Gamma-ray Burst 250207A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

none

Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 07 Feb 25 01:16:21 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     1287821,   Seg_Num: 0
GRB_RA:           16.115d {+01h 04m 28s} (J2000),
                  16.428d {+01h 05m 43s} (current),
                  15.491d {+01h 01m 58s} (1950)
GRB_DEC:         -12.159d {-12d 09' 30"} (J2000),
                 -12.025d {-12d 01' 27"} (current),
                 -12.427d {-12d 25' 35"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       3739 [cnts]    Image_Peak=345 [image_cnts]
TRIGGER_DUR:     1.024 [sec] 
TRIGGER_INDEX:   146     E_range: 25-100 keV
BKG_INTEN:       16181 [cnts]
BKG_TIME:        4548.96 SOD {01:15:48.96} UT
BKG_DUR:         8 [sec]
GRB_DATE:        20713 TJD;    38 DOY;   25/02/07
GRB_TIME:        4567.33 SOD {01:16:07.33} UT
GRB_PHI:         -171.20 [deg]
GRB_THETA:        35.41 [deg]
SOLN_STATUS:     0x20000003
RATE_SIGNIF:     34.52 [sigma]
IMAGE_SIGNIF:    14.23 [sigma]
MERIT_PARAMS:     +1  +0  +0  +0  +2  +3  +0  +0 -59  +0 
SUN_POSTN:       320.95d {+21h 23m 47s}  -15.28d {-15d 16' 33"}
SUN_DIST:         53.88 [deg]   Sun_angle= -3.7 [hr] (East of Sun)
MOON_POSTN:       68.32d {+04h 33m 17s}  +26.96d {+26d 57' 31"}
MOON_DIST:        63.67 [deg]
MOON_ILLUM:      69 [%]
GAL_COORDS:      135.09,-74.72 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:        9.97,-17.53 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT-BAT GRB Coordinates.  
COMMENTS:        This is a rate trigger.  
COMMENTS:        A point_source was found.  
COMMENTS:        This does not match any source in the on-board catalog.  
COMMENTS:        This does not match any source in the ground catalog.  
COMMENTS:        This is a GRB.  
COMMENTS:        This trigger occurred at longitude,latitude = 246.80,18.23 [deg].  
COMMENTS:           
COMMENTS:        NOTE: This BAT event is temporally(4.0<100sec) coincident with the FERMI_GBM event (trignum=760583768).

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Fri 07 Feb 25 01:16:32 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      47
TRIGGER_NUM:     760583768
GRB_RA:          232.883d {+15h 31m 32s} (J2000),
                 233.002d {+15h 32m 00s} (current),
                 232.648d {+15h 30m 36s} (1950)
GRB_DEC:         +61.250d {+61d 15' 00"} (J2000),
                 +61.166d {+61d 09' 57"} (current),
                 +61.418d {+61d 25' 06"} (1950)
GRB_ERROR:       50.00 [deg radius, statistical plus systematic]
GRB_INTEN:       0 [cnts/sec]
DATA_SIGNIF:     7.90 [sigma]
INTEG_TIME:      2.048 [sec]
GRB_DATE:        20713 TJD;    38 DOY;   25/02/07
GRB_TIME:        4563.15 SOD {01:16:03.15} UT
GRB_PHI:         330.00 [deg]
GRB_THETA:       170.00 [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:       0,1,0, 0,1,0, 0,0,0, 0,0,0, 0,0,
SUN_POSTN:       320.95d {+21h 23m 47s}  -15.28d {-15d 16' 33"}
SUN_DIST:        102.36 [deg]   Sun_angle= 5.9 [hr] (West of Sun)
MOON_POSTN:       68.32d {+04h 33m 17s}  +26.96d {+26d 57' 32"}
MOON_DIST:        91.00 [deg]
MOON_ILLUM:      69 [%]
GAL_COORDS:       96.13, 46.68 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      180.62, 73.13 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250207053/quicklook/glg_lc_medres34_bn250207053.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 206.80,-13.18 [deg].
COMMENTS:        WARNING: This Notice was received with a negative intensityfield -- INTEN was set to 0.  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(4.0<100sec) coincident with the SWIFT_BAT event (trignum=1287821).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Fri 07 Feb 25 01:16:43 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      58
TRIGGER_NUM:     760583768
GRB_RA:           26.983d {+01h 47m 56s} (J2000),
                  27.272d {+01h 49m 05s} (current),
                  26.407d {+01h 45m 38s} (1950)
GRB_DEC:         -27.183d {-27d 10' 59"} (J2000),
                 -27.059d {-27d 03' 31"} (current),
                 -27.432d {-27d 25' 54"} (1950)
GRB_ERROR:       9.28 [deg radius, statistical plus systematic]
GRB_INTEN:       180 [cnts/sec]
DATA_SIGNIF:     17.60 [sigma]
INTEG_TIME:      4.096 [sec]
GRB_DATE:        20713 TJD;    38 DOY;   25/02/07
GRB_TIME:        4563.15 SOD {01:16:03.15} UT
GRB_PHI:         290.00 [deg]
GRB_THETA:        30.00 [deg]
DATA_TIME_SCALE: 4.0960 [sec]
HARD_RATIO:      0.64
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      96%  GRB
2nd_MOST_LIKELY:   3%  Generic Transient
DETECTORS:       0,1,0, 0,1,0, 0,0,0, 0,0,0, 0,0,
SUN_POSTN:       320.95d {+21h 23m 47s}  -15.28d {-15d 16' 33"}
SUN_DIST:         62.30 [deg]   Sun_angle= -4.4 [hr] (East of Sun)
MOON_POSTN:       68.32d {+04h 33m 18s}  +26.96d {+26d 57' 33"}
MOON_DIST:        66.90 [deg]
MOON_ILLUM:      69 [%]
GAL_COORDS:      216.42,-77.44 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       13.38,-35.43 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250207053/quicklook/glg_lc_medres34_bn250207053.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 206.80,-13.18 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(4.0<100sec) coincident with the SWIFT_BAT event (trignum=1287821).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Fri 07 Feb 25 01:16:50 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      57
TRIGGER_NUM:     760583768
GRB_RA:           16.330d {+01h 05m 19s} (J2000),
                  16.652d {+01h 06m 36s} (current),
                  15.689d {+01h 02m 45s} (1950)
GRB_DEC:          +0.290d {+00d 17' 24"} (J2000),
                  +0.424d {+00d 25' 26"} (current),
                  +0.022d {+00d 01' 21"} (1950)
GRB_ERROR:       7.19 [deg radius, statistical only]
DATA_SIGNIF:     14.60 [sigma]
DATA_INTERVAL:   4.096 [sec]
GRB_DATE:        20713 TJD;    38 DOY;   25/02/07
GRB_TIME:        4563.15 SOD {01:16:03.15} UT
GRB_PHI:         297.00 [deg]
GRB_THETA:        59.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   4173 (Gnd S/W Version number)
SUN_POSTN:       320.95d {+21h 23m 47s}  -15.28d {-15d 16' 33"}
SUN_DIST:         57.21 [deg]   Sun_angle= -3.7 [hr] (East of Sun)
MOON_POSTN:       68.33d {+04h 33m 18s}  +26.96d {+26d 57' 34"}
MOON_DIST:        56.21 [deg]
MOON_ILLUM:      69 [%]
GAL_COORDS:      130.43,-62.38 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       15.16, -6.15 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250207053/quicklook/glg_lc_medres34_bn250207053.gif
POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_760583768.fits
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        In the LAT Field-of-view.  
