Gamma-ray Burst 190320A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

none

Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 20 Mar 19 01:15:36 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     893808,   Seg_Num: 0
GRB_RA:          117.811d {+07h 51m 15s} (J2000),
                 117.959d {+07h 51m 50s} (current),
                 117.424d {+07h 49m 42s} (1950)
GRB_DEC:         -45.890d {-45d 53' 22"} (J2000),
                 -45.940d {-45d 56' 22"} (current),
                 -45.761d {-45d 45' 37"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       16347 [cnts]    Image_Peak=278 [image_cnts]
TRIGGER_DUR:     8.192 [sec] 
TRIGGER_INDEX:   337     E_range: 25-100 keV
BKG_INTEN:       115089 [cnts]
BKG_TIME:        4385.40 SOD {01:13:05.40} UT
BKG_DUR:         64 [sec]
GRB_DATE:        18562 TJD;    79 DOY;   19/03/20
GRB_TIME:        4476.60 SOD {01:14:36.60} UT
GRB_PHI:           3.73 [deg]
GRB_THETA:        49.80 [deg]
SOLN_STATUS:     0x20000003
RATE_SIGNIF:     11.44 [sigma]
IMAGE_SIGNIF:    7.63 [sigma]
MERIT_PARAMS:     +1  +0  +0  +3  +2  -2  +0  +1 +32  +0 
SUN_POSTN:       359.21d {+23h 56m 52s}   -0.34d {-00d 20' 24"}
SUN_DIST:        109.28 [deg]   Sun_angle= -7.9 [hr] (East of Sun)
MOON_POSTN:      167.82d {+11h 11m 16s}   +9.50d {+09d 30' 02"}
MOON_DIST:        71.12 [deg]
MOON_ILLUM:      99 [%]
GAL_COORDS:      259.92, -9.65 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      139.31,-64.64 [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 = 58.21,-20.07 [deg].  
COMMENTS:           
COMMENTS:        NOTE: This BAT event is temporally(20.0<100sec) coincident with the FERMI_GBM event (trignum=574737261).

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Wed 20 Mar 19 01:14:42 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      46
TRIGGER_NUM:     574737261
GRB_RA:           96.767d {+06h 27m 04s} (J2000),
                  96.860d {+06h 27m 27s} (current),
                  96.523d {+06h 26m 05s} (1950)
GRB_DEC:         -55.117d {-55d 07' 00"} (J2000),
                 -55.129d {-55d 07' 45"} (current),
                 -55.084d {-55d 05' 03"} (1950)
GRB_ERROR:       21.43 [deg radius, statistical plus systematic]
GRB_INTEN:       65 [cnts/sec]
DATA_SIGNIF:     6.00 [sigma]
INTEG_TIME:      4.096 [sec]
GRB_DATE:        18562 TJD;    79 DOY;   19/03/20
GRB_TIME:        4456.49 SOD {01:14:16.49} UT
GRB_PHI:         173.00 [deg]
GRB_THETA:        45.00 [deg]
DATA_TIME_SCALE: 4.0960 [sec]
HARD_RATIO:      0.39
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      95%  GRB
2nd_MOST_LIKELY:   3%  Generic Transient
DETECTORS:       0,0,0, 0,0,0, 1,0,0, 1,0,0, 0,0,
SUN_POSTN:       359.21d {+23h 56m 51s}   -0.34d {-00d 20' 25"}
SUN_DIST:         94.08 [deg]   Sun_angle= -6.5 [hr] (East of Sun)
MOON_POSTN:      167.81d {+11h 11m 14s}   +9.50d {+09d 30' 13"}
MOON_DIST:        87.21 [deg]
MOON_ILLUM:      99 [%]
GAL_COORDS:      263.94,-25.35 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      109.09,-78.11 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn190320052/quicklook/glg_lc_medres34_bn190320052.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 187.35,22.83 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Wed 20 Mar 19 01:14:54 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      57
TRIGGER_NUM:     574737261
GRB_RA:          139.770d {+09h 19m 05s} (J2000),
                 139.966d {+09h 19m 52s} (current),
                 139.261d {+09h 17m 03s} (1950)
GRB_DEC:         -36.100d {-36d 06' 00"} (J2000),
                 -36.182d {-36d 10' 53"} (current),
