Gamma-ray Burst 201229A

(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 29 Dec 20 11:06:14 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     1015088,   Seg_Num: 0
GRB_RA:          210.708d {+14h 02m 50s} (J2000),
                 210.910d {+14h 03m 38s} (current),
                 210.226d {+14h 00m 54s} (1950)
GRB_DEC:         +48.197d {+48d 11' 50"} (J2000),
                 +48.097d {+48d 05' 49"} (current),
                 +48.437d {+48d 26' 14"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       10266 [cnts]    Image_Peak=253 [image_cnts]
TRIGGER_DUR:     4.096 [sec] 
TRIGGER_INDEX:   300     E_range: 25-100 keV
BKG_INTEN:       91510 [cnts]
BKG_TIME:        39517.76 SOD {10:58:37.76} UT
BKG_DUR:         40 [sec]
GRB_DATE:        19212 TJD;   364 DOY;   20/12/29
GRB_TIME:        39570.94 SOD {10:59:30.94} UT
GRB_PHI:         -47.63 [deg]
GRB_THETA:        41.31 [deg]
SOLN_STATUS:     0x3
RATE_SIGNIF:     12.68 [sigma]
IMAGE_SIGNIF:    8.78 [sigma]
MERIT_PARAMS:     +1  +0  +0  +2  +2  -1  +0  +0  +6  +0 
SUN_POSTN:       278.92d {+18h 35m 42s}  -23.18d {-23d 10' 55"}
SUN_DIST:         93.62 [deg]   Sun_angle= 4.5 [hr] (West of Sun)
MOON_POSTN:       90.42d {+06h 01m 41s}  +24.29d {+24d 17' 20"}
MOON_DIST:        90.16 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:       94.29, 64.77 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      181.58, 55.02 [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 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 = 259.74,18.42 [deg].

red DSS finding chart ps-file

GCN NOTICE

 
TITLE:           GCN/SWIFT NOTICE 
NOTICE_DATE:     Tue 29 Dec 20 11:06:41 UT 
NOTICE_TYPE:     Swift-XRT Nack-Position 
TRIGGER_NUM:     1015088,   Seg_Num: 0 
POINT_RA:        210.677d {+14h 02m 42s} (J2000) 
POINT_DEC:       +48.208d {+48d 12' 28"} (J2000) 
IMG_START_DATE:  19212 TJD;   364 DOY;   20/12/29 
IMG_START_TIME:  39682.29 SOD {11:01:22.29} UT,   111.3 [sec] since BAT Trigger Time 
COUNTS:          6    Min_needed= 20 
STD_DEV:         0.00   Max_StdDev_for_Good=28.44 [arcsec] 
PH2_ITER:        1    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 29 Dec 20 11:07:44 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     1015088,   Seg_Num: 0
GRB_RA:          210.708d {+14h 02m 50s} (J2000),
                 210.910d {+14h 03m 38s} (current),
                 210.226d {+14h 00m 54s} (1950)
GRB_DEC:         +48.197d {+48d 11' 50"} (J2000),
                 +48.097d {+48d 05' 49"} (current),
                 +48.437d {+48d 26' 14"} (1950)
GRB_DATE:        19212 TJD;   364 DOY;   20/12/29
GRB_TIME:        39570.94 SOD {10:59:30.94} UT
TRIGGER_INDEX:   300
GRB_PHI:         -47.63 [deg]
GRB_THETA:        41.31 [deg]
DELTA_TIME:      -38.00 [sec]
TRIGGER_DUR:     4.096 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     12.68 [sigma]
IMAGE_SIGNIF:    8.78 [sigma]
LC_URL:          sw01015088000msb.lc
SUN_POSTN:       278.93d {+18h 35m 42s}  -23.18d {-23d 10' 55"}
SUN_DIST:         93.62 [deg]   Sun_angle= 4.5 [hr] (West of Sun)
MOON_POSTN:       90.44d {+06h 01m 45s}  +24.29d {+24d 17' 24"}
MOON_DIST:        90.15 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:       94.29, 64.77 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      181.58, 55.02 [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 = 259.74,18.42 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 29 Dec 20 11:08:12 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     1015088,   Seg_Num: 0
