Gamma-ray Burst 180113A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

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Results of Observations

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 13 Jan 18 02:47:35 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     804999,   Seg_Num: 0
GRB_RA:           19.215d {+01h 16m 52s} (J2000),
                  19.531d {+01h 18m 07s} (current),
                  18.346d {+01h 13m 23s} (1950)
GRB_DEC:         +68.682d {+68d 40' 55"} (J2000),
                 +68.777d {+68d 46' 36"} (current),
                 +68.418d {+68d 25' 06"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       8358 [cnts]    Image_Peak=1016 [image_cnts]
TRIGGER_DUR:     1.024 [sec] 
TRIGGER_INDEX:   146     E_range: 25-100 keV
BKG_INTEN:       24515 [cnts]
BKG_TIME:        10011.69 SOD {02:46:51.69} UT
BKG_DUR:         8 [sec]
GRB_DATE:        18131 TJD;    13 DOY;   18/01/13
GRB_TIME:        10026.66 SOD {02:47:06.66} UT
GRB_PHI:          27.75 [deg]
GRB_THETA:        27.05 [deg]
SOLN_STATUS:     0x20000003
RATE_SIGNIF:     87.54 [sigma]
IMAGE_SIGNIF:    20.30 [sigma]
MERIT_PARAMS:     +1  +0  +0  +0  +2  +7  +0  +1 +30  +0 
SUN_POSTN:       294.68d {+19h 38m 42s}  -21.50d {-21d 29' 58"}
SUN_DIST:        108.15 [deg]   Sun_angle= -5.7 [hr] (East of Sun)
MOON_POSTN:      248.83d {+16h 35m 20s}  -17.17d {-17d 10' 28"}
MOON_DIST:       120.05 [deg]
MOON_ILLUM:      14 [%]
GAL_COORDS:      125.25,  5.92 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       54.45, 53.81 [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 = 184.88,-16.66 [deg].  
COMMENTS:           
COMMENTS:        NOTE: This BAT event is temporally(0.0<100sec) coincident with the FERMI_GBM event (trignum=537504431).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Sat 13 Jan 18 02:47:30 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      48
TRIGGER_NUM:     537504431
GRB_RA:           18.733d {+01h 14m 56s} (J2000),
                  19.050d {+01h 16m 12s} (current),
                  17.865d {+01h 11m 28s} (1950)
GRB_DEC:         +69.150d {+69d 09' 00"} (J2000),
                 +69.245d {+69d 14' 42"} (current),
                 +68.886d {+68d 53' 08"} (1950)
GRB_ERROR:       4.92 [deg radius, statistical plus systematic]
GRB_INTEN:       575 [cnts/sec]
DATA_SIGNIF:     28.30 [sigma]
INTEG_TIME:      1.024 [sec]
GRB_DATE:        18131 TJD;    13 DOY;   18/01/13
GRB_TIME:        10026.14 SOD {02:47:06.14} UT
GRB_PHI:          92.00 [deg]
GRB_THETA:        50.00 [deg]
DATA_TIME_SCALE: 1.0240 [sec]
HARD_RATIO:      0.55
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      95%  GRB
2nd_MOST_LIKELY:   4%  Generic Transient
DETECTORS:       0,1,0, 0,0,0, 0,0,0, 0,1,0, 0,0,
SUN_POSTN:       294.68d {+19h 38m 42s}  -21.50d {-21d 29' 58"}
SUN_DIST:        108.08 [deg]   Sun_angle= -5.6 [hr] (East of Sun)
MOON_POSTN:      248.83d {+16h 35m 19s}  -17.17d {-17d 10' 28"}
MOON_DIST:       119.65 [deg]
MOON_ILLUM:      14 [%]
GAL_COORDS:      125.03,  6.37 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       54.73, 54.29 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2018/bn180113116/quicklook/glg_lc_medres34_bn180113116.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 2.33,16.50 [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 CALET_GBM event (trignum=1199846617).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Sat 13 Jan 18 02:47:39 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      60
TRIGGER_NUM:     537504431
GRB_RA:           18.467d {+01h 13m 52s} (J2000),
                  18.783d {+01h 15m 08s} (current),
                  17.600d {+01h 10m 24s} (1950)
GRB_DEC:         +69.267d {+69d 16' 00"} (J2000),
                 +69.362d {+69d 21' 43"} (current),
                 +69.002d {+69d 00' 07"} (1950)
GRB_ERROR:       5.18 [deg radius, statistical plus systematic]
GRB_INTEN:       484 [cnts/sec]
DATA_SIGNIF:     47.20 [sigma]
INTEG_TIME:      4.096 [sec]
