- GCN/BACODINE POSITION NOTICE
TITLE: GCN/SWIFT NOTICE
NOTICE_DATE: Tue 05 Dec 17 07:26:19 UT
NOTICE_TYPE: Swift-BAT GRB Position
TRIGGER_NUM: 794972, Seg_Num: 0
GRB_RA: 167.447d {+11h 09m 47s} (J2000),
167.672d {+11h 10m 41s} (current),
166.820d {+11h 07m 17s} (1950)
GRB_DEC: -12.604d {-12d 36' 12"} (J2000),
-12.701d {-12d 42' 03"} (current),
-12.332d {-12d 19' 55"} (1950)
GRB_ERROR: 3.00 [arcmin radius, statistical only]
GRB_INTEN: 0 [cnts] Image_Peak=1321 [image_cnts]
TRIGGER_DUR: 64.000 [sec]
TRIGGER_INDEX: 20000 E_range: 15-50 keV
BKG_INTEN: 0 [cnts]
BKG_TIME: 0.00 SOD {00:00:00.00} UT
BKG_DUR: 0 [sec]
GRB_DATE: 18092 TJD; 339 DOY; 17/12/05
GRB_TIME: 26443.89 SOD {07:20:43.89} UT
GRB_PHI: -2.22 [deg]
GRB_THETA: 44.44 [deg]
SOLN_STATUS: 0x13
RATE_SIGNIF: 0.00 [sigma]
IMAGE_SIGNIF: 9.46 [sigma]
MERIT_PARAMS: +1 +0 +0 +6 +1 +0 +0 +0 -17 +0
SUN_POSTN: 251.95d {+16h 47m 47s} -22.40d {-22d 23' 55"}
SUN_DIST: 79.99 [deg] Sun_angle= 5.6 [hr] (West of Sun)
MOON_POSTN: 96.94d {+06h 27m 45s} +19.94d {+19d 56' 26"}
MOON_DIST: 76.85 [deg]
MOON_ILLUM: 96 [%]
GAL_COORDS: 267.84, 43.24 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS: 173.54,-16.53 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS: SWIFT-BAT GRB Coordinates.
COMMENTS: This Notice was delayed by more than 60 sec past the end of the trigger integration interval;
COMMENTS: probably due to it occurring during a Malindi downlink session.
COMMENTS: This is an image trigger. (The RATE_SIGNIF & BKG_{INTEN, TIME, DUR} are undefined.)
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 = 11.57,1.84 [deg].
- red DSS finding chart
ps-file
- GCN NOTICE
TITLE: GCN/SWIFT NOTICE
NOTICE_DATE: Tue 05 Dec 17 07:26:51 UT
NOTICE_TYPE: Swift-XRT Position
TRIGGER_NUM: 794972, Seg_Num: 0
GRB_RA: 167.4144d {+11h 09m 39.45s} (J2000),
167.6393d {+11h 10m 33.42s} (current),
166.7876d {+11h 07m 09.02s} (1950)
GRB_DEC: -12.5857d {-12d 35' 08.5"} (J2000),
-12.6831d {-12d 40' 59.3"} (current),
-12.3143d {-12d 18' 51.5"} (1950)
GRB_ERROR: 5.0 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN: 2.81e-09 [erg/cm2/sec]
GRB_SIGNIF: 9.69 [sigma]
IMG_START_DATE: 18092 TJD; 339 DOY; 17/12/05
IMG_START_TIME: 26588.59 SOD {07:23:08.59} UT, 144.7 [sec] since BAT Trigger Time
TAM[0-3]: 327.65 237.21 261.53 243.38
AMPLIFIER: 2
WAVEFORM: 134
SUN_POSTN: 251.95d {+16h 47m 47s} -22.40d {-22d 23' 55"}
SUN_DIST: 80.03 [deg] Sun_angle= 5.6 [hr] (West of Sun)
MOON_POSTN: 96.94d {+06h 27m 46s} +19.94d {+19d 56' 27"}
MOON_DIST: 76.80 [deg]
MOON_ILLUM: 96 [%]
GAL_COORDS: 267.79, 43.23 [deg] galactic lon,lat of the burst
ECL_COORDS: 173.51,-16.53 [deg] ecliptic lon,lat of the burst
COMMENTS: SWIFT-XRT Coordinates.
COMMENTS: The XRT position is 2.18 arcmin from the BAT position.
- GCN NOTICE
TITLE: GCN/SWIFT NOTICE
NOTICE_DATE: Tue 05 Dec 17 07:27:03 UT
NOTICE_TYPE: Swift-XRT Processed Image
TRIGGER_NUM: 794972, Seg_Num: 0
GRB_RA: 167.4144d {+11h 09m 39.4s} (J2000),
167.6393d {+11h 10m 33.4s} (current),
166.7876d {+11h 07m 09.0s} (1950)
GRB_DEC: -12.5857d {-12d 35' 08.5"} (J2000),
-12.6831d {-12d 40' 59.3"} (current),
-12.3143d {-12d 18' 51.5"} (1950)
GRB_ERROR: 4.7 [arcsec, radius, statistical plus systematic]
GRB_INTEN: 94 [cnts]
IMG_START_DATE: 18092 TJD; 339 DOY; 17/12/05
IMG_START_TIME: 26588.59 SOD {07:23:08.59} UT, 144.7 [sec] since BAT Trigger Time
CENTROID_X: 366.41, raw= 366 [pixels]
CENTROID_Y: 312.09, raw= 312 [pixels]
ROLL: 110.99 [deg]
GAIN: 1
MODE: 3, Long Image mode
WAVEFORM: 134
EXPO_TIME: 2.50 [sec]
GRB_POS_XRT_Y: 32.29
GRB_POS_XRT_Z: 141.47
IMAGE_URL: sw00794972000msxps_rw.img
SUN_POSTN: 251.95d {+16h 47m 47s} -22.40d {-22d 23' 55"}
SUN_DIST: 80.03 [deg] Sun_angle= 5.6 [hr] (West of Sun)
MOON_POSTN: 96.95d {+06h 27m 47s} +19.94d {+19d 56' 27"}
MOON_DIST: 76.80 [deg]
MOON_ILLUM: 96 [%]
GAL_COORDS: 267.79, 43.23 [deg] galactic lon,lat of the burst
ECL_COORDS: 173.51,-16.53 [deg] ecliptic lon,lat of the burst
COMMENTS: SWIFT-XRT Processed Image.
- GCN NOTICE
TITLE: GCN/SWIFT NOTICE
NOTICE_DATE: Tue 05 Dec 17 07:27:01 UT
NOTICE_TYPE: Swift-XRT Image
TRIGGER_NUM: 794972, Seg_Num: 0
GRB_RA: 167.4144d {+11h 09m 39.4s} (J2000),
167.6393d {+11h 10m 33.4s} (current),
166.7876d {+11h 07m 09.0s} (1950)
GRB_DEC: -12.5857d {-12d 35' 08.5"} (J2000),
-12.6831d {-12d 40' 59.3"} (current),
-12.3143d {-12d 18' 51.5"} (1950)
GRB_ERROR: 4.7 [arcsec, radius, statistical plus systematic]
GRB_INTEN: 94 [cnts]
IMG_START_DATE: 18092 TJD; 339 DOY; 17/12/05
IMG_START_TIME: 26588.59 SOD {07:23:08.59} UT, 144.7 [sec] since BAT Trigger Time
CENTROID_X: 366.41, raw= 366 [pixels]
CENTROID_Y: 312.09, raw= 312 [pixels]
ROLL: 110.99 [deg]
GAIN: 1
MODE: 3, Long Image mode
WAVEFORM: 134
EXPO_TIME: 2.50 [sec]
GRB_POS_XRT_Y: 32.29
GRB_POS_XRT_Z: 141.47
IMAGE_URL: sw00794972000msxps_rw.img
SUN_POSTN: 251.95d {+16h 47m 47s} -22.40d {-22d 23' 55"}
SUN_DIST: 80.03 [deg] Sun_angle= 5.6 [hr] (West of Sun)
MOON_POSTN: 96.94d {+06h 27m 47s} +19.94d {+19d 56' 27"}
MOON_DIST: 76.80 [deg]
MOON_ILLUM: 96 [%]
GAL_COORDS: 267.79, 43.23 [deg] galactic lon,lat of the burst
ECL_COORDS: 173.51,-16.53 [deg] ecliptic lon,lat of the burst
COMMENTS: SWIFT-XRT Image.
- GCN NOTICE
TITLE: GCN/SWIFT NOTICE
NOTICE_DATE: Tue 05 Dec 17 07:27:24 UT
NOTICE_TYPE: Swift-BAT GRB Lightcurve
TRIGGER_NUM: 794972, Seg_Num: 0
GRB_RA: 167.447d {+11h 09m 47s} (J2000),
167.672d {+11h 10m 41s} (current),
166.820d {+11h 07m 17s} (1950)
GRB_DEC: -12.604d {-12d 36' 12"} (J2000),
-12.701d {-12d 42' 03"} (current),
-12.332d {-12d 19' 55"} (1950)
GRB_DATE: 18092 TJD; 339 DOY; 17/12/05
GRB_TIME: 26443.89 SOD {07:20:43.89} UT
TRIGGER_INDEX: 20000
GRB_PHI: -2.22 [deg]
GRB_THETA: 44.44 [deg]
DELTA_TIME: 0.00 [sec]
TRIGGER_DUR: 64.000 [sec]
SOLN_STATUS: 0x13
RATE_SIGNIF: 0.00 [sigma]
IMAGE_SIGNIF: 9.46 [sigma]
LC_URL: sw00794972000msb.lc
SUN_POSTN: 251.95d {+16h 47m 47s} -22.40d {-22d 23' 55"}
SUN_DIST: 79.99 [deg] Sun_angle= 5.6 [hr] (West of Sun)
MOON_POSTN: 96.95d {+06h 27m 48s} +19.94d {+19d 56' 27"}
MOON_DIST: 76.83 [deg]
MOON_ILLUM: 96 [%]
GAL_COORDS: 267.84, 43.24 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS: 173.54,-16.53 [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 an image 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 = 11.57,1.84 [deg].