POINT_RA:        210.676d {+14h 02m 42s} (J2000)
POINT_DEC:       +48.208d {+48d 12' 28"} (J2000)
POINT_ROLL:      121.159d
IMG_START_DATE:  19212 TJD;   364 DOY;   20/12/29
IMG_START_TIME:  39687.64 SOD {11:01:27.64} UT,   116.7 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.612
N_STARS:         38
X_OFFSET:        640 [pixels]
Y_OFFSET:        467 [pixels]
X_MAX:           1599 [pixels]
Y_MAX:           1426 [pixels]
DET_THRESH:      11
PHOTO_THRESH:    5
SL_URL:          sw01015088000msufc0116.fits
SUN_POSTN:       278.93d {+18h 35m 42s}  -23.18d {-23d 10' 55"}
SUN_DIST:         93.64 [deg]   Sun_angle= 4.5 [hr] (West of Sun)
MOON_POSTN:       90.44d {+06h 01m 46s}  +24.29d {+24d 17' 26"}
MOON_DIST:        90.12 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:       94.35, 64.77 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      181.54, 55.01 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 29 Dec 20 11:09:34 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     1015088,   Seg_Num: 0
POINT_RA:        210.676d {+14h 02m 42s} (J2000)
POINT_DEC:       +48.208d {+48d 12' 28"} (J2000)
ROLL:            121.159d
IMG_START_DATE:  19212 TJD;   364 DOY;   20/12/29
IMG_START_TIME:  39687.64 SOD {11:01:27.64} UT,   116.7 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     630932513
X_OFFSET:        959 [pixels]
Y_OFFSET:        786 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1119
Y_GRB_POS:       946
BINNING_INDEX:   1
IM_URL:          sw01015088000msuni0143.fits
SUN_POSTN:       278.93d {+18h 35m 43s}  -23.18d {-23d 10' 55"}
SUN_DIST:         93.65 [deg]   Sun_angle= 4.5 [hr] (West of Sun)
MOON_POSTN:       90.45d {+06h 01m 49s}  +24.29d {+24d 17' 29"}
MOON_DIST:        90.11 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:       94.35, 64.77 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      181.54, 55.01 [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 29 Dec 20 11:08:25 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     1015088,   Seg_Num: 0
POINT_RA:        210.676d {+14h 02m 42s} (J2000)
POINT_DEC:       +48.208d {+48d 12' 28"} (J2000)
POINT_ROLL:      121.159d
IMG_START_DATE:  19212 TJD;   364 DOY;   20/12/29
IMG_START_TIME:  39687.64 SOD {11:01:27.64} UT,   116.7 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        1.612
N_STARS:         38
X_OFFSET:        640 [pixels]
Y_OFFSET:        467 [pixels]
X_MAX:           1599 [pixels]
Y_MAX:           1426 [pixels]
DET_THRESH:      11
PHOTO_THRESH:    5
SL_URL:          sw01015088000msufc0116.fits
SUN_POSTN:       278.93d {+18h 35m 42s}  -23.18d {-23d 10' 55"}
SUN_DIST:         93.64 [deg]   Sun_angle= 4.5 [hr] (West of Sun)
MOON_POSTN:       90.44d {+06h 01m 46s}  +24.29d {+24d 17' 26"}
MOON_DIST:        90.12 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:       94.35, 64.77 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      181.54, 55.01 [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 29 Dec 20 11:09:42 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     1015088,   Seg_Num: 0
POINT_RA:        210.676d {+14h 02m 42s} (J2000)
POINT_DEC:       +48.208d {+48d 12' 28"} (J2000)
ROLL:            121.159d
IMG_START_DATE:  19212 TJD;   364 DOY;   20/12/29
