Gamma-ray Burst 180314B

(All information courtesy of the instrument teams.)

Previous IAU Circulars

none

Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 14 Mar 18 22:23:58 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     814305,   Seg_Num: 0
GRB_RA:          297.866d {+19h 51m 28s} (J2000),
                 298.060d {+19h 52m 14s} (current),
                 297.333d {+19h 49m 20s} (1950)
GRB_DEC:         +23.623d {+23d 37' 24"} (J2000),
                 +23.671d {+23d 40' 15"} (current),
                 +23.494d {+23d 29' 39"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       3863 [cnts]    Image_Peak=174 [image_cnts]
TRIGGER_DUR:     1.024 [sec] 
TRIGGER_INDEX:   219     E_range: 15-50 keV
BKG_INTEN:       26490 [cnts]
BKG_TIME:        80603.37 SOD {22:23:23.37} UT
BKG_DUR:         8 [sec]
GRB_DATE:        18191 TJD;    73 DOY;   18/03/14
GRB_TIME:        80616.94 SOD {22:23:36.94} UT
GRB_PHI:         -152.64 [deg]
GRB_THETA:        33.29 [deg]
SOLN_STATUS:     0x3
RATE_SIGNIF:     6.63 [sigma]
IMAGE_SIGNIF:    7.74 [sigma]
MERIT_PARAMS:     +1  +0  +0  +0  +1  -2  +0  +1 -48  +0 
SUN_POSTN:       354.76d {+23h 39m 02s}   -2.27d {-02d 16' 04"}
SUN_DIST:         60.88 [deg]   Sun_angle= 3.8 [hr] (West of Sun)
MOON_POSTN:      326.52d {+21h 46m 04s}  -14.26d {-14d 15' 25"}
MOON_DIST:        47.04 [deg]
MOON_ILLUM:      7 [%]
GAL_COORDS:       60.64, -1.63 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      306.26, 43.62 [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 = 68.15,1.84 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 14 Mar 18 22:25:30 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     814305,   Seg_Num: 0
GRB_RA:          297.8922d {+19h 51m 34.12s} (J2000),
                 298.0862d {+19h 52m 20.69s} (current),
                 297.3592d {+19h 49m 26.21s} (1950)
GRB_DEC:         +23.6224d {+23d 37' 20.6"} (J2000),
                 +23.6700d {+23d 40' 11.8"} (current),
                 +23.4933d {+23d 29' 35.8"} (1950)
GRB_ERROR:       6.0 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       6.44e-10 [erg/cm2/sec]
GRB_SIGNIF:      5.47 [sigma]
IMG_START_DATE:  18191 TJD;    73 DOY;   18/03/14
IMG_START_TIME:  80703.98 SOD {22:25:03.98} UT,   87.0 [sec] since BAT Trigger Time
TAM[0-3]:        327.65 237.22 261.67 243.63
AMPLIFIER:       2
WAVEFORM:        134
SUN_POSTN:       354.76d {+23h 39m 02s}   -2.27d {-02d 16' 03"}
SUN_DIST:         60.86 [deg]   Sun_angle= 3.8 [hr] (West of Sun)
MOON_POSTN:      326.53d {+21h 46m 07s}  -14.25d {-14d 15' 13"}
MOON_DIST:        47.03 [deg]
MOON_ILLUM:      7 [%]
GAL_COORDS:       60.65, -1.65 [deg] galactic lon,lat of the burst
ECL_COORDS:      306.30, 43.61 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        The XRT position is 1.43 arcmin from the BAT position.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 14 Mar 18 22:25:40 UT
NOTICE_TYPE:     Swift-XRT Image
TRIGGER_NUM:     814305,   Seg_Num: 0
GRB_RA:          297.8922d {+19h 51m 34.1s} (J2000),
                 298.0862d {+19h 52m 20.6s} (current),
                 297.3592d {+19h 49m 26.2s} (1950)
GRB_DEC:         +23.6224d {+23d 37' 20.6"} (J2000),
                 +23.6700d {+23d 40' 11.8"} (current),
                 +23.4933d {+23d 29' 35.8"} (1950)
GRB_ERROR:       5.8 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       30 [cnts]
