Gamma-ray Burst 210205A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

• none

• GCN/BACODINE POSITION NOTICE
  

  TITLE:           GCN/SWIFT NOTICE
  NOTICE_DATE:     Fri 05 Feb 21 11:12:14 UT
  NOTICE_TYPE:     Swift-BAT GRB Position
  TRIGGER_NUM:     1030629,   Seg_Num: 0
  GRB_RA:          347.257d {+23h 09m 02s} (J2000),
                   347.488d {+23h 09m 57s} (current),
                   346.710d {+23h 06m 50s} (1950)
  GRB_DEC:         +56.312d {+56d 18' 45"} (J2000),
                   +56.427d {+56d 25' 37"} (current),
                   +56.041d {+56d 02' 28"} (1950)
  GRB_ERROR:       3.00 [arcmin radius, statistical only]
  GRB_INTEN:       22869 [cnts]    Image_Peak=311 [image_cnts]
  TRIGGER_DUR:     8.192 [sec] 
  TRIGGER_INDEX:   456     E_range: 15-50 keV
  BKG_INTEN:       168139 [cnts]
  BKG_TIME:        40189.54 SOD {11:09:49.54} UT
  BKG_DUR:         64 [sec]
  GRB_DATE:        19250 TJD;    36 DOY;   21/02/05
  GRB_TIME:        40277.61 SOD {11:11:17.61} UT
  GRB_PHI:          11.93 [deg]
  GRB_THETA:        50.57 [deg]
  SOLN_STATUS:     0x3
  RATE_SIGNIF:     8.94 [sigma]
  IMAGE_SIGNIF:    8.16 [sigma]
  MERIT_PARAMS:     +1  +0  +0  +3  +1  -2  +0  +1 -24  +0 
  SUN_POSTN:       319.33d {+21h 17m 19s}  -15.78d {-15d 46' 34"}
  SUN_DIST:         75.96 [deg]   Sun_angle= -1.9 [hr] (East of Sun)
  MOON_POSTN:      234.53d {+15h 38m 07s}  -17.50d {-17d 30' 13"}
  MOON_DIST:       117.15 [deg]
  MOON_ILLUM:      42 [%]
  GAL_COORDS:      109.03, -3.77 [deg] galactic lon,lat of the burst (or transient)
  ECL_COORDS:       22.01, 54.30 [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 = 84.75,-5.79 [deg].  
  

• red DSS finding chart ps-file
  
  
• GCN NOTICE
  

  TITLE:           GCN/SWIFT NOTICE
  NOTICE_DATE:     Fri 05 Feb 21 11:13:41 UT
  NOTICE_TYPE:     Swift-XRT Nack-Position
  TRIGGER_NUM:     1030629,   Seg_Num: 0
  POINT_RA:        347.224d {+23h 08m 54s} (J2000)
  POINT_DEC:       +56.289d {+56d 17' 20"} (J2000)
  IMG_START_DATE:  19250 TJD;    36 DOY;   21/02/05
  IMG_START_TIME:  40412.26 SOD {11:13:32.26} UT,   134.7 [sec] since BAT Trigger Time
  COUNTS:          2    Min_needed= 20
  STD_DEV:         0.00   Max_StdDev_for_Good=28.44 [arcsec]
  PH2_ITER:        1    Max_iter_allowed= 4
  ERROR_CODE:      1
  COMMENTS:        SWIFT-XRT Nack Position.  
  COMMENTS:        No source found in the image.  
  

• GCN NOTICE
  

  TITLE:           GCN/SWIFT NOTICE
  NOTICE_DATE:     Fri 05 Feb 21 11:15:27 UT
  NOTICE_TYPE:     Swift-BAT GRB Lightcurve
  TRIGGER_NUM:     1030629,   Seg_Num: 0
  GRB_RA:          347.257d {+23h 09m 02s} (J2000),
                   347.488d {+23h 09m 57s} (current),
                   346.710d {+23h 06m 50s} (1950)
  GRB_DEC:         +56.312d {+56d 18' 45"} (J2000),
                   +56.427d {+56d 25' 37"} (current),
                   +56.041d {+56d 02' 28"} (1950)
  GRB_DATE:        19250 TJD;    36 DOY;   21/02/05
  GRB_TIME:        40277.61 SOD {11:11:17.61} UT
  TRIGGER_INDEX:   456
  GRB_PHI:          11.93 [deg]
  GRB_THETA:        50.57 [deg]
  DELTA_TIME:      -5.00 [sec]
  TRIGGER_DUR:     8.192 [sec] 
  SOLN_STATUS:     0x3
  RATE_SIGNIF:     8.94 [sigma]
  IMAGE_SIGNIF:    8.16 [sigma]
  LC_URL:          sw01030629000msb.lc
  SUN_POSTN:       319.33d {+21h 17m 19s}  -15.78d {-15d 46' 32"}
  SUN_DIST:         75.96 [deg]   Sun_angle= -1.9 [hr] (East of Sun)
  MOON_POSTN:      234.56d {+15h 38m 15s}  -17.51d {-17d 30' 49"}
  MOON_DIST:       117.14 [deg]
  MOON_ILLUM:      42 [%]
  GAL_COORDS:      109.03, -3.77 [deg] galactic lon,lat of the burst (or transient)
  ECL_COORDS:       22.01, 54.30 [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 = 84.75,-5.79 [deg].  
  