IMG_START_TIME:  39687.64 SOD {11:01:27.64} UT,   116.7 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     630932513
X_OFFSET:        959 [pixels]
Y_OFFSET:        786 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1119
Y_GRB_POS:       946
BINNING_INDEX:   1
IM_URL:          sw01015088000msuni0143.fits
SUN_POSTN:       278.93d {+18h 35m 43s}  -23.18d {-23d 10' 55"}
SUN_DIST:         93.65 [deg]   Sun_angle= 4.5 [hr] (West of Sun)
MOON_POSTN:       90.45d {+06h 01m 49s}  +24.29d {+24d 17' 30"}
MOON_DIST:        90.11 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:       94.35, 64.77 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      181.54, 55.01 [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 29 Dec 20 11:10:03 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     1015088,   Seg_Num: 0
GRB_RA:          210.6880d {+14h 02m 45.11s} (J2000),
                 210.8902d {+14h 03m 33.64s} (current),
                 210.2059d {+14h 00m 49.42s} (1950)
GRB_DEC:         +48.1986d {+48d 11' 54.9"} (J2000),
                 +48.0982d {+48d 05' 53.5"} (current),
                 +48.4386d {+48d 26' 19.0"} (1950)
GRB_ERROR:       3.6 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  19212 TJD;   364 DOY;   20/12/29
IMG_START_TIME:  39709.00 SOD {11:01:49.00} UT,   138.1 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       278.93d {+18h 35m 43s}  -23.18d {-23d 10' 55"}
SUN_DIST:         93.63 [deg]   Sun_angle= 4.5 [hr] (West of Sun)
MOON_POSTN:       90.46d {+06h 01m 50s}  +24.29d {+24d 17' 31"}
MOON_DIST:        90.12 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:       94.32, 64.78 [deg] galactic lon,lat of the burst
ECL_COORDS:      181.56, 55.01 [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 29 Dec 20 11:12:26 UT
NOTICE_TYPE:     Swift-UVOT Position
TRIGGER_NUM:     1015088,   Seg_Num: 0
GRB_RA:          210.6892d {+14h 02m 45.40s} (J2000),
                 210.8914d {+14h 03m 33.93s} (current),
                 210.2071d {+14h 00m 49.71s} (1950)
GRB_DEC:         +48.1982d {+48d 11' 53.5"} (J2000),
                 +48.0978d {+48d 05' 52.0"} (current),
                 +48.4382d {+48d 26' 17.5"} (1950)
GRB_ERROR:       0.6 [arcsec radius, statistical only]
GRB_MAG:         18.19 +/- 0.14 [mag]
FILTER:          10, White
IMG_START_DATE:  19212 TJD;   364 DOY;   20/12/29
IMG_START_TIME:  39684.00 SOD {11:01:24.00} UT,   113.1 [sec] since BAT Trigger Time
SUN_POSTN:       278.93d {+18h 35m 43s}  -23.18d {-23d 10' 54"}
SUN_DIST:         93.63 [deg]   Sun_angle= 4.5 [hr] (West of Sun)
MOON_POSTN:       90.48d {+06h 01m 55s}  +24.29d {+24d 17' 37"}
MOON_DIST:        90.11 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:       94.32, 64.78 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      181.56, 55.01 [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 NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 29 Dec 20 11:14:56 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     1015088,   Seg_Num: 0
POINT_RA:        210.675d {+14h 02m 42s} (J2000)
POINT_DEC:       +48.211d {+48d 12' 39"} (J2000)
POINT_ROLL:      121.158d
IMG_START_DATE:  19212 TJD;   364 DOY;   20/12/29
IMG_START_TIME:  39845.68 SOD {11:04:05.68} UT,   274.7 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.529
N_STARS:         42
X_OFFSET:        400 [pixels]
Y_OFFSET:        227 [pixels]
