Gamma-ray Burst 190324A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

none

Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 24 Mar 19 22:44:35 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     894718,   Seg_Num: 0
GRB_RA:           49.576d {+03h 18m 18s} (J2000),
                  49.735d {+03h 18m 56s} (current),
                  49.165d {+03h 16m 40s} (1950)
GRB_DEC:         -47.239d {-47d 14' 21"} (J2000),
                 -47.170d {-47d 10' 12"} (current),
                 -47.421d {-47d 25' 14"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       4183 [cnts]    Image_Peak=184 [image_cnts]
TRIGGER_DUR:     2.048 [sec] 
TRIGGER_INDEX:   264     E_range: 25-100 keV
BKG_INTEN:       39738 [cnts]
BKG_TIME:        81809.37 SOD {22:43:29.37} UT
BKG_DUR:         24 [sec]
GRB_DATE:        18566 TJD;    83 DOY;   19/03/24
GRB_TIME:        81841.63 SOD {22:44:01.63} UT
GRB_PHI:         -64.21 [deg]
GRB_THETA:        29.24 [deg]
SOLN_STATUS:     0x20000003
RATE_SIGNIF:     13.19 [sigma]
IMAGE_SIGNIF:    8.57 [sigma]
MERIT_PARAMS:     +1  +0  +0  +1  +2  -1  +0  +0 -45  +0 
SUN_POSTN:         3.68d {+00h 14m 42s}   +1.59d {+01d 35' 29"}
SUN_DIST:         63.18 [deg]   Sun_angle= -3.1 [hr] (East of Sun)
MOON_POSTN:      234.69d {+15h 38m 45s}  -15.05d {-15d 02' 52"}
MOON_DIST:       117.62 [deg]
MOON_ILLUM:      81 [%]
GAL_COORDS:      257.89,-55.00 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       22.48,-61.55 [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 = 345.97,-10.96 [deg].  
COMMENTS:           
COMMENTS:        NOTE: This BAT event is temporally(15.0<100sec) coincident with the CALET_GBM event (trignum=1237502436).

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Sun 24 Mar 19 22:44:07 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      47
TRIGGER_NUM:     575160247
GRB_RA:           57.700d {+03h 50m 48s} (J2000),
                  57.885d {+03h 51m 32s} (current),
                  57.220d {+03h 48m 53s} (1950)
GRB_DEC:         -34.317d {-34d 19' 00"} (J2000),
                 -34.260d {-34d 15' 34"} (current),
                 -34.466d {-34d 27' 58"} (1950)
GRB_ERROR:       27.23 [deg radius, statistical plus systematic]
GRB_INTEN:       72 [cnts/sec]
DATA_SIGNIF:     4.70 [sigma]
INTEG_TIME:      2.048 [sec]
GRB_DATE:        18566 TJD;    83 DOY;   19/03/24
GRB_TIME:        81842.64 SOD {22:44:02.64} UT
GRB_PHI:         225.00 [deg]
GRB_THETA:        20.00 [deg]
DATA_TIME_SCALE: 2.0480 [sec]
HARD_RATIO:      1.21
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      87%  GRB
2nd_MOST_LIKELY:   7%  Distant Particles
DETECTORS:       0,0,0, 0,0,0, 1,1,0, 0,0,0, 0,0,
SUN_POSTN:         3.67d {+00h 14m 42s}   +1.59d {+01d 35' 28"}
SUN_DIST:         62.13 [deg]   Sun_angle= -3.6 [hr] (East of Sun)
MOON_POSTN:      234.68d {+15h 38m 44s}  -15.05d {-15d 02' 47"}
MOON_DIST:       130.60 [deg]
MOON_ILLUM:      81 [%]
GAL_COORDS:      234.88,-51.10 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       43.33,-52.65 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn190324947/quicklook/glg_lc_medres34_bn190324947.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 242.13,22.90 [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 24 Mar 19 22:44:31 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      70
TRIGGER_NUM:     575160247
GRB_RA:           49.800d {+03h 19m 12s} (J2000),
                  49.911d {+03h 19m 39s} (current),
                  49.513d {+03h 18m 03s} (1950)
GRB_DEC:         -58.917d {-58d 55' 00"} (J2000),
                 -58.848d {-58d 50' 51"} (current),
                 -59.097d {-59d 05' 48"} (1950)
GRB_ERROR:       5.85 [deg radius, statistical plus systematic]
GRB_INTEN:       696 [cnts/sec]
DATA_SIGNIF:     66.90 [sigma]
INTEG_TIME:      4.096 [sec]
GRB_DATE:        18566 TJD;    83 DOY;   19/03/24
GRB_TIME:        81842.64 SOD {22:44:02.64} UT
GRB_PHI:         156.00 [deg]
GRB_THETA:        25.00 [deg]
DATA_TIME_SCALE: 4.0960 [sec]
HARD_RATIO:      0.66
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      84%  GRB
2nd_MOST_LIKELY:  12%  Distant Particles
DETECTORS:       0,0,0, 0,0,0, 1,1,0, 0,0,0, 0,0,
SUN_POSTN:         3.67d {+00h 14m 42s}   +1.59d {+01d 35' 29"}
SUN_DIST:         70.49 [deg]   Sun_angle= -3.1 [hr] (East of Sun)
MOON_POSTN:      234.69d {+15h 38m 45s}  -15.05d {-15d 02' 51"}
MOON_DIST:       106.00 [deg]
MOON_ILLUM:      81 [%]
GAL_COORDS:      274.54,-49.27 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:        3.63,-70.49 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn190324947/quicklook/glg_lc_medres34_bn190324947.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 242.13,22.90 [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 24 Mar 19 22:44:16 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      57