GRB_DATE:        18131 TJD;    13 DOY;   18/01/13
GRB_TIME:        10026.14 SOD {02:47:06.14} UT
GRB_PHI:          92.00 [deg]
GRB_THETA:        50.00 [deg]
DATA_TIME_SCALE: 4.0960 [sec]
HARD_RATIO:      0.59
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      95%  GRB
2nd_MOST_LIKELY:   4%  Generic Transient
DETECTORS:       0,1,0, 0,0,0, 0,0,0, 0,1,0, 0,0,
SUN_POSTN:       294.68d {+19h 38m 42s}  -21.50d {-21d 29' 58"}
SUN_DIST:        108.02 [deg]   Sun_angle= -5.6 [hr] (East of Sun)
MOON_POSTN:      248.83d {+16h 35m 20s}  -17.17d {-17d 10' 29"}
MOON_DIST:       119.51 [deg]
MOON_ILLUM:      14 [%]
GAL_COORDS:      124.93,  6.48 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       54.74, 54.44 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2018/bn180113116/quicklook/glg_lc_medres34_bn180113116.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 2.33,16.50 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(0.0<100sec) coincident with the SWIFT_BAT event (trignum=804999).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Sat 13 Jan 18 02:47:42 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      58
TRIGGER_NUM:     537504431
GRB_RA:           13.910d {+00h 55m 38s} (J2000),
                  14.197d {+00h 56m 47s} (current),
                  13.122d {+00h 52m 29s} (1950)
GRB_DEC:         +66.330d {+66d 19' 48"} (J2000),
                 +66.427d {+66d 25' 39"} (current),
                 +66.059d {+66d 03' 33"} (1950)
GRB_ERROR:       2.23 [deg radius, statistical only]
DATA_SIGNIF:     42.90 [sigma]
DATA_INTERVAL:   2.048 [sec]
GRB_DATE:        18131 TJD;    13 DOY;   18/01/13
GRB_TIME:        10026.14 SOD {02:47:06.14} UT
GRB_PHI:          90.00 [deg]
GRB_THETA:        53.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   4153 (Gnd S/W Version number)
SUN_POSTN:       294.68d {+19h 38m 42s}  -21.50d {-21d 29' 58"}
SUN_DIST:        105.56 [deg]   Sun_angle= -5.3 [hr] (East of Sun)
MOON_POSTN:      248.83d {+16h 35m 20s}  -17.17d {-17d 10' 29"}
MOON_DIST:       119.46 [deg]
MOON_ILLUM:      14 [%]
GAL_COORDS:      123.35,  3.46 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       49.29, 53.31 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2018/bn180113116/quicklook/glg_lc_medres34_bn180113116.gif
POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_537504431.fits
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        In the LAT Field-of-view.  
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(0.0<100sec) coincident with the SWIFT_BAT event (trignum=804999).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Sat 13 Jan 18 02:48:20 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      0
TRIGGER_NUM:     537504431
GRB_RA:           18.480d {+01h 13m 55s} (J2000),
                  18.791d {+01h 15m 10s} (current),
                  17.626d {+01h 10m 30s} (1950)
GRB_DEC:         +68.140d {+68d 08' 24"} (J2000),
                 +68.235d {+68d 14' 06"} (current),
                 +67.875d {+67d 52' 31"} (1950)
GRB_ERROR:       1.87 [deg radius, statistical only]
DATA_SIGNIF:     30.30 [sigma]
DATA_INTERVAL:   3.072 [sec]
GRB_DATE:        18131 TJD;    13 DOY;   18/01/13
GRB_TIME:        10026.14 SOD {02:47:06.14} UT
GRB_PHI:          92.00 [deg]
GRB_THETA:        51.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   41531 (Gnd S/W Version number)
SUN_POSTN:       294.68d {+19h 38m 42s}  -21.50d {-21d 29' 58"}
SUN_DIST:        107.76 [deg]   Sun_angle= -5.6 [hr] (East of Sun)
MOON_POSTN:      248.84d {+16h 35m 21s}  -17.18d {-17d 10' 32"}
MOON_DIST:       120.12 [deg]
MOON_ILLUM:      14 [%]
GAL_COORDS:      125.03,  5.36 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       53.51, 53.57 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2018/bn180113116/quicklook/glg_lc_medres34_bn180113116.gif
POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_537504431.fits
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        In the LAT Field-of-view.  
