Gamma-ray Burst 250119B

(All information courtesy of the instrument teams.)

Previous IAU Circulars

none

Results of Observations

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Sun 19 Jan 25 08:27:31 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      44
TRIGGER_NUM:     758968026
GRB_RA:          314.283d {+20h 57m 08s} (J2000),
                 314.557d {+20h 58m 14s} (current),
                 313.736d {+20h 54m 57s} (1950)
GRB_DEC:         +25.150d {+25d 08' 60"} (J2000),
                 +25.248d {+25d 14' 51"} (current),
                 +24.957d {+24d 57' 24"} (1950)
GRB_ERROR:       18.37 [deg radius, statistical plus systematic]
GRB_INTEN:       105 [cnts/sec]
DATA_SIGNIF:     6.50 [sigma]
INTEG_TIME:      2.048 [sec]
GRB_DATE:        20694 TJD;    19 DOY;   25/01/19
GRB_TIME:        30421.67 SOD {08:27:01.67} UT
GRB_PHI:          33.00 [deg]
GRB_THETA:       115.00 [deg]
DATA_TIME_SCALE: 2.0480 [sec]
HARD_RATIO:      0.00
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:     100%  Below horizon
2nd_MOST_LIKELY:   0%  n/a
DETECTORS:       0,0,1, 0,0,1, 0,0,0, 0,0,0, 0,0,
SUN_POSTN:       301.67d {+20h 06m 42s}  -20.25d {-20d 14' 56"}
SUN_DIST:         47.19 [deg]   Sun_angle= -0.9 [hr] (East of Sun)
MOON_POSTN:      182.09d {+12h 08m 21s}   -1.28d {-01d 16' 58"}
MOON_DIST:       128.32 [deg]
MOON_ILLUM:      73 [%]
GAL_COORDS:       70.47,-13.08 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      326.05, 40.37 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250119352/quicklook/glg_lc_medres34_bn250119352.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 303.23,12.68 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Sun 19 Jan 25 08:27:47 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      69
TRIGGER_NUM:     758968026
GRB_RA:          301.833d {+20h 07m 20s} (J2000),
                 302.120d {+20h 08m 29s} (current),
                 301.262d {+20h 05m 03s} (1950)
GRB_DEC:         +16.317d {+16d 19' 00"} (J2000),
                 +16.391d {+16d 23' 26"} (current),
                 +16.171d {+16d 10' 16"} (1950)
GRB_ERROR:       11.40 [deg radius, statistical plus systematic]
GRB_INTEN:       158 [cnts/sec]
DATA_SIGNIF:     14.70 [sigma]
INTEG_TIME:      4.096 [sec]
GRB_DATE:        20694 TJD;    19 DOY;   25/01/19
GRB_TIME:        30421.67 SOD {08:27:01.67} UT
GRB_PHI:          31.00 [deg]
GRB_THETA:       100.00 [deg]
DATA_TIME_SCALE: 4.0960 [sec]
HARD_RATIO:      0.77
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      82%  GRB
2nd_MOST_LIKELY:  11%  Cyg X-1
DETECTORS:       0,0,1, 0,0,1, 0,0,0, 0,0,0, 0,0,
SUN_POSTN:       301.68d {+20h 06m 42s}  -20.25d {-20d 14' 56"}
SUN_DIST:         36.64 [deg]   Sun_angle= -0.0 [hr] (East of Sun)
MOON_POSTN:      182.09d {+12h 08m 22s}   -1.28d {-01d 17' 02"}
MOON_DIST:       119.10 [deg]
MOON_ILLUM:      73 [%]
GAL_COORDS:       56.31, -8.60 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      308.50, 35.60 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250119352/quicklook/glg_lc_medres34_bn250119352.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 303.23,12.68 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Sun 19 Jan 25 08:27:40 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      58
TRIGGER_NUM:     758968026
GRB_RA:          309.683d {+20h 38m 44s} (J2000),
                 309.931d {+20h 39m 44s} (current),
                 309.189d {+20h 36m 45s} (1950)