- GCN NOTICE
TITLE: GCN/SWIFT NOTICE
NOTICE_DATE: Tue 05 Dec 17 07:31:36 UT
NOTICE_TYPE: Swift-UVOT Source List
TRIGGER_NUM: 794972, Seg_Num: 0
POINT_RA: 167.449d {+11h 09m 48s} (J2000)
POINT_DEC: -12.609d {-12d 36' 32"} (J2000)
POINT_ROLL: 110.992d
IMG_START_DATE: 18092 TJD; 339 DOY; 17/12/05
IMG_START_TIME: 26597.39 SOD {07:23:17.39} UT, 153.5 [sec] since BAT Trigger Time
FILTER: 10, White
BKG_MEAN: 7.850
N_STARS: 16
X_OFFSET: 448 [pixels]
Y_OFFSET: 560 [pixels]
X_MAX: 1407 [pixels]
Y_MAX: 1519 [pixels]
DET_THRESH: 24
PHOTO_THRESH: 15
SL_URL: sw00794972000msufc0153.fits
SUN_POSTN: 251.95d {+16h 47m 48s} -22.40d {-22d 23' 56"}
SUN_DIST: 79.99 [deg] Sun_angle= 5.6 [hr] (West of Sun)
MOON_POSTN: 97.00d {+06h 27m 59s} +19.94d {+19d 56' 29"}
MOON_DIST: 76.80 [deg]
MOON_ILLUM: 96 [%]
GAL_COORDS: 267.85, 43.23 [deg] galactic lon,lat of the pointing direction
ECL_COORDS: 173.55,-16.54 [deg] ecliptic lon,lat of the pointing direction
COMMENTS: SWIFT-UVOT Source List.
- GCN NOTICE
TITLE: GCN/SWIFT NOTICE
NOTICE_DATE: Tue 05 Dec 17 07:31:53 UT
NOTICE_TYPE: Swift-UVOT Processed Source List
TRIGGER_NUM: 794972, Seg_Num: 0
POINT_RA: 167.449d {+11h 09m 48s} (J2000)
POINT_DEC: -12.609d {-12d 36' 32"} (J2000)
POINT_ROLL: 110.992d
IMG_START_DATE: 18092 TJD; 339 DOY; 17/12/05
IMG_START_TIME: 26597.39 SOD {07:23:17.39} UT, 153.5 [sec] since BAT Trigger Time
FILTER: 10, White
BKG_MEAN: 7.850
N_STARS: 16
X_OFFSET: 448 [pixels]
Y_OFFSET: 560 [pixels]
X_MAX: 1407 [pixels]
Y_MAX: 1519 [pixels]
DET_THRESH: 24
PHOTO_THRESH: 15
SL_URL: sw00794972000msufc0153.fits
SUN_POSTN: 251.95d {+16h 47m 48s} -22.40d {-22d 23' 57"}
SUN_DIST: 79.99 [deg] Sun_angle= 5.6 [hr] (West of Sun)
MOON_POSTN: 97.00d {+06h 28m 00s} +19.94d {+19d 56' 30"}
MOON_DIST: 76.79 [deg]
MOON_ILLUM: 96 [%]
GAL_COORDS: 267.85, 43.23 [deg] galactic lon,lat of the pointing direction
ECL_COORDS: 173.55,-16.54 [deg] ecliptic lon,lat of the pointing direction
COMMENTS: SWIFT-UVOT Processed Source List.
COMMENTS: All 4 attachments are included.
- GCN NOTICE
TITLE: GCN/SWIFT NOTICE
NOTICE_DATE: Tue 05 Dec 17 07:33:11 UT
NOTICE_TYPE: Swift-UVOT Image
TRIGGER_NUM: 794972, Seg_Num: 0
POINT_RA: 167.449d {+11h 09m 48s} (J2000)
POINT_DEC: -12.609d {-12d 36' 32"} (J2000)
ROLL: 110.992d
IMG_START_DATE: 18092 TJD; 339 DOY; 17/12/05
IMG_START_TIME: 26597.39 SOD {07:23:17.39} UT, 153.5 [sec] since BAT Trigger Time
FILTER: 10, White
EXPOSURE_ID: 534151417
X_OFFSET: 523 [pixels]
Y_OFFSET: 967 [pixels]
WIDTH: 160 [pixels]
HEIGHT: 160 [pixels]
X_GRB_POS: 683
Y_GRB_POS: 1127
BINNING_INDEX: 1
IM_URL: sw00794972000msuni0174.fits
SUN_POSTN: 251.95d {+16h 47m 48s} -22.40d {-22d 23' 57"}
SUN_DIST: 79.99 [deg] Sun_angle= 5.6 [hr] (West of Sun)
MOON_POSTN: 97.01d {+06h 28m 03s} +19.94d {+19d 56' 30"}
MOON_DIST: 76.78 [deg]
MOON_ILLUM: 96 [%]
GAL_COORDS: 267.85, 43.23 [deg] galactic lon,lat of the pointing direction
ECL_COORDS: 173.55,-16.54 [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: Tue 05 Dec 17 07:33:22 UT
NOTICE_TYPE: Swift-UVOT Processed Image
TRIGGER_NUM: 794972, Seg_Num: 0
POINT_RA: 167.449d {+11h 09m 48s} (J2000)
POINT_DEC: -12.609d {-12d 36' 32"} (J2000)
ROLL: 110.992d
IMG_START_DATE: 18092 TJD; 339 DOY; 17/12/05
IMG_START_TIME: 26597.39 SOD {07:23:17.39} UT, 153.5 [sec] since BAT Trigger Time
FILTER: 10, White
EXPOSURE_ID: 534151417
X_OFFSET: 523 [pixels]
Y_OFFSET: 967 [pixels]
WIDTH: 160 [pixels]
HEIGHT: 160 [pixels]
X_GRB_POS: 683
Y_GRB_POS: 1127
BINNING_INDEX: 1
IM_URL: sw00794972000msuni0174.fits
SUN_POSTN: 251.95d {+16h 47m 48s} -22.40d {-22d 23' 57"}
SUN_DIST: 79.99 [deg] Sun_angle= 5.6 [hr] (West of Sun)
MOON_POSTN: 97.02d {+06h 28m 04s} +19.94d {+19d 56' 30"}
MOON_DIST: 76.78 [deg]
MOON_ILLUM: 96 [%]
GAL_COORDS: 267.85, 43.23 [deg] galactic lon,lat of the pointing direction
ECL_COORDS: 173.55,-16.54 [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: Tue 05 Dec 17 07:33:40 UT
NOTICE_TYPE: Swift-UVOT Source List
TRIGGER_NUM: 794972, Seg_Num: 0
POINT_RA: 167.449d {+11h 09m 48s} (J2000)
POINT_DEC: -12.609d {-12d 36' 32"} (J2000)
POINT_ROLL: 110.992d
IMG_START_DATE: 18092 TJD; 339 DOY; 17/12/05
IMG_START_TIME: 26755.34 SOD {07:25:55.34} UT, 311.5 [sec] since BAT Trigger Time
FILTER: 7, U
BKG_MEAN: 1.147
N_STARS: 10
X_OFFSET: 203 [pixels]
Y_OFFSET: 647 [pixels]
X_MAX: 1162 [pixels]
Y_MAX: 1606 [pixels]
DET_THRESH: 9
PHOTO_THRESH: 4
SL_URL: sw00794972000msufc0311.fits
SUN_POSTN: 251.95d {+16h 47m 48s} -22.40d {-22d 23' 57"}
SUN_DIST: 79.99 [deg] Sun_angle= 5.6 [hr] (West of Sun)
MOON_POSTN: 97.02d {+06h 28m 05s} +19.94d {+19d 56' 31"}
MOON_DIST: 76.78 [deg]
MOON_ILLUM: 96 [%]
GAL_COORDS: 267.85, 43.23 [deg] galactic lon,lat of the pointing direction
ECL_COORDS: 173.55,-16.54 [deg] ecliptic lon,lat of the pointing direction
COMMENTS: SWIFT-UVOT Source List.
COMMENTS: The Pointing RA,Dec,Roll values came from the 1st SrcList Notice.
- GCN NOTICE
TITLE: GCN/SWIFT NOTICE
NOTICE_DATE: Tue 05 Dec 17 07:33:56 UT
NOTICE_TYPE: Swift-UVOT Processed Source List
TRIGGER_NUM: 794972, Seg_Num: 0
POINT_RA: 167.449d {+11h 09m 48s} (J2000)
POINT_DEC: -12.609d {-12d 36' 32"} (J2000)
POINT_ROLL: 110.992d
IMG_START_DATE: 18092 TJD; 339 DOY; 17/12/05
IMG_START_TIME: 26755.34 SOD {07:25:55.34} UT, 311.5 [sec] since BAT Trigger Time
FILTER: 7, U
BKG_MEAN: 1.147
N_STARS: 10
X_OFFSET: 203 [pixels]
Y_OFFSET: 647 [pixels]
X_MAX: 1162 [pixels]
Y_MAX: 1606 [pixels]
DET_THRESH: 9
PHOTO_THRESH: 4
SL_URL: sw00794972000msufc0311.fits
SUN_POSTN: 251.95d {+16h 47m 48s} -22.40d {-22d 23' 57"}
SUN_DIST: 79.99 [deg] Sun_angle= 5.6 [hr] (West of Sun)
MOON_POSTN: 97.02d {+06h 28m 05s} +19.94d {+19d 56' 31"}
MOON_DIST: 76.77 [deg]
MOON_ILLUM: 96 [%]
GAL_COORDS: 267.85, 43.23 [deg] galactic lon,lat of the pointing direction
ECL_COORDS: 173.55,-16.54 [deg] ecliptic lon,lat of the pointing direction
COMMENTS: SWIFT-UVOT Processed Source List.
COMMENTS: All 4 attachments are included.