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(2.0<100sec) coincident with the INTEGRAL_SPIACS event (trignum=7994).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Sat 13 Jan 18 02:48:40 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      2
TRIGGER_NUM:     537504431
GRB_RA:           17.820d {+01h 11m 17s} (J2000),
                  18.122d {+01h 12m 29s} (current),
                  16.992d {+01h 07m 58s} (1950)
GRB_DEC:         +66.240d {+66d 14' 24"} (J2000),
                 +66.335d {+66d 20' 08"} (current),
                 +65.974d {+65d 58' 28"} (1950)
GRB_ERROR:       1.30 [deg radius, statistical only]
DATA_SIGNIF:     55.00 [sigma]
DATA_INTERVAL:   9.216 [sec]
GRB_DATE:        18131 TJD;    13 DOY;   18/01/13
GRB_TIME:        10026.14 SOD {02:47:06.14} UT
GRB_PHI:          92.00 [deg]
GRB_THETA:        53.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   41531 (Gnd S/W Version number)
SUN_POSTN:       294.68d {+19h 38m 42s}  -21.50d {-21d 29' 58"}
SUN_DIST:        107.04 [deg]   Sun_angle= -5.6 [hr] (East of Sun)
MOON_POSTN:      248.84d {+16h 35m 22s}  -17.18d {-17d 10' 34"}
MOON_DIST:       120.88 [deg]
MOON_ILLUM:      14 [%]
GAL_COORDS:      124.93,  3.45 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       51.21, 52.25 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2018/bn180113116/quicklook/glg_lc_medres34_bn180113116.gif
POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_537504431.fits
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        In the LAT Field-of-view.  
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(2.0<100sec) coincident with the INTEGRAL_SPIACS event (trignum=7994).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Sat 13 Jan 18 02:48:58 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      3
TRIGGER_NUM:     537504431
GRB_RA:           17.830d {+01h 11m 19s} (J2000),
                  18.135d {+01h 12m 33s} (current),
                  16.991d {+01h 07m 58s} (1950)
GRB_DEC:         +67.340d {+67d 20' 24"} (J2000),
                 +67.435d {+67d 26' 08"} (current),
                 +67.074d {+67d 04' 28"} (1950)
GRB_ERROR:       1.29 [deg radius, statistical only]
DATA_SIGNIF:     65.60 [sigma]
DATA_INTERVAL:   15.360 [sec]
GRB_DATE:        18131 TJD;    13 DOY;   18/01/13
GRB_TIME:        10026.14 SOD {02:47:06.14} UT
GRB_PHI:          92.00 [deg]
GRB_THETA:        52.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   41531 (Gnd S/W Version number)
SUN_POSTN:       294.68d {+19h 38m 42s}  -21.50d {-21d 29' 58"}
SUN_DIST:        107.32 [deg]   Sun_angle= -5.6 [hr] (East of Sun)
MOON_POSTN:      248.84d {+16h 35m 22s}  -17.18d {-17d 10' 36"}
MOON_DIST:       120.32 [deg]
MOON_ILLUM:      14 [%]
GAL_COORDS:      124.85,  4.54 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       52.35, 53.10 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2018/bn180113116/quicklook/glg_lc_medres34_bn180113116.gif
POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_537504431.fits
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        In the LAT Field-of-view.  
