Gamma-ray Burst 190220B

(All information courtesy of the instrument teams.)

Previous IAU Circulars

none

Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:          GCN/INTEGRAL NOTICE
NOTICE_DATE:    Wed 20 Feb 19 20:15:48 UT
NOTICE_TYPE:    INTEGRAL Wakeup
TRIGGER_NUM:    8226,   Sub_Num: 1
GRB_RA:         242.4824d {+16h 09m 56s} (J2000),
                242.7642d {+16h 11m 03s} (current),
                241.7470d {+16h 06m 59s} (1950)
GRB_DEC:        -21.1497d {-21d 08' 58"} (J2000),
                -21.1987d {-21d 11' 54"} (current),
                -21.0195d {-21d 01' 09"} (1950)
GRB_ERROR:      3.03 [arcmin, radius, statistical only]
GRB_INTEN:      10.11 [sigma]
GRB_TIME:       72943.63 SOD {20:15:43.63} UT
GRB_DATE:       18534 TJD;    51 DOY;   19/02/20
SC_RA:          240.50 [deg] (J2000)
SC_DEC:         -10.42 [deg] (J2000)
SUN_POSTN:      333.90d {+22h 15m 36s}  -10.80d {-10d 47' 49"}
SUN_DIST:        87.16 [deg]   Sun_angle= 6.1 [hr] (West of Sun)
MOON_POSTN:     171.31d {+11h 25m 14s}   +8.18d {+08d 10' 34"}
MOON_DIST:       75.99 [deg]
GAL_COORDS:     352.91, 21.91 [deg] galactic lon,lat of the burst
ECL_COORDS:     244.48, -0.12 [deg] ecliptic lon,lat of the burst
COMMENTS:       INTEGRAL GRB Coordinates.  
COMMENTS:       Time_Scale=20.0000 and Time_Error=20.0000.  
COMMENTS:       Possibly real GRB event  
COMMENTS:          
COMMENTS:       NOTE: This INTEGRAL event is temporally(12.0<100sec) coincident with the FERMI_GBM event (trignum=572386536).