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(4.0<100sec) coincident with the SWIFT_BAT event (trignum=1287821).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Fri 07 Feb 25 01:17:26 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      0
TRIGGER_NUM:     760583768
GRB_RA:           13.800d {+00h 55m 12s} (J2000),
                  14.121d {+00h 56m 29s} (current),
                  13.160d {+00h 52m 38s} (1950)
GRB_DEC:          -0.330d {-00d 19' 47"} (J2000),
                  -0.194d {-00d 11' 39"} (current),
                  -0.601d {-00d 36' 02"} (1950)
GRB_ERROR:       5.90 [deg radius, statistical only]
DATA_SIGNIF:     14.00 [sigma]
DATA_INTERVAL:   6.144 [sec]
GRB_DATE:        20713 TJD;    38 DOY;   25/02/07
GRB_TIME:        4563.15 SOD {01:16:03.15} UT
GRB_PHI:         300.00 [deg]
GRB_THETA:        59.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   41731 (Gnd S/W Version number)
SUN_POSTN:       320.95d {+21h 23m 47s}  -15.28d {-15d 16' 32"}
SUN_DIST:         54.61 [deg]   Sun_angle= -3.5 [hr] (East of Sun)
MOON_POSTN:       68.33d {+04h 33m 20s}  +26.96d {+26d 57' 38"}
MOON_DIST:        58.69 [deg]
MOON_ILLUM:      69 [%]
GAL_COORDS:      125.02,-63.19 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       12.57, -5.75 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250207053/quicklook/glg_lc_medres34_bn250207053.gif
POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_760583768.fits
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        In the LAT Field-of-view.  
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(4.0<100sec) coincident with the SWIFT_BAT event (trignum=1287821).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Fri 07 Feb 25 01:17:47 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      2
TRIGGER_NUM:     760583768
GRB_RA:           13.980d {+00h 55m 55s} (J2000),
                  14.299d {+00h 57m 12s} (current),
                  13.345d {+00h 53m 23s} (1950)
GRB_DEC:          -4.380d {-04d 22' 47"} (J2000),
                  -4.244d {-04d 14' 39"} (current),
                  -4.651d {-04d 39' 01"} (1950)
GRB_ERROR:       2.86 [deg radius, statistical only]
DATA_SIGNIF:     28.00 [sigma]
DATA_INTERVAL:   11.264 [sec]
GRB_DATE:        20713 TJD;    38 DOY;   25/02/07
GRB_TIME:        4563.15 SOD {01:16:03.15} UT
GRB_PHI:         301.00 [deg]
GRB_THETA:        55.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   41731 (Gnd S/W Version number)
SUN_POSTN:       320.95d {+21h 23m 47s}  -15.28d {-15d 16' 32"}
SUN_DIST:         53.58 [deg]   Sun_angle= -3.6 [hr] (East of Sun)
MOON_POSTN:       68.34d {+04h 33m 20s}  +26.96d {+26d 57' 40"}
MOON_DIST:        60.76 [deg]
MOON_ILLUM:      69 [%]
GAL_COORDS:      125.82,-67.23 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       11.15, -9.55 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250207053/quicklook/glg_lc_medres34_bn250207053.gif
POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_760583768.fits
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        In the LAT Field-of-view.  
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(4.0<100sec) coincident with the SWIFT_BAT event (trignum=1287821).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Fri 07 Feb 25 01:17:58 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      3
TRIGGER_NUM:     760583768
GRB_RA:           14.510d {+00h 58m 02s} (J2000),
                  14.826d {+00h 59m 18s} (current),
                  13.881d {+00h 55m 31s} (1950)
GRB_DEC:          -9.390d {-09d 23' 23"} (J2000),
                  -9.255d {-09d 15' 16"} (current),
                  -9.660d {-09d 39' 35"} (1950)
GRB_ERROR:       2.81 [deg radius, statistical only]
DATA_SIGNIF:     38.70 [sigma]
DATA_INTERVAL:   15.360 [sec]
GRB_DATE:        20713 TJD;    38 DOY;   25/02/07
GRB_TIME:        4563.15 SOD {01:16:03.15} UT
GRB_PHI:         302.00 [deg]
GRB_THETA:        50.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   41731 (Gnd S/W Version number)
SUN_POSTN:       320.95d {+21h 23m 47s}  -15.28d {-15d 16' 32"}
SUN_DIST:         52.87 [deg]   Sun_angle= -3.6 [hr] (East of Sun)
MOON_POSTN:       68.34d {+04h 33m 21s}  +26.96d {+26d 57' 41"}
MOON_DIST:        63.24 [deg]
MOON_ILLUM:      69 [%]
GAL_COORDS:      128.26,-72.19 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:        9.62,-14.36 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250207053/quicklook/glg_lc_medres34_bn250207053.gif
POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_760583768.fits
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        In the LAT Field-of-view.  
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(4.0<100sec) coincident with the SWIFT_BAT event (trignum=1287821).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Fri 07 Feb 25 01:18:09 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      4
TRIGGER_NUM:     760583768
GRB_RA:           14.280d {+00h 57m 07s} (J2000),
                  14.597d {+00h 58m 23s} (current),
                  13.650d {+00h 54m 36s} (1950)
GRB_DEC:          -8.390d {-08d 23' 23"} (J2000),
                  -8.255d {-08d 15' 16"} (current),
                  -8.660d {-08d 39' 36"} (1950)
GRB_ERROR:       2.48 [deg radius, statistical only]
DATA_SIGNIF:     43.80 [sigma]
DATA_INTERVAL:   20.480 [sec]
GRB_DATE:        20713 TJD;    38 DOY;   25/02/07
GRB_TIME:        4563.15 SOD {01:16:03.15} UT
GRB_PHI:         302.00 [deg]
GRB_THETA:        51.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   41731 (Gnd S/W Version number)
SUN_POSTN:       320.95d {+21h 23m 47s}  -15.28d {-15d 16' 32"}
SUN_DIST:         52.87 [deg]   Sun_angle= -3.6 [hr] (East of Sun)
MOON_POSTN:       68.34d {+04h 33m 21s}  +26.96d {+26d 57' 42"}
MOON_DIST:        62.83 [deg]
MOON_ILLUM:      69 [%]
GAL_COORDS:      127.30,-71.21 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:        9.81,-13.35 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250207053/quicklook/glg_lc_medres34_bn250207053.gif
POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_760583768.fits
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        In the LAT Field-of-view.  
