Gamma-ray Burst 170330A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

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Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 30 Mar 17 22:30:33 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     744773,   Seg_Num: 0
GRB_RA:          283.326d {+18h 53m 18s} (J2000),
                 283.569d {+18h 54m 17s} (current),
                 282.621d {+18h 50m 29s} (1950)
GRB_DEC:         -13.437d {-13d 26' 12"} (J2000),
                 -13.415d {-13d 24' 52"} (current),
                 -13.500d {-13d 29' 57"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       12428 [cnts]    Image_Peak=340 [image_cnts]
TRIGGER_DUR:     4.096 [sec] 
TRIGGER_INDEX:   290     E_range: 15-50 keV
BKG_INTEN:       105516 [cnts]
BKG_TIME:        80933.16 SOD {22:28:53.16} UT
BKG_DUR:         40 [sec]
GRB_DATE:        17842 TJD;    89 DOY;   17/03/30
GRB_TIME:        80991.34 SOD {22:29:51.34} UT
GRB_PHI:          87.76 [deg]
GRB_THETA:        27.21 [deg]
SOLN_STATUS:     0x3
RATE_SIGNIF:     18.65 [sigma]
IMAGE_SIGNIF:    9.35 [sigma]
MERIT_PARAMS:     +1  +0  +0  +2  +1  +0  +0  +1  -4  +0 
SUN_POSTN:         9.57d {+00h 38m 17s}   +4.12d {+04d 07' 17"}
SUN_DIST:         87.08 [deg]   Sun_angle= 5.7 [hr] (West of Sun)
MOON_POSTN:       47.81d {+03h 11m 13s}  +12.63d {+12d 37' 59"}
MOON_DIST:       125.78 [deg]
MOON_ILLUM:      11 [%]
GAL_COORDS:       21.13, -6.49 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      283.13,  9.40 [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 = 109.08,-15.18 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 30 Mar 17 22:31:59 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     744773,   Seg_Num: 0
GRB_RA:          283.3323d {+18h 53m 19.75s} (J2000),
                 283.5755d {+18h 54m 18.12s} (current),
                 282.6268d {+18h 50m 30.44s} (1950)
GRB_DEC:         -13.4301d {-13d 25' 48.3"} (J2000),
                 -13.4078d {-13d 24' 27.9"} (current),
                 -13.4926d {-13d 29' 33.4"} (1950)
GRB_ERROR:       5.9 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       7.13e-10 [erg/cm2/sec]
GRB_SIGNIF:      6.00 [sigma]
IMG_START_DATE:  17842 TJD;    89 DOY;   17/03/30
IMG_START_TIME:  81089.66 SOD {22:31:29.66} UT,   98.3 [sec] since BAT Trigger Time
TAM[0-3]:        327.69 237.20 261.69 243.72
AMPLIFIER:       2
WAVEFORM:        134
SUN_POSTN:         9.57d {+00h 38m 17s}   +4.12d {+04d 07' 19"}
SUN_DIST:         87.07 [deg]   Sun_angle= 5.7 [hr] (West of Sun)
MOON_POSTN:       47.82d {+03h 11m 17s}  +12.64d {+12d 38' 12"}
MOON_DIST:       125.79 [deg]
MOON_ILLUM:      11 [%]
GAL_COORDS:       21.14, -6.49 [deg] galactic lon,lat of the burst
ECL_COORDS:      283.14,  9.40 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        The XRT position is 0.54 arcmin from the BAT position.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 30 Mar 17 22:32:25 UT
NOTICE_TYPE:     Swift-XRT Image
TRIGGER_NUM:     744773,   Seg_Num: 0
GRB_RA:          283.3323d {+18h 53m 19.7s} (J2000),
                 283.5755d {+18h 54m 18.1s} (current),
                 282.6268d {+18h 50m 30.4s} (1950)
GRB_DEC:         -13.4301d {-13d 25' 48.3"} (J2000),
                 -13.4078d {-13d 24' 27.9"} (current),
                 -13.4926d {-13d 29' 33.4"} (1950)
GRB_ERROR:       5.8 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       36 [cnts]
IMG_START_DATE:  17842 TJD;    89 DOY;   17/03/30
IMG_START_TIME:  81089.66 SOD {22:31:29.66} UT,   98.3 [sec] since BAT Trigger Time
CENTROID_X:      338.42,  raw= 338  [pixels]
CENTROID_Y:      310.34,  raw= 310  [pixels]