                 -35.888d {-35d 53' 17"} (1950)
GRB_ERROR:       11.34 [deg radius, statistical only]
DATA_SIGNIF:     6.20 [sigma]
DATA_INTERVAL:   4.096 [sec]
GRB_DATE:        18562 TJD;    79 DOY;   19/03/20
GRB_TIME:        4456.49 SOD {01:14:16.49} UT
GRB_PHI:         181.00 [deg]
GRB_THETA:        79.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   4153 (Gnd S/W Version number)
SUN_POSTN:       359.21d {+23h 56m 51s}   -0.34d {-00d 20' 25"}
SUN_DIST:        128.43 [deg]   Sun_angle= -9.4 [hr] (East of Sun)
MOON_POSTN:      167.81d {+11h 11m 14s}   +9.50d {+09d 30' 11"}
MOON_DIST:        52.67 [deg]
MOON_ILLUM:      99 [%]
GAL_COORDS:      262.03,  9.39 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      158.39,-48.43 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn190320052/quicklook/glg_lc_medres34_bn190320052.gif
POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_574737261.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.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Wed 20 Mar 19 01:15:45 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      0
TRIGGER_NUM:     574737261
GRB_RA:          116.970d {+07h 47m 53s} (J2000),
                 117.115d {+07h 48m 27s} (current),
                 116.594d {+07h 46m 23s} (1950)
GRB_DEC:         -46.820d {-46d 49' 11"} (J2000),
                 -46.869d {-46d 52' 06"} (current),
                 -46.695d {-46d 41' 39"} (1950)
GRB_ERROR:       5.99 [deg radius, statistical only]
DATA_SIGNIF:     10.80 [sigma]
DATA_INTERVAL:   12.288 [sec]
GRB_DATE:        18562 TJD;    79 DOY;   19/03/20
GRB_TIME:        4456.49 SOD {01:14:16.49} UT
GRB_PHI:         180.00 [deg]
GRB_THETA:        59.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   41531 (Gnd S/W Version number)
SUN_POSTN:       359.21d {+23h 56m 52s}   -0.34d {-00d 20' 24"}
SUN_DIST:        108.40 [deg]   Sun_angle= -7.9 [hr] (East of Sun)
MOON_POSTN:      167.82d {+11h 11m 16s}   +9.50d {+09d 29' 60"}
MOON_DIST:        72.14 [deg]
MOON_ILLUM:      99 [%]
GAL_COORDS:      260.46,-10.60 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      139.03,-65.73 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn190320052/quicklook/glg_lc_medres34_bn190320052.gif
POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_574737261.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(20.0<100sec) coincident with the SWIFT_BAT event (trignum=893808).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Wed 20 Mar 19 01:23:19 UT
NOTICE_TYPE:     Fermi-GBM Final Position
RECORD_NUM:      0
TRIGGER_NUM:     574737261
GRB_RA:          129.170d {+08h 36m 41s} (J2000),
                 129.326d {+08h 37m 18s} (current),
                 128.763d {+08h 35m 03s} (1950)
GRB_DEC:         -47.260d {-47d 15' 35"} (J2000),
                 -47.328d {-47d 19' 39"} (current),
                 -47.085d {-47d 05' 05"} (1950)
GRB_ERROR:       4.98 [deg radius, statistical only]
GRB_DATE:        18562 TJD;    79 DOY;   19/03/20
GRB_TIME:        4456.49 SOD {01:14:16.49} UT
GRB_PHI:         175.00 [deg]
GRB_THETA:        66.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   41531 (Gnd S/W Version number)
SUN_POSTN:       359.22d {+23h 56m 53s}   -0.34d {-00d 20' 17"}
SUN_DIST:        115.61 [deg]   Sun_angle= -8.7 [hr] (East of Sun)
MOON_POSTN:      167.89d {+11h 11m 34s}   +9.47d {+09d 28' 23"}
MOON_DIST:        66.31 [deg]
MOON_ILLUM:      99 [%]
GAL_COORDS:      265.36, -3.85 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      156.03,-62.02 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn190320052/quicklook/glg_lc_medres34_bn190320052.gif