- GCN NOTICE
TITLE: GCN/SWIFT NOTICE
NOTICE_DATE: Tue 05 Dec 17 07:35:03 UT
NOTICE_TYPE: Swift-UVOT Image
TRIGGER_NUM: 794972, Seg_Num: 0
POINT_RA: 167.449d {+11h 09m 48s} (J2000)
POINT_DEC: -12.609d {-12d 36' 32"} (J2000)
ROLL: 110.992d
IMG_START_DATE: 18092 TJD; 339 DOY; 17/12/05
IMG_START_TIME: 26755.34 SOD {07:25:55.34} UT, 311.5 [sec] since BAT Trigger Time
FILTER: 7, U
EXPOSURE_ID: 534151575
X_OFFSET: 523 [pixels]
Y_OFFSET: 967 [pixels]
WIDTH: 160 [pixels]
HEIGHT: 160 [pixels]
X_GRB_POS: 683
Y_GRB_POS: 1127
BINNING_INDEX: 1
IM_URL: sw00794972000msuni0332.fits
SUN_POSTN: 251.95d {+16h 47m 49s} -22.40d {-22d 23' 58"}
SUN_DIST: 80.00 [deg] Sun_angle= 5.6 [hr] (West of Sun)
MOON_POSTN: 97.03d {+06h 28m 08s} +19.94d {+19d 56' 31"}
MOON_DIST: 76.76 [deg]
MOON_ILLUM: 96 [%]
GAL_COORDS: 267.85, 43.23 [deg] galactic lon,lat of the pointing direction
ECL_COORDS: 173.55,-16.54 [deg] ecliptic lon,lat of the pointing direction
COMMENTS: SWIFT-UVOT Image.
COMMENTS: The Pointing RA,Dec,Roll values came from the 1st Image Notice.
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: Tue 05 Dec 17 07:35:13 UT
NOTICE_TYPE: Swift-UVOT Processed Image
TRIGGER_NUM: 794972, Seg_Num: 0
POINT_RA: 167.449d {+11h 09m 48s} (J2000)
POINT_DEC: -12.609d {-12d 36' 32"} (J2000)
ROLL: 110.992d
IMG_START_DATE: 18092 TJD; 339 DOY; 17/12/05
IMG_START_TIME: 26755.34 SOD {07:25:55.34} UT, 311.5 [sec] since BAT Trigger Time
FILTER: 7, U
EXPOSURE_ID: 534151575
X_OFFSET: 523 [pixels]
Y_OFFSET: 967 [pixels]
WIDTH: 160 [pixels]
HEIGHT: 160 [pixels]
X_GRB_POS: 683
Y_GRB_POS: 1127
BINNING_INDEX: 1
IM_URL: sw00794972000msuni0332.fits
SUN_POSTN: 251.95d {+16h 47m 49s} -22.40d {-22d 23' 58"}
SUN_DIST: 80.00 [deg] Sun_angle= 5.6 [hr] (West of Sun)
MOON_POSTN: 97.04d {+06h 28m 09s} +19.94d {+19d 56' 31"}
MOON_DIST: 76.76 [deg]
MOON_ILLUM: 96 [%]
GAL_COORDS: 267.85, 43.23 [deg] galactic lon,lat of the pointing direction
ECL_COORDS: 173.55,-16.54 [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 #22177
V. D'Elia (ASDC), A. D'Ai (INAF-IASFPA), A. Y. Lien (GSFC/UMBC) and
B. Sbarufatti (PSU) report on behalf of the Swift Team:
At 07:20:43 UT, the Swift Burst Alert Telescope (BAT) triggered and
located GRB 171205A (trigger=794972). Swift slewed immediately to the burst.
The BAT on-board calculated location is
RA, Dec 167.447, -12.604 which is
RA(J2000) = 11h 09m 47s
Dec(J2000) = -12d 36' 12"
with an uncertainty of 3 arcmin (radius, 90% containment, including
systematic uncertainty). As is usual with an image trigger, the available
BAT light curve shows no significant structure.
The XRT began observing the field at 07:23:08.5 UT, 144.7 seconds after
the BAT trigger. XRT found a bright, uncatalogued X-ray source located
at RA, Dec 167.4144, -12.5857 which is equivalent to:
RA(J2000) = +11h 09m 39.46s
Dec(J2000) = -12d 35' 08.5"
with an uncertainty of 5.0 arcseconds (radius, 90% containment). This
location is 132 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 153 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. The typical 3-sigma upper limit has been about 19.6 mag.
The 8'x8' region for the list of sources generated on-board covers 100% of the
XRT error circle. The list of sources is typically complete to about 18 mag. No
correction has been made for the expected extinction corresponding to E(B-V) of
0.05.
Burst Advocate for this burst is V. D'Elia (delia AT asdc.asi.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 Circular #22178
L. Izzo, D. A. Kann (both HETH/IAA-CSIC), J. P. U. Fynbo (DARK), A. J.
Levan (U. Warwick), and N. R. Tanvir (U. Leicester) note on behalf of the
Stargate Consortium:
The XRT position of GRB 171205A (V. D'Elia et al. GCN #22177) contains a
bright spiral galaxy 2MASX J11093966-1235116 which lies at z = 0.037
according to SIMBAD (6df Galaxy Catalog).
The combination of a BAT image trigger, a bright XRT afterglow and lack of
a bright optical afterglow may indicate a source similar to XRFs 060218
and 100316D.
Multiwavelength follow-up is encouraged.
- GCN Circular #22179
J.P. Osborne, A.P. Beardmore, P.A. Evans and M.R. Goad (U. Leicester)
report on behalf of the Swift-XRT team.
Using 1358 s of XRT Photon Counting mode data and 2 UVOT
images for GRB 171205A, 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 = 167.41406, -12.58891 which is equivalent
to:
RA (J2000): 11h 09m 39.37s
Dec (J2000): -12d 35' 20.1"
with an uncertainty of 2.3 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 #22180
L. Izzo (HETH/IAA-CSIC), J. Selsing (DARK), J. Japelj (API, Univ. Amsterdam), B.
Milvang-Jensen, J. P. U. Fynbo (both DARK), D. Xu (NAOC), D. A. Kann
(HETH/IAA-CSIC), N. R. Tanvir, R. Starling (both U. Leicester), A. J. Levan, K.
Wiersema (both U. Warwick), G. Pugliese (API, Univ. Amsterdam), V. D'Elia
(ASI-SSDC), and S. Campana (INAF-Brera) report on behalf of the Stargate
Consortium:
We observed the optical afterglow of GRB 171205A (V. D'Elia et al. GCN #22177)
with the ESO VLT/X-shooter spectrograph, covering the wavelength range
3500-20000 AA. Spectroscopy started at 08:56:18 UT on 2017-12-05 (i.e., 1.5 hr
after the GRB) and consisted of 1 exposure of 600 s taken in twilight.
From the acquisition image prior to the spectroscopy, a new optical transient is
clearly detected in the outskirts of the putative host galaxy (L. Izzo et al.
GCN #22178) at the following coordinates:
RA(J2000) = 11h 09m 39.573s Dec.(J2000) = -12d 35' 17.37"
This source is inside the error box reported by (J.P. Osborne et al. GCN
#22179). From the acquisition image we measure this source to have m(r)~16.0
mag, calibrated with a nearby Pan-STARRS star.
The source continuum is well detected across the entire spectral coverage and
clear emission lines are superposed on it identified as Halpha, [N II] 6584, and
[S II] 6717/32 located at z = 0.0368, suggesting an association with the nearby
galaxy. Additionally, a tentative detection of absorption lines identified as
NaI 5891/5897 in the continuum further supports z = 0.0368 as the redshift of
the GRB.
We acknowledge the excellent support from the ESO staff, particularly Jose
Velasquez and Zahed Wahhaj in obtaining these observations.
- GCN Circular #22181
S.W.K. Emery (UCL-MSSL) and V. D'Elia (ASDC)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 171205A
154 s after the BAT trigger (D'Elia et al., GCN Circ. 22177).
A source consistent with the XRT position
(J.P. Osborne et al. GCN Circ. 22179)
is detected in the initial UVOT exposures.
There is marginal evidence for brightening in the white filter.
The revised source position is
RA(J2000)=11:09:39.547
Dec.(J2000)=-12:35:17.93.
This position
is within the XRT error circle and is consistent with the VLT/X-shooter
optical position (L. Izzo et al. GCN Circ. 22180).
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_FC 154 303 147 18.10 +/- 0.08
white 3812 3849 36 17.70 +/- 0.09
u 312 390 78 17.78 +/- 0.18
v 4499 4698 197 18.22 +/- 0.15
b 3607 3807 197 18.45 +/- 0.09
uvw1 4908 5108 197 17.13 +/- 0.09
uvm2 4703 4903 197 17.11 +/- 0.11
uvw2 4294 4494 197 16.96 +/- 0.10
The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.05 in the direction of the burst
(Schlegel et al. 1998), nor from any contribution of the host galaxy.
- GCN Circular #22182
Nat Butler (ASU), Alan M. Watson (UNAM), 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 171205A (D'Elia, et al., GCN 22177) 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 2017/12 5.40 to 2017/12 5.53 UTC (2.15 to
5.36
hours after the BAT trigger), obtaining a total of 1.44 hours exposure in
the r and i bands and 0.71 hours exposure in the Z and Y bands.
In comparison with the USNO-B1 and 2MASS catalogs, we detect and obtain the
following photometry for the source reported by Izzo et al. (GCN 22180):
r =3D 18.30 +/- 0.05
i =3D 18.13 +/- 0.02
Z =3D 18.35 +/- 0.05
Y =3D 18.13 +/- 0.05
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.
- GCN Circular #22183
J.A. Kennea (PSU), B. Sbarufatti (INAF-OAB/PSU), D.N. Burrows (PSU),
P.A. Evans (U. Leicester), S.L. Gibson (U. Leicester), J.P. Osborne (U.
Leicester), A. Melandri (INAF-OAB), P. D'Avanzo (INAF-OAB) and V.
D'Elia report on behalf of the Swift-XRT team:
We have analysed 6.6 ks of XRT data for GRB 171205A (D'Elia et al. GCN
Circ. 22177), from 134 s to 22.5 ks after the BAT trigger. The data
comprise 238 s in Windowed Timing (WT) mode (the first 9 s were taken
while Swift was slewing) with the remainder in Photon Counting (PC)
mode. The enhanced XRT position for this burst was given by Osborne et
al. (GCN Circ. 22179).