ROLL:            85.10 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   28.16
GRB_POS_XRT_Z:   75.49
IMAGE_URL:       sw00744773000msxps_rw.img
SUN_POSTN:         9.57d {+00h 38m 17s}   +4.12d {+04d 07' 19"}
SUN_DIST:         87.07 [deg]   Sun_angle= 5.7 [hr] (West of Sun)
MOON_POSTN:       47.82d {+03h 11m 18s}  +12.64d {+12d 38' 16"}
MOON_DIST:       125.80 [deg]
MOON_ILLUM:      11 [%]
GAL_COORDS:       21.14, -6.49 [deg] galactic lon,lat of the burst
ECL_COORDS:      283.14,  9.40 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 30 Mar 17 22:32:29 UT
NOTICE_TYPE:     Swift-XRT Processed Image
TRIGGER_NUM:     744773,   Seg_Num: 0
GRB_RA:          283.3323d {+18h 53m 19.7s} (J2000),
                 283.5755d {+18h 54m 18.1s} (current),
                 282.6268d {+18h 50m 30.4s} (1950)
GRB_DEC:         -13.4301d {-13d 25' 48.3"} (J2000),
                 -13.4078d {-13d 24' 27.9"} (current),
                 -13.4926d {-13d 29' 33.4"} (1950)
GRB_ERROR:       5.8 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       36 [cnts]
IMG_START_DATE:  17842 TJD;    89 DOY;   17/03/30
IMG_START_TIME:  81089.66 SOD {22:31:29.66} UT,   98.3 [sec] since BAT Trigger Time
CENTROID_X:      338.42,  raw= 338  [pixels]
CENTROID_Y:      310.34,  raw= 310  [pixels]
ROLL:            85.10 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   28.16
GRB_POS_XRT_Z:   75.49
IMAGE_URL:       sw00744773000msxps_rw.img
SUN_POSTN:         9.57d {+00h 38m 17s}   +4.12d {+04d 07' 19"}
SUN_DIST:         87.07 [deg]   Sun_angle= 5.7 [hr] (West of Sun)
MOON_POSTN:       47.82d {+03h 11m 18s}  +12.64d {+12d 38' 17"}
MOON_DIST:       125.80 [deg]
MOON_ILLUM:      11 [%]
GAL_COORDS:       21.14, -6.49 [deg] galactic lon,lat of the burst
ECL_COORDS:      283.14,  9.40 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Processed Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 30 Mar 17 22:33:50 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     744773,   Seg_Num: 0
GRB_RA:          283.326d {+18h 53m 18s} (J2000),
                 283.569d {+18h 54m 17s} (current),
                 282.621d {+18h 50m 29s} (1950)
GRB_DEC:         -13.437d {-13d 26' 12"} (J2000),
                 -13.415d {-13d 24' 52"} (current),
                 -13.500d {-13d 29' 57"} (1950)
GRB_DATE:        17842 TJD;    89 DOY;   17/03/30
GRB_TIME:        80991.34 SOD {22:29:51.34} UT
TRIGGER_INDEX:   290
GRB_PHI:          87.76 [deg]
GRB_THETA:        27.21 [deg]
DELTA_TIME:      -57.00 [sec]
TRIGGER_DUR:     4.096 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     18.65 [sigma]
IMAGE_SIGNIF:    9.35 [sigma]
LC_URL:          sw00744773000msb.lc
SUN_POSTN:         9.57d {+00h 38m 17s}   +4.12d {+04d 07' 21"}
SUN_DIST:         87.08 [deg]   Sun_angle= 5.7 [hr] (West of Sun)
MOON_POSTN:       47.84d {+03h 11m 21s}  +12.64d {+12d 38' 29"}
MOON_DIST:       125.82 [deg]
MOON_ILLUM:      11 [%]
GAL_COORDS:       21.13, -6.49 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      283.13,  9.40 [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 = 109.08,-15.18 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 30 Mar 17 22:35:59 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     744773,   Seg_Num: 0
POINT_RA:        283.354d {+18h 53m 25s} (J2000)
POINT_DEC:       -13.436d {-13d 26' 09"} (J2000)
POINT_ROLL:      85.104d
IMG_START_DATE:  17842 TJD;    89 DOY;   17/03/30
IMG_START_TIME:  81099.45 SOD {22:31:39.45} UT,   108.1 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        5.030
N_STARS:         190
X_OFFSET:        288 [pixels]
Y_OFFSET:        648 [pixels]
X_MAX:           1247 [pixels]
Y_MAX:           1607 [pixels]
DET_THRESH:      19