IMG_START_DATE:  18191 TJD;    73 DOY;   18/03/14
IMG_START_TIME:  80703.98 SOD {22:25:03.98} UT,   87.0 [sec] since BAT Trigger Time
CENTROID_X:      248.58,  raw= 249  [pixels]
CENTROID_Y:      313.03,  raw= 313  [pixels]
ROLL:            106.94 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   34.48
GRB_POS_XRT_Z:   -136.28
IMAGE_URL:       sw00814305000msxps_rw.img
SUN_POSTN:       354.76d {+23h 39m 02s}   -2.27d {-02d 16' 03"}
SUN_DIST:         60.86 [deg]   Sun_angle= 3.8 [hr] (West of Sun)
MOON_POSTN:      326.53d {+21h 46m 08s}  -14.25d {-14d 15' 12"}
MOON_DIST:        47.03 [deg]
MOON_ILLUM:      7 [%]
GAL_COORDS:       60.65, -1.65 [deg] galactic lon,lat of the burst
ECL_COORDS:      306.30, 43.61 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 14 Mar 18 22:25:45 UT
NOTICE_TYPE:     Swift-XRT Processed Image
TRIGGER_NUM:     814305,   Seg_Num: 0
GRB_RA:          297.8922d {+19h 51m 34.1s} (J2000),
                 298.0862d {+19h 52m 20.6s} (current),
                 297.3592d {+19h 49m 26.2s} (1950)
GRB_DEC:         +23.6224d {+23d 37' 20.6"} (J2000),
                 +23.6700d {+23d 40' 11.8"} (current),
                 +23.4933d {+23d 29' 35.8"} (1950)
GRB_ERROR:       5.8 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       30 [cnts]
IMG_START_DATE:  18191 TJD;    73 DOY;   18/03/14
IMG_START_TIME:  80703.98 SOD {22:25:03.98} UT,   87.0 [sec] since BAT Trigger Time
CENTROID_X:      248.58,  raw= 249  [pixels]
CENTROID_Y:      313.03,  raw= 313  [pixels]
ROLL:            106.94 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   34.48
GRB_POS_XRT_Z:   -136.28
IMAGE_URL:       sw00814305000msxps_rw.img
SUN_POSTN:       354.76d {+23h 39m 02s}   -2.27d {-02d 16' 02"}
SUN_DIST:         60.86 [deg]   Sun_angle= 3.8 [hr] (West of Sun)
MOON_POSTN:      326.53d {+21h 46m 08s}  -14.25d {-14d 15' 11"}
MOON_DIST:        47.03 [deg]
MOON_ILLUM:      7 [%]
GAL_COORDS:       60.65, -1.65 [deg] galactic lon,lat of the burst
ECL_COORDS:      306.30, 43.61 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Processed Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 14 Mar 18 22:27:48 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     814305,   Seg_Num: 0
GRB_RA:          297.866d {+19h 51m 28s} (J2000),
                 298.060d {+19h 52m 14s} (current),
                 297.333d {+19h 49m 20s} (1950)
GRB_DEC:         +23.623d {+23d 37' 24"} (J2000),
                 +23.671d {+23d 40' 15"} (current),
                 +23.494d {+23d 29' 39"} (1950)
GRB_DATE:        18191 TJD;    73 DOY;   18/03/14
GRB_TIME:        80616.94 SOD {22:23:36.94} UT
TRIGGER_INDEX:   219
GRB_PHI:         -152.64 [deg]
GRB_THETA:        33.29 [deg]
DELTA_TIME:      -76.00 [sec]
TRIGGER_DUR:     1.024 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     6.63 [sigma]
IMAGE_SIGNIF:    7.74 [sigma]
LC_URL:          sw00814305000msb.lc
SUN_POSTN:       354.76d {+23h 39m 02s}   -2.27d {-02d 16' 00"}
SUN_DIST:         60.88 [deg]   Sun_angle= 3.8 [hr] (West of Sun)
MOON_POSTN:      326.55d {+21h 46m 12s}  -14.25d {-14d 14' 56"}
MOON_DIST:        47.05 [deg]
MOON_ILLUM:      7 [%]
GAL_COORDS:       60.64, -1.63 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      306.26, 43.62 [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 = 68.15,1.84 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 14 Mar 18 22:28:26 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     814305,   Seg_Num: 0
