Gamma-ray Burst 190422A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

none

Results of Observations

GCN/BACODINE POSITION NOTICE

 
TITLE:           GCN/SWIFT NOTICE 
NOTICE_DATE:     Mon 22 Apr 19 22:57:26 UT 
NOTICE_TYPE:     Swift-BAT GRB Position 
TRIGGER_NUM:     899979,   Seg_Num: 0 
GRB_RA:          182.124d {+12h 08m 30s} (J2000), 
                 182.379d {+12h 09m 31s} (current), 
                 181.469d {+12h 05m 52s} (1950) 
GRB_DEC:         -60.238d {-60d 14' 15"} (J2000), 
                 -60.345d {-60d 20' 42"} (current), 
                 -59.960d {-59d 57' 34"} (1950) 
GRB_ERROR:       3.00 [arcmin radius, statistical only] 
GRB_INTEN:       0 [cnts]    Image_Peak=3245 [image_cnts] 
TRIGGER_DUR:     104.000 [sec]  
TRIGGER_INDEX:   20000     E_range: 15-50 keV 
BKG_INTEN:       0 [cnts] 
BKG_TIME:        0.00 SOD {00:00:00.00} UT 
BKG_DUR:         0 [sec] 
GRB_DATE:        18595 TJD;   112 DOY;   19/04/22 
GRB_TIME:        82529.21 SOD {22:55:29.21} UT 
GRB_PHI:         133.03 [deg] 
GRB_THETA:        15.85 [deg] 
SOLN_STATUS:     0x13 
RATE_SIGNIF:     0.00 [sigma]
IMAGE_SIGNIF:    10.54 [sigma] 
MERIT_PARAMS:     +1  +0  +0  +7  +1  +0  +0  +1 +61  +0  
SUN_POSTN:        30.33d {+02h 01m 19s}  +12.35d {+12d 20' 52"} 
SUN_DIST:        127.79 [deg]   Sun_angle= -10.1 [hr] (East of Sun) 
MOON_POSTN:      256.47d {+17h 05m 52s}  -20.07d {-20d 04' 26"} 
MOON_DIST:        64.81 [deg] 
MOON_ILLUM:      86 [%] 
GAL_COORDS:      297.62,  2.19 [deg] galactic lon,lat of the burst (or transient) 
ECL_COORDS:      216.13,-52.11 [deg] ecliptic lon,lat of the burst (or transient) 
COMMENTS:        SWIFT-BAT GRB Coordinates.   
COMMENTS:        This is an image trigger.  (The RATE_SIGNIF & BKG_{INTEN, TIME, DUR} are undefined.)   
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 = 260.64,0.33 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Mon 22 Apr 19 22:58:50 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      46
TRIGGER_NUM:     577666709
GRB_RA:          192.167d {+12h 48m 40s} (J2000),
                 192.479d {+12h 49m 55s} (current),
                 191.368d {+12h 45m 28s} (1950)
GRB_DEC:         -70.450d {-70d 27' 00"} (J2000),
                 -70.555d {-70d 33' 17"} (current),
                 -70.177d {-70d 10' 38"} (1950)
GRB_ERROR:       16.58 [deg radius, statistical plus systematic]
GRB_INTEN:       125 [cnts/sec]
DATA_SIGNIF:     8.50 [sigma]
INTEG_TIME:      2.048 [sec]
GRB_DATE:        18595 TJD;   112 DOY;   19/04/22
GRB_TIME:        82704.00 SOD {22:58:24.00} UT
GRB_PHI:         231.98 [deg]
GRB_THETA:        60.00 [deg]
DATA_TIME_SCALE: 2.0480 [sec]
HARD_RATIO:      1.41
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      78%  GRB
2nd_MOST_LIKELY:  19%  Distant Particles
DETECTORS:       0,0,0, 0,0,0, 1,0,1, 0,0,0, 0,0,
SUN_POSTN:        30.33d {+02h 01m 20s}  +12.35d {+12d 20' 53"}
SUN_DIST:        120.74 [deg]   Sun_angle= -10.8 [hr] (East of Sun)
MOON_POSTN:      256.48d {+17h 05m 55s}  -20.08d {-20d 04' 34"}
MOON_DIST:        62.56 [deg]
MOON_ILLUM:      86 [%]
GAL_COORDS:      302.70, -7.58 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      233.34,-56.78 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn190422957/quicklook/glg_lc_medres34_bn190422957.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 127.32,-20.85 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Mon 22 Apr 19 22:59:03 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      57
TRIGGER_NUM:     577666709
GRB_RA:          190.070d {+12h 40m 17s} (J2000),
                 190.349d {+12h 41m 24s} (current),
                 189.352d {+12h 37m 24s} (1950)
GRB_DEC:         -58.930d {-58d 55' 47"} (J2000),
                 -59.036d {-59d 02' 08"} (current),
                 -58.656d {-58d 39' 19"} (1950)
GRB_ERROR:       6.33 [deg radius, statistical only]
DATA_SIGNIF:     12.60 [sigma]
DATA_INTERVAL:   4.096 [sec]
GRB_DATE:        18595 TJD;   112 DOY;   19/04/22
GRB_TIME:        82704.00 SOD {22:58:24.00} UT
GRB_PHI:         224.00 [deg]
GRB_THETA:        69.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   4153 (Gnd S/W Version number)
SUN_POSTN:        30.33d {+02h 01m 20s}  +12.35d {+12d 20' 54"}
SUN_DIST:        130.97 [deg]   Sun_angle= -10.7 [hr] (East of Sun)
MOON_POSTN:      256.48d {+17h 05m 56s}  -20.08d {-20d 04' 35"}
MOON_DIST:        60.67 [deg]
MOON_ILLUM:      86 [%]
