Gamma-ray Burst 181110A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

none

Results of Observations

GCN/BACODINE POSITION NOTICE

 
TITLE:           GCN/SWIFT NOTICE 
NOTICE_DATE:     Sat 10 Nov 18 08:43:54 UT 
NOTICE_TYPE:     Swift-BAT GRB Position 
TRIGGER_NUM:     871316,   Seg_Num: 0 
GRB_RA:          302.342d {+20h 09m 22s} (J2000), 
                 302.651d {+20h 10m 36s} (current), 
                 301.524d {+20h 06m 06s} (1950) 
GRB_DEC:         -36.903d {-36d 54' 08"} (J2000), 
                 -36.846d {-36d 50' 45"} (current), 
                 -37.050d {-37d 02' 58"} (1950) 
GRB_ERROR:       3.00 [arcmin radius, statistical only] 
GRB_INTEN:       3039 [cnts]    Image_Peak=162 [image_cnts] 
TRIGGER_DUR:     1.024 [sec]  
TRIGGER_INDEX:   146     E_range: 25-100 keV 
BKG_INTEN:       18536 [cnts] 
BKG_TIME:        31394.10 SOD {08:43:14.10} UT 
BKG_DUR:         8 [sec] 
GRB_DATE:        18432 TJD;   314 DOY;   18/11/10 
GRB_TIME:        31411.31 SOD {08:43:31.31} UT 
GRB_PHI:         165.64 [deg] 
GRB_THETA:        11.09 [deg] 
SOLN_STATUS:     0x3 
RATE_SIGNIF:     12.88 [sigma] 
IMAGE_SIGNIF:    7.48 [sigma] 
MERIT_PARAMS:     +1  +0  +0  +0  +2  -2  +0  +0 -34  +0  
SUN_POSTN:       225.44d {+15h 01m 45s}  -17.16d {-17d 09' 50"} 
SUN_DIST:         69.74 [deg]   Sun_angle= -5.1 [hr] (East of Sun) 
MOON_POSTN:      259.46d {+17h 17m 51s}  -19.96d {-19d 57' 46"} 
MOON_DIST:        41.14 [deg] 
MOON_ILLUM:      8 [%] 
GAL_COORDS:        4.23,-30.74 [deg] galactic lon,lat of the burst (or transient) 
ECL_COORDS:      296.48,-16.39 [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 = 105.70,16.69 [deg].

red DSS finding chart ps-file

GCN NOTICE

 
TITLE:           GCN/SWIFT NOTICE 
NOTICE_DATE:     Sat 10 Nov 18 08:45:00 UT 
NOTICE_TYPE:     Swift-XRT Position 
TRIGGER_NUM:     871316,   Seg_Num: 0 
GRB_RA:          302.3180d {+20h 09m 16.31s} (J2000), 
                 302.6261d {+20h 10m 30.25s} (current), 
                 301.4996d {+20h 06m 00.09s} (1950) 
GRB_DEC:         -36.8957d {-36d 53' 44.5"} (J2000), 
                 -36.8393d {-36d 50' 21.5"} (current), 
                 -37.0429d {-37d 02' 34.2"} (1950) 
GRB_ERROR:       5.1 [arcsec radius, statistical plus systematic, 90% containment] 
GRB_INTEN:       5.82e-08 [erg/cm2/sec] 
GRB_SIGNIF:      9.16 [sigma] 
IMG_START_DATE:  18432 TJD;   314 DOY;   18/11/10 
IMG_START_TIME:  31475.29 SOD {08:44:35.29} UT,   64.0 [sec] since BAT Trigger Time 
TAM[0-3]:        327.66 237.21 261.58 243.37 
AMPLIFIER:       2 
WAVEFORM:        134 
SUN_POSTN:       225.44d {+15h 01m 45s}  -17.16d {-17d 09' 51"} 
SUN_DIST:         69.73 [deg]   Sun_angle= -5.1 [hr] (East of Sun) 
MOON_POSTN:      259.47d {+17h 17m 53s}  -19.96d {-19d 57' 51"} 
MOON_DIST:        41.11 [deg] 
MOON_ILLUM:      8 [%] 
GAL_COORDS:        4.23,-30.72 [deg] galactic lon,lat of the burst 
ECL_COORDS:      296.46,-16.38 [deg] ecliptic lon,lat of the burst 
COMMENTS:        SWIFT-XRT Coordinates.   