LOC_URL:         http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn190320052/quicklook/glg_locplot_all_bn190320052.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(20.0<100sec) coincident with the SWIFT_BAT event (trignum=893808).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 20 Mar 19 01:20:34 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     8388607,   Seg_Num: 0
GRB_RA:          117.811d {+07h 51m 15s} (J2000),
                 117.959d {+07h 51m 50s} (current),
                 117.424d {+07h 49m 42s} (1950)
GRB_DEC:         -45.890d {-45d 53' 22"} (J2000),
                 -45.940d {-45d 56' 22"} (current),
                 -45.761d {-45d 45' 37"} (1950)
GRB_DATE:        18562 TJD;    79 DOY;   19/03/20
GRB_TIME:        4476.60 SOD {01:14:36.60} UT
TRIGGER_INDEX:   337
GRB_PHI:           3.73 [deg]
GRB_THETA:        49.80 [deg]
DELTA_TIME:      0.00 [sec]
TRIGGER_DUR:     8.192 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     0.00 [sigma]
IMAGE_SIGNIF:    0.00 [sigma]
LC_URL:          sw00893808000msb.lc
SUN_POSTN:       359.22d {+23h 56m 52s}   -0.34d {-00d 20' 19"}
SUN_DIST:        109.28 [deg]   Sun_angle= -7.9 [hr] (East of Sun)
MOON_POSTN:      167.87d {+11h 11m 28s}   +9.48d {+09d 28' 58"}
MOON_DIST:        71.13 [deg]
MOON_ILLUM:      99 [%]
GAL_COORDS:      259.92, -9.65 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      139.31,-64.64 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT-BAT GRB Lightcurve.  
COMMENTS:           
COMMENTS:        WARNING: No BAT_Position TDRSS message was received for this trigger_number!  
COMMENTS:           
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 = 58.21,-20.07 [deg].  
COMMENTS:        The 3rd packet (of 3) was missing in the lightcurve data stream.

GCN Circular #23973
J.D. Gropp (PSU), H. A. Krimm (NSF/USRA), A. Y. Lien (GSFC/UMBC), M. J. Moss (George Washington University), T. Sakamoto (AGU), B. Sbarufatti (PSU) and A. Tohuvavohu (PSU) report on behalf of the Neil Gehrels Swift Observatory Team:
At 01:14:36 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 190320A (trigger=893808). Swift did not slew immediately due to an observing constraint. The BAT on-board calculated location is RA, Dec 117.811, -45.890 which is
```
 RA(J2000) = 07h 51m 15s
 Dec(J2000) = -45d 53' 22"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). There is a data gap from ~T+10 s to ~T+100 s, and the available data show no significant structure. However, since the image significance is 7.63 sigma, and the trigger is temporally (within ~ 20 sec) coincident with the Fermi/GBM event (trignum=574737261), we believe this is likely to be a real GRB.
Due to an observing constraint, Swift will not slew until T0+44.3 minutes. There will be no XRT or UVOT data until this time.
Burst Advocate for this burst is J.D. Gropp (jdg44 AT psu.edu). 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:     Wed 20 Mar 19 02:01:57 UT
NOTICE_TYPE:     Swift-XRT Nack-Position
TRIGGER_NUM:     893808,   Seg_Num: 0
POINT_RA:        117.829d {+07h 51m 19s} (J2000)
POINT_DEC:       -45.881d {-45d 52' 50"} (J2000)
IMG_START_DATE:  18562 TJD;    79 DOY;   19/03/20
IMG_START_TIME:  7308.51 SOD {02:01:48.51} UT,   2831.9 [sec] since BAT Trigger Time
COUNTS:          2    Min_needed= 20
STD_DEV:         0.00   Max_StdDev_for_Good=28.44 [arcsec]
PH2_ITER:        1    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:     Wed 20 Mar 19 02:05:28 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     893808,   Seg_Num: 0
