(All information courtesy of the instrument teams.)
Previous IAU Circulars
TITLE: GCN/FERMI NOTICE NOTICE_DATE: Tue 27 Apr 21 04:57:46 UT NOTICE_TYPE: Fermi-GBM Flight Position RECORD_NUM: 59 TRIGGER_NUM: 641192237 GRB_RA: 168.183d {+11h 12m 44s} (J2000), 168.424d {+11h 13m 42s} (current), 167.621d {+11h 10m 29s} (1950) GRB_DEC: -53.250d {-53d 15' 00"} (J2000), -53.366d {-53d 21' 57"} (current), -52.978d {-52d 58' 39"} (1950) GRB_ERROR: 5.83 [deg radius, statistical plus systematic] GRB_INTEN: 338 [cnts/sec] DATA_SIGNIF: 15.60 [sigma] INTEG_TIME: 4.096 [sec] GRB_DATE: 19331 TJD; 117 DOY; 21/04/27 GRB_TIME: 17832.99 SOD {04:57:12.99} UT GRB_PHI: 170.00 [deg] GRB_THETA: 150.00 [deg] DATA_TIME_SCALE: 4.0960 [sec] HARD_RATIO: 0.30 LOC_ALGORITHM: 3 (version number of) MOST_LIKELY: 94% GRB 2nd_MOST_LIKELY: 3% Generic Transient DETECTORS: 0,1,0, 0,0,0, 1,0,0, 0,0,1, 0,0, SUN_POSTN: 34.82d {+02h 19m 17s} +13.90d {+13d 54' 12"} SUN_DIST: 126.32 [deg] Sun_angle= -8.9 [hr] (East of Sun) MOON_POSTN: 216.67d {+14h 26m 41s} -11.54d {-11d 32' 08"} MOON_DIST: 56.65 [deg] MOON_ILLUM: 100 [%] GAL_COORDS: 288.36, 6.81 [deg] galactic lon,lat of the burst (or transient) ECL_COORDS: 199.41,-51.62 [deg] ecliptic lon,lat of the burst (or transient) LC_URL: http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn210427206/quicklook/glg_lc_medres34_bn210427206.gif COMMENTS: Fermi-GBM Flight-calculated Coordinates. COMMENTS: This trigger occurred at longitude,latitude = 329.58,18.38 [deg]. COMMENTS: The LC_URL file will not be created until ~15 min after the trigger.
TITLE: GCN/FERMI NOTICE NOTICE_DATE: Tue 27 Apr 21 04:57:37 UT NOTICE_TYPE: Fermi-GBM Flight Position RECORD_NUM: 47 TRIGGER_NUM: 641192237 GRB_RA: 168.167d {+11h 12m 40s} (J2000), 168.407d {+11h 13m 38s} (current), 167.604d {+11h 10m 25s} (1950) GRB_DEC: -53.383d {-53d 22' 59"} (J2000), -53.500d {-53d 29' 57"} (current), -53.111d {-53d 06' 39"} (1950) GRB_ERROR: 6.98 [deg radius, statistical plus systematic] GRB_INTEN: 409 [cnts/sec] DATA_SIGNIF: 9.30 [sigma] INTEG_TIME: 1.024 [sec] GRB_DATE: 19331 TJD; 117 DOY; 21/04/27 GRB_TIME: 17832.99 SOD {04:57:12.99} UT GRB_PHI: 170.00 [deg] GRB_THETA: 150.00 [deg] DATA_TIME_SCALE: 1.0240 [sec] HARD_RATIO: 0.40 LOC_ALGORITHM: 3 (version number of) MOST_LIKELY: 93% GRB 2nd_MOST_LIKELY: 4% Generic Transient DETECTORS: 0,1,0, 0,0,0, 1,0,0, 0,0,1, 0,0, SUN_POSTN: 34.82d {+02h 19m 17s} +13.90d {+13d 54' 11"} SUN_DIST: 126.24 [deg] Sun_angle= -8.9 [hr] (East of Sun) MOON_POSTN: 216.67d {+14h 26m 40s} -11.54d {-11d 32' 06"} MOON_DIST: 56.72 [deg] MOON_ILLUM: 100 [%] GAL_COORDS: 288.40, 6.68 [deg] galactic lon,lat of the burst (or transient) ECL_COORDS: 199.53,-51.73 [deg] ecliptic lon,lat of the burst (or transient) LC_URL: http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn210427206/quicklook/glg_lc_medres34_bn210427206.gif COMMENTS: Fermi-GBM Flight-calculated Coordinates. COMMENTS: This trigger occurred at longitude,latitude = 329.58,18.38 [deg]. COMMENTS: The LC_URL file will not be created until ~15 min after the trigger.