TRIGGER_NUM:     575160247
GRB_RA:           63.000d {+04h 12m 00s} (J2000),
                  63.178d {+04h 12m 43s} (current),
                  62.538d {+04h 10m 09s} (1950)
GRB_DEC:         -35.800d {-35d 47' 59"} (J2000),
                 -35.752d {-35d 45' 05"} (current),
                 -35.927d {-35d 55' 38"} (1950)
GRB_ERROR:       15.99 [deg radius, statistical only]
DATA_SIGNIF:     5.50 [sigma]
DATA_INTERVAL:   2.048 [sec]
GRB_DATE:        18566 TJD;    83 DOY;   19/03/24
GRB_TIME:        81842.64 SOD {22:44:02.64} UT
GRB_PHI:         219.00 [deg]
GRB_THETA:        24.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   4153 (Gnd S/W Version number)
SUN_POSTN:         3.67d {+00h 14m 42s}   +1.59d {+01d 35' 28"}
SUN_DIST:         66.70 [deg]   Sun_angle= -4.0 [hr] (East of Sun)
MOON_POSTN:      234.68d {+15h 38m 44s}  -15.05d {-15d 02' 49"}
MOON_DIST:       128.57 [deg]
MOON_ILLUM:      81 [%]
GAL_COORDS:      237.42,-46.83 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       49.45,-55.50 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn190324947/quicklook/glg_lc_medres34_bn190324947.gif
POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_575160247.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.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Sun 24 Mar 19 22:44:24 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      67
TRIGGER_NUM:     575160247
GRB_RA:           49.600d {+03h 18m 24s} (J2000),
                  49.711d {+03h 18m 51s} (current),
                  49.312d {+03h 17m 15s} (1950)
GRB_DEC:         -58.933d {-58d 55' 59"} (J2000),
                 -58.864d {-58d 51' 49"} (current),
                 -59.114d {-59d 06' 50"} (1950)
GRB_ERROR:       4.90 [deg radius, statistical plus systematic]
GRB_INTEN:       587 [cnts/sec]
DATA_SIGNIF:     28.40 [sigma]
INTEG_TIME:      1.024 [sec]
GRB_DATE:        18566 TJD;    83 DOY;   19/03/24
GRB_TIME:        81842.64 SOD {22:44:02.64} UT
GRB_PHI:         156.00 [deg]
GRB_THETA:        25.00 [deg]
DATA_TIME_SCALE: 1.0240 [sec]
HARD_RATIO:      0.61
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      86%  GRB
2nd_MOST_LIKELY:  10%  Distant Particles
DETECTORS:       0,0,0, 0,0,0, 1,1,0, 0,0,0, 0,0,
SUN_POSTN:         3.67d {+00h 14m 42s}   +1.59d {+01d 35' 29"}
SUN_DIST:         70.42 [deg]   Sun_angle= -3.1 [hr] (East of Sun)
MOON_POSTN:      234.68d {+15h 38m 44s}  -15.05d {-15d 02' 50"}
MOON_DIST:       105.98 [deg]
MOON_ILLUM:      81 [%]
GAL_COORDS:      274.65,-49.34 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:        3.39,-70.43 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn190324947/quicklook/glg_lc_medres34_bn190324947.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 242.13,22.90 [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 24 Mar 19 22:53:15 UT
NOTICE_TYPE:     Fermi-GBM Final Position
RECORD_NUM:      0
TRIGGER_NUM:     575160247
GRB_RA:           50.930d {+03h 23m 43s} (J2000),
                  51.085d {+03h 24m 20s} (current),
                  50.528d {+03h 22m 07s} (1950)
GRB_DEC:         -47.830d {-47d 49' 47"} (J2000),
                 -47.763d {-47d 45' 45"} (current),
                 -48.006d {-48d 00' 21"} (1950)
GRB_ERROR:       1.00 [deg radius, statistical only]
GRB_DATE:        18566 TJD;    83 DOY;   19/03/24
GRB_TIME:        81842.64 SOD {22:44:02.64} UT
GRB_PHI:         178.00 [deg]
GRB_THETA:        17.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   41531 (Gnd S/W Version number)
SUN_POSTN:         3.68d {+00h 14m 43s}   +1.59d {+01d 35' 37"}
SUN_DIST:         64.27 [deg]   Sun_angle= -3.2 [hr] (East of Sun)
MOON_POSTN:      234.77d {+15h 39m 04s}  -15.07d {-15d 04' 12"}
MOON_DIST:       117.08 [deg]
MOON_ILLUM:      81 [%]
GAL_COORDS:      258.25,-53.93 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       23.43,-62.54 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn190324947/quicklook/glg_lc_medres34_bn190324947.gif
LOC_URL:         http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn190324947/quicklook/glg_locplot_all_bn190324947.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(16.0<100sec) coincident with the INTEGRAL_SPIACS event (trignum=8240).

GCN NOTICE

 
TITLE:          GCN/INTEGRAL NOTICE
NOTICE_DATE:    Sun 24 Mar 19 22:45:15 UT
NOTICE_TYPE:    INTEGRAL SPI ACS Trigger
TRIGGER_NUM:    8240,   Sub_Num: 0
GRB_INTEN:      9.55 [sigma]   
GRB_TIME:       81858.94 SOD {22:44:18.94} UT
GRB_DATE:       18566 TJD;    83 DOY;   19/03/24
COMMENTS:       INTEGRAL SPI_ACS GRB Trigger.
COMMENTS:       Time_Scale=2.0000 and Time_Error=1.0000.
COMMENTS:
COMMENTS:       NOTE: This SPIACS event is temporally(17.0<100sec) coincident with the SWIFT_BAT event (trignum=894718). 
