Gamma-ray Burst 211207A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

none

Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 07 Dec 21 20:53:11 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     1088376,   Seg_Num: 0
GRB_RA:          149.625d {+09h 58m 30s} (J2000),
                 149.878d {+09h 59m 31s} (current),
                 149.049d {+09h 56m 12s} (1950)
GRB_DEC:         -24.352d {-24d 21' 05"} (J2000),
                 -24.457d {-24d 27' 25"} (current),
                 -24.112d {-24d 06' 43"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       3094 [cnts]    Image_Peak=150 [image_cnts]
TRIGGER_DUR:     1.024 [sec] 
TRIGGER_INDEX:   149     E_range: 25-100 keV
BKG_INTEN:       19382 [cnts]
BKG_TIME:        75163.78 SOD {20:52:43.78} UT
BKG_DUR:         8 [sec]
GRB_DATE:        19555 TJD;   341 DOY;   21/12/07
GRB_TIME:        75176.77 SOD {20:52:56.77} UT
GRB_PHI:           8.93 [deg]
GRB_THETA:        32.98 [deg]
SOLN_STATUS:     0x3
RATE_SIGNIF:     11.44 [sigma]
IMAGE_SIGNIF:    7.77 [sigma]
MERIT_PARAMS:     +1  +0  +0  +0  +2  -2  +0  +0  +5  +0 
SUN_POSTN:       254.77d {+16h 59m 06s}  -22.70d {-22d 41' 51"}
SUN_DIST:         93.22 [deg]   Sun_angle= 7.0 [hr] (West of Sun)
MOON_POSTN:      308.92d {+20h 35m 40s}  -23.45d {-23d 26' 46"}
MOON_DIST:       127.96 [deg]
MOON_ILLUM:      18 [%]
GAL_COORDS:      259.95, 23.75 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      161.79,-34.16 [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 = 98.77,-20.39 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 07 Dec 21 20:54:24 UT
NOTICE_TYPE:     Swift-XRT Nack-Position
TRIGGER_NUM:     1088376,   Seg_Num: 0
POINT_RA:        149.639d {+09h 58m 33s} (J2000)
POINT_DEC:       -24.356d {-24d 21' 21"} (J2000)
IMG_START_DATE:  19555 TJD;   341 DOY;   21/12/07
IMG_START_TIME:  75257.29 SOD {20:54:17.29} UT,   80.5 [sec] since BAT Trigger Time
COUNTS:          5    Min_needed= 20
STD_DEV:         0.00   Max_StdDev_for_Good=28.44 [arcsec]
PH2_ITER:        2    Max_iter_allowed= 4
ERROR_CODE:      1
COMMENTS:        SWIFT-XRT Nack Position.  
COMMENTS:        No source found in the image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 07 Dec 21 20:57:20 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     1088376,   Seg_Num: 0
GRB_RA:          149.625d {+09h 58m 30s} (J2000),
                 149.878d {+09h 59m 31s} (current),
                 149.049d {+09h 56m 12s} (1950)
GRB_DEC:         -24.352d {-24d 21' 05"} (J2000),
                 -24.457d {-24d 27' 25"} (current),
                 -24.112d {-24d 06' 43"} (1950)
GRB_DATE:        19555 TJD;   341 DOY;   21/12/07
GRB_TIME:        75176.77 SOD {20:52:56.77} UT
TRIGGER_INDEX:   149
GRB_PHI:           8.93 [deg]
GRB_THETA:        32.98 [deg]
DELTA_TIME:      -18.00 [sec]
TRIGGER_DUR:     1.024 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     11.44 [sigma]
IMAGE_SIGNIF:    7.77 [sigma]
LC_URL:          sw01088376000msb.lc
SUN_POSTN:       254.78d {+16h 59m 07s}  -22.70d {-22d 41' 52"}
SUN_DIST:         93.22 [deg]   Sun_angle= 7.0 [hr] (West of Sun)
MOON_POSTN:      308.96d {+20h 35m 51s}  -23.44d {-23d 26' 15"}
MOON_DIST:       127.99 [deg]
MOON_ILLUM:      18 [%]
GAL_COORDS:      259.95, 23.75 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      161.79,-34.16 [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 = 98.77,-20.39 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 07 Dec 21 20:57:55 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     1088376,   Seg_Num: 0
POINT_RA:        149.639d {+09h 58m 33s} (J2000)