The light curve can be modelled with a series of power-law decays. The
initial decay index is alpha=1.84 (+0.10, -0.18). At T+289 s the decay
steepens to an alpha of 2.43 (+0.09, -0.08) before breaking again at
T+5714 s to a final decay with index alpha=-0.16 (+0.28, -0.69).
A spectrum formed from the WT mode data can be fitted with an absorbed
power-law with a photon spectral index of 1.717 (+0.035, -0.024). The
best-fitting absorption column is consistent with the Galactic value
of 5.9 x 10^20 cm^-2 (Willingale et al. 2013). The counts to observed
(unabsorbed) 0.3-10 keV flux conversion factor deduced from this
spectrum is 3.7 x 10^-11 (4.1 x 10^-11) erg cm^-2 count^-1.
A summary of the WT-mode spectrum is thus:
Galactic foreground: 5.9 x 10^20 cm^-2
Intrinsic column: 5.89 (+/-0.22) x 10^20 cm^-2 at z=0.0368
Photon index: 1.717 (+0.035, -0.024)
If the light curve continues to decay with a power-law decay index of
-0.16, the count rate at T+24 hours will be 0.025 count s^-1,
corresponding to an observed (unabsorbed) 0.3-10 keV flux of 9.1 x
10^-13 (1.0 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/00794972.
This circular is an official product of the Swift-XRT team.
- GCN Circular #22184
S. D. Barthelmy (GSFC), J. R. Cummings (CPI),
V. D'Elia (ASDC), 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-239 to T+963 sec from the recent telemetry downlink,
we report further analysis of BAT GRB 171205A (trigger #794972)
(D'Elia et al., GCN Circ. 22177). The BAT ground-calculated position is
RA, Dec = 167.423, -12.599 deg which is
RA(J2000) = 11h 09m 41.5s
Dec(J2000) = -12d 35' 58.0"
with an uncertainty of 1.6 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 46%.
The mask-weighted light curve shows some weak emissions with multiple
overlapping peaks that starts at ~ T-40 s and ends at ~ T+200 s. The burst
went out of the BAT FOV at T+478 s. T90 (15-350 keV) is 189.4 +- 35.0 sec
(estimated error including systematics).
The time-averaged spectrum from T-42.23 to T+197.80 sec is best fit by a simple
power-law model. The power law index of the time-averaged spectrum is
1.41 +- 0.14. The fluence in the 15-150 keV band is 3.6 +- 0.3 x 10^-6 erg/cm2.
The 1-sec peak photon flux measured from T+49.08 sec in the 15-150 keV band
is 1.0 +- 0.3 ph/cm2/sec. All the quoted errors are at the 90% confidence
level.
Assuming z = 0.0368 (Izzo et al., GCN Circ. 22180) and a standard cosmology model
with H_0 = 70.5 km/s/Mpc, Omega_M = 0.274, Omega_\Lambda = 0.726 (Spergel et al. 2007),
the isotropic energy release Eiso (in the observed 15-150 keV band) is 5.72e+49 erg.
This Eiso is similar to other low-luminosity GRBs. For example, the Eiso
(in the observed 15-150 keV band) for GRB060218 is 2.57e+49 erg (assuming
T90 = 2100 s based on Campana et al. 2006) and GRB100316D has Eiso >= 3.70e+49 erg
(assuming T90 >= 1300 s based on Starling et al. 2011).
The results of the batgrbproduct analysis are available at
http://gcn.gsfc.nasa.gov/notices_s/794972/BA/
- GCN Circular #22186
J. Mao, X. Ding and J.-M. Bai (YNAO) report:
We observed the field of GRB 171205A (D'Elia et al., GCN 22177) with the 2.4-meter optical telescope at Gao-Mei-Gu (GMG) station of Yunnan Observatories. Observations began from 22:45:21 UT, about 15.4 hours after the trigger. We clearlydetected the optical counterpart reported by Izzo et al. (GCN 22180). A very preliminary result was estimated as R~20.4 mag. We note that this source is in the outskirts of the host galaxy and the magnitude that we roughly measured has large uncertainty. Detailed analysis is ongoing.
- GCN Circular #22187
A. de Ugarte Postigo (HETH/IAA-CSIC, DARK/NBI),=20
S. Schulze (Weizmann), M. Bremer, M. Krips (IRAM),=20
C.C. Thoene, L. Izzo, D.A. Kann, Z. Cano, K. Bensch=20
(HETH/IAA-CSIC), S. Martin Ruiz, I. de Gregorio (ALMA),=20
S. Kim (PUC), R. S=E1nchez-Ramirez (INAF-IAPS),=20
D. Malesani (DARK/NBI) report:
We observed the afterglow of GRB 171205A with=20
NOEMA at 150GHz and 90GHz starting at 3:30 UT on the=20
6th of December (20.2 hrs after the GRB onset). We=20
detect a bright afterglow in 150GHz with a preliminary=20
flux density estimate of 35-40 mJy. The coordinates=20
of the detected source are (J2000 +/- 0.05"):
R.A.: 11:09:39.52
Dec.: -12:35:18.34
We note that if the flux density is confirmed, it would be=20
the second brightest GRB ever detected in mm/submm=20
wavelengths, after GRB 030329 (for a review on=20
mm/submm data of GRBs see de Ugarte Postigo et al.=20
2012).
Further follow-up observations are encouraged.
- GCN Circular #22188
Changsu Choi, Myungshin Im (CEOU/SNU), on behalf of a larger collaboration
We observed the field of GRB 171205A (D'Elia et al., GCN 22177) with
SNUCAM-II (Choi & Im 2017, JKAS, 50, 71) on the 0.43m Lee Sang Gak
Telescope (LSGT; Im et al. 2015, JKAS, 48. 207) at the Siding Spring
Observatory in Australia. The observation started at about 9 hours after
the BAT alert, using r, i, z (broad-band), m425, m475, m525, m575, and m625
(medium-band) filters.
We clearly identify the optical afterglow in these bands, and preliminary
photometry results in r, i, and z filters are reported below. Note that the
photometric calibration is based on stars from the Pan-Starrs catalog in
the vicinity of GRB 171205A, and systematic errors due to host galaxy
subtraction uncertainty could amount to a few tenths of magnitude.
Filter Mag err UT(center)
r18.0 0.1 2017-12-05T16:17:17
i 18.1 0.1 2017-12-05T16:26:55
z 18.3 0.2 2017-12-05T16:36:33
Further observations and analysis are being carried out.
- GCN Circular #22189
A. Melandri, P. D'Avanzo (INAF-OAB), L. di Fabrizio, C. Padilla (INAF-TNG), V. D'Elia (ASI/ASDC) report on behalf of the CIBO collaboration:
We observed the field of GRB 171205AA (D'Elia et al. GCN 22177) with the 3.6m Telescopio Nazionale Galileo (TNG) equipped with NICS. Observations were carried out in the near-infrared with the JHK filter, starting on Dec 06 at 05:25:09 UT (~0.92 days after the burst) and consisted in a series of images for a total exposure time of 15 minutes per filter.
We clearly detect the optical counterpart (Izzo et al. GCN 22180; Emery & D'Elia GCN 22181; Butler et al. GCN 22182; Mao et al. 22186; de Ugarte Postigo et al. GCN 22187; Choi et al. GCN 22188) in each filter. In our preliminary analysis the source is detected with a magnitude of J = 16.7 +/- 0.1 at a mid time of 0.922 days from the burst event (calibrated against nearby stars reported in the 2MASS catalogue).
Further observations are planned.
- GCN Circular #22190
D.Steeghs, R.Cutter, K.Ulaczyk, D.Pollacco, R.West, A.Levan, J.Lyman, P.C=
hote, J.McCormac, K.Wiersema (U. Warwick)
G.Ramsay (Armagh O.)
R.Starling, P.O'Brien, R.Eyles (U. Leicester)
D.K.Galloway, E.Rol, E.Thrane, K.Ackley, A.Casey (Monash U.)
V.Dhillon, M.Dyer, S.Littlefair, E.Daw, J.Mullaney, L.Makrygianni, J.Maun=
d (U. Sheffield)
S.Poshyachinda, S.Aukkaravittayapun, U.Sawangwit, S.Awiphan, D.Mkrtichian=
(NARIT)
report on behalf of the GOTO collaboration:
The Gravitational-wave Optical Transient Observer observed the field of GRB 171205A (trigger=3D794972, D'Elia et al. GCN Circ. 22177) from Roque de los Muchachos Observatory beginning at 2017-12-06T04:24:31 UT, 21.07 hours since burst, in several wide-band filters.
In a combined L-band image (400-700nm passband), with a total exposure time of 1440s at a mid-time 04:57:38 UT, 21.36 hours since burst, we detect the optical counterpart (Selsing et al. GCN Circ. 22180; Emery & D'Elia
GCN Circ. 22181; Butler et al. GCN Circ. 22182; Mao et al. GCN Circ. 22186; Choi & Im GCN Circ. 22188) with a preliminary magnitude of V=3D18.95 +/- 0.15 based on a comparison to APASS V-band calibrators. Galaxy contamination is likely leading to an additional systematic uncertainty.
An image can be viewed here:
http://www.arm.ac.uk/~gar/GRB171205A-goto.jpg
Further observations are scheduled.
GOTO is operated at the La Palma observing facilities of the University of Warwick on behalf of a consortium including the University of Warwick,
Monash University, Armagh Observatory, the University of Leicester, the University of Sheffield, the National Astronomical Research Institute of Thailand (NARIT) and the Instituto de Astrof=EDsica de Canarias (IAC)
(https://goto-observatory.org)
GOTO Observatory
goto-observatory.org
The first GOTO dome at Roque de Los Muchachos observatory on La Palma. About. The Gravitational-wave Optical Transient Observer (GOTO) is a project to identify ...
