Gamma-ray Burst 210209A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

none

Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 09 Feb 21 21:40:43 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     1031636,   Seg_Num: 0
GRB_RA:          328.096d {+21h 52m 23s} (J2000),
                 328.308d {+21h 53m 14s} (current),
                 327.596d {+21h 50m 23s} (1950)
GRB_DEC:         +43.559d {+43d 33' 31"} (J2000),                                                   
                 +43.659d {+43d 39' 31"} (current),
                 +43.323d {+43d 19' 23"} (1950)                                                    
GRB_ERROR:       3.00 [arcmin radius, statistical only]                                           
GRB_INTEN:       33045 [cnts]    Image_Peak=781 [image_cnts]                                      
TRIGGER_DUR:     12.160 [sec]                                                                     
TRIGGER_INDEX:   478     E_range: 25-100 keV                                                      
BKG_INTEN:       156529 [cnts]                                                                    
BKG_TIME:        77885.52 SOD {21:38:05.52} UT                                                    
BKG_DUR:         64 [sec]                                                                         
GRB_DATE:        19254 TJD;    40 DOY;   21/02/09                                                 
GRB_TIME:        77984.52 SOD {21:39:44.52} UT                                                    
GRB_PHI:         -11.13 [deg]                                                                     
GRB_THETA:        21.51 [deg]                                                                     
SOLN_STATUS:     0x3                                                                              
RATE_SIGNIF:     10.81 [sigma]                                                                    
IMAGE_SIGNIF:    10.25 [sigma]                                                                    
MERIT_PARAMS:     +1  +0  +0  +4  +2  +0  +0  +1 -52  +0 
SUN_POSTN:       323.75d {+21h 35m 00s}  -14.38d {-14d 22' 37"}
SUN_DIST:         58.19 [deg]   Sun_angle= -0.3 [hr] (East of Sun)
MOON_POSTN:      300.76d {+20h 03m 01s}  -23.84d {-23d 50' 35"} 
MOON_DIST:        72.09 [deg]
MOON_ILLUM:      4 [%]
GAL_COORDS:       91.89, -8.26 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      352.84, 51.68 [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 = 223.94,4.66 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 09 Feb 21 21:42:15 UT
NOTICE_TYPE:     Swift-XRT Image
TRIGGER_NUM:     1031636,   Seg_Num: 0
GRB_RA:          328.1251d {+21h 52m 30.0s} (J2000),
                 328.3366d {+21h 53m 20.7s} (current),
                 327.6248d {+21h 50m 29.9s} (1950)
GRB_DEC:         +43.5582d {+43d 33' 29.5"} (J2000),
                 +43.6581d {+43d 39' 29.2"} (current),
                 +43.3224d {+43d 19' 20.7"} (1950)
GRB_ERROR:       4.7 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       121 [cnts]
IMG_START_DATE:  19254 TJD;    40 DOY;   21/02/09
IMG_START_TIME:  78101.02 SOD {21:41:41.02} UT,   116.5 [sec] since BAT Trigger Time
CENTROID_X:      328.37,  raw= 328  [pixels]
CENTROID_Y:      334.55,  raw= 335  [pixels]
ROLL:            184.99 [deg]
GAIN:            2
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   85.94
GRB_POS_XRT_Z:   49.45
IMAGE_URL:       sw01031636000msxps_rw.img
SUN_POSTN:       323.75d {+21h 35m 00s}  -14.38d {-14d 22' 35"}
SUN_DIST:         58.19 [deg]   Sun_angle= -0.3 [hr] (East of Sun)
MOON_POSTN:      300.77d {+20h 03m 05s}  -23.84d {-23d 50' 28"}
MOON_DIST:        72.09 [deg]
MOON_ILLUM:      4 [%]
GAL_COORDS:       91.91, -8.28 [deg] galactic lon,lat of the burst
ECL_COORDS:      352.87, 51.67 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Image.  
COMMENTS:        The object found at this position is either a very bright burst or a cosmic ray hit.  
COMMENTS:        Examine the XRT Image to differentiate (CRs are much more compact); see examples at:  
COMMENTS:        http://www.swift.psu.edu/xrt/XRT_Postage_Stamp_Image_Photo_Gallery.htm .