POINT_RA:        297.850d {+19h 51m 24s} (J2000)
POINT_DEC:       +23.624d {+23d 37' 27"} (J2000)
POINT_ROLL:      106.936d
IMG_START_DATE:  18191 TJD;    73 DOY;   18/03/14
IMG_START_TIME:  80711.06 SOD {22:25:11.06} UT,   94.1 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        3.845
N_STARS:         190
X_OFFSET:        560 [pixels]
Y_OFFSET:        464 [pixels]
X_MAX:           1519 [pixels]
Y_MAX:           1423 [pixels]
DET_THRESH:      16
PHOTO_THRESH:    9
SL_URL:          sw00814305000msufc0094.fits
SUN_POSTN:       354.76d {+23h 39m 02s}   -2.27d {-02d 16' 00"}
SUN_DIST:         60.90 [deg]   Sun_angle= 3.8 [hr] (West of Sun)
MOON_POSTN:      326.56d {+21h 46m 13s}  -14.25d {-14d 14' 51"}
MOON_DIST:        47.06 [deg]
MOON_ILLUM:      7 [%]
GAL_COORDS:       60.64, -1.61 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      306.25, 43.62 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 14 Mar 18 22:28:42 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     814305,   Seg_Num: 0
POINT_RA:        297.850d {+19h 51m 24s} (J2000)
POINT_DEC:       +23.624d {+23d 37' 27"} (J2000)
POINT_ROLL:      106.936d
IMG_START_DATE:  18191 TJD;    73 DOY;   18/03/14
IMG_START_TIME:  80711.06 SOD {22:25:11.06} UT,   94.1 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        3.845
N_STARS:         190
X_OFFSET:        560 [pixels]
Y_OFFSET:        464 [pixels]
X_MAX:           1519 [pixels]
Y_MAX:           1423 [pixels]
DET_THRESH:      16
PHOTO_THRESH:    9
SL_URL:          sw00814305000msufc0094.fits
SUN_POSTN:       354.76d {+23h 39m 02s}   -2.27d {-02d 16' 00"}
SUN_DIST:         60.90 [deg]   Sun_angle= 3.8 [hr] (West of Sun)
MOON_POSTN:      326.56d {+21h 46m 14s}  -14.25d {-14d 14' 49"}
MOON_DIST:        47.06 [deg]
MOON_ILLUM:      7 [%]
GAL_COORDS:       60.64, -1.61 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      306.25, 43.62 [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:     Wed 14 Mar 18 22:29:09 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     814305,   Seg_Num: 0
POINT_RA:        297.850d {+19h 51m 24s} (J2000)
POINT_DEC:       +23.624d {+23d 37' 27"} (J2000)
ROLL:            106.936d
IMG_START_DATE:  18191 TJD;    73 DOY;   18/03/14
IMG_START_TIME:  80711.06 SOD {22:25:11.06} UT,   94.1 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     542759131
X_OFFSET:        1001 [pixels]
Y_OFFSET:        663 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1161
Y_GRB_POS:       823
BINNING_INDEX:   1
IM_URL:          sw00814305000msuni0115.fits
SUN_POSTN:       354.76d {+23h 39m 02s}   -2.27d {-02d 16' 00"}
SUN_DIST:         60.90 [deg]   Sun_angle= 3.8 [hr] (West of Sun)
MOON_POSTN:      326.56d {+21h 46m 15s}  -14.25d {-14d 14' 46"}
MOON_DIST:        47.06 [deg]
MOON_ILLUM:      7 [%]
GAL_COORDS:       60.64, -1.61 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      306.25, 43.62 [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:     Wed 14 Mar 18 22:29:14 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     814305,   Seg_Num: 0
POINT_RA:        297.850d {+19h 51m 24s} (J2000)
POINT_DEC:       +23.624d {+23d 37' 27"} (J2000)
ROLL:            106.936d
IMG_START_DATE:  18191 TJD;    73 DOY;   18/03/14
