Gamma-ray Burst 190123A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

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Results of Observations

GCN/BACODINE POSITION NOTICE

 
TITLE:           GCN/SWIFT NOTICE 
NOTICE_DATE:     Wed 23 Jan 19 12:20:07 UT 
NOTICE_TYPE:     Swift-BAT GRB Position 
TRIGGER_NUM:     885314,   Seg_Num: 0 
GRB_RA:           53.229d {+03h 32m 55s} (J2000), 
                  53.560d {+03h 34m 14s} (current), 
                  52.364d {+03h 29m 27s} (1950) 
GRB_DEC:         +45.484d {+45d 29' 02"} (J2000), 
                 +45.547d {+45d 32' 50"} (current), 
                 +45.316d {+45d 18' 56"} (1950) 
GRB_ERROR:       3.00 [arcmin radius, statistical only] 
GRB_INTEN:       21045 [cnts]    Image_Peak=624 [image_cnts] 
TRIGGER_DUR:     8.192 [sec]  
TRIGGER_INDEX:   477     E_range: 25-100 keV 
BKG_INTEN:       143457 [cnts] 
BKG_TIME:        44265.70 SOD {12:17:45.70} UT 
BKG_DUR:         64 [sec] 
GRB_DATE:        18506 TJD;    23 DOY;   19/01/23 
GRB_TIME:        44353.19 SOD {12:19:13.19} UT 
GRB_PHI:         -146.05 [deg] 
GRB_THETA:        32.22 [deg]
SOLN_STATUS:     0x20000003 
RATE_SIGNIF:     16.55 [sigma] 
IMAGE_SIGNIF:    11.49 [sigma] 
MERIT_PARAMS:     +1  +0  +0  +3  +2  +1  +0  +1 +43  +0  
SUN_POSTN:       305.49d {+20h 21m 59s}  -19.44d {-19d 26' 23"} 
SUN_DIST:        116.26 [deg]   Sun_angle= -7.2 [hr] (East of Sun) 
MOON_POSTN:      158.49d {+10h 33m 57s}  +12.49d {+12d 29' 09"} 
MOON_DIST:        91.25 [deg] 
MOON_ILLUM:      92 [%] 
GAL_COORDS:      150.28, -8.64 [deg] galactic lon,lat of the burst (or transient) 
ECL_COORDS:       62.29, 25.52 [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 = 185.68,15.49 [deg].   
COMMENTS:            
COMMENTS:        NOTE: This BAT event is temporally(5.0<100sec) coincident with the FERMI_GBM event (trignum=569938763).

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 23 Jan 19 12:21:48 UT
NOTICE_TYPE:     Swift-XRT Processed Image
TRIGGER_NUM:     885314,   Seg_Num: 0
GRB_RA:           53.2241d {+03h 32m 53.7s} (J2000),
                  53.5552d {+03h 34m 13.2s} (current),
                  52.3584d {+03h 29m 26.0s} (1950)
GRB_DEC:         +45.5263d {+45d 31' 34.6"} (J2000),
                 +45.5896d {+45d 35' 22.5"} (current),
                 +45.3579d {+45d 21' 28.5"} (1950)
GRB_ERROR:       5.8 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       27 [cnts]
IMG_START_DATE:  18506 TJD;    23 DOY;   19/01/23
IMG_START_TIME:  44470.49 SOD {12:21:10.49} UT,   117.3 [sec] since BAT Trigger Time
CENTROID_X:      292.20,  raw= 292  [pixels]
CENTROID_Y:      244.16,  raw= 244  [pixels]
ROLL:            268.18 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   -127.85
GRB_POS_XRT_Z:   -33.47
IMAGE_URL:       sw00885314000msxps_rw.img
SUN_POSTN:       305.50d {+20h 21m 59s}  -19.44d {-19d 26' 22"}
SUN_DIST:        116.25 [deg]   Sun_angle= -7.2 [hr] (East of Sun)
MOON_POSTN:      158.50d {+10h 34m 01s}  +12.48d {+12d 28' 50"}
MOON_DIST:        91.25 [deg]
MOON_ILLUM:      92 [%]
GAL_COORDS:      150.25, -8.61 [deg] galactic lon,lat of the burst
ECL_COORDS:       62.29, 25.56 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Processed Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 23 Jan 19 12:21:35 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     885314,   Seg_Num: 0
GRB_RA:           53.2241d {+03h 32m 53.78s} (J2000),
                  53.5552d {+03h 34m 13.24s} (current),
                  52.3584d {+03h 29m 26.01s} (1950)