GRB_DEC:         +34.233d {+34d 13' 60"} (J2000),
                 +34.323d {+34d 19' 21"} (current),
                 +34.056d {+34d 03' 23"} (1950)
GRB_ERROR:       14.40 [deg radius, statistical plus systematic]
GRB_INTEN:       123 [cnts/sec]
DATA_SIGNIF:     9.60 [sigma]
INTEG_TIME:      4.096 [sec]
GRB_DATE:        20694 TJD;    19 DOY;   25/01/19
GRB_TIME:        30421.67 SOD {08:27:01.67} UT
GRB_PHI:          44.00 [deg]
GRB_THETA:       115.00 [deg]
DATA_TIME_SCALE: 4.0960 [sec]
HARD_RATIO:      0.71
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      82%  GRB
2nd_MOST_LIKELY:  13%  Cyg X-1
DETECTORS:       0,0,1, 0,0,1, 0,0,0, 0,0,0, 0,0,
SUN_POSTN:       301.68d {+20h 06m 42s}  -20.25d {-20d 14' 56"}
SUN_DIST:         55.13 [deg]   Sun_angle= -0.6 [hr] (East of Sun)
MOON_POSTN:      182.09d {+12h 08m 22s}   -1.28d {-01d 17' 01"}
MOON_DIST:       121.28 [deg]
MOON_ILLUM:      73 [%]
GAL_COORDS:       75.21, -4.33 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      325.71, 50.28 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250119352/quicklook/glg_lc_medres34_bn250119352.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 303.23,12.68 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Sun 19 Jan 25 08:27:56 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      72
TRIGGER_NUM:     758968026
GRB_RA:          302.067d {+20h 08m 16s} (J2000),
                 302.353d {+20h 09m 25s} (current),
                 301.496d {+20h 05m 59s} (1950)
GRB_DEC:         +16.400d {+16d 23' 60"} (J2000),
                 +16.474d {+16d 28' 28"} (current),
                 +16.253d {+16d 15' 12"} (1950)
GRB_ERROR:       6.10 [deg radius, statistical plus systematic]
GRB_INTEN:       390 [cnts/sec]
DATA_SIGNIF:     39.30 [sigma]
INTEG_TIME:      4.096 [sec]
GRB_DATE:        20694 TJD;    19 DOY;   25/01/19
GRB_TIME:        30421.67 SOD {08:27:01.67} UT
GRB_PHI:          31.00 [deg]
GRB_THETA:       100.00 [deg]
DATA_TIME_SCALE: 4.0960 [sec]
HARD_RATIO:      0.68
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      74%  GRB
2nd_MOST_LIKELY:  15%  Cyg X-1
DETECTORS:       0,0,1, 0,0,1, 0,0,0, 0,0,0, 0,0,
SUN_POSTN:       301.68d {+20h 06m 42s}  -20.25d {-20d 14' 55"}
SUN_DIST:         36.73 [deg]   Sun_angle= -0.0 [hr] (East of Sun)
MOON_POSTN:      182.09d {+12h 08m 22s}   -1.28d {-01d 17' 04"}
MOON_DIST:       119.31 [deg]
MOON_ILLUM:      73 [%]
GAL_COORDS:       56.50, -8.75 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      308.80, 35.62 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250119352/quicklook/glg_lc_medres34_bn250119352.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 303.23,12.68 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Sun 19 Jan 25 08:27:50 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      57
TRIGGER_NUM:     758968026
GRB_RA:          324.590d {+21h 38m 22s} (J2000),
                 324.866d {+21h 39m 28s} (current),
                 324.040d {+21h 36m 10s} (1950)
GRB_DEC:         +29.290d {+29d 17' 24"} (J2000),
                 +29.404d {+29d 24' 14"} (current),
                 +29.064d {+29d 03' 50"} (1950)
GRB_ERROR:       9.31 [deg radius, statistical only]
DATA_SIGNIF:     9.00 [sigma]
DATA_INTERVAL:   4.096 [sec]
GRB_DATE:        20694 TJD;    19 DOY;   25/01/19
GRB_TIME:        30421.67 SOD {08:27:01.67} UT
GRB_PHI:          33.00 [deg]
GRB_THETA:       125.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   4173 (Gnd S/W Version number)