TITLE: GCN/FERMI NOTICE NOTICE_DATE: Tue 27 Apr 21 04:57:56 UT NOTICE_TYPE: Fermi-GBM Ground Position RECORD_NUM: 58 TRIGGER_NUM: 641192237 GRB_RA: 172.990d {+11h 31m 58s} (J2000), 173.244d {+11h 32m 59s} (current), 172.397d {+11h 29m 35s} (1950) GRB_DEC: -53.520d {-53d 31' 11"} (J2000), -53.638d {-53d 38' 15"} (current), -53.244d {-53d 14' 37"} (1950) GRB_ERROR: 1.90 [deg radius, statistical only] DATA_SIGNIF: 13.90 [sigma] DATA_INTERVAL: 2.048 [sec] GRB_DATE: 19331 TJD; 117 DOY; 21/04/27 GRB_TIME: 17832.99 SOD {04:57:12.99} UT GRB_PHI: 174.00 [deg] GRB_THETA: 148.00 [deg] E_RANGE: 44.032 - 279.965 [keV] LOC_ALGORITHM: 4173 (Gnd S/W Version number) SUN_POSTN: 34.82d {+02h 19m 17s} +13.90d {+13d 54' 12"} SUN_DIST: 128.61 [deg] Sun_angle= -9.2 [hr] (East of Sun) MOON_POSTN: 216.67d {+14h 26m 41s} -11.54d {-11d 32' 11"} MOON_DIST: 54.34 [deg] MOON_ILLUM: 100 [%] GAL_COORDS: 291.17, 7.53 [deg] galactic lon,lat of the burst (or transient) ECL_COORDS: 203.23,-50.05 [deg] ecliptic lon,lat of the burst (or transient) LC_URL: http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn210427206/quicklook/glg_lc_medres34_bn210427206.gif POS_MAP_URL: http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_641192237.fits COMMENTS: Fermi-GBM Ground-calculated Coordinates. COMMENTS: Bright hard burst in the GBM. 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 27 Apr 21 04:58:31 UT NOTICE_TYPE: Fermi-GBM Ground Position RECORD_NUM: 0 TRIGGER_NUM: 641192237 GRB_RA: 171.800d {+11h 27m 12s} (J2000), 172.051d {+11h 28m 12s} (current), 171.213d {+11h 24m 51s} (1950) GRB_DEC: -52.810d {-52d 48' 35"} (J2000), -52.928d {-52d 55' 38"} (current), -52.535d {-52d 32' 04"} (1950) GRB_ERROR: 1.13 [deg radius, statistical only] DATA_SIGNIF: 17.70 [sigma] DATA_INTERVAL: 5.120 [sec] GRB_DATE: 19331 TJD; 117 DOY; 21/04/27 GRB_TIME: 17832.99 SOD {04:57:12.99} UT GRB_PHI: 172.00 [deg] GRB_THETA: 148.00 [deg] E_RANGE: 44.032 - 279.965 [keV] LOC_ALGORITHM: 41731 (Gnd S/W Version number) SUN_POSTN: 34.82d {+02h 19m 17s} +13.90d {+13d 54' 12"} SUN_DIST: 128.41 [deg] Sun_angle= -9.1 [hr] (East of Sun) MOON_POSTN: 216.68d {+14h 26m 42s} -11.54d {-11d 32' 19"} MOON_DIST: 54.55 [deg] MOON_ILLUM: 100 [%] GAL_COORDS: 290.26, 7.98 [deg] galactic lon,lat of the burst (or transient) ECL_COORDS: 201.68,-49.92 [deg] ecliptic lon,lat of the burst (or transient) LC_URL: http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn210427206/quicklook/glg_lc_medres34_bn210427206.gif POS_MAP_URL: http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_641192237.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 27 Apr 21 04:59:08 UT NOTICE_TYPE: Fermi-GBM Ground Position RECORD_NUM: 3 TRIGGER_NUM: 641192237 GRB_RA: 174.240d {+11h 36m 58s} (J2000), 174.498d {+11h 37m 59s} (current), 173.638d {+11h 34m 33s} (1950) GRB_DEC: -52.690d {-52d 41' 23"} (J2000), -52.808d {-52d 48' 28"} (current), -52.413d {-52d 24' 46"} (1950) GRB_ERROR: 1.00 [deg radius, statistical only] DATA_SIGNIF: 26.60 [sigma] DATA_INTERVAL: 18.432 [sec] GRB_DATE: 19331 TJD; 117 DOY; 21/04/27 GRB_TIME: 17832.99 SOD {04:57:12.99} UT GRB_PHI: 174.00 [deg] GRB_THETA: 147.00 [deg] E_RANGE: 44.032 - 279.965 [keV] LOC_ALGORITHM: 41731 (Gnd S/W Version number) SUN_POSTN: 34.82d {+02h 19m 17s} +13.90d {+13d 54' 13"} SUN_DIST: 129.70 [deg] Sun_angle= -9.3 [hr] (East of Sun) MOON_POSTN: 216.68d {+14h 26m 44s} -11.54d {-11d 32' 28"} MOON_DIST: 53.26 [deg] MOON_ILLUM: 100 [%] GAL_COORDS: 291.65, 8.54 [deg] galactic lon,lat of the burst (or transient) ECL_COORDS: 203.37,-48.93 [deg] ecliptic lon,lat of the burst (or transient) LC_URL: http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn210427206/quicklook/glg_lc_medres34_bn210427206.gif POS_MAP_URL: http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_641192237.