Gamma-ray Burst 200529A

(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:     Fri 29 May 20 00:57:35 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     974942,   Seg_Num: 0
GRB_RA:          238.751d {+15h 55m 00s} (J2000),
                 239.032d {+15h 56m 08s} (current),
                 238.065d {+15h 52m 16s} (1950)
GRB_DEC:         -11.057d {-11d 03' 25"} (J2000),
                 -11.116d {-11d 06' 57"} (current),
                 -10.911d {-10d 54' 40"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       39306 [cnts]    Image_Peak=1352 [image_cnts]
TRIGGER_DUR:     12.160 [sec] 
TRIGGER_INDEX:   478     E_range: 25-100 keV
BKG_INTEN:       177054 [cnts]
BKG_TIME:        3302.97 SOD {00:55:02.97} UT
BKG_DUR:         64 [sec]
GRB_DATE:        18998 TJD;   150 DOY;   20/05/29
GRB_TIME:        3395.77 SOD {00:56:35.77} UT
GRB_PHI:          61.47 [deg]
GRB_THETA:        29.00 [deg]
SOLN_STATUS:     0x20000003
RATE_SIGNIF:     19.26 [sigma]
IMAGE_SIGNIF:    16.33 [sigma]
MERIT_PARAMS:     +1  +0  +0  +4  +2  +4  +0  +0 +97  +0 
SUN_POSTN:        66.38d {+04h 25m 31s}  +21.66d {+21d 39' 40"}
SUN_DIST:        167.32 [deg]   Sun_angle= -11.5 [hr] (East of Sun)
MOON_POSTN:      147.67d {+09h 50m 40s}  +17.67d {+17d 40' 19"}
MOON_DIST:        94.63 [deg]
MOON_ILLUM:      38 [%]
GAL_COORDS:      358.55, 31.37 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      238.96,  9.08 [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 = 40.45,13.14 [deg].  
COMMENTS:           
COMMENTS:        NOTE: This BAT event is temporally(4.0<100sec) coincident with the FERMI_GBM event (trignum=612406604).

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Fri 29 May 20 00:57:20 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      56
TRIGGER_NUM:     612406604
GRB_RA:          234.370d {+15h 37m 29s} (J2000),
                 234.626d {+15h 38m 30s} (current),
                 233.743d {+15h 34m 58s} (1950)
GRB_DEC:          +3.370d {+03d 22' 12"} (J2000),
                  +3.304d {+03d 18' 14"} (current),
                  +3.533d {+03d 32' 00"} (1950)
GRB_ERROR:       10.39 [deg radius, statistical only]
DATA_SIGNIF:     5.40 [sigma]
DATA_INTERVAL:   4.096 [sec]
GRB_DATE:        18998 TJD;   150 DOY;   20/05/29
GRB_TIME:        3399.28 SOD {00:56:39.28} UT
GRB_PHI:         166.00 [deg]
GRB_THETA:        62.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   4173 (Gnd S/W Version number)
SUN_POSTN:        66.38d {+04h 25m 31s}  +21.66d {+21d 39' 40"}
SUN_DIST:        152.51 [deg]   Sun_angle= -11.2 [hr] (East of Sun)
MOON_POSTN:      147.67d {+09h 50m 40s}  +17.67d {+17d 40' 22"}
MOON_DIST:        86.10 [deg]
MOON_ILLUM:      38 [%]
GAL_COORDS:        9.37, 43.80 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      231.11, 22.13 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200529039/quicklook/glg_lc_medres34_bn200529039.gif
POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_612406604.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:     Fri 29 May 20 00:58:06 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      0
TRIGGER_NUM:     612406604
GRB_RA:          242.820d {+16h 11m 17s} (J2000),
                 243.094d {+16h 12m 23s} (current),
                 242.148d {+16h 08m 36s} (1950)
GRB_DEC:          -7.220d {-07d 13' 11"} (J2000),
                  -7.272d {-07d 16' 17"} (current),
                  -7.091d {-07d 05' 28"} (1950)
GRB_ERROR:       6.38 [deg radius, statistical only]
DATA_SIGNIF:     9.80 [sigma]
DATA_INTERVAL:   12.288 [sec]
GRB_DATE:        18998 TJD;   150 DOY;   20/05/29
GRB_TIME:        3399.28 SOD {00:56:39.28} UT
GRB_PHI:         176.00 [deg]
GRB_THETA:        72.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   41731 (Gnd S/W Version number)
SUN_POSTN:        66.38d {+04h 25m 31s}  +21.66d {+21d 39' 40"}
SUN_DIST:        165.27 [deg]   Sun_angle= -11.8 [hr] (East of Sun)
MOON_POSTN:      147.67d {+09h 50m 42s}  +17.67d {+17d 40' 14"}
MOON_DIST:        97.34 [deg]
MOON_ILLUM:      38 [%]
GAL_COORDS:        4.99, 30.71 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      242.21, 13.64 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200529039/quicklook/glg_lc_medres34_bn200529039.gif
POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_612406604.fits
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        This is likely a Long GRB.  