GRB_DEC:         +45.5263d {+45d 31' 34.6"} (J2000),
                 +45.5896d {+45d 35' 22.5"} (current),
                 +45.3579d {+45d 21' 28.5"} (1950)
GRB_ERROR:       5.9 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       7.12e-10 [erg/cm2/sec]
GRB_SIGNIF:      5.19 [sigma]
IMG_START_DATE:  18506 TJD;    23 DOY;   19/01/23
IMG_START_TIME:  44470.49 SOD {12:21:10.49} UT,   117.3 [sec] since BAT Trigger Time
TAM[0-3]:        327.65 237.22 261.64 243.54
AMPLIFIER:       2
WAVEFORM:        134
SUN_POSTN:       305.50d {+20h 21m 59s}  -19.44d {-19d 26' 22"}
SUN_DIST:        116.25 [deg]   Sun_angle= -7.2 [hr] (East of Sun)
MOON_POSTN:      158.50d {+10h 34m 01s}  +12.48d {+12d 28' 53"}
MOON_DIST:        91.25 [deg]
MOON_ILLUM:      92 [%]
GAL_COORDS:      150.25, -8.61 [deg] galactic lon,lat of the burst
ECL_COORDS:       62.29, 25.56 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:        The XRT position is 2.54 arcmin from the BAT position.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 23 Jan 19 12:21:45 UT
NOTICE_TYPE:     Swift-XRT Image
TRIGGER_NUM:     885314,   Seg_Num: 0
GRB_RA:           53.2241d {+03h 32m 53.7s} (J2000),
                  53.5552d {+03h 34m 13.2s} (current),
                  52.3584d {+03h 29m 26.0s} (1950)
GRB_DEC:         +45.5263d {+45d 31' 34.6"} (J2000),
                 +45.5896d {+45d 35' 22.5"} (current),
                 +45.3579d {+45d 21' 28.5"} (1950)
GRB_ERROR:       5.8 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       27 [cnts]
IMG_START_DATE:  18506 TJD;    23 DOY;   19/01/23
IMG_START_TIME:  44470.49 SOD {12:21:10.49} UT,   117.3 [sec] since BAT Trigger Time
CENTROID_X:      292.20,  raw= 292  [pixels]
CENTROID_Y:      244.16,  raw= 244  [pixels]
ROLL:            268.18 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   -127.85
GRB_POS_XRT_Z:   -33.47
IMAGE_URL:       sw00885314000msxps_rw.img
SUN_POSTN:       305.50d {+20h 21m 59s}  -19.44d {-19d 26' 22"}
SUN_DIST:        116.25 [deg]   Sun_angle= -7.2 [hr] (East of Sun)
MOON_POSTN:      158.50d {+10h 34m 01s}  +12.48d {+12d 28' 51"}
MOON_DIST:        91.25 [deg]
MOON_ILLUM:      92 [%]
GAL_COORDS:      150.25, -8.61 [deg] galactic lon,lat of the burst
ECL_COORDS:       62.29, 25.56 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 23 Jan 19 12:22:59 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     885314,   Seg_Num: 0
GRB_RA:           53.229d {+03h 32m 55s} (J2000),
                  53.560d {+03h 34m 14s} (current),
                  52.364d {+03h 29m 27s} (1950)
GRB_DEC:         +45.484d {+45d 29' 02"} (J2000),
                 +45.547d {+45d 32' 50"} (current),
                 +45.316d {+45d 18' 56"} (1950)
GRB_DATE:        18506 TJD;    23 DOY;   19/01/23
GRB_TIME:        44353.19 SOD {12:19:13.19} UT
TRIGGER_INDEX:   477
GRB_PHI:         -146.05 [deg]
GRB_THETA:        32.22 [deg]
DELTA_TIME:      52.00 [sec]
TRIGGER_DUR:     8.192 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     16.55 [sigma]
IMAGE_SIGNIF:    11.49 [sigma]
LC_URL:          sw00885314000msb.lc
SUN_POSTN:       305.50d {+20h 21m 59s}  -19.44d {-19d 26' 21"}
SUN_DIST:        116.25 [deg]   Sun_angle= -7.2 [hr] (East of Sun)
MOON_POSTN:      158.52d {+10h 34m 04s}  +12.48d {+12d 28' 37"}
MOON_DIST:        91.28 [deg]
MOON_ILLUM:      92 [%]
GAL_COORDS:      150.28, -8.64 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       62.29, 25.52 [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 = 185.68,15.49 [deg].

