Gamma-ray Burst 180102A

(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:     Tue 02 Jan 18 15:50:02 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     802999,   Seg_Num: 0
GRB_RA:          203.115d {+13h 32m 28s} (J2000),
                 203.271d {+13h 33m 05s} (current),
                 202.681d {+13h 30m 43s} (1950)
GRB_DEC:         +62.148d {+62d 08' 53"} (J2000),
                 +62.056d {+62d 03' 21"} (current),
                 +62.405d {+62d 24' 16"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       3917 [cnts]    Image_Peak=176 [image_cnts]
TRIGGER_DUR:     1.024 [sec] 
TRIGGER_INDEX:   146     E_range: 25-100 keV
BKG_INTEN:       24996 [cnts]
BKG_TIME:        56971.74 SOD {15:49:31.74} UT
BKG_DUR:         8 [sec]
GRB_DATE:        18120 TJD;     2 DOY;   18/01/02
GRB_TIME:        56984.29 SOD {15:49:44.29} UT
GRB_PHI:         -34.24 [deg]
GRB_THETA:        18.98 [deg]
SOLN_STATUS:     0x20000003
RATE_SIGNIF:     11.83 [sigma]
IMAGE_SIGNIF:    7.37 [sigma]
MERIT_PARAMS:     +1  +0  +0  +0  +2  -3  +0  +0 +27  +0 
SUN_POSTN:       283.26d {+18h 53m 02s}  -22.88d {-22d 52' 35"}
SUN_DIST:        105.57 [deg]   Sun_angle= 5.3 [hr] (West of Sun)
MOON_POSTN:      111.38d {+07h 25m 30s}  +19.74d {+19d 44' 29"}
MOON_DIST:        73.51 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      114.73, 54.32 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      156.88, 62.15 [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 = 207.02,2.69 [deg].  
COMMENTS:           
COMMENTS:        NOTE: This BAT event is temporally(3.0<100sec) coincident with the FERMI_GBM event (trignum=536600992).

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Tue 02 Jan 18 15:50:11 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      44
TRIGGER_NUM:     536600992
GRB_RA:          205.267d {+13h 41m 04s} (J2000),
                 205.461d {+13h 41m 51s} (current),
                 204.726d {+13h 38m 54s} (1950)
GRB_DEC:         +40.267d {+40d 16' 00"} (J2000),
                 +40.176d {+40d 10' 34"} (current),
                 +40.519d {+40d 31' 08"} (1950)
GRB_ERROR:       26.80 [deg radius, statistical plus systematic]
GRB_INTEN:       53 [cnts/sec]
DATA_SIGNIF:     4.90 [sigma]
INTEG_TIME:      4.096 [sec]
GRB_DATE:        18120 TJD;     2 DOY;   18/01/02
GRB_TIME:        56987.21 SOD {15:49:47.21} UT
GRB_PHI:         273.00 [deg]
GRB_THETA:        80.00 [deg]
DATA_TIME_SCALE: 4.0960 [sec]
HARD_RATIO:      1.20
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      97%  GRB
2nd_MOST_LIKELY:   1%  Generic SGR
DETECTORS:       0,0,0, 0,1,0, 0,0,1, 0,0,0, 0,0,
SUN_POSTN:       283.26d {+18h 53m 02s}  -22.88d {-22d 52' 35"}
SUN_DIST:         95.85 [deg]   Sun_angle= 5.2 [hr] (West of Sun)
MOON_POSTN:      111.38d {+07h 25m 31s}  +19.74d {+19d 44' 29"}
MOON_DIST:        80.40 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:       88.08, 73.33 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      183.46, 46.27 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2018/bn180102660/quicklook/glg_lc_medres34_bn180102660.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 122.37,7.62 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(3.0<100sec) coincident with the SWIFT_BAT event (trignum=802999).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Tue 02 Jan 18 15:50:25 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      56
TRIGGER_NUM:     536600992
GRB_RA:          207.600d {+13h 50m 24s} (J2000),
                 207.790d {+13h 51m 10s} (current),
                 207.072d {+13h 48m 17s} (1950)
GRB_DEC:         +41.170d {+41d 10' 12"} (J2000),
                 +41.081d {+41d 04' 52"} (current),
                 +41.417d {+41d 25' 02"} (1950)
GRB_ERROR:       12.60 [deg radius, statistical only]
DATA_SIGNIF:     5.60 [sigma]
DATA_INTERVAL:   4.096 [sec]
GRB_DATE:        18120 TJD;     2 DOY;   18/01/02
GRB_TIME:        56987.21 SOD {15:49:47.21} UT
GRB_PHI:         275.00 [deg]
GRB_THETA:        80.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   4153 (Gnd S/W Version number)
SUN_POSTN:       283.26d {+18h 53m 02s}  -22.88d {-22d 52' 34"}
SUN_DIST:         94.66 [deg]   Sun_angle= 5.0 [hr] (West of Sun)
MOON_POSTN:      111.38d {+07h 25m 31s}  +19.74d {+19d 44' 28"}
MOON_DIST:        81.79 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:       85.90, 71.45 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      184.98, 47.96 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2018/bn180102660/quicklook/glg_lc_medres34_bn180102660.gif
POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_536600992.fits
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        The LC_URL file will not be created/available until ~15 min after the trigger.  