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.  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(4.0<100sec) coincident with the SWIFT_BAT event (trignum=974942).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Fri 29 May 20 00:57:03 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      45
TRIGGER_NUM:     612406604
GRB_RA:          232.000d {+15h 28m 00s} (J2000),
                 232.253d {+15h 29m 01s} (current),
                 231.381d {+15h 25m 32s} (1950)
GRB_DEC:          +5.667d {+05d 40' 00"} (J2000),
                  +5.597d {+05d 35' 49"} (current),
                  +5.839d {+05d 50' 21"} (1950)
GRB_ERROR:       25.93 [deg radius, statistical plus systematic]
GRB_INTEN:       56 [cnts/sec]
DATA_SIGNIF:     4.90 [sigma]
INTEG_TIME:      4.096 [sec]
GRB_DATE:        18998 TJD;   150 DOY;   20/05/29
GRB_TIME:        3399.28 SOD {00:56:39.28} UT
GRB_PHI:         163.00 [deg]
GRB_THETA:        60.00 [deg]
DATA_TIME_SCALE: 4.0960 [sec]
HARD_RATIO:      1.64
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      77%  GRB
2nd_MOST_LIKELY:  12%  Generic SGR
DETECTORS:       0,0,0, 0,0,0, 1,0,0, 1,1,1, 0,0,
SUN_POSTN:        66.38d {+04h 25m 31s}  +21.66d {+21d 39' 40"}
SUN_DIST:        149.43 [deg]   Sun_angle= -11.1 [hr] (East of Sun)
MOON_POSTN:      147.66d {+09h 50m 39s}  +17.67d {+17d 40' 24"}
MOON_DIST:        83.16 [deg]
MOON_ILLUM:      38 [%]
GAL_COORDS:       10.13, 47.05 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      227.99, 23.74 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200529039/quicklook/glg_lc_medres34_bn200529039.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 17.72,19.13 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Fri 29 May 20 01:05:55 UT
NOTICE_TYPE:     Fermi-GBM Final Position
RECORD_NUM:      0
TRIGGER_NUM:     612406604
GRB_RA:          239.230d {+15h 56m 55s} (J2000),
                 239.523d {+15h 58m 06s} (current),
                 238.512d {+15h 54m 03s} (1950)
GRB_DEC:         -18.070d {-18d 04' 11"} (J2000),
                 -18.128d {-18d 07' 39"} (current),
                 -17.926d {-17d 55' 33"} (1950)
GRB_ERROR:       8.53 [deg radius, statistical only]
GRB_DATE:        18998 TJD;   150 DOY;   20/05/29
GRB_TIME:        3399.28 SOD {00:56:39.28} UT
GRB_PHI:         173.00 [deg]
GRB_THETA:        83.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   41731 (Gnd S/W Version number)
SUN_POSTN:        66.38d {+04h 25m 32s}  +21.66d {+21d 39' 43"}
SUN_DIST:        172.65 [deg]   Sun_angle= -11.5 [hr] (East of Sun)
MOON_POSTN:      147.75d {+09h 51m 00s}  +17.65d {+17d 38' 57"}
MOON_DIST:        97.03 [deg]
MOON_ILLUM:      38 [%]
GAL_COORDS:      353.04, 26.25 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      240.87,  2.31 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200529039/quicklook/glg_lc_medres34_bn200529039.gif
LOC_URL:         http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200529039/quicklook/glg_locplot_all_bn200529039.png
COMMENTS:        Fermi-GBM Final Position.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        The LC_URL file should be available by the time this FINAL notice is produced.  