SUN_POSTN:       301.68d {+20h 06m 42s}  -20.25d {-20d 14' 56"}
SUN_DIST:         54.45 [deg]   Sun_angle= -1.5 [hr] (East of Sun)
MOON_POSTN:      182.09d {+12h 08m 22s}   -1.28d {-01d 17' 03"}
MOON_DIST:       134.79 [deg]
MOON_ILLUM:      73 [%]
GAL_COORDS:       80.02,-17.07 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      339.27, 40.53 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250119352/quicklook/glg_lc_medres34_bn250119352.gif
POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_758968026.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:     Sun 19 Jan 25 08:28:13 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      94
TRIGGER_NUM:     758968026
GRB_RA:          300.100d {+20h 00m 24s} (J2000),
                 300.375d {+20h 01m 30s} (current),
                 299.551d {+19h 58m 12s} (1950)
GRB_DEC:         +20.900d {+20d 53' 60"} (J2000),
                 +20.970d {+20d 58' 13"} (current),
                 +20.762d {+20d 45' 42"} (1950)
GRB_ERROR:       4.78 [deg radius, statistical plus systematic]
GRB_INTEN:       637 [cnts/sec]
DATA_SIGNIF:     63.00 [sigma]
INTEG_TIME:      4.096 [sec]
GRB_DATE:        20694 TJD;    19 DOY;   25/01/19
GRB_TIME:        30421.67 SOD {08:27:01.67} UT
GRB_PHI:          36.00 [deg]
GRB_THETA:       100.00 [deg]
DATA_TIME_SCALE: 4.0960 [sec]
HARD_RATIO:      0.76
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      71%  GRB
2nd_MOST_LIKELY:  20%  Cyg X-1
DETECTORS:       0,0,1, 0,0,1, 0,0,0, 0,0,0, 0,0,
SUN_POSTN:       301.68d {+20h 06m 42s}  -20.25d {-20d 14' 55"}
SUN_DIST:         41.24 [deg]   Sun_angle= 0.1 [hr] (West of Sun)
MOON_POSTN:      182.09d {+12h 08m 22s}   -1.29d {-01d 17' 08"}
MOON_DIST:       116.77 [deg]
MOON_ILLUM:      73 [%]
GAL_COORDS:       59.38, -4.80 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      308.00, 40.45 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250119352/quicklook/glg_lc_medres34_bn250119352.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 303.23,12.68 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Sun 19 Jan 25 08:28:52 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      0
TRIGGER_NUM:     758968026
GRB_RA:          310.530d {+20h 42m 07s} (J2000),
                 310.805d {+20h 43m 13s} (current),
                 309.981d {+20h 39m 55s} (1950)
GRB_DEC:         +23.350d {+23d 21' 00"} (J2000),
                 +23.441d {+23d 26' 27"} (current),
                 +23.170d {+23d 10' 12"} (1950)
GRB_ERROR:       6.10 [deg radius, statistical only]
DATA_SIGNIF:     16.40 [sigma]
DATA_INTERVAL:   9.216 [sec]
GRB_DATE:        20694 TJD;    19 DOY;   25/01/19
GRB_TIME:        30421.67 SOD {08:27:01.67} UT
GRB_PHI:          33.00 [deg]
GRB_THETA:       111.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   41731 (Gnd S/W Version number)
SUN_POSTN:       301.68d {+20h 06m 42s}  -20.25d {-20d 14' 55"}
SUN_DIST:         44.59 [deg]   Sun_angle= -0.6 [hr] (East of Sun)
MOON_POSTN:      182.10d {+12h 08m 24s}   -1.29d {-01d 17' 18"}
MOON_DIST:       125.63 [deg]
MOON_ILLUM:      73 [%]
GAL_COORDS:       66.87,-11.46 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      321.03, 39.88 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250119352/quicklook/glg_lc_medres34_bn250119352.gif
POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_758968026.fits
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        This is likely a Long GRB.  