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 23 Jan 19 12:24:07 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     885314,   Seg_Num: 0
POINT_RA:         53.239d {+03h 32m 57s} (J2000)
POINT_DEC:       +45.491d {+45d 29' 27"} (J2000)
POINT_ROLL:      268.185d
IMG_START_DATE:  18506 TJD;    23 DOY;   19/01/23
IMG_START_TIME:  44477.55 SOD {12:21:17.55} UT,   124.4 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.254
N_STARS:         150
X_OFFSET:        504 [pixels]
Y_OFFSET:        472 [pixels]
X_MAX:           1463 [pixels]
Y_MAX:           1431 [pixels]
DET_THRESH:      12
PHOTO_THRESH:    6
SL_URL:          sw00885314000msufc0124.fits
SUN_POSTN:       305.50d {+20h 21m 59s}  -19.44d {-19d 26' 20"}
SUN_DIST:        116.26 [deg]   Sun_angle= -7.2 [hr] (East of Sun)
MOON_POSTN:      158.53d {+10h 34m 07s}  +12.47d {+12d 28' 24"}
MOON_DIST:        91.28 [deg]
MOON_ILLUM:      92 [%]
GAL_COORDS:      150.28, -8.63 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       62.29, 25.52 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 23 Jan 19 12:24:25 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     885314,   Seg_Num: 0
POINT_RA:         53.239d {+03h 32m 57s} (J2000)
POINT_DEC:       +45.491d {+45d 29' 27"} (J2000)
POINT_ROLL:      268.185d
IMG_START_DATE:  18506 TJD;    23 DOY;   19/01/23
IMG_START_TIME:  44477.55 SOD {12:21:17.55} UT,   124.4 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.254
N_STARS:         150
X_OFFSET:        504 [pixels]
Y_OFFSET:        472 [pixels]
X_MAX:           1463 [pixels]
Y_MAX:           1431 [pixels]
DET_THRESH:      12
PHOTO_THRESH:    6
SL_URL:          sw00885314000msufc0124.fits
SUN_POSTN:       305.50d {+20h 21m 59s}  -19.44d {-19d 26' 20"}
SUN_DIST:        116.26 [deg]   Sun_angle= -7.2 [hr] (East of Sun)
MOON_POSTN:      158.53d {+10h 34m 07s}  +12.47d {+12d 28' 21"}
MOON_DIST:        91.28 [deg]
MOON_ILLUM:      92 [%]
GAL_COORDS:      150.28, -8.63 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       62.29, 25.52 [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:     Wed 23 Jan 19 12:25:33 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     885314,   Seg_Num: 0
POINT_RA:         53.239d {+03h 32m 57s} (J2000)
POINT_DEC:       +45.491d {+45d 29' 27"} (J2000)
ROLL:            268.185d
IMG_START_DATE:  18506 TJD;    23 DOY;   19/01/23
IMG_START_TIME:  44477.55 SOD {12:21:17.55} UT,   124.4 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     569938899
X_OFFSET:        985 [pixels]
Y_OFFSET:        1047 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1145
Y_GRB_POS:       1207
BINNING_INDEX:   1
IM_URL:          sw00885314000msuni0147.fits
SUN_POSTN:       305.50d {+20h 22m 00s}  -19.44d {-19d 26' 20"}
SUN_DIST:        116.26 [deg]   Sun_angle= -7.2 [hr] (East of Sun)
MOON_POSTN:      158.54d {+10h 34m 10s}  +12.47d {+12d 28' 08"}
MOON_DIST:        91.29 [deg]
MOON_ILLUM:      92 [%]
GAL_COORDS:      150.28, -8.63 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       62.29, 25.52 [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:     Wed 23 Jan 19 12:25:47 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     885314,   Seg_Num: 0
POINT_RA:         53.239d {+03h 32m 57s} (J2000)
POINT_DEC:       +45.491d {+45d 29' 27"} (J2000)
ROLL:            268.185d
IMG_START_DATE:  18506 TJD;    23 DOY;   19/01/23
IMG_START_TIME:  44477.55 SOD {12:21:17.55} UT,   124.4 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     569938899
X_OFFSET:        985 [pixels]
Y_OFFSET:        1047 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1145
Y_GRB_POS:       1207