COMMENTS:        This notice was generated completely by automated pipeline processing.  
COMMENTS:        This is likely a Long GRB.  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(4.0<100sec) coincident with the SWIFT_BAT event (trignum=974942).

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 29 May 20 01:00:16 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     974942,   Seg_Num: 0
GRB_RA:          238.751d {+15h 55m 00s} (J2000),
                 239.032d {+15h 56m 08s} (current),
                 238.065d {+15h 52m 16s} (1950)
GRB_DEC:         -11.057d {-11d 03' 25"} (J2000),
                 -11.116d {-11d 06' 57"} (current),
                 -10.911d {-10d 54' 40"} (1950)
GRB_DATE:        18998 TJD;   150 DOY;   20/05/29
GRB_TIME:        3395.77 SOD {00:56:35.77} UT
TRIGGER_INDEX:   478
GRB_PHI:          61.47 [deg]
GRB_THETA:        29.00 [deg]
DELTA_TIME:      0.00 [sec]
TRIGGER_DUR:     12.160 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     19.26 [sigma]
IMAGE_SIGNIF:    16.33 [sigma]
LC_URL:          sw00974942000msb.lc
SUN_POSTN:        66.38d {+04h 25m 31s}  +21.66d {+21d 39' 41"}
SUN_DIST:        167.32 [deg]   Sun_angle= -11.5 [hr] (East of Sun)
MOON_POSTN:      147.69d {+09h 50m 47s}  +17.66d {+17d 39' 53"}
MOON_DIST:        94.61 [deg]
MOON_ILLUM:      38 [%]
GAL_COORDS:      358.55, 31.37 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      238.96,  9.08 [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 = 40.45,13.14 [deg].

GCN NOTICE

 
TITLE:           GCN/SWIFT NOTICE 
NOTICE_DATE:     Fri 29 May 20 01:00:29 UT 
NOTICE_TYPE:     Swift-XRT Nack-Position 
TRIGGER_NUM:     974942,   Seg_Num: 0 
POINT_RA:        238.839d {+15h 55m 21s} (J2000) 
POINT_DEC:       -11.062d {-11d 03' 44"} (J2000) 
IMG_START_DATE:  18998 TJD;   150 DOY;   20/05/29 
IMG_START_TIME:  3608.70 SOD {01:00:08.70} UT,   212.9 [sec] since BAT Trigger Time 
COUNTS:          8    Min_needed= 20 
STD_DEV:         0.00   Max_StdDev_for_Good=28.44 [arcsec] 
PH2_ITER:        4    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:     Fri 29 May 20 01:04:16 UT
NOTICE_TYPE:     Swift-UVOT Processed Source List
TRIGGER_NUM:     974942,   Seg_Num: 0
POINT_RA:        238.839d {+15h 55m 21s} (J2000)
POINT_DEC:       -11.062d {-11d 03' 43"} (J2000)
POINT_ROLL:      326.309d
IMG_START_DATE:  18998 TJD;   150 DOY;   20/05/29
IMG_START_TIME:  3611.94 SOD {01:00:11.94} UT,   216.2 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.816
N_STARS:         45
X_OFFSET:        567 [pixels]
Y_OFFSET:        0 [pixels]
X_MAX:           1526 [pixels]
Y_MAX:           959 [pixels]
DET_THRESH:      14
PHOTO_THRESH:    7
SL_URL:          sw00974942000msufc0216.fits
SUN_POSTN:        66.38d {+04h 25m 32s}  +21.66d {+21d 39' 42"}
SUN_DIST:        167.37 [deg]   Sun_angle= -11.5 [hr] (East of Sun)
MOON_POSTN:      147.73d {+09h 50m 56s}  +17.65d {+17d 39' 14"}
MOON_DIST:        94.65 [deg]
MOON_ILLUM:      38 [%]
GAL_COORDS:      358.61, 31.30 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      239.05,  9.09 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Processed Source List.  
