Gamma-ray Burst 180205A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

none

Results of Observations

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Mon 05 Feb 18 04:25:52 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      48
TRIGGER_NUM:     539497530
GRB_RA:           99.517d {+06h 38m 04s} (J2000),
                  99.957d {+06h 39m 50s} (current),
                  98.297d {+06h 33m 11s} (1950)
GRB_DEC:         +64.567d {+64d 34' 00"} (J2000),
                 +64.550d {+64d 32' 59"} (current),
                 +64.610d {+64d 36' 35"} (1950)
GRB_ERROR:       19.87 [deg radius, statistical plus systematic]
GRB_INTEN:       123 [cnts/sec]
DATA_SIGNIF:     4.60 [sigma]
INTEG_TIME:      4.096 [sec]
GRB_DATE:        18154 TJD;    36 DOY;   18/02/05
GRB_TIME:        15925.39 SOD {04:25:25.39} UT
GRB_PHI:         190.00 [deg]
GRB_THETA:       150.00 [deg]
DATA_TIME_SCALE: 4.0960 [sec]
HARD_RATIO:      2.54
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      69%  GRB
2nd_MOST_LIKELY:  29%  Generic SGR
DETECTORS:       0,0,0, 0,0,0, 0,0,1, 0,0,1, 0,0,
SUN_POSTN:       318.77d {+21h 15m 05s}  -15.95d {-15d 56' 43"}
SUN_DIST:        124.75 [deg]   Sun_angle= -9.4 [hr] (East of Sun)
MOON_POSTN:      197.71d {+13h 10m 50s}   -2.47d {-02d 27' 58"}
MOON_DIST:        95.55 [deg]
MOON_ILLUM:      74 [%]
GAL_COORDS:      150.67, 22.92 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       95.42, 41.31 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2018/bn180205184/quicklook/glg_lc_medres34_bn180205184.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 265.62,-24.10 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Mon 05 Feb 18 04:26:02 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      57
TRIGGER_NUM:     539497530
GRB_RA:          134.430d {+08h 57m 43s} (J2000),
                 134.673d {+08h 58m 41s} (current),
                 133.759d {+08h 55m 02s} (1950)
GRB_DEC:          +8.640d {+08d 38' 24"} (J2000),
                  +8.569d {+08d 34' 10"} (current),
                  +8.834d {+08d 50' 01"} (1950)
GRB_ERROR:       8.68 [deg radius, statistical only]
DATA_SIGNIF:     9.50 [sigma]
DATA_INTERVAL:   1.024 [sec]
GRB_DATE:        18154 TJD;    36 DOY;   18/02/05
GRB_TIME:        15925.39 SOD {04:25:25.39} UT
GRB_PHI:         186.00 [deg]
GRB_THETA:        89.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   4153 (Gnd S/W Version number)
SUN_POSTN:       318.77d {+21h 15m 05s}  -15.95d {-15d 56' 42"}
SUN_DIST:        171.61 [deg]   Sun_angle= -11.7 [hr] (East of Sun)
MOON_POSTN:      197.71d {+13h 10m 50s}   -2.47d {-02d 28' 00"}
MOON_DIST:        63.80 [deg]
MOON_ILLUM:      74 [%]
GAL_COORDS:      219.86, 31.95 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      134.37, -8.22 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2018/bn180205184/quicklook/glg_lc_medres34_bn180205184.gif
POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_539497530.fits
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        The LC_URL file will not be created/available until ~15 min after the trigger.  
COMMENTS:        The POS_MAP_URL file will not be created/available until ~1.5 min after the notice.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Mon 05 Feb 18 04:27:12 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      0
TRIGGER_NUM:     539497530
GRB_RA:          122.800d {+08h 11m 12s} (J2000),
                 123.061d {+08h 12m 15s} (current),
                 122.079d {+08h 08m 19s} (1950)
GRB_DEC:         +18.890d {+18d 53' 24"} (J2000),
                 +18.835d {+18d 50' 07"} (current),
                 +19.039d {+19d 02' 22"} (1950)
GRB_ERROR:       4.65 [deg radius, statistical only]
DATA_SIGNIF:     12.20 [sigma]
DATA_INTERVAL:   11.264 [sec]
GRB_DATE:        18154 TJD;    36 DOY;   18/02/05
GRB_TIME:        15925.39 SOD {04:25:25.39} UT
GRB_PHI:         194.00 [deg]
GRB_THETA:       102.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   41531 (Gnd S/W Version number)
SUN_POSTN:       318.77d {+21h 15m 05s}  -15.95d {-15d 56' 42"}
SUN_DIST:        164.74 [deg]   Sun_angle= -11.0 [hr] (East of Sun)
MOON_POSTN:      197.72d {+13h 10m 52s}   -2.47d {-02d 28' 13"}
MOON_DIST:        76.33 [deg]
MOON_ILLUM:      74 [%]
GAL_COORDS:      203.92, 25.77 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      120.84, -1.11 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2018/bn180205184/quicklook/glg_lc_medres34_bn180205184.gif
POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_539497530.fits
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        The LC_URL file will not be created/available until ~15 min after the trigger.  
COMMENTS:        The POS_MAP_URL file will not be created/available until ~1.5 min after the notice.