GAL_COORDS:      301.49,  3.91 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      219.81,-48.59 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn190422957/quicklook/glg_lc_medres34_bn190422957.gif
POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_577666709.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:     Mon 22 Apr 19 23:07:37 UT
NOTICE_TYPE:     Fermi-GBM Final Position
RECORD_NUM:      0
TRIGGER_NUM:     577666709
GRB_RA:          188.680d {+12h 34m 43s} (J2000),
                 188.957d {+12h 35m 50s} (current),
                 187.967d {+12h 31m 52s} (1950)
GRB_DEC:         -60.920d {-60d 55' 11"} (J2000),
                 -61.026d {-61d 01' 33"} (current),
                 -60.645d {-60d 38' 39"} (1950)
GRB_ERROR:       4.87 [deg radius, statistical only]
GRB_DATE:        18595 TJD;   112 DOY;   19/04/22
GRB_TIME:        82704.00 SOD {22:58:24.00} UT
GRB_PHI:         226.00 [deg]
GRB_THETA:        68.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   41531 (Gnd S/W Version number)
SUN_POSTN:        30.34d {+02h 01m 21s}  +12.35d {+12d 21' 01"}
SUN_DIST:        128.88 [deg]   Sun_angle= -10.6 [hr] (East of Sun)
MOON_POSTN:      256.56d {+17h 06m 15s}  -20.09d {-20d 05' 21"}
MOON_DIST:        61.72 [deg]
MOON_ILLUM:      86 [%]
GAL_COORDS:      300.90,  1.89 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      220.81,-50.59 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn190422957/quicklook/glg_lc_medres34_bn190422957.gif
LOC_URL:         http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn190422957/quicklook/glg_locplot_all_bn190422957.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.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 22 Apr 19 23:00:01 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     899979,   Seg_Num: 0
GRB_RA:          182.124d {+12h 08m 30s} (J2000),
                 182.379d {+12h 09m 31s} (current),
                 181.469d {+12h 05m 52s} (1950)
GRB_DEC:         -60.238d {-60d 14' 15"} (J2000),
                 -60.345d {-60d 20' 42"} (current),
                 -59.960d {-59d 57' 34"} (1950)
GRB_DATE:        18595 TJD;   112 DOY;   19/04/22
GRB_TIME:        82529.21 SOD {22:55:29.21} UT
TRIGGER_INDEX:   20000
GRB_PHI:         133.03 [deg]
GRB_THETA:        15.85 [deg]
DELTA_TIME:      0.00 [sec]
TRIGGER_DUR:     104.000 [sec] 
SOLN_STATUS:     0x13
RATE_SIGNIF:     0.00 [sigma]
IMAGE_SIGNIF:    10.54 [sigma]
LC_URL:          sw00899979000msb.lc
SUN_POSTN:        30.33d {+02h 01m 20s}  +12.35d {+12d 20' 54"}
SUN_DIST:        127.79 [deg]   Sun_angle= -10.1 [hr] (East of Sun)
MOON_POSTN:      256.49d {+17h 05m 58s}  -20.08d {-20d 04' 40"}
MOON_DIST:        64.81 [deg]
MOON_ILLUM:      86 [%]
GAL_COORDS:      297.62,  2.19 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      216.13,-52.11 [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 an image 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 = 260.64,0.33 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 22 Apr 19 23:06:03 UT
NOTICE_TYPE:     Swift-XRT Nack-Position
TRIGGER_NUM:     899979,   Seg_Num: 0
POINT_RA:        182.094d {+12h 08m 23s} (J2000)
POINT_DEC:       -60.244d {-60d 14' 36"} (J2000)
IMG_START_DATE:  18595 TJD;   112 DOY;   19/04/22
IMG_START_TIME:  83058.52 SOD {23:04:18.52} UT,   529.3 [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:     Mon 22 Apr 19 23:08:49 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     899979,   Seg_Num: 0
POINT_RA:        182.094d {+12h 08m 23s} (J2000)
POINT_DEC:       -60.243d {-60d 14' 35"} (J2000)
POINT_ROLL:      215.798d
IMG_START_DATE:  18595 TJD;   112 DOY;   19/04/22
IMG_START_TIME:  83061.18 SOD {23:04:21.18} UT,   532.0 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        3.563
N_STARS:         190
X_OFFSET:        342 [pixels]
Y_OFFSET:        540 [pixels]
X_MAX:           1301 [pixels]
Y_MAX:           1499 [pixels]
DET_THRESH:      16
PHOTO_THRESH:    9
SL_URL:          sw00899979000msufc0531.fits
SUN_POSTN:        30.34d {+02h 01m 21s}  +12.35d {+12d 21' 02"}
SUN_DIST:        127.78 [deg]   Sun_angle= -10.1 [hr] (East of Sun)
MOON_POSTN:      256.57d {+17h 06m 18s}  -20.09d {-20d 05' 27"}
MOON_DIST:        64.86 [deg]
MOON_ILLUM:      86 [%]
GAL_COORDS:      297.61,  2.18 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      216.12,-52.12 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 22 Apr 19 23:09:09 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     899979,   Seg_Num: 0
POINT_RA:        182.094d {+12h 08m 23s} (J2000)
