Gamma-ray Burst 200125A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

• none

• GCN/BACODINE POSITION NOTICE
  

  TITLE:           GCN/SWIFT NOTICE
  NOTICE_DATE:     Sat 25 Jan 20 11:32:35 UT
  NOTICE_TYPE:     Swift-BAT GRB Position
  TRIGGER_NUM:     952164,   Seg_Num: 0
  GRB_RA:          228.047d {+15h 12m 11s} (J2000),
                   228.316d {+15h 13m 16s} (current),
                   227.377d {+15h 09m 30s} (1950)
  GRB_DEC:          -8.148d {-08d 08' 53"} (J2000),
                    -8.223d {-08d 13' 21"} (current),
                    -7.961d {-07d 57' 39"} (1950)
  GRB_ERROR:       3.00 [arcmin radius, statistical only]
  GRB_INTEN:       47294 [cnts]    Image_Peak=543 [image_cnts]
  TRIGGER_DUR:     8.192 [sec] 
  TRIGGER_INDEX:   454     E_range: 15-50 keV
  BKG_INTEN:       356554 [cnts]
  BKG_TIME:        41407.67 SOD {11:30:07.67} UT
  BKG_DUR:         64 [sec]
  GRB_DATE:        18873 TJD;    25 DOY;   20/01/25
  GRB_TIME:        41499.19 SOD {11:31:39.19} UT
  GRB_PHI:         102.34 [deg]
  GRB_THETA:        28.97 [deg]
  SOLN_STATUS:     0x3
  RATE_SIGNIF:     12.20 [sigma]
  IMAGE_SIGNIF:    7.97 [sigma]
  MERIT_PARAMS:     +1  +0  +0  +3  +1  -2  +0  +0 -21  +0 
  SUN_POSTN:       307.30d {+20h 29m 12s}  -19.03d {-19d 01' 32"}
  SUN_DIST:         76.97 [deg]   Sun_angle= 5.3 [hr] (West of Sun)
  MOON_POSTN:      314.78d {+20h 59m 08s}  -20.18d {-20d 10' 37"}
  MOON_DIST:        83.88 [deg]
  MOON_ILLUM:      0 [%]
  GAL_COORDS:      351.98, 40.95 [deg] galactic lon,lat of the burst (or transient)
  ECL_COORDS:      227.88,  9.37 [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 = 352.53,-8.22 [deg].  
  