COMMENTS:        All 4 attachments are included.

GCN Circular #27843
V. Lipunov, E. Gorbovskoy, V.Kornilov, N.Tyurina, P.Balanutsa, A.Kuznetsov, F.Balakin, V.Vladimirov, D. Vlasenko, I.Gorbunov, D.Zimnukhov, V.Senik, T.Pogrosheva, D.Kuvshinov, D. Cheryasov (Lomonosov Moscow State University, SAI, Physics Department),
R. Podesta, C.Lopez, F. Podesta, C.Francile (Observatorio Astronomico Felix Aguilar OAFA),
H.Levato (Instituto de Ciencias Astronomicas, de la Tierra y del Espacio ICATE),
R. Rebolo, M. Serra (The Instituto de Astrofisica de Canarias),
D. Buckley (South African Astronomical Observatory),
O.A. Gres, N.M. Budnev, O.Ershova (Irkutsk State University, API),
A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory),
V. Yurkov, A. Gabovich, Yu. Sergienko (Blagoveschensk Educational State University)
MASTER-IAC robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Spain (IAC Teide Observatory) was pointed to the Swift GRB200529.04 (trigger No 974942,15h 55m 00.24s , -11d 03m 25.2s, R=0.05) errorbox 41 sec after notice time and 103 sec after trigger time at 2020-05-29 00:58:19 UT, with upper limit up to 17.8 mag. The observations began at zenith distance = 40 deg. The sun altitude is -40.4 deg.
The galactic latitude b = 31 deg., longitude l = 359 deg.
Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=1368529
We obtain a following upper limits.
```
Tmid-T0  |          Site       |Filt.| Expt. | Limit| Comment
_________|_____________________|_____|_______|______|________

     113 |          MASTER-IAC |  P| |    20 | 17.2 |        
     151 |          MASTER-IAC |  P| |    30 | 17.6 |        
     197 |          MASTER-IAC |  P| |    40 | 17.8 |        
     261 |          MASTER-IAC |  P| |    50 | 17.8 |        
```
The observation and reduction will continue. The message may be cited.
GCN Circular #27844
The Fermi GBM team reports the detection of a likely LONG GRB
At 00:56:39 UT on 29 May 2020, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 200529A (trigger 612406604.278114 / 200529039).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 239.2, Dec = -18.1 (J2000 degrees, equivalent to J2000 15h 56m, -18d 06'), with a statistical uncertainty of 8.5 degrees.
The angle from the Fermi LAT boresight is 83.0 degrees.
The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200529039/quicklook/glg_skymap_all_bn200529039.png
The HEALPix FITS file, including the estimated localization systematic, can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200529039/quicklook/glg_healpix_all_bn200529039.fit
The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200529039/quicklook/glg_lc_medres34_bn200529039.gif
GCN Circular #27845
V. D'Elia (SSDC), E. Ambrosi (INAF-IASFPA), A. D'Ai (INAF-IASFPA), J.D. Gropp (PSU), J. A. Kennea (PSU), N. J. Klingler (PSU), H. A. Krimm (NSF), S. Laha (GSFC/UMBC/CRESST), A. Y. Lien (GSFC/UMBC), F. E. Marshall (NASA/GSFC), M. J. Moss (GWU), D. M. Palmer (LANL), A. Tohuvavohu (U Toronto) and T. N. Ukwatta (LANL) report on behalf of the Neil Gehrels Swift Observatory Team:
At 00:56:35 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 200529A (trigger=974942). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 238.751, -11.057 which is
```
   RA(J2000) = 15h 55m 00s
   Dec(J2000) = -11d 03' 25"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a weak pulse with a duration of about 30 sec. The peak count rate was ~1700 counts/sec (15-350 keV), at ~1 sec after the trigger.