  
• GCN NOTICE
  

  TITLE:           GCN/SWIFT NOTICE
  NOTICE_DATE:     Fri 05 Feb 21 11:17:39 UT
  NOTICE_TYPE:     Swift-UVOT Source List
  TRIGGER_NUM:     1030629,   Seg_Num: 0
  POINT_RA:        347.224d {+23h 08m 54s} (J2000)
  POINT_DEC:       +56.289d {+56d 17' 19"} (J2000)
  POINT_ROLL:      207.699d
  IMG_START_DATE:  19250 TJD;    36 DOY;   21/02/05
  IMG_START_TIME:  40415.81 SOD {11:13:35.81} UT,   138.2 [sec] since BAT Trigger Time
  FILTER:          10, White
  BKG_MEAN:        5.121
  N_STARS:         190
  X_OFFSET:        273 [pixels]
  Y_OFFSET:        644 [pixels]
  X_MAX:           1232 [pixels]
  Y_MAX:           1603 [pixels]
  DET_THRESH:      19
  PHOTO_THRESH:    11
  SL_URL:          sw01030629000msufc0138.fits
  SUN_POSTN:       319.33d {+21h 17m 19s}  -15.78d {-15d 46' 30"}
  SUN_DIST:         75.93 [deg]   Sun_angle= -1.9 [hr] (East of Sun)
  MOON_POSTN:      234.58d {+15h 38m 20s}  -17.52d {-17d 31' 13"}
  MOON_DIST:       117.12 [deg]
  MOON_ILLUM:      42 [%]
  GAL_COORDS:      109.01, -3.79 [deg] galactic lon,lat of the pointing direction
  ECL_COORDS:       21.96, 54.29 [deg] ecliptic lon,lat of the pointing direction
  COMMENTS:        SWIFT-UVOT Source List.  
  

• GCN NOTICE
  

  TITLE:           GCN/SWIFT NOTICE
  NOTICE_DATE:     Fri 05 Feb 21 11:17:11 UT
  NOTICE_TYPE:     Swift-XRT Position
  TRIGGER_NUM:     1030629,   Seg_Num: 0
  GRB_RA:          347.2206d {+23h 08m 52.94s} (J2000),
                   347.4522d {+23h 09m 48.53s} (current),
                   346.6739d {+23h 06m 41.72s} (1950)
  GRB_DEC:         +56.2953d {+56d 17' 43.0"} (J2000),
                   +56.4099d {+56d 24' 35.6"} (current),
                   +56.0241d {+56d 01' 26.7"} (1950)
  GRB_ERROR:       4.2 [arcsec radius, statistical plus systematic, 90% containment]
  GRB_INTEN:       1.00e-10 [erg/cm2/sec]
  GRB_SIGNIF:      10.00 [sigma]
  IMG_START_DATE:  19250 TJD;    36 DOY;   21/02/05
  IMG_START_TIME:  40420.00 SOD {11:13:40.00} UT,   142.4 [sec] since BAT Trigger Time
  TAM[0-3]:        100.00 100.00 100.00 100.00
  AMPLIFIER:       1
  WAVEFORM:        31
  SUN_POSTN:       319.33d {+21h 17m 19s}  -15.78d {-15d 46' 30"}
  SUN_DIST:         75.93 [deg]   Sun_angle= -1.9 [hr] (East of Sun)
  MOON_POSTN:      234.58d {+15h 38m 19s}  -17.52d {-17d 31' 08"}
  MOON_DIST:       117.12 [deg]
  MOON_ILLUM:      42 [%]
  GAL_COORDS:      109.01, -3.78 [deg] galactic lon,lat of the burst
  ECL_COORDS:       21.97, 54.30 [deg] ecliptic lon,lat of the burst
  COMMENTS:        SWIFT-XRT Coordinates.  
  COMMENTS:        This Notice was ground-generated -- not flight-generated.  
  COMMENTS:        TAM values, flux and significance fields are not valid.  
  COMMENTS:        This position was automatically generated on the ground using  
  COMMENTS:        Photon Counting data telemetered via TDRSS (SPER data).  
  COMMENTS:        See http://www.swift.ac.uk/sper/docs.php for details.  
  COMMENTS:        The probability that this is a serendipitous source in the  
  COMMENTS:        SPER window is 0.58% < P(seren) < 1.1%.  
  