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 05 Feb 18 04:28:55 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     808625,   Seg_Num: 0
GRB_RA:          126.8206d {+08h 27m 16.94s} (J2000),
                 127.0689d {+08h 28m 16.52s} (current),
                 126.1340d {+08h 24m 32.16s} (1950)
GRB_DEC:         +11.5419d {+11d 32' 30.8"} (J2000),
                 +11.4813d {+11d 28' 52.8"} (current),
                 +11.7074d {+11d 42' 26.6"} (1950)
GRB_ERROR:       5.6 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       9.50e-10 [erg/cm2/sec]
GRB_SIGNIF:      6.32 [sigma]
IMG_START_DATE:  18154 TJD;    36 DOY;   18/02/05
IMG_START_TIME:  16103.69 SOD {04:28:23.69} UT,   6727.0 [sec] since BAT Trigger Time
TAM[0-3]:        327.69 237.16 261.70 243.65
AMPLIFIER:       2
WAVEFORM:        134
SUN_POSTN:       318.77d {+21h 15m 05s}  -15.94d {-15d 56' 40"}
SUN_DIST:        167.79 [deg]   Sun_angle= -11.2 [hr] (East of Sun)
MOON_POSTN:      197.73d {+13h 10m 56s}   -2.48d {-02d 28' 32"}
MOON_DIST:        71.60 [deg]
MOON_ILLUM:      74 [%]
GAL_COORDS:      213.15, 26.45 [deg] galactic lon,lat of the burst
ECL_COORDS:      126.31, -7.38 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Coordinates.  
COMMENTS:           
COMMENTS:        WARNING: No BAT_Position TDRSS message was received for this trigger_number!  
COMMENTS:           
COMMENTS:        WARNING: The centroided position is more than 100 rows or columns from the center of the FOV.

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 05 Feb 18 04:29:06 UT
NOTICE_TYPE:     Swift-XRT Image
TRIGGER_NUM:     808625,   Seg_Num: 0
GRB_RA:          126.8206d {+08h 27m 16.9s} (J2000),
                 127.0689d {+08h 28m 16.5s} (current),
                 126.1340d {+08h 24m 32.1s} (1950)
GRB_DEC:         +11.5419d {+11d 32' 30.8"} (J2000),
                 +11.4813d {+11d 28' 52.8"} (current),
                 +11.7074d {+11d 42' 26.6"} (1950)
GRB_ERROR:       5.4 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       40 [cnts]
IMG_START_DATE:  18154 TJD;    36 DOY;   18/02/05
IMG_START_TIME:  16103.69 SOD {04:28:23.69} UT,   6727.0 [sec] since BAT Trigger Time
CENTROID_X:      274.38,  raw= 274  [pixels]
CENTROID_Y:      414.09,  raw= 414  [pixels]
ROLL:            247.88 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   272.73
GRB_POS_XRT_Z:   -75.46
IMAGE_URL:       sw00808625000msxps_rw.img
SUN_POSTN:       318.77d {+21h 15m 05s}  -15.94d {-15d 56' 40"}
SUN_DIST:        167.79 [deg]   Sun_angle= -11.2 [hr] (East of Sun)
MOON_POSTN:      197.73d {+13h 10m 56s}   -2.48d {-02d 28' 34"}
MOON_DIST:        71.61 [deg]
MOON_ILLUM:      74 [%]
GAL_COORDS:      213.15, 26.45 [deg] galactic lon,lat of the burst
ECL_COORDS:      126.31, -7.38 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Image.  
COMMENTS:        WARNING: The centroided position is more than 100 rows or columns from the center of the FOV.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 05 Feb 18 04:29:14 UT
NOTICE_TYPE:     Swift-XRT Processed Image
TRIGGER_NUM:     808625,   Seg_Num: 0
GRB_RA:          126.8206d {+08h 27m 16.9s} (J2000),
                 127.0689d {+08h 28m 16.5s} (current),
                 126.1340d {+08h 24m 32.1s} (1950)
GRB_DEC:         +11.5419d {+11d 32' 30.8"} (J2000),
                 +11.4813d {+11d 28' 52.8"} (current),
                 +11.7074d {+11d 42' 26.6"} (1950)
GRB_ERROR:       5.4 [arcsec, radius, statistical plus systematic]
GRB_INTEN:       40 [cnts]
IMG_START_DATE:  18154 TJD;    36 DOY;   18/02/05
IMG_START_TIME:  16103.69 SOD {04:28:23.69} UT,   6727.0 [sec] since BAT Trigger Time
CENTROID_X:      274.38,  raw= 274  [pixels]
CENTROID_Y:      414.09,  raw= 414  [pixels]
ROLL:            247.88 [deg]
GAIN:            1
MODE:            3, Long Image mode
WAVEFORM:        134
EXPO_TIME:       2.50 [sec]
GRB_POS_XRT_Y:   272.73
GRB_POS_XRT_Z:   -75.46
IMAGE_URL:       sw00808625000msxps_rw.img
SUN_POSTN:       318.77d {+21h 15m 05s}  -15.94d {-15d 56' 40"}
SUN_DIST:        167.79 [deg]   Sun_angle= -11.2 [hr] (East of Sun)
MOON_POSTN:      197.74d {+13h 10m 56s}   -2.48d {-02d 28' 36"}
MOON_DIST:        71.61 [deg]
MOON_ILLUM:      74 [%]
GAL_COORDS:      213.15, 26.45 [deg] galactic lon,lat of the burst
ECL_COORDS:      126.31, -7.38 [deg] ecliptic lon,lat of the burst
COMMENTS:        SWIFT-XRT Processed Image.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 05 Feb 18 04:31:27 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     808625,   Seg_Num: 0
POINT_RA:        126.811d {+08h 27m 15s} (J2000)
POINT_DEC:       +11.620d {+11d 37' 12"} (J2000)
POINT_ROLL:      247.881d
IMG_START_DATE:  18154 TJD;    36 DOY;   18/02/05
IMG_START_TIME:  16110.79 SOD {04:28:30.79} UT,   6734.1 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.540
N_STARS:         58
X_OFFSET:        448 [pixels]
Y_OFFSET:        0 [pixels]
X_MAX:           1407 [pixels]
Y_MAX:           959 [pixels]
DET_THRESH:      13