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(4.0<100sec) coincident with the SWIFT_BAT event (trignum=1287821).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Fri 07 Feb 25 01:17:36 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      1
TRIGGER_NUM:     760583768
GRB_RA:           17.360d {+01h 09m 26s} (J2000),
                  17.681d {+01h 10m 44s} (current),
                  16.720d {+01h 06m 53s} (1950)
GRB_DEC:          -0.540d {-00d 32' 23"} (J2000),
                  -0.407d {-00d 24' 23"} (current),
                  -0.806d {-00d 48' 21"} (1950)
GRB_ERROR:       4.73 [deg radius, statistical only]
DATA_SIGNIF:     20.80 [sigma]
DATA_INTERVAL:   8.192 [sec]
GRB_DATE:        20713 TJD;    38 DOY;   25/02/07
GRB_TIME:        4563.15 SOD {01:16:03.15} UT
GRB_PHI:         296.00 [deg]
GRB_THETA:        58.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   41731 (Gnd S/W Version number)
SUN_POSTN:       320.95d {+21h 23m 47s}  -15.28d {-15d 16' 32"}
SUN_DIST:         57.93 [deg]   Sun_angle= -3.8 [hr] (East of Sun)
MOON_POSTN:       68.33d {+04h 33m 20s}  +26.96d {+26d 57' 39"}
MOON_DIST:        55.81 [deg]
MOON_ILLUM:      69 [%]
GAL_COORDS:      132.91,-63.06 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       15.80, -7.32 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250207053/quicklook/glg_lc_medres34_bn250207053.gif
POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_760583768.fits
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        In the LAT Field-of-view.  
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(4.0<100sec) coincident with the SWIFT_BAT event (trignum=1287821).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Fri 07 Feb 25 01:25:23 UT
NOTICE_TYPE:     Fermi-GBM Final Position
RECORD_NUM:      0
TRIGGER_NUM:     760583768
GRB_RA:           11.750d {+00h 47m 00s} (J2000),
                  12.065d {+00h 48m 16s} (current),
                  11.123d {+00h 44m 29s} (1950)
GRB_DEC:         -13.300d {-13d 18' 00"} (J2000),
                 -13.163d {-13d 09' 47"} (current),
                 -13.573d {-13d 34' 21"} (1950)
GRB_ERROR:       3.23 [deg radius, statistical only]
GRB_DATE:        20713 TJD;    38 DOY;   25/02/07
GRB_TIME:        4563.15 SOD {01:16:03.15} UT
GRB_PHI:         307.00 [deg]
GRB_THETA:        47.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   41731 (Gnd S/W Version number)
SUN_POSTN:       320.95d {+21h 23m 48s}  -15.27d {-15d 16' 26"}
SUN_DIST:         49.48 [deg]   Sun_angle= -3.4 [hr] (East of Sun)
MOON_POSTN:       68.42d {+04h 33m 40s}  +26.97d {+26d 58' 25"}
MOON_DIST:        67.82 [deg]
MOON_ILLUM:      69 [%]
GAL_COORDS:      118.42,-76.13 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:        5.42,-16.85 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250207053/quicklook/glg_lc_medres34_bn250207053.gif
LOC_URL:         http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250207053/quicklook/glg_locplot_all_bn250207053.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:        In the LAT Field-of-view.  
COMMENTS:        This is likely a Long GRB.  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(4.0<100sec) coincident with the SWIFT_BAT event (trignum=1287821).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 07 Feb 25 01:18:27 UT
NOTICE_TYPE:     Swift-XRT Image
TRIGGER_NUM:     1287821,   Seg_Num: 0
GRB_RA:           16.0892d {+01h 04m 21.4s} (J2000),
                  16.4025d {+01h 05m 36.5s} (current),
                  15.4652d {+01h 01m 51.6s} (1950)
GRB_DEC:         -12.1633d {-12d 09' 47.8"} (J2000),
                 -12.0291d {-12d 01' 44.8"} (current),
                 -12.4312d {-12d 25' 52.3"} (1950)
GRB_ERROR:       5.8 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       32 [cnts]
IMG_START_DATE:  20713 TJD;    38 DOY;   25/02/07
IMG_START_TIME:  4673.25 SOD {01:17:53.25} UT,   105.9 [sec] since BAT Trigger Time
CENTROID_X:      286.65,  raw= 287  [pixels]
CENTROID_Y:      306.15,  raw= 306  [pixels]
ROLL:            259.86 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   17.58
GRB_POS_XRT_Z:   -58.79
IMAGE_URL:       sw01287821000msxps_rw.img
SUN_POSTN:       320.95d {+21h 23m 47s}  -15.28d {-15d 16' 32"}
SUN_DIST:         53.85 [deg]   Sun_angle= -3.7 [hr] (East of Sun)
MOON_POSTN:       68.34d {+04h 33m 22s}  +26.96d {+26d 57' 44"}
MOON_DIST:        63.71 [deg]
MOON_ILLUM:      69 [%]
GAL_COORDS:      135.00,-74.73 [deg] galactic lon,lat of the burst
ECL_COORDS:        9.95,-17.52 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 07 Feb 25 01:18:30 UT
NOTICE_TYPE:     Swift-XRT Processed Image
TRIGGER_NUM:     1287821,   Seg_Num: 0
GRB_RA:           16.0892d {+01h 04m 21.4s} (J2000),
                  16.4025d {+01h 05m 36.5s} (current),
                  15.4652d {+01h 01m 51.6s} (1950)
GRB_DEC:         -12.1633d {-12d 09' 47.8"} (J2000),
                 -12.0291d {-12d 01' 44.8"} (current),
                 -12.4312d {-12d 25' 52.3"} (1950)
GRB_ERROR:       5.8 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       32 [cnts]
IMG_START_DATE:  20713 TJD;    38 DOY;   25/02/07
IMG_START_TIME:  4673.25 SOD {01:17:53.25} UT,   105.9 [sec] since BAT Trigger Time
CENTROID_X:      286.65,  raw= 287  [pixels]
CENTROID_Y:      306.15,  raw= 306  [pixels]
ROLL:            259.86 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   17.58
GRB_POS_XRT_Z:   -58.79
IMAGE_URL:       sw01287821000msxps_rw.img
SUN_POSTN:       320.95d {+21h 23m 47s}  -15.28d {-15d 16' 32"}
SUN_DIST:         53.85 [deg]   Sun_angle= -3.7 [hr] (East of Sun)
MOON_POSTN:       68.34d {+04h 33m 22s}  +26.96d {+26d 57' 44"}
MOON_DIST:        63.71 [deg]
MOON_ILLUM:      69 [%]
GAL_COORDS:      135.00,-74.73 [deg] galactic lon,lat of the burst
