Gamma-ray Burst 211018A

(All information courtesy of the instrument teams.)

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GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Mon 18 Oct 21 22:28:38 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      46
TRIGGER_NUM:     656288898
GRB_RA:           13.483d {+00h 53m 56s} (J2000),
                  13.765d {+00h 55m 04s} (current),
                  12.838d {+00h 51m 21s} (1950)
GRB_DEC:          +4.467d {+04d 28' 00"} (J2000),
                  +4.585d {+04d 35' 05"} (current),
                  +4.196d {+04d 11' 44"} (1950)
GRB_ERROR:       8.85 [deg radius, statistical plus systematic]
GRB_INTEN:       445 [cnts/sec]
DATA_SIGNIF:     19.20 [sigma]
INTEG_TIME:      1.024 [sec]
GRB_DATE:        19505 TJD;   291 DOY;   21/10/18
GRB_TIME:        80893.94 SOD {22:28:13.94} UT
GRB_PHI:         168.00 [deg]
GRB_THETA:        60.00 [deg]
DATA_TIME_SCALE: 1.0240 [sec]
HARD_RATIO:      1.02
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      98%  GRB
2nd_MOST_LIKELY:   1%  Generic SGR
DETECTORS:       0,0,0, 0,0,0, 0,0,0, 0,1,1, 0,0,
SUN_POSTN:       203.89d {+13h 35m 33s}   -9.96d {-09d 57' 18"}
SUN_DIST:        168.62 [deg]   Sun_angle= -11.3 [hr] (East of Sun)
MOON_POSTN:        7.64d {+00h 30m 34s}   -1.34d {-01d 20' 11"}
MOON_DIST:         8.51 [deg]
MOON_ILLUM:      97 [%]
GAL_COORDS:      124.12,-58.40 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       14.14, -1.20 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn211018936/quicklook/glg_lc_medres34_bn211018936.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 53.00,18.57 [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 18 Oct 21 22:28:48 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      59
TRIGGER_NUM:     656288898
GRB_RA:           11.117d {+00h 44m 28s} (J2000),
                  11.396d {+00h 45m 35s} (current),
                  10.476d {+00h 41m 54s} (1950)
GRB_DEC:          -0.183d {-00d 10' 59"} (J2000),
                  -0.064d {-00d 03' 50"} (current),
                  -0.457d {-00d 27' 23"} (1950)
GRB_ERROR:       5.10 [deg radius, statistical plus systematic]
GRB_INTEN:       509 [cnts/sec]
DATA_SIGNIF:     44.90 [sigma]
INTEG_TIME:      4.096 [sec]
GRB_DATE:        19505 TJD;   291 DOY;   21/10/18
GRB_TIME:        80893.94 SOD {22:28:13.94} UT
GRB_PHI:         166.00 [deg]
GRB_THETA:        65.00 [deg]
DATA_TIME_SCALE: 4.0960 [sec]
HARD_RATIO:      0.81
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      98%  GRB
2nd_MOST_LIKELY:   1%  Generic Transient
DETECTORS:       0,0,0, 0,0,0, 0,0,0, 0,1,1, 0,0,
SUN_POSTN:       203.89d {+13h 35m 33s}   -9.96d {-09d 57' 18"}
SUN_DIST:        164.04 [deg]   Sun_angle= -11.2 [hr] (East of Sun)
MOON_POSTN:        7.64d {+00h 30m 34s}   -1.34d {-01d 20' 09"}
MOON_DIST:         3.96 [deg]
MOON_ILLUM:      97 [%]