PHOTO_THRESH:    7
SL_URL:          sw00808625000msufc93134.fits
SUN_POSTN:       318.77d {+21h 15m 06s}  -15.94d {-15d 56' 38"}
SUN_DIST:        167.81 [deg]   Sun_angle= -11.2 [hr] (East of Sun)
MOON_POSTN:      197.75d {+13h 11m 01s}   -2.48d {-02d 29' 01"}
MOON_DIST:        71.65 [deg]
MOON_ILLUM:      74 [%]
GAL_COORDS:      213.06, 26.47 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      126.28, -7.30 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 05 Feb 18 04:31:43 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     808625,   Seg_Num: 0
POINT_RA:        126.811d {+08h 27m 15s} (J2000)
POINT_DEC:       +11.620d {+11d 37' 12"} (J2000)
POINT_ROLL:      247.881d
IMG_START_DATE:  18154 TJD;    36 DOY;   18/02/05
IMG_START_TIME:  16110.79 SOD {04:28:30.79} UT,   6734.1 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.540
N_STARS:         58
X_OFFSET:        448 [pixels]
Y_OFFSET:        0 [pixels]
X_MAX:           1407 [pixels]
Y_MAX:           959 [pixels]
DET_THRESH:      13
PHOTO_THRESH:    7
SL_URL:          sw00808625000msufc93134.fits
SUN_POSTN:       318.77d {+21h 15m 06s}  -15.94d {-15d 56' 38"}
SUN_DIST:        167.81 [deg]   Sun_angle= -11.2 [hr] (East of Sun)
MOON_POSTN:      197.76d {+13h 11m 02s}   -2.48d {-02d 29' 04"}
MOON_DIST:        71.65 [deg]
MOON_ILLUM:      74 [%]
GAL_COORDS:      213.06, 26.47 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      126.28, -7.30 [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:     Mon 05 Feb 18 04:32:55 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     808625,   Seg_Num: 0
POINT_RA:        126.811d {+08h 27m 15s} (J2000)
POINT_DEC:       +11.620d {+11d 37' 12"} (J2000)
ROLL:            247.881d
IMG_START_DATE:  18154 TJD;    36 DOY;   18/02/05
IMG_START_TIME:  16110.79 SOD {04:28:30.79} UT,   6734.1 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     539497731
X_OFFSET:        670 [pixels]
Y_OFFSET:        320 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       830
Y_GRB_POS:       480
BINNING_INDEX:   1
IM_URL:          sw00808625000msuni93155.fits
SUN_POSTN:       318.78d {+21h 15m 06s}  -15.94d {-15d 56' 37"}
SUN_DIST:        167.81 [deg]   Sun_angle= -11.2 [hr] (East of Sun)
MOON_POSTN:      197.77d {+13h 11m 04s}   -2.49d {-02d 29' 17"}
MOON_DIST:        71.66 [deg]
MOON_ILLUM:      74 [%]
GAL_COORDS:      213.06, 26.47 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      126.28, -7.30 [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:     Mon 05 Feb 18 04:33:11 UT
NOTICE_TYPE:     Swift-UVOT Processed Image
TRIGGER_NUM:     808625,   Seg_Num: 0
POINT_RA:        126.811d {+08h 27m 15s} (J2000)
POINT_DEC:       +11.620d {+11d 37' 12"} (J2000)
ROLL:            247.881d
IMG_START_DATE:  18154 TJD;    36 DOY;   18/02/05
IMG_START_TIME:  16110.79 SOD {04:28:30.79} UT,   6734.1 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     539497731
X_OFFSET:        670 [pixels]
Y_OFFSET:        320 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       830
Y_GRB_POS:       480
BINNING_INDEX:   1
IM_URL:          sw00808625000msuni93155.fits
SUN_POSTN:       318.78d {+21h 15m 06s}  -15.94d {-15d 56' 37"}
SUN_DIST:        167.81 [deg]   Sun_angle= -11.2 [hr] (East of Sun)
MOON_POSTN:      197.77d {+13h 11m 05s}   -2.49d {-02d 29' 20"}
MOON_DIST:        71.66 [deg]
MOON_ILLUM:      74 [%]
GAL_COORDS:      213.06, 26.47 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      126.28, -7.30 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Image.  
COMMENTS:        The GRB Position came from the XRT Position Command.  
COMMENTS:        The image has 2x2 binning (compression).  
COMMENTS:        All 4 attachments are included.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 05 Feb 18 04:35:32 UT
NOTICE_TYPE:     Swift-UVOT Position
TRIGGER_NUM:     808625,   Seg_Num: 0
GRB_RA:          126.8196d {+08h 27m 16.70s} (J2000),
                 127.0679d {+08h 28m 16.28s} (current),
                 126.1330d {+08h 24m 31.92s} (1950)
GRB_DEC:         +11.5418d {+11d 32' 30.4"} (J2000),
                 +11.4812d {+11d 28' 52.4"} (current),
                 +11.7073d {+11d 42' 26.3"} (1950)
GRB_ERROR:       0.6 [arcsec radius, statistical only]
GRB_MAG:         15.64 +/- 0.14 [mag]
FILTER:          10, White
IMG_START_DATE:  18154 TJD;    36 DOY;   18/02/05
IMG_START_TIME:  16107.00 SOD {04:28:27.00} UT,   6730.3 [sec] since BAT Trigger Time
SUN_POSTN:       318.78d {+21h 15m 06s}  -15.94d {-15d 56' 35"}
SUN_DIST:        167.79 [deg]   Sun_angle= -11.2 [hr] (East of Sun)
MOON_POSTN:      197.79d {+13h 11m 10s}   -2.50d {-02d 29' 46"}
MOON_DIST:        71.67 [deg]
MOON_ILLUM:      74 [%]
GAL_COORDS:      213.15, 26.45 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      126.30, -7.38 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT UVOT Position Notice.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        The UVOT position is 3.2 arcsec from the XRT position.  
