsuda, R. Fukuoka, Y. Hagiwara, Y. Umeki (Miyazaki U.), K. Yamaoka (Nagoya U.), Y. Kawakubo (LSU), 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 19:07:37 UT on 11 Jan 2023. Assuming that the source flux was constant over the transit, we obtain the source position at (R.A., Dec) = (320.188 deg, -30.577 deg) = (21 20 45, -30 34 36) (J2000) with a 90% C.L. statistical error of 0.22 deg and an additional systematic uncertainty of 0.1 deg (90% containment radius). Without assumptions on the source constancy, we obtain a rectangular error box for the transient source with the following corners.
```
(319.214, -30.721) deg = (21 16 51, -30 43 15) (J2000)
(319.406, -31.127) deg = (21 17 37, -31 07 37) (J2000)
(321.653, -30.323) deg = (21 26 36, -30 19 22) (J2000)
(321.454, -29.920) deg = (21 25 48, -29 55 12) (J2000)
```
The X-ray flux averaged over the scan was 230 +- 30 mCrab (4.0-10.0keV, 1 sigma error). There was no significant excess flux in the previous transit at 17:34 UT and in the next transit at 20:40 UT with an upper limit of 20 mCrab for each.
GCN Circular #33162
O.J. Roberts (USRA) and C. Meegan (UAH) report on behalf of the Fermi Gamma-ray Burst Monitor Team:
"At 19:07:42.90 UT on 11 January 2023, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 230111A (trigger 695156867/230111797), which was also detected by MAXI (K. Setoguchi et al. 2023, GCN 33157). The Fermi GBM Localization reported in GCN 33156 is consistent with the MAXI location.
The angle from the Fermi LAT boresight is 108 degrees.
The GBM light curve consists of a single peak with a duration (T90) of about 9 s (50-300 keV). The time-averaged spectrum from T0-3.6 to T0+4.8 s is best fit by a power law function with an exponential high-energy cutoff. The power law index is -0.31 +/- 0.30 and the cutoff energy, parameterized as Epeak, is 122 +/- 16 keV.
The event fluence (10-1000 keV) in this time interval is (1.16 +/- 0.12)E-06 erg/cm^2. The measured 1-s peak photon flux starting from T0-0.9 s in the 10-1000 keV band is 2.6 +/- 0.3 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/"

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Jochen Greiner, last update: 12-Jan-2023 [Disclaimer]