POINT_DEC:       -60.243d {-60d 14' 35"} (J2000)
POINT_ROLL:      215.798d
IMG_START_DATE:  18595 TJD;   112 DOY;   19/04/22
IMG_START_TIME:  83061.18 SOD {23:04:21.18} UT,   532.0 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        3.563
N_STARS:         190
X_OFFSET:        342 [pixels]
Y_OFFSET:        540 [pixels]
X_MAX:           1301 [pixels]
Y_MAX:           1499 [pixels]
DET_THRESH:      16
PHOTO_THRESH:    9
SL_URL:          sw00899979000msufc0531.fits
SUN_POSTN:        30.34d {+02h 01m 21s}  +12.35d {+12d 21' 02"}
SUN_DIST:        127.78 [deg]   Sun_angle= -10.1 [hr] (East of Sun)
MOON_POSTN:      256.58d {+17h 06m 19s}  -20.09d {-20d 05' 29"}
MOON_DIST:        64.86 [deg]
MOON_ILLUM:      86 [%]
GAL_COORDS:      297.61,  2.18 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      216.12,-52.12 [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:     Mon 22 Apr 19 23:10:21 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     899979,   Seg_Num: 0
POINT_RA:        182.094d {+12h 08m 23s} (J2000)
POINT_DEC:       -60.243d {-60d 14' 35"} (J2000)
ROLL:            215.798d
IMG_START_DATE:  18595 TJD;   112 DOY;   19/04/22
IMG_START_TIME:  83061.18 SOD {23:04:21.18} UT,   532.0 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     577667083
X_OFFSET:        661 [pixels]
Y_OFFSET:        859 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       821
Y_GRB_POS:       1019
BINNING_INDEX:   1
IM_URL:          sw00899979000msuni0554.fits
SUN_POSTN:        30.34d {+02h 01m 21s}  +12.35d {+12d 21' 03"}
SUN_DIST:        127.78 [deg]   Sun_angle= -10.1 [hr] (East of Sun)
MOON_POSTN:      256.59d {+17h 06m 21s}  -20.09d {-20d 05' 35"}
MOON_DIST:        64.87 [deg]
MOON_ILLUM:      86 [%]
GAL_COORDS:      297.61,  2.18 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      216.12,-52.12 [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:     Mon 22 Apr 19 23:10:35 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     899979,   Seg_Num: 0
POINT_RA:        182.094d {+12h 08m 23s} (J2000)
POINT_DEC:       -60.243d {-60d 14' 35"} (J2000)
ROLL:            215.798d
IMG_START_DATE:  18595 TJD;   112 DOY;   19/04/22
IMG_START_TIME:  83061.18 SOD {23:04:21.18} UT,   532.0 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     577667083
X_OFFSET:        661 [pixels]
Y_OFFSET:        859 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       821
Y_GRB_POS:       1019
BINNING_INDEX:   1
IM_URL:          sw00899979000msuni0554.fits
SUN_POSTN:        30.34d {+02h 01m 21s}  +12.35d {+12d 21' 03"}
SUN_DIST:        127.78 [deg]   Sun_angle= -10.1 [hr] (East of Sun)
MOON_POSTN:      256.59d {+17h 06m 22s}  -20.09d {-20d 05' 37"}
MOON_DIST:        64.87 [deg]
MOON_ILLUM:      86 [%]
GAL_COORDS:      297.61,  2.18 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      216.12,-52.12 [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 22 Apr 19 23:09:48 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     899979,   Seg_Num: 0
GRB_RA:          182.0361d {+12h 08m 08.66s} (J2000),
                 182.2906d {+12h 09m 09.73s} (current),
                 181.3812d {+12h 05m 31.47s} (1950)
GRB_DEC:         -60.2232d {-60d 13' 23.5"} (J2000),
                 -60.3306d {-60d 19' 50.1"} (current),
                 -59.9449d {-59d 56' 41.7"} (1950)
GRB_ERROR:       4.1 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  18595 TJD;   112 DOY;   19/04/22
IMG_START_TIME:  83065.00 SOD {23:04:25.00} UT,   535.8 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:        30.34d {+02h 01m 21s}  +12.35d {+12d 21' 03"}
SUN_DIST:        127.78 [deg]   Sun_angle= -10.1 [hr] (East of Sun)
MOON_POSTN:      256.58d {+17h 06m 20s}  -20.09d {-20d 05' 33"}
MOON_DIST:        64.89 [deg]
MOON_ILLUM:      86 [%]
GAL_COORDS:      297.58,  2.20 [deg] galactic lon,lat of the burst
ECL_COORDS:      216.06,-52.12 [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:     Mon 22 Apr 19 23:14:52 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     899979,   Seg_Num: 0
POINT_RA:        182.089d {+12h 08m 21s} (J2000)
POINT_DEC:       -60.244d {-60d 14' 37"} (J2000)
POINT_ROLL:      215.805d
IMG_START_DATE:  18595 TJD;   112 DOY;   19/04/22
IMG_START_TIME:  83395.00 SOD {23:09:55.00} UT,   865.8 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        3.294
N_STARS:         190
X_OFFSET:        102 [pixels]
Y_OFFSET:        300 [pixels]
X_MAX:           1541 [pixels]