GAL_COORDS:      119.09,-63.00 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       10.15, -4.57 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn211018936/quicklook/glg_lc_medres34_bn211018936.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 53.00,18.57 [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 18 Oct 21 22:28:57 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      58
TRIGGER_NUM:     656288898
GRB_RA:           15.630d {+01h 02m 31s} (J2000),
                  15.909d {+01h 03m 38s} (current),
                  14.991d {+00h 59m 58s} (1950)
GRB_DEC:          -0.680d {-00d 40' 47"} (J2000),
                  -0.563d {-00d 33' 47"} (current),
                  -0.949d {-00d 56' 54"} (1950)
GRB_ERROR:       1.23 [deg radius, statistical only]
DATA_SIGNIF:     47.20 [sigma]
DATA_INTERVAL:   4.096 [sec]
GRB_DATE:        19505 TJD;   291 DOY;   21/10/18
GRB_TIME:        80893.94 SOD {22:28:13.94} UT
GRB_PHI:         171.00 [deg]
GRB_THETA:        65.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   4173 (Gnd S/W Version number)
SUN_POSTN:       203.89d {+13h 35m 33s}   -9.96d {-09d 57' 18"}
SUN_DIST:        166.82 [deg]   Sun_angle= -11.5 [hr] (East of Sun)
MOON_POSTN:        7.64d {+00h 30m 34s}   -1.34d {-01d 20' 07"}
MOON_DIST:         8.30 [deg]
MOON_ILLUM:      97 [%]
GAL_COORDS:      129.13,-63.42 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       14.13, -6.78 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn211018936/quicklook/glg_lc_medres34_bn211018936.gif
POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_656288898.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:     Tue 19 Oct 21 04:07:01 UT
NOTICE_TYPE:     Fermi-GBM Final Position
RECORD_NUM:      0
TRIGGER_NUM:     656288898
GRB_RA:           20.100d {+01h 20m 24s} (J2000),
                  20.382d {+01h 21m 32s} (current),
                  19.453d {+01h 17m 49s} (1950)
GRB_DEC:          +4.110d {+04d 06' 36"} (J2000),
                  +4.224d {+04d 13' 26"} (current),
                  +3.848d {+03d 50' 53"} (1950)
GRB_ERROR:       1.00 [deg radius, statistical only]
GRB_DATE:        19505 TJD;   291 DOY;   21/10/18
GRB_TIME:        80893.94 SOD {22:28:13.94} UT
GRB_PHI:         175.61 [deg]
GRB_THETA:        59.78 [deg]
E_RANGE:         50.000 - 300.000 [keV]
LOC_ALGORITHM:   415 (Gnd S/W Version number)
SUN_POSTN:       204.11d {+13h 36m 26s}  -10.04d {-10d 02' 23"}
SUN_DIST:        173.11 [deg]   Sun_angle= -11.8 [hr] (East of Sun)
MOON_POSTN:       10.28d {+00h 41m 06s}   -0.03d {-00d 01' 46"}
MOON_DIST:        10.96 [deg]
MOON_ILLUM:      98 [%]
GAL_COORDS:      136.65,-57.99 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       20.11, -4.05 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn211018936/quicklook/glg_lc_medres34_bn211018936.gif
LOC_URL:         http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2021/bn211018936/quicklook/glg_locplot_all_bn211018936.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 has human-in-the-loop processing.  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(0.0<100sec) coincident with the INTEGRAL_SPIACS event (trignum=9452).

