Gamma-ray Burst 200205B

(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 05 Feb 20 19:26:21 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     954519,   Seg_Num: 0
GRB_RA:          107.803d {+07h 11m 13s} (J2000),
                 107.899d {+07h 11m 36s} (current),
                 107.562d {+07h 10m 15s} (1950)
GRB_DEC:         -56.481d {-56d 28' 49"} (J2000),
                 -56.515d {-56d 30' 53"} (current),
                 -56.396d {-56d 23' 45"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       0 [cnts]    Image_Peak=5388 [image_cnts]
TRIGGER_DUR:     264.000 [sec]   (=4.4 [min])
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:        18884 TJD;    36 DOY;   20/02/05
GRB_TIME:        69703.61 SOD {19:21:43.61} UT
GRB_PHI:          15.53 [deg]
GRB_THETA:        39.08 [deg]
SOLN_STATUS:     0x13
RATE_SIGNIF:     0.00 [sigma]
IMAGE_SIGNIF:    11.12 [sigma]
MERIT_PARAMS:     +1  +0  +0  +1  +1  +1  +0  +0 +22  +0 
SUN_POSTN:       318.91d {+21h 15m 39s}  -15.90d {-15d 54' 09"}
SUN_DIST:        103.08 [deg]   Sun_angle= -9.9 [hr] (East of Sun)
MOON_POSTN:       90.30d {+06h 01m 11s}  +22.79d {+22d 47' 32"}
MOON_DIST:        80.69 [deg]
MOON_ILLUM:      85 [%]
GAL_COORDS:      267.16,-19.74 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      138.24,-76.92 [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 = 87.73,-20.05 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 05 Feb 20 19:27:59 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     954519,   Seg_Num: 0
GRB_RA:          107.7862d {+07h 11m 08.68s} (J2000),
                 107.8828d {+07h 11m 31.86s} (current),
                 107.5456d {+07h 10m 10.95s} (1950)
GRB_DEC:         -56.4882d {-56d 29' 17.5"} (J2000),
                 -56.5225d {-56d 31' 20.8"} (current),
                 -56.4037d {-56d 24' 13.3"} (1950)
GRB_ERROR:       5.4 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.26e-09 [erg/cm2/sec]
GRB_SIGNIF:      7.21 [sigma]
IMG_START_DATE:  18884 TJD;    36 DOY;   20/02/05
IMG_START_TIME:  70046.31 SOD {19:27:26.31} UT,   342.7 [sec] since BAT Trigger Time
TAM[0-3]:        327.65 237.16 261.71 243.81
AMPLIFIER:       2
WAVEFORM:        134
SUN_POSTN:       318.91d {+21h 15m 39s}  -15.90d {-15d 54' 08"}
SUN_DIST:        103.06 [deg]   Sun_angle= -9.9 [hr] (East of Sun)
MOON_POSTN:       90.31d {+06h 01m 15s}  +22.79d {+22d 47' 37"}
MOON_DIST:        80.70 [deg]
MOON_ILLUM:      85 [%]
GAL_COORDS:      267.17,-19.75 [deg] galactic lon,lat of the burst
ECL_COORDS:      138.22,-76.93 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        The XRT position is 0.71 arcmin from the BAT position.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 05 Feb 20 19:28:09 UT
NOTICE_TYPE:     Swift-XRT Image
TRIGGER_NUM:     954519,   Seg_Num: 0
GRB_RA:          107.7862d {+07h 11m 08.6s} (J2000),
                 107.8828d {+07h 11m 31.8s} (current),
                 107.5456d {+07h 10m 10.9s} (1950)
GRB_DEC:         -56.4882d {-56d 29' 17.5"} (J2000),
                 -56.5225d {-56d 31' 20.8"} (current),
                 -56.4037d {-56d 24' 13.3"} (1950)
GRB_ERROR:       5.4 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       52 [cnts]
IMG_START_DATE:  18884 TJD;    36 DOY;   20/02/05
IMG_START_TIME:  70046.31 SOD {19:27:26.31} UT,   342.7 [sec] since BAT Trigger Time
CENTROID_X:      306.57,  raw= 307  [pixels]
CENTROID_Y:      279.56,  raw= 280  [pixels]
ROLL:            210.71 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   -43.68
GRB_POS_XRT_Z:   -1.93
IMAGE_URL:       sw00954519000msxps_rw.img
SUN_POSTN:       318.91d {+21h 15m 39s}  -15.90d {-15d 54' 07"}
SUN_DIST:        103.06 [deg]   Sun_angle= -9.9 [hr] (East of Sun)
MOON_POSTN:       90.32d {+06h 01m 16s}  +22.79d {+22d 47' 38"}
MOON_DIST:        80.70 [deg]
MOON_ILLUM:      85 [%]
GAL_COORDS:      267.17,-19.75 [deg] galactic lon,lat of the burst
ECL_COORDS:      138.22,-76.93 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 05 Feb 20 19:28:11 UT
NOTICE_TYPE:     Swift-XRT Processed Image
TRIGGER_NUM:     954519,   Seg_Num: 0
GRB_RA:          107.7862d {+07h 11m 08.6s} (J2000),
                 107.8828d {+07h 11m 31.8s} (current),