COMMENTS:        The XRT position is 1.24 arcmin from the BAT position.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 10 Nov 18 08:45:12 UT
NOTICE_TYPE:     Swift-XRT Processed Image
TRIGGER_NUM:     871316,   Seg_Num: 0
GRB_RA:          302.3180d {+20h 09m 16.3s} (J2000),
                 302.6261d {+20h 10m 30.2s} (current),
                 301.4996d {+20h 06m 00.0s} (1950)
GRB_DEC:         -36.8957d {-36d 53' 44.5"} (J2000),
                 -36.8393d {-36d 50' 21.5"} (current),
                 -37.0429d {-37d 02' 34.2"} (1950)
GRB_ERROR:       5.0 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       84 [cnts]
IMG_START_DATE:  18432 TJD;   314 DOY;   18/11/10
IMG_START_TIME:  31475.29 SOD {08:44:35.29} UT,   64.0 [sec] since BAT Trigger Time
CENTROID_X:      274.08,  raw= 274  [pixels]
CENTROID_Y:      287.75,  raw= 288  [pixels]
ROLL:            263.51 [deg]
GAIN:            1
MODE:            2, Short Image mode
WAVEFORM:        134
EXPO_TIME:       0.10 [sec]
GRB_POS_XRT_Y:   -25.09
GRB_POS_XRT_Z:   -76.17
IMAGE_URL:       sw00871316000msxps_rw.img
SUN_POSTN:       225.44d {+15h 01m 45s}  -17.16d {-17d 09' 51"}
SUN_DIST:         69.73 [deg]   Sun_angle= -5.1 [hr] (East of Sun)
MOON_POSTN:      259.47d {+17h 17m 54s}  -19.96d {-19d 57' 52"}
MOON_DIST:        41.11 [deg]
MOON_ILLUM:      8 [%]
GAL_COORDS:        4.23,-30.72 [deg] galactic lon,lat of the burst
ECL_COORDS:      296.46,-16.38 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Processed Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 10 Nov 18 08:45:09 UT
NOTICE_TYPE:     Swift-XRT Image
TRIGGER_NUM:     871316,   Seg_Num: 0
GRB_RA:          302.3180d {+20h 09m 16.3s} (J2000),
                 302.6261d {+20h 10m 30.2s} (current),
                 301.4996d {+20h 06m 00.0s} (1950)
GRB_DEC:         -36.8957d {-36d 53' 44.5"} (J2000),
                 -36.8393d {-36d 50' 21.5"} (current),
                 -37.0429d {-37d 02' 34.2"} (1950)
GRB_ERROR:       5.0 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       84 [cnts]
IMG_START_DATE:  18432 TJD;   314 DOY;   18/11/10
IMG_START_TIME:  31475.29 SOD {08:44:35.29} UT,   64.0 [sec] since BAT Trigger Time
CENTROID_X:      274.08,  raw= 274  [pixels]
CENTROID_Y:      287.75,  raw= 288  [pixels]
ROLL:            263.51 [deg]
GAIN:            1
MODE:            2, Short Image mode
WAVEFORM:        134
EXPO_TIME:       0.10 [sec]
GRB_POS_XRT_Y:   -25.09
GRB_POS_XRT_Z:   -76.17
IMAGE_URL:       sw00871316000msxps_rw.img
SUN_POSTN:       225.44d {+15h 01m 45s}  -17.16d {-17d 09' 51"}
SUN_DIST:         69.73 [deg]   Sun_angle= -5.1 [hr] (East of Sun)
MOON_POSTN:      259.47d {+17h 17m 53s}  -19.96d {-19d 57' 51"}
MOON_DIST:        41.11 [deg]
MOON_ILLUM:      8 [%]
GAL_COORDS:        4.23,-30.72 [deg] galactic lon,lat of the burst
ECL_COORDS:      296.46,-16.38 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 10 Nov 18 08:47:19 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     871316,   Seg_Num: 0
GRB_RA:          302.342d {+20h 09m 22s} (J2000),
                 302.651d {+20h 10m 36s} (current),
                 301.524d {+20h 06m 06s} (1950)
GRB_DEC:         -36.903d {-36d 54' 08"} (J2000),
                 -36.846d {-36d 50' 45"} (current),
                 -37.050d {-37d 02' 58"} (1950)
GRB_DATE:        18432 TJD;   314 DOY;   18/11/10
GRB_TIME:        31411.31 SOD {08:43:31.31} UT
TRIGGER_INDEX:   146
GRB_PHI:         165.64 [deg]
GRB_THETA:        11.09 [deg]
DELTA_TIME:      38.00 [sec]
TRIGGER_DUR:     1.024 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     12.88 [sigma]
IMAGE_SIGNIF:    7.48 [sigma]
LC_URL:          sw00871316000msb.lc
SUN_POSTN:       225.44d {+15h 01m 46s}  -17.16d {-17d 09' 52"}
SUN_DIST:         69.74 [deg]   Sun_angle= -5.1 [hr] (East of Sun)
MOON_POSTN:      259.49d {+17h 17m 58s}  -19.97d {-19d 58' 01"}
MOON_DIST:        41.11 [deg]
MOON_ILLUM:      8 [%]
GAL_COORDS:        4.23,-30.74 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      296.48,-16.39 [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 = 105.70,16.69 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 10 Nov 18 08:48:29 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     871316,   Seg_Num: 0
POINT_RA:        302.346d {+20h 09m 23s} (J2000)
POINT_DEC:       -36.902d {-36d 54' 05"} (J2000)
POINT_ROLL:      263.508d
IMG_START_DATE:  18432 TJD;   314 DOY;   18/11/10
IMG_START_TIME:  31483.67 SOD {08:44:43.67} UT,   72.4 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        4.814
N_STARS:         114
X_OFFSET:        488 [pixels]
Y_OFFSET:        528 [pixels]
X_MAX:           1447 [pixels]
Y_MAX:           1487 [pixels]
DET_THRESH:      18
PHOTO_THRESH:    11