- GCN Circular #22191
S. Campana (INAF-OAB), A. Beardmore (U. Leicester), A. D'Ai (INAF-IASFPA),
V. D'Elia (ASDC), P. Evans (U. Leicester), J. Kennea (PSU), J.P. Osborne
(U. Leicester), K.L. Page (U. Leicester), R.L.C. Starling (U. Leicester)
report on a preliminary analysis of the Swift XRT data. Swift XRT started
observing GRB171205A (D'Elia et al. 2017, GCN 22177) 145 s after the
trigger.
XRT detected a bright X-ray source decreasing from ~80 c/s to ~10 c/s
from 150 s to 400 s, remaining in Windowed Timing (WT) mode (Kennea et al.
2017, GCN 22183).
The hardness ratio light curve does not imply appreciable spectral
variations during this time interval.
We fit the WT spectrum binned to 20 counts per energy bin with an absorbed
power law (with the column density fixed to 5.9e20 cm-2, Willingale et al.
2013, MNRAS 431 394).
We obtain a reduced chi2=1.23 (239 degrees of freedom, dof, and 9e-3 null
hypothesis probability, nhp).
The inclusion of an intrinsic absorption component at the GRB redshift
(z=0.0368, Izzo et al. 2017, GCN 22180) does not improve the fit, rather
we can only put a 90% confidence level upper limit of N_H(z)<0.3e20 cm-2.
Given the relatively low nhp of the fit we include a soft blackbody
component.
The fit improves considerably with kT_BB=0.10+-0.02 keV (90% c.l.) and
equivalent radius R_BB~5e11 cm (for a source distance of 163 Mpc).
The fit is good with a reduced chi2=1.09 (237 dof and 0.15 nhp).
F-test provides a probability for a chance improvement of 6e-8.
The 0.3-10 keV blackbody contribution to the total flux is ~4%.
We checked that the fit does not improve using different values for the
Galactic column density (NH_DL=4.82e20 cm-2 or NH_Kalberla=4.91e20
cm-2), reaching similar results.
Using a spectrum made from grade 0 events does not change the
results and the blackbody component is still significant.
- GCN Circular #22192
B. E. Cobb (GWU), reports:
Using the ANDICAM instrument on the 1.3m telescope at CTIO, we
obtained optical/IR imaging of the error region of GRB 171205A
(GCN 22177, D'Elia et al.) with a mid-exposure time of about
24.5 hrs post-burst (2017-12-06 07:50 UT). Total summed exposure
times amounted to 15 min in V and I and 12 min in J and K.
The afterglow of GRB 171205A (e.g. GCN 22179, Osborne et al.;
GCN 22180, Izzo et al.; GCN 22181, Emery et al.) was detected
with the following preliminary magnitudes:
V mag = 18.5 +/- 0.1
I mag = 17.7 +/- 0.1
J mag = 17.6 +/- 0.1
K mag = 16.2 +/- 0.1
(Optical photometry is calibrated against Landolt standard stars
and IR photometry is calibrated against 2MASS stars in the
field.)
- GCN Circular #22193
A. Volnova (IKI), A. Pozanenko (IKI), E. Mazaeva (IKI), M. Krugov
(AFIF) report on behalf of IKI-GW follow-up collaboration:
We observed the field of GRB 171205A (D'Elia et al., GCN 22177) with
RC-1000 1m telescope of CHILESCOPE observatory. The observations carried
out in a clear filter starting on Dec. 06 (UT) 06:46:47. The afterglow
of GRB 171205A (e.g. Osborne et al., GCN 22179; Izzo et al., GCN
22180; Emery et al., GCN 22181) is clearly detected. Preliminary
photometry is following.
Date UT start t-T0 Filter Exp. OT Err.
(mid, days) (s)
2017-12-06 06:46:47 1.00122 CR 3600 18.20 0.07
The photometry is based on several nearby USNO-B1.0 stars (R2 magnitudes).
USNO-B1.0 RA Dec R2
0774-0291882 11:09:46.28 -12:35:02.8 17.25
0773-0296803 11:09:34.42 -12:37:07.2 16.58
0774-0291827 11:09:37.14 -12:32:33.8 16.45
0774-0291826 11:09:36.63 -12:34:12.4 16.40
0774-0291864 11:09:43.12 -12:33:49.8 16.30
0774-0291938 11:09:56.38 -12:35:37.7 16.40
0773-0296901 11:09:57.46 -12:36:29.0 15.34
Finding chart can be found at
http://grb.rssi.ru/GRB171205A/GRB171205_RC1000-171206.png
- GCN Circular #22194
D. A. Perley and K. Taggart (LJMU) report:
We downloaded public, pre-explosion survey data covering the field of
GRB 171205A (D'Elia et al., GCN 22177) from a number of public archives:
GALEX (Martin et al. 2005, ApJL 619 1), Pan-STARRS 1 (Chambers et al.
2016, arXiv:1612.05560), and 2MASS (Skrutskie et al. 2006, 131 1163).
Photometry of the presumed host galaxy (2MASX J11093966-1235116; Kann et
al., GCN 22178) was obtained from the relevant photometric catalogs for
2MASS (Huchra et al. 2012, ApJS 199 26) and GALEX (Bianchi et al. 2011,
MNRAS 411 2770). For Pan-STARRS 1, we performed elliptical aperture
photometry on the images ourselves (using a semimajor axis of 19.35" and
axis ratio 0.6) using PS1 field stars for calibration.
We fit the combined SED (including 10 filters: GALEX FUV and NUV,
Pan-STARRS g, r, i, z, and y, and 2MASS J, H, and Ks) using the SED
fitting package LePHARE (Arnouts et al. 1999, MNRAS 310 540; Ilbert et
al. 2006, A&A 457 841). A redshift of z=0.037 was assumed (Izzo et al.,
GCN 22180), and Galactic foreground extinction was taken to be
E(B-V)=0.045 (Schlafly et al. 2011; ApJ 737 103). We obtain a stellar
mass of log10(M/Msun) = 10.1 +/- 0.1 and a star-formation rate of SFR =
3 +/- 1 Msun/yr.
This host mass is much larger than that of any other low-redshift GRB
with a confirmed SN counterpart. The next-most-massive SN/GRB host is
that of GRB 120422A (SN 2012bz), with log10(M)~9.0.
In contrast, the majority of low-z (z<0.4) long-duration (>2s) GRBs with
no unambiguous observed SNe are in massive hosts similar to this event.
These include GRBs 060505 (Fynbo et al. 2006, Nature 444 1047), 051109B
(Perley et al., GCN 5387), 050219A (Rossi et al. 2014, A&A 572), 050826
(Mirabal et al. 2007, ApJ 661, 127), 080517 (Stanway et al. 2015, MNRAS
226 3911), and possibly 150518A (cf GCN 17903, Pozanenko et al). In
many of these cases an SN was not searched for to deep limits, and
others could be attributed to host extinction, an ambiguous duration
possibly consistent with the "short" GRB class, or confusion of a high-z
GRB with a foreground galaxy.
Nevertheless, it remains possible that host mass (and perhaps
metallicity) is closely connected to whether a luminous SN emerges from
a GRB explosion. The very long duration, bright UV counterpart, and
early spectroscopy of GRB 171205A all suggest that this is a genuine
(albeit low-luminosity) long GRB and is not extinguished or at high-z,
and it is in a high-mass galaxy (although its position is at the outer
edge of the disk). Whether or not an SN emerges from this GRB
represents an important test of the tentative host dichotomy suggested
by previous events. We encourage observers to monitor the photometric
evolution carefully over the coming days and obtain deep, multiband
photometry and spectroscopy, especially if a clear rising SN does not
emerge.
- GCN Circular #22195
J. Mao, X. Ding and J.-M. Bai (YNAO) report:
We observed the field of GRB 171205A (D'Elia et al., GCN 22177) with the 2.4-meter optical telescope at Gao-Mei-Gu (GMG)
station of Yunnan Observatories, beginning from 22:04:14 UT, 6th, Dec., 2017, about 1.6 days after the trigger. We still clearly detected the optical counterpart. Some preliminary results were roughly estimated as B~20.7, V~20.0, and R~20.7 mag. The brightness might be underestimated due to poor seeing. Although the magnitudes we measured have large uncertainty, we compare our observation of the first night (Mao et al. GCN 22186), and it seems that the source has no significant fading evidence.
- GCN Circular #22196
Dado, Dar and De Rujula report:
The very bright radio afterglow^1 of the far off-axis (low luminosity)
GRB171205A at the outskirts of its host galaxy^2 at redshift z=0.0368
(agular distance Da~ 150 Mpc), provides another rare opportunity, like
GRBs^3 980425 and 030329, to measure the apparent hyperluminal separation
of the jet-produced afterglow from the anticipated supernova, which
launched it^3. The CB model relation Ep \propto Eiso^{1/3} for far
off-axis GRBs^4, and its estimated isotropic energy release in the
observed 15-150 keV band^5, Eiso~ 5.7E49 erg, yield, in the CB model^3,
Ep~100 keV, viewing angle of @~(2/Ep(eV))^1/2~4.5 mrad, and a hyperluminal
velocity^3 V~ 2c/@ ~450c.
With such a hyperluminal velocity, the radio afterglow separation from the
SN, which launched it, will reach ~ 200 mas! after a year, easily resolved
in VLBI and VLA radio follow-up observations.
If the afterglow of GRB171205A was a SN-less^6 GRB, produced by a highly
relativistic jet launched in a phase transition of a neutron star
(to quark star ?), the above estimate will not be valid for the separation
of the radio afterglow from the GRB position, if its late-time afterglow
was produced by a highly magnetized millisecond pulsar^7 (MSP).
We strongly urge VLA and VLBI follow up observations of the radio
afterglow of GRB171205A.