• red DSS finding chart ps-file
  
  
• GCN NOTICE
  

  TITLE:           GCN/SWIFT NOTICE
  NOTICE_DATE:     Sat 25 Jan 20 11:34:00 UT
  NOTICE_TYPE:     Swift-XRT Position
  TRIGGER_NUM:     952164,   Seg_Num: 0
  GRB_RA:          228.0471d {+15h 12m 11.30s} (J2000),
                   228.3162d {+15h 13m 15.88s} (current),
                   227.3775d {+15h 09m 30.58s} (1950)
  GRB_DEC:          -8.1436d {-08d 08' 36.9"} (J2000),
                    -8.2181d {-08d 13' 05.1"} (current),
                    -7.9563d {-07d 57' 22.5"} (1950)
  GRB_ERROR:       4.9 [arcsec radius, statistical plus systematic, 90% containment]
  GRB_INTEN:       3.86e-09 [erg/cm2/sec]
  GRB_SIGNIF:      10.86 [sigma]
  IMG_START_DATE:  18873 TJD;    25 DOY;   20/01/25
  IMG_START_TIME:  41610.75 SOD {11:33:30.75} UT,   111.6 [sec] since BAT Trigger Time
  TAM[0-3]:        327.66 237.18 261.65 243.47
  AMPLIFIER:       2
  WAVEFORM:        134
  SUN_POSTN:       307.30d {+20h 29m 12s}  -19.03d {-19d 01' 31"}
  SUN_DIST:         76.97 [deg]   Sun_angle= 5.3 [hr] (West of Sun)
  MOON_POSTN:      314.80d {+20h 59m 11s}  -20.17d {-20d 10' 28"}
  MOON_DIST:        83.90 [deg]
  MOON_ILLUM:      0 [%]
  GAL_COORDS:      351.98, 40.95 [deg] galactic lon,lat of the burst
  ECL_COORDS:      227.88,  9.37 [deg] ecliptic lon,lat of the burst
  COMMENTS:        SWIFT-XRT Coordinates.  
  COMMENTS:        The XRT position is 0.29 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:     Sat 25 Jan 20 11:34:19 UT
  NOTICE_TYPE:     Swift-XRT Processed Image
  TRIGGER_NUM:     952164,   Seg_Num: 0
  GRB_RA:          228.0471d {+15h 12m 11.3s} (J2000),
                   228.3162d {+15h 13m 15.8s} (current),
                   227.3775d {+15h 09m 30.5s} (1950)
  GRB_DEC:          -8.1436d {-08d 08' 36.9"} (J2000),
                    -8.2181d {-08d 13' 05.1"} (current),
                    -7.9563d {-07d 57' 22.5"} (1950)
  GRB_ERROR:       4.7 [arcsec, radius, statistical plus systematic]
  GRB_INTEN:       118 [cnts]
  IMG_START_DATE:  18873 TJD;    25 DOY;   20/01/25
  IMG_START_TIME:  41610.75 SOD {11:33:30.75} UT,   111.6 [sec] since BAT Trigger Time
  CENTROID_X:      349.38,  raw= 349  [pixels]
  CENTROID_Y:      296.71,  raw= 297  [pixels]
  ROLL:            107.78 [deg]
  GAIN:            2
  MODE:            3, Long Image mode
  WAVEFORM:        134
  EXPO_TIME:       2.50 [sec]
  GRB_POS_XRT_Y:   -3.26
  GRB_POS_XRT_Z:   98.96
  IMAGE_URL:       sw00952164000msxps_rw.img
  SUN_POSTN:       307.30d {+20h 29m 12s}  -19.03d {-19d 01' 31"}
  SUN_DIST:         76.97 [deg]   Sun_angle= 5.3 [hr] (West of Sun)
  MOON_POSTN:      314.80d {+20h 59m 12s}  -20.17d {-20d 10' 26"}
  MOON_DIST:        83.90 [deg]
  MOON_ILLUM:      0 [%]
  GAL_COORDS:      351.98, 40.95 [deg] galactic lon,lat of the burst
  ECL_COORDS:      227.88,  9.37 [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:     Wed 22 Jan 20 02:04:10 UT
  NOTICE_TYPE:     Swift-UVOT Processed Source List
  TRIGGER_NUM:     950330,   Seg_Num: 0
  POINT_RA:        209.970d {+13h 59m 53s} (J2000)
  POINT_DEC:       +27.574d {+27d 34' 28"} (J2000)
  POINT_ROLL:      106.170d
  IMG_START_DATE:  18870 TJD;    22 DOY;   20/01/22
  IMG_START_TIME:  6354.28 SOD {01:45:54.28} UT,   293.9 [sec] since BAT Trigger Time
  FILTER:          7, U
  BKG_MEAN:        0.484
  N_STARS:         13
  X_OFFSET:        805 [pixels]
  Y_OFFSET:        474 [pixels]
  X_MAX:           1764 [pixels]
  Y_MAX:           1433 [pixels]
  DET_THRESH:      6
  PHOTO_THRESH:    3
  SL_URL:          sw00950330000msufc0293.fits
  SUN_POSTN:       303.74d {+20h 14m 57s}  -19.82d {-19d 49' 25"}
  SUN_DIST:        102.00 [deg]   Sun_angle= 6.2 [hr] (West of Sun)
  MOON_POSTN:      268.21d {+17h 52m 51s}  -22.58d {-22d 35' 02"}
  MOON_DIST:        75.12 [deg]
  MOON_ILLUM:      8 [%]
  GAL_COORDS:       38.55, 74.81 [deg] galactic lon,lat of the pointing direction
  ECL_COORDS:      196.13, 36.93 [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:     Sat 25 Jan 20 11:35:50 UT
  NOTICE_TYPE:     Swift-BAT GRB Lightcurve
  TRIGGER_NUM:     952164,   Seg_Num: 0
  GRB_RA:          228.047d {+15h 12m 11s} (J2000),
                   228.316d {+15h 13m 16s} (current),
                   227.377d {+15h 09m 30s} (1950)
  GRB_DEC:          -8.148d {-08d 08' 53"} (J2000),
                    -8.223d {-08d 13' 21"} (current),
                    -7.961d {-07d 57' 39"} (1950)
  GRB_DATE:        18873 TJD;    25 DOY;   20/01/25
  GRB_TIME:        41499.19 SOD {11:31:39.19} UT
  TRIGGER_INDEX:   454
  GRB_PHI:         102.34 [deg]
  GRB_THETA:        28.97 [deg]
  DELTA_TIME:      -31.00 [sec]
  TRIGGER_DUR:     8.192 [sec] 
  SOLN_STATUS:     0x3
  RATE_SIGNIF:     12.20 [sigma]
  IMAGE_SIGNIF:    7.97 [sigma]
  LC_URL:          sw00952164000msb.lc
  SUN_POSTN:       307.30d {+20h 29m 12s}  -19.03d {-19d 01' 30"}
  SUN_DIST:         76.97 [deg]   Sun_angle= 5.3 [hr] (West of Sun)
  MOON_POSTN:      314.81d {+20h 59m 15s}  -20.17d {-20d 10' 16"}
  MOON_DIST:        83.91 [deg]
  MOON_ILLUM:      0 [%]
  GAL_COORDS:      351.98, 40.95 [deg] galactic lon,lat of the burst (or transient)
  ECL_COORDS:      227.88,  9.37 [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 = 352.53,-8.22 [deg].  
  