BINNING_INDEX:   1
IM_URL:          sw00885314000msuni0147.fits
SUN_POSTN:       305.50d {+20h 22m 00s}  -19.44d {-19d 26' 19"}
SUN_DIST:        116.26 [deg]   Sun_angle= -7.2 [hr] (East of Sun)
MOON_POSTN:      158.54d {+10h 34m 11s}  +12.47d {+12d 28' 05"}
MOON_DIST:        91.29 [deg]
MOON_ILLUM:      92 [%]
GAL_COORDS:      150.28, -8.63 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:       62.29, 25.52 [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 #23769
A. D'Ai (INAF-IASFPA), D. N. Burrows (PSU), J.D. Gropp (PSU), N. P. M. Kuin (UCL-MSSL), K. L. Page (U Leicester) and M. H. Siegel (PSU) report on behalf of the Neil Gehrels Swift Observatory Team:
At 12:19:13 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 190123A (trigger=885314). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 53.229, +45.484 which is
```
   RA(J2000) = 03h 32m 55s
   Dec(J2000) = +45d 29' 02"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a single-peaked structure with a duration of about 20 sec. The peak count rate was ~1400 counts/sec (15-350 keV), at ~4 sec after the trigger.
The XRT began observing the field at 12:21:10.4 UT, 117.3 seconds after the BAT trigger. Using promptly downlinked data we find a bright, uncatalogued X-ray source located at RA, Dec 53.22071, 45.52425 which is equivalent to:
```
   RA(J2000)  = 03h 32m 52.97s
   Dec(J2000) = +45d 31' 27.3"
```
with an uncertainty of 4.0 arcseconds (radius, 90% containment). This location is 146 arcseconds from the BAT onboard position, within the BAT error circle. This position may be improved as more data are received; the latest position is available at http://www.swift.ac.uk/sper. We cannot determine whether the source is fading at the present time. No spectrum from the promptly downlinked event data is yet available to determine the column density.
The initial flux in the 2.5 s image was 7.12e-10 erg cm^-2 s^-1 (0.2-10 keV).
UVOT took a finding chart exposure of 125 seconds with the White filter starting 124 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 extinction.
Burst Advocate for this burst is A. D'Ai (antonino.dai AT gmail.com). Please contact the BA by email if you require additional information regarding Swift followup of this burst. In extremely urgent cases, after trying the Burst Advocate, you can contact the Swift PI by phone (see Swift TOO web site for information: http://www.swift.psu.edu/too.html.)

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 23 Jan 19 12:36:00 UT
NOTICE_TYPE:     Swift-XRT Position UPDATE
TRIGGER_NUM:     885314,   Seg_Num: 0
GRB_RA:           53.2207d {+03h 32m 52.96s} (J2000),
                  53.5518d {+03h 34m 12.42s} (current),
                  52.3550d {+03h 29m 25.20s} (1950)
GRB_DEC:         +45.5242d {+45d 31' 27.1"} (J2000),
                 +45.5875d {+45d 35' 14.9"} (current),
                 +45.3558d {+45d 21' 20.9"} (1950)
GRB_ERROR:       4.0 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  18506 TJD;    23 DOY;   19/01/23
IMG_START_TIME:  44537.00 SOD {12:22:17.00} UT,   183.8 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:       305.51d {+20h 22m 01s}  -19.44d {-19d 26' 13"}
SUN_DIST:        116.24 [deg]   Sun_angle= -7.2 [hr] (East of Sun)
MOON_POSTN:      158.65d {+10h 34m 36s}  +12.44d {+12d 26' 09"}
MOON_DIST:        91.38 [deg]
MOON_ILLUM:      92 [%]
GAL_COORDS:      150.25, -8.61 [deg] galactic lon,lat of the burst
ECL_COORDS:       62.29, 25.56 [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:        The probability that this is a serendipitous source in the  
COMMENTS:        SPER window is 0.11% < P(seren) < 0.58%.