POINT_DEC:       -24.356d {-24d 21' 22"} (J2000)
POINT_ROLL:      116.833d
IMG_START_DATE:  19555 TJD;   341 DOY;   21/12/07
IMG_START_TIME:  75260.79 SOD {20:54:20.79} UT,   84.0 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.141
N_STARS:         190
X_OFFSET:        408 [pixels]
Y_OFFSET:        625 [pixels]
X_MAX:           1367 [pixels]
Y_MAX:           1584 [pixels]
DET_THRESH:      12
PHOTO_THRESH:    6
SL_URL:          sw01088376000msufc0084.fits
SUN_POSTN:       254.78d {+16h 59m 07s}  -22.70d {-22d 41' 52"}
SUN_DIST:         93.21 [deg]   Sun_angle= 7.0 [hr] (West of Sun)
MOON_POSTN:      308.97d {+20h 35m 53s}  -23.44d {-23d 26' 11"}
MOON_DIST:       127.98 [deg]
MOON_ILLUM:      18 [%]
GAL_COORDS:      259.96, 23.75 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      161.80,-34.16 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 07 Dec 21 20:58:13 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     1088376,   Seg_Num: 0
POINT_RA:        149.639d {+09h 58m 33s} (J2000)
POINT_DEC:       -24.356d {-24d 21' 22"} (J2000)
POINT_ROLL:      116.833d
IMG_START_DATE:  19555 TJD;   341 DOY;   21/12/07
IMG_START_TIME:  75260.79 SOD {20:54:20.79} UT,   84.0 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.141
N_STARS:         190
X_OFFSET:        408 [pixels]
Y_OFFSET:        625 [pixels]
X_MAX:           1367 [pixels]
Y_MAX:           1584 [pixels]
DET_THRESH:      12
PHOTO_THRESH:    6
SL_URL:          sw01088376000msufc0084.fits
SUN_POSTN:       254.78d {+16h 59m 07s}  -22.70d {-22d 41' 52"}
SUN_DIST:         93.21 [deg]   Sun_angle= 7.0 [hr] (West of Sun)
MOON_POSTN:      308.97d {+20h 35m 53s}  -23.44d {-23d 26' 08"}
MOON_DIST:       127.98 [deg]
MOON_ILLUM:      18 [%]
GAL_COORDS:      259.96, 23.75 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      161.80,-34.16 [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 07 Dec 21 20:59:33 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     1088376,   Seg_Num: 0
POINT_RA:        149.639d {+09h 58m 33s} (J2000)
POINT_DEC:       -24.356d {-24d 21' 22"} (J2000)
ROLL:            116.833d
IMG_START_DATE:  19555 TJD;   341 DOY;   21/12/07
IMG_START_TIME:  75260.79 SOD {20:54:20.79} UT,   84.0 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     660603289
X_OFFSET:        727 [pixels]
Y_OFFSET:        944 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       887
Y_GRB_POS:       1104
BINNING_INDEX:   1
IM_URL:          sw01088376000msuni0113.fits
SUN_POSTN:       254.78d {+16h 59m 07s}  -22.70d {-22d 41' 52"}
SUN_DIST:         93.21 [deg]   Sun_angle= 7.0 [hr] (West of Sun)
MOON_POSTN:      308.99d {+20h 35m 57s}  -23.43d {-23d 25' 58"}
MOON_DIST:       127.99 [deg]
MOON_ILLUM:      18 [%]
GAL_COORDS:      259.96, 23.75 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      161.80,-34.16 [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:     Tue 07 Dec 21 20:58:44 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     1088376,   Seg_Num: 0
GRB_RA:          149.6245d {+09h 58m 29.88s} (J2000),
                 149.8776d {+09h 59m 30.62s} (current),
                 149.0479d {+09h 56m 11.49s} (1950)
GRB_DEC:         -24.3598d {-24d 21' 35.2"} (J2000),
                 -24.4653d {-24d 27' 55.0"} (current),
                 -24.1203d {-24d 07' 13.1"} (1950)
GRB_ERROR:       3.8 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  19555 TJD;   341 DOY;   21/12/07
IMG_START_TIME:  75264.00 SOD {20:54:24.00} UT,   87.2 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       254.78d {+16h 59m 07s}  -22.70d {-22d 41' 52"}