COMMENTS:
COMMENTS:       The SPIACS lightcurve can be found at:
COMMENTS:       ftp://isdcarc.unige.ch/arc/FTP/ibas/spiacs/2019-03/2019-03-24T22-44-18.7537-07200-56208-0.lc

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 24 Mar 19 22:47:49 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     894718,   Seg_Num: 0
GRB_RA:           49.576d {+03h 18m 18s} (J2000),
                  49.735d {+03h 18m 56s} (current),
                  49.165d {+03h 16m 40s} (1950)
GRB_DEC:         -47.239d {-47d 14' 21"} (J2000),
                 -47.170d {-47d 10' 12"} (current),
                 -47.421d {-47d 25' 14"} (1950)
GRB_DATE:        18566 TJD;    83 DOY;   19/03/24
GRB_TIME:        81841.63 SOD {22:44:01.63} UT
TRIGGER_INDEX:   264
GRB_PHI:         -64.21 [deg]
GRB_THETA:        29.24 [deg]
DELTA_TIME:      -24.00 [sec]
TRIGGER_DUR:     2.048 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     13.19 [sigma]
IMAGE_SIGNIF:    8.57 [sigma]
LC_URL:          sw00894718000msb.lc
SUN_POSTN:         3.68d {+00h 14m 42s}   +1.59d {+01d 35' 32"}
SUN_DIST:         63.18 [deg]   Sun_angle= -3.1 [hr] (East of Sun)
MOON_POSTN:      234.72d {+15h 38m 52s}  -15.06d {-15d 03' 22"}
MOON_DIST:       117.61 [deg]
MOON_ILLUM:      81 [%]
GAL_COORDS:      257.89,-55.00 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       22.48,-61.55 [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 = 345.97,-10.96 [deg].

GCN Circular #23993
S. J. LaPorte (PSU), S. D. Barthelmy (GSFC), N. J. Klingler (PSU), A. Y. Lien (GSFC/UMBC), M. J. Moss (George Washington University), B. Sbarufatti (PSU) and A. Tohuvavohu (PSU) report on behalf of the Neil Gehrels Swift Observatory Team:
At 22:44:01 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 190324A (trigger=894718). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 49.576, -47.239 which is
```
   RA(J2000) = 03h 18m 18s
   Dec(J2000) = -47d 14' 21"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a precursor at ~T0 and a bright multi-peaked structure starting at ~T+19 s. The total duration is about 40 sec. The peak count rate was ~8000 counts/sec (15-350 keV), at ~21 sec after the trigger.
Due to an observing constraint, Swift will not slew until T0+52.4 minutes. There will be no XRT or UVOT data until this time.
Burst Advocate for this burst is S. J. LaPorte (extragsam AT gmail.com). 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 Circular #23994
F. Kunzweiler, B. Biltzinger, F. Berlato, J. Burgess & J. Greiner (all MPE Garching) report:
The public trigdat data of the Fermi Gamma-ray Burst Monitor (GBM) trigger 575160247 at 22:44:02 on 24 March 2019 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 (1 sigma statistical errors) is:
```
RA(2000.0) = 53.4+/-3.5 deg    
Decl.(2000.0) = -53.7+/-1.4 deg
```
We estimate an additional systematic error of 0 deg.
Further details are available at: https://grb.mpe.mpg.de/grb/GRB190324947/
The Healpix map can be downloaded from: https://grb.mpe.mpg.de/grb/GRB190324947/healpix
The location parameters are available as JSON at: https://grb.mpe.mpg.de/grb/GRB190324947/json

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 24 Mar 19 23:39:08 UT
NOTICE_TYPE:     Swift-XRT Nack-Position
TRIGGER_NUM:     894718,   Seg_Num: 0
POINT_RA:         49.715d {+03h 18m 52s} (J2000)
POINT_DEC:       -47.181d {-47d 10' 52"} (J2000)
IMG_START_DATE:  18566 TJD;    83 DOY;   19/03/24
IMG_START_TIME:  85139.49 SOD {23:38:59.49} UT,   3297.9 [sec] since BAT Trigger Time
COUNTS:          1    Min_needed= 20
STD_DEV:         0.00   Max_StdDev_for_Good=28.44 [arcsec]
PH2_ITER:        0    Max_iter_allowed= 4
ERROR_CODE:      1
COMMENTS:        SWIFT-XRT Nack Position.  