IMG_START_TIME:  80711.06 SOD {22:25:11.06} UT,   94.1 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     542759131
X_OFFSET:        1001 [pixels]
Y_OFFSET:        663 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1161
Y_GRB_POS:       823
BINNING_INDEX:   1
IM_URL:          sw00814305000msuni0115.fits
SUN_POSTN:       354.76d {+23h 39m 02s}   -2.27d {-02d 16' 00"}
SUN_DIST:         60.90 [deg]   Sun_angle= 3.8 [hr] (West of Sun)
MOON_POSTN:      326.56d {+21h 46m 15s}  -14.25d {-14d 14' 45"}
MOON_DIST:        47.06 [deg]
MOON_ILLUM:      7 [%]
GAL_COORDS:       60.64, -1.61 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      306.25, 43.62 [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:     Wed 14 Mar 18 22:37:31 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     814305,   Seg_Num: 0
POINT_RA:        297.848d {+19h 51m 23s} (J2000)
POINT_DEC:       +23.622d {+23d 37' 20"} (J2000)
POINT_ROLL:      106.935d
IMG_START_DATE:  18191 TJD;    73 DOY;   18/03/14
IMG_START_TIME:  80924.88 SOD {22:28:44.88} UT,   307.9 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        1.028
N_STARS:         111
X_OFFSET:        681 [pixels]
Y_OFFSET:        343 [pixels]
X_MAX:           1640 [pixels]
Y_MAX:           1302 [pixels]
DET_THRESH:      9
PHOTO_THRESH:    4
SL_URL:          sw00814305000msufc0307.fits
SUN_POSTN:       354.77d {+23h 39m 04s}   -2.26d {-02d 15' 51"}
SUN_DIST:         60.90 [deg]   Sun_angle= 3.8 [hr] (West of Sun)
MOON_POSTN:      326.63d {+21h 46m 32s}  -14.23d {-14d 13' 42"}
MOON_DIST:        47.09 [deg]
MOON_ILLUM:      7 [%]
GAL_COORDS:       60.63, -1.61 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      306.24, 43.62 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN Circular #22491
P. D'Avanzo (INAF-OAB), A. Deich (PSU), J.D. Gropp (PSU), J. A. Kennea (PSU), A. Y. Lien (GSFC/UMBC), D. M. Palmer (LANL), B. Sbarufatti (PSU), M. H. Siegel (PSU) and A. Tohuvavohu (PSU) report on behalf of the Neil Gehrels Swift Observatory Team:
At 22:23:36 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 180314B (trigger=814305). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 297.866, +23.623 which is
```
   RA(J2000) = 19h 51m 28s
   Dec(J2000) = +23d 37' 24"
```
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 50 sec. The peak count rate was ~1500 counts/sec (15-350 keV), at ~0 sec after the trigger.
The XRT began observing the field at 22:25:03.9 UT, 87.0 seconds after the BAT trigger. Using promptly downlinked data we find a bright, uncatalogued X-ray source located at RA, Dec 297.88663, 23.62434 which is equivalent to:
```
   RA(J2000)  = 19h 51m 32.79s
   Dec(J2000) = +23d 37' 27.6"
```
with an uncertainty of 3.7 arcseconds (radius, 90% containment). This location is 68 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.
A power-law fit to a spectrum formed from promptly downlinked event data gives a column density consistent with the Galactic value of 8.94 x 10^21 cm^-2 (Willingale et al. 2013).
The initial flux in the 2.5 s image was 6.44e-10 erg cm^-2 s^-1 (0.2-10 keV).
UVOT took a finding chart exposure of 150 seconds with the White filter starting 94 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. Because of the density of catalogued stars, further analysis is required to report an upper limit for any afterglow in the region. No correction has been made for the large, but uncertain, extinction expected.