COMMENTS:        Result based on Genie data.  
COMMENTS:        Notice generated automatically.

GCN Circular #22381
P. A. Evans (U Leicester), J. A. Kennea (PSU), K. L. Page (U Leicester) and D. M. Palmer (LANL) report on behalf of the Neil Gehrels Swift Observatory Team:
BAT has detected GRB 180205A (trigger #808625), leading to a slew and follow-up observations by Swift. However, due to missing telemetry packets, no further BAT information is available at this time.
The XRT began observing the field at 04:28:23.6 UT. XRT found a bright, uncatalogued X-ray source located at RA, Dec 126.8206, 11.5419 which is equivalent to:
```
   RA(J2000)  = +08h 27m 16.94s
   Dec(J2000) = +11d 32' 30.8"
```
with an uncertainty of 5.6 arcseconds (radius, 90% containment). No event data are yet available to determine the column density using X-ray spectroscopy.
The initial flux in the 2.5 s image was 9.50e-10 erg cm^-2 s^-1 (0.2-10 keV).
UVOT took a finding chart exposure of 150 seconds with the White filter at 04:28:30.79 UT. There is a candidate afterglow in the rapidly available 2.7'x2.7' sub-image at
```
  RA(J2000)  =	08:27:16.73 = 126.81970
  DEC(J2000) = +11:32:30.7  =  11.54185
```
with a 90%-confidence error radius of about 0.61 arc sec. This position is 3.2 arc sec. from the center of the XRT error circle. The estimated magnitude is 15.65 with a 1-sigma error of about 0.14. No correction has been made for the expected extinction corresponding to E(B-V) of 0.03.
Burst Advocate for this burst is P. A. Evans (pae9 AT star.le.ac.uk). Please contact the BA by email if you require additional information regarding Swift followup of this burst. In extremely urgent cases, after trying the Burst Advocate, you can contact the Swift PI by phone (see Swift TOO web site for information: http://www.swift.psu.edu/too.html.)
GCN Circular #22382
WeiKang Zheng and Alex Filippenko (UC Berkeley) report on behalf of the KAIT GRB team:
The 0.76-m Katzman Automatic Imaging Telescope (KAIT), located at Lick Observatory, responded to Swift GRB 180205A (Evans, et al.,GCN 22381), starting at 04:31:40 UT immediately after receiving the trigger. Observations were performed with an automatic sequence in the clear (roughly R), V, and I filters, and the exposure time was 20 s per imag. We detect the bright optical afterglow reported by UVOT (Evans, et al.,GCN 22381). It faded from clear ~15.6 mag from our first clear band image to ~16.8 mag 22.5 minutes later, we therefore confirm it to be the optical afterglow of GRB 180205A.
GCN Circular #22383
J. Bolmer (ESO/MPE) and D.A. Kann (HETH/IAA-CSIC) report:
We observed the field of GRB 180205A (Swift trigger 808625; P.A. Evans et al., GCN 22381) simultaneously in g'r'i'z'JHK with GROND (Greiner et al. 2008, PASP 120, 405) mounted at the 2.2 m MPG telescope at ESO La Silla Observatory (Chile).
Observations started at 04:38 UT on February 05, 2018, 13 minutes after the GRB trigger. They were performed at an average seeing of 1".1 and at an average airmass of 1.33.
We clearly detect the NIR/optical transient of GRB 181205A reported also by Zheng et al., GCN 22382.
Based on total exposures of 200 seconds in g=E2=80=99r'i'z=E2=80=99 and 180 seconds in JHK at a midtime of 04:43 UT, 17 minutes after the burst, we measure the following preliminary magnitudes (AB magnitude system):
```
g' = 16.83 +/- 0.01 mag,
r' = 16.68 +/- 0.01 mag,
i' = 16.56 +/- 0.01 mag,
z' = 16.38 +/- 0.01 mag,
J  = 16.22 +/- 0.02 mag,
H  = 16.05 +/- 0.02 mag, and
K  = 16.08 +/- 0.14 mag.
```
Magnitudes and are calibrated against PanSTARRS and 2MASS field stars and are not corrected for the Galactic foreground extinction corresponding to a reddening of E_(B-V)=3D 0.03 mag in the direction of the burst (Schlegel et al. 1998).
Observations are continuing.
We thank Markus Rabus for the excellent support from La Silla.
GCN Circular #22384
N. R. Tanvir (U. Leicester), K. E. Heintz (U. Iceland, DARK/NBI), J. Selsing (DARK/NBI), J. Japelj (API, U. Amsterdam), J. Bolmer (ESO/MPE), D. A. Kann (HETH/IAA-CSIC), D. Xu (NAOC), A. de Ugarte Postigo (HETH/IAA-CSIC and DARK/NBI), D. Malesani (DARK/NBI), J. P. U. Fynbo (NBI), G. Pugliese (API, U. Amsterdam) report on behalf of the STARGATE Consortium:
We observed the bright optical counterpart of the Swift GRB 180205A (Evans et al. GCN 22381; Zheng et al. GCN 22382; Bolmer et al. GCN 22383) with the ESO Very Large Telescope UT 2 (Kueyen) equipped with the X-shooter spectrograph, covering the wavelength range 3500-24000 AA. Observations started on February 05.25 UT (approx 1.5 hr after the GRB) and consisted of 4 exposures of 600 s each.
The spectrum exhibits many absorption features including C II, Si II, Si II*, Al II, Fe II, Mg II, Mg I at a common redshift of z=1.409. We conclude this is the redshift of the GRB.
We acknowledge the expert support from the ESO observing staff, in particular Jesus Corral-Santana and Cedric Ledoux.