PHOTO_THRESH:    11
SL_URL:          sw00744773000msufc0108.fits
SUN_POSTN:         9.57d {+00h 38m 18s}   +4.12d {+04d 07' 23"}
SUN_DIST:         87.05 [deg]   Sun_angle= 5.7 [hr] (West of Sun)
MOON_POSTN:       47.86d {+03h 11m 26s}  +12.65d {+12d 38' 48"}
MOON_DIST:       125.81 [deg]
MOON_ILLUM:      11 [%]
GAL_COORDS:       21.14, -6.51 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      283.16,  9.40 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 30 Mar 17 22:36:31 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     744773,   Seg_Num: 0
POINT_RA:        283.354d {+18h 53m 25s} (J2000)
POINT_DEC:       -13.436d {-13d 26' 09"} (J2000)
POINT_ROLL:      85.104d
IMG_START_DATE:  17842 TJD;    89 DOY;   17/03/30
IMG_START_TIME:  81099.45 SOD {22:31:39.45} UT,   108.1 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        5.030
N_STARS:         190
X_OFFSET:        288 [pixels]
Y_OFFSET:        648 [pixels]
X_MAX:           1247 [pixels]
Y_MAX:           1607 [pixels]
DET_THRESH:      19
PHOTO_THRESH:    11
SL_URL:          sw00744773000msufc0108.fits
SUN_POSTN:         9.57d {+00h 38m 18s}   +4.12d {+04d 07' 23"}
SUN_DIST:         87.05 [deg]   Sun_angle= 5.7 [hr] (West of Sun)
MOON_POSTN:       47.87d {+03h 11m 28s}  +12.65d {+12d 38' 53"}
MOON_DIST:       125.82 [deg]
MOON_ILLUM:      11 [%]
GAL_COORDS:       21.14, -6.51 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      283.16,  9.40 [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:     Thu 30 Mar 17 22:38:07 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     744773,   Seg_Num: 0
POINT_RA:        283.354d {+18h 53m 25s} (J2000)
POINT_DEC:       -13.436d {-13d 26' 09"} (J2000)
ROLL:            85.104d
IMG_START_DATE:  17842 TJD;    89 DOY;   17/03/30
IMG_START_TIME:  81099.45 SOD {22:31:39.45} UT,   108.1 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     512605918
X_OFFSET:        626 [pixels]
Y_OFFSET:        905 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       786
Y_GRB_POS:       1065
BINNING_INDEX:   1
IM_URL:          sw00744773000msuni0127.fits
SUN_POSTN:         9.57d {+00h 38m 18s}   +4.12d {+04d 07' 25"}
SUN_DIST:         87.06 [deg]   Sun_angle= 5.7 [hr] (West of Sun)
MOON_POSTN:       47.88d {+03h 11m 32s}  +12.65d {+12d 39' 07"}
MOON_DIST:       125.83 [deg]
MOON_ILLUM:      11 [%]
GAL_COORDS:       21.14, -6.51 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      283.16,  9.40 [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:     Thu 30 Mar 17 22:38:25 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     744773,   Seg_Num: 0
POINT_RA:        283.354d {+18h 53m 25s} (J2000)
POINT_DEC:       -13.436d {-13d 26' 09"} (J2000)
ROLL:            85.104d
IMG_START_DATE:  17842 TJD;    89 DOY;   17/03/30
IMG_START_TIME:  81099.45 SOD {22:31:39.45} UT,   108.1 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     512605918
X_OFFSET:        626 [pixels]
Y_OFFSET:        905 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       786
Y_GRB_POS:       1065
BINNING_INDEX:   1
IM_URL:          sw00744773000msuni0127.fits
SUN_POSTN:         9.57d {+00h 38m 18s}   +4.12d {+04d 07' 25"}
SUN_DIST:         87.06 [deg]   Sun_angle= 5.7 [hr] (West of Sun)
MOON_POSTN:       47.88d {+03h 11m 32s}  +12.65d {+12d 39' 10"}
MOON_DIST:       125.84 [deg]
MOON_ILLUM:      11 [%]
GAL_COORDS:       21.14, -6.51 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      283.16,  9.40 [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:     Thu 30 Mar 17 22:42:53 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     744773,   Seg_Num: 0
POINT_RA:        283.356d {+18h 53m 25s} (J2000)