Burst Advocate for this burst is P. D'Avanzo (paolo.davanzo AT brera.inaf.it). 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:     Wed 14 Mar 18 22:37:46 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     814305,   Seg_Num: 0
POINT_RA:        297.848d {+19h 51m 23s} (J2000)
POINT_DEC:       +23.622d {+23d 37' 20"} (J2000)
POINT_ROLL:      106.935d
IMG_START_DATE:  18191 TJD;    73 DOY;   18/03/14
IMG_START_TIME:  80924.88 SOD {22:28:44.88} UT,   307.9 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        1.028
N_STARS:         111
X_OFFSET:        681 [pixels]
Y_OFFSET:        343 [pixels]
X_MAX:           1640 [pixels]
Y_MAX:           1302 [pixels]
DET_THRESH:      9
PHOTO_THRESH:    4
SL_URL:          sw00814305000msufc0307.fits
SUN_POSTN:       354.77d {+23h 39m 04s}   -2.26d {-02d 15' 51"}
SUN_DIST:         60.90 [deg]   Sun_angle= 3.8 [hr] (West of Sun)
MOON_POSTN:      326.64d {+21h 46m 32s}  -14.23d {-14d 13' 40"}
MOON_DIST:        47.09 [deg]
MOON_ILLUM:      7 [%]
GAL_COORDS:       60.63, -1.61 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      306.24, 43.62 [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:     Wed 14 Mar 18 22:38:17 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     814305,   Seg_Num: 0
GRB_RA:          297.8865d {+19h 51m 32.76s} (J2000),
                 298.0805d {+19h 52m 19.32s} (current),
                 297.3535d {+19h 49m 24.85s} (1950)
GRB_DEC:         +23.6240d {+23d 37' 26.3"} (J2000),
                 +23.6715d {+23d 40' 17.5"} (current),
                 +23.4949d {+23d 29' 41.7"} (1950)
GRB_ERROR:       2.1 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  18191 TJD;    73 DOY;   18/03/14
IMG_START_TIME:  80734.00 SOD {22:25:34.00} UT,   117.1 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       354.77d {+23h 39m 04s}   -2.26d {-02d 15' 50"}
SUN_DIST:         60.87 [deg]   Sun_angle= 3.8 [hr] (West of Sun)
MOON_POSTN:      326.64d {+21h 46m 33s}  -14.23d {-14d 13' 36"}
MOON_DIST:        47.07 [deg]
MOON_ILLUM:      7 [%]
GAL_COORDS:       60.65, -1.64 [deg] galactic lon,lat of the burst
ECL_COORDS:      306.29, 43.61 [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:     Wed 14 Mar 18 22:38:53 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     814305,   Seg_Num: 0
POINT_RA:        297.848d {+19h 51m 23s} (J2000)
POINT_DEC:       +23.622d {+23d 37' 20"} (J2000)
ROLL:            106.935d
IMG_START_DATE:  18191 TJD;    73 DOY;   18/03/14
IMG_START_TIME:  80924.88 SOD {22:28:44.88} UT,   307.9 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     542759345
X_OFFSET:        1001 [pixels]
Y_OFFSET:        663 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1161
Y_GRB_POS:       823
BINNING_INDEX:   1
IM_URL:          sw00814305000msuni0328.fits
SUN_POSTN:       354.77d {+23h 39m 04s}   -2.26d {-02d 15' 49"}
SUN_DIST:         60.91 [deg]   Sun_angle= 3.8 [hr] (West of Sun)
MOON_POSTN:      326.64d {+21h 46m 35s}  -14.23d {-14d 13' 31"}
MOON_DIST:        47.09 [deg]
MOON_ILLUM:      7 [%]
GAL_COORDS:       60.63, -1.61 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      306.24, 43.62 [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:     Wed 14 Mar 18 22:39:02 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     814305,   Seg_Num: 0
POINT_RA:        297.848d {+19h 51m 23s} (J2000)
POINT_DEC:       +23.622d {+23d 37' 20"} (J2000)
ROLL:            106.935d
IMG_START_DATE:  18191 TJD;    73 DOY;   18/03/14
IMG_START_TIME:  80924.88 SOD {22:28:44.88} UT,   307.9 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     542759345
X_OFFSET:        1001 [pixels]
Y_OFFSET:        663 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1161
Y_GRB_POS:       823
BINNING_INDEX:   1
IM_URL:          sw00814305000msuni0328.fits
SUN_POSTN:       354.77d {+23h 39m 04s}   -2.26d {-02d 15' 49"}
SUN_DIST:         60.91 [deg]   Sun_angle= 3.8 [hr] (West of Sun)
MOON_POSTN:      326.65d {+21h 46m 35s}  -14.23d {-14d 13' 30"}
MOON_DIST:        47.10 [deg]
MOON_ILLUM:      7 [%]
GAL_COORDS:       60.63, -1.61 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      306.24, 43.62 [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:     Wed 14 Mar 18 22:45:12 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     814305,   Seg_Num: 0
POINT_RA:        297.848d {+19h 51m 23s} (J2000)