SUN_DIST:         93.22 [deg]   Sun_angle= 7.0 [hr] (West of Sun)
MOON_POSTN:      308.98d {+20h 35m 55s}  -23.43d {-23d 26' 04"}
MOON_DIST:       127.99 [deg]
MOON_ILLUM:      18 [%]
GAL_COORDS:      259.96, 23.74 [deg] galactic lon,lat of the burst
ECL_COORDS:      161.79,-34.17 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
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:        The probability that this is a serendipitous source in the  
COMMENTS:        SPER window is 0.58% < P(seren) < 1.1%.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 07 Dec 21 20:59:40 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     1088376,   Seg_Num: 0
POINT_RA:        149.639d {+09h 58m 33s} (J2000)
POINT_DEC:       -24.356d {-24d 21' 22"} (J2000)
ROLL:            116.833d
IMG_START_DATE:  19555 TJD;   341 DOY;   21/12/07
IMG_START_TIME:  75260.79 SOD {20:54:20.79} UT,   84.0 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     660603289
X_OFFSET:        727 [pixels]
Y_OFFSET:        944 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       887
Y_GRB_POS:       1104
BINNING_INDEX:   1
IM_URL:          sw01088376000msuni0113.fits
SUN_POSTN:       254.78d {+16h 59m 07s}  -22.70d {-22d 41' 52"}
SUN_DIST:         93.21 [deg]   Sun_angle= 7.0 [hr] (West of Sun)
MOON_POSTN:      308.99d {+20h 35m 57s}  -23.43d {-23d 25' 57"}
MOON_DIST:       127.99 [deg]
MOON_ILLUM:      18 [%]
GAL_COORDS:      259.96, 23.75 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      161.80,-34.16 [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 NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 07 Dec 21 21:00:23 UT
NOTICE_TYPE:     Swift-UVOT Position
TRIGGER_NUM:     1088376,   Seg_Num: 0
GRB_RA:          149.6240d {+09h 58m 29.75s} (J2000),
                 149.8771d {+09h 59m 30.50s} (current),
                 149.0474d {+09h 56m 11.37s} (1950)
GRB_DEC:         -24.3586d {-24d 21' 30.9"} (J2000),
                 -24.4641d {-24d 27' 50.7"} (current),
                 -24.1191d {-24d 07' 08.8"} (1950)
GRB_ERROR:       0.6 [arcsec radius, statistical only]
GRB_MAG:         17.45 +/- 0.14 [mag]
FILTER:          10, White
IMG_START_DATE:  19555 TJD;   341 DOY;   21/12/07
IMG_START_TIME:  75257.00 SOD {20:54:17.00} UT,   80.2 [sec] since BAT Trigger Time
SUN_POSTN:       254.78d {+16h 59m 07s}  -22.70d {-22d 41' 53"}
SUN_DIST:         93.22 [deg]   Sun_angle= 7.0 [hr] (West of Sun)
MOON_POSTN:      309.00d {+20h 35m 59s}  -23.43d {-23d 25' 52"}
MOON_DIST:       128.00 [deg]
MOON_ILLUM:      18 [%]
GAL_COORDS:      259.95, 23.74 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      161.79,-34.17 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT UVOT Position Notice.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        Result based on Genie data.  
COMMENTS:        Notice generated automatically.

GCN Circular #31182
E. Ambrosi (INAF-IASFPA), V. D'Elia (SSDC & INAF-OAR), S. Dichiara (PSU), J.D. Gropp (PSU), J. A. Kennea (PSU), S. Laha (GSFC/UMBC), A. Y. Lien (U Tampa), F. E. Marshall (NASA/GSFC), K. L. Page (U Leicester), T. M. Parsotan (GSFC/UMBC/CRESSTII) and B. Sbarufatti (PSU) report on behalf of the Neil Gehrels Swift Observatory Team:
At 20:52:56 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 211207A (trigger=1088376). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 149.625, -24.352 which is
```
   RA(J2000) = 09h 58m 30s
   Dec(J2000) = -24d 21' 05"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a complex structure with a duration of about 4 sec. The peak count rate was ~1500 counts/sec (15-350 keV), at ~0 sec after the trigger.