GCN Circular #23770
V. Lipunov, V.Kornilov, E. Gorbovskoy, N.Tiurina, P.Balanutsa, D.Vlasenko, V.Vladimirov, A.Kuznetsov, D.Kuvshinov, A.Chasovnikov (Lomonosov Moscow State University,SAI, Physics Department),
O. Gres, N.M. Budnev, (Applied Physics Institute of Irkutsk State University)
V. Yurkov, A. Gabovich, Yu. Sergienko, D. Kobcev (Blagoveschensk Educational State University)
R. Rebolo, M. Serra, N. Lodieu, G. Israelian, L. Suarez-Andres (The Instituto de Astrofisica de Canarias)
D. Buckley (South African Astronomical Observatory)
A. Tlatov, V.Senik, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory)
R. Podesta, C. Lopez, C.Francile, F. Podesta Observatorio Astronomico Felix Aguilar (OAFA)
H. Levato (Instituto de Ciencias Astronomicas, de la Tierra y del Espacio ICATE)
MASTER-Tunka robotic telescope (MASTER Global Robotic Net http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, v.2010, 30L) located in Russia (Applied Physics Institute, Irkutsk State University) was pointed to the GRB190123A 17 sec after notice time (66 sec after trigger time) at 2019-01-23 12:20:25 UT. On our first (10s exposure) image we don't find optical transient within SWIFT-XRT error-box ( A. D'Ai et al. GCN 23769 RA,Dec(2000)=03h 32m 52.97s +45d 31' 27.3" r=4") up to 16.7 unfiltered magnitude limit (5-sigma)
The galactic latitude b = -8 deg., longitude l = 151 deg. The observations made on zenit distance = 7 deg. The Moon altitude is -1 deg. (92 % bright part) The sun altitude is -24.7 deg.
MASTER-Amur robotic telescope ocated in Russia (Blagoveshchensk State Pedagogical University) was pointed to the GRB190123A 27 sec after notice time (77 sec after trigger time) at 2019-01-23 12:20:35 UT. On our first (10s exposure, mlim=16.3 (5-sigma)) image we don't find optical transient within SWIFT-XRT error-box.
The observations made on zenit distance = 15 deg. The moon (92 % bright part) is 14 deg. above the horizon. The sun altitude is -40.1 deg.
The message may be cited.
GCN Circular #23771
A.P. Beardmore, P.A. Evans, M.R. Goad and J.P. Osborne (U. Leicester) report on behalf of the Swift-XRT team.
Using 80 s of XRT Photon Counting mode data and 1 UVOT images for GRB 190123A, 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 = 53.22060, +45.52531 which is equivalent to:
```
RA (J2000): 03h 32m 52.94s
Dec (J2000): +45d 31' 31.1"
```
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 #23772
Y.-D. Hu, X.-Y.Li, E. Fernandez-Garcia, A. Ayala, A. J. Castro-Tirado (IAA-CSIC), C. Perez del Pulgar, A. Castellon, I. Carrasco (Univ. de Malaga),� S. Guziy (Univ. of Nikolaev) and D. Xiong, Y. Fan, X. Zhao, J. Bai, C. Wang, Y. Xin (Yunnan Nacional Astronomical Observatory) on behalf of a larger collaboration, report:
"Following the detection of GRB 190123A by Swift (D'Ai et al. GCNC 23769), the 0.6m BOOTES-4/MET robotic telescope at Lijiang Astronomical Observatory (China) gathered images starting at 12:36 UT (~0.29 hr after trigger). No optical afterglow is found down to 20.9 mag (unfiltered images) within the Swift/XRT error box, consistent with the non-detections by Swift/UVOT (D'Ai et al. GCNC 23769) or MASTER (Lipunov et al. GCNC 23770). Observations are ongoing."
GCN Circular #23773
E. Bissaldi (Politecnico & INFN Bari) reports on behalf of the Fermi GBM Team:
"At 12:19:18.22 UT on 23 January 2019, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 190123A (trigger 569938763 / 190123513), which was also detected by the Swift/BAT (D'Ai et al. 2019, GCN 23769). The GBM on-ground location is consistent with the Swift position.