• GCN NOTICE
  

  TITLE:           GCN/SWIFT NOTICE
  NOTICE_DATE:     Fri 05 Feb 21 11:17:57 UT
  NOTICE_TYPE:     Swift-UVOT Processed Source List
  TRIGGER_NUM:     1030629,   Seg_Num: 0
  POINT_RA:        347.224d {+23h 08m 54s} (J2000)
  POINT_DEC:       +56.289d {+56d 17' 19"} (J2000)
  POINT_ROLL:      207.699d
  IMG_START_DATE:  19250 TJD;    36 DOY;   21/02/05
  IMG_START_TIME:  40415.81 SOD {11:13:35.81} UT,   138.2 [sec] since BAT Trigger Time
  FILTER:          10, White
  BKG_MEAN:        5.121
  N_STARS:         190
  X_OFFSET:        273 [pixels]
  Y_OFFSET:        644 [pixels]
  X_MAX:           1232 [pixels]
  Y_MAX:           1603 [pixels]
  DET_THRESH:      19
  PHOTO_THRESH:    11
  SL_URL:          sw01030629000msufc0138.fits
  SUN_POSTN:       319.33d {+21h 17m 19s}  -15.78d {-15d 46' 30"}
  SUN_DIST:         75.93 [deg]   Sun_angle= -1.9 [hr] (East of Sun)
  MOON_POSTN:      234.59d {+15h 38m 21s}  -17.52d {-17d 31' 16"}
  MOON_DIST:       117.12 [deg]
  MOON_ILLUM:      42 [%]
  GAL_COORDS:      109.01, -3.79 [deg] galactic lon,lat of the pointing direction
  ECL_COORDS:       21.96, 54.29 [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:     Fri 05 Feb 21 11:19:09 UT
  NOTICE_TYPE:     Swift-UVOT Image
  TRIGGER_NUM:     1030629,   Seg_Num: 0
  POINT_RA:        347.224d {+23h 08m 54s} (J2000)
  POINT_DEC:       +56.289d {+56d 17' 19"} (J2000)
  ROLL:            207.699d
  IMG_START_DATE:  19250 TJD;    36 DOY;   21/02/05
  IMG_START_TIME:  40415.81 SOD {11:13:35.81} UT,   138.2 [sec] since BAT Trigger Time
  FILTER:          10, White
  EXPOSURE_ID:     634216442
  X_OFFSET:        592 [pixels]
  Y_OFFSET:        963 [pixels]
  WIDTH:           160 [pixels]
  HEIGHT:          160 [pixels]
  X_GRB_POS:       752
  Y_GRB_POS:       1123
  BINNING_INDEX:   1
  IM_URL:          sw01030629000msuni0165.fits
  SUN_POSTN:       319.33d {+21h 17m 20s}  -15.77d {-15d 46' 29"}
  SUN_DIST:         75.93 [deg]   Sun_angle= -1.9 [hr] (East of Sun)
  MOON_POSTN:      234.60d {+15h 38m 24s}  -17.53d {-17d 31' 30"}
  MOON_DIST:       117.12 [deg]
  MOON_ILLUM:      42 [%]
  GAL_COORDS:      109.01, -3.79 [deg] galactic lon,lat of the pointing direction
  ECL_COORDS:       21.96, 54.29 [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:     Fri 05 Feb 21 11:19:37 UT
  NOTICE_TYPE:     Swift-UVOT Source List
  TRIGGER_NUM:     1030629,   Seg_Num: 0
  POINT_RA:        347.224d {+23h 08m 54s} (J2000)
  POINT_DEC:       +56.289d {+56d 17' 19"} (J2000)
  POINT_ROLL:      207.699d
  IMG_START_DATE:  19250 TJD;    36 DOY;   21/02/05
  IMG_START_TIME:  40573.75 SOD {11:16:13.75} UT,   296.1 [sec] since BAT Trigger Time
  FILTER:          7, U
  BKG_MEAN:        0.378
  N_STARS:         186
  X_OFFSET:        33 [pixels]
  Y_OFFSET:        404 [pixels]
  X_MAX:           1472 [pixels]
  Y_MAX:           1843 [pixels]
  DET_THRESH:      6
  PHOTO_THRESH:    2
  SL_URL:          sw01030629000msufc0296.fits
  SUN_POSTN:       319.33d {+21h 17m 20s}  -15.77d {-15d 46' 28"}
  SUN_DIST:         75.93 [deg]   Sun_angle= -1.9 [hr] (East of Sun)
  MOON_POSTN:      234.60d {+15h 38m 25s}  -17.53d {-17d 31' 35"}
  MOON_DIST:       117.11 [deg]
  MOON_ILLUM:      42 [%]
  GAL_COORDS:      109.01, -3.79 [deg] galactic lon,lat of the pointing direction
  ECL_COORDS:       21.96, 54.29 [deg] ecliptic lon,lat of the pointing direction
  COMMENTS:        SWIFT-UVOT Source List.  
  COMMENTS:        The Pointing RA,Dec,Roll values came from the 1st SrcList Notice.  
  