X_MAX:           1839 [pixels]
Y_MAX:           1666 [pixels]
DET_THRESH:      7
PHOTO_THRESH:    3
SL_URL:          sw01015088000msufc0274.fits
SUN_POSTN:       278.93d {+18h 35m 44s}  -23.18d {-23d 10' 54"}
SUN_DIST:         93.65 [deg]   Sun_angle= 4.5 [hr] (West of Sun)
MOON_POSTN:       90.50d {+06h 02m 01s}  +24.30d {+24d 17' 44"}
MOON_DIST:        90.08 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:       94.35, 64.77 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      181.53, 55.02 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 29 Dec 20 11:15:12 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     1015088,   Seg_Num: 0
POINT_RA:        210.675d {+14h 02m 42s} (J2000)
POINT_DEC:       +48.211d {+48d 12' 39"} (J2000)
POINT_ROLL:      121.158d
IMG_START_DATE:  19212 TJD;   364 DOY;   20/12/29
IMG_START_TIME:  39845.68 SOD {11:04:05.68} UT,   274.7 [sec] since BAT Trigger Time
FILTER:          7, U
BKG_MEAN:        0.529
N_STARS:         42
X_OFFSET:        400 [pixels]
Y_OFFSET:        227 [pixels]
X_MAX:           1839 [pixels]
Y_MAX:           1666 [pixels]
DET_THRESH:      7
PHOTO_THRESH:    3
SL_URL:          sw01015088000msufc0274.fits
SUN_POSTN:       278.93d {+18h 35m 44s}  -23.18d {-23d 10' 54"}
SUN_DIST:         93.65 [deg]   Sun_angle= 4.5 [hr] (West of Sun)
MOON_POSTN:       90.51d {+06h 02m 02s}  +24.30d {+24d 17' 45"}
MOON_DIST:        90.08 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:       94.35, 64.77 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      181.53, 55.02 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        All 4 attachments are included.

GCN Circular #29192
B. Sbarufatti (PSU), S. D. Barthelmy (GSFC), J.D. Gropp (PSU) and A. Y. Lien (GSFC/UMBC) report on behalf of the Neil Gehrels Swift Observatory Team:
At 10:59:30 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 201229A (trigger=1015088). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 210.708, +48.197 which is
```
   RA(J2000) = 14h 02m 50s
   Dec(J2000) = +48d 11' 50"
```
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 7 sec. The peak count rate was ~500 counts/sec (15-350 keV), at ~2 sec after the trigger.
The XRT began observing the field at 11:01:22.2 UT, 111.4 seconds after the BAT trigger. Using promptly downlinked data we find a fading, uncatalogued X-ray source with an enhanced position: RA, Dec 210.6891, 48.1976 which is equivalent to:
```
   RA(J2000)  = 14h 02m 45.39s
   Dec(J2000) = +48d 11' 51.2"
```
with an uncertainty of 2.2 arcseconds (radius, 90% containment). This location is 45 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.
A power-law fit to a spectrum formed from promptly downlinked event data gives a column density consistent with the Galactic value of 1.78 x 10^20 cm^-2 (Willingale et al. 2013).
UVOT took a finding chart exposure of 150 seconds with the White filter starting 116 seconds after the BAT trigger. There is a candidate afterglow in the rapidly available 2.7'x2.7' sub-image at
```
  RA(J2000)  =	14:02:45.41 = 210.68921
  DEC(J2000) = +48:11:53.8  =  48.19828
```
with a 90%-confidence error radius of about 0.62 arc sec. This position is 3.1 arc sec. from the center of the XRT error circle. The estimated magnitude is 18.19 with a 1-sigma error of about 0.14. No correction has been made for the expected extinction corresponding to E(B-V) of 0.01.