red DSS finding chart ps-file

GCN NOTICE

TITLE:          GCN/INTEGRAL NOTICE
NOTICE_DATE:    Wed 20 Feb 19 20:18:47 UT
NOTICE_TYPE:    INTEGRAL Refined
TRIGGER_NUM:    8226,   Sub_Num: 2
GRB_RA:         242.4734d {+16h 09m 54s} (J2000),
                242.7552d {+16h 11m 01s} (current),
                241.7381d {+16h 06m 57s} (1950)
GRB_DEC:        -21.1359d {-21d 08' 08"} (J2000),
                -21.1849d {-21d 11' 05"} (current),
                -21.0056d {-21d 00' 19"} (1950)
GRB_ERROR:      2.77 [arcmin, radius, statistical only]
GRB_INTEN:      14.59 [sigma]
GRB_TIME:       72984.63 SOD {20:16:24.63} UT
GRB_DATE:       18534 TJD;    51 DOY;   19/02/20
SC_RA:          240.50 [deg] (J2000)
SC_DEC:         -10.42 [deg] (J2000)
SUN_POSTN:      333.90d {+22h 15m 36s}  -10.80d {-10d 47' 46"}
SUN_DIST:        87.17 [deg]   Sun_angle= 6.1 [hr] (West of Sun)
MOON_POSTN:     171.34d {+11h 25m 22s}   +8.17d {+08d 09' 56"}
MOON_DIST:       75.95 [deg]
GAL_COORDS:     352.92, 21.93 [deg] galactic lon,lat of the burst
ECL_COORDS:     244.46, -0.10 [deg] ecliptic lon,lat of the burst
COMMENTS:       INTEGRAL GRB Coordinates.  
COMMENTS:       Time_Scale=100.0000 and Time_Error=100.0000.  
COMMENTS:       Possibly real GRB event  
COMMENTS:          
COMMENTS:       NOTE: This INTEGRAL event is temporally(53.0<100sec) coincident with the FERMI_GBM event (trignum=572386536).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Wed 20 Feb 19 20:15:56 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      47
TRIGGER_NUM:     572386536
GRB_RA:          235.083d {+15h 40m 20s} (J2000),
                 235.355d {+15h 41m 25s} (current),
                 234.375d {+15h 37m 30s} (1950)
GRB_DEC:         -16.750d {-16d 45' 00"} (J2000),
                 -16.811d {-16d 48' 38"} (current),
                 -16.589d {-16d 35' 20"} (1950)
GRB_ERROR:       27.33 [deg radius, statistical plus systematic]
GRB_INTEN:       54 [cnts/sec]
DATA_SIGNIF:     5.40 [sigma]
INTEG_TIME:      4.096 [sec]
GRB_DATE:        18534 TJD;    51 DOY;   19/02/20
GRB_TIME:        72931.49 SOD {20:15:31.49} UT
GRB_PHI:          48.00 [deg]
GRB_THETA:        25.00 [deg]
DATA_TIME_SCALE: 4.0960 [sec]
HARD_RATIO:      1.58
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      70%  GRB
2nd_MOST_LIKELY:  14%  SGR_1806n20
DETECTORS:       1,1,0, 0,0,0, 0,0,0, 0,0,0, 0,0,
SUN_POSTN:       333.90d {+22h 15m 36s}  -10.80d {-10d 47' 49"}
SUN_DIST:         94.91 [deg]   Sun_angle= 6.6 [hr] (West of Sun)
MOON_POSTN:      171.31d {+11h 25m 15s}   +8.18d {+08d 10' 32"}
MOON_DIST:        68.06 [deg]
MOON_ILLUM:      98 [%]
GAL_COORDS:      350.91, 29.98 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      236.72,  2.75 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn190220844/quicklook/glg_lc_medres34_bn190220844.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 102.40,20.35 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(12.0<100sec) coincident with the INTEGRAL event (trignum=8226).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Wed 20 Feb 19 20:16:09 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      57
TRIGGER_NUM:     572386536
GRB_RA:          237.160d {+15h 48m 38s} (J2000),
                 237.445d {+15h 49m 47s} (current),
                 236.416d {+15h 45m 40s} (1950)
GRB_DEC:         -24.000d {-24d 00' 00"} (J2000),
                 -24.058d {-24d 03' 26"} (current),
                 -23.848d {-23d 50' 50"} (1950)
GRB_ERROR:       13.13 [deg radius, statistical only]
DATA_SIGNIF:     5.70 [sigma]
DATA_INTERVAL:   4.096 [sec]
GRB_DATE:        18534 TJD;    51 DOY;   19/02/20
GRB_TIME:        72931.49 SOD {20:15:31.49} UT
GRB_PHI:          30.00 [deg]
GRB_THETA:        24.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   4153 (Gnd S/W Version number)
SUN_POSTN:       333.90d {+22h 15m 36s}  -10.80d {-10d 47' 49"}
SUN_DIST:         91.40 [deg]   Sun_angle= 6.4 [hr] (West of Sun)
MOON_POSTN:      171.31d {+11h 25m 15s}   +8.17d {+08d 10' 30"}
MOON_DIST:        72.08 [deg]
MOON_ILLUM:      98 [%]
GAL_COORDS:      346.96, 23.35 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      240.23, -3.89 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn190220844/quicklook/glg_lc_medres34_bn190220844.gif
POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_572386536.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(12.0<100sec) coincident with the INTEGRAL event (trignum=8226).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Wed 20 Feb 19 20:17:20 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      0
TRIGGER_NUM:     572386536
GRB_RA:          266.720d {+17h 46m 53s} (J2000),
                 267.012d {+17h 48m 03s} (current),
                 265.957d {+17h 43m 50s} (1950)
GRB_DEC:         -23.820d {-23d 49' 11"} (J2000),
                 -23.826d {-23d 49' 32"} (current),
                 -23.802d {-23d 48' 07"} (1950)
GRB_ERROR:       12.13 [deg radius, statistical only]
DATA_SIGNIF:     9.10 [sigma]
DATA_INTERVAL:   17.408 [sec]
GRB_DATE:        18534 TJD;    51 DOY;   19/02/20
GRB_TIME:        72931.49 SOD {20:15:31.49} UT
GRB_PHI:          18.00 [deg]
GRB_THETA:        50.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   41531 (Gnd S/W Version number)
SUN_POSTN:       333.90d {+22h 15m 36s}  -10.80d {-10d 47' 47"}
SUN_DIST:         64.63 [deg]   Sun_angle= 4.5 [hr] (West of Sun)
MOON_POSTN:      171.33d {+11h 25m 18s}   +8.17d {+08d 10' 14"}
MOON_DIST:        98.46 [deg]
MOON_ILLUM:      98 [%]
GAL_COORDS:        4.52,  2.42 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      267.00, -0.41 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn190220844/quicklook/glg_lc_medres34_bn190220844.gif
POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_572386536.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(64.0<100sec) coincident with the INTEGRAL_SPIACS event (trignum=8226).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Wed 20 Feb 19 20:24:49 UT
NOTICE_TYPE:     Fermi-GBM Final Position
RECORD_NUM:      0
TRIGGER_NUM:     572386536
GRB_RA:          252.670d {+16h 50m 41s} (J2000),
                 253.040d {+16h 52m 10s} (current),
                 251.704d {+16h 46m 49s} (1950)
GRB_DEC:         -50.860d {-50d 51' 35"} (J2000),
                 -50.891d {-50d 53' 28"} (current),
                 -50.775d {-50d 46' 28"} (1950)
GRB_ERROR:       16.86 [deg radius, statistical only]
GRB_DATE:        18534 TJD;    51 DOY;   19/02/20
GRB_TIME:        72931.49 SOD {20:15:31.49} UT
GRB_PHI:         339.00 [deg]
GRB_THETA:        39.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   41531 (Gnd S/W Version number)
SUN_POSTN:       333.91d {+22h 15m 37s}  -10.79d {-10d 47' 41"}
SUN_DIST:         75.89 [deg]   Sun_angle= 5.4 [hr] (West of Sun)
MOON_POSTN:      171.40d {+11h 25m 36s}   +8.14d {+08d 08' 38"}
MOON_DIST:        91.10 [deg]
MOON_ILLUM:      98 [%]
GAL_COORDS:      336.09, -4.08 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      257.69,-28.16 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn190220844/quicklook/glg_lc_medres34_bn190220844.gif
LOC_URL:         http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2019/bn190220844/quicklook/glg_locplot_all_bn190220844.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(64.0<100sec) coincident with the INTEGRAL_SPIACS event (trignum=8226).