POINT_DEC:       +23.622d {+23d 37' 20"} (J2000)
POINT_ROLL:      106.935d
IMG_START_DATE:  18191 TJD;    73 DOY;   18/03/14
IMG_START_TIME:  81478.86 SOD {22:37:58.86} UT,   861.9 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        4.401
N_STARS:         190
X_OFFSET:        441 [pixels]
Y_OFFSET:        103 [pixels]
X_MAX:           1880 [pixels]
Y_MAX:           1542 [pixels]
DET_THRESH:      18
PHOTO_THRESH:    10
SL_URL:          sw00814305000msufc0861.fits
SUN_POSTN:       354.77d {+23h 39m 05s}   -2.26d {-02d 15' 43"}
SUN_DIST:         60.91 [deg]   Sun_angle= 3.8 [hr] (West of Sun)
MOON_POSTN:      326.70d {+21h 46m 48s}  -14.21d {-14d 12' 43"}
MOON_DIST:        47.12 [deg]
MOON_ILLUM:      7 [%]
GAL_COORDS:       60.63, -1.61 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      306.24, 43.62 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 14 Mar 18 22:45:27 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     814305,   Seg_Num: 0
POINT_RA:        297.848d {+19h 51m 23s} (J2000)
POINT_DEC:       +23.622d {+23d 37' 20"} (J2000)
POINT_ROLL:      106.935d
IMG_START_DATE:  18191 TJD;    73 DOY;   18/03/14
IMG_START_TIME:  81478.86 SOD {22:37:58.86} UT,   861.9 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        4.401
N_STARS:         190
X_OFFSET:        441 [pixels]
Y_OFFSET:        103 [pixels]
X_MAX:           1880 [pixels]
Y_MAX:           1542 [pixels]
DET_THRESH:      18
PHOTO_THRESH:    10
SL_URL:          sw00814305000msufc0861.fits
SUN_POSTN:       354.77d {+23h 39m 05s}   -2.26d {-02d 15' 43"}
SUN_DIST:         60.91 [deg]   Sun_angle= 3.8 [hr] (West of Sun)
MOON_POSTN:      326.70d {+21h 46m 48s}  -14.21d {-14d 12' 41"}
MOON_DIST:        47.12 [deg]
MOON_ILLUM:      7 [%]
GAL_COORDS:       60.63, -1.61 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      306.24, 43.62 [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:     Wed 14 Mar 18 22:46:41 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     814305,   Seg_Num: 0
POINT_RA:        297.848d {+19h 51m 23s} (J2000)
POINT_DEC:       +23.622d {+23d 37' 20"} (J2000)
ROLL:            106.935d
IMG_START_DATE:  18191 TJD;    73 DOY;   18/03/14
IMG_START_TIME:  81478.86 SOD {22:37:58.86} UT,   861.9 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     542759899
X_OFFSET:        1000 [pixels]
Y_OFFSET:        662 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1160
Y_GRB_POS:       822
BINNING_INDEX:   1
IM_URL:          sw00814305000msuni0882.fits
SUN_POSTN:       354.77d {+23h 39m 05s}   -2.26d {-02d 15' 42"}
SUN_DIST:         60.91 [deg]   Sun_angle= 3.8 [hr] (West of Sun)
MOON_POSTN:      326.71d {+21h 46m 51s}  -14.21d {-14d 12' 32"}
MOON_DIST:        47.12 [deg]
MOON_ILLUM:      7 [%]
GAL_COORDS:       60.63, -1.61 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      306.24, 43.62 [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:     Wed 14 Mar 18 22:46:54 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     814305,   Seg_Num: 0
POINT_RA:        297.848d {+19h 51m 23s} (J2000)
POINT_DEC:       +23.622d {+23d 37' 20"} (J2000)
ROLL:            106.935d
IMG_START_DATE:  18191 TJD;    73 DOY;   18/03/14
IMG_START_TIME:  81478.86 SOD {22:37:58.86} UT,   861.9 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     542759899
X_OFFSET:        1000 [pixels]
Y_OFFSET:        662 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1160
Y_GRB_POS:       822
BINNING_INDEX:   1
IM_URL:          sw00814305000msuni0882.fits
SUN_POSTN:       354.77d {+23h 39m 05s}   -2.26d {-02d 15' 42"}
SUN_DIST:         60.91 [deg]   Sun_angle= 3.8 [hr] (West of Sun)
MOON_POSTN:      326.71d {+21h 46m 51s}  -14.21d {-14d 12' 30"}
MOON_DIST:        47.12 [deg]
MOON_ILLUM:      7 [%]
GAL_COORDS:       60.63, -1.61 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      306.24, 43.62 [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 #22492
P.A. Evans (U. Leicester) reports on behalf of the Swift-XRT team:
Using promptly downlinked XRT event data for GRB 180314B, we find an enhanced XRT position of the afterglow: RA, Dec: 297.8867, 23.6243 which is equivalent to:
```
   RA (J2000)  = 19 51 32.82
   Dec (J2000) = +23 37 27.4
```
with an uncertainty of 1.9 arcseconds (radius, 90% confidence). Analysis of the promptly available data is online at http://www.swift.ac.uk/sper/814305.
