Gamma-ray Burst 200127A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

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Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 27 Jan 20 14:45:48 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     952791,   Seg_Num: 0
GRB_RA:          295.204d {+19h 40m 49s} (J2000),
                 295.361d {+19h 41m 27s} (current),
                 294.815d {+19h 39m 16s} (1950)
GRB_DEC:         +44.910d {+44d 54' 35"} (J2000),
                 +44.957d {+44d 57' 26"} (current),
                 +44.792d {+44d 47' 31"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       0 [cnts]    Image_Peak=2194 [image_cnts]
TRIGGER_DUR:     64.000 [sec] 
TRIGGER_INDEX:   20000     E_range: 15-50 keV
BKG_INTEN:       0 [cnts]
BKG_TIME:        0.00 SOD {00:00:00.00} UT
BKG_DUR:         0 [sec]
GRB_DATE:        18875 TJD;    27 DOY;   20/01/27
GRB_TIME:        53071.66 SOD {14:44:31.66} UT
GRB_PHI:         -38.19 [deg]
GRB_THETA:        37.48 [deg]
SOLN_STATUS:     0x13
RATE_SIGNIF:     0.00 [sigma]
IMAGE_SIGNIF:    12.94 [sigma]
MERIT_PARAMS:     +1  +0  +0  +6  +1  +2  +0  +0 -42  +0 
SUN_POSTN:       309.52d {+20h 38m 05s}  -18.49d {-18d 29' 22"}
SUN_DIST:         64.75 [deg]   Sun_angle= 0.9 [hr] (West of Sun)
MOON_POSTN:      340.96d {+22h 43m 51s}  -12.93d {-12d 55' 55"}
MOON_DIST:        71.07 [deg]
MOON_ILLUM:      7 [%]
GAL_COORDS:       78.16, 10.79 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      314.48, 64.51 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT-BAT GRB Coordinates.  
COMMENTS:        This is an image trigger.  (The RATE_SIGNIF & BKG_{INTEN, TIME, DUR} are undefined.)  
COMMENTS:        A point_source was found.  
COMMENTS:        This does not match any source in the on-board catalog.  
COMMENTS:        This does not match any source in the ground catalog.  
COMMENTS:        This is a GRB.  
COMMENTS:        This trigger occurred at longitude,latitude = 350.30,13.57 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 27 Jan 20 14:47:33 UT
NOTICE_TYPE:     Swift-XRT Image
TRIGGER_NUM:     952791,   Seg_Num: 0
GRB_RA:          295.1965d {+19h 40m 47.1s} (J2000),
                 295.3529d {+19h 41m 24.6s} (current),
                 294.8069d {+19h 39m 13.6s} (1950)
GRB_DEC:         +44.9024d {+44d 54' 08.6"} (J2000),
                 +44.9501d {+44d 57' 00.3"} (current),
                 +44.7847d {+44d 47' 05.0"} (1950)
GRB_ERROR:       5.4 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       48 [cnts]
IMG_START_DATE:  18875 TJD;    27 DOY;   20/01/27
IMG_START_TIME:  53212.16 SOD {14:46:52.16} UT,   140.5 [sec] since BAT Trigger Time
CENTROID_X:      304.70,  raw= 305  [pixels]
CENTROID_Y:      278.48,  raw= 278  [pixels]
ROLL:            164.98 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   -46.24
GRB_POS_XRT_Z:   -6.35
IMAGE_URL:       sw00952791000msxps_rw.img
SUN_POSTN:       309.52d {+20h 38m 05s}  -18.49d {-18d 29' 21"}
SUN_DIST:         64.74 [deg]   Sun_angle= 0.9 [hr] (West of Sun)
MOON_POSTN:      340.98d {+22h 43m 55s}  -12.93d {-12d 55' 38"}
MOON_DIST:        71.07 [deg]
MOON_ILLUM:      7 [%]
GAL_COORDS:       78.15, 10.79 [deg] galactic lon,lat of the burst
ECL_COORDS:      314.46, 64.50 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 27 Jan 20 14:47:21 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     952791,   Seg_Num: 0
GRB_RA:          295.1965d {+19h 40m 47.16s} (J2000),
                 295.3529d {+19h 41m 24.69s} (current),
