Gamma-ray Burst 190727B

(All information courtesy of the instrument teams.)

Previous IAU Circulars

• none

• GCN/BACODINE POSITION NOTICE
  

  TITLE:           GCN/SWIFT NOTICE
  NOTICE_DATE:     Sat 27 Jul 19 20:18:29 UT
  NOTICE_TYPE:     Swift-BAT GRB Position
  TRIGGER_NUM:     916733,   Seg_Num: 0
  GRB_RA:          126.481d {+08h 25m 55s} (J2000),
                   126.711d {+08h 26m 51s} (current),
                   125.893d {+08h 23m 34s} (1950)
  GRB_DEC:         -13.268d {-13d 16' 03"} (J2000),
                   -13.333d {-13d 19' 57"} (current),
                   -13.103d {-13d 06' 11"} (1950)
  GRB_ERROR:       3.00 [arcmin radius, statistical only]
  GRB_INTEN:       533 [cnts]    Image_Peak=62 [image_cnts]
  TRIGGER_DUR:     0.064 [sec] 
  TRIGGER_INDEX:   10427     E_range: 50-350 keV
  BKG_INTEN:       11677 [cnts]
  BKG_TIME:        73080.68 SOD {20:18:00.68} UT
  BKG_DUR:         8 [sec]
  GRB_DATE:        18691 TJD;   208 DOY;   19/07/27
  GRB_TIME:        73097.00 SOD {20:18:17.00} UT
  GRB_PHI:         -112.31 [deg]
  GRB_THETA:        25.54 [deg]
  SOLN_STATUS:     0x20000003
  RATE_SIGNIF:     11.70 [sigma]
  IMAGE_SIGNIF:    7.74 [sigma]
  MERIT_PARAMS:     +1  +0  +0  -4  +3  -2 -100  +0 -84  +0 
  SUN_POSTN:       126.86d {+08h 27m 26s}  +19.13d {+19d 07' 44"}
  SUN_DIST:         32.46 [deg]   Sun_angle= 0.0 [hr] (West of Sun)
  MOON_POSTN:       66.23d {+04h 24m 55s}  +18.25d {+18d 15' 08"}
  MOON_DIST:        67.48 [deg]
  MOON_ILLUM:      23 [%]
  GAL_COORDS:      236.13, 14.03 [deg] galactic lon,lat of the burst (or transient)
  ECL_COORDS:      132.72,-31.46 [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 = 227.41,-9.44 [deg].
  COMMENTS:           
  COMMENTS:        NOTE: This BAT event is temporally(21.0<100sec) coincident with the FERMI_GBM event (trignum=585951481).  
  

• red DSS finding chart ps-file
  
  
• GCN NOTICE
  

  TITLE:           GCN/FERMI NOTICE
  NOTICE_DATE:     Sat 27 Jul 19 20:18:43 UT
  NOTICE_TYPE:     Fermi-GBM Flight Position
  RECORD_NUM:      69
  TRIGGER_NUM:     585951481
  GRB_RA:          133.950d {+08h 55m 48s} (J2000),
                   134.179d {+08h 56m 43s} (current),
                   133.365d {+08h 53m 28s} (1950)
  GRB_DEC:         -15.433d {-15d 25' 59"} (J2000),
                   -15.509d {-15d 30' 32"} (current),
                   -15.241d {-15d 14' 27"} (1950)
  GRB_ERROR:       4.97 [deg radius, statistical plus systematic]
  GRB_INTEN:       984 [cnts/sec]
  DATA_SIGNIF:     64.70 [sigma]
  INTEG_TIME:      2.048 [sec]
  GRB_DATE:        18691 TJD;   208 DOY;   19/07/27
  GRB_TIME:        73076.45 SOD {20:17:56.45} UT
  GRB_PHI:         346.00 [deg]
  GRB_THETA:        45.00 [deg]
  DATA_TIME_SCALE: 2.0480 [sec]
  HARD_RATIO:      1.05
  LOC_ALGORITHM:   3 (version number of)
  MOST_LIKELY:      94%  GRB
  2nd_MOST_LIKELY:   4%  Solar Flare
  SUN_POSTN:       126.86d {+08h 27m 26s}  +19.13d {+19d 07' 44"}
  SUN_DIST:         35.38 [deg]   Sun_angle= -0.5 [hr] (East of Sun)
  MOON_POSTN:       66.23d {+04h 24m 56s}  +18.25d {+18d 15' 09"}
  MOON_DIST:        74.94 [deg]
  MOON_ILLUM:      23 [%]
  GAL_COORDS:      242.26, 18.76 [deg] galactic lon,lat of the burst (or transient)
  ECL_COORDS:      141.57,-31.35 [deg] ecliptic lon,lat of the burst (or transient)
  LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn190727846/quicklook/glg_lc_medres34_bn190727846.gif
  COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
  COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.  
  COMMENTS:           
  COMMENTS:        NOTE: This GBM event is temporally(21.0<100sec) coincident with the SWIFT_BAT event (trignum=916733).  
  