POINT_RA:        117.829d {+07h 51m 19s} (J2000)
POINT_DEC:       -45.880d {-45d 52' 49"} (J2000)
POINT_ROLL:      248.409d
IMG_START_DATE:  18562 TJD;    79 DOY;   19/03/20
IMG_START_TIME:  7310.81 SOD {02:01:50.81} UT,   2834.2 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        4.657
N_STARS:         190
X_OFFSET:        540 [pixels]
Y_OFFSET:        468 [pixels]
X_MAX:           1499 [pixels]
Y_MAX:           1427 [pixels]
DET_THRESH:      18
PHOTO_THRESH:    10
SL_URL:          sw00893808000msufc2834.fits
SUN_POSTN:       359.25d {+23h 56m 59s}   -0.33d {-00d 19' 35"}
SUN_DIST:        109.28 [deg]   Sun_angle= -7.9 [hr] (East of Sun)
MOON_POSTN:      168.31d {+11h 13m 15s}   +9.32d {+09d 19' 23"}
MOON_DIST:        71.23 [deg]
MOON_ILLUM:      99 [%]
GAL_COORDS:      259.92, -9.63 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      139.33,-64.63 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 20 Mar 19 02:05:48 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     893808,   Seg_Num: 0
POINT_RA:        117.829d {+07h 51m 19s} (J2000)
POINT_DEC:       -45.880d {-45d 52' 49"} (J2000)
POINT_ROLL:      248.409d
IMG_START_DATE:  18562 TJD;    79 DOY;   19/03/20
IMG_START_TIME:  7310.81 SOD {02:01:50.81} UT,   2834.2 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        4.657
N_STARS:         190
X_OFFSET:        540 [pixels]
Y_OFFSET:        468 [pixels]
X_MAX:           1499 [pixels]
Y_MAX:           1427 [pixels]
DET_THRESH:      18
PHOTO_THRESH:    10
SL_URL:          sw00893808000msufc2834.fits
SUN_POSTN:       359.25d {+23h 56m 59s}   -0.33d {-00d 19' 35"}
SUN_DIST:        109.28 [deg]   Sun_angle= -7.9 [hr] (East of Sun)
MOON_POSTN:      168.32d {+11h 13m 16s}   +9.32d {+09d 19' 18"}
MOON_DIST:        71.24 [deg]
MOON_ILLUM:      99 [%]
GAL_COORDS:      259.92, -9.63 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      139.33,-64.63 [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:     Wed 20 Mar 19 02:05:50 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     893808,   Seg_Num: 0
GRB_RA:          117.8481d {+07h 51m 23.54s} (J2000),
                 117.9967d {+07h 51m 59.20s} (current),
                 117.4614d {+07h 49m 50.72s} (1950)
GRB_DEC:         -45.8878d {-45d 53' 16.0"} (J2000),
                 -45.9379d {-45d 56' 16.4"} (current),
                 -45.7586d {-45d 45' 30.8"} (1950)
GRB_ERROR:       4.0 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  18562 TJD;    79 DOY;   19/03/20
IMG_START_TIME:  7321.00 SOD {02:02:01.00} UT,   2844.4 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       359.25d {+23h 56m 59s}   -0.33d {-00d 19' 35"}
SUN_DIST:        109.29 [deg]   Sun_angle= -7.9 [hr] (East of Sun)
MOON_POSTN:      168.32d {+11h 13m 16s}   +9.32d {+09d 19' 18"}
MOON_DIST:        71.23 [deg]
MOON_ILLUM:      99 [%]
GAL_COORDS:      259.93, -9.62 [deg] galactic lon,lat of the burst
ECL_COORDS:      139.36,-64.63 [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:     Wed 20 Mar 19 02:08:09 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     893808,   Seg_Num: 0
POINT_RA:        117.829d {+07h 51m 19s} (J2000)
POINT_DEC:       -45.880d {-45d 52' 49"} (J2000)
ROLL:            248.409d
IMG_START_DATE:  18562 TJD;    79 DOY;   19/03/20
IMG_START_TIME:  7310.81 SOD {02:01:50.81} UT,   2834.2 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     574740133
X_OFFSET:        859 [pixels]
Y_OFFSET:        787 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1019
Y_GRB_POS:       947
BINNING_INDEX:   1
IM_URL:          sw00893808000msuni2857.fits