SL_URL:          sw00871316000msufc0072.fits
SUN_POSTN:       225.44d {+15h 01m 46s}  -17.17d {-17d 09' 53"}
SUN_DIST:         69.74 [deg]   Sun_angle= -5.1 [hr] (East of Sun)
MOON_POSTN:      259.50d {+17h 18m 01s}  -19.97d {-19d 58' 06"}
MOON_DIST:        41.10 [deg]
MOON_ILLUM:      8 [%]
GAL_COORDS:        4.23,-30.74 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      296.49,-16.39 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 10 Nov 18 08:48:42 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     871316,   Seg_Num: 0
POINT_RA:        302.346d {+20h 09m 23s} (J2000)
POINT_DEC:       -36.902d {-36d 54' 05"} (J2000)
POINT_ROLL:      263.508d
IMG_START_DATE:  18432 TJD;   314 DOY;   18/11/10
IMG_START_TIME:  31483.67 SOD {08:44:43.67} UT,   72.4 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        4.814
N_STARS:         114
X_OFFSET:        488 [pixels]
Y_OFFSET:        528 [pixels]
X_MAX:           1447 [pixels]
Y_MAX:           1487 [pixels]
DET_THRESH:      18
PHOTO_THRESH:    11
SL_URL:          sw00871316000msufc0072.fits
SUN_POSTN:       225.44d {+15h 01m 46s}  -17.17d {-17d 09' 53"}
SUN_DIST:         69.74 [deg]   Sun_angle= -5.1 [hr] (East of Sun)
MOON_POSTN:      259.51d {+17h 18m 01s}  -19.97d {-19d 58' 07"}
MOON_DIST:        41.10 [deg]
MOON_ILLUM:      8 [%]
GAL_COORDS:        4.23,-30.74 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      296.49,-16.39 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 10 Nov 18 08:50:32 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     871316,   Seg_Num: 0
POINT_RA:        302.346d {+20h 09m 23s} (J2000)
POINT_DEC:       -36.902d {-36d 54' 05"} (J2000)
ROLL:            263.508d
IMG_START_DATE:  18432 TJD;   314 DOY;   18/11/10
IMG_START_TIME:  31483.67 SOD {08:44:43.67} UT,   72.4 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     563532305
X_OFFSET:        955 [pixels]
Y_OFFSET:        845 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1115
Y_GRB_POS:       1005
BINNING_INDEX:   1
IM_URL:          sw00871316000msuni0094.fits
SUN_POSTN:       225.44d {+15h 01m 46s}  -17.17d {-17d 09' 54"}
SUN_DIST:         69.74 [deg]   Sun_angle= -5.1 [hr] (East of Sun)
MOON_POSTN:      259.52d {+17h 18m 05s}  -19.97d {-19d 58' 15"}
MOON_DIST:        41.09 [deg]
MOON_ILLUM:      8 [%]
GAL_COORDS:        4.23,-30.74 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      296.49,-16.39 [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:     Sat 10 Nov 18 08:50:42 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     871316,   Seg_Num: 0
POINT_RA:        302.346d {+20h 09m 23s} (J2000)
POINT_DEC:       -36.902d {-36d 54' 05"} (J2000)
ROLL:            263.508d
IMG_START_DATE:  18432 TJD;   314 DOY;   18/11/10
IMG_START_TIME:  31483.67 SOD {08:44:43.67} UT,   72.4 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     563532305
X_OFFSET:        955 [pixels]
Y_OFFSET:        845 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1115
Y_GRB_POS:       1005
BINNING_INDEX:   1
IM_URL:          sw00871316000msuni0094.fits
SUN_POSTN:       225.44d {+15h 01m 46s}  -17.17d {-17d 09' 55"}
SUN_DIST:         69.74 [deg]   Sun_angle= -5.1 [hr] (East of Sun)
MOON_POSTN:      259.52d {+17h 18m 06s}  -19.97d {-19d 58' 16"}
MOON_DIST:        41.09 [deg]
MOON_ILLUM:      8 [%]
GAL_COORDS:        4.23,-30.74 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      296.49,-16.39 [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:     Sat 10 Nov 18 08:52:53 UT
NOTICE_TYPE:     Swift-UVOT Position
TRIGGER_NUM:     871316,   Seg_Num: 0
GRB_RA:          302.3178d {+20h 09m 16.27s} (J2000),
                 302.6259d {+20h 10m 30.20s} (current),
                 301.4994d {+20h 06m 00.14s} (1950)
GRB_DEC:         -36.8966d {-36d 53' 47.7"} (J2000),
                 -36.8402d {-36d 50' 24.8"} (current),
                 -37.0438d {-37d 02' 37.5"} (1950)
GRB_ERROR:       0.6 [arcsec radius, statistical only]
GRB_MAG:         18.38 +/- 0.14 [mag]
FILTER:          10, White
IMG_START_DATE:  18432 TJD;   314 DOY;   18/11/10
IMG_START_TIME:  31480.00 SOD {08:44:40.00} UT,   68.7 [sec] since BAT Trigger Time
SUN_POSTN:       225.44d {+15h 01m 47s}  -17.17d {-17d 09' 56"}
SUN_DIST:         69.72 [deg]   Sun_angle= -5.1 [hr] (East of Sun)
MOON_POSTN:      259.54d {+17h 18m 11s}  -19.97d {-19d 58' 26"}
MOON_DIST:        41.05 [deg]
MOON_ILLUM:      8 [%]
GAL_COORDS:        4.23,-30.72 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      296.46,-16.38 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT UVOT Position Notice.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        The UVOT position is 3.2 arcsec from the XRT position.  
COMMENTS:        Result based on Genie data.  