                 294.8069d {+19h 39m 13.66s} (1950)
GRB_DEC:         +44.9024d {+44d 54' 08.6"} (J2000),
                 +44.9501d {+44d 57' 00.3"} (current),
                 +44.7847d {+44d 47' 05.0"} (1950)
GRB_ERROR:       5.6 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       9.40e-10 [erg/cm2/sec]
GRB_SIGNIF:      6.92 [sigma]
IMG_START_DATE:  18875 TJD;    27 DOY;   20/01/27
IMG_START_TIME:  53212.16 SOD {14:46:52.16} UT,   140.5 [sec] since BAT Trigger Time
TAM[0-3]:        327.67 237.21 261.64 243.59
AMPLIFIER:       2
WAVEFORM:        134
SUN_POSTN:       309.52d {+20h 38m 05s}  -18.49d {-18d 29' 21"}
SUN_DIST:         64.74 [deg]   Sun_angle= 0.9 [hr] (West of Sun)
MOON_POSTN:      340.98d {+22h 43m 54s}  -12.93d {-12d 55' 40"}
MOON_DIST:        71.07 [deg]
MOON_ILLUM:      7 [%]
GAL_COORDS:       78.15, 10.79 [deg] galactic lon,lat of the burst
ECL_COORDS:      314.46, 64.50 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        The XRT position is 0.55 arcmin from the BAT position.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 27 Jan 20 14:47:36 UT
NOTICE_TYPE:     Swift-XRT Processed Image
TRIGGER_NUM:     952791,   Seg_Num: 0
GRB_RA:          295.1965d {+19h 40m 47.1s} (J2000),
                 295.3529d {+19h 41m 24.6s} (current),
                 294.8069d {+19h 39m 13.6s} (1950)
GRB_DEC:         +44.9024d {+44d 54' 08.6"} (J2000),
                 +44.9501d {+44d 57' 00.3"} (current),
                 +44.7847d {+44d 47' 05.0"} (1950)
GRB_ERROR:       5.4 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       48 [cnts]
IMG_START_DATE:  18875 TJD;    27 DOY;   20/01/27
IMG_START_TIME:  53212.16 SOD {14:46:52.16} UT,   140.5 [sec] since BAT Trigger Time
CENTROID_X:      304.70,  raw= 305  [pixels]
CENTROID_Y:      278.48,  raw= 278  [pixels]
ROLL:            164.98 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   -46.24
GRB_POS_XRT_Z:   -6.35
IMAGE_URL:       sw00952791000msxps_rw.img
SUN_POSTN:       309.52d {+20h 38m 05s}  -18.49d {-18d 29' 21"}
SUN_DIST:         64.74 [deg]   Sun_angle= 0.9 [hr] (West of Sun)
MOON_POSTN:      340.98d {+22h 43m 55s}  -12.93d {-12d 55' 37"}
MOON_DIST:        71.07 [deg]
MOON_ILLUM:      7 [%]
GAL_COORDS:       78.15, 10.79 [deg] galactic lon,lat of the burst
ECL_COORDS:      314.46, 64.50 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Processed Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 27 Jan 20 14:48:48 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     952791,   Seg_Num: 0
GRB_RA:          295.204d {+19h 40m 49s} (J2000),
                 295.361d {+19h 41m 27s} (current),
                 294.815d {+19h 39m 16s} (1950)
GRB_DEC:         +44.910d {+44d 54' 35"} (J2000),
                 +44.957d {+44d 57' 26"} (current),
                 +44.792d {+44d 47' 31"} (1950)
GRB_DATE:        18875 TJD;    27 DOY;   20/01/27
GRB_TIME:        53071.66 SOD {14:44:31.66} UT
TRIGGER_INDEX:   20000
GRB_PHI:         -38.19 [deg]
GRB_THETA:        37.48 [deg]
DELTA_TIME:      0.00 [sec]
TRIGGER_DUR:     64.000 [sec] 
SOLN_STATUS:     0x13
RATE_SIGNIF:     0.00 [sigma]
IMAGE_SIGNIF:    12.94 [sigma]
LC_URL:          sw00952791000msb.lc
SUN_POSTN:       309.52d {+20h 38m 05s}  -18.49d {-18d 29' 20"}
SUN_DIST:         64.75 [deg]   Sun_angle= 0.9 [hr] (West of Sun)
MOON_POSTN:      340.99d {+22h 43m 57s}  -12.92d {-12d 55' 25"}
MOON_DIST:        71.08 [deg]
MOON_ILLUM:      7 [%]