SUN_POSTN:       359.25d {+23h 56m 59s}   -0.33d {-00d 19' 32"}
SUN_DIST:        109.28 [deg]   Sun_angle= -7.9 [hr] (East of Sun)
MOON_POSTN:      168.34d {+11h 13m 21s}   +9.31d {+09d 18' 48"}
MOON_DIST:        71.24 [deg]
MOON_ILLUM:      99 [%]
GAL_COORDS:      259.92, -9.63 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      139.33,-64.63 [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:     Wed 20 Mar 19 02:08:22 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     893808,   Seg_Num: 0
POINT_RA:        117.829d {+07h 51m 19s} (J2000)
POINT_DEC:       -45.880d {-45d 52' 49"} (J2000)
ROLL:            248.409d
IMG_START_DATE:  18562 TJD;    79 DOY;   19/03/20
IMG_START_TIME:  7310.81 SOD {02:01:50.81} UT,   2834.2 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     574740133
X_OFFSET:        859 [pixels]
Y_OFFSET:        787 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1019
Y_GRB_POS:       947
BINNING_INDEX:   1
IM_URL:          sw00893808000msuni2857.fits
SUN_POSTN:       359.25d {+23h 57m 00s}   -0.33d {-00d 19' 32"}
SUN_DIST:        109.28 [deg]   Sun_angle= -7.9 [hr] (East of Sun)
MOON_POSTN:      168.34d {+11h 13m 22s}   +9.31d {+09d 18' 45"}
MOON_DIST:        71.24 [deg]
MOON_ILLUM:      99 [%]
GAL_COORDS:      259.92, -9.63 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      139.33,-64.63 [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:     Wed 20 Mar 19 02:38:17 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     893808,   Seg_Num: 0
GRB_RA:          117.8492d {+07h 51m 23.80s} (J2000),
                 117.9978d {+07h 51m 59.47s} (current),
                 117.4625d {+07h 49m 50.99s} (1950)
GRB_DEC:         -45.8880d {-45d 53' 16.7"} (J2000),
                 -45.9381d {-45d 56' 17.1"} (current),
                 -45.7588d {-45d 45' 31.5"} (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:  18562 TJD;    79 DOY;   19/03/20
IMG_START_TIME:  7321.00 SOD {02:02:01.00} UT,   2844.4 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       359.27d {+23h 57m 04s}   -0.32d {-00d 19' 03"}
SUN_DIST:        109.29 [deg]   Sun_angle= -7.9 [hr] (East of Sun)
MOON_POSTN:      168.64d {+11h 14m 33s}   +9.21d {+09d 12' 21"}
MOON_DIST:        71.31 [deg]
MOON_ILLUM:      99 [%]
GAL_COORDS:      259.93, -9.62 [deg] galactic lon,lat of the burst
ECL_COORDS:      139.36,-64.63 [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 #23974
J.A. Kennea (PSU), G. Cusumano (INAF-IASF PA), M. Perri (ASDC), P.A. Evans (U. Leicester), J.P. Osborne (U. Leicester) and D.N. Burrows (PSU) report on behalf of the Swift-XRT team:
The XRT began observing the field of GRB 190320A at 02:01:48.5 UT, 2831.9 seconds after the BAT trigger. Using promptly downlinked data we find an uncatalogued X-ray source located at RA, Dec 117.84887, -45.88801 which is equivalent to:
```
   RA(J2000)  = 07h 51m 23.73s
   Dec(J2000) = -45d 53' 16.8"
```
with an uncertainty of 3.7 arcseconds (radius, 90% containment). This location is 95 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. We cannot determine whether the source is fading at the present time.
A power-law fit to a spectrum formed from promptly downlinked event data does not constrain the column density.

GCN Circular #23975
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 GRB190320.05 ( 7h 51m 14.64s , -45d 53m 24.00s, R=0.05) 82 sec after trigger time at 2019-03-20 01:15:58 UT, with upper limit up to 18.7 mag. The observations began at zenit distance = 17 deg. The sun altitude is -31.8 deg.
The galactic latitude b = -60 deg., longitude l = 98 deg.
We obtain a following upper limits.