The XRT began observing the field at 20:54:17.2 UT, 80.5 seconds after the BAT trigger. Using promptly downlinked data we find an uncatalogued X-ray source located at RA, Dec 149.62449, -24.35970 which is equivalent to:
```
   RA(J2000)  = 09h 58m 29.88s
   Dec(J2000) = -24d 21' 34.9"
```
with an uncertainty of 3.7 arcseconds (radius, 90% containment). This location is 27 arcseconds from the BAT onboard position, within the BAT error circle. This position may be improved as more data are received; the latest position is available at https://www.swift.ac.uk/sper. We cannot determine whether the source is fading at the present time.
A power-law fit to a spectrum formed from promptly downlinked event data gives a column density in excess of the Galactic value (4.94 x 10^20 cm^-2, Willingale et al. 2013), with an excess column of 3.1 (+3.50/-2.89) x 10^21 cm^-2 (90% confidence).
UVOT took a finding chart exposure of 150 seconds with the White filter starting 84 seconds after the BAT trigger. There is a candidate afterglow in the rapidly available 2.7'x2.7' sub-image at
```
  RA(J2000)  =	09:58:29.78 = 149.62408
  DEC(J2000) = -24:21:31.1  = -24.35863
```
with a 90%-confidence error radius of about 0.62 arc sec. This position is 3.5 arc sec. from the center of the XRT error circle. The estimated magnitude is 17.45 with a 1-sigma error of about 0.14. No correction has been made for the expected extinction corresponding to E(B-V) of 0.050.
Burst Advocate for this burst is E. Ambrosi (elena.ambrosi AT 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/)

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 07 Dec 21 21:07:05 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     1088376,   Seg_Num: 0
POINT_RA:        149.640d {+09h 58m 34s} (J2000)
POINT_DEC:       -24.354d {-24d 21' 14"} (J2000)
POINT_ROLL:      116.831d
IMG_START_DATE:  19555 TJD;   341 DOY;   21/12/07
IMG_START_TIME:  75472.83 SOD {20:57:52.83} UT,   296.1 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.669
N_STARS:         190
X_OFFSET:        168 [pixels]
Y_OFFSET:        385 [pixels]
X_MAX:           1607 [pixels]
Y_MAX:           1824 [pixels]
DET_THRESH:      7
PHOTO_THRESH:    3
SL_URL:          sw01088376000msufc0296.fits
SUN_POSTN:       254.78d {+16h 59m 08s}  -22.70d {-22d 41' 54"}
SUN_DIST:         93.21 [deg]   Sun_angle= 7.0 [hr] (West of Sun)
MOON_POSTN:      309.07d {+20h 36m 16s}  -23.42d {-23d 25' 01"}
MOON_DIST:       128.04 [deg]
MOON_ILLUM:      18 [%]
GAL_COORDS:      259.96, 23.75 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      161.80,-34.16 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 07 Dec 21 21:07:24 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     1088376,   Seg_Num: 0
POINT_RA:        149.640d {+09h 58m 34s} (J2000)
POINT_DEC:       -24.354d {-24d 21' 14"} (J2000)
POINT_ROLL:      116.831d
IMG_START_DATE:  19555 TJD;   341 DOY;   21/12/07
IMG_START_TIME:  75472.83 SOD {20:57:52.83} UT,   296.1 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.669
N_STARS:         190
X_OFFSET:        168 [pixels]
Y_OFFSET:        385 [pixels]
X_MAX:           1607 [pixels]
Y_MAX:           1824 [pixels]
DET_THRESH:      7
PHOTO_THRESH:    3
SL_URL:          sw01088376000msufc0296.fits
SUN_POSTN:       254.79d {+16h 59m 08s}  -22.70d {-22d 41' 54"}
SUN_DIST:         93.21 [deg]   Sun_angle= 7.0 [hr] (West of Sun)
MOON_POSTN:      309.07d {+20h 36m 17s}  -23.42d {-23d 24' 59"}
MOON_DIST:       128.04 [deg]
MOON_ILLUM:      18 [%]