GAL_COORDS:       78.16, 10.79 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      314.48, 64.51 [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 an image 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 = 350.30,13.57 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 27 Jan 20 14:50:37 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     952791,   Seg_Num: 0
POINT_RA:        295.213d {+19h 40m 51s} (J2000)
POINT_DEC:       +44.907d {+44d 54' 24"} (J2000)
POINT_ROLL:      164.980d
IMG_START_DATE:  18875 TJD;    27 DOY;   20/01/27
IMG_START_TIME:  53221.59 SOD {14:47:01.59} UT,   149.9 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        4.359
N_STARS:         190
X_OFFSET:        488 [pixels]
Y_OFFSET:        616 [pixels]
X_MAX:           1447 [pixels]
Y_MAX:           1575 [pixels]
DET_THRESH:      17
PHOTO_THRESH:    10
SL_URL:          sw00952791000msufc0149.fits
SUN_POSTN:       309.52d {+20h 38m 06s}  -18.49d {-18d 29' 19"}
SUN_DIST:         64.74 [deg]   Sun_angle= 0.9 [hr] (West of Sun)
MOON_POSTN:      341.00d {+22h 44m 00s}  -12.92d {-12d 55' 07"}
MOON_DIST:        71.07 [deg]
MOON_ILLUM:      7 [%]
GAL_COORDS:       78.16, 10.78 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      314.49, 64.50 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 27 Jan 20 14:52:28 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     952791,   Seg_Num: 0
POINT_RA:        295.213d {+19h 40m 51s} (J2000)
POINT_DEC:       +44.907d {+44d 54' 24"} (J2000)
ROLL:            164.980d
IMG_START_DATE:  18875 TJD;    27 DOY;   20/01/27
IMG_START_TIME:  53221.59 SOD {14:47:01.59} UT,   149.9 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     601829245
X_OFFSET:        865 [pixels]
Y_OFFSET:        955 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1025
Y_GRB_POS:       1115
BINNING_INDEX:   1
IM_URL:          sw00952791000msuni0174.fits
SUN_POSTN:       309.52d {+20h 38m 06s}  -18.49d {-18d 29' 18"}
SUN_DIST:         64.74 [deg]   Sun_angle= 0.9 [hr] (West of Sun)
MOON_POSTN:      341.02d {+22h 44m 04s}  -12.91d {-12d 54' 48"}
MOON_DIST:        71.08 [deg]
MOON_ILLUM:      7 [%]
GAL_COORDS:       78.16, 10.78 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      314.49, 64.50 [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:     Mon 27 Jan 20 14:59:37 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     952791,   Seg_Num: 0
POINT_RA:        295.215d {+19h 40m 52s} (J2000)
POINT_DEC:       +44.909d {+44d 54' 33"} (J2000)
POINT_ROLL:      164.981d
IMG_START_DATE:  18875 TJD;    27 DOY;   20/01/27
IMG_START_TIME:  53380.96 SOD {14:49:40.96} UT,   309.3 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        1.506
N_STARS:         190
X_OFFSET:        545 [pixels]
Y_OFFSET:        635 [pixels]
X_MAX:           1504 [pixels]
Y_MAX:           1594 [pixels]
DET_THRESH:      10
PHOTO_THRESH:    5
SL_URL:          sw00952791000msufc0309.fits
SUN_POSTN:       309.53d {+20h 38m 07s}  -18.49d {-18d 29' 13"}
SUN_DIST:         64.74 [deg]   Sun_angle= 0.9 [hr] (West of Sun)
MOON_POSTN:      341.07d {+22h 44m 18s}  -12.89d {-12d 53' 36"}
MOON_DIST:        71.09 [deg]
MOON_ILLUM:      7 [%]
GAL_COORDS:       78.16, 10.78 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      314.50, 64.50 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 27 Jan 20 14:59:55 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     952791,   Seg_Num: 0
POINT_RA:        295.215d {+19h 40m 52s} (J2000)
POINT_DEC:       +44.909d {+44d 54' 33"} (J2000)
POINT_ROLL:      164.981d
IMG_START_DATE:  18875 TJD;    27 DOY;   20/01/27