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 09 Feb 21 21:42:17 UT
NOTICE_TYPE:     Swift-XRT Processed Image
TRIGGER_NUM:     1031636,   Seg_Num: 0
GRB_RA:          328.1251d {+21h 52m 30.0s} (J2000),
                 328.3366d {+21h 53m 20.7s} (current),
                 327.6248d {+21h 50m 29.9s} (1950)
GRB_DEC:         +43.5582d {+43d 33' 29.5"} (J2000),
                 +43.6581d {+43d 39' 29.2"} (current),
                 +43.3224d {+43d 19' 20.7"} (1950)
GRB_ERROR:       4.7 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       121 [cnts]
IMG_START_DATE:  19254 TJD;    40 DOY;   21/02/09
IMG_START_TIME:  78101.02 SOD {21:41:41.02} UT,   116.5 [sec] since BAT Trigger Time
CENTROID_X:      328.37,  raw= 328  [pixels]
CENTROID_Y:      334.55,  raw= 335  [pixels]
ROLL:            184.99 [deg]
GAIN:            2
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   85.94
GRB_POS_XRT_Z:   49.45
IMAGE_URL:       sw01031636000msxps_rw.img
SUN_POSTN:       323.75d {+21h 35m 00s}  -14.38d {-14d 22' 35"}
SUN_DIST:         58.19 [deg]   Sun_angle= -0.3 [hr] (East of Sun)
MOON_POSTN:      300.77d {+20h 03m 05s}  -23.84d {-23d 50' 28"}
MOON_DIST:        72.09 [deg]
MOON_ILLUM:      4 [%]
GAL_COORDS:       91.91, -8.28 [deg] galactic lon,lat of the burst
ECL_COORDS:      352.87, 51.67 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Processed Image.  
COMMENTS:        The object found at this position is either a very bright burst or a cosmic ray hit.  
COMMENTS:        Examine the XRT Image to differentiate (CRs are much more compact); see examples at:  
COMMENTS:        http://www.swift.psu.edu/xrt/XRT_Postage_Stamp_Image_Photo_Gallery.htm .

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 09 Feb 21 21:42:05 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     1031636,   Seg_Num: 0
GRB_RA:          328.1251d {+21h 52m 30.02s} (J2000),
                 328.3366d {+21h 53m 20.79s} (current),
                 327.6248d {+21h 50m 29.94s} (1950)
GRB_DEC:         +43.5582d {+43d 33' 29.5"} (J2000),
                 +43.6581d {+43d 39' 29.2"} (current),
                 +43.3224d {+43d 19' 20.7"} (1950)
GRB_ERROR:       4.9 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       3.98e-09 [erg/cm2/sec]
GRB_SIGNIF:      11.00 [sigma]
IMG_START_DATE:  19254 TJD;    40 DOY;   21/02/09
IMG_START_TIME:  78101.02 SOD {21:41:41.02} UT,   116.5 [sec] since BAT Trigger Time
TAM[0-3]:        327.65 237.21 261.62 243.36
AMPLIFIER:       2
WAVEFORM:        134
SUN_POSTN:       323.75d {+21h 35m 00s}  -14.38d {-14d 22' 36"}
SUN_DIST:         58.19 [deg]   Sun_angle= -0.3 [hr] (East of Sun)
MOON_POSTN:      300.77d {+20h 03m 05s}  -23.84d {-23d 50' 29"}
MOON_DIST:        72.09 [deg]
MOON_ILLUM:      4 [%]
GAL_COORDS:       91.91, -8.28 [deg] galactic lon,lat of the burst
ECL_COORDS:      352.87, 51.67 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        The XRT position is 1.25 arcmin from the BAT position.  
COMMENTS:        The object found at this position is either a very bright burst or a cosmic ray hit.  
COMMENTS:        Examine the XRT Image to differentiate (CRs are much more compact); see examples at:  
COMMENTS:        http://www.swift.psu.edu/xrt/XRT_Postage_Stamp_Image_Photo_Gallery.htm .