ECL_COORDS:        9.95,-17.52 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Processed Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 07 Feb 25 01:18:17 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     1287821,   Seg_Num: 0
GRB_RA:           16.0892d {+01h 04m 21.40s} (J2000),
                  16.4025d {+01h 05m 36.59s} (current),
                  15.4652d {+01h 01m 51.64s} (1950)
GRB_DEC:         -12.1633d {-12d 09' 47.8"} (J2000),
                 -12.0291d {-12d 01' 44.8"} (current),
                 -12.4312d {-12d 25' 52.3"} (1950)
GRB_ERROR:       5.9 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       7.54e-10 [erg/cm2/sec]
GRB_SIGNIF:      5.65 [sigma]
IMG_START_DATE:  20713 TJD;    38 DOY;   25/02/07
IMG_START_TIME:  4673.25 SOD {01:17:53.25} UT,   105.9 [sec] since BAT Trigger Time
TAM[0-3]:        327.68 237.14 261.59 243.75
AMPLIFIER:       2
WAVEFORM:        134
SUN_POSTN:       320.95d {+21h 23m 47s}  -15.28d {-15d 16' 32"}
SUN_DIST:         53.85 [deg]   Sun_angle= -3.7 [hr] (East of Sun)
MOON_POSTN:       68.34d {+04h 33m 22s}  +26.96d {+26d 57' 43"}
MOON_DIST:        63.71 [deg]
MOON_ILLUM:      69 [%]
GAL_COORDS:      135.00,-74.73 [deg] galactic lon,lat of the burst
ECL_COORDS:        9.95,-17.52 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        The XRT position is 1.52 arcmin from the BAT position.

GCN Circular #39181
The Fermi GBM team reports the detection of a likely LONG GRB
At 01:16:03 UT on 7 Feb 2025, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 250207A (trigger 760583768.15163 / 250207053).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 11.8, Dec = -13.3 (J2000 degrees, equivalent to J2000 00h 47m, -13d 18'), with a statistical uncertainty of 3.2 degrees.
The angle from the Fermi LAT boresight is 47.0 degrees.
The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250207053/quicklook/glg_skymap_all_bn250207053.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/bn250207053/quicklook/glg_healpix_all_bn250207053.fit
The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250207053/quicklook/glg_lc_medres34_bn250207053.gif

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 07 Feb 25 01:21:21 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     1287821,   Seg_Num: 0
POINT_RA:         16.105d {+01h 04m 25s} (J2000)
POINT_DEC:       -12.156d {-12d 09' 20"} (J2000)
POINT_ROLL:      259.857d
IMG_START_DATE:  20713 TJD;    38 DOY;   25/02/07
IMG_START_TIME:  4680.73 SOD {01:18:00.73} UT,   113.4 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        4.654
N_STARS:         14
X_OFFSET:        400 [pixels]
Y_OFFSET:        552 [pixels]
X_MAX:           1359 [pixels]
Y_MAX:           1511 [pixels]
DET_THRESH:      18
PHOTO_THRESH:    10
SL_URL:          sw01287821000msufc0113.fits
SUN_POSTN:       320.95d {+21h 23m 48s}  -15.28d {-15d 16' 29"}
SUN_DIST:         53.86 [deg]   Sun_angle= -3.7 [hr] (East of Sun)
MOON_POSTN:       68.37d {+04h 33m 29s}  +26.97d {+26d 58' 01"}
MOON_DIST:        63.72 [deg]
MOON_ILLUM:      69 [%]
GAL_COORDS:      135.06,-74.72 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:        9.97,-17.52 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 07 Feb 25 01:20:08 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     1287821,   Seg_Num: 0
GRB_RA:           16.115d {+01h 04m 28s} (J2000),
                  16.428d {+01h 05m 43s} (current),
                  15.491d {+01h 01m 58s} (1950)
GRB_DEC:         -12.159d {-12d 09' 30"} (J2000),
                 -12.025d {-12d 01' 27"} (current),
                 -12.427d {-12d 25' 35"} (1950)
GRB_DATE:        20713 TJD;    38 DOY;   25/02/07
GRB_TIME:        4567.33 SOD {01:16:07.33} UT
TRIGGER_INDEX:   146
GRB_PHI:         -171.20 [deg]
GRB_THETA:        35.41 [deg]
DELTA_TIME:      -76.00 [sec]
TRIGGER_DUR:     1.024 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     34.52 [sigma]
IMAGE_SIGNIF:    14.23 [sigma]
LC_URL:          sw01287821000msb.lc
SUN_POSTN:       320.95d {+21h 23m 47s}  -15.28d {-15d 16' 30"}
SUN_DIST:         53.87 [deg]   Sun_angle= -3.7 [hr] (East of Sun)
MOON_POSTN:       68.36d {+04h 33m 26s}  +26.96d {+26d 57' 54"}
MOON_DIST:        63.70 [deg]
MOON_ILLUM:      69 [%]
GAL_COORDS:      135.09,-74.72 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:        9.97,-17.53 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT-BAT GRB Lightcurve.  
COMMENTS:           
COMMENTS:        The next comments were copied from the BAT_POS Notice:  
COMMENTS:        This is a rate trigger.  
COMMENTS:        A point_source was found.  
COMMENTS:        This does not match any source in the on-board catalog.  
COMMENTS:        This does not match any source in the ground catalog.  
COMMENTS:        This is a GRB.  
COMMENTS:        This trigger occurred at longitude,latitude = 246.80,18.23 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 07 Feb 25 01:23:21 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     1287821,   Seg_Num: 0
POINT_RA:         16.105d {+01h 04m 25s} (J2000)
POINT_DEC:       -12.156d {-12d 09' 20"} (J2000)
ROLL:            259.857d
IMG_START_DATE:  20713 TJD;    38 DOY;   25/02/07
IMG_START_TIME:  4680.73 SOD {01:18:00.73} UT,   113.4 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     760583915
X_OFFSET:        876 [pixels]
Y_OFFSET:        785 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1036
Y_GRB_POS:       945
BINNING_INDEX:   1
IM_URL:          sw01287821000msuni0149.fits
SUN_POSTN:       320.95d {+21h 23m 48s}  -15.27d {-15d 16' 28"}
SUN_DIST:         53.86 [deg]   Sun_angle= -3.7 [hr] (East of Sun)
MOON_POSTN:       68.39d {+04h 33m 35s}  +26.97d {+26d 58' 13"}
MOON_DIST:        63.74 [deg]
MOON_ILLUM:      69 [%]
GAL_COORDS:      135.06,-74.72 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:        9.97,-17.52 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        The GRB Position came from the XRT Position Command.  