COMMENTS:        No source found in the image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 24 Mar 19 23:43:58 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     894718,   Seg_Num: 0
POINT_RA:         49.715d {+03h 18m 52s} (J2000)
POINT_DEC:       -47.181d {-47d 10' 51"} (J2000)
POINT_ROLL:      306.476d
IMG_START_DATE:  18566 TJD;    83 DOY;   19/03/24
IMG_START_TIME:  85143.95 SOD {23:39:03.95} UT,   3302.3 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        7.197
N_STARS:         16
X_OFFSET:        368 [pixels]
Y_OFFSET:        0 [pixels]
X_MAX:           1327 [pixels]
Y_MAX:           959 [pixels]
DET_THRESH:      23
PHOTO_THRESH:    14
SL_URL:          sw00894718000msufc3302.fits
SUN_POSTN:         3.71d {+00h 14m 51s}   +1.61d {+01d 36' 27"}
SUN_DIST:         63.21 [deg]   Sun_angle= -3.1 [hr] (East of Sun)
MOON_POSTN:      235.24d {+15h 40m 58s}  -15.20d {-15d 11' 58"}
MOON_DIST:       117.50 [deg]
MOON_ILLUM:      81 [%]
GAL_COORDS:      257.73,-54.93 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       22.71,-61.55 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 24 Mar 19 23:42:44 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     894718,   Seg_Num: 0
GRB_RA:           49.6181d {+03h 18m 28.34s} (J2000),
                  49.7764d {+03h 19m 06.32s} (current),
                  49.2067d {+03h 16m 49.61s} (1950)
GRB_DEC:         -47.2109d {-47d 12' 39.2"} (J2000),
                 -47.1417d {-47d 08' 29.9"} (current),
                 -47.3920d {-47d 23' 31.3"} (1950)
GRB_ERROR:       4.3 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  18566 TJD;    83 DOY;   19/03/24
IMG_START_TIME:  85153.00 SOD {23:39:13.00} UT,   3311.4 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:         3.71d {+00h 14m 51s}   +1.61d {+01d 36' 26"}
SUN_DIST:         63.18 [deg]   Sun_angle= -3.1 [hr] (East of Sun)
MOON_POSTN:      235.23d {+15h 40m 55s}  -15.20d {-15d 11' 47"}
MOON_DIST:       117.47 [deg]
MOON_ILLUM:      81 [%]
GAL_COORDS:      257.82,-54.98 [deg] galactic lon,lat of the burst
ECL_COORDS:       22.56,-61.54 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
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 0.58% < P(seren) < 1.1%.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 24 Mar 19 23:44:15 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     894718,   Seg_Num: 0
POINT_RA:         49.715d {+03h 18m 52s} (J2000)
POINT_DEC:       -47.181d {-47d 10' 51"} (J2000)
POINT_ROLL:      306.476d
IMG_START_DATE:  18566 TJD;    83 DOY;   19/03/24
IMG_START_TIME:  85143.95 SOD {23:39:03.95} UT,   3302.3 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        7.197
N_STARS:         16
X_OFFSET:        368 [pixels]
Y_OFFSET:        0 [pixels]
X_MAX:           1327 [pixels]
Y_MAX:           959 [pixels]
DET_THRESH:      23
PHOTO_THRESH:    14
SL_URL:          sw00894718000msufc3302.fits
SUN_POSTN:         3.71d {+00h 14m 51s}   +1.61d {+01d 36' 27"}
SUN_DIST:         63.21 [deg]   Sun_angle= -3.1 [hr] (East of Sun)
MOON_POSTN:      235.24d {+15h 40m 58s}  -15.20d {-15d 12' 00"}
MOON_DIST:       117.50 [deg]
MOON_ILLUM:      81 [%]
GAL_COORDS:      257.73,-54.93 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       22.71,-61.55 [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:     Sun 24 Mar 19 23:45:35 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     894718,   Seg_Num: 0
POINT_RA:         49.715d {+03h 18m 52s} (J2000)
POINT_DEC:       -47.181d {-47d 10' 51"} (J2000)
ROLL:            306.476d
IMG_START_DATE:  18566 TJD;    83 DOY;   19/03/24
IMG_START_TIME:  85143.95 SOD {23:39:03.95} UT,   3302.3 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     575163566
X_OFFSET:        687 [pixels]
Y_OFFSET:        319 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       847
Y_GRB_POS:       479
BINNING_INDEX:   1
IM_URL:          sw00894718000msuni3325.fits
SUN_POSTN:         3.71d {+00h 14m 51s}   +1.61d {+01d 36' 29"}
SUN_DIST:         63.21 [deg]   Sun_angle= -3.1 [hr] (East of Sun)
MOON_POSTN:      235.26d {+15h 41m 01s}  -15.20d {-15d 12' 13"}
MOON_DIST:       117.50 [deg]
MOON_ILLUM:      81 [%]
GAL_COORDS:      257.73,-54.93 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       22.71,-61.55 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 24 Mar 19 23:45:46 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     894718,   Seg_Num: 0
POINT_RA:         49.715d {+03h 18m 52s} (J2000)
POINT_DEC:       -47.181d {-47d 10' 51"} (J2000)
ROLL:            306.476d
IMG_START_DATE:  18566 TJD;    83 DOY;   19/03/24
IMG_START_TIME:  85143.95 SOD {23:39:03.95} UT,   3302.3 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     575163566
X_OFFSET:        687 [pixels]
Y_OFFSET:        319 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       847
Y_GRB_POS:       479
BINNING_INDEX:   1
IM_URL:          sw00894718000msuni3325.fits
SUN_POSTN:         3.71d {+00h 14m 51s}   +1.61d {+01d 36' 29"}
SUN_DIST:         63.21 [deg]   Sun_angle= -3.1 [hr] (East of Sun)
MOON_POSTN:      235.26d {+15h 41m 02s}  -15.20d {-15d 12' 14"}
MOON_DIST:       117.50 [deg]
MOON_ILLUM:      81 [%]
GAL_COORDS:      257.73,-54.93 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       22.71,-61.55 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 25 Mar 19 00:15:39 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     894718,   Seg_Num: 0
GRB_RA:           49.6204d {+03h 18m 28.89s} (J2000),
                  49.7787d {+03h 19m 06.87s} (current),
                  49.2090d {+03h 16m 50.16s} (1950)
GRB_DEC:         -47.2121d {-47d 12' 43.5"} (J2000),
                 -47.1429d {-47d 08' 34.3"} (current),
                 -47.3932d {-47d 23' 35.6"} (1950)
GRB_ERROR:       3.6 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  18566 TJD;    83 DOY;   19/03/24
IMG_START_TIME:  85153.00 SOD {23:39:13.00} UT,   3311.4 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:         3.73d {+00h 14m 56s}   +1.62d {+01d 36' 58"}
SUN_DIST:         63.18 [deg]   Sun_angle= -3.1 [hr] (East of Sun)
MOON_POSTN:      235.54d {+15h 42m 09s}  -15.28d {-15d 16' 47"}
MOON_DIST:       117.36 [deg]
MOON_ILLUM:      80 [%]
GAL_COORDS:      257.82,-54.98 [deg] galactic lon,lat of the burst
ECL_COORDS:       22.56,-61.54 [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 0.58% < P(seren) < 1.1%.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 25 Mar 19 00:32:25 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     894718,   Seg_Num: 0
GRB_RA:           49.6203d {+03h 18m 28.87s} (J2000),
                  49.7786d {+03h 19m 06.85s} (current),
                  49.2089d {+03h 16m 50.14s} (1950)
GRB_DEC:         -47.2121d {-47d 12' 43.5"} (J2000),
                 -47.1429d {-47d 08' 34.3"} (current),
                 -47.3932d {-47d 23' 35.6"} (1950)
GRB_ERROR:       3.6 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  18566 TJD;    83 DOY;   19/03/24
IMG_START_TIME:  85153.00 SOD {23:39:13.00} UT,   3311.4 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:         3.74d {+00h 14m 58s}   +1.62d {+01d 37' 15"}
SUN_DIST:         63.18 [deg]   Sun_angle= -3.1 [hr] (East of Sun)
MOON_POSTN:      235.69d {+15h 42m 46s}  -15.32d {-15d 19' 19"}
MOON_DIST:       117.31 [deg]
MOON_ILLUM:      80 [%]
GAL_COORDS:      257.82,-54.98 [deg] galactic lon,lat of the burst
ECL_COORDS:       22.56,-61.54 [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 0.58% < P(seren) < 1.1%.