                 107.5456d {+07h 10m 10.9s} (1950)
GRB_DEC:         -56.4882d {-56d 29' 17.5"} (J2000),
                 -56.5225d {-56d 31' 20.8"} (current),
                 -56.4037d {-56d 24' 13.3"} (1950)
GRB_ERROR:       5.4 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       52 [cnts]
IMG_START_DATE:  18884 TJD;    36 DOY;   20/02/05
IMG_START_TIME:  70046.31 SOD {19:27:26.31} UT,   342.7 [sec] since BAT Trigger Time
CENTROID_X:      306.57,  raw= 307  [pixels]
CENTROID_Y:      279.56,  raw= 280  [pixels]
ROLL:            210.71 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   -43.68
GRB_POS_XRT_Z:   -1.93
IMAGE_URL:       sw00954519000msxps_rw.img
SUN_POSTN:       318.91d {+21h 15m 39s}  -15.90d {-15d 54' 07"}
SUN_DIST:        103.06 [deg]   Sun_angle= -9.9 [hr] (East of Sun)
MOON_POSTN:       90.32d {+06h 01m 16s}  +22.79d {+22d 47' 38"}
MOON_DIST:        80.70 [deg]
MOON_ILLUM:      85 [%]
GAL_COORDS:      267.17,-19.75 [deg] galactic lon,lat of the burst
ECL_COORDS:      138.22,-76.93 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Processed Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 05 Feb 20 19:30:26 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     954519,   Seg_Num: 0
POINT_RA:        107.806d {+07h 11m 13s} (J2000)
POINT_DEC:       -56.494d {-56d 29' 37"} (J2000)
POINT_ROLL:      210.706d
IMG_START_DATE:  18884 TJD;    36 DOY;   20/02/05
IMG_START_TIME:  70054.97 SOD {19:27:34.97} UT,   86351.4 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.662
N_STARS:         101
X_OFFSET:        448 [pixels]
Y_OFFSET:        656 [pixels]
X_MAX:           1407 [pixels]
Y_MAX:           1615 [pixels]
DET_THRESH:      11
PHOTO_THRESH:    5
SL_URL:          sw00954519000msufc-048.fits
SUN_POSTN:       318.91d {+21h 15m 39s}  -15.90d {-15d 54' 06"}
SUN_DIST:        103.06 [deg]   Sun_angle= -9.9 [hr] (East of Sun)
MOON_POSTN:       90.34d {+06h 01m 21s}  +22.80d {+22d 47' 44"}
MOON_DIST:        80.70 [deg]
MOON_ILLUM:      85 [%]
GAL_COORDS:      267.18,-19.75 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      138.27,-76.93 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 05 Feb 20 19:30:42 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     954519,   Seg_Num: 0
POINT_RA:        107.806d {+07h 11m 13s} (J2000)
POINT_DEC:       -56.494d {-56d 29' 37"} (J2000)
POINT_ROLL:      210.706d
IMG_START_DATE:  18884 TJD;    36 DOY;   20/02/05
IMG_START_TIME:  70054.97 SOD {19:27:34.97} UT,   86351.4 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.662
N_STARS:         101
X_OFFSET:        448 [pixels]
Y_OFFSET:        656 [pixels]
X_MAX:           1407 [pixels]
Y_MAX:           1615 [pixels]
DET_THRESH:      11
PHOTO_THRESH:    5
SL_URL:          sw00954519000msufc-048.fits
SUN_POSTN:       318.91d {+21h 15m 39s}  -15.90d {-15d 54' 06"}
SUN_DIST:        103.06 [deg]   Sun_angle= -9.9 [hr] (East of Sun)
MOON_POSTN:       90.34d {+06h 01m 22s}  +22.80d {+22d 47' 45"}
MOON_DIST:        80.70 [deg]
MOON_ILLUM:      85 [%]
GAL_COORDS:      267.18,-19.75 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      138.27,-76.93 [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 05 Feb 20 19:32:39 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     954519,   Seg_Num: 0
POINT_RA:        107.806d {+07h 11m 13s} (J2000)
POINT_DEC:       -56.494d {-56d 29' 37"} (J2000)
ROLL:            210.706d
IMG_START_DATE:  18884 TJD;    36 DOY;   20/02/05
IMG_START_TIME:  70054.97 SOD {19:27:34.97} UT,   86351.4 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     602623679
X_OFFSET:        848 [pixels]
Y_OFFSET:        965 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1008
Y_GRB_POS:       1125
BINNING_INDEX:   1
IM_URL:          sw00954519000msuni-023.fits
SUN_POSTN:       318.92d {+21h 15m 40s}  -15.90d {-15d 54' 04"}
SUN_DIST:        103.06 [deg]   Sun_angle= -9.9 [hr] (East of Sun)
MOON_POSTN:       90.36d {+06h 01m 27s}  +22.80d {+22d 47' 51"}
MOON_DIST:        80.70 [deg]
MOON_ILLUM:      85 [%]
GAL_COORDS:      267.18,-19.75 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      138.27,-76.93 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Image.  