COMMENTS:        The image has 2x2 binning (compression).  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 07 Feb 25 01:21:32 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     1287821,   Seg_Num: 0
POINT_RA:         16.105d {+01h 04m 25s} (J2000)
POINT_DEC:       -12.156d {-12d 09' 20"} (J2000)
POINT_ROLL:      259.857d
IMG_START_DATE:  20713 TJD;    38 DOY;   25/02/07
IMG_START_TIME:  4680.73 SOD {01:18:00.73} UT,   113.4 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        4.654
N_STARS:         14
X_OFFSET:        400 [pixels]
Y_OFFSET:        552 [pixels]
X_MAX:           1359 [pixels]
Y_MAX:           1511 [pixels]
DET_THRESH:      18
PHOTO_THRESH:    10
SL_URL:          sw01287821000msufc0113.fits
SUN_POSTN:       320.95d {+21h 23m 48s}  -15.28d {-15d 16' 29"}
SUN_DIST:         53.86 [deg]   Sun_angle= -3.7 [hr] (East of Sun)
MOON_POSTN:       68.37d {+04h 33m 30s}  +26.97d {+26d 58' 02"}
MOON_DIST:        63.72 [deg]
MOON_ILLUM:      69 [%]
GAL_COORDS:      135.06,-74.72 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:        9.97,-17.52 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 07 Feb 25 01:25:54 UT
NOTICE_TYPE:     Swift-UVOT Position
TRIGGER_NUM:     1287821,   Seg_Num: 0
GRB_RA:           16.0891d {+01h 04m 21.38s} (J2000),
                  16.4024d {+01h 05m 36.56s} (current),
                  15.4651d {+01h 01m 51.61s} (1950)
GRB_DEC:         -12.1645d {-12d 09' 52.2"} (J2000),
                 -12.0303d {-12d 01' 49.1"} (current),
                 -12.4324d {-12d 25' 56.6"} (1950)
GRB_ERROR:       0.7 [arcsec radius, statistical only]
GRB_MAG:         15.03 +/- 0.14 [mag]
FILTER:          10, White
IMG_START_DATE:  20713 TJD;    38 DOY;   25/02/07
IMG_START_TIME:  4677.00 SOD {01:17:57.00} UT,   109.7 [sec] since BAT Trigger Time
SUN_POSTN:       320.95d {+21h 23m 48s}  -15.27d {-15d 16' 26"}
SUN_DIST:         53.84 [deg]   Sun_angle= -3.7 [hr] (East of Sun)
MOON_POSTN:       68.42d {+04h 33m 41s}  +26.97d {+26d 58' 28"}
MOON_DIST:        63.78 [deg]
MOON_ILLUM:      69 [%]
GAL_COORDS:      135.00,-74.73 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:        9.95,-17.52 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT UVOT Position Notice.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        The UVOT position is 4.3 arcsec from the XRT position.  
COMMENTS:        Result based on Genie data.  
COMMENTS:        Notice generated automatically.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 07 Feb 25 01:23:15 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     1287821,   Seg_Num: 0
POINT_RA:         16.105d {+01h 04m 25s} (J2000)
POINT_DEC:       -12.156d {-12d 09' 20"} (J2000)
ROLL:            259.857d
IMG_START_DATE:  20713 TJD;    38 DOY;   25/02/07
IMG_START_TIME:  4680.73 SOD {01:18:00.73} UT,   113.4 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     760583915
X_OFFSET:        876 [pixels]
Y_OFFSET:        785 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1036
Y_GRB_POS:       945
BINNING_INDEX:   1
IM_URL:          sw01287821000msuni0149.fits
SUN_POSTN:       320.95d {+21h 23m 48s}  -15.27d {-15d 16' 28"}
SUN_DIST:         53.86 [deg]   Sun_angle= -3.7 [hr] (East of Sun)
MOON_POSTN:       68.39d {+04h 33m 34s}  +26.97d {+26d 58' 13"}
MOON_DIST:        63.74 [deg]
MOON_ILLUM:      69 [%]
GAL_COORDS:      135.06,-74.72 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:        9.97,-17.52 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Image.  
COMMENTS:        The GRB Position came from the XRT Position Command.  
COMMENTS:        The image has 2x2 binning (compression).

GCN Circular #39182
M. Ferro (INAF-OAB), R. Gupta (NASA GSFC), J. A. Kennea (PSU), K. L. Page (U Leicester) and B. Sbarufatti (INAF-OAB) report on behalf of the Neil Gehrels Swift Observatory Team:
At 01:16:07 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 250207A (trigger=1287821). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 16.115, -12.159 which is
```
   RA(J2000) = 01h 04m 28s
   Dec(J2000) = -12d 09' 30"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a complex structure with a duration of about 30 sec. The peak count rate was ~3847 counts/sec (15-350 keV), at ~6 sec after the trigger.
The XRT began observing the field at 01:17:53.2 UT, 105.9 seconds after the BAT trigger. XRT found a bright, uncatalogued X-ray source located at RA, Dec 16.0892, -12.1633 which is equivalent to:
```
   RA(J2000)  = 01h 04m 21.41s
   Dec(J2000) = -12d 09' 47.9"
```
with an uncertainty of 5.9 arcseconds (radius, 90% containment). This location is 92 arcseconds from the BAT onboard position, within the BAT error circle. Despite the onboard localisation, no X-ray source was detected in 85 s of promptly-downlinked data, suggesting that the initial centroid may equally have been a cosmic ray. This position should therefore be treated with caution.
The initial flux in the 2.5 s image was 7.54e-10 erg cm^-2 s^-1 (0.2-10 keV).
UVOT took a finding chart exposure of 150 seconds with the White filter starting 113 seconds after the BAT trigger. There is a candidate afterglow in the rapidly available 2.7'x2.7' sub-image at
```
  RA(J2000)  =	01:04:21.41 =  16.08919
  DEC(J2000) = -12:09:52.5  = -12.16458
```
with a 90%-confidence error radius of about 0.74 arc sec. This position is 4.6 arc sec. from the center of the XRT error circle. The estimated magnitude is 15.04 with a 1-sigma error of about 0.14. No correction has been made for the expected extinction corresponding to E(B-V) of 0.027.