IMG_START_TIME:  53380.96 SOD {14:49:40.96} UT,   309.3 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        1.506
N_STARS:         190
X_OFFSET:        545 [pixels]
Y_OFFSET:        635 [pixels]
X_MAX:           1504 [pixels]
Y_MAX:           1594 [pixels]
DET_THRESH:      10
PHOTO_THRESH:    5
SL_URL:          sw00952791000msufc0309.fits
SUN_POSTN:       309.53d {+20h 38m 07s}  -18.49d {-18d 29' 13"}
SUN_DIST:         64.74 [deg]   Sun_angle= 0.9 [hr] (West of Sun)
MOON_POSTN:      341.08d {+22h 44m 19s}  -12.89d {-12d 53' 32"}
MOON_DIST:        71.09 [deg]
MOON_ILLUM:      7 [%]
GAL_COORDS:       78.16, 10.78 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      314.50, 64.50 [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:     Mon 27 Jan 20 15:00:57 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     952791,   Seg_Num: 0
POINT_RA:        295.215d {+19h 40m 52s} (J2000)
POINT_DEC:       +44.909d {+44d 54' 33"} (J2000)
ROLL:            164.981d
IMG_START_DATE:  18875 TJD;    27 DOY;   20/01/27
IMG_START_TIME:  53380.96 SOD {14:49:40.96} UT,   309.3 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     601829405
X_OFFSET:        865 [pixels]
Y_OFFSET:        955 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1025
Y_GRB_POS:       1115
BINNING_INDEX:   1
IM_URL:          sw00952791000msuni0334.fits
SUN_POSTN:       309.53d {+20h 38m 07s}  -18.49d {-18d 29' 13"}
SUN_DIST:         64.74 [deg]   Sun_angle= 0.9 [hr] (West of Sun)
MOON_POSTN:      341.09d {+22h 44m 21s}  -12.89d {-12d 53' 22"}
MOON_DIST:        71.09 [deg]
MOON_ILLUM:      7 [%]
GAL_COORDS:       78.16, 10.78 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      314.50, 64.50 [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:     Mon 27 Jan 20 15:01:11 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     952791,   Seg_Num: 0
POINT_RA:        295.215d {+19h 40m 52s} (J2000)
POINT_DEC:       +44.909d {+44d 54' 33"} (J2000)
ROLL:            164.981d
IMG_START_DATE:  18875 TJD;    27 DOY;   20/01/27
IMG_START_TIME:  53380.96 SOD {14:49:40.96} UT,   309.3 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     601829405
X_OFFSET:        865 [pixels]
Y_OFFSET:        955 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1025
Y_GRB_POS:       1115
BINNING_INDEX:   1
IM_URL:          sw00952791000msuni0334.fits
SUN_POSTN:       309.53d {+20h 38m 07s}  -18.49d {-18d 29' 12"}
SUN_DIST:         64.74 [deg]   Sun_angle= 0.9 [hr] (West of Sun)
MOON_POSTN:      341.09d {+22h 44m 21s}  -12.89d {-12d 53' 20"}
MOON_DIST:        71.09 [deg]
MOON_ILLUM:      7 [%]
GAL_COORDS:       78.16, 10.78 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      314.50, 64.50 [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 #26895
M. J. Moss (GWU), A. P. Beardmore (U Leicester), P. A. Evans (U Leicester), C. Gronwall (PSU), J.D. Gropp (PSU), J. A. Kennea (PSU), N. J. Klingler (PSU), A. Y. Lien (GSFC/UMBC), F. E. Marshall (NASA/GSFC), K. L. Page (U Leicester), M. H. Siegel (PSU) and A. Tohuvavohu (U Toronto) report on behalf of the Neil Gehrels Swift Observatory Team:
At 14:44:31 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 200127A (trigger=952791). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 295.204, +44.910 which is
```
   RA(J2000) = 19h 40m 49s
   Dec(J2000) = +44d 54' 35"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). As is usual with an image trigger, the available BAT light curve shows no significant structure.