GCN Circular #22386
A. von Kienlin (MPE) reports on behalf of the Fermi GBM Team:
"At 04:25:25.39 UT on 05 February 2018, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 180205A (trigger 539497530 / 180205184), which was also detected by the Swift/BAT (Evans et al. 2008, GCN 22381) The GBM on-ground location is consistent with the Swift position.
The angle from the Fermi LAT boresight at the GBM trigger time is 94 degrees.
The GBM light curve shows several pulses with a duration (T90) of about 15 s (50-300 keV). The GBM detectors were turned off for SAA entry about 70 seconds after the trigger. The time-averaged spectrum from T0-2.048 s to T0+9.216 s is well fit by a power law function with an exponential high-energy cutoff. The power law index is -1.38 +/- 0.15 and the cutoff energy, parameterized as Epeak, is 85.0 +/- 14.4 keV
The event fluence (10-1000 keV) in this time interval is (1.5 +/- 1.4)E-06 erg/cm^2. The 1.024-sec peak photon flux measured starting from T0+3.71204 s in the 10-1000 keV band is 4.7 +/- 0.3 ph/s/cm^2.
The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog."
GCN Circular #22387
A. Volnova (IKI), A. Pozanenko (IKI), E. Klunko (ISTP), E. Mazaeva (IKI) report on behalf of of larger GRB follow-up collaboration:
We observed the field of GRB 180205A (Evans et al., GCN 22381) with AZT-33IK telescope of Sayan observatory (Mondy). We took several images in R-filter starting on Feb. 05 (UT) 12:54:29. The afterglow of GRB 180205A (Evans et al., GCN 22381; Zheng et al., GCN 22382; Bolmer et al., GCN 22383) is clearly detected in a stacked image. Preliminary photometry is following.
```
Date        UT start  t-T0      Filter Exp.   OT      Err.  UL
                      (mid, days)    (s)

2018-02-05  12:54:29  0.372*    R      30*120 19.47   0.07  21.8
```
* The time after XRT observation start at (UT) 04:28:23.69.
The photometry is based on several nearby SDSS DR9 stars
```
SDSS_id                 R_Lupton
J082719.98+113324.0	16.206	0.013
J082717.26+113400.0	16.092	0.013
J082715.06+113230.6	15.553	0.013
```
GCN Circular #22388
K. Wiersema (Warwick) & S. Covino (INAF / OAB) report on behalf of the Stargate consortium:
We observed the afterglow of GRB 180205A (Evans et al. GCN 22381; Zheng et al. GCN 22382; Bolmer et al. GCN 22383, Tanvir et al. GCN 22384) with the ESO Very Large Telescope equipped with FORS2. We obtained a set of imaging polarimetry observations in R band, starting at 07:07 UT (approximately 2.67 hours after burst). Using archival calibration data, we find a low level of polarisation, P ~ 0.9%, similar to the majority of late-time GRB afterglow measurements (Covino & Gotz 2016, A&AT 29, 205).
We acknowledge excellent support from the ESO staff.
GCN Circular #22390
Edward Falcon, Sameen Yunus, WeiKang Zheng and Alex Filippenko (UC Berkeley) report on behalf of the KAIT GRB team:
We observed the field of GRB 180205A (Evans et al., GCN 22381) with the 1-m Nickel telescope located at Lick observatory, California. Observations started about 1.32 hours after the burst and lasted for ~1.4 hours. We detected the optical afterglow (Evans et al. GCN 22381; Zheng et al. GCN 22382; Bolmer et al. GCN 22383; Tanvir et al. GCN 22384; Volnova et al. GCN 22387) in all the images taken with B,V,R and I filters. A preliminary light curve is posted at the following link along with KAIT observations (Zheng et al. GCN 22382): http://astro.berkeley.edu/~zwk/grb/GRB180205A/GRB180205A_nickel_kait.png
GCN Circular #22391
J. Bolmer (ESO/MPE) and D.A. Kann (HETH/IAA-CSIC) report:
We once more observed the field of GRB 180205A (Swift trigger 808625; P.A. Evans et al., GCN 22381) simultaneously in g'r'i'z'JHK with GROND (Greiner et al. 2008, PASP 120, 405) mounted at the 2.2 m MPG telescope at ESO La Silla Observatory (Chile).
Observations started at 01:28 UT on February 06, 2018, 0.8765 days after the GRB trigger. They were performed at an average seeing of 1".1 and at an average airmass of 1.68.
Based on total exposures of 1320 seconds in g'r'i'z' and 1200 seconds in JHK at a midtime of 01:40 UT, 0.8854 days after the burst, we measure the following preliminary magnitudes (AB magnitude system):
```
g' = 20.29 +/- 0.03 mag,
r' = 20.03 +/- 0.03 mag,
i' = 19.81 +/- 0.03 mag,
z' = 19.66 +/- 0.03 mag,
J  = 19.47 +/- 0.12 mag,
H  = 19.16 +/- 0.19 mag, and
K  > 17.6 mag.
```
These magnitudes are significantly brighter than the extrapolation of our GROND data from the first night (Bolmer & Kann, GCN 22383). We point out that the Nickel/KAIT light curve (E. Falcon, GCN 22390) shows a plateau phase setting in beyond 10ks, at a time we were not able to observe with GROND anymore. This plateau would explain why the afterglow remains bright.
Magnitudes and are calibrated against SDSS and 2MASS field stars and are not corrected for the Galactic foreground extinction corresponding to a reddening of E_(B-V)= 0.03 mag in the direction of the burst (Schlegel et al. 1998).
Further observations are encouraged.
We thank Markus Rabus for the excellent support from La Silla.