• GCN NOTICE
  

  TITLE:           GCN/FERMI NOTICE
  NOTICE_DATE:     Sat 27 Jul 19 20:18:21 UT
  NOTICE_TYPE:     Fermi-GBM Flight Position
  RECORD_NUM:      47
  TRIGGER_NUM:     585951481
  GRB_RA:          143.150d {+09h 32m 36s} (J2000),
                   143.372d {+09h 33m 29s} (current),
                   142.584d {+09h 30m 20s} (1950)
  GRB_DEC:         -23.950d {-23d 56' 59"} (J2000),
                   -24.037d {-24d 02' 13"} (current),
                   -23.728d {-23d 43' 40"} (1950)
  GRB_ERROR:       11.80 [deg radius, statistical plus systematic]
  GRB_INTEN:       483 [cnts/sec]
  DATA_SIGNIF:     16.80 [sigma]
  INTEG_TIME:      0.512 [sec]
  GRB_DATE:        18691 TJD;   208 DOY;   19/07/27
  GRB_TIME:        73076.45 SOD {20:17:56.45} UT
  GRB_PHI:         329.00 [deg]
  GRB_THETA:        40.00 [deg]
  DATA_TIME_SCALE: 0.5120 [sec]
  HARD_RATIO:      0.91
  LOC_ALGORITHM:   3 (version number of)
  MOST_LIKELY:      97%  GRB
  2nd_MOST_LIKELY:   1%  Generic Transient
  SUN_POSTN:       126.86d {+08h 27m 26s}  +19.13d {+19d 07' 44"}
  SUN_DIST:         46.07 [deg]   Sun_angle= -1.1 [hr] (East of Sun)
  MOON_POSTN:       66.23d {+04h 24m 55s}  +18.25d {+18d 15' 07"}
  MOON_DIST:        86.25 [deg]
  MOON_ILLUM:      23 [%]
  GAL_COORDS:      255.07, 19.93 [deg] galactic lon,lat of the burst (or transient)
  ECL_COORDS:      154.98,-36.19 [deg] ecliptic lon,lat of the burst (or transient)
  LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn190727846/quicklook/glg_lc_medres34_bn190727846.gif
  COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
  COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.  
  