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.  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(1.0<100sec) coincident with the INTEGRAL_SPIACS event (trignum=11033).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Sun 19 Jan 25 08:29:04 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      1
TRIGGER_NUM:     758968026
GRB_RA:          309.660d {+20h 38m 38s} (J2000),
                 309.936d {+20h 39m 45s} (current),
                 309.110d {+20h 36m 26s} (1950)
GRB_DEC:         +22.900d {+22d 53' 60"} (J2000),
                 +22.989d {+22d 59' 21"} (current),
                 +22.723d {+22d 43' 24"} (1950)
GRB_ERROR:       4.09 [deg radius, statistical only]
DATA_SIGNIF:     20.80 [sigma]
DATA_INTERVAL:   13.312 [sec]
GRB_DATE:        20694 TJD;    19 DOY;   25/01/19
GRB_TIME:        30421.67 SOD {08:27:01.67} UT
GRB_PHI:          33.00 [deg]
GRB_THETA:       110.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   41731 (Gnd S/W Version number)
SUN_POSTN:       301.68d {+20h 06m 42s}  -20.25d {-20d 14' 55"}
SUN_DIST:         43.98 [deg]   Sun_angle= -0.6 [hr] (East of Sun)
MOON_POSTN:      182.10d {+12h 08m 24s}   -1.29d {-01d 17' 21"}
MOON_DIST:       124.98 [deg]
MOON_ILLUM:      73 [%]
GAL_COORDS:       66.02,-11.08 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      319.86, 39.73 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250119352/quicklook/glg_lc_medres34_bn250119352.gif
POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_758968026.fits
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        This is likely a Long GRB.  
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.  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(1.0<100sec) coincident with the INTEGRAL_SPIACS event (trignum=11033).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Sun 19 Jan 25 08:29:14 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      2
TRIGGER_NUM:     758968026
GRB_RA:          309.780d {+20h 39m 07s} (J2000),
                 310.060d {+20h 40m 14s} (current),
                 309.221d {+20h 36m 53s} (1950)
GRB_DEC:         +20.790d {+20d 47' 24"} (J2000),
                 +20.879d {+20d 52' 46"} (current),
                 +20.613d {+20d 36' 46"} (1950)
GRB_ERROR:       3.07 [deg radius, statistical only]
DATA_SIGNIF:     28.40 [sigma]
DATA_INTERVAL:   17.408 [sec]
GRB_DATE:        20694 TJD;    19 DOY;   25/01/19
GRB_TIME:        30421.67 SOD {08:27:01.67} UT
GRB_PHI:          31.00 [deg]
GRB_THETA:       109.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   41731 (Gnd S/W Version number)
SUN_POSTN:       301.68d {+20h 06m 42s}  -20.25d {-20d 14' 55"}
SUN_DIST:         41.94 [deg]   Sun_angle= -0.6 [hr] (East of Sun)
MOON_POSTN:      182.10d {+12h 08m 24s}   -1.29d {-01d 17' 23"}
MOON_DIST:       125.63 [deg]
MOON_ILLUM:      73 [%]
GAL_COORDS:       64.34,-12.41 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      319.11, 37.69 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250119352/quicklook/glg_lc_medres34_bn250119352.gif
POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_758968026.fits
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        This is likely a Long GRB.  