• GCN NOTICE
  

  TITLE:           GCN/SWIFT NOTICE
  NOTICE_DATE:     Fri 05 Feb 21 11:19:24 UT
  NOTICE_TYPE:     Swift-UVOT Processed Image
  TRIGGER_NUM:     1030629,   Seg_Num: 0
  POINT_RA:        347.224d {+23h 08m 54s} (J2000)
  POINT_DEC:       +56.289d {+56d 17' 19"} (J2000)
  ROLL:            207.699d
  IMG_START_DATE:  19250 TJD;    36 DOY;   21/02/05
  IMG_START_TIME:  40415.81 SOD {11:13:35.81} UT,   138.2 [sec] since BAT Trigger Time
  FILTER:          10, White
  EXPOSURE_ID:     634216442
  X_OFFSET:        592 [pixels]
  Y_OFFSET:        963 [pixels]
  WIDTH:           160 [pixels]
  HEIGHT:          160 [pixels]
  X_GRB_POS:       752
  Y_GRB_POS:       1123
  BINNING_INDEX:   1
  IM_URL:          sw01030629000msuni0165.fits
  SUN_POSTN:       319.33d {+21h 17m 20s}  -15.77d {-15d 46' 28"}
  SUN_DIST:         75.93 [deg]   Sun_angle= -1.9 [hr] (East of Sun)
  MOON_POSTN:      234.60d {+15h 38m 24s}  -17.53d {-17d 31' 32"}
  MOON_DIST:       117.12 [deg]
  MOON_ILLUM:      42 [%]
  GAL_COORDS:      109.01, -3.79 [deg] galactic lon,lat of the pointing direction
  ECL_COORDS:       21.96, 54.29 [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:     Fri 05 Feb 21 11:19:58 UT
  NOTICE_TYPE:     Swift-UVOT Processed Source List
  TRIGGER_NUM:     1030629,   Seg_Num: 0
  POINT_RA:        347.224d {+23h 08m 54s} (J2000)
  POINT_DEC:       +56.289d {+56d 17' 19"} (J2000)
  POINT_ROLL:      207.699d
  IMG_START_DATE:  19250 TJD;    36 DOY;   21/02/05
  IMG_START_TIME:  40573.75 SOD {11:16:13.75} UT,   296.1 [sec] since BAT Trigger Time
  FILTER:          7, U
  BKG_MEAN:        0.378
  N_STARS:         186
  X_OFFSET:        33 [pixels]
  Y_OFFSET:        404 [pixels]
  X_MAX:           1472 [pixels]
  Y_MAX:           1843 [pixels]
  DET_THRESH:      6
  PHOTO_THRESH:    2
  SL_URL:          sw01030629000msufc0296.fits
  SUN_POSTN:       319.33d {+21h 17m 20s}  -15.77d {-15d 46' 28"}
  SUN_DIST:         75.92 [deg]   Sun_angle= -1.9 [hr] (East of Sun)
  MOON_POSTN:      234.61d {+15h 38m 25s}  -17.53d {-17d 31' 39"}
  MOON_DIST:       117.11 [deg]
  MOON_ILLUM:      42 [%]
  GAL_COORDS:      109.01, -3.79 [deg] galactic lon,lat of the pointing direction
  ECL_COORDS:       21.96, 54.29 [deg] ecliptic lon,lat of the pointing direction
  COMMENTS:        SWIFT-UVOT Processed Source List.  
  COMMENTS:        All 4 attachments are included.  
  

  
• GCN Circular #29397
  S. Dichiara (NASA/GSFC/UMCP), E. Ambrosi (INAF-IASFPA), S. D. Barthelmy (GSFC), V. D'Elia (SSDC), P. A. Evans (U Leicester), J.D. Gropp (PSU), H. A. Krimm (NSF), N. P. M. Kuin (UCL-MSSL), A. Y. Lien (GSFC/UMBC) and K. L. Page (U Leicester) report on behalf of the Neil Gehrels Swift Observatory Team:
  At 11:11:17 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 210205A (trigger=1030629). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 347.257, +56.312 which is