GCN Circular #22392
L. P. Xin, F. Q. Pi, J. Y. Wei, Y. L. Qiu, J. S. Deng, J. Wang, X. H. Han, X. M. Meng, C. Wu, D. TURPIN, H. L. Li report:
We began to observe GRB 180205A (Evens et al., GCN 22381) with Xinglong 0.8-m TNT telescope, China, at 2018-02-05, 16:11:42(UT), about 12.6 hours the burst.
We obtained several R-band images with an exposure time of 300 sec for each frame. The optical afterglow (Evens et al., GCN 22381; Zheng et al., GCN 22382; Bolmer et al., GCN 22383, 22391; Tanvir et al., GCN 22384; Volnova et al., GCN 22387, Wiersema et al., GCN 22388; Falcon et al., 22390 ) is clearly detected in our stacked image with 5*300 sec. The brightness is estimated to be about R~19.97 mag calibrated by USNO B1.0 R2 mag at about 12.7 hours after the burst,
We acknowledge the excellent support from Xinglong staff Miao Zhang.
GCN Circular #22393
H. A. Krimm (NSF/USRA), S. D. Barthelmy (GSFC), J. R. Cummings (CPI), P. A. Evans (U Leicester), A. Y. Lien (GSFC/UMBC), C. B. Markwardt (GSFC), D. M. Palmer (LANL), T. Sakamoto (AGU), M. Stamatikos (OSU), T. N. Ukwatta (LANL) (i.e. the Swift-BAT team):
Using the data set from T-240 to T+700 sec from the recent telemetry downlink, we report further analysis of BAT GRB 180205A (trigger #808625) (Evans et al., GCN Circ. 22381). The BAT ground-calculated position is RA, Dec = 126.819, 11.536 deg which is
```
  RA(J2000)  =  08h 27m 16.5s
  Dec(J2000) = +11d 32' 11.1"
```
with an uncertainty of 1.1 arcmin, (radius, sys+stat, 90% containment). The partial coding was 50%.
The mask-weighted light curve shows a multi-peaked structure that starts at ~T-7 s and ends at ~T+11 s. The two major peaks occur at ~T-5 s and ~T0 s, respectively. T90 (15-350 keV) is 15.5 +- 3.1 sec (estimated error including systematics).
The time-averaged spectrum from T-7.04 to T+10.87 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 2.04 +- 0.13. The fluence in the 15-150 keV band is 1.0 +- 0.1 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T-0.20 sec in the 15-150 keV band is 3.4 +- 0.3 ph/cm2/sec. All the quoted errors are at the 90% confidence level.
The results of the batgrbproduct analysis are available at http://gcn.gsfc.nasa.gov/notices_s/808625/BA/
GCN Circular #22394
K.L. Page (U. Leicester), A.P. Beardmore (U. Leicester), P. D'Avanzo (INAF-OAB), V. D'Elia (ASDC), A. D'Ai (INAF-IASFPA), A. Tohuvavohu (PSU), S. J. LaPorte (PSU), J.A. Kennea (PSU) and P.A. Evans report on behalf of the Swift-XRT team:
We have analysed 5.0 ks of XRT data for GRB 180205A (Evans et al. GCN Circ. 22381), from 180 s to 33.8 ks after the BAT trigger. The data comprise 85 s in Windowed Timing (WT) mode with the remainder in Photon Counting (PC) mode. Using 3849 s of PC mode data and 7 UVOT images, we find an enhanced XRT position (using the XRT-UVOT alignment and matching UVOT field sources to the USNO-B1 catalogue): RA, Dec = 126.81966, +11.54210 which is equivalent to:
```
RA (J2000): 08h 27m 16.72s
Dec(J2000): +11d 32' 31.6"
```
with an uncertainty of 1.5 arcsec (radius, 90% confidence).
The light curve can be modelled with an initial power-law decay with an index of alpha=4.8 (+0.6, -0.5), followed by a break at T+279 s to an alpha of 1.00 (+/-0.04).
A spectrum formed from the WT mode data can be fitted with an absorbed power-law with a photon spectral index of 2.72 (+0.18, -0.17). The best-fitting absorption column is 8.7 (+2.8, -2.5) x 10^21 cm^-2, at a redshift of 1.409, in addition to the Galactic value of 3.4 x 10^20 cm^-2 (Willingale et al. 2013). The PC mode spectrum has a photon index of 1.89 (+0.15, -0.14) and a best-fitting absorption column of 3.1 (+3.0, -2.6) x 10^21 cm^-2. The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 3.5 x 10^-11 (4.0 x 10^-11) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
```
Galactic foreground: 3.4 x 10^20 cm^-2
Intrinsic column:    3.1 (+3.0, -2.6) x 10^21 cm^-2 at z=1.409
Photon index:	     1.89 (+0.15, -0.14)
```
If the light curve continues to decay with a power-law decay index of 1.00, the count rate at T+24 hours will be 0.013 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 4.5 x 10^-13 (5.2 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/00808625.
This circular is an official product of the Swift-XRT team.
GCN Circular #22395
Z.P. Zhu, H.X. Feng, D. Xu (NAOC), B.Y. Yu (HNU), J.H. Liu, X. Zhang, H.B. Niu, S.G. Ma, J.Z. Liu, A. Esamdin, L. Ma, Y. Zhang (XAO) report on behalf of a larger collaboration:
We observed the field of GRB 180205A (Evens et al., GCN 22381) using the 1m telescope located at Nanshan, Xinjiang, China, and 10x60s R-band frames, starting at 16:31:07 UT on 2018-02-05.
The optical afterglow (e.g., Evens et al., GCN 22381; Zheng et al., GCN 22382) is clearly detected in our stacked image.
Preliminary photometry results are as follows:
```
Tmid-T0  Exposure  Filter   Mag   MagErr
  (hr)           (s)
12.15     10x60       R       19.67    0.10
```
Photometry is calibrated with nearby SDSS stars, and errors are only statistical values.