GCN Circular #23996
V. Lipunov, E. Gorbovskoy, V.Kornilov, D.Kuvshinov, N.Tyurina, P.Balanutsa, A.Kuznetsov, V.V.Chazov, D. Vlasenko Lomonosov Moscow State University, Sternberg Astronomical Institute, Moscow State University
A. Tlatov, V.Senik, A.V. Parhomenko, D. Dormidontov Kislovodsk Solar Station of the Pulkovo Observatory
K. Ivanov, O. Gres, N.M. Budnev, S. Yazev, O. Chuvalaev, V. Poleshchuk Irkutsk State University
V. Yurkov, A. Gabovich, Yu. Sergienko Blagoveschensk Educational State University, Blagoveschensk
R. Podesta, Carlos Lopez and F. Podesta Observatorio Astronomico Felix Aguilar (OAFA)
Hugo Levato and Carlos Saffe Instituto de Ciencias Astronomicas, de la Tierra y del Espacio (ICATE)
R. Rebolo, M. Serra, N. Lodieu, G. Israelian, L. Suarez-Andres The Instituto de Astrofisica de Canarias
D. Buckley, S. Potter, A. Kniazev, M. Kotze South African Astronomical Observatory
MASTER-OAFA robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Argentina (OAFA observatory of San Juan National University) was pointed to the SWIFT GRB190324.95 ( 3h 18m 18.24s , -47d 14m 20.40s, R=0.05) 2541 sec after trigger time at 2019-03-24 23:26:22 UT, with upper limit up to 17.5 mag. Observations started at twilight. The observations began at zenit distance = 45 deg. The sun altitude is -10.4 deg.
The galactic latitude b = -60 deg., longitude l = 98 deg.
We obtain a following upper limits.
```
Tmid-T0  |          Site       |Filt.| Expt. | Limit| Comment
_________|_____________________|_____|_______|______|________

    2632 |         MASTER-OAFA |   C |   180 | 16.2 |
    2812 |         MASTER-OAFA |   C |   540 | 17.5 |  Coadd
```
Filter C is a clear (unfiltred) band.
The observation and reduction will continue. The message may be cited.
GCN Circular #23996
F. E. Marshall (NASA/GSFC) reports on behalf of the Neil Gehrels Swift Observatory team:
UVOT took a finding chart exposure of 150 seconds with the White filter starting 3302 seconds after the BAT trigger (LaPorte et al.GCN Circ. 23993). There is a candidate afterglow in the rapidly available 2.7'x2.7' sub-image at
```
RA(J2000) =	03:18:27.72 = 49.61551
DEC(J2000) = -47:12:52.9 = -47.21469
```
with a 90%-confidence error radius of about 0.75 arc sec. The estimated magnitude is 17.10 with a 1-sigma error of about 0.14. With a single observation, we have no indication whether the source is variable. No correction has been made for the expected extinction corresponding to E(B-V) of 0.02.
GCN Circular #23997
M. Perri (ASDC), G. Tagliaferri (INAF-OAB), P.A. Evans (U. Leicester), J.P. Osborne (U. Leicester), D.N. Burrows (PSU) and J.A. Kennea (PSU) report on behalf of the Swift-XRT team:
The XRT began observing the field of GRB 190324A at 23:38:59.4 UT, 3297.9 seconds after the BAT trigger. Using promptly downlinked data we find an uncatalogued X-ray source located at RA, Dec 49.62054, -47.21240 which is equivalent to:
```
   RA(J2000)  = 03h 18m 28.93s
   Dec(J2000) = -47d 12' 44.6"
```
with an uncertainty of 3.7 arcseconds (radius, 90% containment). This location is 145 arcseconds from the BAT onboard position, within the BAT error circle. This position may be improved as more data are received; the latest position is available at http://www.swift.ac.uk/sper.
A power-law fit to a spectrum formed from promptly downlinked event data gives a column density in excess of the Galactic value (1.75 x 10^20 cm^-2, Willingale et al. 2013), with an excess column of 7 (+3.19/-2.76) x 10^21 cm^-2 (90% confidence).