The XRT began observing the field at 01:00:08.7 UT, 212.9 seconds after the BAT trigger. Using promptly downlinked data we find an uncatalogued X-ray source located at RA, Dec 238.76571, -11.07215 which is equivalent to:
```
   RA(J2000)  = 15h 55m 03.77s
   Dec(J2000) = -11d 04' 19.7"
```
with an uncertainty of 5.2 arcseconds (radius, 90% containment). This location is 75 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. No spectrum from the promptly downlinked event data is yet available to determine the column density.
UVOT took a finding chart exposure of 144 seconds with the White filter starting 216 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 56% of the XRT error circle. The typical 3-sigma upper limit has been about 19.6 mag. The 8'x8' region for the list of sources generated on-board covers 100% of the XRT error circle. The list of sources is typically complete to about 18 mag. No correction has been made for the expected extinction corresponding to E(B-V) of 0.29.
Burst Advocate for this burst is V. D'Elia (delia AT ssdc.asi.it). Please contact the BA by email if you require additional information regarding Swift followup of this burst. In extremely urgent cases, after trying the Burst Advocate, you can contact the Swift PI by phone (see Swift TOO web site for information: http://www.swift.psu.edu/)
GCN Circular #27846
Daniele B. Malesani (DTU Space), Tapio Pursimo (NOT), Charles L. Steinhardt (DAWN/NBI), report:
We observed the field of GRB 200529A (D'Elia et al., GCN 27845) using the Nordic Optical Telescope equipped with the ALFOSC camera.
In a single 300-s image, starting on May 29.052 UT (18.9 min after the GRB), we detect a bright point source just outside the currently available XRT position, which is not visible in the archival Pan-STARRS images of the same field. We measure for this object the following position (J2000):
```
RA = 15:55:03.21
Dec = -11:04:26.2
```
By comparison with nearby stars from the Pan-STARRS catalog, we measure a magnitude r = 20.00 +- 0.02.
We conclude that this object is the optical afterglow of GRB 200529A.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 29 May 20 01:07:31 UT
NOTICE_TYPE:     Swift-UVOT Image
TRIGGER_NUM:     974942,   Seg_Num: 0
POINT_RA:        238.839d {+15h 55m 21s} (J2000)
POINT_DEC:       -11.062d {-11d 03' 43"} (J2000)
ROLL:            326.309d
IMG_START_DATE:  18998 TJD;   150 DOY;   20/05/29
IMG_START_TIME:  3611.94 SOD {01:00:11.94} UT,   216.2 [sec] since BAT Trigger Time
FILTER:          10, White
EXPOSURE_ID:     612406836
X_OFFSET:        886 [pixels]
Y_OFFSET:        319 [pixels]
WIDTH:           160 [pixels]
HEIGHT:          160 [pixels]
X_GRB_POS:       1046
Y_GRB_POS:       479
BINNING_INDEX:   1
IM_URL:          sw00974942000msuni0242.fits
SUN_POSTN:        66.39d {+04h 25m 33s}  +21.66d {+21d 39' 44"}
SUN_DIST:        167.37 [deg]   Sun_angle= -11.5 [hr] (East of Sun)
MOON_POSTN:      147.76d {+09h 51m 03s}  +17.64d {+17d 38' 42"}
MOON_DIST:        94.62 [deg]
MOON_ILLUM:      38 [%]
GAL_COORDS:      358.61, 31.30 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      239.05,  9.09 [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:     Fri 29 May 20 01:03:56 UT
NOTICE_TYPE:     Swift-UVOT Source List
TRIGGER_NUM:     974942,   Seg_Num: 0
POINT_RA:        238.839d {+15h 55m 21s} (J2000)
POINT_DEC:       -11.062d {-11d 03' 43"} (J2000)
POINT_ROLL:      326.309d
IMG_START_DATE:  18998 TJD;   150 DOY;   20/05/29
IMG_START_TIME:  3611.94 SOD {01:00:11.94} UT,   216.2 [sec] since BAT Trigger Time
FILTER:          10, White
BKG_MEAN:        2.816
N_STARS:         45
X_OFFSET:        567 [pixels]
Y_OFFSET:        0 [pixels]
X_MAX:           1526 [pixels]
Y_MAX:           959 [pixels]
