////////////////////////////////////////////////////////////////////// TITLE: GCN/FERMI NOTICE NOTICE_DATE: Tue 28 Apr 26 14:20:44 UT NOTICE_TYPE: Fermi-GBM Alert RECORD_NUM: 1 TRIGGER_NUM: 799078840 GRB_DATE: 21158 TJD; 118 DOY; 26/04/28 GRB_TIME: 51635.68 SOD {14:20:35.68} UT TRIGGER_SIGNIF: 6.6 [sigma] TRIGGER_DUR: 0.064 [sec] E_RANGE: 3-4 [chan] 47-291 [keV] ALGORITHM: 4 DETECTORS: 0,0,0, 1,1,0, 0,1,1, 0,0,0, 0,0, LC_URL: http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260428598/quicklook/glg_lc_medres34_bn260428598.gif COMMENTS: Fermi-GBM Trigger Alert. COMMENTS: This trigger occurred at longitude,latitude = 147.62,13.93 [deg]. COMMENTS: The LC_URL file will not be created until ~15 min after the trigger. ////////////////////////////////////////////////////////////////////// TITLE: GCN/FERMI NOTICE NOTICE_DATE: Tue 28 Apr 26 14:21:04 UT NOTICE_TYPE: Fermi-GBM Flight Position RECORD_NUM: 46 TRIGGER_NUM: 799078840 GRB_RA: 280.550d {+18h 42m 12s} (J2000), 280.883d {+18h 43m 32s} (current), 279.918d {+18h 39m 40s} (1950) GRB_DEC: +1.750d {+01d 45' 00"} (J2000), +1.777d {+01d 46' 38"} (current), +1.701d {+01d 42' 02"} (1950) GRB_ERROR: 8.62 [deg radius, statistical plus systematic] GRB_INTEN: 573 [cnts/sec] DATA_SIGNIF: 25.20 [sigma] INTEG_TIME: 1.024 [sec] GRB_DATE: 21158 TJD; 118 DOY; 26/04/28 GRB_TIME: 51635.68 SOD {14:20:35.68} UT GRB_PHI: 245.00 [deg] GRB_THETA: 90.00 [deg] DATA_TIME_SCALE: 1.0240 [sec] HARD_RATIO: 0.34 LOC_ALGORITHM: 3 (version number of) MOST_LIKELY: 88% GRB 2nd_MOST_LIKELY: 6% Cyg X-1 DETECTORS: 0,0,0, 1,1,0, 0,1,1, 0,0,0, 0,0, SUN_POSTN: 35.94d {+02h 23m 46s} +14.28d {+14d 16' 31"} SUN_DIST: 113.74 [deg] Sun_angle= 7.7 [hr] (West of Sun) MOON_POSTN: 181.55d {+12h 06m 12s} -3.10d {-03d 05' 51"} MOON_DIST: 99.41 [deg] MOON_ILLUM: 91 [%] GAL_COORDS: 33.44, 2.85 [deg] galactic lon,lat of the burst (or transient) ECL_COORDS: 281.63, 24.76 [deg] ecliptic lon,lat of the burst (or transient) LC_URL: http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260428598/quicklook/glg_lc_medres34_bn260428598.gif COMMENTS: Fermi-GBM Flight-calculated Coordinates. COMMENTS: This trigger occurred at longitude,latitude = 147.62,13.93 [deg]. COMMENTS: The LC_URL file will not be created until ~15 min after the trigger. ////////////////////////////////////////////////////////////////////// TITLE: GCN/FERMI NOTICE NOTICE_DATE: Tue 28 Apr 26 14:21:22 UT NOTICE_TYPE: Fermi-GBM Ground Position RECORD_NUM: 58 TRIGGER_NUM: 799078840 GRB_RA: 277.800d {+18h 31m 12s} (J2000), 278.131d {+18h 32m 31s} (current), 277.171d {+18h 28m 41s} (1950) GRB_DEC: +2.370d {+02d 22' 12"} (J2000), +2.390d {+02d 23' 25"} (current), +2.334d {+02d 20' 01"} (1950) GRB_ERROR: 3.70 [deg radius, statistical only] DATA_SIGNIF: 39.20 [sigma] DATA_INTERVAL: 2.048 [sec] GRB_DATE: 21158 TJD; 118 DOY; 26/04/28 GRB_TIME: 51635.68 SOD {14:20:35.68} UT GRB_PHI: 243.00 [deg] GRB_THETA: 88.00 [deg] E_RANGE: 44.032 - 279.965 [keV] LOC_ALGORITHM: 4173 (Gnd S/W Version