GCN Circular #22396
S.W.K. Emery (UCL-MSSL) and P. A. Evans (U Leicester) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 180205A 182 s after the BAT trigger (Evans et al., GCN Circ. 22381). A fading source consistent with the XRT position (Page et al., GCN Circ. 22394), also detected by (Zheng et al. GCN 22382; Bolmer et al. GCN 22383; Tanvir et al. GCN 22384; Volnova et al. GCN 22387; Falcon et al. GCN 22390; Xin et al. 22392; Zhu et al. GCN 22395) is detected in the initial UVOT exposures.
The preliminary UVOT position is:
```
    RA  (J2000) =  08:27:16.74 = 126.81975 (deg.)
    Dec (J2000) = +11:32:30.9  =  11.54191 (deg.)
```
with an estimated uncertainty of 0.42 arc sec. (radius, 90% confidence).
Preliminary detections using the UVOT photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the first finding chart (FC) exposure and the early exposures are:
```
Filter         T_start(s)   T_stop(s)      Exp(s)           Mag
white_FC           182          331          147         15.75 +/- 0.02
white              540          732           36         16.33 +/- 0.02
v                  158          612           52         16.11 +/- 0.09
b                  515          710           39         16.65 +/- 0.07
u                  490          686           39         16.82 +/- 0.07
uvw1               466          661           39         16.04 +/- 0.10
uvm2               441          636           39         16.32 +/- 0.15
uvw2               391          585           39         17.06 +/- 0.17
```
The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.03 in the direction of the burst (Schlegel et al. 1998).
GCN Circular #22397
Myungshin Im, Changsu Choi, Gregory S. Paek, Sung A O, Sophia Kim (CEOU/SNU), Yuji Urata (NCU), H.-I. Sung (KASI) on behalf of a larger collaboration
We observed the afterglow of GRB 180205A (Evans et al., GCN 22381; Zheng et al. GCN 22382; Bolmer et al. GCN 22383; Tanvir et al. GCN 22384; Volnova et al. GCN 22387; Falcon et al. GCN 22380; Xin et al. 22392; Zhu et al. 22395; Emery et al. 22396) with the 1-m telescope at the Mt. Lemmon Optical Astronomy Observatory (LOAO) and the 0.8m and 0.25 telescopes at the McDonald Observatory. The observation started at about 1 hour after the initial alert, using B, V, R, I, z, and Y filters. The observation continued throughout the night.
We clearly identify the optical afterglow in these bands, and =E2=80=8Ba =E2=80=8B preliminary photometry in R-band shows R ~ 18 mag at 1.3 hours post-burst.
Further observations and analysis are being carried out =E2=80=8B, including telescopes in Korea. Additional =E2=80=8Bresults =E2=80=8B will be reported =E2=80=8B as they become available.
GCN Circular #22398
P.A. Evans (U. Leicester) and D.M. Palmer (LANL) report on behalf of the Swift team:
Due to a telemetry gap, the trigger time of GRB 180205A was not reported in the early GCN Circulars.
The BAT trigger time was 04:25:29.3 (on 2018 Feb 5). We apologise for any inconvenience caused by the omission.
This circular is an official product of the Swift team.
GCN Circular #22401
Arto Oksanen (Hankasalmi Obs., Hankasalmi, Finland) and D. Malesani (DARK/NBI) report the following observations of GRB 180205A (Evans et al., GCN 22381):
A. Oksanen observed the location of GRB 180205A using the Hankasalmi Observatory 0.4-m Richey-Chretien telescope with an SBIG STL-1001E camera. Forty 60-second frames were obtained with clear filter between 18:19 UT and 19:41 UT on 2018 February 5.
The afterglow is detected in co-added image.
Photometry of co-added image yields the following:
```
t-t0(d)     m(CR)   err(CR)
0.605       19.43    0.06
```
Photometry was performed using comparison stars from the Pan-STARRS survey (Chambers et al. 2016; arXiv:1612.05560), after adopting the conversion formulae by Lupton (2005).
GCN Circular #22403
E. Mazaeva (IKI), A. Pozanenko (IKI), A. Volnova (IKI), R. Inasaridze (AbAO), V. Ayvazian (AbAO), O. Kvaratskhelia (AbAO), G. Inasaridze (AbAO), I. Molotov (KIAM), report on behalf of larger GRB follow-up collaboration:
We observed the field of GRB 180205A (Evans et al., GCN 22381) with AS-32 (0.7m) telescope of Abastumani Observatory starting on Feb., 06 (UT) 23:53:51. We obtained several unfiltered images starting on Feb. 05 (UT) 12:54:29. The afterglow of GRB 180205A (Evans et al., GCN 22381; Zheng et al. GCN 22382; Bolmer et al. GCN 22383; Tanvir et al. GCN 22384; Volnova et al. GCN 22387; Falcon et al. GCN 22380; Xin et al. 22392; Zhu et al. 22395; Emery et al. 22396; Im et al., GCN 22397) is clearly detected in a stacked image. Preliminary photometry is following.
```
Date        UT start  t-T0      Filter Exp.   OT      Err.  UL
                      (mid, days)    (s)

2018-02-06  17:09:23  1.54515   CR     24*60 20.32   0.10  21.2
```
The photometry is based on several nearby SDSS DR9 stars
```
SDSS_id                R_Lupton
J082719.98+113324.0    16.206    0.013
J082717.26+113400.0    16.092    0.013
J082715.06+113230.6    15.553    0.013
```
GCN Circular #22404
Changsu Choi, Myungshin Im (CEOU/SNU), Tae-Woo Kim, Wonseok Kang (KYSC), on behalf of a larger collaboration.
We observed the field of GRB 180205A (Evans et al., GCN 22381) with the 1m telescope of Deokheung Optical Astronomy Observatory (DOAO) in Korea, starting from 2018/02/05 11:22:11 for three consecutive nights.