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 09 Feb 21 21:43:50 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     1031636,   Seg_Num: 0
GRB_RA:          328.096d {+21h 52m 23s} (J2000),
                 328.308d {+21h 53m 14s} (current),
                 327.596d {+21h 50m 23s} (1950)
GRB_DEC:         +43.559d {+43d 33' 31"} (J2000),
                 +43.659d {+43d 39' 31"} (current),
                 +43.323d {+43d 19' 23"} (1950)
GRB_DATE:        19254 TJD;    40 DOY;   21/02/09
GRB_TIME:        77984.52 SOD {21:39:44.52} UT
TRIGGER_INDEX:   478
GRB_PHI:         -11.13 [deg]
GRB_THETA:        21.51 [deg]
DELTA_TIME:      19.00 [sec]
TRIGGER_DUR:     12.160 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     10.81 [sigma]
IMAGE_SIGNIF:    10.25 [sigma]
LC_URL:          sw01031636000msb.lc
SUN_POSTN:       323.75d {+21h 35m 00s}  -14.38d {-14d 22' 34"}
SUN_DIST:         58.18 [deg]   Sun_angle= -0.3 [hr] (East of Sun)
MOON_POSTN:      300.79d {+20h 03m 09s}  -23.84d {-23d 50' 20"}
MOON_DIST:        72.07 [deg]
MOON_ILLUM:      4 [%]
GAL_COORDS:       91.89, -8.26 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      352.84, 51.68 [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 = 223.94,4.66 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 09 Feb 21 21:45:26 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     1031636,   Seg_Num: 0
POINT_RA:        328.090d {+21h 52m 22s} (J2000)
POINT_DEC:       +43.546d {+43d 32' 46"} (J2000)
POINT_ROLL:      184.985d
IMG_START_DATE:  19254 TJD;    40 DOY;   21/02/09
IMG_START_TIME:  78111.19 SOD {21:41:51.19} UT,   126.7 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        4.379
N_STARS:         190
X_OFFSET:        312 [pixels]
Y_OFFSET:        460 [pixels]
X_MAX:           1271 [pixels]
Y_MAX:           1419 [pixels]
DET_THRESH:      17
PHOTO_THRESH:    10
SL_URL:          sw01031636000msufc0126.fits
SUN_POSTN:       323.75d {+21h 35m 01s}  -14.38d {-14d 22' 33"}
SUN_DIST:         58.17 [deg]   Sun_angle= -0.3 [hr] (East of Sun)
MOON_POSTN:      300.80d {+20h 03m 13s}  -23.84d {-23d 50' 13"}
MOON_DIST:        72.05 [deg]
MOON_ILLUM:      4 [%]
GAL_COORDS:       91.88, -8.27 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      352.82, 51.67 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 09 Feb 21 21:45:47 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     1031636,   Seg_Num: 0
POINT_RA:        328.090d {+21h 52m 22s} (J2000)
POINT_DEC:       +43.546d {+43d 32' 46"} (J2000)
POINT_ROLL:      184.985d
IMG_START_DATE:  19254 TJD;    40 DOY;   21/02/09
IMG_START_TIME:  78111.19 SOD {21:41:51.19} UT,   126.7 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        4.379
N_STARS:         190
X_OFFSET:        312 [pixels]
Y_OFFSET:        460 [pixels]
X_MAX:           1271 [pixels]
Y_MAX:           1419 [pixels]
DET_THRESH:      17
PHOTO_THRESH:    10
SL_URL:          sw01031636000msufc0126.fits
SUN_POSTN:       323.75d {+21h 35m 01s}  -14.38d {-14d 22' 33"}
SUN_DIST:         58.17 [deg]   Sun_angle= -0.3 [hr] (East of Sun)
MOON_POSTN:      300.81d {+20h 03m 14s}  -23.84d {-23d 50' 11"}
MOON_DIST:        72.05 [deg]
MOON_ILLUM:      4 [%]
GAL_COORDS:       91.88, -8.27 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      352.82, 51.67 [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:     Tue 09 Feb 21 21:47:36 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     1031636,   Seg_Num: 0
POINT_RA:        328.090d {+21h 52m 22s} (J2000)
POINT_DEC:       +43.546d {+43d 32' 46"} (J2000)
ROLL:            184.985d
IMG_START_DATE:  19254 TJD;    40 DOY;   21/02/09
IMG_START_TIME:  78111.19 SOD {21:41:51.19} UT,   126.7 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     634599737
X_OFFSET:        632 [pixels]
Y_OFFSET:        780 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       792
Y_GRB_POS:       940
BINNING_INDEX:   1
IM_URL:          sw01031636000msuni0153.fits
SUN_POSTN:       323.75d {+21h 35m 01s}  -14.38d {-14d 22' 31"}
SUN_DIST:         58.17 [deg]   Sun_angle= -0.3 [hr] (East of Sun)