Burst Advocate for this burst is B. Sbarufatti (bxs60 AT psu.edu). 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 29 Dec 20 11:21:30 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     1015088,   Seg_Num: 0
POINT_RA:        210.675d {+14h 02m 42s} (J2000)
POINT_DEC:       +48.211d {+48d 12' 39"} (J2000)
POINT_ROLL:      121.158d
IMG_START_DATE:  19212 TJD;   364 DOY;   20/12/29
IMG_START_TIME:  40449.37 SOD {11:14:09.37} UT,   878.4 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        3.074
N_STARS:         57
X_OFFSET:        400 [pixels]
Y_OFFSET:        227 [pixels]
X_MAX:           1839 [pixels]
Y_MAX:           1666 [pixels]
DET_THRESH:      14
PHOTO_THRESH:    8
SL_URL:          sw01015088000msufc0878.fits
SUN_POSTN:       278.94d {+18h 35m 45s}  -23.18d {-23d 10' 53"}
SUN_DIST:         93.65 [deg]   Sun_angle= 4.5 [hr] (West of Sun)
MOON_POSTN:       90.57d {+06h 02m 16s}  +24.30d {+24d 18' 02"}
MOON_DIST:        90.04 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:       94.35, 64.77 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      181.53, 55.02 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 29 Dec 20 11:16:01 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     1015088,   Seg_Num: 0
POINT_RA:        210.675d {+14h 02m 42s} (J2000)
POINT_DEC:       +48.211d {+48d 12' 39"} (J2000)
ROLL:            121.158d
IMG_START_DATE:  19212 TJD;   364 DOY;   20/12/29
IMG_START_TIME:  39845.68 SOD {11:04:05.68} UT,   274.7 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     630932671
X_OFFSET:        959 [pixels]
Y_OFFSET:        786 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1119
Y_GRB_POS:       946
BINNING_INDEX:   1
IM_URL:          sw01015088000msuni0301.fits
SUN_POSTN:       278.93d {+18h 35m 44s}  -23.18d {-23d 10' 54"}
SUN_DIST:         93.65 [deg]   Sun_angle= 4.5 [hr] (West of Sun)
MOON_POSTN:       90.51d {+06h 02m 04s}  +24.30d {+24d 17' 47"}
MOON_DIST:        90.07 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:       94.35, 64.77 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      181.53, 55.02 [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 29 Dec 20 11:24:12 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     1015088,   Seg_Num: 0
POINT_RA:        210.675d {+14h 02m 42s} (J2000)
POINT_DEC:       +48.211d {+48d 12' 39"} (J2000)
ROLL:            121.158d
IMG_START_DATE:  19212 TJD;   364 DOY;   20/12/29
IMG_START_TIME:  40449.37 SOD {11:14:09.37} UT,   878.4 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     630933275
X_OFFSET:        959 [pixels]
Y_OFFSET:        786 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1119
Y_GRB_POS:       946
BINNING_INDEX:   1
IM_URL:          sw01015088000msuni0905.fits
SUN_POSTN:       278.94d {+18h 35m 45s}  -23.18d {-23d 10' 52"}
SUN_DIST:         93.65 [deg]   Sun_angle= 4.5 [hr] (West of Sun)
MOON_POSTN:       90.59d {+06h 02m 22s}  +24.30d {+24d 18' 09"}
MOON_DIST:        90.03 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:       94.35, 64.77 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      181.53, 55.02 [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 29 Dec 20 11:24:25 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     1015088,   Seg_Num: 0
POINT_RA:        210.675d {+14h 02m 42s} (J2000)
POINT_DEC:       +48.211d {+48d 12' 39"} (J2000)
ROLL:            121.158d
IMG_START_DATE:  19212 TJD;   364 DOY;   20/12/29
IMG_START_TIME:  40449.37 SOD {11:14:09.37} UT,   878.4 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     630933275
X_OFFSET:        959 [pixels]
Y_OFFSET:        786 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1119
Y_GRB_POS:       946
BINNING_INDEX:   1
IM_URL:          sw01015088000msuni0905.fits
SUN_POSTN:       278.94d {+18h 35m 45s}  -23.18d {-23d 10' 52"}
SUN_DIST:         93.65 [deg]   Sun_angle= 4.5 [hr] (West of Sun)
MOON_POSTN:       90.59d {+06h 02m 23s}  +24.30d {+24d 18' 10"}