Y_MAX:           1739 [pixels]
DET_THRESH:      15
PHOTO_THRESH:    8
SL_URL:          sw00899979000msufc0865.fits
SUN_POSTN:        30.34d {+02h 01m 22s}  +12.35d {+12d 21' 07"}
SUN_DIST:        127.78 [deg]   Sun_angle= -10.1 [hr] (East of Sun)
MOON_POSTN:      256.63d {+17h 06m 32s}  -20.10d {-20d 06' 00"}
MOON_DIST:        64.88 [deg]
MOON_ILLUM:      86 [%]
GAL_COORDS:      297.61,  2.18 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      216.12,-52.12 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 22 Apr 19 23:15:10 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     899979,   Seg_Num: 0
POINT_RA:        182.089d {+12h 08m 21s} (J2000)
POINT_DEC:       -60.244d {-60d 14' 37"} (J2000)
POINT_ROLL:      215.805d
IMG_START_DATE:  18595 TJD;   112 DOY;   19/04/22
IMG_START_TIME:  83395.00 SOD {23:09:55.00} UT,   865.8 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        3.294
N_STARS:         190
X_OFFSET:        102 [pixels]
Y_OFFSET:        300 [pixels]
X_MAX:           1541 [pixels]
Y_MAX:           1739 [pixels]
DET_THRESH:      15
PHOTO_THRESH:    8
SL_URL:          sw00899979000msufc0865.fits
SUN_POSTN:        30.34d {+02h 01m 22s}  +12.35d {+12d 21' 07"}
SUN_DIST:        127.78 [deg]   Sun_angle= -10.1 [hr] (East of Sun)
MOON_POSTN:      256.64d {+17h 06m 32s}  -20.10d {-20d 06' 01"}
MOON_DIST:        64.88 [deg]
MOON_ILLUM:      86 [%]
GAL_COORDS:      297.61,  2.18 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      216.12,-52.12 [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:     Mon 22 Apr 19 23:16:27 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     899979,   Seg_Num: 0
POINT_RA:        182.089d {+12h 08m 21s} (J2000)
POINT_DEC:       -60.244d {-60d 14' 37"} (J2000)
ROLL:            215.805d
IMG_START_DATE:  18595 TJD;   112 DOY;   19/04/22
IMG_START_TIME:  83395.00 SOD {23:09:55.00} UT,   865.8 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     577667417
X_OFFSET:        661 [pixels]
Y_OFFSET:        859 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       821
Y_GRB_POS:       1019
BINNING_INDEX:   1
IM_URL:          sw00899979000msuni0888.fits
SUN_POSTN:        30.34d {+02h 01m 22s}  +12.35d {+12d 21' 08"}
SUN_DIST:        127.78 [deg]   Sun_angle= -10.1 [hr] (East of Sun)
MOON_POSTN:      256.65d {+17h 06m 35s}  -20.10d {-20d 06' 08"}
MOON_DIST:        64.89 [deg]
MOON_ILLUM:      86 [%]
GAL_COORDS:      297.61,  2.18 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      216.12,-52.12 [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:     Mon 22 Apr 19 23:16:41 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     899979,   Seg_Num: 0
POINT_RA:        182.089d {+12h 08m 21s} (J2000)
POINT_DEC:       -60.244d {-60d 14' 37"} (J2000)
ROLL:            215.805d
IMG_START_DATE:  18595 TJD;   112 DOY;   19/04/22
IMG_START_TIME:  83395.00 SOD {23:09:55.00} UT,   865.8 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     577667417
X_OFFSET:        661 [pixels]
Y_OFFSET:        859 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       821
Y_GRB_POS:       1019
BINNING_INDEX:   1
IM_URL:          sw00899979000msuni0888.fits
SUN_POSTN:        30.34d {+02h 01m 22s}  +12.35d {+12d 21' 08"}
SUN_DIST:        127.78 [deg]   Sun_angle= -10.1 [hr] (East of Sun)
MOON_POSTN:      256.65d {+17h 06m 36s}  -20.10d {-20d 06' 09"}
MOON_DIST:        64.89 [deg]
MOON_ILLUM:      86 [%]
GAL_COORDS:      297.61,  2.18 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      216.12,-52.12 [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 Circular #24147
M. J. Moss (George Washington University), S. D. Barthelmy (GSFC), J.D. Gropp (PSU), J. A. Kennea (PSU), N. J. Klingler (PSU), N. P. M. Kuin (UCL-MSSL), A. Y. Lien (GSFC/UMBC), F. E. Marshall (NASA/GSFC), K. L. Page (U Leicester), M. H. Siegel (PSU) and A. Tohuvavohu (PSU) report on behalf of the Neil Gehrels Swift Observatory Team:
At 22:55:29 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 190422A (trigger=899979). Swift did not slew until ~T+8 min due to an observing constraint. The BAT on-board calculated location is RA, Dec 182.124, -60.238 which is
```
   RA(J2000) = 12h 08m 30s
   Dec(J2000) = -60d 14' 15"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a complex structure with a duration of at least 220 sec, where data are currently available. The peak count rate based on the available data was ~2000 counts/sec (15-350 keV), at ~175 sec after the trigger.