Tmid-T0  |          Site       |Filt.| Expt. | Limit| Comment
_________|_____________________|_____|_______|______|________

       92 |         MASTER-OAFA |   C |    20 | 16.7 |
      127 |         MASTER-OAFA |   C |    90 | 17.5 |  Coadd
      392 |         MASTER-OAFA |   C |   620 | 18.2 |  Coadd
      156 |         MASTER-OAFA |   C |    30 | 16.9 |
      229 |         MASTER-OAFA |   C |    40 | 17.1 |
      319 |         MASTER-OAFA |   C |    60 | 17.1 |
      409 |         MASTER-OAFA |   C |   240 | 17.8 |  Coadd
      429 |         MASTER-OAFA |   C |    80 | 17.3 |
      559 |         MASTER-OAFA |   C |   100 | 17.4 |
      714 |         MASTER-OAFA |   C |   130 | 17.5 |
      884 |         MASTER-OAFA |   C |   470 | 18.1 |  Coadd
      901 |         MASTER-OAFA |   C |   160 | 17.6 |
     1111 |         MASTER-OAFA |   C |   180 | 17.7 |
     1921 |         MASTER-OAFA |   C |  1800 | 18.6 |  Coadd
     1331 |         MASTER-OAFA |   C |   180 | 17.7 |
     1511 |         MASTER-OAFA |   C |   540 | 18.2 |  Coadd  
     1552 |         MASTER-OAFA |   C |   180 | 17.7 | 
     1772 |         MASTER-OAFA |   C |   180 | 17.7 |
     1992 |         MASTER-OAFA |   C |   180 | 17.7 |
     2172 |         MASTER-OAFA |   C |   540 | 18.1 |  Coadd
     2212 |         MASTER-OAFA |   C |   180 | 17.6 |
     2433 |         MASTER-OAFA |   C |   180 | 17.6 |
     2652 |         MASTER-OAFA |   C |   180 | 17.6 |
     2832 |         MASTER-OAFA |   C |   540 | 17.6 |  Coadd
     2871 |         MASTER-OAFA |   C |   180 | 17.6 |
     3090 |         MASTER-OAFA |   C |   180 | 17.7 |
     3311 |         MASTER-OAFA |   C |   180 | 17.7 |
     3491 |         MASTER-OAFA |   C |   540 | 18.2 |  Coadd
     4121 |         MASTER-OAFA |   C |  1800 | 18.7 |  Coadd

Filter C is a clear (unfiltred) band.
The observation and reduction will continue.

GCN Circular #23976
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. 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),
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)
MASTER-OAFA automatically pointed to Swift GRB 190320A (Kennea et al. GCN 23974, Gropp et al. GCN 23973, Lipunov et al. GCN 23975) detected MASTER OT J075123.56-455316.54 at position
RA,Dec(2000)=07h 51m 23.56s , -45d 53m 16.54s
Preliminary photometry is
```
2019-03-20 01:15:58.049 17.2
2019-03-20 01:19:25.483 17.4
```
GCN Circular #23977
J.P. Osborne, A.P. Beardmore, P.A. Evans and M.R. Goad (U. Leicester) report on behalf of the Swift-XRT team.
Using 303 s of XRT Photon Counting mode data and 1 UVOT images for GRB 190320A, 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 = 117.84813, -45.88785 which is equivalent to:
```
RA (J2000): 07h 51m 23.55s
Dec (J2000): -45d 53' 16.3"
```
with an uncertainty of 4.5 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 Circular #23978
A. von Kienlin (MPE), S. Poolakkil (UAH) and C. Meegan (UAH) report on behalf of the Fermi GBM Team:
"At 01:14:16.49 UT on 20 March 2019, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 1903020A (trigger 574737261 / 190320052), which was also detected by the Swift/BAT (Gropp et al. 2008, GCN 23973). The GBM on-ground location is consistent with the Swift position.
The angle from the Fermi LAT boresight at the GBM trigger time is 59.7 degrees.
The GBM light curve shows a structured pulse with a duration (T90) of about 43 s (50-300 keV). The time-averaged spectrum from T0-4.096 s to T0+32.769 s is best fit by a power law function with an exponential high-energy cutoff. The power law index is -0.75 +/- 0.07 and the cutoff energy, parameterized as Epeak, is 314 +/- 35 keV
The event fluence (10-1000 keV) in this time interval is (6.7 +/- 0.4)E-06 erg/cm^2. The 1.024-sec peak photon flux measured starting from T0+29.44 s in the 10-1000 keV band is 1.93 +/- 0.17 ph/s/cm^2.
A Band function fits the spectrum equally well with Epeak= 296 +/- 51 keV, alpha = -0.74 +/- 0.09 and beta = -2.2 +/- 0.4.
The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog."