POINT_DEC:       -13.436d {-13d 26' 08"} (J2000)
POINT_ROLL:      85.103d
IMG_START_DATE:  17842 TJD;    89 DOY;   17/03/30
IMG_START_TIME:  81257.40 SOD {22:34:17.40} UT,   266.1 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        1.527
N_STARS:         190
X_OFFSET:        306 [pixels]
Y_OFFSET:        585 [pixels]
X_MAX:           1265 [pixels]
Y_MAX:           1544 [pixels]
DET_THRESH:      10
PHOTO_THRESH:    5
SL_URL:          sw00744773000msufc0266.fits
SUN_POSTN:         9.58d {+00h 38m 19s}   +4.12d {+04d 07' 29"}
SUN_DIST:         87.06 [deg]   Sun_angle= 5.7 [hr] (West of Sun)
MOON_POSTN:       47.93d {+03h 11m 43s}  +12.66d {+12d 39' 50"}
MOON_DIST:       125.88 [deg]
MOON_ILLUM:      11 [%]
GAL_COORDS:       21.15, -6.51 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      283.16,  9.40 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 30 Mar 17 22:43:22 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     744773,   Seg_Num: 0
POINT_RA:        283.356d {+18h 53m 25s} (J2000)
POINT_DEC:       -13.436d {-13d 26' 08"} (J2000)
POINT_ROLL:      85.103d
IMG_START_DATE:  17842 TJD;    89 DOY;   17/03/30
IMG_START_TIME:  81257.40 SOD {22:34:17.40} UT,   266.1 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        1.527
N_STARS:         190
X_OFFSET:        306 [pixels]
Y_OFFSET:        585 [pixels]
X_MAX:           1265 [pixels]
Y_MAX:           1544 [pixels]
DET_THRESH:      10
PHOTO_THRESH:    5
SL_URL:          sw00744773000msufc0266.fits
SUN_POSTN:         9.58d {+00h 38m 19s}   +4.12d {+04d 07' 30"}
SUN_DIST:         87.06 [deg]   Sun_angle= 5.7 [hr] (West of Sun)
MOON_POSTN:       47.93d {+03h 11m 44s}  +12.67d {+12d 39' 54"}
MOON_DIST:       125.88 [deg]
MOON_ILLUM:      11 [%]
GAL_COORDS:       21.15, -6.51 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      283.16,  9.40 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        All 4 attachments are included.

GCN Circular #20944
P. D'Avanzo (INAF-OAB), S. D. Barthelmy (GSFC), A. Cholden-Brown (PSU), J. A. Kennea (PSU), N. P. M. Kuin (UCL-MSSL), F. E. Marshall (NASA/GSFC), A. Melandri (INAF-OAB), B. Sbarufatti (INAF-OAB/PSU) and M. H. Siegel (PSU) report on behalf of the Swift Team:
At 22:29:51 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 170330A (trigger=744773). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 283.326, -13.437, which is
```
   RA(J2000)  =  18h 53m 18s
   Dec(J2000) = -13d 26' 12"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve shows a single peak with a duration of about 10 sec. The peak count rate was ~1000 counts/sec (15-350 keV), at ~3 sec after the trigger.
The XRT began observing the field at 22:31:29.6 UT, 98.4 seconds after the BAT trigger. XRT found a bright, uncatalogued X-ray source located at RA, Dec 283.3323, -13.4301 which is equivalent to:
```
   RA(J2000)  = +18h 53m 19.75s
   Dec(J2000) = -13d 25' 48.4"
```
with an uncertainty of 5.9 arcseconds (radius, 90% containment). This location is 33 arcseconds from the BAT onboard position, within the BAT error circle. No event data are yet available to determine the column density using X-ray spectroscopy.
UVOT took a finding chart exposure of 150 seconds with the White filter starting 108 seconds after the BAT trigger. No credible afterglow candidate has been found in the initial data products. The 2.7'x2.7' sub-image covers 100% of the XRT error circle. Because of the density of catalogued stars, further analysis is required to report an upper limit for any afterglow in the sub-image. 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 expected extinction corresponding to E(B-V) of 0.45.