MOON_DIST:        90.03 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:       94.35, 64.77 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      181.53, 55.02 [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 29 Dec 20 11:16:07 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     1015088,   Seg_Num: 0
POINT_RA:        210.675d {+14h 02m 42s} (J2000)
POINT_DEC:       +48.211d {+48d 12' 39"} (J2000)
ROLL:            121.158d
IMG_START_DATE:  19212 TJD;   364 DOY;   20/12/29
IMG_START_TIME:  39845.68 SOD {11:04:05.68} UT,   274.7 [sec] since BAT Trigger Time
FILTER:          7, U
EXPOSURE_ID:     630932671
X_OFFSET:        959 [pixels]
Y_OFFSET:        786 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1119
Y_GRB_POS:       946
BINNING_INDEX:   1
IM_URL:          sw01015088000msuni0301.fits
SUN_POSTN:       278.93d {+18h 35m 44s}  -23.18d {-23d 10' 54"}
SUN_DIST:         93.65 [deg]   Sun_angle= 4.5 [hr] (West of Sun)
MOON_POSTN:       90.52d {+06h 02m 04s}  +24.30d {+24d 17' 47"}
MOON_DIST:        90.07 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:       94.35, 64.77 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      181.53, 55.02 [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 29 Dec 20 11:21:41 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     1015088,   Seg_Num: 0
POINT_RA:        210.675d {+14h 02m 42s} (J2000)
POINT_DEC:       +48.211d {+48d 12' 39"} (J2000)
POINT_ROLL:      121.158d
IMG_START_DATE:  19212 TJD;   364 DOY;   20/12/29
IMG_START_TIME:  40449.37 SOD {11:14:09.37} UT,   878.4 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        3.074
N_STARS:         57
X_OFFSET:        400 [pixels]
Y_OFFSET:        227 [pixels]
X_MAX:           1839 [pixels]
Y_MAX:           1666 [pixels]
DET_THRESH:      14
PHOTO_THRESH:    8
SL_URL:          sw01015088000msufc0878.fits
SUN_POSTN:       278.94d {+18h 35m 45s}  -23.18d {-23d 10' 53"}
SUN_DIST:         93.65 [deg]   Sun_angle= 4.5 [hr] (West of Sun)
MOON_POSTN:       90.57d {+06h 02m 16s}  +24.30d {+24d 18' 02"}
MOON_DIST:        90.04 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:       94.35, 64.77 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      181.53, 55.02 [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 29 Dec 20 11:15:22 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     1015088,   Seg_Num: 0
GRB_RA:          210.6890d {+14h 02m 45.35s} (J2000),
                 210.8912d {+14h 03m 33.88s} (current),
                 210.2069d {+14h 00m 49.66s} (1950)
GRB_DEC:         +48.1976d {+48d 11' 51.3"} (J2000),
                 +48.0972d {+48d 05' 49.9"} (current),
                 +48.4376d {+48d 26' 15.3"} (1950)
GRB_ERROR:       2.2 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  19212 TJD;   364 DOY;   20/12/29
IMG_START_TIME:  39709.00 SOD {11:01:49.00} UT,   138.1 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       278.93d {+18h 35m 44s}  -23.18d {-23d 10' 54"}
SUN_DIST:         93.63 [deg]   Sun_angle= 4.5 [hr] (West of Sun)
MOON_POSTN:       90.51d {+06h 02m 02s}  +24.30d {+24d 17' 45"}
MOON_DIST:        90.09 [deg]
MOON_ILLUM:      100 [%]
GAL_COORDS:       94.32, 64.78 [deg] galactic lon,lat of the burst
ECL_COORDS:      181.56, 55.01 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        This is an Update Notice -- the RA,Dec values herein supersede the previous XRT_POS Notice.  
COMMENTS:        TAM values, flux and significance fields are not valid.  
COMMENTS:        This position was automatically generated on the ground using  
COMMENTS:        Photon Counting data telemetered via TDRSS (SPER data).  
COMMENTS:        See http://www.swift.ac.uk/sper/docs.php for details.  
COMMENTS:        This position was enhanced using UVOT field astrometry.  
COMMENTS:        The probability that this is a serendipitous source in the  
COMMENTS:        SPER window is 0.58% < P(seren) < 1.1%.

GCN Circular #29193
J.P. Osborne, A.P. Beardmore, P.A. Evans and M.R. Goad (U. Leicester) report on behalf of the Swift-XRT team.