The XRT began observing the field at 14:46:52.1 UT, 140.5 seconds after the BAT trigger. Using promptly downlinked data we find a bright, fading, uncatalogued X-ray source located at RA, Dec 295.19447, 44.90030 which is equivalent to:
```
   RA(J2000)  = 19h 40m 46.67s
   Dec(J2000) = +44d 54' 01.1"
```
with an uncertainty of 3.5 arcseconds (radius, 90% containment). This location is 42 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.
A power-law fit to a spectrum formed from promptly downlinked event data gives a column density consistent with the Galactic value of 2.17 x 10^21 cm^-2 (Willingale et al. 2013).
The initial flux in the 2.5 s image was 9.40e-10 erg cm^-2 s^-1 (0.2-10 keV).
UVOT took a finding chart exposure of 250 seconds with the U filter starting 309 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 19.2 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 18.0 mag. No correction has been made for the expected extinction corresponding to E(B-V) of 0.16.
Burst Advocate for this burst is M. J. Moss (mikejmoss3 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:     Mon 27 Jan 20 15:06:22 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     952791,   Seg_Num: 0
POINT_RA:        295.215d {+19h 40m 52s} (J2000)
POINT_DEC:       +44.909d {+44d 54' 33"} (J2000)
POINT_ROLL:      164.981d
IMG_START_DATE:  18875 TJD;    27 DOY;   20/01/27
IMG_START_TIME:  53935.78 SOD {14:58:55.78} UT,   864.1 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.241
N_STARS:         190
X_OFFSET:        305 [pixels]
Y_OFFSET:        395 [pixels]
X_MAX:           1744 [pixels]
Y_MAX:           1834 [pixels]
DET_THRESH:      12
PHOTO_THRESH:    6
SL_URL:          sw00952791000msufc0864.fits
SUN_POSTN:       309.53d {+20h 38m 08s}  -18.49d {-18d 29' 09"}
SUN_DIST:         64.74 [deg]   Sun_angle= 0.9 [hr] (West of Sun)
MOON_POSTN:      341.13d {+22h 44m 31s}  -12.87d {-12d 52' 27"}
MOON_DIST:        71.10 [deg]
MOON_ILLUM:      7 [%]
GAL_COORDS:       78.16, 10.78 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      314.50, 64.50 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 27 Jan 20 15:06:38 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     952791,   Seg_Num: 0
POINT_RA:        295.215d {+19h 40m 52s} (J2000)
POINT_DEC:       +44.909d {+44d 54' 33"} (J2000)
POINT_ROLL:      164.981d
IMG_START_DATE:  18875 TJD;    27 DOY;   20/01/27
IMG_START_TIME:  53935.78 SOD {14:58:55.78} UT,   864.1 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.241
N_STARS:         190
X_OFFSET:        305 [pixels]
Y_OFFSET:        395 [pixels]
X_MAX:           1744 [pixels]
Y_MAX:           1834 [pixels]
DET_THRESH:      12
PHOTO_THRESH:    6
SL_URL:          sw00952791000msufc0864.fits
SUN_POSTN:       309.53d {+20h 38m 08s}  -18.49d {-18d 29' 09"}
SUN_DIST:         64.74 [deg]   Sun_angle= 0.9 [hr] (West of Sun)
MOON_POSTN:      341.13d {+22h 44m 32s}  -12.87d {-12d 52' 25"}
MOON_DIST:        71.10 [deg]
MOON_ILLUM:      7 [%]
GAL_COORDS:       78.16, 10.78 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      314.50, 64.50 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        All 4 attachments are included.

GCN Circular #26896
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-Amur robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Blagoveshchensk State Pedagogical University) was pointed to the Swift GRB200127.61 (trigger No 952791,19h 40m 48.96s , +44d 54m 36.0s, R=0.05) errorbox 2 sec after notice time and 99 sec after trigger time at 2020-01-27 14:46:10 UT, with upper limit up to 12.5 mag. The observations began at zenith distance = 85 deg. The sun altitude is -56.5 deg.