DET_THRESH:      14
PHOTO_THRESH:    7
SL_URL:          sw00974942000msufc0216.fits
SUN_POSTN:        66.38d {+04h 25m 32s}  +21.66d {+21d 39' 42"}
SUN_DIST:        167.37 [deg]   Sun_angle= -11.5 [hr] (East of Sun)
MOON_POSTN:      147.73d {+09h 50m 55s}  +17.65d {+17d 39' 17"}
MOON_DIST:        94.66 [deg]
MOON_ILLUM:      38 [%]
GAL_COORDS:      358.61, 31.30 [deg] galactic lon,lat of the pointing direction
ECL_COORDS:      239.05,  9.09 [deg] ecliptic lon,lat of the pointing direction
COMMENTS:        SWIFT-UVOT Source List.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 29 May 20 01:04:17 UT
NOTICE_TYPE:     Swift-XRT Position
TRIGGER_NUM:     974942,   Seg_Num: 0
GRB_RA:          238.7657d {+15h 55m 03.76s} (J2000),
                 239.0463d {+15h 56m 11.10s} (current),
                 238.0791d {+15h 52m 18.97s} (1950)
GRB_DEC:         -11.0721d {-11d 04' 19.5"} (J2000),
                 -11.1308d {-11d 07' 50.7"} (current),
                 -10.9263d {-10d 55' 34.7"} (1950)
GRB_ERROR:       5.2 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN:       1.00e-10 [erg/cm2/sec]
GRB_SIGNIF:      10.00 [sigma]
IMG_START_DATE:  18998 TJD;   150 DOY;   20/05/29
IMG_START_TIME:  3667.00 SOD {01:01:07.00} UT,   271.2 [sec] since BAT Trigger Time
TAM[0-3]:        100.00 100.00 100.00 100.00
AMPLIFIER:       1
WAVEFORM:        31
SUN_POSTN:        66.38d {+04h 25m 32s}  +21.66d {+21d 39' 42"}
SUN_DIST:        167.34 [deg]   Sun_angle= -11.5 [hr] (East of Sun)
MOON_POSTN:      147.73d {+09h 50m 56s}  +17.65d {+17d 39' 13"}
MOON_DIST:        94.59 [deg]
MOON_ILLUM:      38 [%]
GAL_COORDS:      358.55, 31.34 [deg] galactic lon,lat of the burst
ECL_COORDS:      238.98,  9.07 [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 0.11% < P(seren) < 0.58%.

GCN Circular #27847
WeiKang Zheng and Alexei V. Filippenko (UC Berkeley) report on behalf of the KAIT GRB team:
The 0.76-m Katzman Automatic Imaging Telescope (KAIT), located at Lick Observatory, observed the field of GRB 200529A (GBM detection: GCN 27844; Swift detection: D'Elia et al., GCN 27845), starting at ~5.25 hours after the burst. We obtained 23x60s images in the clear (roughly R) filter. We marginally detect, therefore confirm the optical afterglow reported by Malesani et al. (GCN 27846) in our co-added image. We estimate the afterglow to be 21.2 +/- 0.2 magnitude in clear filter, calibrated to PS1 catalog.
GCN Circular #27848
M.R. Goad, J.P. Osborne, A.P. Beardmore and P.A. Evans (U. Leicester) report on behalf of the Swift-XRT team.
Using 1535 s of XRT Photon Counting mode data and 5 UVOT images for GRB 200529A, 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 = 238.76394, -11.07363 which is equivalent to:
```
RA (J2000): 15h 55m 3.34s
Dec (J2000): -11d 04' 25.1"
```
with an uncertainty of 1.8 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 #27853
Y.-D. Hu, E. Fernandez-Garcia, A. J. Castro-Tirado (IAA-CSIC), C. Perez del Pulgar, A. Castellon, I. Carrasco (Univ. de Malaga), R. Fernandez-Munoz (IHSM/UMA-CSIC), M.D. Caballero-Garcia and M. Jelinek (ASU-CAS), on behalf of a larger collaboration, report:
The 60cm BOOTES-2/TELMA robotic telescope at IHSM La Mayora (UMA-CSIC) in Algarrobo Costa (Malaga, Spain) automatically responded to GRB 200529A as detected by Swift (D'Elia et al GCNC 27845). No new source is seen in the initial 10s exposure gathered at 00:58:28 UT(~ 113 s after the burst onset) down to a 18.0 limiting magnitude. Further images (20 x 10s) were combined to produce a deeper image down to 18.8 mag limit at median time of 10.5 min post burst. No early-time bright optical emission is detected at the NOT (Malesani et al. GCNC 27846) and KAIT (Zheng et al. GCNC 27847) reported optical afterglow.