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 #22494
A.P. Beardmore, P.A. Evans, M.R. Goad and J.P. Osborne (U. Leicester) report on behalf of the Swift-XRT team.
Using 2454 s of XRT Photon Counting mode data and 2 UVOT images for GRB 180314B, 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 = 297.88665, +23.62406 which is equivalent to:
```
RA (J2000): 19h 51m 32.80s
Dec (J2000): +23d 37' 26.6"
```
with an uncertainty of 1.5 arcsec (radius, 90% confidence).
This position may be improved as more data are received. The latest position can be viewed at http://www.swift.ac.uk/xrt_positions. Position enhancement is described by Goad et al. (2007, A&A, 476, 1401) and Evans et al. (2009, MNRAS, 397, 1177).
This circular was automatically generated, and is an official product of the Swift-XRT team.
GCN Circular #22495
J.A. Kennea (PSU), P.A. Evans (U. Leicester), S.L. Gibson (U. Leicester), J.P. Osborne (U. Leicester), A. Melandri (INAF-OAB), V. D'Elia (ASDC), B. Sbarufatti (INAF-OAB/PSU), D.N. Burrows (PSU) and P. D'Avanzo report on behalf of the Swift-XRT team:
We have analysed 6.4 ks of XRT data for GRB 180314B (D'Avanzo et al. GCN Circ. 22491), from 102 s to 19.8 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. 22492).
The light curve can be modelled with an initial power-law decay with an index of alpha=0.08 (+0.09, -0.07), followed by a break at T+1503 s to an alpha of 1.42 (+/-0.08).
A spectrum formed from the PC mode data can be fitted with an absorbed power-law with a photon spectral index of 2.55 (+0.21, -0.20). The best-fitting absorption column is 2.14 (+0.29, -0.27) x 10^22 cm^-2, in excess of the Galactic value of 8.9 x 10^21 cm^-2 (Willingale et al. 2013). The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 4.8 x 10^-11 (1.9 x 10^-10) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
```
Total column:	     2.14 (+0.29, -0.27) x 10^22 cm^-2
Galactic foreground: 8.9 x 10^21 cm^-2
Excess significance: 7.6 sigma
Photon index:	     2.55 (+0.21, -0.20)
```
If the light curve continues to decay with a power-law decay index of 1.42, the count rate at T+24 hours will be 5.5 x 10^-3 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 2.7 x 10^-13 (1.1 x 10^-12) erg cm^-2 s^-1.
The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00814305.
This circular is an official product of the Swift-XRT team.
GCN Circular #22496
S. R. Oates (U.Warwick) and P. D'Avanzo (INAF-OAB) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 180314B 94 s after the BAT trigger (D'Avanzo et al., GCN Circ. 22491). No optical afterglow consistent with the XRT position (Beardmore et al. GCN Circ. 22494) 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            94          244          147         >19.6
u_FC               308          558          246         >19.3
white               94         7249          666         >19.7
v                  638         7660          607         >18.4
b                  563        11580          471         >19.3
u                  308         8274          834         >19.6
w1                 687         8070          588         >19.5
m2                 662         7865          607         >20.4
w2                 614         7455          607         >20.5
```
The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 2.21 in the direction of the burst (Schlegel et al. 1998).