COMMENTS:        The GRB Position came from the XRT Position Command.  
COMMENTS:        The image has 2x2 binning (compression).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 05 Feb 20 19:32:56 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     954519,   Seg_Num: 0
POINT_RA:        107.806d {+07h 11m 13s} (J2000)
POINT_DEC:       -56.494d {-56d 29' 37"} (J2000)
ROLL:            210.706d
IMG_START_DATE:  18884 TJD;    36 DOY;   20/02/05
IMG_START_TIME:  70054.97 SOD {19:27:34.97} UT,   86351.4 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     602623679
X_OFFSET:        848 [pixels]
Y_OFFSET:        965 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1008
Y_GRB_POS:       1125
BINNING_INDEX:   1
IM_URL:          sw00954519000msuni-023.fits
SUN_POSTN:       318.92d {+21h 15m 40s}  -15.90d {-15d 54' 04"}
SUN_DIST:        103.06 [deg]   Sun_angle= -9.9 [hr] (East of Sun)
MOON_POSTN:       90.36d {+06h 01m 27s}  +22.80d {+22d 47' 52"}
MOON_DIST:        80.70 [deg]
MOON_ILLUM:      85 [%]
GAL_COORDS:      267.18,-19.75 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      138.27,-76.93 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        The GRB Position came from the XRT Position Command.  
COMMENTS:        The image has 2x2 binning (compression).  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 05 Feb 20 19:34:29 UT
NOTICE_TYPE:     Swift-UVOT Position
TRIGGER_NUM:     954519,   Seg_Num: 0
GRB_RA:          107.7881d {+07h 11m 09.14s} (J2000),
                 107.8847d {+07h 11m 32.31s} (current),
                 107.5475d {+07h 10m 11.40s} (1950)
GRB_DEC:         -56.4875d {-56d 29' 14.9"} (J2000),
                 -56.5218d {-56d 31' 18.3"} (current),
                 -56.4030d {-56d 24' 10.8"} (1950)
GRB_ERROR:       0.6 [arcsec radius, statistical only]
GRB_MAG:         16.43 +/- 0.14 [mag]
FILTER:          10, White
IMG_START_DATE:  18884 TJD;    36 DOY;   20/02/05
IMG_START_TIME:  70051.00 SOD {19:27:31.00} UT,   86347.4 [sec] since BAT Trigger Time
SUN_POSTN:       318.92d {+21h 15m 40s}  -15.90d {-15d 54' 03"}
SUN_DIST:        103.07 [deg]   Sun_angle= -9.9 [hr] (East of Sun)
MOON_POSTN:       90.38d {+06h 01m 31s}  +22.80d {+22d 47' 56"}
MOON_DIST:        80.69 [deg]
MOON_ILLUM:      85 [%]
GAL_COORDS:      267.17,-19.75 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      138.22,-76.93 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT UVOT Position Notice.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        The UVOT position is 4.3 arcsec from the XRT position.  
COMMENTS:        Result based on Genie data.  
COMMENTS:        Notice generated automatically.

GCN Circular #26991
D. Buckley, S. Potter, A. Kniazev, M. Kotze South African Astronomical Observatory
V. Lipunov, E. Gorbovskoy, V.Kornilov, D.Kuvshinov, N.Tyurina, P.Balanutsa, A.Kuznetsov, D. Vlasenko, F. Balakin Lomonosov Moscow State University, Sternberg Astronomical Institute, Moscow State University
K. Ivanov, O. Gres, N.M. Budnev, S. Yazev, O. Chuvalaev, V. Poleshchuk Irkutsk State University
A. Tlatov, V.Senik, A.V. Parhomenko, D. Dormidontov Kislovodsk Solar Station of the Pulkovo Observatory
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 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
MASTER-SAAO robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in South Africa (South African Astronomical Observatory) was pointed to the GRB200205.81 21 sec after notice time and 300 sec after trigger time at 2020-02-05 19:26:44 UT. On our first (60s exposure) set we found 1 optical transient within Swift error-box (ra=107.8 dec=-56.4808 r=0.05) brighter than 15.7.