COMMENTS:        Notice generated automatically.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 10 Nov 18 08:56:50 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     871316,   Seg_Num: 0
POINT_RA:        302.346d {+20h 09m 23s} (J2000)
POINT_DEC:       -36.900d {-36d 54' 00"} (J2000)
POINT_ROLL:      263.506d
IMG_START_DATE:  18432 TJD;   314 DOY;   18/11/10
IMG_START_TIME:  31695.60 SOD {08:48:15.60} UT,   284.3 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        1.149
N_STARS:         66
X_OFFSET:        635 [pixels]
Y_OFFSET:        525 [pixels]
X_MAX:           1594 [pixels]
Y_MAX:           1484 [pixels]
DET_THRESH:      9
PHOTO_THRESH:    4
SL_URL:          sw00871316000msufc0284.fits
SUN_POSTN:       225.45d {+15h 01m 47s}  -17.17d {-17d 09' 59"}
SUN_DIST:         69.74 [deg]   Sun_angle= -5.1 [hr] (East of Sun)
MOON_POSTN:      259.58d {+17h 18m 19s}  -19.98d {-19d 58' 43"}
MOON_DIST:        41.04 [deg]
MOON_ILLUM:      8 [%]
GAL_COORDS:        4.23,-30.74 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      296.49,-16.39 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 10 Nov 18 08:57:08 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     871316,   Seg_Num: 0
POINT_RA:        302.346d {+20h 09m 23s} (J2000)
POINT_DEC:       -36.900d {-36d 54' 00"} (J2000)
POINT_ROLL:      263.506d
IMG_START_DATE:  18432 TJD;   314 DOY;   18/11/10
IMG_START_TIME:  31695.60 SOD {08:48:15.60} UT,   284.3 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        1.149
N_STARS:         66
X_OFFSET:        635 [pixels]
Y_OFFSET:        525 [pixels]
X_MAX:           1594 [pixels]
Y_MAX:           1484 [pixels]
DET_THRESH:      9
PHOTO_THRESH:    4
SL_URL:          sw00871316000msufc0284.fits
SUN_POSTN:       225.45d {+15h 01m 47s}  -17.17d {-17d 10' 00"}
SUN_DIST:         69.74 [deg]   Sun_angle= -5.1 [hr] (East of Sun)
MOON_POSTN:      259.58d {+17h 18m 20s}  -19.98d {-19d 58' 44"}
MOON_DIST:        41.03 [deg]
MOON_ILLUM:      8 [%]
GAL_COORDS:        4.23,-30.74 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      296.49,-16.39 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 10 Nov 18 08:58:17 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     871316,   Seg_Num: 0
POINT_RA:        302.346d {+20h 09m 23s} (J2000)
POINT_DEC:       -36.900d {-36d 54' 00"} (J2000)
ROLL:            263.506d
IMG_START_DATE:  18432 TJD;   314 DOY;   18/11/10
IMG_START_TIME:  31695.60 SOD {08:48:15.60} UT,   284.3 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     563532517
X_OFFSET:        955 [pixels]
Y_OFFSET:        845 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1115
Y_GRB_POS:       1005
BINNING_INDEX:   1
IM_URL:          sw00871316000msuni0306.fits
SUN_POSTN:       225.45d {+15h 01m 48s}  -17.17d {-17d 10' 00"}
SUN_DIST:         69.74 [deg]   Sun_angle= -5.1 [hr] (East of Sun)
MOON_POSTN:      259.59d {+17h 18m 22s}  -19.98d {-19d 58' 49"}
MOON_DIST:        41.03 [deg]
MOON_ILLUM:      8 [%]
GAL_COORDS:        4.23,-30.74 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      296.49,-16.39 [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:     Sat 10 Nov 18 08:58:28 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     871316,   Seg_Num: 0
POINT_RA:        302.346d {+20h 09m 23s} (J2000)
POINT_DEC:       -36.900d {-36d 54' 00"} (J2000)
ROLL:            263.506d
IMG_START_DATE:  18432 TJD;   314 DOY;   18/11/10
IMG_START_TIME:  31695.60 SOD {08:48:15.60} UT,   284.3 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     563532517
X_OFFSET:        955 [pixels]
Y_OFFSET:        845 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1115
Y_GRB_POS:       1005
BINNING_INDEX:   1
IM_URL:          sw00871316000msuni0306.fits
SUN_POSTN:       225.45d {+15h 01m 48s}  -17.17d {-17d 10' 00"}
SUN_DIST:         69.74 [deg]   Sun_angle= -5.1 [hr] (East of Sun)
MOON_POSTN:      259.60d {+17h 18m 23s}  -19.98d {-19d 58' 50"}
MOON_DIST:        41.02 [deg]
MOON_ILLUM:      8 [%]
GAL_COORDS:        4.23,-30.74 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      296.49,-16.39 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        The GRB Position came from the XRT Position Command.  
COMMENTS:        The image has 2x2 binning (compression).  
COMMENTS:        All 4 attachments are included.

GCN Circular #23413
P. A. Evans (U Leicester), K. L. Page (U Leicester) and T. Sakamoto (AGU) report on behalf of the Neil Gehrels Swift Observatory Team:
At 08:43:31 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 181110A (trigger=871316). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 302.342, -36.903 which is
```
   RA(J2000) = 20h 09m 22s
   Dec(J2000) = -36d 54' 08"
```
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 150 sec. The peak count rate was ~3870 counts/sec (15-350 keV), at ~10 sec after the trigger.