Burst Advocate for this burst is M. Ferro (matteo.ferro AT inaf.it). Please contact the BA by email if you require additional information regarding Swift followup of this burst. In extremely urgent cases, after trying the Burst Advocate, you can contact the Swift PI by phone (see Swift TOO web site for information: http://www.swift.psu.edu/)

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 07 Feb 25 01:45:10 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     1287821,   Seg_Num: 0
GRB_RA:           16.0900d {+01h 04m 21.59s} (J2000),
                  16.4033d {+01h 05m 36.78s} (current),
                  15.4660d {+01h 01m 51.83s} (1950)
GRB_DEC:         -12.1645d {-12d 09' 52.2"} (J2000),
                 -12.0303d {-12d 01' 49.1"} (current),
                 -12.4324d {-12d 25' 56.6"} (1950)
GRB_ERROR:       4.4 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  20713 TJD;    38 DOY;   25/02/07
IMG_START_TIME:  5061.00 SOD {01:24:21.00} UT,   493.7 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       320.97d {+21h 23m 52s}  -15.27d {-15d 16' 11"}
SUN_DIST:         53.83 [deg]   Sun_angle= -3.7 [hr] (East of Sun)
MOON_POSTN:       68.62d {+04h 34m 30s}  +27.01d {+27d 00' 23"}
MOON_DIST:        63.95 [deg]
MOON_ILLUM:      69 [%]
GAL_COORDS:      135.01,-74.73 [deg] galactic lon,lat of the burst
ECL_COORDS:        9.95,-17.52 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        This is an Update Notice -- the RA,Dec values herein supersede the previous XRT_POS Notice.  
COMMENTS:        TAM values, flux and significance fields are not valid.  
COMMENTS:        This position was automatically generated on the ground using  
COMMENTS:        Photon Counting data telemetered via TDRSS (SPER data).  
COMMENTS:        See http://www.swift.ac.uk/sper/docs.php for details.  
COMMENTS:        The probability that this is a serendipitous source in the  
COMMENTS:        SPER window is 1.1% < P(seren) < 2.8%.

GCN Circular #39186
Camila Angulo (UNAM), Alan M. Watson (UNAM), Noémie Globus (UNAM), Stéphane Basa (UAR Pytheas), William H. Lee (UNAM), Dalya Akl (AUS), Sarah Antier (OCA), Jean-Luc Atteia (IRAP), Rosa L. Becerra (Università degli Studi di Roma Tor Vergata), Nathaniel R. Butler (ASU), Damien Dornic (CPPM), Jean-Grégoire Ducoin (CPPM), Francis Fortin (IRAP), Francesco Magnani (CPPM), Margarita Pereyra (UNAM), and Benjamin Schneider (LAM) report:
We imaged the field of GRB 250207A detected by Fermi/GBM (Fermi GBM Team, GCN Circ. 39181) and Swift/BAT (Ferro et al., GCN Circ.39182) with the DDRAGO wide-field camera on the COLIBRÍ (SVOM/F-GFT) telescope at the Observatorio Astronómico Nacional on the Sierra de San Pedro Mártir in Mexico. We observed from 2025-02-07 02:34 to 02:55 UTC (78 to 99 min after the burst), with a midpoint of 88.5 minutes after the event, and obtained 960 seconds of exposure in the r filter in good weather conditions. The data were reduced and stacked using custom software and then calibrated against the PS1 catalog and analysed using STDPipe (Karpov 2021).
At the position of the afterglow detected by XRT and UVOT (Ferro et al., GCN Circ. 39182), we detect a source with
r = 18.90 +/- 0.01
and confirm fading relative to the UVOT observation.
Our magnitude is not corrected for Galactic extinction.
Further observations are planned.
We warmly thank the COLIBRÍ and DDRAGO engineering teams and the staff of the Observatorio Astronómico Nacional on the Sierra de San Pedro Mártir.
GCN Circular #39199
Paul Kuin (MSSL/UCL) and M. Ferro (INAF-OAB) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 250207A 113 s after the BAT trigger (Ferro et al., GCN Circ. 39182). The source was also reported by Angulo et al. GCN Circ. 39186.
The preliminary UVOT position is:
```
    RA  (J2000) =  01:04:21.39 =  16.08912 (deg.)
    Dec (J2000) = -12:09:52.5  = -12.16459 (deg.)
```
with an estimated uncertainty of 0.42 arc sec. (radius, 90% confidence).
Preliminary detections using the UVOT photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the early exposures are:
```
Filter         T_start(s)   T_stop(s)      Exp(s)           Mag

white              113          263          147         15.00 +/- 0.02
v                  655          674           19         16.89 +/- 0.20
b                  581          600           19         16.56 +/- 0.09
u                  326          575          246         15.65 +/- 0.03
uvm2               679          699           19         > 17.3 (3 sigma UL)
uvw2               630          650           19         > 17.6 (3 sigma UL)
```
The lack of detection in the UVM2 band may indicate a redshift greater than 1.3.
The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.027 in the direction of the burst (Schlegel et al. 1998).
GCN Circular #39202
R. Brivio, M. Ferro, P. D’Avanzo, S. Covino (INAF-OAB), A. Melandri (INAF-OAR), D. B. Malesani (DAWN/NBI and Radboud Univ.), G. Tagliaferri, D. Fugazza (INAF-OAB) report on behalf of the REM team:
We observed the field of GRB 250207A, detected by Fermi/GBM (Fermi GBM Team, GCN 39181) and Swift/BAT (Ferro et al., GCN 39182) with the REM 60cm robotic telescope located at the ESO observatory of La Silla (Chile). The observations were carried in the g, r, i, z, J, H, K bands, starting on 2025 February 07 at 01:17:08 UT (i.e. 61 s after the Swift trigger), and lasting for about 2 hours. From preliminary photometry we detect the counterpart in the optical images at the position of the optical afterglow (Angulo et al., GCN 39186; Kuin & Ferro, GCN 39199) with the following magnitude:
r = 12.7 +/- 0.1 (AB; calibrated against the Pan-STARRS catalogue) at a mid-time of t - t0 = 66 s after the trigger.
The analysis of the NIR data is ongoing.
GCN Circular #39209
Martin Jelinek (ASU CAS Ondrejov, CZ), Martin Masek, Petr Janecek, Sergey Karpov, Jakub Jurysek, Jan Ebr, Ronan Cunniffe, Petr Travnicek, Michael Prouza (Institute of Physics, Prague, CZ) and Jan Strobl (ASU CAS Ondrejov, CZ) report:
The 30cm robotic telescope FRAM-Auger in Malargue (Argentina) reacted robotically to the Swift/BAT and Fermi/GBM alert of GRB250207A (Fermi GBM Team, GCN 39181; Ferro et al., GCN 39182), starting with a series of 20s R-band images at 01:16:49 UT, i.e. 42s post trigger.