• GCN NOTICE
  

  TITLE:           GCN/FERMI NOTICE
  NOTICE_DATE:     Sat 27 Jul 19 20:18:52 UT
  NOTICE_TYPE:     Fermi-GBM Flight Position
  RECORD_NUM:      89
  TRIGGER_NUM:     585951481
  GRB_RA:          144.133d {+09h 36m 32s} (J2000),
                   144.356d {+09h 37m 25s} (current),
                   143.564d {+09h 34m 15s} (1950)
  GRB_DEC:         -23.533d {-23d 31' 59"} (J2000),
                   -23.622d {-23d 37' 17"} (current),
                   -23.308d {-23d 18' 30"} (1950)
  GRB_ERROR:       4.58 [deg radius, statistical plus systematic]
  GRB_INTEN:       1785 [cnts/sec]
  DATA_SIGNIF:     169.80 [sigma]
  INTEG_TIME:      4.096 [sec]
  GRB_DATE:        18691 TJD;   208 DOY;   19/07/27
  GRB_TIME:        73076.45 SOD {20:17:56.45} UT
  GRB_PHI:         329.00 [deg]
  GRB_THETA:        40.00 [deg]
  DATA_TIME_SCALE: 4.0960 [sec]
  HARD_RATIO:      0.76
  LOC_ALGORITHM:   3 (version number of)
  MOST_LIKELY:      97%  GRB
  2nd_MOST_LIKELY:   2%  Generic Transient
  SUN_POSTN:       126.86d {+08h 27m 26s}  +19.13d {+19d 07' 44"}
  SUN_DIST:         46.03 [deg]   Sun_angle= -1.2 [hr] (East of Sun)
  MOON_POSTN:       66.23d {+04h 24m 56s}  +18.25d {+18d 15' 11"}
  MOON_ILLUM:      23 [%]
  GAL_COORDS:      255.42, 20.87 [deg] galactic lon,lat of the burst (or transient)
  ECL_COORDS:      155.79,-35.45 [deg] ecliptic lon,lat of the burst (or transient)
  LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn190727846/quicklook/glg_lc_medres34_bn190727846.gif
  COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
  COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.  
  COMMENTS:           
  COMMENTS:        NOTE: This GBM event is temporally(21.0<100sec) coincident with the SWIFT_BAT event (trignum=916733).  
  

• GCN NOTICE
  

  TITLE:           GCN/FERMI NOTICE
  NOTICE_DATE:     Sat 27 Jul 19 20:18:37 UT
  NOTICE_TYPE:     Fermi-GBM Ground Position
  RECORD_NUM:      57
  TRIGGER_NUM:     585951481
  GRB_RA:          126.610d {+08h 26m 26s} (J2000),
                   126.823d {+08h 27m 17s} (current),
                   126.066d {+08h 24m 16s} (1950)
  GRB_DEC:         -23.420d {-23d 25' 11"} (J2000),
                   -23.485d {-23d 29' 05"} (current),
                   -23.255d {-23d 15' 17"} (1950)
  GRB_ERROR:       3.56 [deg radius, statistical only]
  DATA_SIGNIF:     29.40 [sigma]
  DATA_INTERVAL:   4.096 [sec]
  GRB_DATE:        18691 TJD;   208 DOY;   19/07/27
  GRB_TIME:        73076.45 SOD {20:17:56.45} UT
  GRB_PHI:         353.00 [deg]
  GRB_THETA:        36.00 [deg]
  E_RANGE:         44.032 - 279.965 [keV]
  LOC_ALGORITHM:   4153 (Gnd S/W Version number)
  SUN_POSTN:       126.86d {+08h 27m 26s}  +19.13d {+19d 07' 44"}
  SUN_DIST:         42.61 [deg]   Sun_angle= 0.0 [hr] (West of Sun)
  MOON_POSTN:       66.23d {+04h 24m 55s}  +18.25d {+18d 15' 09"}
  MOON_DIST:        72.37 [deg]
  MOON_ILLUM:      23 [%]
  GAL_COORDS:      244.81,  8.49 [deg] galactic lon,lat of the burst (or transient)
  ECL_COORDS:      136.59,-41.12 [deg] ecliptic lon,lat of the burst (or transient)
  LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn190727846/quicklook/glg_lc_medres34_bn190727846.gif
  POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_585951481.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.  
  COMMENTS:           
  COMMENTS:        NOTE: This GBM event is temporally(21.0<100sec) coincident with the SWIFT_BAT event (trignum=916733).  
  