COMMENTS:        The POS_MAP_URL file will not be created/available until ~1.5 min after the notice.  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(3.0<100sec) coincident with the SWIFT_BAT event (trignum=802999).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Tue 02 Jan 18 15:51:32 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      0
TRIGGER_NUM:     536600992
GRB_RA:          195.550d {+13h 02m 12s} (J2000),
                 195.752d {+13h 03m 01s} (current),
                 194.987d {+12h 59m 57s} (1950)
GRB_DEC:         +46.620d {+46d 37' 12"} (J2000),
                 +46.523d {+46d 31' 25"} (current),
                 +46.889d {+46d 53' 19"} (1950)
GRB_ERROR:       10.05 [deg radius, statistical only]
DATA_SIGNIF:     5.20 [sigma]
DATA_INTERVAL:   7.168 [sec]
GRB_DATE:        18120 TJD;     2 DOY;   18/01/02
GRB_TIME:        56987.21 SOD {15:49:47.21} UT
GRB_PHI:         270.00 [deg]
GRB_THETA:        71.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   41531 (Gnd S/W Version number)
SUN_POSTN:       283.26d {+18h 53m 02s}  -22.88d {-22d 52' 34"}
SUN_DIST:        104.75 [deg]   Sun_angle= 5.8 [hr] (West of Sun)
MOON_POSTN:      111.39d {+07h 25m 34s}  +19.74d {+19d 44' 25"}
MOON_DIST:        72.02 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      117.42, 70.39 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      169.71, 47.74 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2018/bn180102660/quicklook/glg_lc_medres34_bn180102660.gif
POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_536600992.fits
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        This is likely a Long GRB.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        The LC_URL file will not be created/available until ~15 min after the trigger.  
COMMENTS:        The POS_MAP_URL file will not be created/available until ~1.5 min after the notice.  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(3.0<100sec) coincident with the SWIFT_BAT event (trignum=802999).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 02 Jan 18 15:51:01 UT
NOTICE_TYPE:     Swift-XRT Nack-Position
TRIGGER_NUM:     802999,   Seg_Num: 0
POINT_RA:        203.080d {+13h 32m 19s} (J2000)
POINT_DEC:       +62.154d {+62d 09' 15"} (J2000)
IMG_START_DATE:  18120 TJD;     2 DOY;   18/01/02
IMG_START_TIME:  57054.47 SOD {15:50:54.47} UT,   70.2 [sec] since BAT Trigger Time
COUNTS:          1    Min_needed= 20
STD_DEV:         0.00   Max_StdDev_for_Good=28.44 [arcsec]
PH2_ITER:        0    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:     Tue 02 Jan 18 15:53:10 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     802999,   Seg_Num: 0
GRB_RA:          203.115d {+13h 32m 28s} (J2000),
                 203.271d {+13h 33m 05s} (current),
                 202.681d {+13h 30m 43s} (1950)
GRB_DEC:         +62.148d {+62d 08' 53"} (J2000),
                 +62.056d {+62d 03' 21"} (current),
                 +62.405d {+62d 24' 16"} (1950)
GRB_DATE:        18120 TJD;     2 DOY;   18/01/02
GRB_TIME:        56984.29 SOD {15:49:44.29} UT
TRIGGER_INDEX:   146
GRB_PHI:         -34.24 [deg]
GRB_THETA:        18.98 [deg]
DELTA_TIME:      25.00 [sec]
TRIGGER_DUR:     1.024 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     11.83 [sigma]
IMAGE_SIGNIF:    7.37 [sigma]
LC_URL:          sw00802999000msb.lc
SUN_POSTN:       283.26d {+18h 53m 03s}  -22.88d {-22d 52' 34"}
SUN_DIST:        105.57 [deg]   Sun_angle= 5.3 [hr] (West of Sun)
MOON_POSTN:      111.41d {+07h 25m 39s}  +19.74d {+19d 44' 21"}
MOON_DIST:        73.50 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      114.73, 54.32 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      156.88, 62.15 [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 = 207.02,2.69 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 02 Jan 18 15:53:48 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     802999,   Seg_Num: 0