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.  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(1.0<100sec) coincident with the INTEGRAL_SPIACS event (trignum=11033).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Sun 19 Jan 25 08:29:24 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      3
TRIGGER_NUM:     758968026
GRB_RA:          308.870d {+20h 35m 29s} (J2000),
                 309.151d {+20h 36m 36s} (current),
                 308.310d {+20h 33m 14s} (1950)
GRB_DEC:         +20.310d {+20d 18' 36"} (J2000),
                 +20.398d {+20d 23' 52"} (current),
                 +20.136d {+20d 08' 11"} (1950)
GRB_ERROR:       2.38 [deg radius, statistical only]
DATA_SIGNIF:     32.20 [sigma]
DATA_INTERVAL:   18.432 [sec]
GRB_DATE:        20694 TJD;    19 DOY;   25/01/19
GRB_TIME:        30421.67 SOD {08:27:01.67} UT
GRB_PHI:          31.00 [deg]
GRB_THETA:       108.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   41731 (Gnd S/W Version number)
SUN_POSTN:       301.68d {+20h 06m 42s}  -20.25d {-20d 14' 55"}
SUN_DIST:         41.30 [deg]   Sun_angle= -0.5 [hr] (East of Sun)
MOON_POSTN:      182.10d {+12h 08m 25s}   -1.29d {-01d 17' 25"}
MOON_DIST:       124.92 [deg]
MOON_ILLUM:      73 [%]
GAL_COORDS:       63.43,-11.99 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      317.90, 37.51 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250119352/quicklook/glg_lc_medres34_bn250119352.gif
POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_758968026.fits
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        This is likely a Long GRB.  
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.  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(1.0<100sec) coincident with the INTEGRAL_SPIACS event (trignum=11033).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Sun 19 Jan 25 08:36:20 UT
NOTICE_TYPE:     Fermi-GBM Final Position
RECORD_NUM:      0
TRIGGER_NUM:     758968026
GRB_RA:          306.740d {+20h 26m 58s} (J2000),
                 307.018d {+20h 28m 04s} (current),
                 306.186d {+20h 24m 45s} (1950)
GRB_DEC:         +21.230d {+21d 13' 48"} (J2000),
                 +21.314d {+21d 18' 49"} (current),
                 +21.065d {+21d 03' 52"} (1950)
GRB_ERROR:       1.00 [deg radius, statistical only]
GRB_DATE:        20694 TJD;    19 DOY;   25/01/19
GRB_TIME:        30421.67 SOD {08:27:01.67} UT
GRB_PHI:          33.00 [deg]
GRB_THETA:       106.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   41731 (Gnd S/W Version number)
SUN_POSTN:       301.68d {+20h 06m 44s}  -20.25d {-20d 14' 51"}
SUN_DIST:         41.89 [deg]   Sun_angle= -0.4 [hr] (East of Sun)
MOON_POSTN:      182.15d {+12h 08m 37s}   -1.32d {-01d 19' 04"}
MOON_DIST:       122.74 [deg]
MOON_ILLUM:      73 [%]
GAL_COORDS:       63.05, -9.83 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      315.85, 39.00 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250119352/quicklook/glg_lc_medres34_bn250119352.gif
LOC_URL:         http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250119352/quicklook/glg_locplot_all_bn250119352.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=11033).

GCN Circular #38979
The Fermi GBM team reports the detection of a likely LONG GRB
At 08:27:01 UT on 19 Jan 2025, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 250119B (trigger 758968026.673982 / 250119352).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 306.7, Dec = 21.2 (J2000 degrees, equivalent to J2000 20h 26m, 21d 11'), with a statistical uncertainty of 1.0 degrees.
The angle from the Fermi LAT boresight is 106.0 degrees.
The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250119352/quicklook/glg_skymap_all_bn250119352.png
The HEALPix FITS file, including the estimated localization systematic, can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250119352/quicklook/glg_healpix_all_bn250119352.fit
The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250119352/quicklook/glg_lc_medres34_bn250119352.gif
GCN Circular #38980
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 758968026 at 08:27:01 on 19 Jan. 2025 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 is:
```
RA(2000.0) = 306.3 deg
Decl.(2000.0) = 19.3 deg
```
The 1 sigma statistical error radius is 1.8 deg. We estimate an additional systematic error of 1 deg.