• GCN NOTICE
  

  TITLE:           GCN/FERMI NOTICE
  NOTICE_DATE:     Sat 27 Jul 19 20:18:36 UT
  NOTICE_TYPE:     Fermi-GBM Flight Position
  RECORD_NUM:      58
  TRIGGER_NUM:     585951481
  GRB_RA:          129.217d {+08h 36m 52s} (J2000),
                   129.453d {+08h 37m 49s} (current),
                   128.613d {+08h 34m 27s} (1950)
  GRB_DEC:          -9.633d {-09d 37' 59"} (J2000),
                    -9.702d {-09d 42' 07"} (current),
                    -9.458d {-09d 27' 29"} (1950)
  GRB_ERROR:       7.90 [deg radius, statistical plus systematic]
  GRB_INTEN:       297 [cnts/sec]
  DATA_SIGNIF:     27.60 [sigma]
  INTEG_TIME:      4.096 [sec]
  GRB_DATE:        18691 TJD;   208 DOY;   19/07/27
  GRB_TIME:        73076.45 SOD {20:17:56.45} UT
  GRB_PHI:         353.00 [deg]
  GRB_THETA:        50.00 [deg]
  DATA_TIME_SCALE: 4.0960 [sec]
  HARD_RATIO:      0.91
  LOC_ALGORITHM:   3 (version number of)
  MOST_LIKELY:      95%  GRB
  2nd_MOST_LIKELY:   3%  Solar Flare
  SUN_POSTN:       126.86d {+08h 27m 26s}  +19.13d {+19d 07' 44"}
  SUN_DIST:         28.94 [deg]   Sun_angle= -0.2 [hr] (East of Sun)
  MOON_POSTN:       66.23d {+04h 24m 55s}  +18.25d {+18d 15' 08"}
  MOON_DIST:        68.35 [deg]
  MOON_ILLUM:      23 [%]
  GAL_COORDS:      234.46, 18.26 [deg] galactic lon,lat of the burst (or transient)
  ECL_COORDS:      134.50,-27.22 [deg] ecliptic lon,lat of the burst (or transient)
  LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn190727846/quicklook/glg_lc_medres34_bn190727846.gif
  COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
  COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.  
  COMMENTS:           
  COMMENTS:        NOTE: This GBM event is temporally(21.0<100sec) coincident with the SWIFT_BAT event (trignum=916733).  
  

• GCN NOTICE
  

  TITLE:           GCN/FERMI NOTICE
  NOTICE_DATE:     Sat 27 Jul 19 20:19:51 UT
  NOTICE_TYPE:     Fermi-GBM Ground Position
  RECORD_NUM:      2
  TRIGGER_NUM:     585951481
  GRB_RA:          126.250d {+08h 25m 00s} (J2000),
                   126.459d {+08h 25m 50s} (current),
                   125.716d {+08h 22m 52s} (1950)
  GRB_DEC:         -25.380d {-25d 22' 47"} (J2000),
                   -25.445d {-25d 26' 39"} (current),
                   -25.216d {-25d 12' 58"} (1950)
  GRB_ERROR:       3.08 [deg radius, statistical only]
  DATA_SIGNIF:     26.80 [sigma]
  DATA_INTERVAL:   9.216 [sec]
  GRB_DATE:        18691 TJD;   208 DOY;   19/07/27
  GRB_TIME:        73076.45 SOD {20:17:56.45} UT
  GRB_PHI:         353.00 [deg]
  GRB_THETA:        34.00 [deg]
  E_RANGE:         44.032 - 279.965 [keV]
  LOC_ALGORITHM:   41531 (Gnd S/W Version number)
  SUN_POSTN:       126.86d {+08h 27m 26s}  +19.13d {+19d 07' 43"}
  SUN_DIST:         44.58 [deg]   Sun_angle= 0.0 [hr] (West of Sun)
  MOON_POSTN:       66.24d {+04h 24m 58s}  +18.26d {+18d 15' 18"}
  MOON_DIST:        73.06 [deg]
  MOON_ILLUM:      23 [%]
  GAL_COORDS:      246.25,  7.11 [deg] galactic lon,lat of the burst (or transient)
  ECL_COORDS:      137.01,-43.08 [deg] ecliptic lon,lat of the burst (or transient)
  LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn190727846/quicklook/glg_lc_medres34_bn190727846.gif
  POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_585951481.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(1.0<100sec) coincident with the INTEGRAL_SPIACS event (trignum=8338).  
  