POINT_RA:        203.080d {+13h 32m 19s} (J2000)
POINT_DEC:       +62.154d {+62d 09' 15"} (J2000)
POINT_ROLL:      109.449d
IMG_START_DATE:  18120 TJD;     2 DOY;   18/01/02
IMG_START_TIME:  57057.78 SOD {15:50:57.78} UT,   73.5 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.479
N_STARS:         24
X_OFFSET:        604 [pixels]
Y_OFFSET:        506 [pixels]
X_MAX:           1563 [pixels]
Y_MAX:           1465 [pixels]
DET_THRESH:      10
PHOTO_THRESH:    5
SL_URL:          sw00802999000msufc0073.fits
SUN_POSTN:       283.26d {+18h 53m 03s}  -22.88d {-22d 52' 34"}
SUN_DIST:        105.58 [deg]   Sun_angle= 5.3 [hr] (West of Sun)
MOON_POSTN:      111.42d {+07h 25m 40s}  +19.74d {+19d 44' 20"}
MOON_DIST:        73.48 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      114.76, 54.32 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      156.85, 62.14 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 02 Jan 18 15:54:07 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     802999,   Seg_Num: 0
POINT_RA:        203.080d {+13h 32m 19s} (J2000)
POINT_DEC:       +62.154d {+62d 09' 15"} (J2000)
POINT_ROLL:      109.449d
IMG_START_DATE:  18120 TJD;     2 DOY;   18/01/02
IMG_START_TIME:  57057.78 SOD {15:50:57.78} UT,   73.5 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.479
N_STARS:         24
X_OFFSET:        604 [pixels]
Y_OFFSET:        506 [pixels]
X_MAX:           1563 [pixels]
Y_MAX:           1465 [pixels]
DET_THRESH:      10
PHOTO_THRESH:    5
SL_URL:          sw00802999000msufc0073.fits
SUN_POSTN:       283.26d {+18h 53m 03s}  -22.88d {-22d 52' 34"}
SUN_DIST:        105.59 [deg]   Sun_angle= 5.3 [hr] (West of Sun)
MOON_POSTN:      111.42d {+07h 25m 41s}  +19.74d {+19d 44' 19"}
MOON_DIST:        73.48 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      114.76, 54.32 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      156.85, 62.14 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 02 Jan 18 15:54:52 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     802999,   Seg_Num: 0
GRB_RA:          203.0677d {+13h 32m 16.24s} (J2000),
                 203.2239d {+13h 32m 53.73s} (current),
                 202.6331d {+13h 30m 31.94s} (1950)
GRB_DEC:         +62.1709d {+62d 10' 15.2"} (J2000),
                 +62.0787d {+62d 04' 43.4"} (current),
                 +62.4275d {+62d 25' 38.8"} (1950)
GRB_ERROR:       4.3 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  18120 TJD;     2 DOY;   18/01/02
IMG_START_TIME:  57067.00 SOD {15:51:07.00} UT,   82.7 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       283.26d {+18h 53m 03s}  -22.88d {-22d 52' 33"}
SUN_DIST:        105.60 [deg]   Sun_angle= 5.3 [hr] (West of Sun)
MOON_POSTN:      111.43d {+07h 25m 43s}  +19.74d {+19d 44' 17"}
MOON_DIST:        73.46 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      114.78, 54.31 [deg] galactic lon,lat of the burst
ECL_COORDS:      156.82, 62.14 [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:     Tue 02 Jan 18 15:55:03 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     802999,   Seg_Num: 0
POINT_RA:        203.080d {+13h 32m 19s} (J2000)
POINT_DEC:       +62.154d {+62d 09' 15"} (J2000)
ROLL:            109.449d
IMG_START_DATE:  18120 TJD;     2 DOY;   18/01/02
IMG_START_TIME:  57057.78 SOD {15:50:57.78} UT,   73.5 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     536601078
X_OFFSET:        923 [pixels]
Y_OFFSET:        825 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1083
Y_GRB_POS:       985
BINNING_INDEX:   1
IM_URL:          sw00802999000msuni0094.fits