GAL_COORDS:      259.96, 23.75 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      161.80,-34.16 [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 07 Dec 21 21:08:39 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     1088376,   Seg_Num: 0
POINT_RA:        149.640d {+09h 58m 34s} (J2000)
POINT_DEC:       -24.354d {-24d 21' 14"} (J2000)
ROLL:            116.831d
IMG_START_DATE:  19555 TJD;   341 DOY;   21/12/07
IMG_START_TIME:  75472.83 SOD {20:57:52.83} UT,   296.1 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     660603501
X_OFFSET:        727 [pixels]
Y_OFFSET:        944 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       887
Y_GRB_POS:       1104
BINNING_INDEX:   1
IM_URL:          sw01088376000msuni0325.fits
SUN_POSTN:       254.79d {+16h 59m 09s}  -22.70d {-22d 41' 55"}
SUN_DIST:         93.21 [deg]   Sun_angle= 7.0 [hr] (West of Sun)
MOON_POSTN:      309.08d {+20h 36m 20s}  -23.41d {-23d 24' 49"}
MOON_DIST:       128.04 [deg]
MOON_ILLUM:      18 [%]
GAL_COORDS:      259.96, 23.75 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      161.80,-34.16 [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:     Tue 07 Dec 21 21:08:52 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     1088376,   Seg_Num: 0
POINT_RA:        149.640d {+09h 58m 34s} (J2000)
POINT_DEC:       -24.354d {-24d 21' 14"} (J2000)
ROLL:            116.831d
IMG_START_DATE:  19555 TJD;   341 DOY;   21/12/07
IMG_START_TIME:  75472.83 SOD {20:57:52.83} UT,   296.1 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     660603501
X_OFFSET:        727 [pixels]
Y_OFFSET:        944 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       887
Y_GRB_POS:       1104
BINNING_INDEX:   1
IM_URL:          sw01088376000msuni0325.fits
SUN_POSTN:       254.79d {+16h 59m 09s}  -22.70d {-22d 41' 55"}
SUN_DIST:         93.21 [deg]   Sun_angle= 7.0 [hr] (West of Sun)
MOON_POSTN:      309.09d {+20h 36m 21s}  -23.41d {-23d 24' 48"}
MOON_DIST:       128.05 [deg]
MOON_ILLUM:      18 [%]
GAL_COORDS:      259.96, 23.75 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      161.80,-34.16 [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 NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 07 Dec 21 21:15:13 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     1088376,   Seg_Num: 0
POINT_RA:        149.640d {+09h 58m 34s} (J2000)
POINT_DEC:       -24.354d {-24d 21' 14"} (J2000)
POINT_ROLL:      116.832d
IMG_START_DATE:  19555 TJD;   341 DOY;   21/12/07
IMG_START_TIME:  76052.15 SOD {21:07:32.15} UT,   875.4 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.755
N_STARS:         190
X_OFFSET:        168 [pixels]
Y_OFFSET:        385 [pixels]
X_MAX:           1607 [pixels]
Y_MAX:           1824 [pixels]
DET_THRESH:      14
PHOTO_THRESH:    7
SL_URL:          sw01088376000msufc0875.fits
SUN_POSTN:       254.79d {+16h 59m 10s}  -22.70d {-22d 41' 57"}
SUN_DIST:         93.22 [deg]   Sun_angle= 7.0 [hr] (West of Sun)
MOON_POSTN:      309.15d {+20h 36m 37s}  -23.40d {-23d 24' 00"}
MOON_DIST:       128.08 [deg]
MOON_ILLUM:      18 [%]
GAL_COORDS:      259.96, 23.75 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      161.80,-34.16 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 07 Dec 21 21:15:33 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     1088376,   Seg_Num: 0
POINT_RA:        149.640d {+09h 58m 34s} (J2000)
POINT_DEC:       -24.354d {-24d 21' 14"} (J2000)
POINT_ROLL:      116.832d
IMG_START_DATE:  19555 TJD;   341 DOY;   21/12/07
IMG_START_TIME:  76052.15 SOD {21:07:32.15} UT,   875.4 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.755
N_STARS:         190
X_OFFSET:        168 [pixels]
Y_OFFSET:        385 [pixels]