  
• GCN Circular #26876
  A. Y. Lien (GSFC/UMBC), C. Gronwall (PSU), J.D. Gropp (PSU), F. E. Marshall (NASA/GSFC), K. L. Page (U Leicester), K. K. Simpson (PSU), A. Tohuvavohu (U Toronto) and E. Troja (NASA/GSFC/UMCP) report on behalf of the Neil Gehrels Swift Observatory Team:
  At 11:31:39 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 200125A (trigger=952164). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 228.047, -8.148 which is

     RA(J2000) = 15h 12m 11s
     Dec(J2000) = -08d 08' 53"
  

  with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a complex structure with a duration of at least 40 sec. The peak count rate was ~1000 counts/sec (15-350 keV), at ~5 sec after the trigger.
  The XRT began observing the field at 11:33:30.7 UT, 111.5 seconds after the BAT trigger. XRT found a bright, uncatalogued X-ray source located at RA, Dec 228.0471, -8.1436 which is equivalent to:

     RA(J2000)  = 15h 12m 11.30s
     Dec(J2000) = -08d 08' 37.0"
  

  with an uncertainty of 4.9 arcseconds (radius, 90% containment). This location is 15 arcseconds from the BAT onboard position, within the BAT error circle. No event data are yet available to determine the column density using X-ray spectroscopy.
  The initial flux in the 2.5 s image was 3.86e-09 erg cm^-2 s^-1 (0.2-10 keV).
  There are no UVOT data available at this time.
  Burst Advocate for this burst is A. Y. Lien (amy.y.lien AT nasa.gov). Please contact the BA by email if you require additional information regarding Swift followup of this burst. In extremely urgent cases, after trying the Burst Advocate, you can contact the Swift PI by phone (see Swift TOO web site for information: http://www.swift.psu.edu/)
• GCN NOTICE
  

  TITLE:           GCN/SWIFT NOTICE
  NOTICE_DATE:     Sat 25 Jan 20 11:55:36 UT
  NOTICE_TYPE:     Swift-UVOT Source List
  TRIGGER_NUM:     952164,   Seg_Num: 0
  POINT_RA:        228.076d {+15h 12m 18s} (J2000)
  POINT_DEC:        -8.152d {-08d 09' 08"} (J2000)
  POINT_ROLL:      107.781d
  IMG_START_DATE:  18873 TJD;    25 DOY;   20/01/25
  IMG_START_TIME:  41678.32 SOD {11:34:38.32} UT,   179.1 [sec] since BAT Trigger Time
  FILTER:          10, White
  BKG_MEAN:        8.096
  N_STARS:         33
  X_OFFSET:        316 [pixels]
  Y_OFFSET:        687 [pixels]
  X_MAX:           1275 [pixels]
  Y_MAX:           1646 [pixels]
  DET_THRESH:      25
  PHOTO_THRESH:    15
  SL_URL:          sw00952164000msufc0179.fits
  SUN_POSTN:       307.32d {+20h 29m 16s}  -19.02d {-19d 01' 18"}
  SUN_DIST:         76.96 [deg]   Sun_angle= 5.3 [hr] (West of Sun)
  MOON_POSTN:      314.99d {+20h 59m 58s}  -20.14d {-20d 08' 08"}
  MOON_DIST:        84.05 [deg]
  MOON_ILLUM:      0 [%]
  GAL_COORDS:      352.00, 40.93 [deg] galactic lon,lat of the pointing direction
  ECL_COORDS:      227.91,  9.37 [deg] ecliptic lon,lat of the pointing direction
  COMMENTS:        SWIFT-UVOT Source List.  
  