SUN_POSTN:       283.26d {+18h 53m 03s}  -22.88d {-22d 52' 33"}
SUN_DIST:        105.59 [deg]   Sun_angle= 5.3 [hr] (West of Sun)
MOON_POSTN:      111.43d {+07h 25m 44s}  +19.74d {+19d 44' 16"}
MOON_DIST:        73.47 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      114.76, 54.32 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      156.85, 62.14 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 02 Jan 18 15:55:16 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     802999,   Seg_Num: 0
POINT_RA:        203.080d {+13h 32m 19s} (J2000)
POINT_DEC:       +62.154d {+62d 09' 15"} (J2000)
ROLL:            109.449d
IMG_START_DATE:  18120 TJD;     2 DOY;   18/01/02
IMG_START_TIME:  57057.78 SOD {15:50:57.78} UT,   73.5 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     536601078
X_OFFSET:        923 [pixels]
Y_OFFSET:        825 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1083
Y_GRB_POS:       985
BINNING_INDEX:   1
IM_URL:          sw00802999000msuni0094.fits
SUN_POSTN:       283.26d {+18h 53m 03s}  -22.88d {-22d 52' 33"}
SUN_DIST:        105.59 [deg]   Sun_angle= 5.3 [hr] (West of Sun)
MOON_POSTN:      111.43d {+07h 25m 44s}  +19.74d {+19d 44' 16"}
MOON_DIST:        73.47 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      114.76, 54.32 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      156.85, 62.14 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).  
COMMENTS:        All 4 attachments are included.

GCN Circular #22292
K. L. Page (U Leicester), A. A. Breeveld (UCL-MSSL), D. N. Burrows (PSU), A. Deich (PSU), C. Gronwall (PSU), J.D. Gropp (PSU), J. A. Kennea (PSU), H. A. Krimm (NSF/USRA), N. P. M. Kuin (UCL-MSSL), A. Y. Lien (GSFC/UMBC), A. Melandri (INAF-OAB), D. M. Palmer (LANL), M. H. Siegel (PSU) and A. Tohuvavohu (PSU) report on behalf of the Swift Team:
At 15:49:44 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 180102A (trigger=802999). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 203.115, +62.148 which is
```
   RA(J2000) = 13h 32m 28s
   Dec(J2000) = +62d 08' 53"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a multi-peaked structure with a duration of about 40 sec. The peak count rate was ~1800 counts/sec (15-350 keV), at ~1 sec after the trigger.
The XRT began observing the field at 15:50:54.4 UT, 70.2 seconds after the BAT trigger. Using promptly downlinked data we find an uncatalogued X-ray source located at RA, Dec 203.06761, 62.17091 which is equivalent to:
```
   RA(J2000)  = 13h 32m 16.23s
   Dec(J2000) = +62d 10' 15.3"
```
with an uncertainty of 3.8 arcseconds (radius, 90% containment). This location is 114 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 http://www.swift.ac.uk/sper. We cannot determine whether the source is fading at the present time.
A power-law fit to a spectrum formed from promptly downlinked event data gives a column density consistent with the Galactic value of 1.88 x 10^20 cm^-2 (Willingale et al. 2013).
UVOT took a finding chart exposure of 150 seconds with the White filter starting 73 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 none of the XRT error circle. The 8'x8' region for the list of sources generated on-board covers 100% of the XRT error circle. The list of sources is typically complete to about 18 mag. No correction has been made for the expected extinction corresponding to E(B-V) of 0.01.
Burst Advocate for this burst is K. L. Page (klp5 AT leicester.ac.uk). Please contact the BA by email if you require additional information regarding Swift followup of this burst. In extremely urgent cases, after trying the Burst Advocate, you can contact the Swift PI by phone (see Swift TOO web site for information: http://www.swift.psu.edu/too.html.)