X_MAX:           1607 [pixels]
Y_MAX:           1824 [pixels]
DET_THRESH:      14
PHOTO_THRESH:    7
SL_URL:          sw01088376000msufc0875.fits
SUN_POSTN:       254.79d {+16h 59m 10s}  -22.70d {-22d 41' 57"}
SUN_DIST:         93.22 [deg]   Sun_angle= 7.0 [hr] (West of Sun)
MOON_POSTN:      309.16d {+20h 36m 38s}  -23.40d {-23d 23' 57"}
MOON_DIST:       128.09 [deg]
MOON_ILLUM:      18 [%]
GAL_COORDS:      259.96, 23.75 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      161.80,-34.16 [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 07 Dec 21 21:17:08 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     1088376,   Seg_Num: 0
POINT_RA:        149.640d {+09h 58m 34s} (J2000)
POINT_DEC:       -24.354d {-24d 21' 14"} (J2000)
ROLL:            116.832d
IMG_START_DATE:  19555 TJD;   341 DOY;   21/12/07
IMG_START_TIME:  76052.15 SOD {21:07:32.15} UT,   875.4 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     660604080
X_OFFSET:        727 [pixels]
Y_OFFSET:        944 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       887
Y_GRB_POS:       1104
BINNING_INDEX:   1
IM_URL:          sw01088376000msuni0904.fits
SUN_POSTN:       254.79d {+16h 59m 10s}  -22.70d {-22d 41' 57"}
SUN_DIST:         93.22 [deg]   Sun_angle= 7.0 [hr] (West of Sun)
MOON_POSTN:      309.17d {+20h 36m 42s}  -23.40d {-23d 23' 45"}
MOON_DIST:       128.10 [deg]
MOON_ILLUM:      18 [%]
GAL_COORDS:      259.96, 23.75 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      161.80,-34.16 [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:     Tue 07 Dec 21 21:17:15 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     1088376,   Seg_Num: 0
POINT_RA:        149.640d {+09h 58m 34s} (J2000)
POINT_DEC:       -24.354d {-24d 21' 14"} (J2000)
ROLL:            116.832d
IMG_START_DATE:  19555 TJD;   341 DOY;   21/12/07
IMG_START_TIME:  76052.15 SOD {21:07:32.15} UT,   875.4 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     660604080
X_OFFSET:        727 [pixels]
Y_OFFSET:        944 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       887
Y_GRB_POS:       1104
BINNING_INDEX:   1
IM_URL:          sw01088376000msuni0904.fits
SUN_POSTN:       254.79d {+16h 59m 10s}  -22.70d {-22d 41' 57"}
SUN_DIST:         93.22 [deg]   Sun_angle= 7.0 [hr] (West of Sun)
MOON_POSTN:      309.18d {+20h 36m 42s}  -23.40d {-23d 23' 44"}
MOON_DIST:       128.10 [deg]
MOON_ILLUM:      18 [%]
GAL_COORDS:      259.96, 23.75 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      161.80,-34.16 [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 #31183
V. Lipunov, V.Kornilov, E.Gorbovskoy, K.Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, D. Vlasenko, G.Antipov, D.Zimnukhov, V.Senik, T.Pogrosheva, E.Minkina, A.Chasovnikov, V.Topolev, V.Grinshpun, D.Kuvshinov, D. Cheryasov (Lomonosov Moscow State University, SAI, Physics Department),
R. Podesta, C.Lopez, F. Podesta, C.Francile (Observatorio Astronomico Felix Aguilar OAFA),
R. Rebolo, M. Serra (The Instituto de Astrofisica de Canarias),
D. Buckley (South African Astronomical Observatory),
O.A. Gres, N.M. Budnev (Irkutsk State University, API),
A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory),
A. Gabovich, V.Yurkov (Blagoveschensk Educational State University)
MASTER-Kislovodsk robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) was pointed to the Swift GRB 211207A ( E. Ambrosi et al., GCN 31182) errorbox 4112 sec after notice time and 4128 sec after trigger time at 2021-12-07 22:01:45 UT, with upper limit up to 15.3 mag. The observations began at zenith distance = 87 deg. The sun altitude is -66.2 deg.