number) SUN_POSTN: 35.94d {+02h 23m 46s} +14.28d {+14d 16' 31"} SUN_DIST: 116.20 [deg] Sun_angle= 7.9 [hr] (West of Sun) MOON_POSTN: 181.55d {+12h 06m 12s} -3.10d {-03d 05' 56"} MOON_DIST: 96.69 [deg] MOON_ILLUM: 91 [%] GAL_COORDS: 32.74, 5.58 [deg] galactic lon,lat of the burst (or transient) ECL_COORDS: 278.65, 25.58 [deg] ecliptic lon,lat of the burst (or transient) LC_URL: http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260428598/quicklook/glg_lc_medres34_bn260428598.gif POS_MAP_URL: http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_799078840.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. ////////////////////////////////////////////////////////////////////// TITLE: GCN/FERMI NOTICE NOTICE_DATE: Tue 28 Apr 26 14:21:48 UT NOTICE_TYPE: Fermi-GBM Ground Position RECORD_NUM: 0 TRIGGER_NUM: 799078840 GRB_RA: 276.090d {+18h 24m 22s} (J2000), 276.424d {+18h 25m 42s} (current), 275.456d {+18h 21m 49s} (1950) GRB_DEC: +1.360d {+01d 21' 36"} (J2000), +1.376d {+01d 22' 33"} (current), +1.332d {+01d 19' 55"} (1950) GRB_ERROR: 3.54 [deg radius, statistical only] DATA_SIGNIF: 24.30 [sigma] DATA_INTERVAL: 2.048 [sec] GRB_DATE: 21158 TJD; 118 DOY; 26/04/28 GRB_TIME: 51635.68 SOD {14:20:35.68} UT GRB_PHI: 241.00 [deg] GRB_THETA: 88.00 [deg] E_RANGE: 44.032 - 279.965 [keV] LOC_ALGORITHM: 41731 (Gnd S/W Version number) SUN_POSTN: 35.94d {+02h 23m 46s} +14.28d {+14d 16' 32"} SUN_DIST: 118.13 [deg] Sun_angle= 8.0 [hr] (West of Sun) MOON_POSTN: 181.55d {+12h 06m 13s} -3.10d {-03d 06' 02"} MOON_DIST: 94.94 [deg] MOON_ILLUM: 91 [%] GAL_COORDS: 31.05, 6.64 [deg] galactic lon,lat of the burst (or transient) ECL_COORDS: 276.70, 24.66 [deg] ecliptic lon,lat of the burst (or transient) LC_URL: http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260428598/quicklook/glg_lc_medres34_bn260428598.gif POS_MAP_URL: http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_799078840.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. ////////////////////////////////////////////////////////////////////// TITLE: GCN/FERMI NOTICE NOTICE_DATE: Tue 28 Apr 26 14:21:58 UT NOTICE_TYPE: Fermi-GBM Ground Position RECORD_NUM: 1 TRIGGER_NUM: 799078840 GRB_RA: 276.950d {+18h 27m 48s} (J2000), 277.283d {+18h 29m 08s} (current), 276.318d {+18h 25m 16s} (1950) GRB_DEC: +1.870d {+01d 52' 12"} (J2000), +1.888d {+01d 53' 17"} (current), +1.838d {+01d 50' 16"} (1950) GRB_ERROR: 2.89 [deg radius, statistical only] DATA_SIGNIF: 33.30 [sigma] DATA_INTERVAL: 3.072 [sec] GRB_DATE: 21158 TJD; 118 DOY; 26/04/28 GRB_TIME: 51635.68 SOD {14:20:35.68} UT GRB_PHI: 242.00 [deg] GRB_THETA: 88.00 [deg] E_RANGE: 44.032 - 279.965 [keV] LOC_ALGORITHM: 41731 (Gnd S/W Version number) SUN_POSTN: 35.94d {+02h 23m 46s} +14.28d {+14d 16' 32"} SUN_DIST: 117.16 [deg] Sun_angle= 7.9 [hr] (West of Sun) MOON_POSTN: 181.56d {+12h 06m 13s} -3.10d {-03d 06' 05"} MOON_DIST: 95.82 [deg] MOON_ILLUM: 91 [%] GAL_COORDS: 31.90, 6.11 [deg] galactic lon,lat of the burst (or transient) ECL_COORDS: 277.68, 25.12 [deg] ecliptic lon,lat of the burst (or transient) LC_URL: http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260428598/quicklook/glg_lc_medres34_bn260428598.gif POS_MAP_URL: http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_799078840.