The XRT began observing the field at 23:04:18.5 UT, 529.3 seconds after the BAT trigger. Using promptly downlinked data we find an uncatalogued X-ray source located at RA, Dec 182.03650, -60.22311 which is equivalent to:
```
   RA(J2000)  = 12h 08m 08.76s
   Dec(J2000) = -60d 13' 23.2"
```
with an uncertainty of 3.8 arcseconds (radius, 90% containment). This location is 165 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 gives a column density in excess of the Galactic value (8.59 x 10^21 cm^-2, Willingale et al. 2013), with an excess column of 1.1 (+1.25/-0.89) x 10^22 cm^-2 (90% confidence).
UVOT took a finding chart exposure of 150 seconds with the White filter starting 531 seconds after the BAT trigger. No credible afterglow candidate has been found in the initial data products. The 2.7'x2.7' sub-image covers none of the XRT error circle. The 8'x8' region for the list of sources generated on-board covers 100% of the XRT error circle. The list of sources is typically complete to about 18 mag. No correction has been made for the large, but uncertain, extinction expected.
This source lies within the current (Sector 11) field-of-view of TESS camera 2.
Burst Advocate for this burst is M. J. Moss (mikejmoss3 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 NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 22 Apr 19 23:15:41 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     899979,   Seg_Num: 0
GRB_RA:          182.0355d {+12h 08m 08.52s} (J2000),
                 182.2900d {+12h 09m 09.59s} (current),
                 181.3806d {+12h 05m 31.33s} (1950)
GRB_DEC:         -60.2248d {-60d 13' 29.2"} (J2000),
                 -60.3322d {-60d 19' 55.9"} (current),
                 -59.9465d {-59d 56' 47.4"} (1950)
GRB_ERROR:       2.4 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  18595 TJD;   112 DOY;   19/04/22
IMG_START_TIME:  83065.00 SOD {23:04:25.00} UT,   535.8 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:        30.34d {+02h 01m 22s}  +12.35d {+12d 21' 08"}
SUN_DIST:        127.78 [deg]   Sun_angle= -10.1 [hr] (East of Sun)
MOON_POSTN:      256.64d {+17h 06m 34s}  -20.10d {-20d 06' 04"}
MOON_DIST:        64.91 [deg]
MOON_ILLUM:      86 [%]
GAL_COORDS:      297.58,  2.20 [deg] galactic lon,lat of the burst
ECL_COORDS:      216.07,-52.12 [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:        This position was enhanced using UVOT field astrometry.  
COMMENTS:        The probability that this is a serendipitous source in the  
COMMENTS:        SPER window is 0.58% < P(seren) < 1.1%.

GCN Circular #24148
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-IAC robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Spain (IAC Teide Observatory) started inspect of the Fermi GRB190422.67 ( 12h 36m 55.20s , -54d 57m 00.00s, R=7.96) errorbox 22200 sec after trigger time at 2019-04-22 22:15:04 UT, with upper limit up to 17.1 mag. The observations began at zenit distance = 85 deg. The sun altitude is -33.1 deg.
MASTER-OAFA robotic telescope located in Argentina (OAFA observatory of San Juan National University) started inspect of the Fermi GRB190422.67 errorbox 24752 sec after trigger time at 2019-04-22 22:57:37 UT, with upper limit up to 17.6 mag. Observations started at twilight. The observations began at zenit distance = 50 deg. The sun altitude is -11.4 deg.
The galactic latitude b = -60 deg., longitude l = 98 deg.
Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=1000359
We obtain a following upper limits.

Tmid-T0  |      Date Time      |          Site       |             Coord (J2000)          |Filt.| Expt. | Limit| Comment
_________|_____________________|_____________________|____________________________________|_____|_______|_______|________


   22290 | 2019-04-22 22:15:04 |          MASTER-IAC | ( 13h  8m 49.48s , -49d 50m 04.89s) |   C |   180 | 16.5 |        
   22290 | 2019-04-22 22:15:04 |          MASTER-IAC | ( 13h 21m 27.24s , -49d 53m 16.96s) |   C |   180 | 16.1 |        
   22518 | 2019-04-22 22:18:52 |          MASTER-IAC | ( 13h  8m 49.73s , -49d 49m 45.20s) |   C |   180 | 16.6 |        
   22518 | 2019-04-22 22:18:52 |          MASTER-IAC | ( 13h 21m 27.30s , -49d 52m 57.18s) |   C |   180 | 16.3 |        
   22973 | 2019-04-22 22:26:27 |          MASTER-IAC | ( 13h 21m 25.93s , -49d 53m 15.20s) |   C |   180 | 16.7 |        
   22973 | 2019-04-22 22:26:27 |          MASTER-IAC | ( 13h  8m 48.45s , -49d 50m 06.11s) |   C |   180 | 17.0 |        
   23202 | 2019-04-22 22:30:16 |          MASTER-IAC | ( 13h  8m 50.02s , -49d 50m 08.74s) |   C |   180 | 17.1 |        