The galactic latitude b = 24 deg., longitude l = 261 deg.
Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=1807266
We obtain a following upper limits.
```
Tmid-T0  |          Site       |Filt.| Expt. | Limit| Comment
_________|_____________________|_____|_______|______|________

    4219 |   MASTER-Kislovodsk |   C |   180 | 14.6 |        
    4219 |   MASTER-Kislovodsk |   C |   180 | 14.3 |        
    4419 |   MASTER-Kislovodsk |   C |   180 | 14.5 |        
    4419 |   MASTER-Kislovodsk |   C |   180 | 14.2 |        
    4619 |   MASTER-Kislovodsk |   C |   180 | 14.8 |        
    4619 |   MASTER-Kislovodsk |   C |   180 | 14.4 |        
    4819 |   MASTER-Kislovodsk |   C |   180 | 15.3 |        
    4819 |   MASTER-Kislovodsk |   C |   180 | 14.7 |        
```
Filter C is a clear (unfiltred) band.
The observation and reduction will continue. The message may be cited.
GCN Circular #31184
J.P. Osborne, A.P. Beardmore, P.A. Evans and M.R. Goad (U. Leicester) report on behalf of the Swift-XRT team.
Using 1514 s of XRT Photon Counting mode data and 1 UVOT images for GRB 211207A, 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 = 149.62381, -24.35968 which is equivalent to:
```
RA (J2000): 09h 58m 29.71s
Dec (J2000): -24d 21' 34.8"
```
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 #31185
P.A. Evans (U. Leicester), J.P. Osborne (U. Leicester), K.L. Page (U. Leicester), M.G. Bernardini (INAF-OAB), M. Capalbi (INAF-IASFPA), B. Sbarufatti (PSU), D.N. Burrows (PSU), J. D. Gropp (PSU) and E. Ambrosi report on behalf of the Swift-XRT team:
We have analysed 6.3 ks of XRT data for GRB 211207A (Ambrosi et al. GCN Circ. 31182), from 87 s to 39.7 ks after the BAT trigger. The data are entirely in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Osborne et al. (GCN Circ. 31184).
The light curve can be modelled with a power-law decay with a decay index of alpha=0.92 (+0.08, -0.07).
A spectrum formed from the PC mode data can be fitted with an absorbed power-law with a photon spectral index of 2.08 (+0.29, -0.27). The best-fitting absorption column is 1.7 (+0.9, -0.8) x 10^21 cm^-2, in excess of the Galactic value of 4.9 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 3.3 x 10^-11 (4.6 x 10^-11) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
```
Total column:	     1.7 (+0.9, -0.8) x 10^21 cm^-2
Galactic foreground: 4.9 x 10^20 cm^-2
Excess significance: 2.7 sigma
Photon index:	     2.08 (+0.29, -0.27)
```
If the light curve continues to decay with a power-law decay index of 0.92, the count rate at T+24 hours will be 1.9 x 10^-3 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 6.3 x 10^-14 (8.7 x 10^-14) erg cm^-2 s^-1.
The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/01088376.
This circular is an official product of the Swift-XRT team.
GCN Circular #31188
B. Schneider (CEA Paris-Saclay), L. Izzo (DARK/NBI), D. B. Malesani (Univ. Radboud and DAWN/NBI), J. P. U. Fynbo (DAWN/NBI), K. Wiersema (Univ. Lancaster), V. D’Elia (ASI/SSDC, INAF/OAR), K. E. Heintz (Univ. Iceland and DAWN/NBI), report on behalf of the Stargate collaboration:
We observed the afterglow of GRB 211207A (Ambrosi et al., GCN 31182) using the ESO VLT UT3 (Melipal) equipped with the X-shooter spectrograph. Our spectra cover the wavelength range 3000-21000 AA, and consist of 4 exposures of 1200 s each. The observation mid time was 2021 Dec 8.288 UT (10.04 hr after the GRB).