```
 T-Tmid      Date      Time       Expt.        Ra                Dec           Mag
---------|---------------------|-------|-----------------|-----------------|-------
     330   2020-02-05 19:26:44      60   (07h 11m 09.07s , -56d 29m 14.6s)     16.3
```
The 5-sigma upper limit has been about 15.7mag The message may be cited.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 05 Feb 20 19:41:48 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     954519,   Seg_Num: 0
POINT_RA:        107.809d {+07h 11m 14s} (J2000)
POINT_DEC:       -56.495d {-56d 29' 42"} (J2000)
POINT_ROLL:      210.703d
IMG_START_DATE:  18884 TJD;    36 DOY;   20/02/05
IMG_START_TIME:  70564.69 SOD {19:36:04.69} UT,   461.1 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.667
N_STARS:         190
X_OFFSET:        288 [pixels]
Y_OFFSET:        405 [pixels]
X_MAX:           1727 [pixels]
Y_MAX:           1844 [pixels]
DET_THRESH:      11
PHOTO_THRESH:    5
SL_URL:          sw00954519000msufc0461.fits
SUN_POSTN:       318.92d {+21h 15m 41s}  -15.90d {-15d 53' 57"}
SUN_DIST:        103.06 [deg]   Sun_angle= -9.9 [hr] (East of Sun)
MOON_POSTN:       90.45d {+06h 01m 49s}  +22.80d {+22d 48' 18"}
MOON_DIST:        80.70 [deg]
MOON_ILLUM:      85 [%]
GAL_COORDS:      267.18,-19.74 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      138.28,-76.93 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 05 Feb 20 19:42:06 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     954519,   Seg_Num: 0
POINT_RA:        107.809d {+07h 11m 14s} (J2000)
POINT_DEC:       -56.495d {-56d 29' 42"} (J2000)
POINT_ROLL:      210.703d
IMG_START_DATE:  18884 TJD;    36 DOY;   20/02/05
IMG_START_TIME:  70564.69 SOD {19:36:04.69} UT,   461.1 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.667
N_STARS:         190
X_OFFSET:        288 [pixels]
Y_OFFSET:        405 [pixels]
X_MAX:           1727 [pixels]
Y_MAX:           1844 [pixels]
DET_THRESH:      11
PHOTO_THRESH:    5
SL_URL:          sw00954519000msufc0461.fits
SUN_POSTN:       318.92d {+21h 15m 41s}  -15.90d {-15d 53' 57"}
SUN_DIST:        103.06 [deg]   Sun_angle= -9.9 [hr] (East of Sun)
MOON_POSTN:       90.46d {+06h 01m 50s}  +22.81d {+22d 48' 19"}
MOON_DIST:        80.70 [deg]
MOON_ILLUM:      85 [%]
GAL_COORDS:      267.18,-19.74 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      138.28,-76.93 [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 05 Feb 20 19:43:09 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     954519,   Seg_Num: 0
POINT_RA:        107.809d {+07h 11m 14s} (J2000)
POINT_DEC:       -56.495d {-56d 29' 42"} (J2000)
ROLL:            210.703d
IMG_START_DATE:  18884 TJD;    36 DOY;   20/02/05
IMG_START_TIME:  70564.69 SOD {19:36:04.69} UT,   461.1 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     602624189
X_OFFSET:        847 [pixels]
Y_OFFSET:        964 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1007
Y_GRB_POS:       1124
BINNING_INDEX:   1
IM_URL:          sw00954519000msuni0486.fits
SUN_POSTN:       318.92d {+21h 15m 41s}  -15.90d {-15d 53' 56"}
SUN_DIST:        103.06 [deg]   Sun_angle= -9.9 [hr] (East of Sun)
MOON_POSTN:       90.47d {+06h 01m 52s}  +22.81d {+22d 48' 22"}
MOON_DIST:        80.69 [deg]
MOON_ILLUM:      85 [%]
GAL_COORDS:      267.18,-19.74 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      138.28,-76.93 [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 05 Feb 20 19:42:23 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     954519,   Seg_Num: 0
GRB_RA:          107.7878d {+07h 11m 09.07s} (J2000),
                 107.8844d {+07h 11m 32.24s} (current),
                 107.5472d {+07h 10m 11.33s} (1950)
GRB_DEC:         -56.4874d {-56d 29' 14.6"} (J2000),
                 -56.5217d {-56d 31' 18.0"} (current),
                 -56.4029d {-56d 24' 10.4"} (1950)
GRB_ERROR:       3.1 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  18884 TJD;    36 DOY;   20/02/05
IMG_START_TIME:  70414.00 SOD {19:33:34.00} UT,   310.4 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       318.92d {+21h 15m 41s}  -15.90d {-15d 53' 57"}
SUN_DIST:        103.07 [deg]   Sun_angle= -9.9 [hr] (East of Sun)
MOON_POSTN:       90.46d {+06h 01m 50s}  +22.81d {+22d 48' 19"}