MOON_POSTN:      300.83d {+20h 03m 18s}  -23.83d {-23d 50' 03"}
MOON_DIST:        72.04 [deg]
MOON_ILLUM:      4 [%]
GAL_COORDS:       91.88, -8.27 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      352.82, 51.67 [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:     Tue 09 Feb 21 21:47:49 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     1031636,   Seg_Num: 0
POINT_RA:        328.090d {+21h 52m 22s} (J2000)
POINT_DEC:       +43.546d {+43d 32' 46"} (J2000)
ROLL:            184.985d
IMG_START_DATE:  19254 TJD;    40 DOY;   21/02/09
IMG_START_TIME:  78111.19 SOD {21:41:51.19} UT,   126.7 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     634599737
X_OFFSET:        632 [pixels]
Y_OFFSET:        780 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       792
Y_GRB_POS:       940
BINNING_INDEX:   1
IM_URL:          sw01031636000msuni0153.fits
SUN_POSTN:       323.75d {+21h 35m 01s}  -14.38d {-14d 22' 31"}
SUN_DIST:         58.17 [deg]   Sun_angle= -0.3 [hr] (East of Sun)
MOON_POSTN:      300.83d {+20h 03m 19s}  -23.83d {-23d 50' 02"}
MOON_DIST:        72.04 [deg]
MOON_ILLUM:      4 [%]
GAL_COORDS:       91.88, -8.27 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      352.82, 51.67 [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 Circular #29442
S. Laha (GSFC/UMBC/CRESST), S. D. Barthelmy (GSFC), J.D. Gropp (PSU), J. A. Kennea (PSU), N. J. Klingler (PSU), F. E. Marshall (NASA/GSFC), K. L. Page (U Leicester) and D. M. Palmer (LANL) report on behalf of the Neil Gehrels Swift Observatory Team:
At 21:39:44 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 210209A (trigger=1031636). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 328.096, +43.559 which is
```
   RA(J2000) = 21h 52m 23s
   Dec(J2000) = +43d 33' 31"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a double-peaked structure with a duration of about 110 sec. The peak count rate was ~1600 counts/sec (15-350 keV), at ~5 sec after the trigger.
The XRT began observing the field at 21:41:41.0 UT, 116.5 seconds after the BAT trigger. Using promptly downlinked data we find a bright, uncatalogued X-ray source located at RA, Dec 328.12298, 43.55745 which is equivalent to:
```
   RA(J2000)  = 21h 52m 29.52s
   Dec(J2000) = +43d 33' 26.8"
```
with an uncertainty of 3.5 arcseconds (radius, 90% containment). This location is 70 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. No spectrum from the promptly downlinked event data is yet available to determine the column density.
The initial flux in the 2.5 s image was 3.98e-09 erg cm^-2 s^-1 (0.2-10 keV).
UVOT took a finding chart exposure of 150 seconds with the White filter starting 126 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 100% of the XRT error circle. The typical 3-sigma upper limit has been about 19.6 mag. 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 expected extinction corresponding to E(B-V) of 0.285.
Burst Advocate for this burst is S. Laha (sib.laha 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:     Tue 09 Feb 21 21:53:37 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     1031636,   Seg_Num: 0
POINT_RA:        328.093d {+21h 52m 22s} (J2000)
POINT_DEC:       +43.547d {+43d 32' 48"} (J2000)
POINT_ROLL:      184.988d
IMG_START_DATE:  19254 TJD;    40 DOY;   21/02/09
IMG_START_TIME:  78269.26 SOD {21:44:29.26} UT,   284.7 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        1.814
N_STARS:         175
X_OFFSET:        312 [pixels]
Y_OFFSET:        460 [pixels]
X_MAX:           1271 [pixels]
Y_MAX:           1419 [pixels]
DET_THRESH:      11
PHOTO_THRESH:    6
SL_URL:          sw01031636000msufc0284.fits
SUN_POSTN:       323.76d {+21h 35m 02s}  -14.37d {-14d 22' 26"}
SUN_DIST:         58.17 [deg]   Sun_angle= -0.3 [hr] (East of Sun)
MOON_POSTN:      300.89d {+20h 03m 33s}  -23.83d {-23d 49' 34"}
MOON_DIST:        72.02 [deg]
MOON_ILLUM:      4 [%]
GAL_COORDS:       91.88, -8.27 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      352.83, 51.67 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 09 Feb 21 21:53:54 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     1031636,   Seg_Num: 0