GCN NOTICE

TITLE:          GCN/INTEGRAL NOTICE
NOTICE_DATE:    Wed 20 Feb 19 20:17:05 UT 
NOTICE_TYPE:    INTEGRAL SPI ACS Trigger
TRIGGER_NUM:    8226,   Sub_Num: 0
GRB_INTEN:      10.32 [sigma]
GRB_TIME:       72995.73 SOD {20:16:35.73} UT
GRB_DATE:       18534 TJD;    51 DOY;   19/02/20
COMMENTS:       INTEGRAL SPI_ACS GRB Trigger.
COMMENTS:       Time_Scale=0.0500 and Time_Error=0.0250.
COMMENTS:
COMMENTS:       NOTE: This SPIACS event is temporally(64.0<100sec) coincident with the FERMI_GBM event (trignum=572386536).
COMMENTS:
COMMENTS:       The SPIACS lightcurve can be found at:
COMMENTS:       ftp://isdcarc.unige.ch/arc/FTP/ibas/spiacs/2019-02/2019-02-20T20-16-35.5414-06139-27536-0.lc

GCN NOTICE

TITLE:          GCN/INTEGRAL NOTICE
NOTICE_DATE:    Wed 20 Feb 19 21:49:08 UT
NOTICE_TYPE:    INTEGRAL Offline
TRIGGER_NUM:    8226,   Sub_Num: 3
GRB_RA:         242.4512d {+16h 09m 48s} (J2000),
                242.7330d {+16h 10m 56s} (current),
                241.7159d {+16h 06m 52s} (1950)
GRB_DEC:        -21.1313d {-21d 07' 52"} (J2000),
                -21.1804d {-21d 10' 48"} (current),
                -21.0010d {-21d 00' 03"} (1950)
GRB_ERROR:      2.00 [arcmin, radius, statistical only]
GRB_INTEN:      14.59 [sigma]
GRB_TIME:       72984.63 SOD {20:16:24.63} UT
GRB_DATE:       18534 TJD;    51 DOY;   19/02/20
SC_RA:          240.50 [deg] (J2000)
SC_DEC:         -10.42 [deg] (J2000)
SUN_POSTN:      333.96d {+22h 15m 51s}  -10.77d {-10d 46' 25"}
SUN_DIST:        87.25 [deg]   Sun_angle= 6.1 [hr] (West of Sun)
MOON_POSTN:     172.23d {+11h 28m 56s}   +7.84d {+07d 50' 24"}
MOON_DIST:       74.99 [deg]
GAL_COORDS:     352.90, 21.95 [deg] galactic lon,lat of the burst
ECL_COORDS:     244.44, -0.10 [deg] ecliptic lon,lat of the burst
COMMENTS:       INTEGRAL GRB Coordinates.  
COMMENTS:       Time_Scale=100.0000 and Time_Error=100.0000.  
COMMENTS:       CONFIRMATION_GRB  
COMMENTS:          
COMMENTS:       NOTE: This INTEGRAL event is temporally(53.0<100sec) coincident with the FERMI_GBM event (trignum=572386536).