MOON_DIST:        80.68 [deg]
MOON_ILLUM:      85 [%]
GAL_COORDS:      267.17,-19.75 [deg] galactic lon,lat of the burst
ECL_COORDS:      138.22,-76.93 [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 NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 05 Feb 20 19:43:24 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     954519,   Seg_Num: 0
POINT_RA:        107.809d {+07h 11m 14s} (J2000)
POINT_DEC:       -56.495d {-56d 29' 42"} (J2000)
ROLL:            210.703d
IMG_START_DATE:  18884 TJD;    36 DOY;   20/02/05
IMG_START_TIME:  70564.69 SOD {19:36:04.69} UT,   461.1 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     602624189
X_OFFSET:        847 [pixels]
Y_OFFSET:        964 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1007
Y_GRB_POS:       1124
BINNING_INDEX:   1
IM_URL:          sw00954519000msuni0486.fits
SUN_POSTN:       318.92d {+21h 15m 41s}  -15.90d {-15d 53' 56"}
SUN_DIST:        103.06 [deg]   Sun_angle= -9.9 [hr] (East of Sun)
MOON_POSTN:       90.47d {+06h 01m 53s}  +22.81d {+22d 48' 22"}
MOON_DIST:        80.69 [deg]
MOON_ILLUM:      85 [%]
GAL_COORDS:      267.18,-19.74 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      138.28,-76.93 [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 #26992
V. Lipunov, E. Gorbovskoy, V.Kornilov, N.Tyurina, P.Balanutsa, A.Kuznetsov, F.Balakin, V.Vladimirov, D. Vlasenko, I.Gorbunov, D.Zimnukhov, V.Senik, T.Pogrosheva, D.Kuvshinov, D. Cheryasov (Lomonosov Moscow State University, SAI, Physics Department),
R. Podesta, C.Lopez, F. Podesta, C.Francile (Observatorio Astronomico Felix Aguilar OAFA),
H.Levato (Instituto de Ciencias Astronomicas, de la Tierra y del Espacio ICATE),
R. Rebolo, M. Serra (The Instituto de Astrofisica de Canarias),
D. Buckley (South African Astronomical Observatory),
O.A. Gres, N.M. Budnev, O.Ershova (Irkutsk State University, API),
A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory),
V. Yurkov, A. Gabovich, Yu. Sergienko (Blagoveschensk Educational State University)
MASTER-SAAO robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in South Africa (South African Astronomical Observatory) was pointed to the Swift GRB200205.81 (trigger No 954519,07h 11m 12.72s , -56d 28m 51.6s, R=0.05) errorbox 21 sec after notice time and 300 sec after trigger time at 2020-02-05 19:26:44 UT, with upper limit up to 18.0 mag. The observations began at zenith distance = 28 deg. The sun altitude is -21.2 deg.
The galactic latitude b = -20 deg., longitude l = 267 deg.
Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=1278994
We obtain a following upper limits.
```
Tmid-T0  |          Site       |Filt.| Expt. | Limit| Comment
_________|_____________________|_____|_______|______|________

     331 |         MASTER-SAAO |  P\ |    60 | 16.2 |        
     411 |         MASTER-SAAO |  P\ |   220 | 16.8 |  Coadd 
     419 |         MASTER-SAAO |  P\ |    70 | 16.6 |        
     521 |         MASTER-SAAO |  P\ |    90 | 16.9 |        
     642 |         MASTER-SAAO |  P\ |   110 | 17.5 |        
     797 |         MASTER-SAAO |  P\ |   420 | 18.0 |  Coadd 
     789 |         MASTER-SAAO |  P\ |   140 | 17.5 |        
     966 |         MASTER-SAAO |  P\ |   170 | 17.6 |        
```
The observation and reduction will continue. The message may be cited.
GCN Circular #26993
P. A. Evans (U Leicester), J.D. Gropp (PSU), J. A. Kennea (PSU), N. J. Klingler (PSU), A. Y. Lien (GSFC/UMBC), F. E. Marshall (NASA/GSFC), M. J. Moss (GWU), K. L. Page (U Leicester) and A. Tohuvavohu (U Toronto) report on behalf of the Neil Gehrels Swift Observatory Team:
At 19:21:43 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 200205B (trigger=954519 and 954520). Swift slewed to the burst after a short delay. The BAT on-board calculated location is RA, Dec 107.861, -56.506 which is
```
   RA(J2000) = 07h 11m 27s
   Dec(J2000) = -56d 30' 21"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a peak about 20 seconds long (trigger 954519) followed by a brighter more complex peak structure 350 s later (trigger 954520) with a peak countrate of 3500 counts/s. Due to the double trigger, the complete BAT lightcurve is not immediately available.