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:     Thu 30 Mar 17 22:44:20 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     744773,   Seg_Num: 0
POINT_RA:        283.356d {+18h 53m 25s} (J2000)
POINT_DEC:       -13.436d {-13d 26' 08"} (J2000)
ROLL:            85.103d
IMG_START_DATE:  17842 TJD;    89 DOY;   17/03/30
IMG_START_TIME:  81257.40 SOD {22:34:17.40} UT,   266.1 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     512606076
X_OFFSET:        626 [pixels]
Y_OFFSET:        905 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       786
Y_GRB_POS:       1065
BINNING_INDEX:   1
IM_URL:          sw00744773000msuni0285.fits
SUN_POSTN:         9.58d {+00h 38m 19s}   +4.13d {+04d 07' 31"}
SUN_DIST:         87.06 [deg]   Sun_angle= 5.7 [hr] (West of Sun)
MOON_POSTN:       47.94d {+03h 11m 47s}  +12.67d {+12d 40' 03"}
MOON_DIST:       125.89 [deg]
MOON_ILLUM:      11 [%]
GAL_COORDS:       21.15, -6.51 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      283.16,  9.40 [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:     Thu 30 Mar 17 22:44:40 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     744773,   Seg_Num: 0
POINT_RA:        283.356d {+18h 53m 25s} (J2000)
POINT_DEC:       -13.436d {-13d 26' 08"} (J2000)
ROLL:            85.103d
IMG_START_DATE:  17842 TJD;    89 DOY;   17/03/30
IMG_START_TIME:  81257.40 SOD {22:34:17.40} UT,   266.1 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     512606076
X_OFFSET:        626 [pixels]
Y_OFFSET:        905 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       786
Y_GRB_POS:       1065
BINNING_INDEX:   1
IM_URL:          sw00744773000msuni0285.fits
SUN_POSTN:         9.58d {+00h 38m 19s}   +4.13d {+04d 07' 31"}
SUN_DIST:         87.06 [deg]   Sun_angle= 5.7 [hr] (West of Sun)
MOON_POSTN:       47.95d {+03h 11m 47s}  +12.67d {+12d 40' 06"}
MOON_DIST:       125.90 [deg]
MOON_ILLUM:      11 [%]
GAL_COORDS:       21.15, -6.51 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      283.16,  9.40 [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:     Thu 30 Mar 17 22:52:05 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     744773,   Seg_Num: 0
POINT_RA:        283.356d {+18h 53m 26s} (J2000)
POINT_DEC:       -13.436d {-13d 26' 09"} (J2000)
POINT_ROLL:      85.103d
IMG_START_DATE:  17842 TJD;    89 DOY;   17/03/30
IMG_START_TIME:  81860.60 SOD {22:44:20.60} UT,   869.3 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        6.593
N_STARS:         190
X_OFFSET:        66 [pixels]
Y_OFFSET:        345 [pixels]
X_MAX:           1505 [pixels]
Y_MAX:           1784 [pixels]
DET_THRESH:      22
PHOTO_THRESH:    13
SL_URL:          sw00744773000msufc0869.fits
SUN_POSTN:         9.58d {+00h 38m 20s}   +4.13d {+04d 07' 38"}
SUN_DIST:         87.06 [deg]   Sun_angle= 5.7 [hr] (West of Sun)
MOON_POSTN:       48.02d {+03h 12m 05s}  +12.69d {+12d 41' 12"}
MOON_DIST:       125.97 [deg]
MOON_ILLUM:      11 [%]
GAL_COORDS:       21.15, -6.51 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      283.16,  9.40 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 30 Mar 17 22:52:45 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     744773,   Seg_Num: 0
POINT_RA:        283.356d {+18h 53m 26s} (J2000)
POINT_DEC:       -13.436d {-13d 26' 09"} (J2000)
POINT_ROLL:      85.103d
IMG_START_DATE:  17842 TJD;    89 DOY;   17/03/30
IMG_START_TIME:  81860.60 SOD {22:44:20.60} UT,   869.3 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        6.593
N_STARS:         190
X_OFFSET:        66 [pixels]
Y_OFFSET:        345 [pixels]
X_MAX:           1505 [pixels]
Y_MAX:           1784 [pixels]
DET_THRESH:      22
PHOTO_THRESH:    13
SL_URL:          sw00744773000msufc0869.fits
SUN_POSTN:         9.58d {+00h 38m 20s}   +4.13d {+04d 07' 39"}