Using 1463 s of XRT Photon Counting mode data and 2 UVOT images for GRB 201229A, 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 = 210.68844, +48.19775 which is equivalent to:
```
RA (J2000): 14h 02m 45.23s
Dec (J2000): +48d 11' 51.9"
```
with an uncertainty of 1.7 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 #29199
A. Y. Lien (GSFC/UMBC), S. D. Barthelmy (GSFC), H. A. Krimm (NSF), S. Laha (GSFC/UMBC), C. B. Markwardt (GSFC), D. M. Palmer (LANL), T. Sakamoto (AGU), B. Sbarufatti (PSU) 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 201229A (trigger #1015088) (Sbarufatti et al., GCN Circ. 29192). The BAT ground-calculated position is RA, Dec = 210.692, 48.209 deg which is
```
   RA(J2000)  =  14h 02m 46.1s
   Dec(J2000) = +48d 12' 33.0"
```
with an uncertainty of 2.6 arcmin, (radius, sys+stat, 90% containment). The partial coding was 26%.
The mask-weighted light curve shows a multi-peaked structure that starts at ~T-45 s and ends at ~T+15 s. There is a weak pulse occurring at ~T-40 s, followed by the main peak at ~T0. T90 (15-350 keV) is 53.3 +- 4.6 sec (estimated error including systematics).
The time-averaged spectrum from T-44.43 to T+13.62 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.40 +- 0.29. The fluence in the 15-150 keV band is 1.3 +- 0.2 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+0.41 sec in the 15-150 keV band is 1.7 +- 0.4 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/1015088/BA/
GCN Circular #29200
A. D'Ai (INAF-IASFPA), D.N. Burrows (PSU), J. D. Gropp (PSU), A.P. Beardmore (U. Leicester), P.A. Evans (U. Leicester), J.P. Osborne (U. Leicester), A. Melandri (INAF-OAB), T. Sbarrato (INAF-OAB) and B. Sbarufatti report on behalf of the Swift-XRT team:
We have analysed 8.6 ks of XRT data for GRB 201229A (Sbarufatti et al. GCN Circ. 29192), from 114 s to 34.8 ks after the BAT trigger. The data comprise 22 s in Windowed Timing (WT) mode with the remainder in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Osborne et al. (GCN Circ. 29193).
The light curve can be modelled with an initial power-law decay with an index of alpha=2.2 (+0.5, -0.3), followed by a break at T+262 s to an alpha of 0.49 (+/-0.03).
A spectrum formed from the PC mode data can be fitted with an absorbed power-law with a photon spectral index of 1.80 (+/-0.12). The best-fitting absorption column is 1.3 (+/-0.4) x 10^21 cm^-2, in excess of the Galactic value of 1.8 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 3.8 x 10^-11 (3.9 x 10^-11) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
```
Total column:	     1.3 (+/-0.4) x 10^21 cm^-2
Galactic foreground: 1.8 x 10^20 cm^-2
Excess significance: 5.2 sigma
Photon index:	     1.80 (+/-0.12)
```
If the light curve continues to decay with a power-law decay index of 0.49, the count rate at T+24 hours will be 0.048 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 1.8 x 10^-12 (1.9 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/01015088.
This circular is an official product of the Swift-XRT team.
GCN Circular #29203
S.Y. Fu (NAOC), Z.P. Zhu (HUST,NAOC), X. Liu, D. Xu (NAOC), X. Gao (Urumqi No.1 Senior High School), J.Z. Liu (XAO) report:
We observed the field of GRB 201229A (Sbarufatti et al., GCN 29192) using the NEXT-0.6m telescope located at Nanshan, Xinjiang, China. We obtained 5 x 200 s frames in the Sloan r-band, starting at 19:52:23 UT on 2020-12-29, i.e., 8.88 hr after the burst.
No optical source is detected in our stacked image at the Swift/UVOT position (Sbarufatti et al., GCN 29192), down to a upper limiting of r~20.4, calibrated with the nearby PanSTARRS field.
GCN Circular #29204
A. S. Moskvitin, O. I. Spiridonova (SAO RAS) on behalf of GRB follow-up team report.
We observed the field of the GRB 201229A (B. Sbarufatti et al., GCN #29192) with the SAO RAS 1m telescope Zeiss-1000 equipped with CCD photometer on December 30, 00:43:31 -- 01:40:03 UT (T_mid - T0 = 0.59186 days).