Further details are available at: https://grb.mpe.mpg.de/grb/GRB250119352/
The Healpix map can be downloaded from: https://grb.mpe.mpg.de/grb/GRB250119352/healpix
The location parameters are available as JSON at: https://grb.mpe.mpg.de/grb/GRB250119352/json
GCN Circular #38997
Patrizia Barria(a,b), Giulia Gianfagna(a), James Craig Rodi(a), Aishwarya Linesh Thakur(a), Luigi Piro(a), Lorenzo Natalucci(a,b) report:
GRB 250119B was discovered by Fermi/GBM (GCN 38979, 38980) at time 2025-01-16T08:27:01 (UTC). We searched for any corresponding counterpart in the INTEGRAL/SPI-ACS data.
In a SPI-ACS light curve above 80 keV we find a signal temporally coincident with the GBM detection having an approximate duration of ~ 60 sec.The signal consists of several pulses over this duration.
The approximate peak count rate in SPI-ACS is 90,000 cts/s for E>80 keV, over a median background rate of 65,400 cts/s.
This work is based on observations with INTEGRAL, an ESA project with instruments and a science data centre funded by ESA member states (especially the PI countries: Denmark, France, Germany, Italy, Switzerland, and Spain), and with the participation of Russia and the USA. The SPI-ACS detector system has been provided by MPE Garching/Germany.
-----
(a) INAF/IAPS-Rome
(b) ICSC National Research Centre for High-Performance Computing
GCN Circular #39003
U. Pathak (IITB), R. Sonawane (IISER, TVM), and C. Meegan (UAH) report on behalf of the Fermi Gamma-ray Burst Monitor Team:
"At 08:27:01.67 UT on 19 January 2025, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 250119B (trigger 758968026/250119352) which was also detected by INTEGRAL/SPI-ACS (Barria et al. 2025, GCN 38997).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 306.74, Dec = 21.23 (J2000 degrees, equivalent to J2000 20h 26m, +21d 13'), with a statistical uncertainty of 1.00 degrees. (radius, 1-sigma containment, statistical only; there is additionally a systematic error which we have characterized as a mixture of two Gaussians, one with a radius of 1.8 degrees (52% contribution) and one with a radius of 4.1 degrees (47% contribution) [A. Goldstein et al. 2020, ApJ, 895, 1]).
The angle from the Fermi LAT boresight is 106 degrees.
The GBM light curve consists of two emission episodes with multiple spikes for a duration (T90) of about 255.5 s (50-300 keV). The time-averaged spectrum from T0-4 to T0+300 s is best fit by a Band function with Epeak = 297 +/- 14 keV, alpha = -0.98 +/- 0.02, and beta = -2.6 +/- 0.2.
The event fluence (10-1000 keV) in this time interval is (9.2 +/- 0.1)E-05 erg/cm^2. The 1-sec peak photon flux measured starting from T0+44 s in the 10-1000 keV band is 17.6 +/- 0.4 ph/s/cm^2.
A power law function with an exponential high-energy cutoff fits the spectrum equally well with Epeak= 314 +/- 11 keV, and alpha = -0.99 +/- 0.02.
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 #39007
Samuele Ronchini (PSU), James DeLaunay (PSU), Aaron Tohuvavohu (Caltech), Gayathri Raman (PSU), Jamie A. Kennea (PSU), Tyler Parsotan (NASA GSFC) report:
Swift/BAT did not localize GRB 250119B onboard (T0: 2025-01-19T08:27:02.72 UTC, Fermi GCN 38979, BALROG GCN 38980, INTEGRAL GCN 38997)
The Fermi 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 BAT likelihood search, NITRATES (DeLaunay + Tohuvavohu 2022, ApJ, 941, 169), performed on the temporal window [T0-20 s, T0+20 s], detects the burst with a sqrt(TS) of 32.6 in a 8.192 s analysis time bin, starting at T0+16.3844 s.
Using the NITRATES analysis, parameter estimation was performed to obtain the localization of this burst in the form of a HEALPIX Multi-Order Coverage (MOC) skymap. This localization accounts for both statistical and systematic errors. More details in the creation and calibration of these maps will soon be published (DeLaunay et al. 2025. in prep)
The 90% credible area is 82 deg2 and the 50% credible area is 25 deg2. The integrated probability inside the coded field of view is 1%.