POINT_RA:        328.093d {+21h 52m 22s} (J2000)
POINT_DEC:       +43.547d {+43d 32' 48"} (J2000)
POINT_ROLL:      184.988d
IMG_START_DATE:  19254 TJD;    40 DOY;   21/02/09
IMG_START_TIME:  78269.26 SOD {21:44:29.26} UT,   284.7 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        1.814
N_STARS:         175
X_OFFSET:        312 [pixels]
Y_OFFSET:        460 [pixels]
X_MAX:           1271 [pixels]
Y_MAX:           1419 [pixels]
DET_THRESH:      11
PHOTO_THRESH:    6
SL_URL:          sw01031636000msufc0284.fits
SUN_POSTN:       323.76d {+21h 35m 02s}  -14.37d {-14d 22' 26"}
SUN_DIST:         58.17 [deg]   Sun_angle= -0.3 [hr] (East of Sun)
MOON_POSTN:      300.89d {+20h 03m 34s}  -23.83d {-23d 49' 33"}
MOON_DIST:        72.01 [deg]
MOON_ILLUM:      4 [%]
GAL_COORDS:       91.88, -8.27 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      352.83, 51.67 [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:     Tue 09 Feb 21 21:55:04 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     1031636,   Seg_Num: 0
POINT_RA:        328.093d {+21h 52m 22s} (J2000)
POINT_DEC:       +43.547d {+43d 32' 48"} (J2000)
ROLL:            184.988d
IMG_START_DATE:  19254 TJD;    40 DOY;   21/02/09
IMG_START_TIME:  78269.26 SOD {21:44:29.26} UT,   284.7 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     634599895
X_OFFSET:        632 [pixels]
Y_OFFSET:        780 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       792
Y_GRB_POS:       940
BINNING_INDEX:   1
IM_URL:          sw01031636000msuni0311.fits
SUN_POSTN:       323.76d {+21h 35m 02s}  -14.37d {-14d 22' 25"}
SUN_DIST:         58.17 [deg]   Sun_angle= -0.3 [hr] (East of Sun)
MOON_POSTN:      300.90d {+20h 03m 36s}  -23.82d {-23d 49' 28"}
MOON_DIST:        72.01 [deg]
MOON_ILLUM:      4 [%]
GAL_COORDS:       91.88, -8.27 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      352.83, 51.67 [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:     Tue 09 Feb 21 21:55:11 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     1031636,   Seg_Num: 0
POINT_RA:        328.093d {+21h 52m 22s} (J2000)
POINT_DEC:       +43.547d {+43d 32' 48"} (J2000)
ROLL:            184.988d
IMG_START_DATE:  19254 TJD;    40 DOY;   21/02/09
IMG_START_TIME:  78269.26 SOD {21:44:29.26} UT,   284.7 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     634599895
X_OFFSET:        632 [pixels]
Y_OFFSET:        780 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       792
Y_GRB_POS:       940
BINNING_INDEX:   1
IM_URL:          sw01031636000msuni0311.fits
SUN_POSTN:       323.76d {+21h 35m 02s}  -14.37d {-14d 22' 25"}
SUN_DIST:         58.17 [deg]   Sun_angle= -0.3 [hr] (East of Sun)
MOON_POSTN:      300.90d {+20h 03m 37s}  -23.82d {-23d 49' 27"}
MOON_DIST:        72.01 [deg]
MOON_ILLUM:      4 [%]
GAL_COORDS:       91.88, -8.27 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      352.83, 51.67 [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:     Tue 09 Feb 21 22:00:03 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     1031636,   Seg_Num: 0
POINT_RA:        328.093d {+21h 52m 22s} (J2000)
POINT_DEC:       +43.547d {+43d 32' 48"} (J2000)
POINT_ROLL:      184.988d
IMG_START_DATE:  19254 TJD;    40 DOY;   21/02/09
IMG_START_TIME:  78846.53 SOD {21:54:06.53} UT,   862.0 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        3.986
N_STARS:         190
X_OFFSET:        72 [pixels]
Y_OFFSET:        220 [pixels]
X_MAX:           1511 [pixels]
Y_MAX:           1659 [pixels]
DET_THRESH:      17
PHOTO_THRESH:    9
SL_URL:          sw01031636000msufc0862.fits
SUN_POSTN:       323.76d {+21h 35m 03s}  -14.37d {-14d 22' 21"}
SUN_DIST:         58.17 [deg]   Sun_angle= -0.3 [hr] (East of Sun)
MOON_POSTN:      300.95d {+20h 03m 49s}  -23.82d {-23d 49' 04"}
MOON_DIST:        71.99 [deg]
MOON_ILLUM:      4 [%]
GAL_COORDS:       91.88, -8.27 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      352.83, 51.67 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 09 Feb 21 22:00:20 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     1031636,   Seg_Num: 0