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(2.0<100sec) coincident with the INTEGRAL_SPIACS event (trignum=7994).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 13 Jan 18 02:51:02 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     804999,   Seg_Num: 0
GRB_RA:           19.215d {+01h 16m 52s} (J2000),
                  19.531d {+01h 18m 07s} (current),
                  18.346d {+01h 13m 23s} (1950)
GRB_DEC:         +68.682d {+68d 40' 55"} (J2000),
                 +68.777d {+68d 46' 36"} (current),
                 +68.418d {+68d 25' 06"} (1950)
GRB_DATE:        18131 TJD;    13 DOY;   18/01/13
GRB_TIME:        10026.66 SOD {02:47:06.66} UT
TRIGGER_INDEX:   146
GRB_PHI:          27.75 [deg]
GRB_THETA:        27.05 [deg]
DELTA_TIME:      -56.00 [sec]
TRIGGER_DUR:     1.024 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     87.54 [sigma]
IMAGE_SIGNIF:    20.30 [sigma]
LC_URL:          sw00804999000msb.lc
SUN_POSTN:       294.68d {+19h 38m 43s}  -21.50d {-21d 29' 57"}
SUN_DIST:        108.14 [deg]   Sun_angle= -5.7 [hr] (East of Sun)
MOON_POSTN:      248.86d {+16h 35m 27s}  -17.18d {-17d 10' 47"}
MOON_DIST:       120.05 [deg]
MOON_ILLUM:      14 [%]
GAL_COORDS:      125.25,  5.92 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       54.45, 53.81 [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 = 184.88,-16.66 [deg].

GCN Circular #22325
T. N. Ukwatta (LANL), J. R. Cummings (NASA/UMBC), A. D'Ai (INAF-IASFPA), V. D'Elia (ASDC), A. Deich (PSU), J.D. Gropp (PSU), J. A. Kennea (PSU) and M. H. Siegel (PSU) report on behalf of the Neil Gehrels Swift Observatory Team:
At 02:47:06 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 180113A (trigger=804999). Due to an observing constraint, Swift could not slew to this burst. The BAT on-board calculated location is RA, Dec 19.215, +68.682 which is
```
   RA(J2000) = 01h 16m 52s
   Dec(J2000) = +68d 40' 55"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a complex structure with a duration of about 20 sec. The peak count rate was ~9000 counts/sec (15-350 keV), at ~0 sec after the trigger.
Due to an observing constraint, Swift will not be able to observe this location until at least T0+36 hours. There will be no XRT or UVOT data until this time.
Burst Advocate for this burst is T. N. Ukwatta (tilan.ukwatta 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/too.html.)
GCN Circular #22328
P. Veres (UAH) reports on behalf of the Fermi GBM Team:
"At 02:47:06.14 UT on 13 January 2018, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 180113A (trigger 537504431 / 180113116). which was also detected by the Swift/BAT (Ukwatta et al., GCN 22325). The GBM on-ground location is consistent with the Swift position.
The trigger resulted in an Autonomous Repoint Request (ARR) by the GBM Flight Software owing to the high peak flux of the GRB. This ARR was accepted and the spacecraft slewed to the GBM in-flight location. The initial angle from the Fermi LAT boresight to the best location is 51 degrees.
The GBM light curve shows overlapping peaks with a duration (T90) of about 11 s (50-300 keV). The time-averaged spectrum from T0-1.4 s to T0+15.0 s is best fit by a Band function with Epeak = 247 +/- 12 keV, alpha = -0.59 +/- 0.04, and beta = -2.32 +/- 0.10.
The event fluence (10-1000 keV) in this time interval is (1.007 +/- 0.012)E-5 erg/cm^2. The 1-sec peak photon flux measured starting from T0+0.45 s in the 10-1000 keV band is 9.3 +/- 0.3 ph/s/cm^2.
The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog."
GCN Circular #22330
WeiKang Zheng and Alexei V. Filippenko (UC Berkeley) report on behalf of the KAIT GRB team:
The 0.76-m Katzman Automatic Imaging Telescope (KAIT), located at Lick Observatory, responded to Swift GRB 180113A (Ukwatta et al., GCN 22325) starting at 03:57:49 UT, 70 minutes after the burst, and lasted for about 1.5 hours. Observations were performed with a sequence in the clear (roughly R), V, and I filters, and the exposure time was 60 s per image. The field is relative crowded, after a preliminay analysis using the subtraction method, we do not detect any optical afterglow candidate within the Swift-BAT error circle (Ukwatta et al., GCN 22325). The typical limiting magnitude of our single clear image is about 19.5 mag calibrated to the APASS catalog.