The NITRATES skymap is consistent with the Fermi and BALROG localizations.
A plot of the probability skymap can be viewed here:
[skymap_plot](https://guano.swift.psu.edu/trigger_report?id=758968057/#:~:text=Probability%20Skymap)
The probability skymap file can be downloaded from the link here
[skymap_fits_file](https://guano.swift.psu.edu/files/758968057/0_n_PROBMAP)
Instructions on how to read and manipulate this map can be found here:
https://guano.swift.psu.edu/documentation
More details about this burst can be found on the trigger report page here:
https://guano.swift.psu.edu/trigger_report?id=758968057
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 #39015
A.S. Kozyrev, D.V. Golovin, M.L. Litvak, I.G. Mitrofanov, and A.B. Sanin on behalf of the HEND/Mars Odyssey team,
D. Svinkin, D. Frederiks, A. Lysenko, A. Ridnaia, 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 bright, long-duration GRB 250119B (Fermi-GBM detection: The Fermi GBM team, GCN 38979; BALROG localization: Preis et al., GCN 38980; INTEGRAL-SPI-ACS detection: Barria et al., GCN 38997; Swift-BAT/GUANO detection: Ronchini et al., 39007) was detected by Fermi (GBM trigger 758968026), Konus-Wind, INTEGRAL (SPI-ACS), Swift (BAT), and Mars-Odyssey (HEND) at about 30421 s UT (08:27:01). The burst was outside the coded field of view of the BAT.
We have triangulated it to a preliminary, 3 sigma error box whose coordinates are:
```
 ---------------------------------------------
  RA(2000), deg                 Dec(2000), deg
 ---------------------------------------------
 Center:
  304.147 (20h 16m 35s) +22.039 (+22d 02' 20")
 Corners:
  308.304 (20h 33m 13s) +21.164 (+21d 09' 51")
  307.706 (20h 30m 49s) +21.495 (+21d 29' 42")
  299.904 (19h 59m 37s) +22.564 (+22d 33' 49")
  300.555 (20h 02m 13s) +22.329 (+22d 19' 46")
 ---------------------------------------------
```
The error box area is 1.4 sq. deg, and its maximum dimension is 7.9 deg (the minimum one is 11.5 arcmin). The Sun distance was 42 deg.
This localization may be improved.
The IPN localization is consistent with, but reduces the area of, the Fermi-GBM/RoboBA (GCN 38979), BALROG (GCN 38980), and Swift-BAT/GUANO (GCN 39007) localizations.
The burst lightcurve shows two separate emission episodes at ~T0(KW) and at ~T0(KW)+250 s. The IPN localization of the second emission episode is consistent with the first one.
A triangulation map and HEALPix FITS file are posted at http://www.ioffe.ru/LEA/GRBs/GRB250119_T30434/IPN The HEALPix triangulation map is the multi-order HEALPix in units of probability density.
The Konus-Wind time history and spectrum will be given in a forthcoming GCN Circular.
GCN Circular #39016
A. Ridnaia, D. Frederiks, A. Lysenko, D. Svinkin, A. Tsvetkova, M. Ulanov, and T. Cline, on behalf of the Konus-Wind team, report:
The long-duration GRB 250119B (Fermi-GBM detection: Fermi GBM team, GCN 38979; Preis et al., GCN 38980; Pathak et al., GCN 39003; INTEGRAL/SPI-ACS detection: Barria et al., GCN 38997; Swift-BAT/GUANO detection: Ronchini et al., 39007 IPN triangulation: Kozyrev et al., GCN 39015) triggered Konus-Wind at T0=30434.631 s UT (08:27:14.631).
The burst light curve shows two separated multipeaked emission episodes. The first episode starts at ~T0-18.6 s and has a total duration of ~162 s, the second starts at ~T0+233 s and lasts up to ~T0+274 s. The emission is seen up to ~3 MeV.