In a 60 s image taken with the acquisition camera on Dec 8.249 UT, we detect the optical afterglow, for which we measure an AB magnitude r = 22.16 +/- 0.05 mag (calibrated against two nearby stars from the Pan-STARRS catalog).
We clearly detect continuum over the wavelength range 3400 - 18000 AA. A trough is visible around 3960 AA, which we identify as due to H I. From detection of multiple absorption features, which we interpret as due to Si II, O I, C II, Fe II, Si IV, C IV, Al II, Mg II, we infer a redshift z = 2.272. An emission line is also detected at 16390 AA, which we interpret as due to [O III] from the GRB host galaxy.
We acknowledge excellent support from the ESO observing staff in Paranal, in particular Joe Anderson, Zahed Wahhaj and Rob van Holstein.
GCN Circular #31189
T. Sakamoto (AGU), S. D. Barthelmy (GSFC),
H. A. Krimm (NSF), S. Laha (GSFC/UMBC),
A. Y. Lien (U Tampa), C. B. Markwardt (GSFC),
D. M. Palmer (LANL), T. Parsotan (GSFC/UMBC),
M. Stamatikos (OSU), (i.e. the Swift-BAT team):
Using the data set from T-240 to T+962 sec from the recent telemetry downlink, we report further analysis of BAT GRB 211207A (trigger #1088376) (Ambrosi et al., GCN 31182). The BAT ground-calculated position is RA, Dec = 149.601, -24.360 deg which is
```
   RA(J2000)  =  09h 58m 24.1s
   Dec(J2000) = -24d 21' 37.3"
```
with an uncertainty of 2.3 arcmin, (radius, sys+stat, 90% containment). The partial coding was 62%.
The BAT light curve showed a complex structure with a duration of about 4 sec. T90 (15-350 keV) is 3.73 +- 0.87 sec (estimated error including systematics).
The time-averaged spectrum from T-1.30 to T+2.97 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.72 +- 0.30. The fluence in the 15-150 keV band is 1.9 +- 0.4 x 10^-07 erg/cm2. The 1-sec peak photon flux measured from T-0.15 sec in the 15-150 keV band is 0.9 +- 0.2 ph/cm2/sec. All the quoted errors are at the 90% confidence level.
The results of the batgrbproduct analysis are available at http://gcn.gsfc.nasa.gov/notices_s/1088376/BA/
GCN Circular #31204
M. H. Siegel (PSU) and Ambrosi (INAF-IASFPA) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 211207A 85 s after the BAT trigger (Ambrosi et al., GCN Circ. 31182). A source consistent with the XRT position (Osborne et al. GCN Circ. 31184) is detected in the initial UVOT exposures.
The preliminary UVOT position is:
```
    RA  (J2000) =  09:58:29.79 = 149.62412 (deg.)
    Dec (J2000) = -24:21:31.3  = -24.35869 (deg.)
```
with an estimated uncertainty of 0.43 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               85          234          147         17.52 +/- 0.04
v                  627         1595          117        >18.5
b                  553          743           36         19.08 +/- 0.31
u                  297          546          246         18.15 +/- 0.09
w1                 677         1470           97        >18.7
m2                 652         1272           39        >18.7
w2                 776         1570           78        >19.0
```
The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.050 in the direction of the burst (Schlegel et al. 1998).
GCN Circular #31290
C. Fletcher (USRA) reports on behalf of the Fermi-GBM Team:
Swift-BAT detected GRB 211207A at 20:52:56 UT (GCN 31182). There was no Fermi-GBM onboard trigger around the event.
An automated, blind search for short gamma-ray bursts below the onboard triggering threshold in Fermi-GBM identified no counterparts.
The GBM targeted search [1], the most sensitive, coherent search for GRB-like signals identified a transient most significantly on the 2.048 s timescale, with a false alarm rate of 3.2e-05 Hz and a location consistent with the Swift-BAT event, using the standard search protocol with a S/N of 8. The GBM targeted search event was found with the highest significance with a "soft" spectrum (Band function with Epeak = 70 keV, alpha = -1.9, beta = -3.7) for a GRB.
[1] Goldstein et al. 2019 arXiv:1903.12597

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Jochen Greiner, last update: 23-Dec-2021 [Disclaimer]