• GCN NOTICE
  

  TITLE:           GCN/FERMI NOTICE
  NOTICE_DATE:     Sat 27 Jul 19 20:27:09 UT
  NOTICE_TYPE:     Fermi-GBM Final Position
  RECORD_NUM:      0
  TRIGGER_NUM:     585951481
  GRB_RA:          130.560d {+08h 42m 14s} (J2000),
                   130.788d {+08h 43m 09s} (current),
                   129.979d {+08h 39m 55s} (1950)
  GRB_DEC:         -15.660d {-15d 39' 35"} (J2000),
                   -15.731d {-15d 43' 51"} (current),
                   -15.480d {-15d 28' 47"} (1950)
  GRB_ERROR:       1.00 [deg radius, statistical only]
  GRB_DATE:        18691 TJD;   208 DOY;   19/07/27
  GRB_TIME:        73076.45 SOD {20:17:56.45} UT
  GRB_PHI:         351.00 [deg]
  GRB_THETA:        44.00 [deg]
  E_RANGE:         44.032 - 279.965 [keV]
  LOC_ALGORITHM:   41531 (Gnd S/W Version number)
  SUN_POSTN:       126.86d {+08h 27m 27s}  +19.13d {+19d 07' 39"}
  SUN_DIST:         35.07 [deg]   Sun_angle= -0.3 [hr] (East of Sun)
  MOON_POSTN:       66.31d {+04h 25m 15s}  +18.27d {+18d 16' 14"}
  MOON_DIST:        72.01 [deg]
  MOON_ILLUM:      23 [%]
  GAL_COORDS:      240.46, 15.98 [deg] galactic lon,lat of the burst (or transient)
  ECL_COORDS:      138.00,-32.59 [deg] ecliptic lon,lat of the burst (or transient)
  LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn190727846/quicklook/glg_lc_medres34_bn190727846.gif
  LOC_URL:         http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn190727846/quicklook/glg_locplot_all_bn190727846.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(1.0<100sec) coincident with the INTEGRAL_SPIACS event (trignum=8338).  
  

• GCN NOTICE
  

  TITLE:           GCN/SWIFT NOTICE
  NOTICE_DATE:     Sat 27 Jul 19 20:21:46 UT
  NOTICE_TYPE:     Swift-BAT GRB Lightcurve
  TRIGGER_NUM:     916733,   Seg_Num: 0
  GRB_RA:          126.481d {+08h 25m 55s} (J2000),
                   126.711d {+08h 26m 51s} (current),
                   125.893d {+08h 23m 34s} (1950)
  GRB_DEC:         -13.268d {-13d 16' 03"} (J2000),
                   -13.333d {-13d 19' 57"} (current),
                   -13.103d {-13d 06' 11"} (1950)
  GRB_DATE:        18691 TJD;   208 DOY;   19/07/27
  GRB_TIME:        73097.01 SOD {20:18:17.01} UT
  TRIGGER_INDEX:   10427
  GRB_PHI:         -112.31 [deg]
  GRB_THETA:        25.54 [deg]
  DELTA_TIME:      -32.00 [sec]
  TRIGGER_DUR:     0.064 [sec] 
  SOLN_STATUS:     0x3
  RATE_SIGNIF:     11.70 [sigma]
  IMAGE_SIGNIF:    7.74 [sigma]
  LC_URL:          sw00916733000msb.lc
  SUN_POSTN:       126.86d {+08h 27m 26s}  +19.13d {+19d 07' 42"}
  SUN_DIST:         32.46 [deg]   Sun_angle= 0.0 [hr] (West of Sun)
  MOON_POSTN:       66.26d {+04h 25m 03s}  +18.26d {+18d 15' 33"}
  MOON_DIST:        67.45 [deg]
  MOON_ILLUM:      23 [%]
  GAL_COORDS:      236.13, 14.03 [deg] galactic lon,lat of the burst (or transient)
  ECL_COORDS:      132.72,-31.46 [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 = 227.41,-9.44 [deg].
  