GCN Circular #23999
D. A. Perley (LJMU), L. Izzo (HETH/IAA-CSIC), D. A. Kann (HETH/IAA-CSIC), D. B. Malesani (DAWN/NBI and DARK/NBI) report on behalf of the Stargate collabaration:
We observed the optical afterglow (Marshall, GCN 23996) of GRB 190324A (LaPorte et al., GCN 23993) using the ESO VLT UT2 (Kueyen) equipped with the X-shooter spectrograph. Our spectra cover the wavelength range 3000-21000 AA, and consist of 2 exposures by 600 seconds each. The observation mid time was 2019 Mar 25.0441 UT (2.324 hr after the GRB).
We detect continuum at high-S/N over the entire covered wavelength range. A multitude of absorption features are detected, including Ca II, Mg II, Mg I, Fe II, Al II, Cr II, all at a common redshift z = 1.1715. In particular, fine structure lines from Fe II* are visible, which confirm the association of the absorption system with the GRB.
We acknowledge excellent support from the ESO observing staff in Paranal, in particular Romain Thomas, Anita Zanella, and Juan Carlos Olivares.
GCN Circular #24001
A.P. Beardmore, P.A. Evans, M.R. Goad and J.P. Osborne (U. Leicester) report on behalf of the Swift-XRT team.
Using 1829 s of XRT Photon Counting mode data and 5 UVOT images for GRB 190324A, 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 = 49.61588, -47.21487 which is equivalent to:
```
RA (J2000): 03h 18m 27.81s
Dec (J2000): -47d 12' 53.5"
```
with an uncertainty of 1.5 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 NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 25 Mar 19 04:17:28 UT
NOTICE_TYPE:     Swift-UVOT Position
TRIGGER_NUM:     894718,   Seg_Num: 0
GRB_RA:           49.6155d {+03h 18m 27.71s} (J2000),
                  49.7738d {+03h 19m 05.70s} (current),
                  49.2041d {+03h 16m 48.99s} (1950)
GRB_DEC:         -47.2146d {-47d 12' 52.5"} (J2000),
                 -47.1454d {-47d 08' 43.2"} (current),
                 -47.3957d {-47d 23' 44.6"} (1950)
GRB_ERROR:       0.8 [arcsec radius, statistical only]
GRB_MAG:         17.10 +/- 0.14 [mag]
FILTER:          10, White
IMG_START_DATE:  18566 TJD;    83 DOY;   19/03/24
IMG_START_TIME:  85140.00 SOD {23:39:00.00} UT,   3298.4 [sec] since BAT Trigger Time
SUN_POSTN:         3.89d {+00h 15m 33s}   +1.68d {+01d 40' 56"}
SUN_DIST:         63.15 [deg]   Sun_angle= -3.1 [hr] (East of Sun)
MOON_POSTN:      237.79d {+15h 51m 10s}  -15.88d {-15d 52' 40"}
MOON_DIST:       116.57 [deg]
MOON_ILLUM:      79 [%]
GAL_COORDS:      257.83,-54.98 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       22.55,-61.54 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT UVOT Position Notice.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        Result based on Genie data.  
COMMENTS:        Notice generated automatically.

GCN Circular #24002
C. M. Hui (MSFC) reports on behalf of the Fermi GBM Team:
At 22:44:02.64 UT on 24 March 2019, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 190324A (trigger 575160247/190324947), which was also detected by Swift (LaPorte e al. 2019, GCN 23993). The GBM on-ground location is consistent with the Swift position.
The GBM light curve shows an initial weak pulse followed by a stronger signal containing two peaks. The duration (T90) is about 26.9 s (50-300 keV). The time-averaged spectrum from T0+15.4 s to T0+32.8 s is adequately fit by a Band function with Epeak = 144.3 +/- 8.4 keV, alpha = -0.84 +/- 0.04, and beta = -2.06 +/- 0.05.
The event fluence (10-1000 keV) in this time interval is (1.78 +/- 0.03)E-05 erg/cm^2. The 1-sec peak photon flux measured starting from T0+22.8 s in the 10-1000 keV band is 18.4 +/- 0.3 ph/s/cm^2.
The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog.
GCN Circular #24003
V. Lipunov, E. Gorbovskoy, N.Tyurina, V.Kornilov, D.Vlasenko, V.Vladimirov, D.Zimnukhov, A.Kuznetsov, P.Balanutsa, A. Chasovnikov, V.Topolev, D.Kuvshinov (Lomonosov Moscow State University, SAI, Physics Department),
R. Podesta, C. Lopez, C.Francile, F. Podesta (Observatorio Astronomico Felix Aguilar OAFA, San Juan National University),
H.Levato (Instituto de Ciencias Astronomicas, de la Tierra y del Espacio ICATE, SJNU)
R. Rebolo, M. Serra, N. Lodieu, G. Israelian, L. Suarez-Andres (The Instituto de Astrofisica de Canarias),
D. Buckley (South African Astronomical Observatory),
O. Gress, N.M. Budnev, O.Ershova, Yu.Ishmuhametova, S.Yazev (Applied Physics Institute, Irkutsk State University),
V. Yurkov, A. Gabovich, Yu. Sergienko, D. Kobcev (Blagoveschensk Educational State University),
A. Tlatov, V.Senik, A.V. Parhomenko, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory),
MASTER-OAFA robotic telescope (Global MASTER-Net http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy,vol. 2010, 30L) located in Argentina (OAFA observatory of San JuanNational University) was pointed to the GRB190324A (LaPorte et al. GCN 23993, Kunzweiler et al. GCN 23994, Perri et al. GCN 23997, Beardmore et al. GCN 24001, Hui et al. GCN 24002) 17 sec after notice time and 252 sec after trigger time at 2019-03-24 22:48:14 UT (Lipunov et al., GCN23995).