The angle from the Fermi LAT boresight at the GBM trigger time is 42 degrees.
The GBM light curve consists of a multipeaked emission episode with a duration (T90) of about 17 s (50-300 keV). The time-averaged spectrum from T0-5.1 s to T0+10.8 s is adequately fit by a power law function with an exponential high-energy cutoff. The power law index is -0.68 +/- 0.25 and the cutoff energy, parameterized as Epeak, is 310 +/- 100 keV.
The event fluence (10-1000 keV) in this time interval is (2.07 +/- 0.04)E-06 erg/cm^2. The 1-sec peak photon flux measured starting from T0+7.1 s in the 10-1000 keV band is 1.8 +/- 0.2 ph/s/cm^2.
The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog."
GCN Circular #23774
D.Steeghs, J.Lyman, K.Ulaczyk (U. Warwick), G.Ramsay (Armagh O.), M.Dyer (U. Sheffield), A.Obradovic, K. Ackley, D.K. Galloway, E.Rol (Monash U.), K. Wiersema, B.Gompertz, A.Levan, R.Cutter (U. Warwick), V.Dhillon (U. Sheffield), P.O'Brien, R.Starling (U. Leicester), S.Poshyachinda (NARIT), D.Pollacco (U. Warwick), E.Thrane (Monash U.), E.Palle (IAC)
report on behalf of the GOTO collaboration:
In response to GRB 190123A (D'Ai et al. GCN Circ. 23769), the Gravitational-wave Optical Transient Observer (GOTO) observed the field covering the Swift BAT/XRT positions.
Observations started at 2019-01-23T19:51:53 (7.54 hours post burst) consisting of a set of 5x120s exposures in our wide L filter (400-700nm). In line with other reports (Hu et al. GCN 23772; Lipunov et al. GCN 23770), no optical source g<21.0 is visible at the updated XRT position (Beardmore et al. GCN 23771), based on PS1 and SDSS calibrators.
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 Astrofisica de Canarias (IAC) (https://goto-observatory.org/)
GCN Circular #23775
A. Tohuvavohu (PSU), S. J. LaPorte (PSU), J.A. Kennea (PSU), P.A. Evans (U. Leicester), J.P. Osborne (U. Leicester), K.L. Page (U. Leicester), A. Melandri (INAF-OAB), P. D'Avanzo (INAF-OAB), V. D'Elia (ASDC) and A. D'Ai report on behalf of the Swift-XRT team:
We have analysed 8.3 ks of XRT data for GRB 190123A (D'Ai et al. GCN Circ. 23769), from 123 s to 33.3 ks after the BAT trigger. The data comprise 41 s in Windowed Timing (WT) mode with the remainder in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Beardmore et al. (GCN Circ. 23771).
The light curve can be modelled with a power-law decay with a decay index of alpha=1.28 (+0.06, -0.05).
A spectrum formed from the PC mode data can be fitted with an absorbed power-law with a photon spectral index of 1.8 (+0.5, -0.4). The best-fitting absorption column is 2.3 (+0.9, -0.7) x 10^22 cm^-2, in excess of the Galactic value of 4.4 x 10^21 cm^-2 (Willingale et al. 2013). The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 7.0 x 10^-11 (1.3 x 10^-10) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
```
Total column:	     2.3 (+0.9, -0.7) x 10^22 cm^-2
Galactic foreground: 4.4 x 10^21 cm^-2
Excess significance: 4.3 sigma
Photon index:	     1.8 (+0.5, -0.4)
```
If the light curve continues to decay with a power-law decay index of 1.28, the count rate at T+24 hours will be 1.2 x 10^-3 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 8.6 x 10^-14 (1.6 x 10^-13) erg cm^-2 s^-1.
The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00885314.
This circular is an official product of the Swift-XRT team.
GCN Circular #23777
J. Mao, L.-F. Xing, M. Xiao, J.-M. Bai (YNAO) report:
We observed the field of GRB 190123A (D'Ai et al. GCN Circ. 23769) with the 2.4-meter optical telescope at Gao-Mei-Gu (GMG) station of Yunnan Observatories. The observation began at UT 13:15:51, 23, Jan, 2019, about 1 hour after the trigger. We did not detect any source within the Swift-XRT error circle down to a magnitude of R~22.7.