• GCN NOTICE
  

  TITLE:           GCN/SWIFT NOTICE
  NOTICE_DATE:     Wed 22 Jan 20 02:06:38 UT
  NOTICE_TYPE:     Swift-UVOT Image
  TRIGGER_NUM:     950330,   Seg_Num: 0
  POINT_RA:        209.970d {+13h 59m 53s} (J2000)
  POINT_DEC:       +27.575d {+27d 34' 29"} (J2000)
  ROLL:            106.171d
  IMG_START_DATE:  18870 TJD;    22 DOY;   20/01/22
  IMG_START_TIME:  6934.49 SOD {01:55:34.49} UT,   874.1 [sec] since BAT Trigger Time
  FILTER:          10, White
  EXPOSURE_ID:     601350958
  X_OFFSET:        1124 [pixels]
  Y_OFFSET:        793 [pixels]
  WIDTH:           160 [pixels]
  HEIGHT:          160 [pixels]
  X_GRB_POS:       1284
  Y_GRB_POS:       953
  BINNING_INDEX:   1
  IM_URL:          sw00950330000msuni0899.fits
  SUN_POSTN:       303.74d {+20h 14m 57s}  -19.82d {-19d 49' 23"}
  SUN_DIST:        102.01 [deg]   Sun_angle= 6.2 [hr] (West of Sun)
  MOON_POSTN:      268.24d {+17h 52m 57s}  -22.59d {-22d 35' 10"}
  MOON_DIST:        75.14 [deg]
  MOON_ILLUM:      8 [%]
  GAL_COORDS:       38.56, 74.81 [deg] galactic lon,lat of the pointing direction
  ECL_COORDS:      196.13, 36.93 [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:     Sat 25 Jan 20 11:34:16 UT
  NOTICE_TYPE:     Swift-XRT Image
  TRIGGER_NUM:     952164,   Seg_Num: 0
  GRB_RA:          228.0471d {+15h 12m 11.3s} (J2000),
                   228.3162d {+15h 13m 15.8s} (current),
                   227.3775d {+15h 09m 30.5s} (1950)
  GRB_DEC:          -8.1436d {-08d 08' 36.9"} (J2000),
                    -8.2181d {-08d 13' 05.1"} (current),
                    -7.9563d {-07d 57' 22.5"} (1950)
  GRB_ERROR:       4.7 [arcsec, radius, statistical plus systematic]
  GRB_INTEN:       118 [cnts]
  IMG_START_DATE:  18873 TJD;    25 DOY;   20/01/25
  IMG_START_TIME:  41610.75 SOD {11:33:30.75} UT,   111.6 [sec] since BAT Trigger Time
  CENTROID_X:      349.38,  raw= 349  [pixels]
  CENTROID_Y:      296.71,  raw= 297  [pixels]
  ROLL:            107.78 [deg]
  GAIN:            2
  MODE:            3, Long Image mode
  WAVEFORM:        134
  EXPO_TIME:       2.50 [sec]
  GRB_POS_XRT_Y:   -3.26
  GRB_POS_XRT_Z:   98.96
  IMAGE_URL:       sw00952164000msxps_rw.img
  SUN_POSTN:       307.30d {+20h 29m 12s}  -19.03d {-19d 01' 31"}
  SUN_DIST:         76.97 [deg]   Sun_angle= 5.3 [hr] (West of Sun)
  MOON_POSTN:      314.80d {+20h 59m 12s}  -20.17d {-20d 10' 27"}
  MOON_DIST:        83.90 [deg]
  MOON_ILLUM:      0 [%]
  GAL_COORDS:      351.98, 40.95 [deg] galactic lon,lat of the burst
  ECL_COORDS:      227.88,  9.37 [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:     Sat 25 Jan 20 11:55:45 UT
  NOTICE_TYPE:     Swift-UVOT Processed Source List
  TRIGGER_NUM:     952164,   Seg_Num: 0
  POINT_RA:        228.076d {+15h 12m 18s} (J2000)
  POINT_DEC:        -8.152d {-08d 09' 08"} (J2000)
  POINT_ROLL:      107.781d
  IMG_START_DATE:  18873 TJD;    25 DOY;   20/01/25
  IMG_START_TIME:  41678.32 SOD {11:34:38.32} UT,   179.1 [sec] since BAT Trigger Time
  FILTER:          10, White
  BKG_MEAN:        8.096
  N_STARS:         33
  X_OFFSET:        316 [pixels]
  Y_OFFSET:        687 [pixels]
  X_MAX:           1275 [pixels]
  Y_MAX:           1646 [pixels]
  DET_THRESH:      25
  PHOTO_THRESH:    15
  SL_URL:          sw00952164000msufc0179.fits
  SUN_POSTN:       307.32d {+20h 29m 16s}  -19.02d {-19d 01' 18"}
  SUN_DIST:         76.96 [deg]   Sun_angle= 5.3 [hr] (West of Sun)
  MOON_POSTN:      314.99d {+20h 59m 58s}  -20.14d {-20d 08' 07"}
  MOON_DIST:        84.05 [deg]
  MOON_ILLUM:      0 [%]
  GAL_COORDS:      352.00, 40.93 [deg] galactic lon,lat of the pointing direction
  ECL_COORDS:      227.91,  9.37 [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:     Sat 25 Jan 20 11:57:15 UT
  NOTICE_TYPE:     Swift-UVOT Image
  TRIGGER_NUM:     952164,   Seg_Num: 0
  POINT_RA:        228.076d {+15h 12m 18s} (J2000)
  POINT_DEC:        -8.152d {-08d 09' 08"} (J2000)
  ROLL:            107.781d
  IMG_START_DATE:  18873 TJD;    25 DOY;   20/01/25
  IMG_START_TIME:  41678.32 SOD {11:34:38.32} UT,   179.1 [sec] since BAT Trigger Time
  FILTER:          10, White
  EXPOSURE_ID:     601644902