POINT_RA:        328.093d {+21h 52m 22s} (J2000)
POINT_DEC:       +43.547d {+43d 32' 48"} (J2000)
POINT_ROLL:      184.988d
IMG_START_DATE:  19254 TJD;    40 DOY;   21/02/09
IMG_START_TIME:  78846.53 SOD {21:54:06.53} UT,   862.0 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        3.986
N_STARS:         190
X_OFFSET:        72 [pixels]
Y_OFFSET:        220 [pixels]
X_MAX:           1511 [pixels]
Y_MAX:           1659 [pixels]
DET_THRESH:      17
PHOTO_THRESH:    9
SL_URL:          sw01031636000msufc0862.fits
SUN_POSTN:       323.76d {+21h 35m 03s}  -14.37d {-14d 22' 21"}
SUN_DIST:         58.17 [deg]   Sun_angle= -0.3 [hr] (East of Sun)
MOON_POSTN:      300.96d {+20h 03m 49s}  -23.82d {-23d 49' 03"}
MOON_DIST:        71.98 [deg]
MOON_ILLUM:      4 [%]
GAL_COORDS:       91.88, -8.27 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      352.83, 51.67 [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:     Tue 09 Feb 21 22:02:01 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     1031636,   Seg_Num: 0
POINT_RA:        328.093d {+21h 52m 22s} (J2000)
POINT_DEC:       +43.547d {+43d 32' 48"} (J2000)
ROLL:            184.988d
IMG_START_DATE:  19254 TJD;    40 DOY;   21/02/09
IMG_START_TIME:  78846.53 SOD {21:54:06.53} UT,   862.0 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     634600473
X_OFFSET:        631 [pixels]
Y_OFFSET:        779 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       791
Y_GRB_POS:       939
BINNING_INDEX:   1
IM_URL:          sw01031636000msuni0889.fits
SUN_POSTN:       323.76d {+21h 35m 03s}  -14.37d {-14d 22' 19"}
SUN_DIST:         58.17 [deg]   Sun_angle= -0.3 [hr] (East of Sun)
MOON_POSTN:      300.97d {+20h 03m 53s}  -23.82d {-23d 48' 55"}
MOON_DIST:        71.98 [deg]
MOON_ILLUM:      4 [%]
GAL_COORDS:       91.88, -8.27 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      352.83, 51.67 [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:     Tue 09 Feb 21 22:02:09 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     1031636,   Seg_Num: 0
POINT_RA:        328.093d {+21h 52m 22s} (J2000)
POINT_DEC:       +43.547d {+43d 32' 48"} (J2000)
ROLL:            184.988d
IMG_START_DATE:  19254 TJD;    40 DOY;   21/02/09
IMG_START_TIME:  78846.53 SOD {21:54:06.53} UT,   862.0 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     634600473
X_OFFSET:        631 [pixels]
Y_OFFSET:        779 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       791
Y_GRB_POS:       939
BINNING_INDEX:   1
IM_URL:          sw01031636000msuni0889.fits
SUN_POSTN:       323.76d {+21h 35m 03s}  -14.37d {-14d 22' 19"}
SUN_DIST:         58.17 [deg]   Sun_angle= -0.3 [hr] (East of Sun)
MOON_POSTN:      300.97d {+20h 03m 54s}  -23.82d {-23d 48' 54"}
MOON_DIST:        71.98 [deg]
MOON_ILLUM:      4 [%]
GAL_COORDS:       91.88, -8.27 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      352.83, 51.67 [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:     Tue 09 Feb 21 22:12:35 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     1031636,   Seg_Num: 0
GRB_RA:          328.1238d {+21h 52m 29.71s} (J2000),
                 328.3353d {+21h 53m 20.48s} (current),
                 327.6235d {+21h 50m 29.63s} (1950)
GRB_DEC:         +43.5570d {+43d 33' 25.2"} (J2000),
                 +43.6569d {+43d 39' 24.8"} (current),
                 +43.3212d {+43d 19' 16.4"} (1950)
GRB_ERROR:       3.5 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  19254 TJD;    40 DOY;   21/02/09
IMG_START_TIME:  78248.00 SOD {21:44:08.00} UT,   263.5 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       323.77d {+21h 35m 05s}  -14.37d {-14d 22' 11"}
SUN_DIST:         58.18 [deg]   Sun_angle= -0.3 [hr] (East of Sun)
MOON_POSTN:      301.08d {+20h 04m 19s}  -23.80d {-23d 48' 05"}
MOON_DIST:        71.95 [deg]
MOON_ILLUM:      4 [%]
GAL_COORDS:       91.91, -8.28 [deg] galactic lon,lat of the burst
ECL_COORDS:      352.87, 51.67 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        This is an Update Notice -- the RA,Dec values herein supersede the previous XRT_POS Notice.  