GCN NOTICE

TITLE:          GCN/INTEGRAL NOTICE
NOTICE_DATE:    Mon 18 Oct 21 22:29:33 UT
NOTICE_TYPE:    INTEGRAL SPI ACS Trigger
TRIGGER_NUM:    9452,   Sub_Num: 0
GRB_INTEN:      9.21 [sigma]
GRB_TIME:       80893.03 SOD {22:28:13.03} UT
GRB_DATE:       19505 TJD;   291 DOY;   21/10/18
COMMENTS:       INTEGRAL SPI_ACS GRB Trigger.  
COMMENTS:       Time_Scale=2.0000 and Time_Error=1.0000.  
COMMENTS:
COMMENTS:       NOTE: This SPIACS event is temporally(0.0<100sec) coincident with the FERMI_GBM event (trignum=656288898).  
COMMENTS:
COMMENTS:       The SPIACS lightcurve can be found at:  
COMMENTS:       ftp://isdcarc.unige.ch/arc/FTP/ibas/spiacs/2021-10/2021-10-18T22-28-12.8466-20871-23440-0.lc

GCN Circular #30940
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),
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-SAAO robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in South Africa (South African Astronomical Observatory) started inspect of the Fermi GRB211018.94 (trigger No 656288898,01h 02m 31.20s , -00d 40m 48.0s, R=1.23) errorbox 57 sec after notice time and 87 sec after trigger time at 2021-10-18 22:29:41 UT, with upper limit up to 16.4 mag. The observations began at zenith distance = 32 deg. The sun altitude is -48.1 deg.
The galactic latitude b = -63 deg., longitude l = 130 deg.
Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=1756363
We obtain a following upper limits.
```
Tmid-T0  |      Date Time      |          Site       |             Coord (J2000)          |Filt.| Expt. | Limit| Comment
_________|_____________________|_____________________|____________________________________|_____|_______|_______|________

      97 | 2021-10-18 22:29:41 |         MASTER-SAAO | (01h 02m 32.62s , -00d 53m 28.3s) |   C |    20 | 15.8 |        
     122 | 2021-10-18 22:29:41 |         MASTER-SAAO | (01h 02m 32.62s , -00d 53m 28.3s) |   C |    70 | 16.4 |  Coadd 
     137 | 2021-10-18 22:30:20 |         MASTER-SAAO | (01h 02m 38.46s , -00d 53m 07.0s) |   C |    20 | 15.9 |        
     181 | 2021-10-18 22:31:00 |         MASTER-SAAO | (01h 02m 35.96s , -00d 51m 51.5s) |   C |    30 | 16.0 |        
```
Filter C is a clear (unfiltred) band.
The observation and reduction will continue. The message may be cited.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Tue 19 Oct 21 04:59:41 UT
NOTICE_TYPE:     Fermi-LAT Offline Position
TRIGGER_NUM:     211018936
GRB_RA:           19.677d {+01h 18m 42s} (J2000),
                  19.954d {+01h 19m 49s} (current),
                  19.042d {+01h 16m 10s} (1950)
GRB_DEC:          -3.599d {-03d 35' 55"} (J2000),
                  -3.485d {-03d 29' 04"} (current),
                  -3.862d {-03d 51' 41"} (1950)
GRB_ERROR:       11.34 [arcmin radius, 90% containment, statistical only]
GRB_DATE:        19505 TJD;   291 DOY;   21/10/18
GRB_TIME:        80893.00 SOD {22:28:13.00} UT
TRIGGER_ID:      0x20000000
MISC:            0x40000000
SUN_POSTN:       204.14d {+13h 36m 34s}  -10.05d {-10d 03' 10"}
SUN_DIST:        165.83 [deg]   Sun_angle= -11.7 [hr] (East of Sun)
MOON_POSTN:       10.68d {+00h 42m 44s}   +0.17d {+00d 10' 24"}
MOON_DIST:         9.96 [deg]
MOON_ILLUM:      98 [%]
GAL_COORDS:      139.59,-65.59 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       16.78,-11.03 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        Fermi LAT Offline position.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        It is the result of human-in-the-loop processing.  
COMMENTS:        This is a human generated position of a LAT ground detection.  
COMMENTS:        This source corresponds to GBM trigger.