     RA(J2000)  =  23h 09m 02s
     Dec(J2000) = +56d 18' 45"
  

  with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve shows a multi-peak structure with a duration of about 35 sec. The peak count rate was ~1000 counts/sec (15-350 keV), at ~2 sec after the trigger.
  The XRT began observing the field at 11:13:32.2 UT, 134.7 seconds after the BAT trigger. Using promptly downlinked data we find an uncatalogued X-ray source with an enhanced position: RA, Dec 347.2214, 56.2943 which is equivalent to:

     RA(J2000)  = 23h 08m 53.13s
     Dec(J2000) = +56d 17' 39.4"
  

  with an uncertainty of 2.6 arcseconds (radius, 90% containment). This location is 95 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 5.15 x 10^21 cm^-2 (Willingale et al. 2013).
  UVOT took a finding chart exposure of 150 seconds with the White filter starting 138 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 47% 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 large, but uncertain, extinction expected.
  Burst Advocate for this burst is S. Dichiara (dichiara AT umd.edu). 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:     Fri 05 Feb 21 11:20:58 UT
  NOTICE_TYPE:     Swift-UVOT Image
  TRIGGER_NUM:     1030629,   Seg_Num: 0
  POINT_RA:        347.224d {+23h 08m 54s} (J2000)
  POINT_DEC:       +56.289d {+56d 17' 19"} (J2000)
  ROLL:            207.699d
  IMG_START_DATE:  19250 TJD;    36 DOY;   21/02/05
  IMG_START_TIME:  40573.75 SOD {11:16:13.75} UT,   296.1 [sec] since BAT Trigger Time
  FILTER:          7, U
  EXPOSURE_ID:     634216600
  X_OFFSET:        592 [pixels]
  Y_OFFSET:        963 [pixels]
  WIDTH:           160 [pixels]
  HEIGHT:          160 [pixels]
  X_GRB_POS:       752
  Y_GRB_POS:       1123
  BINNING_INDEX:   1
  IM_URL:          sw01030629000msuni0323.fits
  SUN_POSTN:       319.33d {+21h 17m 20s}  -15.77d {-15d 46' 27"}
  SUN_DIST:         75.92 [deg]   Sun_angle= -1.9 [hr] (East of Sun)
  MOON_POSTN:      234.62d {+15h 38m 28s}  -17.53d {-17d 31' 50"}
  MOON_DIST:       117.11 [deg]
  MOON_ILLUM:      42 [%]
  GAL_COORDS:      109.01, -3.79 [deg] galactic lon,lat of the pointing direction
  ECL_COORDS:       21.96, 54.29 [deg] ecliptic lon,lat of the pointing direction
  COMMENTS:        SWIFT-UVOT Image.  
  COMMENTS:        The Pointing RA,Dec,Roll values came from the 1st Image Notice.  
  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:     Fri 05 Feb 21 11:21:03 UT
  NOTICE_TYPE:     Swift-UVOT Processed Image
  TRIGGER_NUM:     1030629,   Seg_Num: 0
  POINT_RA:        347.224d {+23h 08m 54s} (J2000)
  POINT_DEC:       +56.289d {+56d 17' 19"} (J2000)
  ROLL:            207.699d
  IMG_START_DATE:  19250 TJD;    36 DOY;   21/02/05
  IMG_START_TIME:  40573.75 SOD {11:16:13.75} UT,   296.1 [sec] since BAT Trigger Time
  FILTER:          7, U
  EXPOSURE_ID:     634216600
  X_OFFSET:        592 [pixels]
  Y_OFFSET:        963 [pixels]
  WIDTH:           160 [pixels]
  HEIGHT:          160 [pixels]
  X_GRB_POS:       752
  Y_GRB_POS:       1123
  BINNING_INDEX:   1
  IM_URL:          sw01030629000msuni0323.fits
  SUN_POSTN:       319.33d {+21h 17m 20s}  -15.77d {-15d 46' 27"}
  SUN_DIST:         75.92 [deg]   Sun_angle= -1.9 [hr] (East of Sun)
  MOON_POSTN:      234.62d {+15h 38m 28s}  -17.53d {-17d 31' 51"}
  MOON_DIST:       117.11 [deg]
  MOON_ILLUM:      42 [%]
  GAL_COORDS:      109.01, -3.79 [deg] galactic lon,lat of the pointing direction
  ECL_COORDS:       21.96, 54.29 [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:     Fri 05 Feb 21 11:20:07 UT
  NOTICE_TYPE:     Swift-XRT Position UPDATE
  TRIGGER_NUM:     1030629,   Seg_Num: 0
  GRB_RA:          347.2214d {+23h 08m 53.13s} (J2000),
                   347.4530d {+23h 09m 48.73s} (current),
                   346.6747d {+23h 06m 41.91s} (1950)
  GRB_DEC:         +56.2942d {+56d 17' 39.1"} (J2000),
                   +56.4088d {+56d 24' 31.6"} (current),
                   +56.0230d {+56d 01' 22.7"} (1950)
  GRB_ERROR:       2.6 [arcsec radius, statistical plus systematic, 90% containment]
  GRB_INTEN:       1.00e-10 [erg/cm2/sec]
  GRB_SIGNIF:      10.00 [sigma]
  IMG_START_DATE:  19250 TJD;    36 DOY;   21/02/05
  IMG_START_TIME:  40420.00 SOD {11:13:40.00} UT,   142.4 [sec] since BAT Trigger Time
  TAM[0-3]:        100.00 100.00 100.00 100.00
  AMPLIFIER:       1
  WAVEFORM:        31
  SUN_POSTN:       319.33d {+21h 17m 20s}  -15.77d {-15d 46' 28"}
  SUN_DIST:         75.93 [deg]   Sun_angle= -1.9 [hr] (East of Sun)
  MOON_POSTN:      234.61d {+15h 38m 26s}  -17.53d {-17d 31' 40"}
  MOON_DIST:       117.11 [deg]
  MOON_ILLUM:      42 [%]
  GAL_COORDS:      109.01, -3.78 [deg] galactic lon,lat of the burst
  ECL_COORDS:       21.97, 54.30 [deg] ecliptic lon,lat of the burst
  COMMENTS:        SWIFT-XRT Coordinates.  
  COMMENTS:        This Notice was ground-generated -- not flight-generated.  
  COMMENTS:        This is an Update Notice -- the RA,Dec values herein supersede the previous XRT_POS Notice.  
  COMMENTS:        TAM values, flux and significance fields are not valid.  
  COMMENTS:        This position was automatically generated on the ground using  
  COMMENTS:        Photon Counting data telemetered via TDRSS (SPER data).  
  COMMENTS:        See http://www.swift.ac.uk/sper/docs.php for details.  
  COMMENTS:        This position was enhanced using UVOT field astrometry.  
  COMMENTS:        The probability that this is a serendipitous source in the  
  COMMENTS:        SPER window is 0.58% < P(seren) < 1.1%.  
  