1. A. de Ugarte Postigo, et al. GCN 22187
2. L. Izzo, et al. GCN 22180
3. S. Dado, A. Dar and A. De Rujula, arXiv:1610.01985
4. S. Dado and A. Dar, arXiv:1708.04603
5. S. D. Barthelmy, et al. GCN 22184
6. D. A. Perley and K. Taggart GCN 22194
7. S. Dado, A. Dar arXiv:1710.02456
- GCN Circular #22197
C. Guidorzi (U. Ferrara), S. Kobayashi (LJMU), C.G. Mundell (U. Bath),
A. Gomboc (U. Nova Gorica), I.A. Steele (LJMU) on behalf of a large
collaboration report:
We observed Swift GRB171205A (D'Elia et al. GCN 22177) on December 7,
07:21 UT (2.0 days post burst) with one of the 1-m LCO telescopes in
Cerro Tololo in the SDSS ri filters. We clearly detect the optical
afterglow (Izzo et al. GCN 22180; Emery et al. GCN 22181; Butler et al.
GCN 22182; Mao et al. GCN 22186; Choi et al. GCN 22188; Melandri et al.
GCN 22189; Steeghs et al. GCN 22190; Cobb et al. GCN 22192; Volnova et
al. GCN 22193) with the following magnitudes:
Mid Time=A0=A0=A0=A0 Exposure=A0=A0=A0=A0=A0=A0 Filter=A0=A0=A0=A0=A0=A0 =
Magnitude (AB)
(days)=A0=A0=A0=A0=A0=A0=A0 (s)
-------------------------------------------------------
2.0=A0=A0=A0=A0=A0=A0=A0=A0=A0 5x120=A0=A0=A0=A0=A0=A0=A0=A0=A0 SDSS-R=A0=
=A0=A0=A0=A0=A0=A0 19.43 +- 0.10
2.0=A0=A0=A0=A0=A0=A0=A0=A0=A0 5x120=A0=A0=A0=A0=A0=A0=A0=A0=A0 SDSS-I=A0=
=A0=A0=A0=A0=A0=A0 19.19 +- 0.10
-------------------------------------------------------
as calibrated against nearby Pan-STARRS objects.
- GCN Circular #22198
S. Schmidl (TLS Tautenburg) and P. Schady (MPE Garching) report:
We observed the field of GRB 171205A (Swift trigger 794972; D'Elia et al.,
GCN 22177) 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 07:30 UT on December 05, 2017, 10 minutes after
the GRB trigger. They were performed at an average seeing of 1.5" and at
an average airmass of 1.5.
We clearly detect the optical/NIR transient of GRB 171205A (Izzo et al.,
GCN 22180; Emery & D'Elia, GCN 22181; Butler et al., GCN 22182; Mao et
al., GCN 22186; de Ugarte Postigo et al., GCN 22187; Choi et al., GCN
22188; Melandri et al., GCN 22189; Steeghs et al., GCN 22190; Cobb et al.,
GCN 22192; Volnova et al., GCN 22193; Guidorzi et al., GCN 22197).
Based on total exposures of 66 seconds in g'r'i'z', 60 seconds in JH and
180 seconds in K at a midtime of 0.36 hours after the burst, we measure
the following preliminary magnitudes and upper limits (AB magnitude
system):
g' = 19.1 +/- 0.1 mag,
r' = 18.9 +/- 0.1 mag,
i' = 18.9 +/- 0.1 mag,
z' = 18.8 +/- 0.1 mag,
J = 18.4 +/- 0.2 mag,
H = 18.2 +/- 0.3 mag, and
K > 17.6 mag.
Magnitudes and upper limits are calibrated against PanSTARRS and 2MASS
field stars and are not corrected for the Galactic foreground extinction
corresponding to a reddening of E_(B-V)= 0.05 mag in the direction of the
burst (Schlegel et al. 1998).
Observations are continuing.
- GCN Circular #22199
V. Lipunov, E. Gorbovskoy, V.Kornilov, N.Tyurina, D.Kuvshinov, A.V.Krylov,
I.Gorbunov, P.Balanutsa, A.Kuznetsov, V.V.Chazov, D. Vlasenko
Lomonosov Moscow State University, Sternberg Astronomical Institut of MSU
D.Buckley, S. Potter, A.Kniazev, M.Kotze
South African Astronomical Observatory
R. Rebolo, M. Serra, N. Lodieu, G. Israelian, L. Suarez-Andres
The Instituto de Astrofisica de Canarias
R.Podesta, C.Lopez, F. Podesta Observatorio Astronomico Felix Aguilar (OAFA),
National University of San Juan, Argentina
H. Levato, C. Saffe
Instituto de Ciencias Astronomicas,de la Tierra y del Espacio (ICATE),
San Juan, Argentina
O.Gres, K.Ivanov, S.Yazev, N.M.Budnev, O.Gres, O.Chuvalaev, V.A.Poleshchuk,
Irkutsk State University
V.Yurkov, Yu.Sergienko
Blagoveschensk Educational State University, Blagoveschensk
A. Tlatov, V.Senik, A.V. Parhomenko, D. Dormidontov
Kislovodsk Solar Station of the Pulkovo Observatory
MASTER-SAAO telescope observed Swift GRB171205A (D'Elia et al., GCN Circ.
22177) since 2017-12-06 23:53:47UT.
There were 20 images with 180s exposition in B and unfiltered (W=0.2B+0.8R
calibrated by USNO-B1) .
MASTER-SAAO auto-detection system detected optical transient ((Izzo et
al. GCN 22180; Emery et al. GCN 22181; Butler et al. GCN 22182; Mao et al.
GCN 22186; Choi et al. GCN 22188; Melandri et al. GCN 22189; Steeghs et
al. GCN 22190; Cobb et al. GCN 22192, Schmidl et al. GCN22198) several
filters. The unfriltered magnitude is about ~ 19.4 mag .
We note that absolute magnitude is about -16.5.
The dicovery image is available at
http://observ.pereplet.ru/images/MASTERGRB171205A.jpg
This message can be cited.
- GCN Circular #22202
M. H. Siegel (PSU), P. J. Brown (Mitchell Institute, TAMU),
S.W.K. Emery (UCL-MSSL) and V. D'Elia (ASDC)
report on behalf of the Swift/UVOT team:
The Swift/UVOT has continued observations of the optical transient in
GRB 171205A (D=E2=80=99Elia et al., GCN Circ. 22177). We find that photometry
in the optical passbands is consistent with either steady flux or slight
decline, consistent with the report of Mao et al. (GCN Circ. 22195). However,
all four UV passbands show a significant decay over the first day of
observations. 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 155 3850 183 18.05+-0.07
white 5524 28415 1081 17.85+-0.05
white 188009 193590 703 18.58+-0.08
v 5934 22497 903 18.09+-0.08
v 46094 57628 150 18.26+-0.24
v 74068 142426 350 18.20+-0.12
b 3608 3808 196 18.69+-0.10
b 26595 27502 885 18.53+-0.06
b 38171 61189 254 18.43+-0.08
b 67064 141691 379 18.69+-0.08
u 312 391 77 17.75+-0.18
u 16032 16558 513 17.54+-0.06
u 38114 61132 254 17.66+-0.08
u 67030 141669 379 18.32+-0.09
uvm2 9466 10366 885 16.67+-0.06
uvm2 46150 57780 435 18.37+-0.15
uvm2 74102 142498 1315 18.71+-0.11
uvw1 10373 16025 1066 16.95+-0.06
uvw1 38031 61074 383 17.93+-0.10
uvw1 66981 141647 568 18.51+-0.11
uvw2 5729 28438 1098 17.06+-0.07
uvw2 40218 141597 2322 18.68+-0.08
uvw2 73989 142404 877 18.82+-0.12
The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) =3D 0.05 in the direction of the burst
(Schlegel et al. 1998), nor from any contribution of the host galaxy.
- GCN Circular #22204 / ATEL #11038
A. de Ugarte Postigo (HETH/IAA-CSIC, DARK/NBI), L. Izzo (HETH/IAA-CSIC),
D.A. Kann (HETH/IAA-CSIC), C.C. Thoene (HETH/IAA-CSIC), P. Pesev (GTC),
R. Scarpa (GTC), D. Perez (GTC) report on behalf of a larger collaboration:
We have been monitoring the counterpart of GRB 171205A (D'Elia et al.
GCN22177; Izzo et al., GCN 22180) photometrically and spectroscopically
with OSIRIS at the 10.4m GTC telescope. Our latest observation consisted of
3x600s exposure using the R1000B grism, which covers the spectral range
between 3700 and 7880 Angstrom. On the combined spectrum, with epoch on
the 7th of December at 6:05 UT, we detect broad undulating spectral features,
which are prominent between 4000 and 6000 Angstrom, superposed to the
afterglow continuum, which seem to indicate the emergence of an underlying
supernova component. The features include a double bump in this range,
similar to what was seen for the very early spectra of SN 1998bw (Patat et al.
2001), indicating that this is probably also a broad line Ic supernova.
Further information will be provided through the TNS.
- GCN Circular #22205
A. Volnova (IKI), A. Pozanenko (IKI), E. Mazaeva (IKI), M. Krugov (FAPHI),
I. Reva (FAPHI), A. Kusakin (FAPHI), report on behalf of larger GRB
follow-up collaboration:
We observed the field of GRB 171205A (D'Elia et al., GCN 22177) with
Zeiss-1000 1-m telescope of Tien Shan Astronomical Observatory starting on
Dec. 06 (UT) 22:2319. We took several images in R-filter. The afterglow of
GRB 171205A (Izzo et al. GCN 22180; Emery et al. GCN 22181; Butler et al.
GCN 22182; Mao et al. GCN 22186; Choi et al. GCN 22188; Melandri et al. GCN
22189; Steeghs et al. GCN 22190; Cobb et al. GCN 22192; Volnova et al. GCN
22193; Guidorzi et al. GCN 22197; Schmidl et al. GCN 22198; Lipunov et al.
GCN 22199; Ugarte Postigo et al. GCN 22204) is marginally detected.
Preliminary photometry is following.
Date UT start t-T0 Filter Exp. OT Err.
(mid, days) (s)
2017-12-06 22:23:19 1.63574 R 1500 20.4 0.3
The photometry is based on several nearby USNO-B1.0 stars previously used in
GCN 22193.
