(All information courtesy of the instrument teams.)
Previous IAU Circulars
TITLE: GCN/SWIFT NOTICE NOTICE_DATE: Sat 19 Sep 20 01:53:04 UT NOTICE_TYPE: Swift-BAT GRB Position TRIGGER_NUM: 996503, Seg_Num: 0 GRB_RA: 168.916d {+11h 15m 40s} (J2000), 169.195d {+11h 16m 47s} (current), 168.240d {+11h 12m 58s} (1950) GRB_DEC: +32.457d {+32d 27' 25"} (J2000), +32.344d {+32d 20' 37"} (current), +32.730d {+32d 43' 47"} (1950) GRB_ERROR: 3.00 [arcmin radius, statistical only] GRB_INTEN: 11834 [cnts] Image_Peak=379 [image_cnts] TRIGGER_DUR: 4.096 [sec] TRIGGER_INDEX: 298 E_range: 25-100 keV BKG_INTEN: 98883 [cnts] BKG_TIME: 6686.34 SOD {01:51:26.34} UT BKG_DUR: 40 [sec] GRB_DATE: 19111 TJD; 263 DOY; 20/09/19 GRB_TIME: 6740.93 SOD {01:52:20.93} UT GRB_PHI: -120.97 [deg] GRB_THETA: 25.26 [deg] SOLN_STATUS: 0x3 RATE_SIGNIF: 14.45 [sigma] IMAGE_SIGNIF: 9.51 [sigma] MERIT_PARAMS: +1 +0 +0 +2 +2 +0 -100 +0 -84 +0 SUN_POSTN: 176.88d {+11h 47m 30s} +1.35d {+01d 21' 10"} SUN_DIST: 31.82 [deg] Sun_angle= 0.5 [hr] (West of Sun) MOON_POSTN: 199.52d {+13h 18m 05s} -3.34d {-03d 20' 19"} MOON_DIST: 45.83 [deg] MOON_ILLUM: 4 [%] GAL_COORDS: 192.73, 68.60 [deg] galactic lon,lat of the burst (or transient) ECL_COORDS: 156.37, 25.33 [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 = 127.69,18.89 [deg].
TITLE: GCN/SWIFT NOTICE NOTICE_DATE: Sat 19 Sep 20 01:56:32 UT NOTICE_TYPE: Swift-BAT GRB Lightcurve TRIGGER_NUM: 996503, Seg_Num: 0 GRB_RA: 168.916d {+11h 15m 40s} (J2000), 169.195d {+11h 16m 47s} (current), 168.240d {+11h 12m 58s} (1950) GRB_DEC: +32.457d {+32d 27' 25"} (J2000), +32.344d {+32d 20' 37"} (current), +32.730d {+32d 43' 47"} (1950) GRB_DATE: 19111 TJD; 263 DOY; 20/09/19 GRB_TIME: 6740.93 SOD {01:52:20.93} UT TRIGGER_INDEX: 298 GRB_PHI: -120.97 [deg] GRB_THETA: 25.26 [deg] DELTA_TIME: -18.00 [sec] TRIGGER_DUR: 4.096 [sec] SOLN_STATUS: 0x3 RATE_SIGNIF: 14.45 [sigma] IMAGE_SIGNIF: 9.51 [sigma] LC_URL: sw00996503000msb.lc SUN_POSTN: 176.88d {+11h 47m 31s} +1.35d {+01d 21' 06"} SUN_DIST: 31.83 [deg] Sun_angle= 0.5 [hr] (West of Sun) MOON_POSTN: 199.55d {+13h 18m 13s} -3.35d {-03d 21' 13"} MOON_DIST: 45.86 [deg] MOON_ILLUM: 4 [%] GAL_COORDS: 192.73, 68.60 [deg] galactic lon,lat of the burst (or transient) ECL_COORDS: 156.37, 25.33 [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 = 127.69,18.89 [deg].
RA(J2000) = 11h 15m 40s Dec(J2000) = +32d 27' 25"with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a single complex peak structure with a duration of about 40 sec. The peak count rate was ~1600 counts/sec (15-350 keV), at ~0 sec after the trigger.
Tmid-T0 | Site |Filt.| Expt. | Limit| Comment _________|_____________________|_____|_______|______|________ 93 | MASTER-Tavrida | C | 20 | 16.3 | 118 | MASTER-Tavrida | C | 70 | 16.9 | Coadd 134 | MASTER-Tavrida | C | 20 | 16.3 | 179 | MASTER-Tavrida | C | 30 | 16.3 | 235 | MASTER-Tavrida | C | 40 | 16.8 | 300 | MASTER-Tavrida | C | 50 | 16.9 | 381 | MASTER-Tavrida | C | 70 | 17.1 |Filter C is a clear (unfiltred) band.
RA(J2000) = 11h 15m 35.7s Dec(J2000) = +32d 27' 21.8"with an uncertainty of 1.3 arcmin, (radius, sys+stat, 90% containment). The partial coding was 62%.
Date UT start t-T0 Filter Exp. OT Err. UL (mid, days) (s) 2020-09-19 02:26:25 0.02541 R 30*10 n/d n/d 19.8The photometry is based on nearby USNO-B1.0 stars
USNO-B1.0_id R2 1224-0243383 15.75 1224-0243414 15.12