SUN_DIST:         87.06 [deg]   Sun_angle= 5.7 [hr] (West of Sun)
MOON_POSTN:       48.03d {+03h 12m 07s}  +12.69d {+12d 41' 18"}
MOON_DIST:       125.98 [deg]
MOON_ILLUM:      11 [%]
GAL_COORDS:       21.15, -6.51 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      283.16,  9.40 [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:     Thu 30 Mar 17 22:53:12 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     744773,   Seg_Num: 0
GRB_RA:          283.3308d {+18h 53m 19.39s} (J2000),
                 283.5740d {+18h 54m 17.76s} (current),
                 282.6253d {+18h 50m 30.08s} (1950)
GRB_DEC:         -13.4312d {-13d 25' 52.3"} (J2000),
                 -13.4089d {-13d 24' 31.9"} (current),
                 -13.4937d {-13d 29' 37.4"} (1950)
GRB_ERROR:       2.0 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  17842 TJD;    89 DOY;   17/03/30
IMG_START_TIME:  81496.00 SOD {22:38:16.00} UT,   504.7 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:         9.58d {+00h 38m 20s}   +4.13d {+04d 07' 39"}
SUN_DIST:         87.09 [deg]   Sun_angle= 5.7 [hr] (West of Sun)
MOON_POSTN:       48.03d {+03h 12m 08s}  +12.69d {+12d 41' 22"}
MOON_DIST:       126.01 [deg]
MOON_ILLUM:      11 [%]
GAL_COORDS:       21.14, -6.49 [deg] galactic lon,lat of the burst
ECL_COORDS:      283.14,  9.40 [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:     Thu 30 Mar 17 22:54:11 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     744773,   Seg_Num: 0
POINT_RA:        283.356d {+18h 53m 26s} (J2000)
POINT_DEC:       -13.436d {-13d 26' 09"} (J2000)
ROLL:            85.103d
IMG_START_DATE:  17842 TJD;    89 DOY;   17/03/30
IMG_START_TIME:  81860.60 SOD {22:44:20.60} UT,   869.3 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     512606679
X_OFFSET:        625 [pixels]
Y_OFFSET:        904 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       785
Y_GRB_POS:       1064
BINNING_INDEX:   1
IM_URL:          sw00744773000msuni0888.fits
SUN_POSTN:         9.58d {+00h 38m 20s}   +4.13d {+04d 07' 40"}
SUN_DIST:         87.06 [deg]   Sun_angle= 5.7 [hr] (West of Sun)
MOON_POSTN:       48.04d {+03h 12m 11s}  +12.69d {+12d 41' 31"}
MOON_DIST:       125.99 [deg]
MOON_ILLUM:      11 [%]
GAL_COORDS:       21.15, -6.51 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      283.16,  9.40 [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:     Thu 30 Mar 17 22:54:15 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     744773,   Seg_Num: 0
POINT_RA:        283.356d {+18h 53m 26s} (J2000)
POINT_DEC:       -13.436d {-13d 26' 09"} (J2000)
ROLL:            85.103d
IMG_START_DATE:  17842 TJD;    89 DOY;   17/03/30
IMG_START_TIME:  81860.60 SOD {22:44:20.60} UT,   869.3 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     512606679
X_OFFSET:        625 [pixels]
Y_OFFSET:        904 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       785
Y_GRB_POS:       1064
BINNING_INDEX:   1
IM_URL:          sw00744773000msuni0888.fits
SUN_POSTN:         9.58d {+00h 38m 20s}   +4.13d {+04d 07' 40"}
SUN_DIST:         87.06 [deg]   Sun_angle= 5.7 [hr] (West of Sun)
MOON_POSTN:       48.04d {+03h 12m 11s}  +12.69d {+12d 41' 32"}
MOON_DIST:       125.99 [deg]
MOON_ILLUM:      11 [%]
GAL_COORDS:       21.15, -6.51 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      283.16,  9.40 [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 #20945
P.A. Evans (U. Leicester) reports on behalf of the Swift-XRT team:
Using promptly downlinked XRT event data for GRB 170330A, we find an enhanced XRT position of the afterglow: RA, Dec: 283.3308, -13.4310 which is equivalent to:
```
   RA (J2000)  = 18 53 19.39
   Dec (J2000) = -13 25 51.7
```
with an uncertainty of 2.0 arcseconds (radius, 90% confidence). Analysis of the promptly available data is online at http://www.swift.ac.uk/sper/744773.