We thank the staff at La Mayora for its excellent support.
GCN Circular #27858
R. Strausbaugh (U. of the Virgin Islands), A. Cucchiara (U. of the Virgin Islands/College of Marin) report on behalf of a larger collaboration:
We observed Swift GRB 200529A (D'Elia et al., GCN 27845) with the LCO 1-m Sinistro instrument at the Siding Spring Observatory, Australia site, on May 29, from 10:05 to 10:28 UT (corresponding to 9.15 to 9.53 hours from the GRB trigger time) with the Bessel R and I filters.
We performed a series of 5x120s exposures in R and I. We clearly detect an optical source in R band, and force a detection in I band with less than one sigma significance, in stacked images at a location consistent with other optical afterglow detections (Malesani et al., GCN 27846; Zheng et al., GCN 27847). Using the USNO-B.1 catalog as reference, we calculate the following magnitudes:
R = 21.76 +/- 0.18
I = 22.82 +/- 1.06
These magnitudes are not corrected for galactic extinction.
R.S. is funded by NSF AST grant #1831682
GCN Circular #27859
O.J. Roberts (USRA) and C. Meegan (UAH) report on behalf of the Fermi GBM Team:
"At 00:56:39.28 UT on May 29th 2020, the Fermi Gamma-Ray Burst Monitor (GBM) triggered and located GRB 200529A (trigger 612406604 / 200529039) which was also detected by the Swift (V. D'Elia et al. 2020, GCN 27845). The Fermi GBM Final Real-time Localization (GCN 27844) is consistent with the Swift position.
The angle from the Fermi LAT boresight at the GBM trigger time is 77 degrees.
The GBM light curve shows multiple peaks with a duration (T90) of about 85 s (50-300 keV). The time-averaged spectrum from T0-3.5 s to T0+81.5 s is best fit by a power law function with an exponential high-energy cutoff. The power law index is -1.34 (+0.16/-0.15) and the cutoff energy, parameterized as Epeak, is 73.99 (+11.10/-8.18) keV.
The event fluence (10-1000 keV) in this time interval is (4.08 +/- 0.27)E-06 erg/cm^2. The 1-sec peak photon flux Measured starting from T0+17.8 s in the 10-1000 keV band is 2.7 +/- 0.2 ph/s/cm^2.
The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog: https://heasarc.gsfc.nasa.gov/W3Browse/fermi/fermigbrst.html
For Fermi GBM data and info, please visit the official Fermi GBM Support Page: https://fermi.gsfc.nasa.gov/ssc/data/access/gbm/"
GCN Circular #27863
A. D'Ai (INAF-IASFPA), D.N. Burrows (PSU), J. D. Gropp (PSU), J.A. Kennea (PSU), K.L. Page (U. Leicester), A.P. Beardmore (U. Leicester), P.A. Evans (U. Leicester), A. Melandri (INAF-OAB) and V. D'Elia report on behalf of the Swift-XRT team:
We have analysed 3.7 ks of XRT data for GRB 200529A (D'Elia et al. GCN Circ. 27845), from 197 s to 44.3 ks after the BAT trigger. The data comprise 51 s in Windowed Timing (WT) mode (the first 8 s were taken while Swift was slewing) with the remainder in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Goad et al. (GCN Circ. 27848).
The light curve can be modelled with an initial power-law decay with an index of alpha=4.0 (+/-0.6), followed by a break at T+580 s to an alpha of 0.44 (+0.19, -0.17).