We obtained B, V, R-band images and clearly detected the afterglow in a series of 300s exposure images. The afterglow in R band The afterglow is dimming at a rate of about 0.75 mag per day fon average rom 02/05 to 02/07 (Evans et al., GCN 22381; Zheng et al. GCN 22382; Bolmer et al. GCN 22383; Tanvir et al. GCN 22384; Volnova et al. GCN 22387; Falcon et al. GCN 22380; Xin et al. GCN 22392; Zhu et al. GCN 22395; Emery et al. GCN 22396; Im et al., GCN 22397; Oksanen et al. 22401; Mazaeva et al., GCN 22403).
Date UT mid Filter Exp. Mag(Vega) Err
2018-02-05 11:14:41 R 300s 19.47 0.12
2018-02-05 11:56:58 R 300s 19.48 0.08
2018-02-06 12:04:55 R 1200s 20.38 0.05
2018-02-06 14:07:30 R 1200s 20.29 0.04
2018-02-07 12:20:31 R 1200s 20.88 0.06
2018-02-07 13:57:28 R 1200s 21.14 0.07
The photometric calibration is based on the APASS stars within 6' radius from GRB. The observation is continuing.
GCN Circular #22411
A. Volnova (IKI), A. Novichonok (KIAM), A. Pozanenko (IKI), S. Kotov (SAO RAS), T. Movsesyan (BAO), E. Mazaeva (IKI) report on behalf of of larger GRB follow-up collaboration:
We observed the field of GRB 180205A (Evans et al., GCN 22381) with Schmidt-1m telescope of Byurakan Astrophysical Observatory (BAO). We took several images in r (Sloan)-filter starting on Feb. 08 (UT) 12:54:29. The afterglow of GRB 180205A (Evans et al., GCN 22381; Zheng et al. GCN 22382; Bolmer et al. GCN 22383;Tanvir et al. GCN 22384; Volnova et al. GCN 22387; Falcon et al. GCN 22380; Xin et al. GCN 22392; Zhu et al. GCN 22395; Emery et al. GCN 22396; Im et al., GCN 22397; Oksanen et al. 22401; Mazaeva et al., GCN 22403) is clearly detected in a stacked image. Preliminary photometry is following.
```
Date              UT start     t-T0          Filter  Exp.   OT      Err.  UL
                                         (mid, days)        (s)

2018-02-08  18:00:00  3.59550    r     12*300 21.3    0.2  21.9
```
The photometry is based on several nearby SDSS DR9 stars
```
SDSS_id                         r
J082719.98+113324.0 16.357 0.005
J082717.26+113400.0 16.292 0.005
J082715.06+113230.6 15.744 0.004
```
GCN Circular #22414
V. Cunningham (U of Maryland), J. D. Neill (Caltech), S. B. Cenko (NASA GSFC), and R. Walters (Caltech) report on behalf of the SEDM team:
We observed the optical counterpart to GRB 180205A (Evans et al., GCN 22381) with the Spectral Energy Distribution Machine (SEDM) on the 60 inch telescope at Palomar Observatory. The SEDM is a low resolution (R ~ 100) integral field unit spectrometer with a multi-band (ugri) =E2=80=9Crainbow=E2=80=9D camera imager (see Blagorodnova et al., 2017, astro-ph/1710.02917).
The SEDM began observing the optical counterpart at 04:44 UTC (18 minutes after the burst trigger time). We performed 2 x 1350 s exposures over the wavelength range 3800-10600 A. We see no strong evidence for emission or absorption features at the quoted redshift of z=1.409 (Tanvir et al., GCN 22384). The continuum emission is well-fit by a power law spectrum with index alpha =3D 0.67 (f_nu ~ nu^-alpha).
GCN Circular #22430
E. Mazaeva (IKI), A. Volnova (IKI), A. Pozanenko (IKI), E. Klunko (ISTP) report on behalf of of larger GRB follow-up collaboration:
We observed the field of GRB 180205A (Evans et al., GCN 22381) with AZT-33IK telescope of Sayan observatory (Mondy). We obtained several images in R and B-filter on Feb. 05 - Feb. 19. The afterglow of GRB 180205A (Evans et al., GCN 22381; Zheng et al. GCN 22382; Bolmer et al. GCN 22383;Tanvir et al. GCN 22384; Volnova et al. GCN 22387; Falcon et al. GCN 22380; Xin et al. GCN 22392; Zhu et al. GCN 22395; Emery et al. GCN 22396; Im et al., GCN 22397; Oksanen et al. 22401; Mazaeva et al., GCN 22403; Volnova et al., GCN 22411; Cunningham et al., GCN 22414) is detected in stacked images. Preliminary photometry is following.
```
Date        UT start  t-T0      Filter Exp.   OT      Err.  UL
                       (mid, days)    (s)

2018-02-05  15:21:12  0.49438    R      30*120 19.32  0.04  21.9
2018-02-05  16:23:51  0.53094    B      20*120 20.70  0.17  21.3
2018-02-05  20:03:02  0.69011    R      60*60  19.60  0.08  21.7
2018-02-06  16:07:42  1.50850    R      30*120 20.25  0.07  22.0
2018-02-14  15:48:28  9.50557    R      45*120 22.46  0.13  23.9
2018-02-18  13:23:22  13.40481   R      45*120 n/d    n/d   23.0
2018-02-19  14:37:56  14.45658   R      45*120 23.6   0.3   23.6
```
The photometry is based on nearby SDSS DR9 stars
```
SDSS_id                 R_Lupton
J082719.98+113324.0	16.206	0.013
J082717.26+113400.0	16.092	0.013
J082715.06+113230.6	15.553	0.013
```

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Jochen Greiner, last update: 21-Feb-2018 [Disclaimer]