GCN Circular #22332
T. N. Ukwatta (LANL), S. D. Barthelmy (GSFC), J. R. Cummings (CPI), H. A. Krimm (NSF/USRA), A. Y. Lien (GSFC/UMBC), C. B. Markwardt (GSFC), D. M. Palmer (LANL), T. Sakamoto (AGU), M. Stamatikos (OSU), (i.e. the Swift-BAT team):
Using the data set from T-61 to T+242 sec from the recent telemetry downlink, we report further analysis of BAT GRB 180113A (trigger #804999) (Ukwatta et al., GCN Circ. 22325). The BAT ground-calculated position is RA, Dec = 19.211, 68.682 deg which is
```
  RA(J2000)  =  01h 16m 50.7s
  Dec(J2000) = +68d 40' 55.9"
```
with an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment). The partial coding was 75%.
The mask-weighted light curve shows some weak emissions that starts at ~T-15 s, followed by the main structure with several overlapping pulses from ~ T0 to ~T+15 s, and a weak tail that lasts until ~T+70 s. T90 (15-350 keV) is 64 +- 16 sec (estimated error including systematics).
The time-averaged spectrum from T-12.98 to T+67.02 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.08 +- 0.06. The fluence in the 15-150 keV band is 4.8 +- 0.2 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+10.52 sec in the 15-150 keV band is 2.5 +- 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/804999/BA/
GCN Circular #22339
P. A. Evans (U. Leicester) reports on behalf of the Swift team:
Swift has initiated a ToO observation of the Swift/BAT GRB 180113A. Automated analysis of the XRT data will be presented online at http://www.swift.ac.uk/ToO_GRBs/00804999
Any uncatalogued X-ray sources detected in this analysis will be reported on this website and via GCN COUNTERPART notices. These are not necessarily related to the Swift/BAT event. Any X-ray source considered to be a probable afterglow candidate will be reported via a GCN Circular after manual consideration.
Details of the XRT automated analysis methods are detailed in Evans et al. (2007, A&A, 469, 379; 2009, MNRAS, 397, 1177 and 2014, ApJS, 210, 8).
This circular is an official product of the Swift-XRT team.
GCN Circular #22344
D. Frederiks, S. Golenetskii, R.Aptekar, P. Oleynik, M. Ulanov, D. Svinkin, A. Tsvetkova, A.Lysenko, A. Kozlova, and T. Cline, on behalf of the Konus-Wind team, report:
The long GRB 180113A (Swift/BAT detection: Ukwatta et al., GCN 22325, GCN 22332; Fermi-GBM detection: Veres, GCN 22328) triggered Konus-Wind at T0=3D10027.005 s UT (02:47:07.005).
The KW light curve shows a single pulse with a total duration of ~13 s. The emission is seen up to ~1 MeV.
As observed by Konus-Wind, the burst had a fluence of (1.36 =B1 0.10)x10^-5 erg/cm2 and a 64-ms peak energy flux, measured from T0+0.448, of (3.1 =B1 0.3)x10^-6 erg/cm2 (both in the 20 keV - 10 MeV energy range).
The time-integrated spectrum (measured from T0 to T0+16.640 s) is best fit in the 20 keV - 15 MeV range by a cutoff power-law (CPL) function with the following model parameters: the photon index alpha =3D -0.80(-0.12,+0.13), and the peak energy Ep =3D 293(-29,+36) keV, chi2 =3D 72/98 dof. Fitting this spectrum with the GRB (Band) function yields the same alpha and Ep, and an upper limit on beta of ~-3.0.
The spectrum near the peak count rate (measured from T0 to T0+8.448 s) is best fit in the 20 keV - 15 MeV range by the CPL function with the following model parameters: the photon index alpha =3D -0.72(-0.12,+0.13), and the peak energy Ep =3D 308(-30,+36) keV, chi2 =3D 83/98 dof. Fitting this spectrum with the GRB (Band) function yields the same alpha and Ep, and an upper limit on beta of ~-3.0.
The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB180113_T10027/
All the quoted errors are estimated at the 90% confidence level. All the presented results are preliminary.
GCN Circular #22359
S. Torii (Waseda U), A. Yoshida, T. Sakamoto, V. Pal'shin, Y. Kawakubo, M. Moriyama, Y. Yamada, A. Tezuka, S. Matsukawa (AGU), K. Yamaoka (Nagoya U), S. Nakahira (RIKEN), I. Takahashi (IPMU), Y. Asaoka, S. Ozawa (Waseda U), Y. Shimizu, T. Tamura (Kanagawa U), W. Ishizaki (ICRR), M. L. Cherry (LSU), S. Ricciarini (U of Florence), A. V. Penacchioni, P. S. Marrocchesi (U of Siena) and the CALET collaboration:
The long-duration GRB 180113A (Ukwatta et al., GCN circ. 22325; Veres et al., GCN circ. 22328; Frederiks et al., GCN circ. 22344) triggered the CALET Gamma-ray Burst Monitor (CGBM) at 02:47:03.27 on 13 January 2018. The burst signal was seen by the all CGBM instruments.