A spectrum formed from the WT mode data can be fitted with an absorbed power-law with a photon spectral index of 2.29 (+0.29, -0.20). The best-fitting absorption column is consistent with the Galactic value of 2.4 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 2.8 x 10^-11 (4.5 x 10^-11) erg cm^-2 count^-1.
A summary of the WT-mode spectrum is thus:
```
Total column:	     2.4 (+/-0.8) x 10^21 cm^-2
Galactic foreground: 2.4 x 10^21 cm^-2
Excess significance: <1.6 sigma
Photon index:	     2.29 (+0.29, -0.20)
```
If the light curve continues to decay with a power-law decay index of 0.44, 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 3.7 x 10^-13 (5.9 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/00974942.
This circular is an official product of the Swift-XRT team.
GCN Circular #27868
H. A. Krimm (NSF), S. D. Barthelmy (GSFC), J. R. Cummings (CPI), V. D'Elia (SSDC), S. Laha (GSFC/UMBC), 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-61 to T+242 sec from the recent telemetry downlink, we report further analysis of BAT GRB 200529A (trigger #974942) (V. D'Elia, et al., GCN Circ. 27845). The BAT ground-calculated position is RA, Dec = 238.756, -11.076 deg which is
```
   RA(J2000)  =  15h 55m 01.3s
   Dec(J2000) = -11d 04' 34.5"
```
with an uncertainty of 1.2 arcmin, (radius, sys+stat, 90% containment). The partial coding was 50%.
The mask weighted light curve shows a complex structure. The overall structure starts at ~T-5 s and lasts till ~T+100 s. T90 (15-350 keV) is 79.57 +- 7.26 sec (estimated error including systematics).
The time-averaged spectrum from T-1.24 to T+92.92 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.89 +- 0.10. The fluence in the 15-150 keV band is 3.2 +- 0.2 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+1.58 sec in the 15-150 keV band is 1.8 +- 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/974942/BA/
GCN Circular #27878
F. Ogawa, R. Adachi, R. Hosokawa, M. Niwano, K. L. Murata, N. Nakamura, Y. Yatsu, and N. Kawai(TokyoTech) report on behalf of the MITSuME collaboration:
We observed the field of GRB 200529A (Fermi GBM team, GCN #27844; D'Elia et al. GCN #27845) with the optical three color (g', Rc, and Ic) CCD cameras attached to the MITSuME 50 cm telescope of Akeno Observatory, Yamanashi, Japan.
The observation started on 10:25:35 UT. The first 47 images were heavily affected by the bad weather at Akeno Observatory. We did not detect the optical afterglow (Daniele et al., GCN #27846; WeiKang et al., GCN #27847; Strausbaugh et al., GCN #27858) in the stacked image. We obtained the 5-sigma limits as follows.
```
T0+[hour] MID-UT T-EXP[sec] 5-sigma limits
------------------------------------------------------------------------------------------------
10.3 11:35:06 1140 g'>17.3, Rc>17.1, Ic>16.5
------------------------------------------------------------------------------------------------
T0+: Elapsed time after the burst
T-EXP: Total Exposure time
```
We used UCAC4 catalog for flux calibration. The magnitudes are expressed in the AB system. The images were processed in real-time through the MITSuME GPU reduction pipeline (Niwano et al., submitted; https://github.com/MNiwano/Eclair)
GCN Circular #27884
GRB 200529A: Swift/UVOT Upper Limits
K. K. Simpson (PSU) and V. D'Elia (SSDC) report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 200529A 195 s after the BAT trigger (D'Elia et al., GCN Circ. 27845). No optical afterglow consistent with the optical position (Malesani et al. GCN Circ. 27846) 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           216          360          142         >19.8
white              216          360          142         >19.8
v                  195         3771          209         >19.1
b                 4392         4495          102         >19.5
u                 4187         4386          197         >19.7
w1                3982         4182          197         >19.0
m2                3777         3977          197         >20.2
```
The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.29 in the direction of the burst (Schlegel et al. 1998).

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Jochen Greiner, last update: 03-Jun-2020 [Disclaimer]