We detect the optical afterglow at the position reported by Brivio et al. (GCN 39202), Kuin & Ferro (GCN 39199), and Angulo et al. (GCN 39186) in our initial frames. The early light curve shows a relatively steep decay with a power-law index alpha ~ 1.6. Extrapolation of this decay rate appears inconsistent with later observations by COLIBRI (Angulo et al., GCN 39186), suggesting a possible transition in the light curve slope beyond ~600s post burst.
GCN Circular #39212
M. Ferro, R. Brivio, P. D’Avanzo, S. Covino, D. Fugazza (INAF-OAB) report on behalf of the REM team:
We observed the field of GRB 250207A, detected by Fermi/GBM (Fermi GBM Team, GCN 39181) and Swift/BAT (Ferro et al., GCN 39182) with the REM 60cm robotic telescope located at the ESO observatory of La Silla (Chile). The observations were carried in the g, r, i, z, J, H, K bands, starting on 2025 February 07 at 01:17:08 UT (i.e. 61 s after the Swift trigger), and lasting for about 2 hours.
From preliminary photometry we detect the counterpart in the IR images at the position of the optical afterglow (Angulo et al., GCN 39186; Kuin & Ferro, GCN 39199; Brivio et al., GCN 39202; Jelinek et al., GCN 39209) with the following magnitude:
H ~ 13.3 (Vega; calibrated against the 2MASS catalogue) at a mid-time of t - t0 = 26.6 minutes after the trigger.
GCN Circular #39217
J.P. Osborne, A.P. Beardmore, P.A. Evans and M.R. Goad (U. Leicester) report on behalf of the Swift-XRT team.
Using 1772 s of XRT Photon Counting mode data and 3 UVOT images for GRB 250207A, we find an astrometrically corrected X-ray position (using the XRT-UVOT alignment and matching UVOT field sources to the USNO-B1 catalogue): RA, Dec = 16.08929, -12.16479 which is equivalent to:
```
RA (J2000): 01h 04m 21.43s
Dec (J2000): -12d 09' 53.3"
```
with an uncertainty of 2.2 arcsec (radius, 90% confidence).
This position may be improved as more data are received. The latest position can be viewed at http://www.swift.ac.uk/xrt_positions. Position enhancement is described by Goad et al. (2007, A&A, 476, 1401) and Evans et al. (2009, MNRAS, 397, 1177).
This circular was automatically generated, and is an official product of the Swift-XRT team.
GCN Circular #39221
A. Melandri (INAF-OAR), T. Sbarrato (INAF-OAB), D.N. Burrows (PSU), M. A. Williams (PSU), S. Dichiara (PSU), J.P. Osborne (U. Leicester), K.L. Page (U. Leicester), P. D'Avanzo (INAF-OAB) and P.A. Evans report on behalf of the Swift-XRT team:
We have analysed 6.0 ks of XRT data for GRB 250207A, from 100 s to 73.6 ks after the BAT trigger. The data comprise 370 s in Windowed Timing (WT) mode (the first 4 s were taken while Swift was slewing) with the remainder in Photon Counting (PC) mode.
The late-time light curve (from T0+4.2 ks) can be modelled with a power-law decay with a decay index of alpha=1.22 (+0.13, -0.10).
A spectrum formed from the WT mode data can be fitted with an absorbed power-law with a photon spectral index of 2.14 (+/-0.06). The best-fitting absorption column is 6.7 (+/-1.2) x 10^20 cm^-2, in excess of the Galactic value of 2.4 x 10^20 cm^-2 (Willingale et al. 2013). The PC mode spectrum has a photon index of 2.02 (+0.16, -0.15) and a best-fitting absorption column of 5.5 (+3.5, -3.1) x 10^20 cm^-2. The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 3.3 x 10^-11 (3.8 x 10^-11) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
```
Total column:	     5.5 (+3.5, -3.1) x 10^20 cm^-2
Galactic foreground: 2.4 x 10^20 cm^-2
Excess significance: <1.6 sigma
Photon index:	     2.02 (+0.16, -0.15)
```
If the light curve continues to decay with a power-law decay index of 1.22, the count rate at T+24 hours will be 0.010 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 3.4 x 10^-13 (3.9 x 10^-13) erg cm^-2 s^-1.
The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/01287821.
This circular is an official product of the Swift-XRT team.
GCN Circular #39245
M. J. Moss (GSFC), S. D. Barthelmy (GSFC), M. Ferro (INAF-OAB), R. Gupta (GSFC), H. A. Krimm (NSF), S. Laha (GSFC/UMBC), A. Y. Lien (U Tampa), C. B. Markwardt (GSFC), D. M. Palmer (LANL), T. Parsotan (GSFC), D. Sadaula (GSFC/UMBC), T. Sakamoto (AGU) (i.e. the Swift-BAT team):
Using the data set from T-239 to T+963 sec from the recent telemetry downlink, we report further analysis of BAT GRB 250207A (trigger #1287821) (Ferro, et al., GCN Circ. 39182). The BAT ground-calculated position is RA, Dec = 16.097, -12.165 deg which is
```
   RA(J2000)  =  01h 04m 23.4s 
   Dec(J2000) = -12d 09' 55.0" 
```
with an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment). The partial coding was 72%.
The masked weighted BAT light curve shows a prominent multi-peaked structure, with the most significant activity occurring within the first 50 seconds after the trigger. T90 (15-350 keV) is 52.54 +- 19.87 sec (estimated error including systematics).
The time-averaged spectrum from T-6.60 to T+100.22 sec is the best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.27 +- 0.08. The fluence in the 15-150 keV band is 3.7 +- 0.2 x 10^-06 erg/cm2. The 1-sec peak photon flux measured from T+7.01 sec in the 15-150 keV band is 2.6 +- 0.2 ph/cm2/sec. All the quoted errors are at the 90% confidence level.