   23202 | 2019-04-22 22:30:16 |          MASTER-IAC | ( 13h 21m 27.28s , -49d 53m 16.75s) |   C |   180 | 16.8 |        
   24763 | 2019-04-22 22:57:37 |         MASTER-OAFA | ( 12h  7m 16.02s , -60d  7m 13.60s) |   C |    20 | 16.4 |        
   24792 | 2019-04-22 22:58:01 |          MASTER-IAC | ( 12h  6m 27.16s , -53d  7m 29.24s) |  P- |    30 | 15.2 |        
   24792 | 2019-04-22 22:58:01 |          MASTER-IAC | ( 12h  7m 33.15s , -53d  9m 58.65s) |  P| |    30 | 15.1 |        
   24832 | 2019-04-22 22:58:36 |         MASTER-OAFA | ( 12h  7m 16.20s , -60d  7m 15.15s) |   C |    40 | 16.7 |        
   24863 | 2019-04-22 22:59:07 |          MASTER-IAC | ( 12h  7m 00.67s , -53d  8m 05.99s) |  P- |    40 | 15.3 |        
   24863 | 2019-04-22 22:59:07 |          MASTER-IAC | ( 12h  8m 06.57s , -53d 10m 34.27s) |  P| |    40 | 15.4 |        
   24915 | 2019-04-22 22:59:54 |         MASTER-OAFA | ( 12h  7m 16.40s , -60d  7m 16.70s) |   C |    50 | 16.8 |        
   24948 | 2019-04-22 23:00:22 |          MASTER-IAC | ( 12h  7m 00.38s , -53d 45m 45.99s) |  P- |    60 | 15.7 |        
   24948 | 2019-04-22 23:00:22 |          MASTER-IAC | ( 12h  8m 07.13s , -53d 48m 13.24s) |  P| |    60 | 15.7 |        
   25017 | 2019-04-22 23:01:26 |         MASTER-OAFA | ( 12h  7m 16.48s , -60d  7m 17.62s) |   C |    70 | 17.0 |        
   25060 | 2019-04-22 23:02:04 |          MASTER-IAC | ( 12h  7m 01.44s , -53d 46m 23.47s) |  P- |    80 | 15.9 |        
   25060 | 2019-04-22 23:02:04 |          MASTER-IAC | ( 12h  8m 08.15s , -53d 48m 49.88s) |  P| |    80 | 15.9 |        
   25136 | 2019-04-22 23:03:15 |         MASTER-OAFA | ( 12h  7m 16.59s , -60d  7m 18.78s) |   C |    90 | 17.2 |        
   25184 | 2019-04-22 23:03:58 |          MASTER-IAC | ( 12h  7m 01.70s , -53d 47m 24.89s) |  P- |   100 | 16.0 |        
   25184 | 2019-04-22 23:03:58 |          MASTER-IAC | ( 12h  8m 08.38s , -53d 49m 50.58s) |  P| |   100 | 16.0 |        
   25280 | 2019-04-22 23:05:24 |         MASTER-OAFA | ( 12h  7m 16.57s , -60d  7m 19.33s) |   C |   120 | 17.4 |        
   25334 | 2019-04-22 23:06:13 |          MASTER-IAC | ( 12h  7m 02.22s , -53d 46m 22.39s) |  P- |   130 | 16.0 |        
   25334 | 2019-04-22 23:06:13 |          MASTER-IAC | ( 12h  8m 08.81s , -53d 48m 47.66s) |  P| |   130 | 16.0 |        
   25455 | 2019-04-22 23:08:04 |         MASTER-OAFA | ( 12h  7m 16.54s , -60d  7m 19.63s) |   C |   150 | 17.5 |        
   25512 | 2019-04-22 23:08:56 |          MASTER-IAC | ( 12h  7m 02.44s , -53d 31m 39.33s) |  P- |   160 | 16.1 |        
   25512 | 2019-04-22 23:08:56 |          MASTER-IAC | ( 12h  8m 08.63s , -53d 34m 04.09s) |  P| |   160 | 16.2 |        
   25658 | 2019-04-22 23:11:12 |         MASTER-OAFA | ( 12h  7m 16.45s , -60d  7m 19.73s) |   C |   180 | 17.6 |        
   25716 | 2019-04-22 23:12:10 |          MASTER-IAC | ( 12h  7m 03.58s , -53d 50m 03.12s) |  P- |   180 | 15.9 |        
   25716 | 2019-04-22 23:12:10 |          MASTER-IAC | ( 12h  8m 09.30s , -53d 52m 19.78s) |  P| |   180 | 16.0 |        
   25876 | 2019-04-22 23:14:50 |         MASTER-OAFA | ( 12h  7m 16.30s , -60d  7m 19.71s) |   C |   180 | 17.6 |        
   25948 | 2019-04-22 23:16:02 |          MASTER-IAC | ( 12h  7m 05.40s , -53d 49m 25.20s) |  P- |   180 | 15.7 |        
   25952 | 2019-04-22 23:16:06 |          MASTER-IAC | ( 12h  8m 11.03s , -53d 51m 41.65s) |  P| |   180 | 15.9 |        
   26184 | 2019-04-22 23:19:58 |          MASTER-IAC | ( 12h  8m 10.96s , -53d 55m 24.75s) |  P| |   180 | 15.9 |        
   26184 | 2019-04-22 23:19:58 |          MASTER-IAC | ( 12h  7m 05.11s , -53d 53m 08.62s) |  P- |   180 | 15.8 |        
   26413 | 2019-04-22 23:23:47 |          MASTER-IAC | ( 12h  8m 11.60s , -53d 47m 46.13s) |  P| |   180 | 16.0 |        
   26413 | 2019-04-22 23:23:47 |          MASTER-IAC | ( 12h  7m 05.87s , -53d 45m 30.02s) |  P- |   180 | 15.9 |        
   26647 | 2019-04-22 23:27:41 |          MASTER-IAC | ( 12h  7m 07.09s , -53d 44m 51.54s) |  P- |   180 | 16.0 |        
   26648 | 2019-04-22 23:27:42 |          MASTER-IAC | ( 12h  8m 12.93s , -53d 47m 07.24s) |  P| |   180 | 16.0 |        
   26889 | 2019-04-22 23:31:43 |          MASTER-IAC | ( 12h  8m 14.25s , -54d  1m 56.91s) |   C |   180 | 15.8 |

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

GCN Circular #24149
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) started inspect of the Fermi GRB190422.96 ( 12h 34m 43.20s , -60d 55m 12.00s, R=4.87) errorbox 12 sec after trigger time at 2019-04-22 22:58:36 UT, with upper limit up to 17.6 mag. Observations started at twilight. The observations began at zenit distance = 50 deg. The sun altitude is -11.6 deg.