- GCN Circular #22215
T. Laskar (NRAO / UC Berkeley), W.Fong (Northwestern University), P. Milne,
and N. Smith (University of Arizona) report:
"We observed GRB 171205A (D'Elia et al., GCN 22177) with the Wide Field
Camera (WFCAM) mounted on the 3.8-m United Kingdom Infrared Telescope
(UKIRT) on Mauna Kea beginning on 2017 December 8.595 UT (3.29 days
post-burst) in the J- and K-bands. Using the quick-look pipeline ORAC-DR,
we clearly detect the near-IR counterpart, consistent with the XRT and
optical position (Osborne et al.; GCN 22179, Izzo et al.; GCN 22180, Emery
et al.; GCN 22181). We estimate the following preliminary photometry at the
position of the near-IR afterglow, calibrated to 2MASS and converted to the
AB system:
J(AB) = 18.5 +/- 0.1 mag
K(AB) = 18.3 +/- 0.1 mag
We note that these magnitudes may have a non-negligible contribution from
the host galaxy. Further observations are planned to track the brightness
evolution and determine the galaxy contribution. We thank Watson Varricatt
and Sam Benigni for their assistance in planning and executing these
observations."
- GCN Circular #22216
T. Laskar (NRAO / UC Berkeley), D. L. Coppejans, R. Margutti (Northwestern
University), and K. D. Alexander (Harvard) report on behalf of a larger
collaboration:
"The VLA observed GRB 171205A (D'Elia et al.; GCN 22177) at multiple
frequencies from 4.49 GHz to 16.38 GHz beginning on 2017 December 9.58 UT
(4.3 days after the burst). At a mean frequency of 6 GHz, we detect a radio
source with a preliminary flux density of ~ 3 mJy at
RA = 11:09:39.5182 +/- 0.0001
Dec = -12:35:18.480 +/- 0.002
consistent with the Swift/XRT position (Osborne et al.; GCN 22179) and the
optical position (Izzo et al.; GCN 222180, Emery et al.; GCN 22181). The
spectral index is steeply rising to higher frequencies as nu^2, suggesting
a self-absorbed spectrum. Follow-up observations are planned. We thank the
VLA staff for rapidly scheduling and executing these service observations."
- GCN Circular #22222
Poonam Chandra (NCRA-TIFR, Stockholm University), A. J. Nayana
(NCRA-TIFR), Dipankar Bhattacharya (IUCAA), S. Bradley Cenko (NASA) and
Alessandra Corsi (Texas Tech University) report:
We observed GRB 171205A (D'Elia et al., GCN Circ. 22177) with the Giant
Metrewave Radio Telescope (GMRT) on 2017 Dec 10.07 UT at 1400 MHz band.
Our preliminary analysis results in a non-detection. The 3-sigma upper
limit on the GRB position (Laskar et al. GCN 22216) is 180 uJy. This
could be because the radio emission may be absorbed at low frequencies.
More detailed analysis of the data is in progress.
More observations are planned. We thank the GMRT staff to schedule the
observations.
- GCN Circular #22223
A. Volnova (IKI), A. Moskvitin (SAO RAS), A. Pozanenko (IKI) report on
behalf of of larger GRB follow-up collaboration:
We observed the field of GRB 171205A (D'Elia et al., GCN 22177) with
Zeiss-1000 telescope of SAO-RAS Observatory starting on Dec. 09 (UT)
01:07:09. We took several images in R-filter. The afterglow of GRB
171205A (Izzo et al. GCN 22180; Emery et al. GCN 22181; Butler et al.
GCN 22182; Mao et al. GCN 22186; Choi et al. GCN 22188; Melandri et al.
GCN 22189; Steeghs et al. GCN 22190; Cobb et al. GCN 22192; Volnova et
al. GCN 22193; Guidorzi et al. GCN 22197; Schmidl et al. GCN 22198;
Lipunov et al. GCN 22199; Ugarte Postigo et al. GCN 22204) is clearly
detected. Preliminary photometry is following.
Date UT start t-T0 Filter Exp. OT Err. UL
(mid, days) (s)
2017-12-09 01:07:09 3.79078 R 22*300 18.60 0.04 22.5
The photometry is based on several nearby USNO-B1.0 stars previously
used in GCN 22193.
- GCN Circular #22224
A. Volnova (IKI), A. Pozanenko (IKI), E. Klunko (ISTP), E. Mazaeva
(IKI) report on behalf of of larger GRB follow-up collaboration:
We observed the field of GRB 171205A (D'Elia et al., GCN 22177) with
AZT-33IK telescope of Sayan observatory (Mondy). We took several images
in R-filter under non-optimal weathe conditions on Dec. 08 and fair
condiotns on Dec. 09. The afterglow of GRB 171205A (Izzo et al. GCN
22180; Emery et al. GCN 22181; Butler et al. GCN 22182; Mao et al. GCN
22186; Choi et al. GCN 22188; Melandri et al. GCN 22189; Steeghs et al.
GCN 22190; Cobb et al. GCN 22192; Volnova et al. GCN 22193; Guidorzi et
al. GCN 22197; Schmidl et al. GCN 22198; Lipunov et al. GCN 22199;
Ugarte Postigo et al. GCN 22204) is detected on Dec. 09. Preliminary
photometry is following.
Date UT start t-T0 Filter Exp. OT Err. UL
(mid, days) (s)
2017-12-08 21:18:28 3.59292 R 1200 n/d n/d 18.5
2017-12-09 20:44:55 4.57936 R 3300 18.4 0.1 21.7
The photometry is based on several nearby USNO-B1.0 stars previously
used in GCN 22193.
- GCN Circular #22225
Veli-Pekka Hentunen and Markku Nissinen (Taurus Hill Observatory,
Varkaus, Finland) report:
We have observed GRB 171205A field at iTelescope observatory (Siding
Spring, Australia) using T32 0.43-m f/6.8 astrograph. The optical counterpart
was detected at the position RA 11:09:39.6 and DEC -12:35:18.5.
The following magnitudes were obtained from the observations using
NOMAD1 0774-0294483 (V=15.610) as a comparison star:
Date Tmid(UT) Filter Exp. time Mag Mag.Err.
2017-12-09 17:00:25 unfiltered 10x120s 18.1 CV 0.5
2017-12-09 17:29:30 V 5x120s 17.4 0.6
- GCN Circular #22226
V. Lipunov, E. Gorbovskoy, V.Kornilov, N.Tyurina, D.Kuvshinov, A.V.Krylov,
I.Gorbunov, P.Balanutsa, A.Kuznetsov, V.V.Chazov, D. Vlasenko
Lomonosov Moscow State University, Sternberg Astronomical Institut of MSU
R.Podesta, C.Lopez, F. Podesta Observatorio Astronomico Felix Aguilar
(OAFA),
National University of San Juan, Argentina
H. Levato, C. Saffe
Instituto de Ciencias Astronomicas,de la Tierra y del Espacio (ICATE),
San Juan, Argentina
D.Buckley, S. Potter, A.Kniazev, M.Kotze
South African Astronomical Observatory
R. Rebolo, M. Serra, N. Lodieu, G. Israelian, L. Suarez-Andres
The Instituto de Astrofisica de Canarias
O.Gres, K.Ivanov, S.Yazev, N.M.Budnev, O.Gres, O.Chuvalaev, V.A.Poleshchuk,
Irkutsk State University
V.Yurkov, Yu.Sergienko
Blagoveschensk Educational State University, Blagoveschensk
A. Tlatov, V.Senik, A.V. Parhomenko, D. Dormidontov
Kislovodsk Solar Station of the Pulkovo Observatory
MASTER Global Robotic Net (http://observ.pereplet.ru) observes Swift GRB
171205A (D'Elia et al., GCN 22177) every night at
MASTER-Kislovodsk, MASTER-IAC, MASTER-SAAO .
The optical counterpart (Izzo et al. GCN 22180; Emery et al. GCN 22181;
Butler et al.GCN 22182; Mao et al. GCN 22186; Choi et al. GCN 22188;
Melandri et al.GCN 22189; Steeghs et al. GCN 22190; Cobb et al. GCN 22192;
Volnova et
al. GCN 22193; Guidorzi et al. GCN 22197; Schmidl et al. GCN 22198;
Lipunov et al. GCN 22199; Postigo et al. GCN 22204)
preliminary photometry of last nights is the following
Date UT Filter OT
2017-12-09 00:40:04.45 B 18.6+-0.2
2017-12-09 01:41:23.53 B 18.5+-0.2
2017-12-10 04:42:29.82 B 18.2+-0.2
2017-12-10 05:50:48.67 V 17.20+-0.20
2017-12-10 06:11:24.21 B 17.80+-0.24
2017-12-10 06:22:41.40 B 17.68+-0.16
2017-12-10 06:22:41.40 B 17.32+-0.19
This message can be cited.
- GCN Circular #22227
D. Frederiks, S. Golenetskii, R.Aptekar, P. Oleynik, M. Ulanov,
D. Svinkin, A. Tsvetkova, A.Lysenko, A. Kozlova, and T. Cline,
on behalf of the Konus-Wind team, report:
The long GRB 171205A (Swift-BAT trigger #794972: (D'Elia et al.,
GCN 22177; Barthelmy et al., GCN 22184; T0(BAT)=3D 07:20:43.893 UT)
was detected by Konus-Wind (KW) in the waiting mode.
A bayesian block analysis of the KW waiting mode data reveals a count
rate increase in the interval from ~T0(BAT)-50 s to ~T0(BAT)+95 s.
The detection significance in the combined G1+G2 light curve
(25-360 keV) is ~10 sigma (95 s scale) while no statistically
significant emission has been detected in the G3 band (360-1470 keV).
The KW light curve of this burst is available at
http://www.ioffe.rssi.ru/LEA/GRBs/GRB171205A/
The time-averaged 3-channel spectrum, measured from T0(BAT)-48.743 s
to T0(BAT)+42.521 s, is well fit by a simple power-law (PL) model
with the PL index 2.0 =B1 0.18, chi2 =3D 0.88 for 1 dof.
The burst fluence in the 20-1500 keV band is (7.8 =B1 1.6)x10^-6 erg/cm^2.