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 02 Jan 18 16:13:52 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     802999,   Seg_Num: 0
POINT_RA:        203.079d {+13h 32m 19s} (J2000)
POINT_DEC:       +62.157d {+62d 09' 24"} (J2000)
POINT_ROLL:      109.447d
IMG_START_DATE:  18120 TJD;     2 DOY;   18/01/02
IMG_START_TIME:  57269.77 SOD {15:54:29.77} UT,   285.5 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.703
N_STARS:         33
X_OFFSET:        364 [pixels]
Y_OFFSET:        266 [pixels]
X_MAX:           1803 [pixels]
Y_MAX:           1705 [pixels]
DET_THRESH:      7
PHOTO_THRESH:    3
SL_URL:          sw00802999000msufc0285.fits
SUN_POSTN:       283.28d {+18h 53m 07s}  -22.88d {-22d 52' 29"}
SUN_DIST:        105.59 [deg]   Sun_angle= 5.3 [hr] (West of Sun)
MOON_POSTN:      111.64d {+07h 26m 34s}  +19.72d {+19d 43' 28"}
MOON_DIST:        73.39 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      114.76, 54.32 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      156.85, 62.14 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 02 Jan 18 16:14:05 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     802999,   Seg_Num: 0
POINT_RA:        203.079d {+13h 32m 19s} (J2000)
POINT_DEC:       +62.157d {+62d 09' 24"} (J2000)
POINT_ROLL:      109.447d
IMG_START_DATE:  18120 TJD;     2 DOY;   18/01/02
IMG_START_TIME:  57269.77 SOD {15:54:29.77} UT,   285.5 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.703
N_STARS:         33
X_OFFSET:        364 [pixels]
Y_OFFSET:        266 [pixels]
X_MAX:           1803 [pixels]
Y_MAX:           1705 [pixels]
DET_THRESH:      7
PHOTO_THRESH:    3
SL_URL:          sw00802999000msufc0285.fits
SUN_POSTN:       283.28d {+18h 53m 07s}  -22.87d {-22d 52' 29"}
SUN_DIST:        105.59 [deg]   Sun_angle= 5.3 [hr] (West of Sun)
MOON_POSTN:      111.65d {+07h 26m 35s}  +19.72d {+19d 43' 27"}
MOON_DIST:        73.39 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      114.76, 54.32 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      156.85, 62.14 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 02 Jan 18 16:14:27 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     802999,   Seg_Num: 0
GRB_RA:          203.0673d {+13h 32m 16.15s} (J2000),
                 203.2235d {+13h 32m 53.63s} (current),
                 202.6327d {+13h 30m 31.84s} (1950)
GRB_DEC:         +62.1717d {+62d 10' 18.1"} (J2000),
                 +62.0795d {+62d 04' 46.3"} (current),
                 +62.4283d {+62d 25' 41.7"} (1950)
GRB_ERROR:       2.4 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  18120 TJD;     2 DOY;   18/01/02
IMG_START_TIME:  57067.00 SOD {15:51:07.00} UT,   82.7 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       283.28d {+18h 53m 07s}  -22.87d {-22d 52' 29"}
SUN_DIST:        105.60 [deg]   Sun_angle= 5.3 [hr] (West of Sun)
MOON_POSTN:      111.65d {+07h 26m 36s}  +19.72d {+19d 43' 26"}
MOON_DIST:        73.38 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      114.78, 54.31 [deg] galactic lon,lat of the burst
ECL_COORDS:      156.81, 62.14 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        This is an Update Notice -- the RA,Dec values herein supersede the previous XRT_POS Notice.  
COMMENTS:        TAM values, flux and significance fields are not valid.  
COMMENTS:        This position was automatically generated on the ground using  
COMMENTS:        Photon Counting data telemetered via TDRSS (SPER data).  
COMMENTS:        See http://www.swift.ac.uk/sper/docs.php for details.  
COMMENTS:        This position was enhanced using UVOT field astrometry.  
COMMENTS:        The probability that this is a serendipitous source in the  
COMMENTS:        SPER window is 0.58% < P(seren) < 1.1%.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 02 Jan 18 16:14:59 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     802999,   Seg_Num: 0
POINT_RA:        203.079d {+13h 32m 19s} (J2000)
POINT_DEC:       +62.157d {+62d 09' 24"} (J2000)
ROLL:            109.447d
IMG_START_DATE:  18120 TJD;     2 DOY;   18/01/02
IMG_START_TIME:  57269.77 SOD {15:54:29.77} UT,   285.5 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     536601290
X_OFFSET:        923 [pixels]
Y_OFFSET:        825 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1083
Y_GRB_POS:       985
BINNING_INDEX:   1
IM_URL:          sw00802999000msuni0306.fits
SUN_POSTN:       283.28d {+18h 53m 07s}  -22.87d {-22d 52' 29"}
SUN_DIST:        105.59 [deg]   Sun_angle= 5.3 [hr] (West of Sun)
MOON_POSTN:      111.66d {+07h 26m 37s}  +19.72d {+19d 43' 25"}
MOON_DIST:        73.38 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      114.76, 54.32 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      156.85, 62.14 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 02 Jan 18 16:15:12 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     802999,   Seg_Num: 0
POINT_RA:        203.079d {+13h 32m 19s} (J2000)
POINT_DEC:       +62.157d {+62d 09' 24"} (J2000)
ROLL:            109.447d
IMG_START_DATE:  18120 TJD;     2 DOY;   18/01/02
IMG_START_TIME:  57269.77 SOD {15:54:29.77} UT,   285.5 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     536601290
X_OFFSET:        923 [pixels]
Y_OFFSET:        825 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1083
Y_GRB_POS:       985
BINNING_INDEX:   1
IM_URL:          sw00802999000msuni0306.fits
SUN_POSTN:       283.28d {+18h 53m 07s}  -22.87d {-22d 52' 29"}
SUN_DIST:        105.59 [deg]   Sun_angle= 5.3 [hr] (West of Sun)
MOON_POSTN:      111.66d {+07h 26m 38s}  +19.72d {+19d 43' 24"}
MOON_DIST:        73.38 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:      114.76, 54.32 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      156.85, 62.14 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).  