The SunAltitude was -1.09, so the GRB optical counterpart (MASTER OT J031827.61-471252.6 +-0.7arcsec) light curve started at 2019-03-24 23:26:22UT (2541 sec after trigger time) with m_OT=17.6 +-0.2(preliminary automatic light curve).
The OT became brighter (17.0) and then shows classical decay.
This OT was also detected by Swift (Marshall et al. GCN 23996), and the spectra was observed by Perley et al. GCN23999).
MASTER-SAAO was pointed 12s after notice time, but the alert altitude was -0.6deg.
Reduction will be continued. The message may be cited.
GCN Circular #24004
A. D'Ai (INAF-IASFPA), A. Melandri (INAF-OAB), P. D'Avanzo (INAF-OAB), A. Tohuvavohu (PSU), S. J. LaPorte (PSU), J.A. Kennea (PSU), A.P. Beardmore (U. Leicester), P.A. Evans (U. Leicester), J.P. Osborne (U. Leicester) and S.J. LaPorte report on behalf of the Swift-XRT team:
We have analysed 6.6 ks of XRT data for GRB 190324A (LaPorte et al. GCN Circ. 23993), from 3.3 ks to 28.6 ks after the BAT trigger. The data are entirely in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Beardmore et al. (GCN Circ. 24001).
The light curve can be modelled with a power-law decay with a decay index of alpha=1.33 (+/-0.05).
A spectrum formed from the PC mode data can be fitted with an absorbed power-law with a photon spectral index of 2.00 (+0.10, -0.09). The best-fitting absorption column is 8.6 (+2.4, -2.2) x 10^20 cm^-2, in excess of the Galactic value of 1.7 x 10^20 cm^-2 (Willingale et al. 2013). The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 3.3 x 10^-11 (4.0 x 10^-11) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
```
Total column:	     8.6 (+2.4, -2.2) x 10^20 cm^-2
Galactic foreground: 1.7 x 10^20 cm^-2
Excess significance: 5.0 sigma
Photon index:	     2.00 (+0.10, -0.09)
```
If the light curve continues to decay with a power-law decay index of 1.33, the count rate at T+24 hours will be 0.032 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 1.1 x 10^-12 (1.3 x 10^-12) erg cm^-2 s^-1.
The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00894718.
This circular is an official product of the Swift-XRT team.
GCN Circular #24006
Y. Sone, A. Yoshida, T. Sakamoto, V. Pal'shin, S. Sugita (AGU), Y. Kawakubo (LSU), A. Tezuka, S. Matsukawa, H. Onozawa, T. Ito, H. Morita (AGU), K. Yamaoka (Nagoya U), S. Nakahira (RIKEN), I. Takahashi (IPMU), Y. Asaoka, S. Ozawa, S. Torii (Waseda U), Y. Shimizu, T. Tamura (Kanagawa U), W. Ishizaki (ICRR), M. L. Cherry (LSU), S. Ricciarini (U of Florence), A. V. Penacchioni, P. S. Marrocchesi (U of Siena), and the CALET collaboration:
The long GRB 190324A (Swift-BAT trigger #894718: LaPorte et al., GCN Circ. 23993; Fermi GBM detection: Hui, GCN Circ. 24002) triggered the CALET Gamma-ray Burst Monitor (CGBM) at 22:44:16.902 UTC on 24 March 2019. The burst signal was seen by all CGBM detectors.
The burst light curve shows a single multi-peaked pulse which starts at T=2.7 sec, peaks at 5.1 sec and ends at T+20.5 sec. The precursor is not seen in the CGBM data. The T90 and T50 durations measured by the SGM data are 12.6 +- 2.3 sec and 4.5 +- 0.5 sec (40-1000 keV), respectively. The ground processed light curve is available at
http://cgbm.calet.jp/cgbm_trigger/ground/1237502436/
The CALET data used in this analysis are provided by the Waseda CALET Operation Center located at the Waseda University.
GCN Circular #24007
A. Y. Lien (GSFC/UMBC), S. D. Barthelmy (GSFC), J. R. Cummings (CPI), H. A. Krimm (NSF/USRA), C. B. Markwardt (GSFC), D. M. Palmer (LANL), T. Sakamoto (AGU), M. Stamatikos (OSU), T. N. Ukwatta (LANL) (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 190324A (trigger #894718) (LaPorte et al., GCN Circ. 23993). The BAT ground-calculated position is RA, Dec = 49.603, -47.212 deg which is
```
   RA(J2000)  =  03h 18m 24.8s
   Dec(J2000) = -47d 12' 42.4"
```
with an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment). The partial coding was 56%.
The mask-weighted light curve shows a precursor from ~T0 to ~T+5 s, and a bright multi-peaked structure that starts at ~T+18 s and ends at ~T+40 s. In addition, there are some weak emission lasting till ~T+80 s. T90 (15-350 keV) is 28.4 +- 11.6 sec (estimated error including systematics).
The time-averaged spectrum from T+0.09 to T+83.30 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.46 +- 0.06. The fluence in the 15-150 keV band is 7.2 +- 0.2 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+23.74 sec in the 15-150 keV band is 11.9 +- 0.5 ph/cm2/sec. All the quoted errors are at the 90% confidence level.
The results of the batgrbproduct analysis are available at http://gcn.gsfc.nasa.gov/notices_s/894718/BA/
GCN Circular #24011
Q. Luo, C. K. Li, X. B. Li, G. Li, J. Y. Liao, S. L. Xiong, C. Z. Liu, X. F. Li, Z. W. Li, Z. Chang, X. F. Lu, A. M. Zhang, Y. F. Zhang, C. L. Zou (IHEP), Y. J. Jin, Z. Zhang (THU), T. P. Li (IHEP/THU), F. J. Lu, L. M. Song, M. Wu, Y. P. Xu, S. N. Zhang (IHEP), report on behalf of the Insight-HXMT team:
At 2019-03-24T22:44:20.500 (T0), the Insight-HXMT/HE detected GRB 190324A(trigger ID: HEB190324947) in a routine search of the data, which was also triggered by Swift/BAT(S. J. LaPorte et al. ,GCN 23993), Fermi/GBM(F. Kunzweiler et al. ,GCN 23994) and CALET/CGBM(Y. Sone et al. ,GCN 24006).