The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB250119_T30434/
As observed by Konus-Wind, the burst had a fluence of 1.36(-0.16,+0.16)x10^-4 erg/cm2, and a 64-ms peak flux, measured from T0+31.440 s, of 9.43(-1.10,+1.11)x10^-6 erg/cm2/s (both in the 20 keV - 10 MeV energy range).
The time-averaged spectrum of the burst (measured from T0 to T0+273.664 s) is best fit in the 20 keV - 10 MeV range by the GRB (Band) model with the following parameters: the low-energy photon index alpha = -1.02(-0.08,+0.09), the high energy photon index beta = -2.37(-0.35,+0.19), the peak energy Ep = 332(-36,+43) keV (chi2 = 95/96 dof).
The spectrum near the maximum count rate (measured from T0+29.184 to T0+36.096 s) is best fit in the 20 keV - 10 MeV range by the GRB (Band) model with the following parameters: the low-energy photon index alpha = -0.64(-0.08,+0.09), the high energy photon index beta = -2.43(-0.17,+0.12), the peak energy Ep = 297(-20,+23) keV (chi2 = 85/79 dof).
All the quoted errors are at the 68% confidence level. All the quoted values are preliminary.
GCN Circular #39460
M. Dafcikova, J. Ripa (Masaryk U.), A. Pal (Konkoly Observatory), N. Werner (Masaryk U.), M. Ohno (Hiroshima U.), L. Meszaros, B. Csak (Konkoly Observatory), H. Takahashi (Hiroshima U.), F. Munz , M. Topinka, F. Hroch, N. Husarikova, J.-P. Breuer (Masaryk U.), J. Hudec, J. Kapus, M. Frajt, M. Rezenov (Spacemanic s.r.o), R. Laszlo (Needronix), G. Galgoczi (Wigner Research Center/Eotvos U.), N. Uchida (ISAS/JAXA), T. Enoto (Kyoto U.), Zs. Frei (Eotvos U.), Y. Fukazawa, K. Hirose, H. Matake (Hiroshima U.), S. Hisadomi (Nagoya U.), Y. Ichinohe (Rikkyo U.), L. L. Kiss (Konkoly Observatory), T. Mizuno (Hiroshima U.), K. Nakazawa (Nagoya U.), H. Odaka (Univ of Tokyo), K. Torigoe (Hiroshima U.), P. Svoboda, V. Daniel, J. Dudas, M. Junas, J. Gromes (VZLU), I. Vertat (FEL ZCU) -- the VZLUSAT-2/GRB payload collaboration.
The long-duration GRB 250119B (FERMI/GBM detection: GCN 38979; INTEGRAL/SPI-ACS detection: GCN Circular 38997; Swift/BAT-GUANO detection: GCN 39007; Konus/Wind detection: GCN 39016; NuSTAR detection at 2025-01-19 08:27:23 UTC) was detected by the GRB detector on board of the VZLUSAT-2 3U CubeSat (https://www.vzlusat2.cz/en/).
The data acquisition was performed by the GRB detector unit no. 1. The detection was confirmed at the peak time 2025-01-19 08:27:44 UTC. The T90 duration is 41 s and the significance during T90 reaches 66 sigma.
The light curve obtained by VZLUSAT-2 is available here: https://vzlusat2.konkoly.hu/static/share/GRB250119B_GCN_VZLUSAT2.pdf
All VZLUSAT-2 detections are listed at: https://monoceros.physics.muni.cz/hea/VZLUSAT-2/ The GRB detectors on VZLUSAT-2 are a demonstration payload for a future CubeSat constellation (Werner et al. Proc. SPIE 2018). Two GRB modules of VZLUSAT-2 are placed in a perpendicular manner and each consists of a 75 x 75 x 5 mm3 CsI scintillator read out by a SiPM array, covering the energy range from ~30 keV to ~1000 keV. VZLUSAT-2 was launched on 2022 January 13 from Cape Canaveral.

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