GCN Circular #23979
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 Stationof 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 Swift GRB190320A (Kennea et al. GCN 23974, Gropp et al. GCN 23973, Lipunov et al. GCN 23975) 21 sec after notice time (82 sec after trigger time) at 2019-03-20 01:15:58 UT (Lipunov et al. GCN 23975)
MASTER-OAFA find a new object MASTER OT J075123.56-455316.54 (Lipunov et al. GCN 23976) within Swift GRB 190320A error box (Kennea et al. GCN 23976, Osborne et al. GCN23977) at position RA,Dec(2000)=07h 51m 23.56s , -45d 53m 16.54s (+-0.7")
MASTER OT J075123.56-455316.54 decay by 1 magnitude during several minutes.
The reduction is continued.
GCN Circular #23980
H. A. Krimm (NSF/USRA), S. D. Barthelmy (GSFC), J. R. Cummings (CPI), J.D. Gropp (PSU), A. Y. Lien (GSFC/UMBC), 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 190320A (trigger #893808) (Gropp, et al., GCN Circ.23973). The BAT ground-calculated position is RA, Dec = 117.824, -45.876 deg which is
```
  RA(J2000)  =  07h 51m 17.8s 
  Dec(J2000) = -45d 52' 33.3" 
```
with an uncertainty of 1.9 arcmin, (radius, sys+stat, 90% containment). The partial coding was 29%.
The mask-weighted light curve shows a single episode with some superimposed structure from roughly T-25 to T+40 sec. The spacecraft slewed away from the burst position at around T+500 sec. T90 (15-350 keV) is 64.0 +- 12.1 sec (estimated error including systematics).
The time-averaged spectrum from T-27.20 to T+44.80 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.20 +- 0.20. The fluence in the 15-150 keV band is 2.7 +- 0.3 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T-0.20 sec in the 15-150 keV band is 1.3 +- 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/893808/BA/
GCN Circular #23981
K.L. Page (U. Leicester), V. D'Elia (ASDC), A. D'Ai (INAF-IASFPA), A. Melandri (INAF-OAB), D.N. Burrows (PSU), A. Tohuvavohu (PSU), S. J. LaPorte (PSU), A.P. Beardmore (U. Leicester), P.A. Evans (U. Leicester) and J.D. Gropp report on behalf of the Swift-XRT team:
We have analysed 6.8 ks of XRT data for GRB 190320A (Gropp et al. GCN Circ. 23973), from 2.8 ks to 22.2 ks after the BAT trigger. The data are entirely in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Osborne et al. (GCN Circ. 23977).
The light curve can be modelled with a power-law decay with a decay index of alpha=1.26 (+0.17, -0.16).
A spectrum formed from the PC mode data can be fitted with an absorbed power-law with a photon spectral index of 2.06 (+0.33, -0.21). The best-fitting absorption column is 3.33 (+1.48, -0.19) x 10^21 cm^-2, consistent with the Galactic value of 3.1 x 10^21 cm^-2 (Willingale et al. 2013). The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 3.6 x 10^-11 (5.7 x 10^-11) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
```
Total column:	     3.33 (+1.48, -0.19) x 10^21 cm^-2
Galactic foreground: 3.1 x 10^21 cm^-2
Excess significance: <1.6 sigma
Photon index:	     2.06 (+0.33, -0.21)
```
If the light curve continues to decay with a power-law decay index of 1.26, the count rate at T+24 hours will be 2.1 x 10^-3 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 7.5 x 10^-14 (1.2 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/00893808.
This circular is an official product of the Swift-XRT team.
GCN Circular #23982
F. E. Marshall (NASA/GSFC) and J. D. Gropp (PSU) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 190320A 2834 s after the BAT trigger (Gropp et al., GCN Circ. 23973). No optical afterglow consistent with the XRT position (Lipunov et al. GCN Circ. 23976) is detected in the initial UVOT exposures. Preliminary 3-sigma upper limits using the UVOT photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the first finding chart (FC) exposure and subsequent exposures are:
```
Filter         T_start(s)   T_stop(s)      Exp(s)         Mag

white_FC          2834         2984          147         >20.0
white             2834        16112         1213         >21.4
v                 2992        21862         1645         >20.4
b                 3812        15216         1082         >20.8
u                 3607         3807          197         >19.6
w1                3402         3602          197         >19.5
m2                3196        22200          524         >19.8
w2                4223        20949         1776         >20.1
```
The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.23 in the direction of the burst (Schlegel et al. 1998).

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Jochen Greiner, last update: 20-Mar-2019 [Disclaimer]