• GCN Circular #29398
  L. P. Xin(NAOC), J. Wang(GXU), C. Gao(GXU), X. H. Han(NAOC), J. Y. Wei(NAOC), G. W. LI(NAOC), L. H. Li(NAOC), C. Wu(NAOC), X. G. Wang(GXU), E. W. Liang (GXU), R. S. Zhang(NAOC), Y. L. Qiu(NAOC), and J. S. Deng(NAOC) report:
  We began to observe GRB 210205A (Dichiaraet al., GCN 29397) with Xinglong GWAC-F60A telescope, China, at 11:13:26 (UT), 5th. Feb. 2021, about 129 sec after the burst.
  A series of R, I, and B band images were obtained. Preliminary analysis shows that no any new optical source are found in single images within the XRT errorbox (Dichiaraet al., GCN 29397).
  The 3 sigma upper limit is about 17.3 mag in R band at the mean time of 134 sec after the burst, calibrated to the USNO B1.0 catalog.
• GCN Circular #29399
  J.P. Osborne, A.P. Beardmore, P.A. Evans and M.R. Goad (U. Leicester) report on behalf of the Swift-XRT team.
  Using 1148 s of XRT Photon Counting mode data and 4 UVOT images for GRB 210205A, 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 = 347.21907, +56.29649 which is equivalent to:

  RA (J2000): 23h 08m 52.58s
  Dec (J2000): +56d 17' 47.4"
  

  with an uncertainty of 2.0 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 #29400
  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 210205A by Swift (Dichiara et al. GCNC 29397), 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 (Osborne et al. GCNC 29399) down to 18.3 mag in the co-added z-band images (7x120 s) starting at 12:22 UT. The non-detection is consistent with the limits reported by both Swift/UVOT (Dichiara et al. GCNC 29397) and GWAC-F60A (Xin et al. GCNC 29398).
  We thank the staff at Lijiang observatory for their excellent support.
• GCN Circular #29401
  S.Y. Fu (NAOC), Z.P. Zhu (HUST,NAOC), X. Liu, D. Xu (NAOC), X. Gao (Urumqi No.1 Senior High School), J.Z. Liu (XAO) report:
  We observed the field of GRB 210205A (Dichiara et al., GCN 29397) using the NEXT-0.6m telescope located at Nanshan, Xinjiang, China. We obtained 3x40 s, 4x60 s, 12x90 s frames in the Sloan r-band, starting at 12:09:46 UT on 2021-02-05, i.e., 58.5 min after the BAT trigger.
  No optical source is detected in our stacked image at the enhanced XRT position (Osborne et al., GCN 29399), down to a limiting magnitude of r~19.9, calibrated with the nearby PanSTARRS field.
• GCN Circular #29402
  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 210205A ( S. Dichiara et al., GCN 29397) errorbox 21040 sec after notice time and 21101 sec after trigger time at 2021-02-05 17:02:58 UT, with upper limit up to 17.4 mag. The observations began at zenith distance = 49 deg. The sun altitude is -22.7 deg.
  The galactic latitude b = -4 deg., longitude l = 109 deg.
  Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=1540460
  We obtain a following upper limits.