COMMENTS:        TAM values, flux and significance fields are not valid.  
COMMENTS:        This position was automatically generated on the ground using  
COMMENTS:        Photon Counting data telemetered via TDRSS (SPER data).  
COMMENTS:        See http://www.swift.ac.uk/sper/docs.php for details.  
COMMENTS:        The probability that this is a serendipitous source in the  
COMMENTS:        SPER window is 0.11% < P(seren) < 0.58%.

GCN Circular #29443
P.A. Evans, M.R. Goad, J.P. Osborne and A.P. Beardmore (U. Leicester) report on behalf of the Swift-XRT team.
Using 1987 s of XRT Photon Counting mode data and 4 UVOT images for GRB 210209A, 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 = 328.12225, +43.55698 which is equivalent to:
```
RA (J2000): 21h 52m 29.34s
Dec (J2000): +43d 33' 25.1"
```
with an uncertainty of 1.5 arcsec (radius, 90% confidence).
This position may be improved as more data are received. The latest position can be viewed at http://www.swift.ac.uk/xrt_positions. Position enhancement is described by Goad et al. (2007, A&A, 476, 1401) and Evans et al. (2009, MNRAS, 397, 1177).
This circular was automatically generated, and is an official product of the Swift-XRT team.
GCN Circular #29449
M. Perri (SSDC & INAF-OAR), V. D'Elia (SSDC & INAF-OAR), A. D'Ai (INAF-IASFPA), D.N. Burrows (PSU), J. D. Gropp (PSU), J.A. Kennea (PSU), A.P. Beardmore (U. Leicester), P.A. Evans (U. Leicester), J.P. Osborne (U. Leicester) and S. Laha report on behalf of the Swift-XRT team:
We have analysed 6.3 ks of XRT data for GRB 210209A (Laha et al. GCN Circ. 29442), from 122 s to 24.0 ks after the BAT trigger. The data comprise 139 s in Windowed Timing (WT) mode with the remainder in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Evans et al. (GCN Circ. 29443).
The late-time light curve (from T0+4.3 ks) can be modelled with a power-law decay with a decay index of alpha=0.88 (+/-0.09).
A spectrum formed from the WT mode data can be fitted with an absorbed power-law with a photon spectral index of 1.81 (+0.07, -0.04). The best-fitting absorption column is consistent with the Galactic value of 3.7 x 10^21 cm^-2 (Willingale et al. 2013). The PC mode spectrum has a photon index of 1.91 (+0.07, -0.05) and a best-fitting absorption column consistent with the Galactic value. The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 4.0 x 10^-11 (5.6 x 10^-11) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
```
Total column:	     3.67 (+0.14, -0.00) x 10^21 cm^-2
Galactic foreground: 3.7 x 10^21 cm^-2
Excess significance: <1.6 sigma
Photon index:	     1.91 (+0.07, -0.05)
```
If the light curve continues to decay with a power-law decay index of 0.88, the count rate at T+24 hours will be 0.046 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 1.9 x 10^-12 (2.6 x 10^-12) erg cm^-2 s^-1.
The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/01031636.
This circular is an official product of the Swift-XRT team.
GCN Circular #29453
A. A. Breeveld (UCL-MSSL) and S. L. Laha (GSFC/UMBC/CRESST) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 210209A 127 s after the BAT trigger (Laha et al., GCN Circ. 29442). No optical afterglow consistent with the XRT position (Evans et al., GCN Circ. 29443) 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           127          276          147         >20.3
u_FC               285          535          246         >19.4
white              127          952          275         >20.4
v                  615         4730          236         >19.1
b                  540          733           39         >18.8
u                  285         5225          345         >19.8
w1                 664         5140          236         >19.7
m2                 639         4934          236         >19.4
w2                 590         4525          236         >20.5
```
The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.286 in the direction of the burst (Schlegel et al. 1998).
GCN Circular #29455
R. Hosokawa, R. Adachi, K. L. Murata, M. Niwano, F. Ogawa, N. Nakamura, N. Ito, S. Ogata, H. Takamatsu, H. Hara, Y. Yatsu, and N. Kawai (TokyoTech) report on behalf of the MITSuME collaboration:
We observed the field of GRB 210209A (Laha et al. GCN #29442, Evans et al. GCN #29443, Perri et al. GCN #29449, Breeveld et al. GCN #29453) with the optical three color (g', Rc, and Ic) CCD cameras attached to the MITSuME 50 cm telescope of Akeno Observatory, Yamanashi, Japan. The observation with a series of 60 sec exposures started at 2021-02-10 08:49:41 UT(11.2 hour after the Swift BAT trigger). Since the first 17 images were taken under high airmass conditions, we stacked the images with good conditions. We did not find any new point sources within the enhanced Swift XRT circle (Evans et al. GCN #29443) in all three bands. We obtained the 5-sigma limits of the stacked images as follows.