MASTER-Kislovodsk robotic telescope located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) was pointed to the Swift GRB200127.61 errorbox 6 sec after notice time and 102 sec after trigger time at 2020-01-27 14:46:14 UT, with upper limit up to 16.1 mag. Observations started at twilight. The observations began at zenith distance = 64 deg. The sun altitude is -6.0 deg.
The galactic latitude b = 11 deg., longitude l = 78 deg.
Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=1270540
We obtain a following upper limits.
```
Tmid-T0  |          Site       |Filt.| Expt. | Limit| Comment
_________|_____________________|_____|_______|______|________

     109 |         MASTER-Amur |  P/ |    20 | 12.5 |        
     113 |   MASTER-Kislovodsk |  P| |    20 | 14.3 |        
     146 |         MASTER-Amur |  P/ |    30 | 12.5 |        
     727 |   MASTER-Kislovodsk |  P| |   130 | 16.1 |        
```
The observation and reduction will continue. The message may be cited.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 27 Jan 20 15:07:46 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     952791,   Seg_Num: 0
POINT_RA:        295.215d {+19h 40m 52s} (J2000)
POINT_DEC:       +44.909d {+44d 54' 33"} (J2000)
ROLL:            164.981d
IMG_START_DATE:  18875 TJD;    27 DOY;   20/01/27
IMG_START_TIME:  53935.78 SOD {14:58:55.78} UT,   864.1 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     601829960
X_OFFSET:        864 [pixels]
Y_OFFSET:        954 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1024
Y_GRB_POS:       1114
BINNING_INDEX:   1
IM_URL:          sw00952791000msuni0889.fits
SUN_POSTN:       309.54d {+20h 38m 09s}  -18.49d {-18d 29' 08"}
SUN_DIST:         64.74 [deg]   Sun_angle= 0.9 [hr] (West of Sun)
MOON_POSTN:      341.14d {+22h 44m 34s}  -12.87d {-12d 52' 13"}
MOON_DIST:        71.11 [deg]
MOON_ILLUM:      7 [%]
GAL_COORDS:       78.16, 10.78 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      314.50, 64.50 [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:     Mon 27 Jan 20 15:07:59 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     952791,   Seg_Num: 0
POINT_RA:        295.215d {+19h 40m 52s} (J2000)
POINT_DEC:       +44.909d {+44d 54' 33"} (J2000)
ROLL:            164.981d
IMG_START_DATE:  18875 TJD;    27 DOY;   20/01/27
IMG_START_TIME:  53935.78 SOD {14:58:55.78} UT,   864.1 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     601829960
X_OFFSET:        864 [pixels]
Y_OFFSET:        954 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1024
Y_GRB_POS:       1114
BINNING_INDEX:   1
IM_URL:          sw00952791000msuni0889.fits
SUN_POSTN:       309.54d {+20h 38m 09s}  -18.49d {-18d 29' 08"}
SUN_DIST:         64.74 [deg]   Sun_angle= 0.9 [hr] (West of Sun)
MOON_POSTN:      341.14d {+22h 44m 34s}  -12.87d {-12d 52' 11"}
MOON_DIST:        71.11 [deg]
MOON_ILLUM:      7 [%]
GAL_COORDS:       78.16, 10.78 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      314.50, 64.50 [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:     Mon 27 Jan 20 15:19:05 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     952791,   Seg_Num: 0
GRB_RA:          295.1941d {+19h 40m 46.58s} (J2000),
                 295.3505d {+19h 41m 24.11s} (current),
                 294.8045d {+19h 39m 13.08s} (1950)
GRB_DEC:         +44.9003d {+44d 54' 01.0"} (J2000),
                 +44.9480d {+44d 56' 52.8"} (current),
                 +44.7826d {+44d 46' 57.5"} (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:  18875 TJD;    27 DOY;   20/01/27
IMG_START_TIME:  53435.00 SOD {14:50:35.00} UT,   363.3 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       309.54d {+20h 38m 11s}  -18.48d {-18d 29' 01"}
SUN_DIST:         64.74 [deg]   Sun_angle= 0.9 [hr] (West of Sun)
MOON_POSTN:      341.23d {+22h 44m 56s}  -12.84d {-12d 50' 18"}
MOON_DIST:        71.13 [deg]
MOON_ILLUM:      7 [%]
GAL_COORDS:       78.15, 10.79 [deg] galactic lon,lat of the burst
ECL_COORDS:      314.46, 64.50 [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 0.58% < P(seren) < 1.1%.