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 #20954
C. Guidorzi (U. Ferrara), S. Kobayashi, I.A. Steele (LJMU), A. Gomboc (U. Nova Gorica), C.G. Mundell (U. Bath) on behalf of a large collaboration report:
We observed Swift GRB 170330A (D'Avanzo et al. GCN 20944) on March 31, 07:00 UT (8.5 hours since the GRB) with one 1-m LCO unit in Cerro Tololo with the SDSS i filter. Comparing with the PanSTARRS archive data, within the XRT error circle we do not find any new/variable source down to i>20.5 mag (with a total exposure of 10x120s at 8.7 hours mid time) as calibrated against nearby PanSTARRS sources.
GCN Circular #20959
S.W.K. Emery (UCL-MSSL) 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 170330A 109 s after the BAT trigger (D'Avanzo et al., GCN Circ. 20944). A fading source consistent with the XRT position (Evans GCN Circ. 20945) is detected in the initial UVOT exposures.
The preliminary UVOT position is:
```
    RA  (J2000) =  18:53:19.36 = 283.33067 (deg.)
    Dec (J2000) = -13:25:51.2  = -13.43090 (deg.)
```
with an estimated uncertainty of 0.46 arc sec. (radius, 90% confidence).
Preliminary detections and 3-sigma upper limits 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_FC           109          258          147         18.42 +/- 0.08
u_FC               266          516          246         >19.9
white              547         1368          225         19.94 +/- 0.21
v                  596         1418           97         >18.4
b                  522         1344           78         >19.3
u                  266         1484          336         >20.0
w1                 646         1467           97         >19.0
m2                 621         1442           97         >18.9
w2                 572         1393           78         >19.1
```
The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.45 in the direction of the burst (Schlegel et al. 1998).
GCN Circular #20961
A.P. Beardmore, P.A. Evans, M.R. Goad and J.P. Osborne (U. Leicester) report on behalf of the Swift-XRT team.
Using 3111 s of XRT Photon Counting mode data and 6 UVOT images for GRB 170330A, 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 = 283.33044, -13.43115 which is equivalent to:
```
RA (J2000): 18h 53m 19.30s
Dec (J2000): -13d 25' 52.1"
```
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 #20963
J.P. Osborne (U. Leicester), K.L. Page (U. Leicester), A. Melandri (INAF-OAB), P. D'Avanzo (INAF-OAB), V. D'Elia (ASDC), D.N. Burrows (PSU), A. Cholden-Brown (PSU), S. J. LaPorte (PSU), B. Mingo (U. Leicester) and report on behalf of the Swift-XRT team: report on behalf of the Swift-XRT team:
We have analysed 7.3 ks of XRT data for GRB 170330A, from 89 s to 53.1 ks after the BAT trigger. The data comprise 404 s in Windowed Timing (WT) mode (the first 7 s were taken while Swift was slewing) with the remainder in Photon Counting (PC) mode.
The light curve can be modelled with an initial power-law decay with an index of alpha=0.71 (+0.07, -0.06), followed by a break at T+439 s to an alpha of 1.061 (+0.029, -0.025).
A spectrum formed from the WT mode data can be fitted with an absorbed power-law with a photon spectral index of 2.00 (+/-0.10). The best-fitting absorption column is 4.0 (+0.6, -0.5) x 10^21 cm^-2, in excess of the Galactic value of 3.0 x 10^21 cm^-2 (Willingale et al. 2013). The PC mode spectrum has a photon index of 1.88 (+0.12, -0.11) and a best-fitting absorption column of 4.0 (+/-0.6) x 10^21 cm^-2. The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 4.2 x 10^-11 (6.1 x 10^-11) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
```
Total column:	     4.0 (+/-0.6) x 10^21 cm^-2
Galactic foreground: 3.0 x 10^21 cm^-2
Excess significance: 2.6 sigma
Photon index:	     1.88 (+0.12, -0.11)
```
If the light curve continues to decay with a power-law decay index of 1.061, the count rate at T+24 hours will be 0.021 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 8.7 x 10^-13 (1.3 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/00744773.
This circular is an official product of the Swift-XRT team.
GCN Circular #20968
A. Y. Lien (GSFC/UMBC), S. D. Barthelmy (GSFC), J. R. Cummings (CPI), P. D'Avanzo (INAF-OAB), N. Gehrels (GSFC), 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 170330A (trigger #744773) (D'Avanzo et al., GCN Circ. 20944). The BAT ground-calculated position is RA, Dec = 283.331, -13.458 deg which is
```
  RA(J2000)  =  18h 53m 19.4s
  Dec(J2000) = -13d 27' 29.2"
```
with an uncertainty of 1.6 arcmin, (radius, sys+stat, 90% containment). The partial coding was 46%.