  Tmid-T0  |          Site       |Filt.| Expt. | Limit| Comment
  _________|_____________________|_____|_______|______|________
  
     21191 |      MASTER-Tavrida |   C |   180 | 14.5 |        
     21191 |      MASTER-Tavrida |   C |   180 | 14.8 |        
     22639 |      MASTER-Tavrida |   C |   180 | 17.4 |        
     22639 |      MASTER-Tavrida |   C |   180 | 17.1 |
  

  Filter C is a clear (unfiltred) band.
  The observation and reduction will continue. The message may be cited.
• GCN Circular #29403
  A. Belles (PSU) and S. Dichiara (NASA/GSFC/UMCP) report on behalf of the Swift/UVOT team:
  The Swift/UVOT began settled observations of the field of GRB 210205A 139 s after the BAT trigger (Dichiara et al., GCN Circ. 29397). No optical afterglow consistent with the XRT position (Osborne et al. GCN Circ. 29399) 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           139          289          147         >20.5
  white              139         4057          344         >20.6
  v                 4268         4468          197         >19.4
  b                 3652         5159          265         >20.1
  u                  297         5084          255         >19.7
  w1                4678         4878          197         >19.9
  m2                4473         4673          197         >20.8
  w2                4063         4263          197         >19.3
  

  The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.716 in the direction of the burst (Schlegel et al. 1998).
• GCN Circular #29406
  Takashi Horiuchi, Hidekazu Hanayama (NAOJ), Katsuhiro L. Murata, Yoichi Yatsu, Nobuyuki Kawai (Tokyo Tech) report on behalf of the MITSuME collaboration:
  We observed the field of GRB 210205A (Dichiara et al., GCN 29397) with the optical three color (g', Rc, and Ic) CCD cameras attached to the 105 cm Murikabushi telescope of Ishigakijima Astronomical Observatory, Okinawa, Japan.
  The observation with a series of 60 sec exposures started on 2021-02−05 11:22:29 UT (2 min after Swift BAT trigger). We stacked the 25 images and did not find any new point sources other than the USNO-B1.0 sources from the stacked images. We obtained the SN = 10 limits as follows.

  T0+[min] MID-UT T-EXP[sec] SN=10 limits
  ------------------------------------------------------------------------------------------------
  2 2021-02-05T11:36:37 1500 g' > 18.7, Rc > 19.0, Ic > 17.8
  ------------------------------------------------------------------------------------------------
  

• GCN Circular #29407
  P.A. Evans (U. Leicester), J.P. Osborne (U. Leicester), K.L. Page (U. Leicester), M.G. Bernardini (INAF-OAB), E. Ambrosi (INAF-IASFPA) , M. Capalbi (INAF-IASFPA), J.A. Kennea (PSU), A. Tohuvavohu (U. Toronto), B. Sbarufatti (PSU) and S. Dichiara report on behalf of the Swift-XRT team:
  We have analysed 6.1 ks of XRT data for GRB 210205A (Dichiara et al. GCN Circ. 29397), from 143 s to 28.3 ks after the BAT trigger. The data are entirely in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Osborne et al. (GCN Circ. 29399).
  The light curve can be modelled with a power-law decay with a decay index of alpha=1.10 (+0.10, -0.11).
  A spectrum formed from the PC mode data can be fitted with an absorbed power-law with a photon spectral index of 2.1 (+0.5, -0.4). The best-fitting absorption column is 8.0 (+4.0, -2.8) x 10^21 cm^-2, consistent with the Galactic value of 5.1 x 10^21 cm^-2 (Willingale et al. 2013). The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 4.3 x 10^-11 (8.2 x 10^-11) erg cm^-2 count^-1.
  A summary of the PC-mode spectrum is thus:

  Total column:	     8.0 (+4.0, -2.8) x 10^21 cm^-2
  Galactic foreground: 5.1 x 10^21 cm^-2
  Excess significance: <1.6 sigma
  Photon index:	     2.1 (+0.5, -0.4)
  