GCN Circular #26899
S. Belkin (IKI), A. Pozanenko (IKI), R. Ya. Inasaridze (AbAO ), V. R. Ayvazian (AbAO ), G.V. Kapanadze (AbAO), E. Mazaeva (IKI), A. Volnova (IKI), I. Molotov (KIAM) report on behalf of larger IKI GRB follow-up collaboration:
We observed the GRB 200127A (Moss et al., GCN 26895) with AS-32 (0.7m) telescope of Abastumani Observatory starting on Jan. 27 (UT) 15:09:06. We obtained several 60 s exposures in R-filter. We do not detect any source within Swift-XRT position (Moss et al., GCN 26895). Preliminary photometry of the field is following
```
Date       UT start t-T0    Filter Exp.  OT    Err. UL(3sigma)
                    (mid, days)     (s)

2020-01-27 15:09:06 0.02922 R      35*60 n/d   n/d  20.4
```
Photometry is based on nearby USNO-B1.0 stars (R2 magnitude):
```
USNO-B1.0_id R2
1349-0340354 14.16
1349-0343444 15.86
```
GCN Circular #26901
J.A. Kennea (PSU), K.L. Page (U. Leicester), A.P. Beardmore (U. Leicester), P.A. Evans (U. Leicester), P. D'Avanzo (INAF-OAB), M.G. Bernardini (INAF-OAB), E. Ambrosi (INAF-IASFPA) , B. Sbarufatti (PSU), D.N. Burrows (PSU) and M.J. Moss report on behalf of the Swift-XRT team:
We have analysed 8.3 ks of XRT data for GRB 200127A (Moss et al. GCN Circ. 26895), from 130 s to 18.2 ks after the BAT trigger. The data comprise 215 s in Windowed Timing (WT) mode (the first 9 s were taken while Swift was slewing) with the remainder in Photon Counting (PC) mode. The refined XRT position is RA, Dec = 295.1933, +44.9008 which is equivalent to:
```
RA (J2000): 19 40 46.40
Dec(J2000): +44 54 02.8
```
with an uncertainty of 3.5 arcsec (radius, 90% confidence).
The light curve can be modelled with a series of power-law decays. The initial decay index is alpha=1.1 (+0.6, -2.6). At T+172 s the decay steepens to an alpha of 2.58 (+0.18, -0.15) before breaking again at T+648 s to a final decay with index alpha=1.32 (+0.09, -0.12).
A spectrum formed from the WT mode data can be fitted with an absorbed power-law with a photon spectral index of 1.98 (+0.05, -0.04). The best-fitting absorption column is consistent with the Galactic value of 2.2 x 10^21 cm^-2 (Willingale et al. 2013). The PC mode spectrum has a photon index of 1.75 (+0.12, -0.11) 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 4.1 x 10^-11 (5.1 x 10^-11) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
```
Total column:	     2.2 (+0.3, -0.0) x 10^21 cm^-2
Galactic foreground: 2.2 x 10^21 cm^-2
Excess significance: <1.6 sigma
Photon index:	     1.75 (+0.12, -0.11)
```
If the light curve continues to decay with a power-law decay index of 1.32, the count rate at T+24 hours will be 1.8 x 10^-3 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 7.6 x 10^-14 (9.4 x 10^-14) erg cm^-2 s^-1.
The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00952791.
This circular is an official product of the Swift-XRT team.
GCN Circular #26902
P.A. Evans, M.R. Goad, J.P. Osborne and A.P. Beardmore (U. Leicester) report on behalf of the Swift-XRT team.
Using 7439 s of XRT Photon Counting mode data and 12 UVOT images for GRB 200127A, 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 = 295.19300, +44.90029 which is equivalent to:
```
RA (J2000): 19h 40m 46.32s
Dec (J2000): +44d 54' 01.0"
```
with an uncertainty of 1.4 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 #26904
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 200127A (Moss et al., GCN 26895) using the NEXT-0.6m telescope located at Nanshan, Xinjiang, China. Observations started at 23:26:58 UT on 2020-01-27 (i.e., 8.71 h after the BAT trigger), and 7x300 s Sloan r-band frames were obtained.