GCN Circular #30943
M. Arimoto (Kanazawa Univ.), M. Axelsson (KTH & Stockholm Univ.), N. Di Lalla (Stanford Univ.), N. Omodei (Stanford Univ.), F. Longo (Univ. and INFN, Trieste) and D. Tak (DESY) report on behalf of the Fermi-LAT Collaboration:
On October 18th, 2021, Fermi-LAT detected high-energy emission from GRB 211018A, which was also detected by Fermi GBM (trigger 656288898 / 211018936). The best LAT on-ground location is found to be
RA, Dec = 19.68, -3.60 (degrees, J2000)
with an error radius of 0.19 deg (90% containment, statistical error only).
The position was 68 deg from the LAT boresight at the time of the GBM trigger:
T0 = 22:28:13.9 UT.
The data from the Fermi-LAT show a significant increase in the event rate after the trigger that is temporally and spatially correlated with the GBM emission with high significance. The photon flux above 100 MeV in the time interval 0-300 s after the trigger is 1.2 (-/+ 0.3) e-04 ph/cm2/s.
The estimated photon index above 100 MeV is -2.0 (-/+ 0.2).
The highest-energy photon is a 3.3 GeV event which is observed 25 seconds after the GBM trigger.
A Swift ToO has been requested for this burst.
The Fermi-LAT point of contact for this burst is Donggeun Tak (takdg123@gmail.com).
The Fermi-LAT is a pair conversion telescope designed to cover the energy band from 20 MeV to greater than 300 GeV. It is the product of an international collaboration between NASA and DOE in the U.S. and many scientific institutions across France, Italy, Japan and Sweden.
GCN Circular #30945
M. Ohno (Eotvos U./Konkoly Observatory/Hiroshima U.), J. Ripa (Masaryk U.), H. Takahashi (Hiroshima U.), A. Pal, L. Meszaros, B. Csak (Konkoly Observatory), N. Werner, M. Topinka, F. Munz, F. Hroch (Masaryk U.), T. Urbanec, M. Kasal, A. Povalac (Brno U. of Technology), J. Hudec, J. Kapus, M. Frajt (Spacemanic s.r.o), R. Laszlo, M. Koleda (Needronix s.r.o), M. Smelko, P. Hanak, P. Lipovsky (Technical U. of Kosice), G. Galgoczi (Wigner Research Center/Eotvos U.), Yuusuke Uchida, Helen Poon, H. Matake, N. Uchida (Hiroshima U.), T. Bozoki (Eotvos U.), G. Dalya (Eotvos U.), T. Enoto (Kyoto U.), Zs. Frei (Eotvos U.), G. Friss (Eotvos U.), Y. Fukazawa, K. Hirose (Hiroshima U.), S. Hisadomi (Nagoya U.), Y. Ichinohe (Rikkyo U.), K. Kapas (Eotvos U.), L. L. Kiss (Konkoly Observatory), T. Mizuno (Hiroshima U.), K. Nakazawa (Nagoya U.), H. Odaka (Univ of Tokyo), J. Takatsy (Eotvos U.), K. Torigoe (Hiroshima U.) -- the GRBAlpha collaboration.
The bright/long duration GRB 211018A (Fermi-GBM detection trigger 656288898/211018936, Fermi-LAT detection; Arimoto et al., GCN Circ. 30943) was detected by the GRBAlpha 1U CubeSat (Pal et al. Proc. SPIE 2020).
The light curve shows a very long multiple-peaked structure with a duration of about 168 s (T90 = 140 s). At 22:29:34 UTC, our detection reached a SNR ~ 46.
The light curve obtained by GRBAlpha is available here: https://grbalpha.konkoly.hu/static/share/GRB211018A_GCN.pdf
GRBAlpha is a demonstration mission for a future CubeSats constellation (Werner et al. Proc. SPIE 2018). The detector of GRBAlpha consists of a 75 x 75 x 5 mm3 CsI scintillator read out by a SiPM array, covering the energy range from ~50 keV to ~1000 keV. GRBAlpha was launched on 2021 March 22 from Baikonur. After its commissioning phase, the scientific observations are now under way. To increase the duty cycle and the downlink rate, the upgrade of the on-board data acquisition software stack is in progress. The ground segment is also supported by the radio amateur community and it takes advantage of the SatNOGS network for increased data downlink volume.
GCN Circular #30947
O.J Roberts (USRA/NASA-MSFC) and C. Meegan (UAH) report on behalf of the Fermi GBM Team:
"At 22:28:13.94 UT on 18 October 2021, the Fermi Gamma-Ray Burst Monitor (GBM) triggered and located GRB 211018A (trigger 656288898 / 211018936), which was also detected by the Fermi LAT (M. Axelsson et al. 2021, GCN 30943), and GRBAlpha (M. Ohno, GCN 30945). The GBM on-ground location is consistent with the Fermi-LAT position.
The angle from the Fermi LAT boresight at the GBM trigger time is 68 degrees.
The GBM light curve consists of multiple peaks with a duration (T90) of 123.9 s (50-300 keV). The time-averaged spectrum from T-2.4s to T0+142.0 s is well fit by a power law function with an exponential high-energy cutoff. The power law index is -0.75 +/- 0.01 and the cutoff energy, parameterized as Epeak, is 351.4 +/- 4.9 keV.
The Band function also fits the burst equally well, with parameters, alpha= -0.74 +/- 0.01, beta= -3.13 +/- 0.28 and Epeak of 344.6 +/- 6.2 keV.
The event fluence (10-1000 keV) in the T90 interval is (1.53347 +/- 0.0003)E-04 erg/cm^2. The 1-sec peak photon flux measured starting from T0+134.5 s in the 10-1000 keV band is 15.6 +/- 0.3 ph/s/cm^2.
We note that owing to the large total fluence of this burst, the 1-sec peak photon flux begins after the T90.
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 #30953
P. A. Evans (U. Leicester) reports on behalf of the Swift team:
Swift has initiated a ToO observation of the Fermi/LAT GRB 211018A. Automated analysis of the XRT data will be presented online at https://www.swift.ac.uk/ToO_GRBs/00021463
Any uncatalogued X-ray sources detected in this analysis will be reported on this website and via GCN COUNTERPART notices. These are not necessarily related to the Fermi/LAT event. Any X-ray source considered to be a probable afterglow candidate will be reported via a GCN Circular after manual consideration.
Details of the XRT automated analysis methods are detailed in Evans et al. (2007, A&A, 469, 379; 2009, MNRAS, 397, 1177 and 2014, ApJS, 210, 8).
This circular is an official product of the Swift-XRT team.