The light curve of the SGM shows two overlapping pulses. The emission starts at T+3 sec, peaks at T+4 sec and ends at T+16 sec. The T90 and the T50 durations measured by the SGM data are 11.3 +- 1.3 sec and 7.0 +- 0.6 sec (40-1000 keV), respectively.
The ground processed light curve is available at
http://cgbm.calet.jp/cgbm_trigger/ground/1199846617
The CALET data used in this analysis are provided by the Waseda CALET Operation Center located at the Waseda University.
GCN Circular #22363
V. Sharma (IUCAA), V. Bhalerao (IIT-B), D. Bhattacharya (IUCAA), A. R. Rao (TIFR) and S. Vadawale (PRL) report on behalf of the Astrosat CZTI collaboration:
Analysis of Astrosat CZTI data showed the detection of bright GRB 180113A, which was also detected by Swift (Ukwatta T. N. et al., GCN 22325), Fermi-GBM (Veres P. et al., GCN 22328), Konus-Wind (Frederiks D. et al., GCN 22344) and CALET (Torii S. et al., GCN 22359).
The source was clearly detected in the 40-200 keV energy range. The light curve shows multiple peaks of emission with strongest peak at 02:47:07.500 UT, ~1.5 s after the Swift-BAT trigger. The measured peak count rate is 345 cts/s above the background in combined data of four quadrants, with a total of 2536 cts. The local mean background count rate was 628 cts/s. Using cumulative rates, we measure a T90 of 14.3 s.
It was also clearly detected in the CsI anticoincidence (Veto) detector in the 100-500 keV energy range.
CZTI GRB detections are reported regularly on the payload site at http://astrosat.iucaa.in/czti/?q=grb. CZTI is built by a TIFR-led consortium of institutes across India, including VSSC, ISAC, IUCAA, SAC and PRL. The Indian Space Research Organisation funded, managed and facilitated the project.
GCN Circular #22639
D. Frederiks, S. Golenetskii, R.Aptekar, M. Ulanov, D. Svinkin, A. Tsvetkova, A.Lysenko, A. Kozlova, and T. Cline, on behalf of the Konus-Wind team, report:
The long GRB 180411A (Swift/BAT detection: Liu et al., GCN 22630; Markwardt et al., GCN 22633; Fermi-GBM detection: Poolakkil, GCN 22634) triggered Konus-Wind at T0=3D44862.530 s UT (12:27:42.530).
The KW light curve shows two multipeaked pulses with a total duration of ~90 s. The emission is seen up to ~10 MeV.
As observed by Konus-Wind, the burst had a fluence of (4.01 =B1 0.91)x10^-5 erg/cm2 and a 64-ms peak energy flux, measured from T0+50.496, of (3.3 =B1 0.7)x10^-6 erg/cm2 (both in the 20 keV - 10 MeV energy range).
The time-integrated spectrum (measured from T0 to T0+82.368 s) is best fit in the 20 keV - 15 MeV range by by the GRB (Band) function with the following model parameters: the low-energy photon index alpha =3D -1.17 (-0.12,+0.15), the high energy photon index beta =3D -2.39 (-0.90,+0.31), the peak energy Ep =3D 239 (-49,+55) keV, chi2 =3D 90/97 dof.
The spectrum near the peak count rate (measured from T0+41.408 to T0+57.792 s) is best fit in the 20 keV - 15 MeV range by the GRB (Band) function with the following model parameters: the low-energy photon index alpha =3D -0.89 (-0.13,+0.16), the high energy photon index beta =3D -2.49 (-0.77,+0.31), the peak energy Ep =3D 255 (-40,+44) keV, chi2 =3D 96/97 dof.
The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB180411_T44862/
All the quoted errors are estimated at the 90% confidence level. All the presented results are preliminary.

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Jochen Greiner, last update: 12-Apr-2018 [Disclaimer]