The XRT began observing the field at 08:44:35.2 UT, 64.0 seconds after the BAT trigger. Using promptly downlinked data we find a bright, uncatalogued X-ray source located at RA, Dec 302.31711, -36.89632 which is equivalent to:
```
   RA(J2000)  = 20h 09m 16.11s
   Dec(J2000) = -36d 53' 46.8"
```
with an uncertainty of 3.7 arcseconds (radius, 90% containment). This location is 75 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. No spectrum from the promptly downlinked event data is yet available to determine the column density.
The initial flux in the 0.1 s image was 5.82e-08 erg cm^-2 s^-1 (0.2-10 keV).
UVOT took a finding chart exposure of 150 seconds with the White filter starting 72 seconds after the BAT trigger. There is a candidate afterglow in the rapidly available 2.7'x2.7' sub-image at
```
  RA(J2000)  =	20:09:16.28 = 302.31782
  DEC(J2000) = -36:53:47.8  = -36.89661
```
with a 90%-confidence error radius of about 0.63 arc sec. This position is 3.3 arc sec. from the center of the XRT error circle. The estimated magnitude is 18.39 with a 1-sigma error of about 0.15. No correction has been made for the expected extinction corresponding to E(B-V) of 0.07.
Burst Advocate for this burst is P. A. Evans (pae9 AT star.le.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:     Sat 10 Nov 18 09:04:49 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     871316,   Seg_Num: 0
POINT_RA:        302.345d {+20h 09m 23s} (J2000)
POINT_DEC:       -36.900d {-36d 54' 00"} (J2000)
POINT_ROLL:      263.507d
IMG_START_DATE:  18432 TJD;   314 DOY;   18/11/10
IMG_START_TIME:  32272.52 SOD {08:57:52.52} UT,   861.2 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        4.054
N_STARS:         190
X_OFFSET:        395 [pixels]
Y_OFFSET:        285 [pixels]
X_MAX:           1834 [pixels]
Y_MAX:           1724 [pixels]
DET_THRESH:      17
PHOTO_THRESH:    9
SL_URL:          sw00871316000msufc0861.fits
SUN_POSTN:       225.45d {+15h 01m 49s}  -17.17d {-17d 10' 04"}
SUN_DIST:         69.73 [deg]   Sun_angle= -5.1 [hr] (East of Sun)
MOON_POSTN:      259.65d {+17h 18m 37s}  -19.99d {-19d 59' 18"}
MOON_DIST:        40.97 [deg]
MOON_ILLUM:      8 [%]
GAL_COORDS:        4.23,-30.74 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      296.49,-16.39 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 10 Nov 18 09:05:04 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     871316,   Seg_Num: 0
POINT_RA:        302.345d {+20h 09m 23s} (J2000)
POINT_DEC:       -36.900d {-36d 54' 00"} (J2000)
POINT_ROLL:      263.507d
IMG_START_DATE:  18432 TJD;   314 DOY;   18/11/10
IMG_START_TIME:  32272.52 SOD {08:57:52.52} UT,   861.2 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        4.054
N_STARS:         190
X_OFFSET:        395 [pixels]
Y_OFFSET:        285 [pixels]
X_MAX:           1834 [pixels]
Y_MAX:           1724 [pixels]
DET_THRESH:      17
PHOTO_THRESH:    9
SL_URL:          sw00871316000msufc0861.fits
SUN_POSTN:       225.45d {+15h 01m 49s}  -17.17d {-17d 10' 05"}
SUN_DIST:         69.73 [deg]   Sun_angle= -5.1 [hr] (East of Sun)
MOON_POSTN:      259.66d {+17h 18m 37s}  -19.99d {-19d 59' 19"}
MOON_DIST:        40.97 [deg]
MOON_ILLUM:      8 [%]
GAL_COORDS:        4.23,-30.74 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      296.49,-16.39 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 10 Nov 18 09:06:20 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     871316,   Seg_Num: 0
POINT_RA:        302.345d {+20h 09m 23s} (J2000)
POINT_DEC:       -36.900d {-36d 54' 00"} (J2000)
ROLL:            263.507d
IMG_START_DATE:  18432 TJD;   314 DOY;   18/11/10
IMG_START_TIME:  32272.52 SOD {08:57:52.52} UT,   861.2 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     563533094
X_OFFSET:        954 [pixels]
Y_OFFSET:        844 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1114
Y_GRB_POS:       1004
BINNING_INDEX:   1
IM_URL:          sw00871316000msuni0883.fits
SUN_POSTN:       225.45d {+15h 01m 49s}  -17.17d {-17d 10' 06"}
SUN_DIST:         69.73 [deg]   Sun_angle= -5.1 [hr] (East of Sun)
MOON_POSTN:      259.67d {+17h 18m 40s}  -19.99d {-19d 59' 25"}
MOON_DIST:        40.96 [deg]
MOON_ILLUM:      8 [%]
GAL_COORDS:        4.23,-30.74 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      296.49,-16.39 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Image.  
COMMENTS:        The GRB Position came from the Window Position in the Mode Command.  