The Insight-HXMT/HE light curve mainly consists of two pulses with a duration (T90) of 6.41 s measured from T0+0.14 s. The 1-ms peak rate, measured from T0+1.283 s, is 1111 cnts/sec. The total counts from this burst is 3551 counts. URL_LC: http://www.hxmt.org/images/GRB/HEB190324947_lc.jpg
All measurements above are made with the CsI detectors operating in the regular mode with the energy range of about 80-800 keV (record energy). Only gamma-rays with energy greater than about 200 keV can penetrate the spacecraft and leave signals in the CsI detectors installed inside of the telescope.
Insight-HXMT is the first Chinese space X-ray telescope, which was fundedjointly by the China National Space Administration (CNSA) and the Chinese Academy of Sciences (CAS). More information about it could be found at: http://www.hxmt.org.

GCN Circular #24014
M. H. Siegel (PSU) and S. J. LaPorte (PSU) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 190324A 3302 s after the BAT trigger (LaPorte et al., GCN Circ. 23993). A fading source consistent with the XRT position (Beardmore et al. GCN Circ. 24001) is detected in the initial UVOT exposures, consistent with the initial report of Marshall (GCN Circ. 23996).
The preliminary UVOT position is:

   RA  (J2000) =  03:18:27.74 =  49.61559 (deg.)
   Dec (J2000) = -47:12:52.6  = -47.21462 (deg.)

with an estimated uncertainty of 0.43 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             3302         3452          147         17.23 +/- 0.04
white            33037        33944          885         19.65 +/- 0.07
white           101768       119129          386        >20.79
v                 3459         3659          197         17.55 +/- 0.11
v                28515        39157          496        >19.48
b                 4281         4481          197         17.98 +/- 0.07
b                10929        11267          329         18.74 +/- 0.08
b                32125        44180         1489         20.65 +/- 0.34
b               101621       118983          386        >20.13
u                 4075         4275          197         16.75 +/- 0.05
u                10016        10923          885         17.78 +/- 0.05
u                22022        22836          792         18.86 +/- 0.08
u               101474       118836          386        >19.68
uvw1              3870         4070          197         16.76 +/- 0.07
uvw1              9110        10010          885         17.65 +/- 0.07
uvw1             20525        21097          563         18.68 +/- 0.16
uvm2              3664         3864          197         16.79 +/- 0.09
uvm2             14888        15397          501         18.37 +/- 0.13
uvw2              4692         4892          197         17.82 +/- 0.12
uvw2             26341        38706         2052         19.76 +/- 0.15

The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.02 in the direction of the burst (Schlegel et al. 1998).

GCN Circular #24015
D. Svinkin, S. Golenetskii, R. Aptekar, D. Frederiks, M. Ulanov, A. Tsvetkova, A. Lysenko, A. Kozlova, and T. Cline on behalf of the Konus-Wind team, report:
The long-duration GRB 190324A (Swift-BAT detection: LaPorte et al., GCN Circ. 23993; Fermi-GBM observation: Hui, GCN Circ. 24002; CALET-GBM detection: Sone et al., GCN Circ. 24006; and Insight-HXMT/HE detection: Luo et al., GCN Circ. 24011) triggered Konus-Wind at T0=81858.644 s UT (22:44:18.644).
The burst light curve shows a multipeaked structure which starts at ~T0-3.7 s and has a total duration of ~17.3 s, followed by a tail of softer emission seen up to ~T0+70 s. The initial weak pulse is marginally seen at ~T0-20 s. The emission is seen up to ~5 MeV.
The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB190324_T81858/
As observed by Konus-Wind, the burst had a fluence of 2.07(-0.28,+0.31)x10^-5 erg/cm2, and a 64-ms peak flux, measured from T0+1.648 s, of 7.59(-1.80,+1.86)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+16.640 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 = -0.90(-0.18,+0.22), the high energy photon index beta = -2.27(-0.23,+0.15), the peak energy Ep = 146(-21,+25) keV (chi2 = 91/97 dof).
The spectrum near the maximum count rate (measured from T0+0.256 to T0+8.448 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 = -0.90(-0.17,+0.21), the high energy photon index beta = -2.26(-0.22,+0.15), the peak energy Ep = 159(-23,+27) keV (chi2 = 77/97 dof).
Assuming the redshift z=1.1715 (Perley et al., GCN Circ. 23999) and a standard cosmology model with H_0 = 67.3 km/s/Mpc, Omega_M = 0.315, and Omega_Lambda = 0.685 (Planck Collaboration, 2014), we estimate the following rest-frame parameters: the isotropic energy release E_iso is ~7.8x10^52 erg, the peak luminosity L_iso is ~6.2x10^52 erg/s, and the rest-frame peak energy of the time-integrated spectrum, Ep,i, is ~317 keV. With these energetics, the burst lies within the 68% prediction bands for both 'Amati' and 'Yonetoku' relations built for the sample of 138 long KW GRBs with known redshifts (Tsvetkova et al., ApJ 850 161, 2017), see http://www.ioffe.ru/LEA/GRBs/GRB190324_T81858/GRB190324A.pdf
All the quoted errors are at the 90% confidence level. All the quoted values are preliminary.

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Jochen Greiner, last update: 26-Mar-2019 [Disclaimer]