The XRT began observing the field at 19:27:26.3 UT, 342.7 seconds after the BAT trigger. Using promptly downlinked data we find a bright, uncatalogued X-ray source with an enhanced position: RA, Dec 107.7881, -56.4875 which is equivalent to:
```
   RA(J2000)  = 07h 11m 09.14s
   Dec(J2000) = -56d 29' 15.0"
```
with an uncertainty of 2.8 arcseconds (radius, 90% containment). This location is 37 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 https://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 consistent with the Galactic value of 1.04 x 10^21 cm^-2 (Willingale et al. 2013).
The initial flux in the 2.5 s image was 1.26e-09 erg cm^-2 s^-1 (0.2-10 keV).
UVOT took a finding chart exposure of 150 seconds with the White filter starting 351 seconds after the BAT trigger. There is a candidate afterglow in the rapidly available 2.7'x2.7' sub-image at
```
  RA(J2000)  =	07:11:09.15 = 107.78811
  DEC(J2000) = -56:29:15.1  = -56.48753
```
with a 90%-confidence error radius of about 0.61 arc sec. This position is 0.8 arc sec. from the center of the XRT error circle. The estimated magnitude is 16.43 with a 1-sigma error of about 0.14. No correction has been made for the expected extinction corresponding to E(B-V) of 0.11.
Burst Advocate for this burst is P. A. Evans (pae9 AT star.le.ac.uk). 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 #26995
R. Strausbaugh (U. of the Virgin Islands), A. Cucchiara (U. of the Virgin Islands/College of Marin) report on behalf of a larger collaboration:
We observed Swift GRB 200205B (Evans et al., GCN 26993) with the LCO 1-m Sinistro instrument at the South African Astronomical Observatory site on February 5, from 19:38 to 20:00 UT (corresponding to 0.28 to 0.82 hours after the GRB trigger time) with the Bessel R and I filters.
We performed a series of 5x120s exposures in each band. We detect a source that is consistent with the Swift-XRT position (Evans et al., GCN 26993) and other optical detections (Lipunov et al., GCN 26991) and not present in either USNO-B1.0 or 2MASS surveys with the following magnitudes:
R = 18.56 +/- 0.04
I = 17.15 +/- 0.03
These magnitudes are calibrated against several USNO-B1.0 objects near the GRB location and is not corrected for Galactic Extinction.
R.S. is funded by NSF AST grant #1831682
GCN Circular #26998
J.-B. Vielfaure (GEPI - Paris Observatory), D. Xu (NAO/CAS), J. Palmerio (GEPI - Paris Observatory), D. B. Malesani (DTU Space), L. Izzo (DARK/NBI), D. A. Kann (HETH/IAA-CSIC), A. J. Levan (Radboud Univ.), G. Pugliese (Univ. Amsterdam), N. R. Tanvir (Univ. Leicester) report on behalf of the Stargate collabaration:
We observed the optical afterglow of GRB 200205B (Evans et al., GCN 26993) using the ESO VLT UT2 (Kueyen) equipped with the X-shooter spectrograph. Our spectra cover the wavelength range 3000-25000 AA, and consist of 4 exposures by 600 s each. The observation mid time was 2020 Feb 6.063 UT (6.16 hr after the GRB).
In a 30 s image taken with the acquisition camera on Feb 6.041 UT, we detect the optical afterglow, for which we measure a magnitude r = 20.34 +- 0.03 AB (calibrated against nearby stars from the SkyMapper catalog; Wolf et al. 2018, PASA, 35, 010; https:doi.org/10.4225/41/593620ad5b574).
We clearly detect continuum over the wavelength range 3100-24000 AA. From detection of multiple absorption features, which we interpret as due to C ii, Si iv, Si ii, C iv, Fe ii, Al ii, Mg ii, we infer a redshift z = 1.465. Emission lines are also detected, which we interpret as due to the [O ii] and [O iii] doublets, Hbeta, and Halpha, all at the above quoted redshift.
We acknowledge excellent support from the ESO observing staff in Paranal, in particular J. Corral-Santana and J. Velasquez.
GCN Circular #26999
A.P. Beardmore, P.A. Evans, M.R. Goad and J.P. Osborne (U. Leicester) report on behalf of the Swift-XRT team.
Using 1822 s of XRT Photon Counting mode data and 5 UVOT images for GRB 200205B, 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 = 107.78760, -56.48741 which is equivalent to:
```
RA (J2000): 07h 11m 9.03s
Dec (J2000): -56d 29' 14.7"
```
with an uncertainty of 1.6 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 #27001
J.P. Osborne (U. Leicester), M. Capalbi (INAF-IASFPA), M. Perri (ASDC), V. D'Elia (ASDC), J. D. Gropp (PSU), J.A. Kennea (PSU), A. Tohuvavohu (U. Toronto), K.L. Page (U. Leicester), A.P. Beardmore (U. Leicester) and P.A. Evans report on behalf of the Swift-XRT team:
We have analysed 6.5 ks of XRT data for GRB 200205B (Evans et al. GCN Circ. 26993), from 332 s to 46.4 ks after the BAT trigger. The data comprise 360 s in Windowed Timing (WT) mode (the first 8 s were taken while Swift was slewing) with the remainder in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Beardmore et al. (GCN Circ. 26999).