GCN Circular #31010
S. Dichiara (PSU), B. Sbarufatti (PSU), K.L. Page (U. Leicester), A.P. Beardmore (U. Leicester), P. D'Avanzo (INAF-OAB), M.G. Bernardini (INAF-OAB), E. Ambrosi (INAF-IASFPA) , D.N. Burrows (PSU), J. D. Gropp (PSU) and P.A. Evans (U. Leicester) report on behalf of the Swift-XRT team:
Swift-XRT has performed follow-up observations of the Fermi/LAT-detected burst GRB 211018A (Arimoto et al. GCN Circ. 30943), collecting 4.4 ks of Photon Counting (PC) mode data between T0+304.3 ks and T0+340.2 ks.
Five uncatalogued X-ray sources have been detected, however none of them is above the RASS limit or shows definitive signs of fading. Therefore, at the present time we cannot identify which, if any, is the afterglow. We notice that Source 2 and Source 4 are consistent with catalogued quasars at redshift z = 0.64 and z=1.09, respectively. Details of these sources are given below:
Source 1:

  RA (J2000.0):  19.5986  =  01:18:23.66
  Dec (J2000.0): -3.6511  =  -03:39:04.1
  Error: 6.1 arcsec (radius, 90% conf. [Enhanced position])
  Count-rate: (2.68 [+1.16, -0.92])e-3 ct s^-1	 
  Distance: 338 arcsec from Fermi/LAT position.
  Flux: (9.3 [+4.0, -3.2])e-14 erg cm^-2 s^-1 (observed, 0.3-10 keV)

Source 2:

  RA (J2000.0):  19.5656  =  01:18:15.74
  Dec (J2000.0): -3.3800  =  -03:22:48.2
  Error: 5.1 arcsec (radius, 90% conf. [Enhanced position])
  Count-rate: (9.6 [+3.9, -3.1])e-3 ct s^-1   
  Distance: 884 arcsec from Fermi/LAT position.

Source 3:

  RA (J2000.0):  19.4544  =  01:17:49.06
  Dec (J2000.0): -3.6662  =  -03:39:58.4
  Error: 7.2 arcsec (radius, 90% conf.)
  Count-rate: (3.6 [+1.4, -1.1])e-3 ct s^-1   
  Distance: 835 arcsec from Fermi/LAT position.
  Flux: (1.85 [+0.70, -0.56])e-13 erg cm^-2 s^-1 (observed, 0.3-10 keV)

Source 4:

  RA (J2000.0):  19.5576  =  01:18:13.83
  Dec (J2000.0): -3.7295  =  -03:43:46.2
  Error: 3.2 arcsec (radius, 90% conf. [Enhanced position])
  Count-rate: (6.6 +/- 1.6)e-3 ct s^-1	 
  Distance: 636 arcsec from Fermi/LAT position.
  Flux: (1.70 +/- 0.40)e-13 erg cm^-2 s^-1 (observed, 0.3-10 keV)

Source 5:

  RA (J2000.0):  19.6548  =  01:18:37.16
  Dec (J2000.0): -3.6066  =  -03:36:23.9
  Error: 8.0 arcsec (radius, 90% conf.)
  Count-rate: (2.46 [+1.08, -0.85])e-3 ct s^-1	 
  Distance: 84 arcsec from Fermi/LAT position.
  Flux: (5.3 [+2.3, -1.8])e-14 erg cm^-2 s^-1 (observed, 0.3-10 keV)

The results of the XRT-team automatic analysis of the XRT observations, including a position-specific upper limit calculator, are available at https://www.swift.ac.uk/ToO_GRBs/00021463.
This circular is an official product of the Swift-XRT team.

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Jochen Greiner, last update: 26-Oct-2021 [Disclaimer]