GCN Circular #23778
K. Shiraishi, K. L. Murata, R. Itoh, Y. Tachibana, S. Harita, K. Morita, K. Iida, M. Niwano, R. Adachi, M. Oeda, Y. Yatsu, and N. Kawai (Tokyo Tech) report on behalf of the MITSuME collaboration
We searched for the optical counterpart of GRB 190123A (A. D'Ai et al., GCN #23769) with the optical three color (g', Rc, and Ic) CCD cameras attached to the MITSuME 50 cm telescope at Akeno Observatory,Yamanashi, Japan.
The observation started on 12:20:56 UT which corresponds to 103 sec after the trigger. We did not find any new point source within the enhanced XRT circle D’Ai et al., GCN #23769; A.P. Beardmore et al., GCN #23771) in all three bands.
We obtained following 5 sigma limits for the magnitudes.
```
T0+[sec]    MID-UT      T-EXP[sec]    g'       Rc        Ic
-------------------------------------------------------------------------------------------------------
103  12:25:31    540    >18.2     >17.8     >17.0
723  12:35:51    540    >17.9     >17.7     >17.6
1,764  14:21:35    10,800    >18.4     >18.2     >17.4
-------------------------------------------------------------------------------------------------------
T0+ : Elapsed time after the burst
T-EXP: Total Exposure time
```
We used UCAC-4 catalog for flux calibration.
GCN Circular #23780
A. Y. Lien (GSFC/UMBC), S. D. Barthelmy (GSFC), J. R. Cummings (CPI), A. D'Ai (INAF-IASFPA), H. A. Krimm (NSF/USRA), C. B. Markwardt (GSFC), D. M. Palmer (LANL), T. Sakamoto (AGU), M. Stamatikos (OSU), T. N. Ukwatta (LANL) (i.e. the Swift-BAT team):
Using the data set from T-239 to T+963 sec from the recent telemetry downlink, we report further analysis of BAT GRB 190123A (trigger #885314) (D'Ai, et al., GCN Circ. 23769). The BAT ground-calculated position is RA, Dec = 53.175, 45.505 deg, which is
```
   RA(J2000)  =  03h 32m 42.0s
   Dec(J2000) = +45d 30' 16.3"
```
with an uncertainty of 1.7 arcmin, (radius, sys+stat, 90% containment). The partial coding was 64%.
The mask-weighted light curve shows a single FRED-shaped peak from about T-5 to T+20 sec, with a peak around T+3 sec. Observations were discontinued due to an observing constraint at ~T+325 sec. T90 (15-350 keV) is 24.4 +- 4.3 sec (estimated error including systematics).
The time-averaged spectrum from T-1.22 to T+28.06 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.13 +- 0.23. The fluence in the 15-150 keV band is 8.4 +- 1.1 x 10^-7 erg/cm2. The 1-sec peak photon flux measured from T+4.82 sec in the 15-150 keV band is 1.0 +- 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/885314/BA/
GCN Circular #23781
Alan M. Watson (UNAM), Nat Butler (ASU), Rosa L. Becerra (UNAM), Diego Gonz�lez (UNAM), William H. Lee (UNAM), Margarita Pereyra (UNAM), Carlos Rom�n-Z��iga (UNAM), Alexander Kutyrev (GSFC), and Eleonora Troja (GSFC) report:
We observed the field of GRB 190123A (D'Ai et al., GCN Circ. 23769) with the COATLI 50-cm telescope and interim imager at the Observatorio Astron�mico Nacional on the Sierra de San Pedro M�rtir (http://coatli.astroscu.unam.mx) from 2019-01-24 02:30 to 2019-01-23 10:56 (from 14.2 to 22.6 hours after the trigger), obtaining a total of 6.7 hours of exposure in the w filter.
We do not detect a source at the enhanced XRT position (Beardmore et al., GCN Circ. 23771) to a 5-sigma upper limit of w > 22.9.
Our w magnitudes are calibrated against the USNO-B1 catalog (adjusted to an approximate AB system) and are not corrected for Galactic extinction in the direction of the GRB.