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. ////////////////////////////////////////////////////////////////////// TITLE: GCN/FERMI NOTICE NOTICE_DATE: Tue 28 Apr 26 14:22:33 UT NOTICE_TYPE: Fermi-GBM Ground Position RECORD_NUM: 2 TRIGGER_NUM: 799078840 GRB_RA: 279.400d {+18h 37m 36s} (J2000), 279.738d {+18h 38m 57s} (current), 278.758d {+18h 35m 02s} (1950) GRB_DEC: -0.190d {-00d 11' 23"} (J2000), -0.166d {-00d 09' 55"} (current), -0.234d {-00d 14' 01"} (1950) GRB_ERROR: 2.00 [deg radius, statistical only] DATA_SIGNIF: 31.90 [sigma] DATA_INTERVAL: 6.144 [sec] GRB_DATE: 21158 TJD; 118 DOY; 26/04/28 GRB_TIME: 51635.68 SOD {14:20:35.68} UT GRB_PHI: 243.00 [deg] GRB_THETA: 91.00 [deg] E_RANGE: 44.032 - 279.965 [keV] LOC_ALGORITHM: 41731 (Gnd S/W Version number) SUN_POSTN: 35.94d {+02h 23m 46s} +14.28d {+14d 16' 32"} SUN_DIST: 115.38 [deg] Sun_angle= 7.7 [hr] (West of Sun) MOON_POSTN: 181.56d {+12h 06m 15s} -3.10d {-03d 06' 13"} MOON_DIST: 98.16 [deg] MOON_ILLUM: 91 [%] GAL_COORDS: 31.18, 2.99 [deg] galactic lon,lat of the burst (or transient) ECL_COORDS: 280.21, 22.92 [deg] ecliptic lon,lat of the burst (or transient) LC_URL: http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260428598/quicklook/glg_lc_medres34_bn260428598.gif POS_MAP_URL: http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_799078840.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. ////////////////////////////////////////////////////////////////////// TITLE: GCN/FERMI NOTICE NOTICE_DATE: Tue 28 Apr 26 14:29:55 UT NOTICE_TYPE: Fermi-GBM Final Position RECORD_NUM: 0 TRIGGER_NUM: 799078840 GRB_RA: 276.950d {+18h 27m 48s} (J2000), 277.283d {+18h 29m 08s} (current), 276.318d {+18h 25m 16s} (1950) GRB_DEC: +1.870d {+01d 52' 12"} (J2000), +1.888d {+01d 53' 17"} (current), +1.838d {+01d 50' 16"} (1950) GRB_ERROR: 2.12 [deg radius, statistical only] GRB_DATE: 21158 TJD; 118 DOY; 26/04/28 GRB_TIME: 51635.68 SOD {14:20:35.68} UT GRB_PHI: 242.00 [deg] GRB_THETA: 88.00 [deg] E_RANGE: 44.032 - 279.965 [keV] LOC_ALGORITHM: 41731 (Gnd S/W Version number) SUN_POSTN: 35.95d {+02h 23m 48s} +14.28d {+14d 16' 38"} SUN_DIST: 117.16 [deg] Sun_angle= 7.9 [hr] (West of Sun) MOON_POSTN: 181.62d {+12h 06m 28s} -3.13d {-03d 08' 02"} MOON_DIST: 95.76 [deg] MOON_ILLUM: 91 [%] GAL_COORDS: 31.90, 6.11 [deg] galactic lon,lat of the burst (or transient) ECL_COORDS: 277.68, 25.12 [deg] ecliptic lon,lat of the burst (or transient) LC_URL: http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260428598/quicklook/glg_lc_medres34_bn260428598.gif LOC_URL: http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2026/bn260428598/quicklook/glg_locplot_all_bn260428598.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.