The galactic latitude b = -60 deg., longitude l = 98 deg.
Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=1000695
We obtain a following upper limits.
```
Tmid-T0  |      Date Time      |          Site       |             Coord (J2000)          |Filt.| Expt. | Limit| Comment
_________|_____________________|_____________________|____________________________________|_____|_______|_______|________


      32 | 2019-04-22 22:58:36 |         MASTER-OAFA | ( 12h  7m 16.20s , -60d  7m 15.15s) |   C |    40 | 16.7 |        
     115 | 2019-04-22 22:59:54 |         MASTER-OAFA | ( 12h  7m 16.40s , -60d  7m 16.70s) |   C |    50 | 16.8 |        
     217 | 2019-04-22 23:01:26 |         MASTER-OAFA | ( 12h  7m 16.48s , -60d  7m 17.62s) |   C |    70 | 17.0 |        
     337 | 2019-04-22 23:03:15 |         MASTER-OAFA | ( 12h  7m 16.59s , -60d  7m 18.78s) |   C |    90 | 17.2 |        
     481 | 2019-04-22 23:05:24 |         MASTER-OAFA | ( 12h  7m 16.57s , -60d  7m 19.33s) |   C |   120 | 17.4 |        
     655 | 2019-04-22 23:08:04 |         MASTER-OAFA | ( 12h  7m 16.54s , -60d  7m 19.63s) |   C |   150 | 17.5 |        
     859 | 2019-04-22 23:11:12 |         MASTER-OAFA | ( 12h  7m 16.45s , -60d  7m 19.73s) |   C |   180 | 17.6 |        
    1077 | 2019-04-22 23:14:50 |         MASTER-OAFA | ( 12h  7m 16.30s , -60d  7m 19.71s) |   C |   180 | 17.6 |        
```
Filter C is a clear (unfiltred) band.
The observation and reduction will continue. The message may be cited.
GCN Circular #24150
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 GRB190422.96 ( 12h 8m 29.76s , -60d 14m 16.80s, R=0.05) errorbox 128 sec after trigger time at 2019-04-22 22:57:37 UT, with upper limit up to 17.7 mag. Observations started at twilight. The observations began at zenit distance = 47 deg. The sun altitude is -11.4 deg.
The galactic latitude b = -60 deg., longitude l = 98 deg.
Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=1000655
We obtain a following upper limits.
```
Tmid-T0  |          Site       |Filt.| Expt. | Limit| Comment
_________|_____________________|_____|_______|______|________


     138 |         MASTER-OAFA |   C |    20 | 16.4 |        
     207 |         MASTER-OAFA |   C |    40 | 16.7 |        
     290 |         MASTER-OAFA |   C |    50 | 16.8 |        
     392 |         MASTER-OAFA |   C |    70 | 17.0 |        
     512 |         MASTER-OAFA |   C |    90 | 17.2 |        
     656 |         MASTER-OAFA |   C |   120 | 17.4 |        
     830 |         MASTER-OAFA |   C |   150 | 17.5 |        
    1034 |         MASTER-OAFA |   C |   180 | 17.6 |        
    1252 |         MASTER-OAFA |   C |   180 | 17.6 |        
    1471 |         MASTER-OAFA |   C |   180 | 17.7 |        
    1690 |         MASTER-OAFA |   C |   180 | 17.7 |        
    1909 |         MASTER-OAFA |   C |   180 | 17.7 |        
    2130 |         MASTER-OAFA |   C |   180 | 17.7 |        
    2348 |         MASTER-OAFA |   C |   180 | 17.7 |        
    2567 |         MASTER-OAFA |   C |   180 | 17.7 |        
```
Filter C is a clear (unfiltred) band.
The observation and reduction will continue. The message may be cited.
GCN Circular #24151
P.A. Evans, M.R. Goad, J.P. Osborne and A.P. Beardmore (U. Leicester) report on behalf of the Swift-XRT team.