Our deeper non-detection follows non-detections reported by Lipunov et al. (GCN Circ. 23770), Hu et al. (GCN Circ. 23772), Steeghs et al. (GCN Circ. 23774), and Shiraishi et al.(GCN Circ. 23778).
We thank the COATLI technical team and the staff of the Observatorio Astron�mico Nacional.
GCN Circular #23784
M. H. Siegel (PSU) and A. D'Ai (INAF-IASFPA) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 190123A 124 s after the BAT trigger (D'Ai et al., GCN Circ. 23769). No optical afterglow consistent with the XRT position (Beardmore et al. GCN Circ. 23771) is detected in the initial UVOT exposures. Preliminary 3-sigma upper limits using the UVOT photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the first finding chart (FC) exposure and subsequent exposures are:
```
Filter         T_start(s)   T_stop(s)      Exp(s)         Mag

white_FC           124          250          123         >20.3
white              124        10248         1258         >22.0
v                 3470        11721          947         >20.3
b                 4290         5926          393         >21.1
u                 4085         5721          393         >21.0
w1                3880         5516          393         >20.1
m2                3675         5310          393         >19.9
w2                4701        11151         1079         >21.1
```
The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.44 in the direction of the burst (Schlegel et al. 1998).
GCN Circular #23786
M. Nakamura, T. Sakamoto (AGU)
We observed the field of GRB 190123A detected by Swift (D'Ai et al., GCN Circ. 23769) with the 14-inch AGU Robotic Optical Monitor for Astrophysical object - Narrow (AROMA-N) located at the Sagamihara campus of Aoyama Gakuin University.
30 images of 60 sec exposures were taken in the R filter starting from January 23 12:21:49 (UT) about 156 seconds after the trigger and stopped on January 23 12:58:25 (UT). We do not detect the optical afterglow both in the individual images and the stacked image. The estimated five sigma upper limit of the combined image (total exposure of 1800 sec) is ~17.7 mag using the USNO-B1 catalog.
GCN Circular #23788
D. Xu, Z.P. Zhu (NAOC) report on behalf of a larger collaboration
We observed the field of GRB 190123A (D'Ai et al., GCN Circ. 23769) with the robotic NEXT-0.6m telescope located at Nanshan, Xinjiang, China. We obtained 3x40s, 4x60s, 3x90s R-band frames, starting at 12:20:56 UT on 2019-01-23, i.e., 103 sec after the BAT trigger.
No optical afterglow consistent with the XRT position (Beardmore et al. GCN Circ. 23771) is detected in the stacked image, download a limiting magnitude of R~19.5, calibrated with the USNO-B1 catalog.
GCN Circular #23789
A. Volnova (IKI), A. Pozanenko (IKI), E. Mazaeva (IKI), E. Klunko (ISTP), A. Kusakin (FAPHI), I. Reva (FAPHI), R. Inasaridze (AAO), A. Ivanov (KubSU), S. Belkin (IKI) report on behalf of IKI-GRB-FuN:
We observed the field of GRB 190123A (D'Ai et al., GCN 23769) on Jan., 23 with Zeiss-1000 1-m telescope of Tien Shan Astronomical Observatory starting on 13:38:38, with MC 0.25-meter telescope of Kuban State University Astrophysical observatory starting on 15:09:35 UT, with AS-32 (0.7m) telescope of Abastumani Observatory starting on 16:12:18 UT, and with AZT-33IK telescope of Sayan observatory (Mondy) starting on 18:24:05 UT. We took several frames in R band with every listed telescope.
We do not detect any source at the enhanced XRT position (Beardmore et al., GCN 23771) in stacked images of each observatory.
Preliminary photometry of AZT-33IKI observations is based on several nearby USNO-B1.0 stars:
```
Date            UT_start   t-T0            Filter    Exp.   OT   UL(3sigma)
                                    (mid, days)             (s)
2019-01-23 18:24:05   0.28248      R         4980  n/d   22.5
```
Our non-detection is consistent with non-detections reported by Lipunov et al. (GCN 23770), Hu et al. (GCN 23772), Steeghs et al. (GCN 23774), Shiraishi et al.(GCN 23778), Watson et al. (GCN 23781), Siegel et al. (GCN 23784), and Nakamura & Sakamoto (GCN 23786).

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Jochen Greiner, last update: 24-Jan-2019 [Disclaimer]