COMMENTS:        All 4 attachments are included.

GCN Circular #22293
P.A. Evans (U. Leicester) reports on behalf of the Swift-XRT team:
Using promptly downlinked XRT event data for GRB 180102A, we find an enhanced XRT position of the afterglow: RA, Dec: 203.0669, 62.1718 which is equivalent to:
```
   RA (J2000)  = 13 32 16.07
   Dec (J2000) = +62 10 18.6
```
with an uncertainty of 2.1 arcseconds (radius, 90% confidence). Analysis of the promptly available data is online at http://www.swift.ac.uk/sper/802999.
Position enhancement is is described by Goad et al. (2007, A&A, 476, 1401) and Evans et al. (2009, MNRAS, 397, 1177).
This circular is an official product of the Swift-XRT team.
GCN Circular #22294
A.P. Beardmore, P.A. Evans, M.R. Goad and J.P. Osborne (U. Leicester) report on behalf of the Swift-XRT team.
Using 611 s of XRT Photon Counting mode data and 1 UVOT images for GRB 180102A, 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 = 203.06658, +62.17177 which is equivalent to:
```
RA (J2000): 13h 32m 15.98s
Dec (J2000): +62d 10' 18.4"
```
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 #22295
P. Veres (UAH) reports on behalf of the Fermi GBM Team:
"At 15:49:47.21 UT on 2 January 2018, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 180102A (trigger 536600992 / 180102660) which was also detected by Swift/BAT (Page et al., GCN 22292). The GBM on-ground location is consistent with the Swift position.
The angle from the Fermi LAT boresight at the GBM trigger time is 60 degrees.
The GBM light curve consists of a single pulse with a duration (T90) of about 16 s (50-300 keV). The time-averaged spectrum from T0-6.1 s to T0+2.0 s is best fit by a power law function with an exponential high-energy cutoff. The power law index is -0.40 +/- 0.44 and the cutoff energy, parameterized as Epeak, is 54.9 +/- 6.7 keV.
The event fluence (10-1000 keV) in this time interval is (4.31 +/- 0.45)E-7 erg/cm^2. The 1-sec peak photon flux measured starting from T0+0.7 s in the 10-1000 keV band is 1.76 +/- 0.19 ph/s/cm^2.
A Band function fits the spectrum equally well with Epeak= 41.8 +/- 9.2 keV, alpha = 0.59 +/- 1.18 and beta = 2.52 +/- 0.35.
The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog."
GCN Circular #22296
A. D'Ai (INAF-IASFPA), A. Melandri (INAF-OAB), D.N. Burrows (PSU), A. Tohuvavohu (PSU), S. J. LaPorte (PSU), J.P. Osborne (U. Leicester), A.P. Beardmore (U. Leicester), P. D'Avanzo (INAF-OAB) and K.L. Page report on behalf of the Swift-XRT team:
We have analysed 6.7 ks of XRT data for GRB 180102A (Page et al. GCN Circ. 22292), from 82 s to 19.2 ks after the BAT trigger. The data are entirely in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Beardmore et al. (GCN Circ. 22293).
The light curve can be modelled with a power-law decay with a decay index of alpha=0.55 (+/-0.06).