COMMENTS:        The image has 2x2 binning (compression).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 10 Nov 18 09:05:25 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     871316,   Seg_Num: 0
GRB_RA:          302.3174d {+20h 09m 16.17s} (J2000),
                 302.6255d {+20h 10m 30.10s} (current),
                 301.4990d {+20h 06m 00.24s} (1950)
GRB_DEC:         -36.8965d {-36d 53' 47.4"} (J2000),
                 -36.8401d {-36d 50' 24.4"} (current),
                 -37.0437d {-37d 02' 37.1"} (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:  18432 TJD;   314 DOY;   18/11/10
IMG_START_TIME:  31758.00 SOD {08:49:18.00} UT,   346.7 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       225.45d {+15h 01m 49s}  -17.17d {-17d 10' 05"}
SUN_DIST:         69.71 [deg]   Sun_angle= -5.1 [hr] (East of Sun)
MOON_POSTN:      259.66d {+17h 18m 38s}  -19.99d {-19d 59' 21"}
MOON_DIST:        40.95 [deg]
MOON_ILLUM:      8 [%]
GAL_COORDS:        4.23,-30.72 [deg] galactic lon,lat of the burst
ECL_COORDS:      296.46,-16.38 [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 0.11% < P(seren) < 0.58%.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 10 Nov 18 09:06:32 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     871316,   Seg_Num: 0
POINT_RA:        302.345d {+20h 09m 23s} (J2000)
POINT_DEC:       -36.900d {-36d 54' 00"} (J2000)
ROLL:            263.507d
IMG_START_DATE:  18432 TJD;   314 DOY;   18/11/10
IMG_START_TIME:  32272.52 SOD {08:57:52.52} UT,   861.2 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     563533094
X_OFFSET:        954 [pixels]
Y_OFFSET:        844 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1114
Y_GRB_POS:       1004
BINNING_INDEX:   1
IM_URL:          sw00871316000msuni0883.fits
SUN_POSTN:       225.45d {+15h 01m 49s}  -17.17d {-17d 10' 06"}
SUN_DIST:         69.73 [deg]   Sun_angle= -5.1 [hr] (East of Sun)
MOON_POSTN:      259.67d {+17h 18m 41s}  -19.99d {-19d 59' 26"}
MOON_DIST:        40.96 [deg]
MOON_ILLUM:      8 [%]
GAL_COORDS:        4.23,-30.74 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      296.49,-16.39 [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 #23414
M. Yamanaka, M. Kawabata, K. S. Kawabata (Hiroshima Univ.) report on behalf of Kanata team:
We performed optical imaging polarimetry to the field of the GRB 181110A (Evans et al. GCN 23413) from 2018-11-10 08:44:48 UT (77 seconds after the trigger) with HOWPol attached to the 1.5-m Kanata telescope at Higashi-Hiroshima Observatory, Japan. Although the first frames were severely affected by bright twilight sky, in later frames a possible bright optical counterpart of the GRB appeared at the position consistent with the Swift-UVOT observation (Evans et al. GCN 23413). The magnitude of the counterpart was R~14 mag (USNO B1.0) at 940 seconds after the trigger, suggesting it brightened by ~4 mag within ~15 minutes. It further brightened slightly (by a few 0.1 mag) and then declined smoothly. Further analysis is ongoing.
GCN Circular #23415
K. L. Murata, R. Itoh, Y. Tachibana, S. Harita, K. Morita, K. Shiraishi, K. Iida, M. Oeda, M. Niwano, R. Adachi, Y. Yatsu, and N. Kawai (Tokyo Tech) report on behalf of the MITSuME collaboration
We searched for the optical counterpart of GRB 181110A (Evans et al., GCN Circular #23413) with the optical three color (g', Rc, and Ic) CCD cameras attached to the MITSuME 50 cm telescope of AkenoObservatory, Yamanashi, Japan.
The observation for the position of the 1st GCN of this trigger (trigger #871316) started on 08:44:56 UT which corresponds to 85 sec after the trigger.
Here we report the result of the images after 08:55:15 UT. We detected the point source at the position consistent with the Swift/UVOT observation (Evans et al., GCN Circular #23413) and the Kanata observation (Yamanaka et al., GCN Circular # 23414). The measured magnitudes are listed as follows.
```
T0+[min]    MID-UT      T-EXP[sec]        g'       Rc        Ic
-------------------------------------------------------------------------------------------------------
~12      09:00:58.3           420               ~14      ~14        ~14
-------------------------------------------------------------------------------------------------------
T0+ : Elapsed time after the burst
T-EXP: Total Exposure time
```
We used GSC2.3 catalog for flux calibration. The magnitudes are expressed in the AB system.
Further analysis is ongoing.
GCN Circular #23416
D. Denisenko (SAI MSU), M. Gnetov, E. Guskov, M. Orlova, V. Smirnov, I. Vodolazskiy, N. Zlobin, D. Fernandez Ortiz (Center on Donskaya, Moscow) report:
GRB 181110A: optical observations from iTelescope SSO
The field of bright long GRB 181110A (Evans et al., GCN Circ. 23413) was observed remotely from Siding Spring using iTelescope.Net T17 instrument (0.43-m f/6.8 reflector + FLI PL4710 CCD) on 09:49-09:55 UT. Four unfiltered 60-sec exposures were obtained, until the telescope was occupied by the other scheduled user. The optical transient is well detected on 4 images and slowly fading, in accordance with Yamanaka et al., GCN Circ. 23414. The following magnitudes were measured using the nearby star USNO-B1.0 0531-0876625 as a reference with R2=14.80 in USNO-B1.0:
```
TIME-OBS, JD T-T0,s  Mag. Error
-------------------------------
2458432.9093  3952  15.60  0.02
2458432.9105  4055  15.64  0.01
2458432.9117  4156  15.68  0.01
2458432.9128  4257  15.77  0.02
-------------------------------
```
Comparison of T17 iTelescope.Net image and 1990-09-19 DSS Red plate is uploaded to http://scan.sai.msu.ru/~denis/GRB/GRB181110A-T17-DSS-anim.gif (FOV 5'x5', 2x zoom).