The results of the batgrbproduct analysis are available at https://swift.gsfc.nasa.gov/results/batgrbcat/BAT_refined_circular/1287821
GCN Circular #39250
Amit K. Ror, Anshika Gupta, Kiran, Shashi B. Pandey, Kuntal Mishra (ARIES) report:
We observed the field of GRB 250207A detected by the Swift Burst Alert Telescope (Swift team, Ferro et al. 2025; GCN 39182) with the 1.3m Devasthal Fast Optical Telescope (DFOT), located at the Devasthal Observatory of the Aryabhatta Research Institute of Observational Sciences (ARIES), India. The observations were started on 2025-02-07 at 13:41:42 UT, i.e., ~ 0.52 days after the Swift-BAT trigger. We have taken multiple frames with an exposure time of 300 s in the R filter. We stacked the images after the alignment. We detected an optical afterglow in our stacked image within the error box of the enhanced Swift-XRT position by Osborne et al. 2025 (GCN 39217). We obtain the following preliminary magnitude in the stacked image:
```
Date Start_UT T_start-T0 (days) Filter  Exp time (s)  Magnitude
=========================================================
2025-02-07 13:41:42     ~0.52     R     300s*4     21.12 +/- 0.15
```
Our detection is consistent with Angulo et al. 2025 (GCN 39186); Kuin et al. 2025 (GCN 39199); Brivio et al. 2025 (GCN 39202); Jelinek et al. 2025 (GCN 39209) and Ferro et al. 2025 (GCN 39212).
The magnitude is not corrected for the Galactic extinction in the direction of the burst. Photometric calibration is performed using the standard stars from the USNO-B1.0 catalogue. This circular may be cited.
GCN Circular #39274
Donovan Schlekat, Dylan Dutton, Daniel Reichart, Joshua Haislip, and Vladimir Kouprianov report on behalf of the Skynet Robotic Telescope Network at the University of North Carolina at Chapel Hill.
We observed the field of GRB 250207A detected by Fermi (The Fermi GBM Team, GCN 39181) and Swift (Ferro et al., GCN 39182; Osborne et al., GCN 39217; Melandri et al., GCN 39221; Moss et al., GCN 39245) with two of Skynet's PROMPT telescopes located at the Cerro Tololo Inter-American Observatory. The observation began at 01:20:03 UT on February 7 2025, roughly 4 minutes after the Swift-BAT trigger and lasted for around 14 minutes until the field was no longer observable. Observations were performed in the B, V, R, and I bands. Exposure lengths were calculated using our automated exposure length scaling model.
We detect the optical afterglow (Ferro et al., GCN 39182; Angulo et al., GCN 39186; Kuin & Ferro, GCN 39199; Brivio et al., GCN 39202; Jelinek et al., GCN 39209; Ferro et al., 39212; Ror et al., 39250) in the V, R, and I bands. The photometry of the initial detection for each band is reported below.
```
Tmid - T0 (s)| Telescope | Filter | Exposure (s) | Mag	   | Mag Error
------------------------------------------------------------------
747.0        | PROMPT-6  | V      | 22           | 16.854  | 0.064
779.0	     | PROMPT-5  | R      | 16           | 16.593  | 0.097
805.0	     | PROMPT-6  | I      | 10           | 16.570  | 0.061
```
Our images have been calibrated using stars from the APASS catalog. Magnitudes were not corrected for dust extinction.
GCN Circular #39284
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 250207A (Fermi-GBM detection: Fermi GBM team, GCN 39181; Swift-BAT detection: Ferro et al., GCN 39182; Moss et al., GCN 39245) was detected by Konus-Wind (KW) in the waiting mode.
A Bayesian block analysis of the KW waiting mode data reveals a >27 sigma count rate increase in the interval from T0-7.699 s to T0+15.853 s where T0 = T0(BAT) = 01:16:07.33 UT.
The KW light curve of this burst is available at http://www.ioffe.ru/LEA/GRBs/GRB250207A/
Modeling a time-integrated spectrum of the burst (from T0-7.699 s to T0+15.853 s) by a power law with exponential cutoff (CPL) model dN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep): yields alpha = -1.26 (-0.12, + 0.14) and Ep = 329(-64,+91) keV.
The total burst fluence is 1.04(-0.11,+0.13)x10^-5 erg/cm^2, and the 2.944 s peak energy flux, measured from T0+4.077 s, is 7.05(-0.98,+1.08)x10^-7 erg/cm^2. (both in the 20 keV - 10 MeV energy range).
All the quoted errors are estimated at the 68% confidence level. All the presented results are preliminary.
GCN Circular #39291
O. Mukherjee (USRA), R. Hamburg (USRA) and C. Meegan (UAH) report on behalf of the Fermi Gamma-ray Burst Monitor Team:
"At 01:16:03.15 UT on 07 February 2025, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 250207A (trigger 760583768/250207053). which was also detected by Swift BAT (Ferro et al. 2025, GCN 39182), COLIBRÍ/DDRAGO (Angulo et al. 2025, GCN 39186), Swift/UVOT (Kuin et al. 2025, GCN 39199), and Konus-Wind (Ridnaia. et al. 2025, GCN 39284) The Fermi GBM Final Real-time Localization (GCN 39181) is consistent with the Swift BAT position.
The angle from the Fermi LAT boresight is 46 degrees.
The GBM light curve consistes of a single emission episode with multiple peaks with a duration (T90) of about 20 s (50-300 keV). The time-averaged spectrum from T0-3.1 to T0+25.6 s is best fit by a power law function with an exponential high-energy cutoff. The power law index is -1.10 +/- 0.06 and the cutoff energy, parameterized as Epeak, is 290 +/- 30 keV.
The event fluence (10-1000 keV) in this time interval is (1.04 +/- 0.04)E-05 erg/cm^2. The 1-sec peak photon flux measured starting from T0+12 s in the 10-1000 keV band is 4.7 +/- 0.3 ph/s/cm^2.
A Band function fits the spectrum equally well with Epeak= 240 +/- 30 keV, alpha = -1.03 +/- 0.08 and beta = -2.3 +/- 0.3.
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 #39463
A. Gulati (USyd), G. E. Anderson (Curtin), S. Chastain (UNM), A. J. van der Horst (GWU), J. K. Leung (UofT/HUJI), and L. Rhodes (TSI/McGill) on behalf of the ATCA PanRadio GRB collaboration
We observed Swift and Fermi-detected GRB 250207A (Ferro et al., GCN 39182; Fermi GBM Collaboration, GCN 39181) as part of The Australia Telescope Compact Array (ATCA) "PanRadio GRB" Large Project C3542 (PI: G. Anderson) at 5.5 and 9 GHz on 2025-02-12, 2025-02-14 and 2025-02-21.
No radio sources were detected near the Swift/XRT enhanced position (Osborne et al., GCN 39217 )in any of the observation epochs. The 3-sigma upper limits for the 9 GHz observations are 174, 96, and 60 uJy respectively.
We thank the CSIRO Space and Astronomy staff for supporting these observations. We acknowledge the Gomeroi people as the traditional owners of the Observatory site. The Australia Telescope Compact Array is part of the Australia Telescope National Facility (https://ror.org/05qajvd42) which is funded by the Australian Government for operation as a National Facility managed by CSIRO.

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Jochen Greiner, last update: 25-Feb-2025 [Disclaimer]