The late-time light curve (from T0+5.3 ks) can be modelled with a power-law decay with a decay index of alpha=0.76 (+0.14, -0.13).
A spectrum formed from the WT mode data can be fitted with an absorbed power-law with a photon spectral index of 1.129 (+0.027, -0.026). The best-fitting absorption column is 4.9 (+1.2, -1.1) x 10^21 cm^-2, at a redshift of 1.465, in addition to the Galactic value of 1.0 x 10^21 cm^-2 (Willingale et al. 2013). The PC mode spectrum has a photon index of 1.93 (+0.19, -0.13) and a best-fitting absorption column of 1 (+35, -1) x 10^20 cm^-2. The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 3.5 x 10^-11 (4.2 x 10^-11) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
```
Galactic foreground: 1.0 x 10^21 cm^-2
Intrinsic column:    1 (+35, -1) x 10^20 cm^-2 at z=1.465
Photon index:	     1.93 (+0.19, -0.13)
```
If the light curve continues to decay with a power-law decay index of 0.76, the count rate at T+24 hours will be 0.018 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 6.1 x 10^-13 (7.4 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/00954519.
This circular is an official product of the Swift-XRT team.
GCN Circular #27004
D. B. Malesani (DTU Space), D. M. Russell, P. Saikia, M. C. Baglio (NYU Abu Dhabi), report:
The optical counterpart of GRB 200205B (Evans et al., GCN 26993; Strausbaugh & Cucchiara, GCN 26995; Vielfaure et al., GCN 26998) was observed with the ESO New Technology Telescope equipped with the SofI imager on two different epochs during the night of 2020 Feb 5-6. Observations were carried out under ESO program 0104.D-0945(A) (PI Russell).
The afterglow is well detected in the first epoch in the J and Ks filters, and is marginally detected in the second observation. Calibrated to the 2MASS survey, we obtain the following magnitudes (Vega):
```
K = 18.07 +- 0.10� on Feb 6.164 UT� (0.356 days after the GRB)
J = 19.43 +- 0.10� on Feb 6.145 UT� (0.338 days after the GRB)
J = 20.57 +- 0.33� on Feb 6.368 UT� (0.561 days after the GRB)
```
GCN Circular #27006
GRB 200205B: Swift/UVOT Detection
K. K. Simpson (PSU) and P. A. Evans (U. Leicester) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 200205B 352 s after the BAT trigger (Evans et al., GCN Circ. 26993). A source consistent with the XRT position (Evans et al. GCN Circ. 26993) is detected in the initial UVOT exposures.
The preliminary UVOT position is:
```
    RA  (J2000) =  07:11:09.15 = 107.78812 (deg.)
    Dec (J2000) = -56:29:15.3  = -56.48759 (deg.)
```
with an estimated uncertainty of 0.42 arc sec. (radius, 90% confidence).
Preliminary detections and 3-sigma upper limits using the UVOT photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the early exposures are:
```
Filter         T_start(s)   T_stop(s)      Exp(s)           Mag

white           6386           6586          196          18.92+-0.10
white           383            1042           478          16.81+-0.03
v                  540             733          38             16.88 +/-
0.17
b                  638            833           38             17.74 +/-
0.15
u                  614            808           38             17.25 +/-
0.16
w1                 589           783           38            16.88+-0.20
m2                 564          758           38             17.12 +/- 0.28
w2                 689          1056         46              >17.77
```
The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.11 in the direction of the burst (Schlegel et al. 1998).
GCN Circular #27012
T. N. Ukwatta (LANL), S. D. Barthelmy (GSFC), J. R. Cummings (CPI), P. A. Evans (U Leicester), H. A. Krimm (NSF), S. Laha (GSFC/UMBC), A. Y. Lien (GSFC/UMBC), C. B. Markwardt (GSFC), D. M. Palmer (LANL), T. Sakamoto (AGU), M. Stamatikos (OSU) (i.e. the Swift-BAT team):
Using the data set from T-239 to T+1361 sec from the recent telemetry downlink, we report further analysis of BAT GRB 200205B (trigger #954519 and #954520) (Evans et al., GCN Circ. 26993). We have combined the data from two triggers (#954519 and #954520) for the analysis. All the times in this circular are relative to the trigger time from #954519.
The BAT ground-calculated position is RA, Dec = 107.760, -56.488 deg which is
```
   RA(J2000)  =  07h 11m 02.3s
   Dec(J2000) = -56d 29' 18.1"
```
with an uncertainty of 1.8 arcmin, (radius, sys+stat, 90% containment). The partial coding was 47%.