A spectrum formed from the PC mode data can be fitted with an absorbed power-law with a photon spectral index of 2.31 (+0.32, -0.30). The best-fitting absorption column is 4.0 (+1.4, -1.2) x 10^21 cm^-2, in excess of the Galactic value of 1.9 x 10^20 cm^-2 (Willingale et al. 2013). The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 3.3 x 10^-11 (6.3 x 10^-11) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
```
Total column:	     4.0 (+1.4, -1.2) x 10^21 cm^-2
Galactic foreground: 1.9 x 10^20 cm^-2
Excess significance: 5.2 sigma
Photon index:	     2.31 (+0.32, -0.30)
```
If the light curve continues to decay with a power-law decay index of 0.55, the count rate at T+24 hours will be 6.5 x 10^-3 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 2.2 x 10^-13 (4.1 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/00802999.
This circular is an official product of the Swift-XRT team.
GCN Circular #22297
V. Lipunov, E. Gorbovskoy, N.Tyurina, V.Kornilov, D.Kuvshinov, A.V.Krylov, I.Gorbunov, P.Balanutsa, A.Kuznetsov, V.V.Chazov, D. Vlasenko Lomonosov Moscow State University, Sternberg Astronomical Institut of MSU
V.Yurkov, Yu.Sergienko Blagoveschensk Educational State University, Blagoveschensk
R.Podesta, C.Lopez, F. Podesta Observatorio Astronomico Felix Aguilar (OAFA), National University of San Juan, Argentina
H. Levato, C. Saffe Instituto de Ciencias Astronomicas,de la Tierra y del Espacio (ICATE), San Juan, Argentina
D.Buckley, S. Potter, A.Kniazev, M.Kotze South African Astronomical Observatory
R. Rebolo, M. Serra, N. Lodieu, G. Israelian, L. Suarez-Andres The Instituto de Astrofisica de Canarias
O.Gres, K.Ivanov, S.Yazev, N.M.Budnev, O.Gres, O.Chuvalaev, V.A.Poleshchuk, Irkutsk State University
A. Tlatov, V.Senik, A.V. Parhomenko, D. Dormidontov Kislovodsk Solar Station of the Pulkovo Observatory
MASTER-Kislovodsk robotic telescope (MASTER-Net: http://observ.pereplet.ru) located in Kislovodsk was pointed to the GRB180102A 23 sec after notice time and 43 sec after trigger time at 2018-01-02 15:50:27 UT (Page et al., GCN #22292; Veres GCN22295). On our first (10s exposure) set we haven`t found optical transient within Swift error-box (D'Ai et al., GCN #22296; Beardmore et al., GCN 22294). The 5-sigma upper limit has been about 13.7 mag The message may be cited.
The observations made on zenit distance = 74 degrees, galaxy latitude b = 55 degree. The moon (99 % bright part) is 14 degrees above the horizon. The distance between moon and object is 73 The sun altitude is -22.3 degree. The object can be observed till sunrise at 2018-01-03 04:41:55.
MASTER-Tavrida robotic telescope (MASTER-Net: http://observ.pereplet.ru) located in Crimea was pointed to the GRB180102.66 3221 sec after notice time and 3247 sec after trigger time at 2018-01-02 16:43:51 UT. On our 22-th (180s exposure) set we haven`t found optical transient within SWIFT error-box (ra=203.113 dec=62.1472 r=0.05). The message may be cited.
The observations made on zenit distance = 73 degrees, galaxy latitude b = 55 degree. The moon (99 % bright part) is 18 degrees above the horizon. The distance between moon and object is 73 The sun altitude is -25.8 degree. The object can be observed till sunrise at 2018-01-03 05:20:03.
MASTER II robotic telescope (MASTER-Net: http://observ.pereplet.ru) located in Blagoveschensk was pointed to the GRB180102.66 21451 sec after notice time and 21471 sec after trigger time at 2018-01-02 21:47:35 UT. We not optical transient within SWIFT error-box (ra=203.113 dec=62.1472 r=0.05) brighter then 16.7.
The 5-sigma upper limit has been about 16.24mag The message may be cited.
The observations made on zenit distance = 12 degrees, galaxy latitude b = 55 degree. The moon (99 % bright part) is 20 degrees above the horizon. The distance between moon and object is 72 Observations started at twilight. The sun altitude is -15.2 degree. The object can be observed till sunrise at 2018-01-03 23:26:49
This message can be cited.