```
T0+[hour] MID-UT T-EXP[sec] 5-sigma limits
------------------------------------------------------------------------------------------------
11.2 09:14:41 600 g'>17.2,Rc>17.6,Ic>17.1
------------------------------------------------------------------------------------------------
T0+ : Elapsed time after the burst
T-EXP: Total Exposure time
```
We used the PS1 catalog for flux calibration. The magnitudes are expressed in the AB system. The images were processed in real-time through the MITSuME GPU reduction pipeline (Niwano et al. 2021, PASJ, Vol.73, Issue 1, Pages 4-24; https://github.com/MNiwano/Eclaire).
GCN Circular #29458
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),
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-Tavrida robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Lomonosov MSU, SAI Crimea astronomical station) was pointed to the Swift GRB 210209A ( S. Laha et al., GCN 29442) errorbox 66257 sec after notice time and 66326 sec after trigger time at 2021-02-10 16:05:10 UT, with upper limit up to 17.5 mag. Observations started at twilight. The observations began at zenith distance = 60 deg. The sun altitude is -11.3 deg.
The galactic latitude b = -8 deg., longitude l = 92 deg.
Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=1543975
We obtain a following upper limits.
```
Tmid-T0  |          Site       |Filt.| Expt. | Limit| Comment
_________|_____________________|_____|_______|______|________

   66416 |      MASTER-Tavrida |   C |   180 | 17.5 |        
```
Filter C is a clear (unfiltred) band.
The observation and reduction will continue. The message may be cited.
GCN Circular #29460
Y.-D. Hu, E. Fernandez-Garcia, A. J. Castro-Tirado, M.D. Caballero-Garcia, M. A. Castro Tirado (IAA-CSIC), C. Perez del Pulgar, A. Castellon, I. Carrasco (Univ. de Malaga), S. Guziy (Univ. of Nikolaev) and D. R. Xiong, Y. F. Fan, J. M. Bai, C. J. Wang, Y. X. Xin, X. H. Zhao (Yunnan Observatories of CAS) on behalf of a larger collaboration, report:
Following the detection of GRB 210209A by Swift (Laha et al. GCNC 29442), the 0.6m BOOTES-4/MET robotic telescope at Lijiang Astronomical Observatory (China) started to gather images after the twilight as soon as it was possible. No new source is detected within the Swift/XRT enhanced position (Evans et al. GCNC 29443) down to 19.8 mag in the co-added images (15x60 s, clear filer) starting at 12:13 UT on Feb 10. The non-detection is consistent with the limits reported by both Swift/UVOT (Breeveld et al. GCNC 29453) and MITSuME (Hosokawa et al. GCNC 29455).
We thank the staff at Lijiang observatory for their excellent support.
GCN Circular #29479
S. Laha (GSFC/UMBC), S. D. Barthelmy (GSFC), H. A. Krimm (NSF), A. Y. Lien (GSFC/UMBC), C. B. Markwardt (GSFC), D. M. Palmer (LANL), T. Sakamoto (AGU), M. Stamatikos (OSU), T. N. Ukwatta (LANL) (i.e. the Swift-BAT team):
Using the data set from T-239 to T+800 sec from the recent telemetry downlink, we report further analysis of BAT GRB 210209A (trigger #1031636) (Laha, et al., GCN Circ. 29442). The BAT ground-calculated position is RA, Dec = 328.097, 43.545 deg which is
```
  RA(J2000)  =  21h 52m 23.3s 
  Dec(J2000) = +43d 32' 40.4" 
```
with an uncertainty of 1.6 arcmin, (radius, sys+stat, 90% containment). The partial coding was 96%.
The mask-weighted light curve shows a double-peaked structure running from roughly T-35 sec to T+140 seconds. The two peaks were at T+3 sec and T+65 sec. T90 (15-350 keV) is 139.4 +- 21.5 sec (estimated error including systematics).
The time-averaged spectrum from T-40.34 to T+134.72 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.52 +- 0.12. The fluence in the 15-150 keV band is 2.4 +- 0.2 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+2.68 sec in the 15-150 keV band is 0.6 +- 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/1031636/BA/

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Jochen Greiner, last update: 11-Feb-2021 [Disclaimer]