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 27 Apr 21 05:06:40 UT NOTICE_TYPE: Fermi-GBM Final Position RECORD_NUM: 0 TRIGGER_NUM: 641192237 GRB_RA: 177.320d {+11h 49m 17s} (J2000), 177.586d {+11h 50m 21s} (current), 176.699d {+11h 46m 48s} (1950) GRB_DEC: -53.360d {-53d 21' 35"} (J2000), -53.479d {-53d 28' 42"} (current), -53.082d {-53d 04' 54"} (1950) GRB_ERROR: 1.14 [deg radius, statistical only] GRB_DATE: 19331 TJD; 117 DOY; 21/04/27 GRB_TIME: 17832.99 SOD {04:57:12.99} UT GRB_PHI: 177.00 [deg] GRB_THETA: 146.00 [deg] E_RANGE: 44.032 - 279.965 [keV] LOC_ALGORITHM: 41731 (Gnd S/W Version number) SUN_POSTN: 34.83d {+02h 19m 19s} +13.91d {+13d 54' 19"} SUN_DIST: 130.77 [deg] Sun_angle= -9.5 [hr] (East of Sun) MOON_POSTN: 216.76d {+14h 27m 02s} -11.57d {-11d 34' 19"} MOON_DIST: 52.18 [deg] MOON_ILLUM: 100 [%] GAL_COORDS: 293.63, 8.39 [deg] galactic lon,lat of the burst (or transient) ECL_COORDS: 206.22,-48.36 [deg] ecliptic lon,lat of the burst (or transient) LC_URL: http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn210427206/quicklook/glg_lc_medres34_bn210427206.gif LOC_URL: http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn210427206/quicklook/glg_locplot_all_bn210427206.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.
Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 93 | 2021-04-27 04:58:36 | MASTER-OAFA | (11h 30m 41.80s , -52d 41m 19.0s) | C | 20 | 16.8 | 149 | 2021-04-27 04:59:26 | MASTER-OAFA | (11h 35m 39.45s , -51d 53m 30.7s) | C | 30 | 17.0 | 203 | 2021-04-27 05:00:15 | MASTER-OAFA | (11h 35m 46.94s , -51d 53m 27.2s) | C | 40 | 17.1 | 267 | 2021-04-27 05:01:15 | MASTER-OAFA | (11h 35m 42.92s , -51d 51m 45.2s) | C | 50 | 17.2 | 342 | 2021-04-27 05:02:25 | MASTER-OAFA | (11h 35m 42.91s , -51d 53m 27.9s) | C | 60 | 17.3 | 432 | 2021-04-27 05:03:45 | MASTER-OAFA | (11h 35m 45.38s , -51d 51m 52.5s) | C | 80 | 17.4 | 542 | 2021-04-27 05:05:24 | MASTER-OAFA | (11h 35m 40.74s , -51d 52m 31.1s) | C | 100 | 17.5 | 671 | 2021-04-27 05:07:24 | MASTER-OAFA | (11h 47m 58.15s , -52d 31m 41.5s) | C | 120 | 17.3 |Filter C is a clear (unfiltred) band.
RA(2000.0) = 172.6+/-2.5 deg Decl.(2000.0) = -54.4+/-1.7 degWe estimate an additional systematic error of 1 deg.
ra: 175.26 deg dec: -59.87 deg err: 5.75 deg (statistical only)The current systematic error of location is estimated to be several degrees which could be minimized by the ongoing calibration.
--------------------------------------------- RA(2000), deg Dec(2000), deg --------------------------------------------- Center: 177.792 (11h 51m 10s) -52.866 (-52d 51' 57") Corners: 176.862 (11h 47m 27s) -54.591 (-54d 35' 28") 176.750 (11h 47m 00s) -54.533 (-54d 31' 59") 178.678 (11h 54m 43s) -51.138 (-51d 08' 18") 178.782 (11h 55m 08s) -51.196 (-51d 11' 46") ---------------------------------------------The error box area is 1036 sq. arcmin, and its maximum dimension is 3.6 deg (the minimum one is 4.8 arcmin). The Sun distance was 93 deg.