GCN Circular #23417
M.R. Goad, J.P. Osborne, A.P. Beardmore and P.A. Evans (U. Leicester) report on behalf of the Swift-XRT team.
Using 2774 s of XRT Photon Counting mode data and 4 UVOT images for GRB 181110A, 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 = 302.31802, -36.89665 which is equivalent to:
```
RA (J2000): 20h 09m 16.32s
Dec (J2000): -36d 53' 47.9"
```
with an uncertainty of 1.4 arcsec (radius, 90% confidence).
This position may be improved as more data are received. The latest position can be viewed at http://www.swift.ac.uk/xrt_positions. Position enhancement is described by Goad et al. (2007, A&A, 476, 1401) and Evans et al. (2009, MNRAS, 397, 1177).
This circular was automatically generated, and is an official product of the Swift-XRT team.
GCN Circular #23418
B. Sbarufatti (INAF-OAB/PSU), D.N. Burrows (PSU), A.P. Beardmore (U. Leicester), J.P. Osborne (U. Leicester), A. D'Ai (INAF-IASFPA), A. Melandri (INAF-OAB), P. D'Avanzo (INAF-OAB), A. Tohuvavohu (PSU) and P.A. Evans report on behalf of the Swift-XRT team:
We have analysed 7.4 ks of XRT data for GRB 181110A (Evans et al. GCN Circ. 23413), from 67 s to 24.8 ks after the BAT trigger. The data comprise 260 s in Windowed Timing (WT) mode with the remainder in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Goad et al. (GCN Circ. 23417).
The late-time light curve (from T0+5.2 ks) can be modelled with a power-law decay with a decay index of alpha=2.10 (+/-0.14).
A spectrum formed from the WT mode data can be fitted with an absorbed power-law with a photon spectral index of 1.88 (+/-0.04). The best-fitting absorption column is 8.6 (+1.0, -0.9) x 10^20 cm^-2, consistent with the Galactic value of 7.7 x 10^20 cm^-2 (Willingale et al. 2013). The PC mode spectrum has a photon index of 1.74 (+0.07, -0.06) and a best-fitting absorption column consistent with the Galactic value. The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 3.8 x 10^-11 (4.3 x 10^-11) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
```
Total column:	     7.7 (+1.5, -0.0) x 10^20 cm^-2
Galactic foreground: 7.7 x 10^20 cm^-2
Excess significance: <1.6 sigma
Photon index:	     1.74 (+0.07, -0.06)
```
If the light curve continues to decay with a power-law decay index of 2.10, the count rate at T+24 hours will be 2.2 x 10^-3 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 8.3 x 10^-14 (9.3 x 10^-14) erg cm^-2 s^-1.
The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00871316.
This circular is an official product of the Swift-XRT team.
GCN Circular #23419
N. P. M. Kuin (UCL-MSSL) and P. A. Evans (U. Leicester) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 181110A 72 s after the BAT trigger (Evans et al., GCN Circ. 23413). The GRB was detected in ground photometry (Yamanaka et al., GCN Circ. 23414; Murata et al., GCN Circ. 23415; Denisenko et al. GCN Circ. 23416). The UVOT detects a source consistent with the XRT position (Goad et al. GCN Circ. 23417) in the initial UVOT exposures.
The preliminary UVOT position is:
```
    RA  (J2000) =  20:09:16.27 = 302.31781 (deg.)
    Dec (J2000) = -36:53:47.9  = -36.89664 (deg.)
```
with an estimated uncertainty of 0.46 arc sec. (radius, 90% confidence).
Preliminary detections using the UVOT photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the early exposures are:
```
Filter         T_start(s)   T_stop(s)      Exp(s)           Mag

white               72          222          147         18.52 +/- 0.07
v                  614          634           19         16.09 +/- 0.13
b                  540          559           20         16.98 +/- 0.11
u                  284          534          246         16.66 +/- 0.04
w1                 663          683           19         15.65 +/- 0.13
m2                1068         1088           20         14.66 +/- 0.11
w2                1018         1038           20         15.74 +/- 0.14
```
The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.07 in the direction of the burst (Schlegel et al. 1998).
The source showed a rebrightening with a late peak at around 1100s after the trigger.
GCN Circular #23420
A. Y. Lien (GSFC/UMBC), S. D. Barthelmy (GSFC), J. R. Cummings (CPI), P. A. Evans (U Leicester), H. A. Krimm (NSF/USRA), 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-239 to T+963 sec from the recent telemetry downlink, we report further analysis of BAT GRB 181110A (trigger #871316) (Evans et al., GCN Circ. 23413). The BAT ground-calculated position is RA, Dec = 302.330, -36.878 deg which is
```
  RA(J2000)  =  20h 09m 19.2s
  Dec(J2000) = -36d 52' 41.4"
```
with an uncertainty of 1.4 arcmin, (radius, sys+stat, 90% containment). The partial coding was 100%.
The mask-weighted light curve shows a multi-peaked structure that starts at ~T-110 s and ends at ~T+130 s. The main peak occurs at ~T+25 s. T90 (15-350 keV) is 138.4 +- 10.9 sec (estimated error including systematics).