The mask-weighted light curve shows a multi-peaked structure that lasts until ~T+126 s, with the main peak occurs around ~T-135 s. The burst came into the BAT field of view at ~T-170 s during a pre-planned spacecraft slew. Therefore, the burst emission might have started before ~T-170 s. T90 (15-350 keV) is 144.73 +- 3.51 sec (estimated error including systematics).
The time-averaged spectrum from T-143.2 to T+126.2 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.38 +- 0.09. The fluence in the 15-150 keV band is 5.6 +- 0.3 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T-134.71 sec in the 15-150 keV band is 4.5 +- 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/744773/BA/
GCN Circular #20969
V. Sharma (IUCAA), V. Bhalerao (IITB), 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 clear detection of GRB 170330A (Swift burst detection: P. D'Avanzo et al., GCN Circ. 20944) in the 40-200 keV energy range. The light curve shows multiple peak structure with peak counts at 22:27:36.000 UT, around ~35 s after the Swift trigger time i.e. ~T-170 s (Swift-BAT refined analysis: A. Y. Lien et al., GCN Circ. 20968) and it also coincides with the Swift main peak. The light curve doesn't show excess counts above the background for last ~100 s. The measured peak count rate is 163.2 counts/s above the background in combined data of four quadrants, with a total 1389 counts. The local mean background count rate was 358.8 counts/s. Using cumulative rates, we measure a T90 of 15.6 s.
It was clearly detected in the CsI anticoincidence detector (Veto) also as bright detection 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 #20974
A. Kozlova, S. Golenetskii, R. Aptekar, D. Frederiks, P. Oleynik, M. Ulanov, D. Svinkin, A. Tsvetkova, A. Lysenko, and T. Cline on behalf of the Konus-Wind team, report:
The long-duration GRB 170330A (Swift-BAT trigger #744773: D'Avanzo et al., GCN 20944; Lien et al., GCN 20968; AstroSat CZTI detection: Sharma et al., GCN 20969) triggered Konus-Wind at T0=80850.946 s UT (22:27:30.946).
The burst light curve shows a single multi-peaked pulse with a total duration of ~12 s. The emission is seen up to ~5 MeV.
As observed by Konus-Wind, the burst had a fluence of 1.85(-0.54,+0.42)x10^-5 erg/cm2, and a 64-ms peak flux, measured from T0+4.912 s, of 4.91(-2.23,+2.17)x10^-6 erg/cm2/s (both in the 20 keV - 10 MeV energy range).
The time-averaged spectrum of the burst (measured from T0 to T0+8.448 s) is best fit in the 20 keV - 5 MeV range by the GRB (Band) model with the following parameters: the low-energy photon index alpha = -0.22(-0.67,+0.88), the high energy photon index beta = -1.98(-0.84,+0.17), the peak energy Ep = 226(-66,+190) keV (chi2 = 69/76 dof)
The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB170330_T80850/
All the quoted errors are at the 90% confidence level. All the quoted values are preliminary.
GCN Circular #20979
A. Yoshida, T. Sakamoto, Y. Kawakubo, M. Moriyama, Y. Yamada (AGU), K. Yamaoka (Nagoya U), S. Nakahira (RIKEN), I. Takahashi (IPMU), Y. Asaoka, S. Ozawa, S. Torii (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 170330A (D'Avanzo et al. GCN Circ. 20944; Sharma et al. GCN Circ. 20969; Kozlova et al. GCN Circ. 20974) triggered the CALET Gamma-ray Burst Monitor (CGBM) at 22:27:27.91 on 30 March 2017. The burst signal was seen by all CGBM instruments.
The light curve of the SGM shows several peaks. The bright burst episode starts at T-5 sec and ends at T+20 sec. Two late time emissions at T+120 s and T+150 s, which triggered Swift/BAT, are barely visible in the HXM data. The T90 duration measured by the SGM data is 18.5 +- 2.4 sec (40-1000 keV).
The light curve is available at
http://cgbm.calet.jp/cgbm_trigger/flight/1174947694/
The CALET data used in this analysis are provided by the Waseda CALET Operation Center located at the Waseda University.

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Jochen Greiner, last update: 05-Apr-2017 [Disclaimer]