  X_OFFSET:        635 [pixels]
  Y_OFFSET:        1006 [pixels]
  WIDTH:           160 [pixels]
  HEIGHT:          160 [pixels]
  X_GRB_POS:       795
  Y_GRB_POS:       1166
  BINNING_INDEX:   1
  IM_URL:          sw00952164000msuni0204.fits
  SUN_POSTN:       307.32d {+20h 29m 16s}  -19.02d {-19d 01' 17"}
  SUN_DIST:         76.96 [deg]   Sun_angle= 5.3 [hr] (West of Sun)
  MOON_POSTN:      315.01d {+21h 00m 01s}  -20.13d {-20d 07' 58"}
  MOON_DIST:        84.07 [deg]
  MOON_ILLUM:      0 [%]
  GAL_COORDS:      352.00, 40.93 [deg] galactic lon,lat of the pointing direction
  ECL_COORDS:      227.91,  9.37 [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:     Sat 25 Jan 20 11:57:39 UT
  NOTICE_TYPE:     Swift-UVOT Processed Source List
  TRIGGER_NUM:     952164,   Seg_Num: 0
  POINT_RA:        228.076d {+15h 12m 18s} (J2000)
  POINT_DEC:        -8.152d {-08d 09' 08"} (J2000)
  POINT_ROLL:      107.781d
  IMG_START_DATE:  18873 TJD;    25 DOY;   20/01/25
  IMG_START_TIME:  41836.47 SOD {11:37:16.47} UT,   337.3 [sec] since BAT Trigger Time
  FILTER:          7, U
  BKG_MEAN:        1.271
  N_STARS:         26
  X_OFFSET:        76 [pixels]
  Y_OFFSET:        447 [pixels]
  X_MAX:           1515 [pixels]
  Y_MAX:           1886 [pixels]
  DET_THRESH:      10
  PHOTO_THRESH:    4
  SL_URL:          sw00952164000msufc0337.fits
  SUN_POSTN:       307.32d {+20h 29m 16s}  -19.02d {-19d 01' 17"}
  SUN_DIST:         76.96 [deg]   Sun_angle= 5.3 [hr] (West of Sun)
  MOON_POSTN:      315.01d {+21h 00m 02s}  -20.13d {-20d 07' 55"}
  MOON_DIST:        84.07 [deg]
  MOON_ILLUM:      0 [%]
  GAL_COORDS:      352.00, 40.93 [deg] galactic lon,lat of the pointing direction
  ECL_COORDS:      227.91,  9.37 [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:     Sat 25 Jan 20 11:57:32 UT
  NOTICE_TYPE:     Swift-UVOT Source List
  TRIGGER_NUM:     952164,   Seg_Num: 0
  POINT_RA:        228.076d {+15h 12m 18s} (J2000)
  POINT_DEC:        -8.152d {-08d 09' 08"} (J2000)
  POINT_ROLL:      107.781d
  IMG_START_DATE:  18873 TJD;    25 DOY;   20/01/25
  IMG_START_TIME:  41836.47 SOD {11:37:16.47} UT,   337.3 [sec] since BAT Trigger Time
  FILTER:          7, U
  BKG_MEAN:        1.271
  N_STARS:         26
  X_OFFSET:        76 [pixels]
  Y_OFFSET:        447 [pixels]
  X_MAX:           1515 [pixels]
  Y_MAX:           1886 [pixels]
  DET_THRESH:      10
  PHOTO_THRESH:    4
  SL_URL:          sw00952164000msufc0337.fits
  SUN_POSTN:       307.32d {+20h 29m 16s}  -19.02d {-19d 01' 17"}
  SUN_DIST:         76.96 [deg]   Sun_angle= 5.3 [hr] (West of Sun)
  MOON_POSTN:      315.01d {+21h 00m 02s}  -20.13d {-20d 07' 56"}
  MOON_DIST:        84.07 [deg]
  MOON_ILLUM:      0 [%]
  GAL_COORDS:      352.00, 40.93 [deg] galactic lon,lat of the pointing direction
  ECL_COORDS:      227.91,  9.37 [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:     Sat 25 Jan 20 11:59:20 UT
  NOTICE_TYPE:     Swift-UVOT Processed Image
  TRIGGER_NUM:     952164,   Seg_Num: 0
  POINT_RA:        228.076d {+15h 12m 18s} (J2000)
  POINT_DEC:        -8.152d {-08d 09' 08"} (J2000)
  ROLL:            107.781d
  IMG_START_DATE:  18873 TJD;    25 DOY;   20/01/25
  IMG_START_TIME:  41836.47 SOD {11:37:16.47} UT,   337.3 [sec] since BAT Trigger Time
  FILTER:          7, U
  EXPOSURE_ID:     601645060
  X_OFFSET:        635 [pixels]
  Y_OFFSET:        1006 [pixels]
  WIDTH:           160 [pixels]
  HEIGHT:          160 [pixels]
  X_GRB_POS:       795
  Y_GRB_POS:       1166
  BINNING_INDEX:   1
  IM_URL:          sw00952164000msuni0362.fits
  SUN_POSTN:       307.32d {+20h 29m 16s}  -19.02d {-19d 01' 16"}
  SUN_DIST:         76.96 [deg]   Sun_angle= 5.3 [hr] (West of Sun)
  MOON_POSTN:      315.02d {+21h 00m 06s}  -20.13d {-20d 07' 44"}
  MOON_DIST:        84.08 [deg]
  MOON_ILLUM:      0 [%]
  GAL_COORDS:      352.00, 40.93 [deg] galactic lon,lat of the pointing direction
  ECL_COORDS:      227.91,  9.37 [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:        If you have elected to receive attachments:  
  COMMENTS:        The uvot_catalog_image.fits.gz file does not exist; skipping the attachment.  
  