  
• GCN Circular #25176
  A. Y. Lien (GSFC/UMBC), M. G. Bernardini (INAF-OAB), P. D'Avanzo (INAF-OAB), J. A. Kennea (PSU), N. J. Klingler (PSU), A. Melandri (INAF-OAB), M. J. Moss (GWU), K. L. Page (U Leicester), D. M. Palmer (LANL) and A. Tohuvavohu (PSU) report on behalf of the Neil Gehrels Swift Observatory Team:
  At 20:18:17 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 190727B (trigger=916733). Swift could not slew to the location due to an observing constraint. The BAT on-board calculated location is RA, Dec 126.481, -13.268 which is

     RA(J2000) = 08h 25m 55s
     Dec(J2000) = -13d 16' 03"
  

  with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a complex structure with a duration of about 50 sec. The peak count rate was ~20,000 counts/sec (15-350 keV), at ~1 sec after the trigger.
  Due to a Sun observing constraint, Swift cannot slew to the BAT position until 16:42 UT on 2019 September 12. There will thus be no XRT or UVOT data for this trigger before this time.
  Burst Advocate for this burst is A. Y. Lien (amy.y.lien AT nasa.gov). 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 #25177
  The Fermi GBM team reports the detection of a likely LONG GRB
  At 20:17:56 UT on 27 Jul 2019, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 190727B (trigger 585951481.447196 / 190727846).
  The on-ground calculated location, using the Fermi GBM trigger data, is RA = 130.6, Dec = -15.7 (J2000 degrees, equivalent to J2000 08h 42m, -15d 41'), with a statistical uncertainty of 1.0 degrees.
  The angle from the Fermi LAT boresight is 44.0 degrees.
  The skymap can be found here: http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn190727846/quicklook/glg_skymap_all_bn190727846.png
  The HEALPix FITS file, including the estimated localization systematic, can be found here: http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn190727846/quicklook/glg_healpix_all_bn190727846.fit
  The GBM light curve can be found here: http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn190727846/quicklook/glg_lc_medres34_bn190727846.gif
• GCN Circular #25178
  B. Biltzinger, F. Kunzweiler, F. Berlato, J. Burgess & J. Greiner (all MPE Garching) report:
  The public trigdat data of the Fermi Gamma-ray Burst Monitor (GBM) trigger 585951481 at 20:17:56 on 27 July 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) = 128.2+/-0.3 deg
  Decl.(2000.0) = -12.2+/-0.5 deg
  