GCN Circular #22298
D. Malesani (DARK/NBI), K. E. Heintz (Univ. Iceland and DARK/NBI), A. Sagues Carracedo (NOT), Andreas Kjaer Dideriksen (Aarhus Univ.), report on behalf of a larger collaboration:
We observed the field of GRB 180102A (Page et al., GCN 22292; Veres, GCN 22295) with the Nordic Optical Telescope (NOT) equipped with the AlFOSC camera. Observations were carried out in the SDSS r and z filters (900 and 1000 s exposure, respectively), with a seeing of 1.5", and started on 2018 Jan 3.1769 UT (12.42 hr after the GRB trigger).
At the position of the X-ray counterpart (D'Ai et al., GCN 22296), no objects are detected down to (preliminary) limiting magnitudes r = 22.5, z = 22.0 (all AB, calibrated with reference to nearby Pan-STARRS stars).
GCN Circular #22299
A. A. Breeveld (UCL-MSSL) and K. L. Page (U. Leicester) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 180102A 74 s after the BAT trigger (Page et al., GCN Circ. 22292). No optical afterglow consistent with the XRT position (Beardmore et al. GCN Circ. 22294) 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            74          224          147         >20.8
u_FC               286          535          246         >19.9
white               74         7508          824         >21.3
v                  616         6484          352         >19.3
b                  541         7303          529         >20.3
u                  286         7098          717         >20.4
w1                 665         6893          529         >20.1
m2                 640         6688          350         >19.7
w2                 591         7692          528         >20.1
```
The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.01 in the direction of the burst (Schlegel et al. 1998).
GCN Circular #22300
T. Sakamoto (AGU), S. D. Barthelmy (GSFC), J. R. Cummings (CPI), H. A. Krimm (NSF/USRA), A. Y. Lien (GSFC/UMBC), C. B. Markwardt (GSFC), K. L. Page (U Leicester), D. M. Palmer (LANL), M. Stamatikos (OSU), T. N. Ukwatta (LANL) (i.e. the Swift-BAT team):
Using the data set from T-61 to T+243 sec from the recent telemetry downlink, we report further analysis of BAT GRB 180102A (trigger #802999) (Page et al. GCN Circ. 22292). The BAT ground-calculated position is RA, Dec = 203.078, 62.161 deg which is
```
  RA(J2000)  =  13h 32m 18.8s
  Dec(J2000) = +62d 09' 38.1"
```
with an uncertainty of 1.5 arcmin, (radius, sys+stat, 90% containment). The partial coding was 95%.
The mask-weighted light curve shows two overlapping pulses that starts at ~ T-8 s and ends at ~ T+6 s. The main peak occurs at ~T+1 s. T90 (15-350 keV) is 10.8 +- 1.7 sec (estimated error including systematics).
The time-averaged spectrum from T-7.62 to T+6.30 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 2.01 +- 0.18. The fluence in the 15-150 keV band is 3.5 +- 0.4 x 10^-7 erg/cm2. The 1-sec peak photon flux measured from T+0.80 sec in the 15-150 keV band is 1.0 +- 0.1 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/802999/BA/
GCN Circular #22301
E. Mazaeva (IKI), A. Pozanenko (IKI), I. Reva (FAPHI), M. Krugov (FAPHI), A. Volnova (IKI), A. Kusakin (FAPHI) report on behalf of larger GRB follow-up collaboration:
We observed the field of GRB 180102A (Page et al., GCN 22292) with Zeiss-1000 1-m telescope of Tien Shan Astronomical Observatory starting on Jan. 02 (UT) 21:34:54. We took several images in R-filter. We do not detect any new sources within enhanced XRT error circle (Beardmore et al., GCN 22294). Preliminary photometry of the field is following.
```
Date        UT start t-T0     Filter Exp.    OT    Err.  UL
                       (mid, days)    (s)

2018-01-02  21:34:54 0.25428  R      21*120  n/d   n/d   20.6
```
The photometry is based on several nearby USNO-B1.0 stars.
GCN Circular #22303
Y. Kitaoka, T. Sakamoto (AGU)
We observed the field of GRB 180102A detected by Swift (Page et al. GCN circ. 22292) with the 0.3 m AROMA-N telescope located at Aoyama Gakuin University (Sagamihara, Japan).
10 images of 60 sec exposures were taken in the R filter starting from January 2 on 15:52:26 (UT) about 3 minutes after the trigger and stopped on 16:04:28 (UT). We do not detect the optical afterglow both in the individual images and the stacked image at the location of the X-ray afterglow (Beardmore et al. GCN circ. 22294). The estimated five sigma upper limit is ~16.0 mag using the USNO-B1 catalog.

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Jochen Greiner, last update: 06-Jan-2018 [Disclaimer]