  If the light curve continues to decay with a power-law decay index of 1.10, the count rate at T+24 hours will be 1.6 x 10^-3 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 6.8 x 10^-14 (1.3 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/01030629.
  This circular is an official product of the Swift-XRT team.
• GCN Circular #29409
  S. D. Barthelmy (GSFC), J. R. Cummings (CPI), S. Dichiara (NASA/GSFC/UMCP), 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), T. N. Ukwatta (LANL) (i.e. the Swift-BAT team):
  Using the data set from T-239 to T+963 sec from the recent telemetry downlink, we report further analysis of BAT GRB 210205A (trigger #1030629) (Dichiara et al., GCN Circ. 29397). The BAT ground-calculated position is RA, Dec = 347.264, 56.311 deg which is

     RA(J2000)  =  23h 09m 03.3s
     Dec(J2000) = +56d 18' 41.2"
  

  with an uncertainty of 2.1 arcmin, (radius, sys+stat, 90% containment). The partial coding was 18%.
  The mask-weighted light curve shows a multi-peaked structure that starts at ~ T-7 s and ends at ~T+20 s. The main peak in the structure occurs at ~T+6 s. T90 (15-350 keV) is 22.70 +- 4.18 sec (estimated error including systematics).
  The time-averaged spectrum from T-7.35 to T+20.07 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 2.27 +- 0.31. The fluence in the 15-150 keV band is 8.7 +- 1.6 x 10^-7 erg/cm2. The 1-sec peak photon flux measured from T+5.98 sec in the 15-150 keV band is 1.6 +- 0.5 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/1030629/BA/
• GCN Circular #29526
  S. B. Pandey, R. Gupta, A. Kumar, Dimple, A. Ghosh, A. Aryan, and K. Misra (ARIES) on behalf of a larger collaboration report:
  GRB 210205A was detected by the Swift Burst Alert Telescope (BAT) at 11:11:17 UT on 5th Feb 2021 (GCN 29397). The prompt emission mask-weighted BAT light curve consists of a multi-peaked structure with a T90 duration of 22.70 +- 4.18 sec in 15-350 keV energy range (GCN 29409). We compare the reported value of BAT fluence and peak photon flux for this GRB (GCN 29409) with all the BAT detected samples, we find this burst is positioned nearly the middle of this distribution. The Swift XRT detected an X-ray afterglow ~ 134.7 sec after the BAT trigger (GCN 29397). The X-ray light curve could be best described with a simple power-law model with a temporal index of 1.100 (+0.092, -0.101) and the afterglow is fainter (0.016 x 10^-11 erg/cm2/s, at 11-hour post burst) than typical X-ray afterglows. As no red-shift has been reported for this source, we modeled the time-averaged XRT spectrum (T0 + 143 to 39716 s) considering red-shift = 2, roughly average red-shift value for long GRBs. The spectrum could be modeled using an absorption power-law with following spectral parameters: NH_host= 5.34 (-4.58,+6.18) * 10^{22} cm^{-2} and \beta_x= 1.11 (-0.37,+0.40). Considering the adiabatic deceleration without energy injection, closure relations indicate that the X-ray afterglow could be best described with \nu > \nu_c spectral regime for ISM as well as WIND medium for the electron energy index p ~ 2.22.
  Many optical telescopes searched for the optical afterglow but no counterpart associated with this burst was detected to deeper limits at early epochs(GCN 29397, 29398, 29400, 29401, 29402, 29403, and 29406). So, we performed the search for the optical counterpart of this XRT localized GRB 210205A (GCN 29399) using the 4Kx4K CCD Imager (Pandey et al. 2017, arXiv:1711.05422v1) mounted at the axial port of the 3.6m Devasthal Optical Telescope (DOT) of ARIES Nainital. Multiple frames having exposure times of 300s each were taken in R and I filters. We do not find any evidence of an afterglow candidate inside the XRT error circle, consistent with other non-detections. We constrain the following 3-sigma upper limits.

  T-T0 (days) Exp. (s) Filter  OT   UL   Telescope
  
  1.0921       2*300   R       NA   22.8     3.6m DOT
  1.1033       2*300   I       NA   22.6     3.6m DOT
  

  The limiting magnitudes quoted are not corrected for the Galactic and Host extinction in the direction of the burst. Considering no spectral break between X-ray and optical frequencies, we extrapolated the X-ray spectral index towards optical frequencies. We found that using reported limiting values at optical (Galactic extinction corrected) roughly lie below the extrapolated X-ray power-law slope, suggesting that this burst could be a potential dark GRB candidate either highly extinguished or as a high redshift event.
  3.6m Devasthal Optical Telescope (DOT) is a recently commissioned facility in the Northern Himalayan region of India (long:79 41 04E, lat:29 21 40N, alt:2540m) owned and operated by the Aryabhatta Research Institute of Observational Sciences (ARIES), Nainital (https://www.aries.res.in). Authors of this GCN circular thankfully acknowledge consistent support from the staff members to run and maintain the 3.6m DOT. This circular may be cited.