The time-averaged spectrum from T-109.3 to T+129.8 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 2.02 +- 0.05. The fluence in the 15-150 keV band is 9.9 +- 0.3 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+25.03 sec in the 15-150 keV band is 3.7 +- 0.3 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/871316/BA/
GCN Circular #23421
D. A. Perley (LJMU), D. B. Malesani (DAWN/NBI and DARK/NBI), J. P. U. Fynbo (DAWN/NBI and DAWN/DTU), K. E. Heintz (Univ. Iceland), D. A. Kann (HETH/IAA-CSIC), V. D'Elia (SSDC), L. Izzo (HETH/IAA-CSIC), and N. R. Tanvir (Univ. Leicester) report:
We observed the optical counterpart of GRB 181110A (Evans et al. GCN 23413; Yamanaka et al., GCN 23414; Murata et al. GCN 23415) with the ESO-VLT UT2 equipped with the X-shooter spectrograph. We acquired four 600 second spectra on UT 2018-11-11 between 00:36 and 01:21, approximately 16 hours after the GRB. The optical afterglow was R~20.4 at this time.
Continuum is detected in the reduced spectrum across the entire spectral range of the instrument (blue limit of 3000 Angstroms). Several weak absorption features are also detected: in particular, we identify Mg II and Fe II at a common redshift of z=1.505, identifying this as the most likely redshift of the GRB. An additional intervening system is also identified from (probable) Mg II absorption at z=0.28.
We acknowledge the ESO observing staff at Paranal, including Stephane Brillant and Eleonora Sani.
GCN Circular #23422
J. Bolmer (MPE, Garching) and P. Schady (Univ. of Bath) report:
We observed the field of GRB 181110A (Swift trigger 871316; Evans et al., GCN #23413) simultaneously in g'r'i'z'JHK with GROND (Greiner et al. 2008, PASP 120, 405) mounted at the 2.2 m MPG telescope at ESO La Silla Observatory (Chile).
Observations started at 00:01 UT, 15.5 hrs after the GRB trigger, and were performed under poor seeing conditions, 4.1“, and at an average airmass of 1.2.
We detect a source at a position consistent with the X-ray and optical afterglow (Evans et al., GCN #23413; Kuin et al., GCN #23419). Based on the first 17 min of total exposures in g'r'i'z' and 20 min in JHK, we measure the following preliminary AB magnitudes:
```
g' = 21.25 +/- 0.06 mag
r' = 20.58 +/- 0.05 mag
i' = 19.91 +/- 0.08 mag
z' = 20.08 +/- 0.09 mag
J = 20.16 +/- 0.20 mag
H = 19.76 +/- 0.18 mag
K = 19.27 +/- 0.18 mag
```
Given magnitudes are calibrated against USNO and 2MASS field stars and are not corrected for the expected Galactic foreground extinction corresponding to a reddening of E_(B-V)=0.06 in the direction of the burst (Schlafly & Finkbeiner 2011).
GCN Circular #23423
S. Belkin (IKI), A. Pozanenko (IKI), E. Mazaeva (IKI), A. Volnova (IKI) report on behalf of IKI-FuN follow-up collaboration:
We observed the field of GRB 181110A (Evans et al., GCN 23413) with RC-1000 telescopes of CHILESCOPE observatory. Observation started on Nov. 11 (UT) 01:02:08 in r'-filter and were performed under moderate seeing conditions of 1.5''. We detect optical afterglow (Evans et al., GCN 2341; Yamanaka et al., GCN 23414; Murata et al., GCN 23415; Denisenko et al., GCN 23416; Perley et al., GCN 23421; Bolmer et al., GCN 23422).
Preliminary photometry in AB is following.
```
Date       UT start t-T0    Filter Exp.   OT    Err. UL
                     (mid, days)    (s)

2018-11-11 01:02:08 0.69979 r'     10*300 20.53 0.10 22.8
```
The photometry is based on several nearby stars, magnitudes taken from NOMAD catalog and Jester et al. (2005) transformations.
GCN Circular #23424
D. Frederiks, S. Golenetskii, R.Aptekar, A. Kozlova, A.Lysenko, D. Svinkin, A. Tsvetkova, M. Ulanov, and T. Cline, on behalf of the Konus-Wind team, report:
The long GRB 181110A (Swift-BAT trigger #871316: (Evans et al., GCN 23413; Lien et al., GCN 23420; T0(BAT)= 08:43:31.320 UT) was detected by Konus-Wind (KW) in the waiting mode.
A Bayesian block analysis of the KW waiting mode data in the 22-380 keV band reveals a count rate increase in the interval from ~T0(BAT)-42 s to ~T0(BAT)+98 s. No statistically significant emission has been detected above 380 keV.
The KW light curve of this burst is available at http://www.ioffe.ru/LEA/GRBs/GRB181110A/
Modeling the KW 3-channel spectrum (from T0(BAT)-36 s to T0(BAT)+32 s) by a power law with exponential cutoff (CPL) model dN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep) yields alpha = -1.63(-0.26,+0.34) and Ep = 48(-27,+14) keV.
The total burst fluence in the 15-1500 keV band is (1.1 � 0.2)x10^-5 erg/cm^2.
Assuming z = 1.505 (Perley et al., GCN 23421) and a standard cosmology model with H_0 = 70 km/s/Mpc, Omega_M = 0.30, and Omega_Lambda = 0.70, the burst isotropic energy release E_iso is ~1.1x10^53 erg (1-10000 keV, rest frame), and the rest-frame peak energy is ~120 keV.
All the quoted errors are estimated at the 1 sigma confidence level. All the presented results are preliminary.

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