Assuming z = 0.0368 (Izzo et al., GCN 22180) 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 2.4x10^49 erg (20-1500 keV,
observer frame).
All the quoted errors are estimated at the 1 sigma confidence level.
All the presented results are preliminary.
- GCN Circular #22231
A. Y. Lien (GSFC/UMBC) reports on behalf of the BAT team:
In the Swift-BAT refined analysis of GRB 171205A (Barthelmy et al. GCN Circ. 22184),
we reported the incorrect Eiso for GRB 171205A due to a typo. The correct Eiso
(in the observed 15-150 keV band) should be 1.10e+49 erg.
We apologize for the error, and we thank Dmitry Frederiks for pointing this out.
- GCN Circular #22242
I.A. Smith (Rice U.) and N.R. Tanvir (U. of Leicester) report:
We are monitoring GRB 171205A (D'Elia et al., GCN Circ. 22177)
using the SCUBA-2 sub-millimeter continuum camera on the James
Clerk Maxwell Telescope. The source is well detected, as seen
at longer wavelengths by NOEMA (de Ugarte Postigo et al., GCN
Circ. 22187) and the VLA (Laskar et al., GCN Circ. 22216).
At 3.4 days after the burst trigger, the 850 micron flux density
was 30.3 +/- 2.4 mJy/beam.
We thank Mark Rawlings, William Montgomerie, Giovanni Rosotti,
Jim Hoge, and the JCMT staff for the prompt support of these
observations that are being taken under project S17BP006.
- GCN Circular #22252
D. A. Perley (LJMU), S. Schulze (Weizmann), and A. de Ugarte Postigo
(HETH/IAA-CSIC, DARK/NBI) report on behalf of a larger collaboration:
We observed the millimeter afterglow of GRB 171205A (D'Elia et al., GCN
22177; de Ugarte Postigo, GCN 22187) using the Atacama Large
Millimeter/Submillimeter Array (ALMA). Observations were taken using
the band 3 (92 GHz) and band 7 (340 GHz) receivers. The band 3
observations were carried out between 2017-12-11 09:40-10:01 UT (6.10
days after trigger) and the band 7 observations were carried out between
10:02-11:04 UT (6.13 days after trigger).
In a preliminary reduction, the afterglow is strongly detected (S/N >
100) in both channels. We estimate a flux density of 28 mJy at 92 GHz
and a flux of 16 mJy at 340 GHz, with calibration uncertainties of ~15%
and ~25%, respectively. We expect these uncertainties to improve
significantly after a full reduction. Further observations are planned.
We acknowledge the support of the ALMA staff in conducting these
observations rapidly, in particular Anita Richards, Andy Biggs, and
Eelco van Kampen.
- GCN Circular #22258
S.A. Trushkin, A.K. Erkenov, P.G. Tsybulev and N.A. Nizhelskij (SAO RAS)
report:
We have observed GRB 171205A (D'Elia et al.; GCN Circ. 22177) with
the RATAN-600 radio telescope at 4.7 and 8.2 GHz from December 9 to
December 16 2017 daily. We have detected a radio fluxes within the RA
errors of the source detected with VLA (Laskar et al.; GCN Circ. 22216).
The mean flux densities are equal 15 +- 2 and 19 +- 2 mJy at 4.7 and 8.2
GHz respectively. But we must notice that there is a known NVSS source
J110939.0-123330 (32 mJy at 1.4 GHz), also detected in the
GLEAM multi-frequency survey: J110938-123334 in the field of GRB 171205A
(J110939.5-123518).
We have probably detected contributions from both sources with the
RATAN arcmin-beams. Thus if we subtract the fluxes from the
NVSS source, using the power-law fitting of its spectrum
we can estimate the refined fluxes from GRB 171205A: < 3 mJy at 4.7 GHz
and 10 +- 3 mJy at 8.2 GHz for mean epoch: December 12 (MJD 58099.0),
i.e. ~7.3 days after the burst.
- GCN Circular #22264
Poonam Chandra (NCRA-TIFR, Stockholm University), A. J. Nayana
(NCRA-TIFR), Dipankar Bhattacharya (IUCAA), S. Bradley Cenko (NASA) and
Alessandra Corsi (Texas Tech University) report:
In our continuing follow up, we observed GRB 171205A (D'Elia et al., GCN
Circ. 22177) with the Giant Metrewave Radio Telescope (GMRT) on 2017 Dec
19.07 UT at 1400 MHz band. We detect radio emission at the GRB position
(Laskar et al. GCN 22216) with a flux density o 782+/-57 uJy. The map rms
is 33 uJy.
More observations are planned. We thank the GMRT staff to schedule the
observations.
- GCN Circular #22270
B. E. Cobb (GWU), reports:
Using the ANDICAM instrument on the 1.3m telescope at CTIO, we
obtained additional optical/IR imaging of the error region of
GRB 171205A (GCN 22177, D'Elia et al.). At each epoch,
total summed exposure times amounted to 15 min in V and I
and 12 min in J and K.
Between approximately 1 and 2 days post-burst, the optical/IR
afterglow of GRB 171205A (GCN 22180, Izzo et al.;
GCN 22181, Emery et al.; GCN 22182, Butler et al.;
GCN 22186, Mao et al.; GCN 22188, Choi et al.;
GCN 22189, Melandri et al.; GCN 22190, Steeghs et al.;
GCN 22192, Cobb; GCN 22193, Volnova et al.;
GCN 22195, Mao et al.; GCN 22197, Guidorzi et al.;
GCN 22198, Schmidl & Schady; GCN 22199, Lipunov et al.;
GCN 22202, Siegel et al.; GCN 22205, Volnova et al.;
GCN 22215, Laskar et al.; GCN 22223, Volnova et al.;
GCN 22224, Volnova et al.; GCN 22225, Hentunen & Nissinen;
GCN 22226, Lipunov et al.) is clearly seen to dim. After about 6 days
post-burst, however, a brightening is detected. This brightening is
due to the emergence of the underlying supernova associated with
GRB 171205A, and is consistent with the spectroscopic
detection of this supernova by de Ugarte Postigo et al. (GCN 22204).
Approximate I-band and J-band magnitudes are given below.
days
post-burst I mag J mag
1.02056 17.7 17.6
2.03260 18.1 17.9
4.03747 18.2 18.0
6.01435 18.1 17.6
10.98015 17.7 17.5
17.01212 17.6 17.0
(Optical photometry is calibrated against Landolt standard stars;
and IR photometry is calibrated against 2MASS stars in the
field. The magnitudes include afterglow and host galaxy contributions
and should be considered only highly preliminary values.)
- GCN Circular #22302
Miguel Perez-Torres (IAA-CSIC), S. Bradley Cenko (NASA), Assaf Horesh
(HUJI),
and Antxon Alberdi (IAA-CSIC) report:
We observed GRB 171205A (D'Elia et al., GCN 22177) with the Very Long
Baseline Array (VLBA) on 2017 Dec 15.53 UT and 2017 Dec 16.56 at several
frequencies. We centered our observations at the VLA position of GRB
171205A
(Laskar et al., GCN 22216), and imaged a region of (0.5x0.5) sq. arcsec
around it.
At a frequency of 4.4 GHz, we detect GRB 171205A with a preliminary peak
flux
density of ~2.3 mJy/beam at the following position:
RA = 11:09:39.5179609
Dec = -12:35:18.459250
The (preliminary) uncertainty on the position of the peak flux density
is of
~130 and ~50 microarcsec in RA and Dec, respectively.
More VLBI follow-up observations of GRB171205A are on the way.
We thank the NRAO staff for the time allocation and their help with the
observations.
- GCN Circular #22350
Miguel Perez-Torres (IAA-CSIC), J. Moldon (JBCA), E. Varenius (JBCA), R. Beswick
(JBCA), Antxon Alberdi (IAA-CSIC), S. Bradley Cenko (NASA), and Assaf Horesh
(HUJI) report:
We observed GRB 171205A (D'Elia et al., GCN 22177) with the electronic
Multi-Element Radio Linked Interferometer Network (eMERLIN) on 2017 Dec 20 (from
20.06 UT until 20.35 UT) and on 2017 Dec 21 (from 21.06 UT until 21.31 UT), for
a total of 12.7 hr.
The observations were carried out with a five-array telescope (Mk2, Pi, Da, De,
Cm) at a central frequency of 5.1 GHz, with a bandwidth of 512 MHz. The
synthesized beam was of 0.22x0.030 sq. arcsec at a position angle of 17.7 deg.
We clearly detected GRB 171205A with a peak flux density of 7.9 mJy/beam. The
off-source rms was of 0.05 mJy/b, and the calibration uncertainty is about 5%,
for a total uncertainty in the GRB flux density of 0.4 mJy.
We thank the e-MERLIN staff for the time allocation and their help with the
observations.
- GCN Circular #27812
James Leung (University of Sydney/CSIRO), Tara Murphy (University of
Sydney), Emil Lenc (CSIRO), Dougal Dobie (University of Sydney/CSIRO),
David Kaplan (UWM)
We have performed two observations for GRB 171205A (V. D’Elia et al., GCN
Circ. 22177) centred on the optical afterglow position (L. Izzo et al.,
GCN Circ. 22180) with the Australia Telescope Compact Array (ATCA). The
observations took place on 2020 April 12 (859 days post-burst) and 2020
May 7 (884 days post-burst) at several frequencies. We report the
detections and 3-sigma limits below:
Date (UTC) | Freq (GHz) | Peak Flux Density (micro-Jy/beam)
-----------------------------------------------------------
2020/04/12 | 2.1 | 708 +/- 253
2020/04/12 | 5.5 | 412 +/- 47
2020/04/12 | 9.0 | 252 +/- 27
2020/04/12 | 16.7 | 112 +/- 38
2020/04/12 | 21.2 | < 87
2020/05/07 | 2.1 | 816 +/- 287
2020/05/07 | 5.5 | 440 +/- 52
2020/05/07 | 9.0 | 237 +/- 26
2020/05/07 | 16.7 | 133 +/- 50
2020/05/07 | 21.2 | < 122
We thank CSIRO staff for supporting these observations during these
especially difficult times.
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