The mask-weighted light curve shows several pulses that start from ~T+20 s and end at ~T+550 s. The first prominent pulse occurs at ~T+60 s, followed by another significant structure with several overlapping pulses from ~T+380 s to ~T+520 s. There is a data gap from T+63 s to T+160 s, likely due to problems of saving data because of the double triggers. T90 (15-350 keV) is 458.0 +- 5.4 sec (estimated error including systematics).
Because of the data gap for part of the first pulse, we performed the time-averaged spectrum for the interval of the second multi-pulse structure from T+387.008 to T+520.396 sec. This interval is best fit by a power law with an exponential cutoff. This fit gives a photon index 1.36 +- 0.22, and Epeak of 65.6 +- 10.8 keV (chi squared 41.92 for 56 d.o.f.). For this model the total fluence in the 15-150 keV band is 5.4 +- 0.2 x 10^-6 erg/cm2 and the 1-sec peak flux measured from T+438 sec in the 15-150 keV band is 2.0 +- 0.2 ph/cm2/sec. A fit to a simple power law gives a photon index of 1.84 +- 0.05 (chi squared 58.00 for 57 d.o.f.). 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/954519/BA/
GCN Circular #27027
E. Mazaeva (IKI), A. Pozanenko (IKI), M. Krugov (AFIF), A. Volnova (IKI), S. Belkin (IKI) report on behalf of IKI-FuN follow-up collaboration:
We observed the Swift GRB 200205B (Evans et al., GCN 26993) with Chilescope RC-1000 started on Feb. 7 (UT) 03:04:55 in r'-filter. We marginally detect optical afterglow (Lipunov et al., GCN 26991; Evans et al., GCN 26993; Strausbaugh et al., GCN 26995; Vielfaure et al., GCN 26998; Malesani et al., GCN 27004; Simpson et al., GCN 27006).
Preliminary photometry is following.
```
Date       UT start MJD_mid     Filter Exp.   OT(AB) S/N UL
                     (mid, days)    (s)

2020-02-07 03:04:55 1.33613     r'     2*1200 22.2   2.0 22.0
```
The photometry is based on nearby stars from the SkyMapper catalog
```
SkyMapper_id    r
293365688    17.550
293359963    16.213
293359881    15.816
293365677    17.659
```
GCN Circular #27034
A. Tsvetkova, S. Golenetskii, R.Aptekar, D. Frederiks, M. Ulanov, D. Svinkin, A. Lysenko, A. Ridnaia and T. Cline on behalf of the Konus-Wind team, report:
The long GRB 200205B which triggered Swift/BAT at T0=T0(BAT)=19:21:43 UT (Swift/BAT detection: Evans et al., GCN 26993; Ukwatta et al., GCN 27012;) was detected by Konus-Wind in the waiting mode.
The burst light curve shows two emission episodes: the first pulse lasts from ~T0+48.6 s to ~T0+89.8 s, and the second pulse lasts from ~T0+390.1 s to ~T0+525.5 s. The total duration of the burst is ~477 s.
As observed by Konus-Wind, the burst had a fluence of 1.12(-0.05,0.26)x10^-5 erg/cm2 and a 2.944-s peak flux, measured from ~T0(BAT)+437.202 s, of 1.55(-0.09,+0.44)x10^-7 erg/cm2/s (both in the 20 keV - 10 MeV energy range).
Fitting the K-W 3-channel spectrum o the initial pulse (from ~T0(BAT)+48.594 s to ~T0(BAT)+89.810 s) in the 20 keV - 1.5 MeV range by a simple power law model yields the PL index = 2.34(-0.06,+0.17), chi2 = 2.95 / 1 dof.
Modelling the K-W 3-channel spectrum of the second pulse (from ~T0(BAT)+390.098 s to ~T0(BAT)+446.034 s) in the 20 keV - 1.5 MeV range by a power law with exponential cutoff model dN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep) yields alpha = -1.32(-0.59,+2.70), and Ep =87(-17,+13) keV.
Assuming the redshift z=1.465 (Vielfaure et al., GCN 26998) and a standard cosmology model with H_0 = 67.3 km/s/Mpc, Omega_M = 0.315, and Omega_Lambda = 0.685 (Planck Collaboration, 2014), we estimate the following rest-frame parameters: the isotropic energy release E_iso is ~6.5x10^52 erg, the peak luminosity L_iso is ~2.2x10^51 erg/s, and the rest-frame peak energy of the initial pulse spectrum, Ep,z, is ~ 214 keV.
All the quoted errors are estimated at the 1 sigma confidence level. All the presented results are preliminary.
The K-W light curve of this burst is available at http://www.ioffe.rssi.ru/LEA/GRBs/GRB200205B/

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Jochen Greiner, last update: 11-Feb-2020 [Disclaimer]