No optical afterglow is detected within the enhanced Swift-XRT error circle (Evans et al., GCN 26902) in our stacked image, down to a limiting magnitude of r ~ 20.5, calibrated with the nearby PanSTARRS field.
GCN Circular #26913
Johan P. U. Fynbo (DAWN/NBI), Daniele B. Malesani (DTU Space), Kasper E. Heintz (Univ. Iceland), Luca Izzo (DARK/NBI), Amanda Djupvik (NOT), report on behalf of a larger collaboration:
On 2020 Jan 28.292 UT (16.274 hr after the GRB) we observed the field of GRB200127A (Moss et al., GCN 26895; Evans et al., GCN26902) with the Nordic Optical Telescope in the SDSS r-filter for a total integration time of 900 s. Within the XRT position, we find no evidence for afterglow emission above a 3-sigma limit of about 23 mag AB, calibrated against field stars from the PAN-STARRS catalog.
GCN Circular #26914
S. Belkin (IKI), A. Pozanenko (IKI), E. Klunko (ISTP), E. Mazaeva (IKI), A. Volnova (IKI) report on behalf of IKI-GRB-FuN:
We observed the field of GRB 200127A (Moss et al., GCN 26895) with AZT-33IK telescope of Sayan observatory (Mondy) starting on Jan. 27 (UT) 21:48:01. We do not detect any optical object within Enhanced Swift-XRT position (Evans et al., GCN 26902) in agreement with non-detection of an afterglow (Liu et al., GCN 26904; Fynbo et al., GCN 26913). Preliminary photometry of the field is following.
```
Date UT start       t-T0,   Filter Exp.,  OT  Err  UL(3sigma)
                     (days)         (s)
2020-01-27 21:48:01 0.30868 R      21*120 n/d n/d  22.8
```
Photometry is based on the USNO-B1.0 nearby stars.
```
USNO-B1.0    R2
1349-0340555 18.02
1349-0340544 17.39
```
GCN Circular #26919
A. Belles (PSU) and M. J. Moss (GWU) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 200127A 150 s after the BAT trigger (Moss et al., GCN Circ. 26895). No optical afterglow consistent with the XRT position (Evans et al., GCN Circ. 26902) 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           150          300          147         >20.4
u_FC               310          560          246         >19.4
white              150        11742         1368         >22.3
v                  640        16568         1317         >20.2
b                  566        10830         1121         >21.3
u                  310         6701          638         >20.2
w1                 690        18173         1095         >21.1
m2                 838        17473         1298         >20.6
w2                 615        12437         1110         >20.5
```
The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.16 in the direction of the burst (Schlegel et al. 1998).
GCN Circular #26939
D. M. Palmer (LANL), S. D. Barthelmy (GSFC), J. R. Cummings (CPI), H. A. Krimm (NSF), S. Laha (GSFC/UMBC), A. Y. Lien (GSFC/UMBC), C. B. Markwardt (GSFC), M. J. Moss (GWU) T. Sakamoto (AGU), M. Stamatikos (OSU), T. N. Ukwatta (LANL) (i.e. the Swift-BAT team):
Using the data set from T-240 to T+1079 sec from the recent telemetry downlink, we report further analysis of BAT GRB 200127A (trigger #952791) (Moss et al., GCN Circ. 26895). The BAT ground-calculated position is RA, Dec = 295.206, 44.934 deg which is
```
   RA(J2000)  =  19h 40m 49.4s
   Dec(J2000) = +44d 56' 03.5"
```
with an uncertainty of 2.4 arcmin, (radius, sys+stat, 90% containment). The partial coding was 50%.
The mask-weighted light curve shows a long weak emission that starts around ~T-150 s and ends at ~T+90 s. T90 (15-350 keV) is 216.9 +- 23.5 sec (estimated error including systematics).
The time-averaged spectrum from T-144.22 to T+92.97 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.64 +- 0.19. The fluence in the 15-150 keV band is 2.4 +- 0.3 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+41.80 sec in the 15-150 keV band is 0.7 +- 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/952791/BA/

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Jochen Greiner, last update: 29-Jan-2020 [Disclaimer]