Using 1699 s of XRT Photon Counting mode data and 1 UVOT images for GRB 190422A, 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 = 182.03450, -60.22425 which is equivalent to:
```
RA (J2000): 12h 08m 8.28s
Dec (J2000): -60d 13' 27.3"
```
with an uncertainty of 1.8 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 #24155
D.N. Burrows (PSU), A. Tohuvavohu (PSU), A.P. Beardmore (U. Leicester), P.A. Evans (U. Leicester), J.P. Osborne (U. Leicester), A. D'Ai (INAF-IASFPA), A. Melandri (INAF-OAB), P. D'Avanzo (INAF-OAB), S. J. LaPorte (PSU) and M.J. Moss report on behalf of the Swift-XRT team:
We have analysed 6.8 ks of XRT data for GRB 190422A (Moss et al. GCN Circ. 24147), from 536 s to 31.0 ks after the BAT trigger. The data are entirely in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Evans et al. (GCN Circ. 24151).
The light curve can be modelled with a series of power-law decays. The initial decay index is alpha=3.7 (+1.8, -1.2). At T+895 s the decay flattens to an alpha of -0.4 (+0.4, -0.5) before breaking again at T+3926 s to a final decay with index alpha=0.54 (+/-0.15).
A spectrum formed from the PC mode data can be fitted with an absorbed power-law with a photon spectral index of 2.04 (+0.18, -0.17). The best-fitting absorption column is 1.66 (+0.25, -0.23) x 10^22 cm^-2, in excess of the Galactic value of 8.6 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 5.5 x 10^-11 (1.2 x 10^-10) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
```
Total column:	     1.66 (+0.25, -0.23) x 10^22 cm^-2
Galactic foreground: 8.6 x 10^21 cm^-2
Excess significance: 5.7 sigma
Photon index:	     2.04 (+0.18, -0.17)
```
If the light curve continues to decay with a power-law decay index of 0.54, the count rate at T+24 hours will be 0.11 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 6.3 x 10^-12 (1.4 x 10^-11) erg cm^-2 s^-1.
The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00899979.
This circular is an official product of the Swift-XRT team.
GCN Circular #24157
T. Sakamoto (AGU), S. D. Barthelmy (GSFC), J. R. Cummings (CPI), H. A. Krimm (NSF/USRA), A. Y. Lien (GSFC/UMBC), C. B. Markwardt (GSFC), M. J. Moss (GWU), D. M. Palmer (LANL), 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 190422A (trigger #899979) (Moss et al., GCN Circ. 24147). The BAT ground-calculated position is RA, Dec = 182.126, -60.167 deg which is
```
   RA(J2000)  =  12h 08m 30.3s
   Dec(J2000) = -60d 10' 02.6"
```
with an uncertainty of 2.4 arcmin, (radius, sys+stat, 90% containment). The partial coding was 82%.
The mask-weighted light curve shows a multi-peaked structure. The emission started before the source entered the BAT FOV, and lasted until ~T+360 s. The main peak occurred at ~ T+175 s. We cannot determine T90 since the available data do not cover the entire burst emission.
The time-averaged spectrum from T+6.39 to T+359.48 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.76 +- 0.08. The fluence in the 15-150 keV band is 6.5 +- 0.3 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+174.47 sec in the 15-150 keV band is 2.6 +- 0.2 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/899979/BA/
GCN Circular #24159
GRB 190422A: Swift/UVOT Upper Limits
K. K. Simpson (PSU) and M. J. Moss (George Washington University) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 190422A 532 s after the BAT trigger (Moss et al., GCN Circ. 24147). No optical afterglow consistent with the XRT position (Evans et al. GCN Circ. 24151) 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           532          682          147         >18.8
white              532         7906          647         >18.8
v                  689         6879          352         >17.2
b                  788         7700          352         >18.3
u                  763         7495          352         >18.9
w1                 738         7289          352         >19.1
m2                 713         7084          352         >19.1
w2                 838         7995          438         >19.6
```
The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 1.58 in the direction of the burst (Schlegel et al. 1998).
GCN Circular #24161
R. Hamburg (UAH), C. Fletcher (USRA), and C. Meegan (UAH) report on behalf of the Fermi GBM Team:
"At 22:58:24.00 UT on 22 April 2019, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 190422A (trigger 577666709 / 190422957) which was also detected by the Swift/BAT (Moss et al. 2019, GCN 24147). The GBM on-ground location is consistent with the Swift position.
The angle from the Fermi LAT boresight at the GBM trigger time is 71 degrees.
The GBM light curve shows a complex lightcurve with one main peak preceded and followed by weaker bursts of emission. A duration (T90) is calculated to be about 212 s (50-300 keV). The time-averaged spectrum from T0-21.5 s to T0+42.0 s is best fit by a power law function with an exponential high-energy cutoff. The power law index is -1.67 +/- 0.09 and the cutoff energy, parameterized as Epeak, is 58 +/- 7 keV. A Band function fits the spectrum equally well with Epeak = 50 +/- 9 keV, alpha = -1.57 +/- 0.14 and beta = -2.42 +/- 0.27.
The event fluence (10-1000 keV) in this time interval is (4.8 +/- 0.3)E-06 erg/cm^2. The 1-sec peak photon flux measured starting from T0+1.54 s in the 10-1000 keV band is 4.84 +/- 0.17 ph/s/cm^2."
The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog: https://heasarc.gsfc.nasa.gov/W3Browse/fermi/fermigbrst.html
For Fermi GBM data and info, please visit the official Fermi GBM Support Page: https://fermi.gsfc.nasa.gov/ssc/data/access/gbm/

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Jochen Greiner, last update: 24-Apr-2019 [Disclaimer]