GCN Circular #23915
D.Gotz (CEA, Saclay), S.Mereghetti (INAF, IASF-Milano), C.Ferrigno, E.Bozzo, V.Savchenko (ISDC, Versoix), L.Ducci (IAAT, Germany and ISDC, Versoix) and J.Borkowski (CAMK, Torun) report:
a gamma ray burst lasting about 200 s with a multi-peaked structure has been detected by IBAS in the IBIS/ISGRI data at 20:12:43 UT of February 20, 2019.
The refined coordinates (J2000) are:
```
R.A.= 242.4512 deg
DEC.= -21.1314 deg
```
with an uncertainty of 2.0 arcmin (90% c.l.).
The burst had a peak flux of 0.2 counts/cm2/s (20-200 keV, 1-s integration time) and a fluence in the same energy range of about 3.6e-6 erg/cmsq.
A plot of the light curve will be posted at http://ibas.iasf-milano.inaf.it/IBAS_Results.html
GCN Circular #23916
Y.-D. Hu, X.-Y.Li, E. Fernandez-Garcia, A. Ayala, A. J. Castro-Tirado (IAA-CSIC), C. Perez del Pulgar, A. Castellon, I. Carrasco (Univ. de Malaga), S. Guziy (Univ. of Nikolaev) and D. Xiong, Y. Fan, X. Zhao, J. Bai, C. Wang, Y. Xin (Yunnan Nacional Astronomical Observatory) on behalf of a larger collaboration, report:
"Following the detection of GRB 190220B by INTEGRAL (Gotz et al. GCNC 23915), the 0.6m BOOTES-4/MET robotic telescope at Lijiang Astronomical Observatory (China) responded to the the burst gathering images starting at 20:17:12 UT (89 s after trigger, 84 s after notice). No optical afterglow candidate is found down to 18 mag (g'-band) in the co-added (5x10s) image within the reported INTEGRAL 2 arcmin radius error box. Observations are ongoing."
GCN Circular #23919
S. Belkin (IKI), A. Novichonok (KIAM), A. Pozanenko (IKI), E. Mazaeva (IKI), A. Volnova (IKI), I. Molotov (KIAM) report on behalf of larger GRB follow-up collaboration:
We observed the field of INTEGRAL GRB 190220B (Gotz et al., GCN 23915) with RC-36 0.36-m telescope of Kitab Observatory starting on Feb. 20 (UT) 23:20:25 in Clear filter. We do not find any optical afterglow candidate in the INTEGRAL GRB 190220B localization error circle (Gotz, et al., GCN 23915) with is in agreement with earlier non detection by BOOTES-4 (Hu et al., GCN 23916). Preliminary photometry of the field is following.
```
Date       UT start   t-T0       Filter Exp.    OT     Err.   UL(3sigma)
                       (mid, days)        (s)

2019-02-20 23:20:25   0.14972    CR     48*60   19.0   n/d    n/d
```
The photometry is based on the nearby USNO-B1 (R2) stars. .
GCN Circular #23921
C. Fletcher (USRA) and C. Meegan (UAH) report on behalf of the Fermi GBM Team:
"At 20:15:31.49 UT on 20 February 2019, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 190220B (trigger 572386536 / 190220844).
which was also detected by INTEGRAL (Gotz et al. 2019, GCN 23915). The GBM on-ground location is consistent with the INTEGRAL position.
The angle from the Fermi LAT boresight at the GBM trigger time is 23 degrees.
The GBM light curve consists of multiple peaks with a duration (T90) of about 109 s (50-300 keV). The time-averaged spectrum from T0-51.201 s to T0+59.393 s is well fit by a power law function with an exponential high-energy cutoff. The power law index is -1.4 +/- 0.1 and the cutoff energy, parameterized as Epeak, is 83 +/- 8 keV
The event fluence (10-1000 keV) in this time interval is (7.2 +/- 0.6)E-06 erg/cm^2. The 1-sec peak photon flux measured starting from T0+38.72 s in the 10-1000 keV band is 2.5 +/- 0.2 ph/s/cm^2.
A Band function fits the spectrum equally well with Epeak= 73 +/- 13 keV, alpha = -1.3 +/- 0.2 and beta = -2.5 +/- 0.4.
The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog."

Back to JG's homepage

Jochen Greiner, last update: 21-Feb-2019 [Disclaimer]