  We estimate an additional systematic error of 1 deg.
  Further details are available at: https://grb.mpe.mpg.de/grb/GRB190727846/
  The Healpix map can be downloaded from: https://grb.mpe.mpg.de/grb/GRB190727846/healpix
  The location parameters are available as JSON at: https://grb.mpe.mpg.de/grb/GRB190727846/json
• GCN Circular #25180
  P. Veres and C. Meegan (both UAH) report on behalf of the Fermi GBM Team:
  At 20:17:56.45 UT on 27 July 2019, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 190727B (trigger 585951481/190727846), which was also detected by the Swift/BAT (Lien et al., GCN 25176). The GBM on-ground location is consistent with the Swift position.
  The angle from the Fermi LAT boresight is 46 degrees.
  The GBM light curve consists of multiple overlapping pulses with a duration (T90) of about 35 s (50-300 keV). The time-averaged spectrum from T0 to T0+44 s is adequately fit by a power law function with an exponential high-energy cutoff. The power law index is -1.26 +/- 0.01 and the cutoff energy, parameterized as Epeak, is 621 +/- 26 keV.
  The event fluence (10-1000 keV) in this time interval is (7.02 +/- 0.05)E-05 erg/cm^2. The 1-second peak photon flux measured starting from T0+21.8 s in the 10-1000 keV band is 43.0 +/- 0.4 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 information, please visit the official Fermi GBM Support Page: https://fermi.gsfc.nasa.gov/ssc/data/access/gbm/
• GCN Circular #25186
  M. Kovacevic (INFN Perugia), D. Tak (Univ. of Maryland & NASA/GSFC), F. Longo (University and INFN, Trieste), M. Arimoto (Kanazawa Univ.), and M. Axelsson (KTH and Stockholm Univ.) report on behalf of the Fermi-LAT team:
  On July 27, 2019, Fermi-LAT detected high-energy emission from GRB 190727B, which was also detected by Fermi-GBM (Veres et al., GCN 25180) and Swift-BAT (Lien et al., GCN 25176).
  The best LAT on-ground location is found to be
  RA, Dec 126.19, -13.34 (degrees, J2000)
  with an error radius of 0.28 deg (90% containment, statistical error only). This was 46 deg from the LAT boresight at the time of the GBM trigger:
  T0 = 20:17:56.45 UT.
  The data from the Fermi-LAT show a significant increase in the event rate after the GBM trigger that is spatially correlated with the GBM emission with high significance. The photon flux above 100 MeV in the time interval 0-1500 s after the GBM trigger is (3.15 +/- 1.25)E-6 ph/cm2/s. The highest-energy photon in this interval is a 2.2 GeV event observed at T0 + 345 s. The estimated photon index above 100 MeV is -2.3 +/- 0.4.
  The Fermi-LAT point of contact for this burst is Milos Kovacevic (milos.kovacevic@pg.infn.it).
  The Fermi-LAT is a pair conversion telescope designed to cover the energy band from 20 MeV to greater than 300 GeV. It is the product of an international collaboration between NASA and DOE in the U.S. and many scientific institutions across France, Italy, Japan and Sweden.
• GCN Circular #25211
  M. Stamatikos (OSU), S. D. Barthelmy (GSFC), J. R. Cummings (CPI), H. A. Krimm (NSF), A. Y. Lien (GSFC/UMBC), C. B. Markwardt (GSFC), D. M. Palmer (LANL), T. Sakamoto (AGU), 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 190727B (trigger #916733) (Lien et al., GCN Circ. 25176). The BAT ground-calculated position is RA, Dec = 126.500, -13.272 deg which is

     RA(J2000)  =  08h 25m 59.9s
     Dec(J2000) = -13d 16' 18.9"
  

  with an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment). The partial coding was 70%.
  The mask-weighted light curve shows a structure with multiple bright pulses that starts at ~T-20 s and ends at ~T+45 s. The brightest peak occurs at ~T+2 s. T90 (15-350 keV) is 40.14 +- 1.40 sec (estimated error including systematics).
  The time-averaged spectrum from T-21.30 to T+44.47 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.41 +- 0.03. The fluence in the 15-150 keV band is 1.8 +- 0.03 x 10^-5 erg/cm2. The 1-sec peak photon flux measured from T+1.13 sec in the 15-150 keV band is 20.9 +- 0.7 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/916733/BA/
• GCN Circular #25218
  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 190727B (Swift-BAT detection: Lien et al., GCN Circ. 25176; Fermi-GBM observations: Veres and Meegan, GCN Circ. 25180; Fermi-LAT detection: Kovacevic et al., GCN Circ. 25186) triggered Konus-Wind at T0=73072.783 s UT (20:17:52.783).
  The burst light curve shows a multi-peaked structure which starts at ~T0-3.8 s and has a total duration of ~62 s. The emission is seen up to ~6 MeV.
  The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB190727_T73072/
  As observed by Konus-Wind, the burst had a fluence of 9.92(-1.04,+1.04)x10^-5 erg/cm2, and a 64-ms peak flux, measured from T0+21.040 s, of 1.82(-0.34,+0.33)x10^-5 erg/cm2/s (both in the 20 keV - 10 MeV energy range).
  The time-averaged spectrum of the burst (measured from T0 to T0+44.800 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 = -1.11(-0.07,+0.07), the high energy photon index beta = -2.27(-0.29,+0.16), the peak energy Ep = 402(-49,+64) keV (chi2 = 106/97 dof).
  The spectrum near the maximum count rate (measured from T0+16.640 to T0+21.504 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 = -1.07(-0.08,+0.09), the high energy photon index beta = -2.38(-0.85,+0.24), the peak energy Ep = 566(-98,+136) keV (chi2 = 94/97 dof).
  All the quoted errors are at the 90% confidence level. All the quoted values are preliminary.