  
• GCN Circular #26878
  A.P. Beardmore, P.A. Evans, M.R. Goad and J.P. Osborne (U. Leicester) report on behalf of the Swift-XRT team.
  Using 1010 s of XRT Photon Counting mode data and 3 UVOT images for GRB 200125A, 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 = 228.04801, -8.14452 which is equivalent to:

  RA (J2000): 15h 12m 11.52s
  Dec (J2000): -08d 08' 40.3"
  

  with an uncertainty of 2.5 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 #26881
  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 GRB 200125A ( A. Y. Lien et al., GCN 26876) errorbox 47603 sec after trigger time at 2020-01-26 00:45:02 UT, with upper limit up to 18.5 mag. The observations began at zenith distance = 71 deg. The sun altitude is -32.2 deg.
  The galactic latitude b = 40 deg., longitude l = 352 deg.
  Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=1268985
  We obtain a following upper limits.

  Tmid-T0  |          Site       |Filt.| Expt. | Limit| Comment
  _________|_____________________|_____|_______|______|________
  
     47693 |         MASTER-SAAO |   C |   180 | 18.5 |        
  Filter C is a clear (unfiltred) band. 
  

  The observation and reduction will continue. The message may be cited.
• GCN Circular #26882
  Alan M. Watson (UNAM), Nat Butler (ASU), Alexander Kutyrev (GSFC), William H. Lee (UNAM), Michael G. Richer (UNAM), Ori Fox (STScI), J. Xavier Prochaska (UCSC), Josh Bloom (UCB), Antonino Cucchiara (UVI), Eleonora Troja (GSFC), Owen Littlejohns (ASU), Enrico Ramirez-Ruiz (UCSC), Jesús González (UNAM), Carlos Román-Zúñiga (UNAM), Harvey Moseley (GSFC), John Capone (UMD), V. Zach Golkhou (U. Wash.), and Vicki Toy (UMD) report:
  We observed the field of GRB 200125A (Lien et al., GCN Circ. 26876) with the Reionization and Transients Infrared Camera (RATIR; www.ratir.org) on the 1.5m Harold Johnson Telescope at the Observatorio Astronómico Nacional on Sierra San Pedro Mártir from 2020/01 25.48 to 2020/01 25.56 UTC (0.03 to 1.89 hours after the BAT trigger), obtaining a total of 1.40 hours exposure in the r and i bands.
  We detect a a source within the enhanced Swift-XRT error circle (Beardmore et al., GCN Circ. 26878). In comparison with the USNO-B1 and 2MASS catalogs, we obtain the following detections:

    r	= 21.02 +/- 0.05
    i	= 19.54 +/- 0.02
  

  These magnitudes are in the AB system and are not corrected for Galactic extinction in the direction of the GRB.
  We thank the staff of the Observatorio Astronómico Nacional in San Pedro Mártir.
• GCN Circular #26883
  X. Liu, D. Xu, Z.P. Zhu, B.Y. Yu, Y. Ma (NAOC), X. Gao (Urumqi No.1 Senior High School) report:
  We observed the field of GRB 200125A (Lien et al., GCN 26876) using the NEXT-0.6m telescope located at Nanshan, Xinjiang, China. Observations started at 23:06:52 UT on 2020-01-25 (i.e., 11.59 h after the BAT trigger), and 10x300 s Sloan r-band frames were obtained.
  No optical afterglow is detected within the enhanced Swift-XRT error circle (Beardmore et al., GCN Circ. 26878) in our stacked image, down to a limiting magnitude of r ~ 21.0, calibrated with the nearby PanSTARRS field.
• GCN Circular #26884
  A. Tohuvavohu (U. Toronto), J.A. Kennea (PSU), J.P. Osborne (U. Leicester), K.L. Page (U. Leicester), A.P. Beardmore (U. Leicester), A. Melandri (INAF-OAB), P. D'Avanzo (INAF-OAB), M.G. Bernardini (INAF-OAB), B. Sbarufatti (PSU) and A.Y. Lien report on behalf of the Swift-XRT team:
  We have analysed 5.7 ks of XRT data for GRB 200125A (Lien et al. GCN Circ. 26876), from 127 s to 28.1 ks after the BAT trigger. The data comprise 286 s in Windowed Timing (WT) mode with the remainder in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Beardmore et al. (GCN Circ. 26878). a rise, withpower-law index .
  A spectrum formed from the WT mode data can be fitted with an absorbed power-law with a photon spectral index of 1.523 (+/-0.029). The best-fitting absorption column is 3.05 (+0.17, -0.16) x 10^21 cm^-2, in excess of the Galactic value of 7.7 x 10^20 cm^-2 (Willingale et al. 2013). The PC mode spectrum has a photon index of 2.17 (+0.19, -0.18) and a best-fitting absorption column of 1.3 (+0.5, -0.4) x 10^21 cm^-2. The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 3.1 x 10^-11 (4.2 x 10^-11) erg cm^-2 count^-1.
  A summary of the PC-mode spectrum is thus:

  Total column:	     1.3 (+0.5, -0.4) x 10^21 cm^-2
  Galactic foreground: 7.7 x 10^20 cm^-2
  Excess significance: 2.0 sigma
  Photon index:	     2.17 (+0.19, -0.18)
  

  The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00952164.
  This circular is an official product of the Swift-XRT team.
• GCN Circular #26885
  K.L. Page reports on behalf of the Swift-XRT team:
  The automated Swift-XRT refined analysis circular (GCN Circ. 26884) provided an incomplete description of the X-ray light-curve of GRB 200125A. The PC mode data collected between 10 and 28 ks show an approximately constant count rate of ~0.15 count s^-1. We therefore do not give a prediction for T+24 hours.
  The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00950330.
  This circular is an official product of the Swift-XRT team.
• GCN Circular #26887
  A. Melandri, P. D'Avanzo (INAF-OAB), V. D’Elia (ASI-SSDC), W. Boschin, G. Mainella (INAF-TNG) on behalf of the CIBO collaboration report:
  We observed the field of GRB 200125A (Lien et al., GCN Circ. 26976) with the Italian 3.58m TNG telescope equipped with NICS in imaging mode. A series of images were obtained with the Ks and J filters on 2020-01-26 from 05:25 to 06:39 UT (i.e. from about 17.9 to 19.1 hours after the burst).
  We detect a source at the following coordinates:
  RA(J2000), Dec (J2000) = 15:12:11.30, -08:08:38.5 (+/- 0.5�).
  This position is consistent with the most updated XRT localisation (https://www.swift.ac.uk/xrt_positions/ ). We assume this is the same source detectd in the optical by Watson et al. (GCN Circ. 26882).
  From preliminary photometry, we estimate for this object a magnitude Ks ~ 17.2 (Vega, calibrated assuming K = 12.1 for the 2MASS star at RA(J2000), Dec (J2000) = 15:12:05.10, -08:07:06.9).
• GCN Circular #26889
  S. Belkin (IKI), A. Pozanenko (IKI), R. Ya. Inasaridze (AbAO ), E. Mazaeva (IKI), A. Volnova (IKI), V. R. Ayvazian (AbAO ), G.V. Kapanadze (AbAO), I. Molotov (KIAM) report on behalf of larger IKI GRB follow-up collaboration:
  We observed GRB 200125A (Lien et al., GCN 26876) with AS-32 (0.7m) telescope of Abastumani Observatory starting on Jan. 26 (UT) 01:32:27. We obtained several 60 s exposures in R-filter. We do not detect any source within enhanced Swift-XRT position (Beardmore et al., GCN 26878) in the stacked image. In particular we do not detect counterpart candidate (Watson et al., GCN 26882; Melandri et al., GCN 26887) Photometry of the field is following

  Date       UT start t-T0    Filter Exp.  OT    Err. UL(3sigma)
                      (mid, days)     (s)
  
  2020-01-26 01:32:27 0.520   R      56*60 n/d   n/d  21.2
  

  Photometry is based on nearby USNO-B1.0 stars (R2 magnitude):

  USNO-B1.0_id R2
  0818-0339924 16.46
  0818-0339917 16.94
  

• GCN Circular #26891
  Alan M. Watson (UNAM), Nat Butler (ASU), Alexander Kutyrev (GSFC), William H. Lee (UNAM), Michael G. Richer (UNAM), Ori Fox (STScI), J. Xavier Prochaska (UCSC), Josh Bloom (UCB), Antonino Cucchiara (UVI), Eleonora Troja (GSFC), Owen Littlejohns (ASU), Enrico Ramirez-Ruiz (UCSC), Jesús González (UNAM), Carlos Román-Zúñiga (UNAM), Harvey Moseley (GSFC), John Capone (UMD), V. Zach Golkhou (U. Wash.), and Vicki Toy (UMD) report:
  We observed the field of GRB 200125A (Lien et al., GCN Circ. 26876) with the Reionization and Transients Infrared Camera (RATIR; www.ratir.org) on the 1.5m Harold Johnson Telescope at the Observatorio Astronómico Nacional on Sierra San Pedro Mártir from 2020/01 26.42 to 2020/01 26.56 UTC (22.62 to 25.89 hours after the BAT trigger), obtaining a total of 2.52 hours exposure in the r and i bands.
  The source we reported previously (Watson et al., GCN Circ. 26882) has faded, confirming that it is the afterglow. In comparison with the USNO-B1 and 2MASS catalogs, we obtain the following detections:

    r	= 23.03 +/- 0.29
    i	= 21.27 +/- 0.05
  

  These magnitudes are in the AB system and are not corrected for Galactic extinction in the direction of the GRB.
  We thank the staff of the Observatorio Astronómico Nacional in San Pedro Mártir.
• GCN Circular #26892
  GRB 200125A: Swift/UVOT Upper Limits
  K. K. Simpson (PSU) and A. Y. Lien (GSFC/UMBC) report on behalf of the Swift/UVOT team:
  The Swift/UVOT began settled observations of the field of GRB 200125A 179 s after the BAT trigger (Lien et al., GCN Circ. 26876). No optical afterglow consistent with the XRT position (Beardmore et al. GCN Circ. 26878) 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           179          329          147         >20.4
  white              179         4176          344         >21.1
  v                 4387         4586          197         >18.4
  b                 3771         3971          197         >19.9
  u                  337          414           75         >18.9
  w1                4796         4835           38         >18.6
  m2                4591         4791          197         >19.3
  w2                4182         4382          197         >20.2
  

  The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.08 in the direction of the burst (Schlegel et al. 1998).
• GCN Circular #26894
  P.A. Evans, K.L. Page (U. Leicester) and A.Y. Lien (GSFC/UMBC) report on behalf of the Swift-XRT team:
  We provide an update on the XRT light curve evolution of GRB 200125A (GCN Circs. 26876 and 26885).
  The XRT light curve shows early, strong flaring activity which is interrupted at T0+414 s as the GRB went into Earth eclipse; by the time of the next observation (T0+3.8 ks) the light curve had faded by 4 orders of magnitude to ~0.1 ct/sec (2e-12 erg cm^-2 s^-1; 0.3-10 keV). It has remained approximately at this level, with some small variation, until our most recent data point at T0+113 ks (=T0+1.3 d). This suggests a very long-lived ‘plateau’ phase. Such long-duration plateaux are rare but not unique. Due to the expectation of a break at some, unknown point in the (probably) near future, we are unable to predict what the flux will be over the coming days. Observations are ongoing. The latest results can be viewed via: https://www.swift.ac.uk/xrt_products/00952164/
  This circular is an official product of the Swift-XRT team.
• GCN Circular #26897
  C. B. Markwardt (GSFC), S. D. Barthelmy (GSFC), J. R. Cummings (CPI), H. A. Krimm (NSF), S. Laha (GSFC/UMBC), A. Y. Lien (GSFC/UMBC), 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-170 to T+808 sec from the recent telemetry downlink, we report further analysis of BAT GRB 200125A (trigger #952164) (Lien et al., GCN Circ. 26876). The BAT ground-calculated position is RA, Dec = 228.069, -8.142 deg which is

     RA(J2000)  =  15h 12m 16.6s
     Dec(J2000) = -08d 08' 31.3"
  

  with an uncertainty of 1.8 arcmin, (radius, sys+stat, 90% containment). The partial coding was 42%.
  The mask-weighted light curve shows a multi-pulse structure that starts at ~T-40 s and ends at ~T+430 s. The three main pulses occurs at ~T0, ~T+200 s, and ~T+300 s, respectively. The highest peak is at ~T+287 s. The burst went out of the BAT FOV at T+501 s. T90 (15-350 keV) is 350.83 +- 34.03 sec (estimated error including systematics).
  The time-averaged spectrum from T-36.22 to T+427.74 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.95 +- 0.08. The fluence in the 15-150 keV band is 8.7 +- 0.4 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+286.67 sec in the 15-150 keV band is 4.0 +- 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/952164/BA/
• GCN Circular #26935
  A. Ridnaia, S. Golenetskii, R. Aptekar, D. Frederiks, M. Ulanov, D. Svinkin, A. Tsvetkova, A.Lysenko, and T. Cline on behalf of the Konus-Wind team, report:
  The long GRB 200125A (Swift-BAT trigger #952164: Lien et al., GCN 26876; Markwardt et al., GCN 26897) was detected by Konus-Wind in the waiting mode.
  The burst light curve shows three emission pulses in the interval from ~T0(BAT)-35 s to ~T0(BAT)+315 s.
  The K-W light curve of this burst is available at http://www.ioffe.rssi.ru/LEA/GRBs/GRB200125A/
  As observed by Konus-Wind, the burst had a fluence of 2.04(-0.16,+0.22)x10^-5 erg/cm2 and a 2.944-s peak flux, measured from ~T0(BAT)+287.4 s, of 2.80(-0.58,+0.62)x10^-7 erg/cm2/s (both in the 20 - 1500 keV energy range).
  The K-W 3-channel time-integrated spectrum (from ~T0(BAT)-33.5 s to ~T0(BAT)+316.8 s) is best described by simple power-law model with photon index of -2.14(-0.09,+0.1), chi2=0.08/1 dof.
  All the quoted errors are estimated at the 1 sigma confidence level. All the presented results are preliminary.