The possible OT reported by Swift team is clearly detected in the stacked 6 x 300 sec. Rc band image with the coordinates R.A. = 14:02:45.38, Dec. = +48:11:53.5 +/- 0".1 (J2000). Preliminary photometry of the object is R = 21.29 +/- 0.1 (based on R2 magnitudes of nearby USNO-B1 stars). Using UVOT and NEXT-0.6m results (S.Y. Fu et al., GCN# 29203) we confirm the GRB OT.
GCN Circular #29205
N. Pankov (IKI, HSE), A. Pozanenko (IKI), R. Ya. Inasaridze (AbAO), I. Reva (FAI), V. R. Ayvazian (AbAO), G. V. Kapanadze (AbAO), S. Belkin (IKI) report on behalf of IKI-GRB-FuN:
We observed the field of GRB 201229A (Sbarufatti et al., GCN 29192) with AS-32 telescope of Abastumani observatory (AbAO), and Zeiss-1000 telescope of TSHAO in R-filter. We detected the optical object at the edge of enhanced XRT position (Osborne et al., GCN 29193). An optical afterglow candidate (Sbarufatti et al., GCN 29192; Moskvitin at al., GCN 29204) is detected in AbAO observations and not detected in TSHAO observations with shallow upper limit. Coordinates of the optical object (J2000) 14:02:45.36 +48:11:53.5 with uncertainty of 0.3 arcsec (in both coordinates) are consistent with coordinates reported by UVOT (Sbarufatti et al., GCN 29192) and SAO RAS (Moskvitin at al., GCN 29204). Preliminary photometry of the object is following
```
Date       UT start   t-T0    Filter Exp.    OT    Err.  UL(3sigma)
                        (mid, days)   (s)

2020-12-29  20:38:18   0.42095  R    23*120  n/d   n/d  20.2  Zeiss-1000
2020-12-30  01:52:12   0.64354  R    68*60   21.1  0.2  21.3  AS-32
```
The photometry is based on SDSS DR12 star (Lupton transformations)
```
RA         DEC       R(Lupton)
210.720000 48.157954 18.28
```
The non-detection of the object by Zeiss-1000 is consistent with Nanshan/NEXT optical upper limit (Fu et al., GCN 29203).
The object is absent in SDSS DR12 and we confirm the afterglow of GRB 201229A.

GCN Circular #29213
M. H. Siegel (PSU) and B. Sbarufatti (PSU) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 201229A 117 s after the BAT trigger (Sbarufatti et al., GCN Circ. 29192). A source consistent with the XRT position (Osborne et al. GCN Circ. 29193) is detected in the initial UVOT exposures, consistent with the optical transient reported in the initial circular and confirmed by SAO (Moskvitin et al., GCN Circ. 29203) and AbAO (Pankov et al., GCN Circ. 29205).
The preliminary UVOT position is:

    RA  (J2000) =  14:02:45.40 = 210.68916 (deg.)
    Dec (J2000) = +48:11:53.3  =  48.19814 (deg.)

with an estimated uncertainty of 0.44 arc sec. (radius, 90% confidence).
Preliminary detections and 3-sigma upper limits using the UVOT photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the early exposures are:

Filter         T_start(s)   T_stop(s)      Exp(s)           Mag

white (fc)         117          266          147      18.22 +/- 0.05
white              555          749           38      18.50+/-0.13
white              879         1029          147      19.17+/-0.13
white             1182         1548           58      19.42+/-0.34
white            23280        24102          801      20.88+/-0.22
v                  605         1597          116     >18.48
v                17146        34853         1217     >20.39
b                  531         1523           97     >19.33
b                22367        23274          885     >21.24
u (fc)             275          525          245      18.13+/-0.09
u                  680         5086          107      18.57+/-0.25
u                12362        29756         1220      20.54+/-0.34
uvw1               654         5071          254      19.04+/-0.25
uvw1             28021        28921          885     >20.45
uvw2             16239        34408         1771      20.27+/-0.21

The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.01 in the direction of the burst (Schlegel et al. 1998).

Back to JG's homepage

Jochen Greiner, last update: 01-Jan-2021 [Disclaimer]