GCN Circular #22497
E. Mazaeva (IKI), A. Pozanenko (IKI), A. Novichonok (KIAM, PetrSU), I. Nikolenko (CrAO), A. Volnova (IKI), I. Molotov (KIAM) report on behalf of larger GRB follow-up collaboration:
We observed the field of Swift GRB 180314B (D'Avanzo et al., GCN 22491) with Zeiss-1000/Koshka (CrAO) telescope starting March 15 (UT) 01:55:39. We obtained several images in R-filter. We do not detect any source within enhanced Swift-XRT position (Beardmore et al., GCN 22494). Preliminary photometry of the field is following.
```
Date        UT start  t-T0      Filter Exp.   OT    Err.  UL
                       (mid, days)    (s)

2018-03-15  01:55:39  0.15459    R     7*180  n/d   n/d   22.2
```
The photometry is based on nearby USNO-B1.0 stars
```
USNO-B1_id   R1
1135-0426232 15.02
1135-0426125 15.64
1136-0433074 16.46
```
GCN Circular #22498
S. D. Barthelmy (GSFC), J. R. Cummings (CPI), P. D'Avanzo (INAF-OAB), H. A. Krimm (NSF/USRA), A. Y. Lien (GSFC/UMBC), C. B. Markwardt (GSFC), D. M. Palmer (LANL), T. Sakamoto (AGU), M. Stamatikos (OSU), T. N. Ukwatta (LANL) (i.e. the Swift-BAT team):
Using the data set from T-240 to T+963 sec from the recent telemetry downlink, we report further analysis of BAT GRB 180314B (trigger #814305) (D'Avanzo et al., GCN Circ. 22491). The BAT ground-calculated position is RA, Dec = 297.855, 23.634 deg which is
```
  RA(J2000)  =  19h 51m 25.3s
  Dec(J2000) = +23d 38' 04.1"
```
with an uncertainty of 2.0 arcmin, (radius, sys+stat, 90% containment). The partial coding was 66%.
The mask-weighted light curve shows a multi-peaked structure that starts at ~ T-50 sec and ends at ~ T+35 s. The main peak occurs at ~ T0. T90 (15-350 keV) is 73.0 +- 9.4 sec (estimated error including systematics).
The time-averaged spectrum from T-47.6 to T+34.4 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 2.41 +- 0.25. The fluence in the 15-150 keV band is 9.6 +- 1.4 x 10^-7 erg/cm2. The 1-sec peak photon flux measured from T-0.57 sec in the 15-150 keV band is 1.1 +- 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/814305/BA/
GCN Circular #22499
Alan M. Watson (UNAM), Nat Butler (ASU), Alexander Kutyrev (GSFC), William H. Lee (UNAM), Michael G. Richer (UNAM), Ori Fox (STScI), J. Xavier Prochaska (UCSC), Josh Bloom (UCB), Antonino Cucchiara (UVI), Eleonora Troja (GSFC), Owen Littlejohns (ASU), Enrico Ramirez-Ruiz (UCSC), Jes=FAs Gonz=E1lez (UNAM), Carlos Rom=E1n-Z=FA=F1iga (UNAM), Harvey Moseley (GSFC), John Capone (UMD), V. Zach Golkhou (U. Wash.), and Vicki Toy (UMD) report:
We observed the field of GRB 180314B (D'Avanzo et al., GCN 22491) with the Reionization and Transients Infrared Camera (RATIR; www.ratir.org) on the 1.5m Harold Johnson Telescope at the Observatorio Astron=F3mico Nacional on Sierra San Pedro M=E1rtir from 2018/03 15.46 to 2018/03 15.52 UTC (12.55 to 13.99 hours after the BAT trigger), obtaining a total of 1.07 hours exposure in the r and i bands.
For a source within the Swift-XRT error circle, in comparison with the USNO-B1 and 2MASS catalogs, we obtain the following 3-sigma upper limits:
```
 r	> 23.29
 i	> 22.90
```
These magnitudes are in the AB system and are not corrected for Galactic extinction in the direction of the GRB.
We thank the staff of the Observatorio Astron=F3mico Nacional in San Pedro M=E1rtir.

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Jochen Greiner, last update: 16-Mar-2018 [Disclaimer]