Gamma-ray Burst 201016A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

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Results of Observations

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Fri 16 Oct 20 00:28:25 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      60
TRIGGER_NUM:     624500874
GRB_RA:          167.433d {+11h 09m 44s} (J2000),
                 167.702d {+11h 10m 48s} (current),
                 166.788d {+11h 07m 09s} (1950)
GRB_DEC:          +4.517d {+04d 31' 00"} (J2000),
                  +4.404d {+04d 24' 13"} (current),
                  +4.788d {+04d 47' 17"} (1950)
GRB_ERROR:       5.02 [deg radius, statistical plus systematic]
GRB_INTEN:       3161 [cnts/sec]
DATA_SIGNIF:     47.90 [sigma]
INTEG_TIME:      0.128 [sec]
GRB_DATE:        19138 TJD;   290 DOY;   20/10/16
GRB_TIME:        1669.59 SOD {00:27:49.59} UT
GRB_PHI:         330.00 [deg]
GRB_THETA:        85.00 [deg]
DATA_TIME_SCALE: 0.1280 [sec]
HARD_RATIO:      0.70
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      97%  GRB
2nd_MOST_LIKELY:   2%  Generic Transient
DETECTORS:       0,0,0, 1,1,1, 0,0,0, 0,0,0, 0,0,
SUN_POSTN:       201.38d {+13h 25m 32s}   -8.98d {-08d 58' 50"}
SUN_DIST:         36.15 [deg]   Sun_angle= 2.2 [hr] (West of Sun)
MOON_POSTN:      192.48d {+12h 49m 56s}   -0.22d {-00d 13' 06"}
MOON_DIST:        25.19 [deg]
MOON_ILLUM:      1 [%]
GAL_COORDS:      251.43, 56.85 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      166.68, -0.80 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn201016019/quicklook/glg_lc_medres34_bn201016019.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 52.45,25.48 [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 16 Oct 20 00:28:15 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      49
TRIGGER_NUM:     624500874
GRB_RA:          178.350d {+11h 53m 24s} (J2000),
                 178.617d {+11h 54m 28s} (current),
                 177.709d {+11h 50m 50s} (1950)
GRB_DEC:          +2.417d {+02d 25' 00"} (J2000),
                  +2.301d {+02d 18' 04"} (current),
                  +2.695d {+02d 41' 42"} (1950)
GRB_ERROR:       7.70 [deg radius, statistical plus systematic]
GRB_INTEN:       453 [cnts/sec]
DATA_SIGNIF:     13.20 [sigma]
INTEG_TIME:      0.512 [sec]
GRB_DATE:        19138 TJD;   290 DOY;   20/10/16
GRB_TIME:        1669.59 SOD {00:27:49.59} UT
GRB_PHI:         340.00 [deg]
GRB_THETA:        90.00 [deg]
DATA_TIME_SCALE: 0.5120 [sec]
HARD_RATIO:      1.54
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      68%  Solar Flare
2nd_MOST_LIKELY:  26%  GRB
DETECTORS:       0,0,0, 1,1,1, 0,0,0, 0,0,0, 0,0,
SUN_POSTN:       201.38d {+13h 25m 32s}   -8.98d {-08d 58' 50"}
SUN_DIST:         25.34 [deg]   Sun_angle= 1.5 [hr] (West of Sun)
MOON_POSTN:      192.48d {+12h 49m 56s}   -0.22d {-00d 13' 04"}
MOON_DIST:        14.09 [deg]
MOON_ILLUM:      1 [%]
GAL_COORDS:      271.12, 61.65 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      177.52,  1.56 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn201016019/quicklook/glg_lc_medres34_bn201016019.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 52.45,25.48 [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 16 Oct 20 00:28:36 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      71
TRIGGER_NUM:     624500874
GRB_RA:          174.800d {+11h 39m 12s} (J2000),
                 175.066d {+11h 40m 16s} (current),
                 174.161d {+11h 36m 39s} (1950)
GRB_DEC:          -3.967d {-03d 58' 00"} (J2000),
                  -4.082d {-04d 04' 54"} (current),
                  -3.690d {-03d 41' 22"} (1950)
GRB_ERROR:       3.28 [deg radius, statistical plus systematic]
GRB_INTEN:       14590 [cnts/sec]
DATA_SIGNIF:     896.70 [sigma]
INTEG_TIME:      2.048 [sec]
GRB_DATE:        19138 TJD;   290 DOY;   20/10/16
GRB_TIME:        1669.59 SOD {00:27:49.59} UT
GRB_PHI:         335.00 [deg]
GRB_THETA:        95.00 [deg]
DATA_TIME_SCALE: 2.0480 [sec]
HARD_RATIO:      0.65
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      96%  GRB
2nd_MOST_LIKELY:   3%  Generic Transient
DETECTORS:       0,0,0, 1,1,1, 0,0,0, 0,0,0, 0,0,
SUN_POSTN:       201.38d {+13h 25m 32s}   -8.98d {-08d 58' 50"}
SUN_DIST:         26.59 [deg]   Sun_angle= 1.8 [hr] (West of Sun)
MOON_POSTN:      192.49d {+12h 49m 56s}   -0.22d {-00d 13' 09"}
MOON_DIST:        17.83 [deg]
MOON_ILLUM:      1 [%]
GAL_COORDS:      270.89, 54.35 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      176.81, -5.71 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn201016019/quicklook/glg_lc_medres34_bn201016019.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 52.45,25.48 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.

GCN NOTICE

TITLE:          GCN/INTEGRAL NOTICE
NOTICE_DATE:    Fri 16 Oct 20 00:28:50 UT 
NOTICE_TYPE:    INTEGRAL SPI ACS Trigger
TRIGGER_NUM:    8760,   Sub_Num: 0
GRB_INTEN:      11.39 [sigma]
GRB_TIME:       1673.87 SOD {00:27:53.87} UT
GRB_DATE:       19138 TJD;   290 DOY;   20/10/16
COMMENTS:       INTEGRAL SPI_ACS GRB Trigger.
COMMENTS:       Time_Scale=2.0000 and Time_Error=1.0000.
COMMENTS:
COMMENTS:       NOTE: This SPIACS event is temporally(4.0<100sec) coincident with the FERMI_GBM event (trignum=624500874). 
COMMENTS:
COMMENTS:       The SPIACS lightcurve can be found at:
COMMENTS:       ftp://isdcarc.unige.ch/arc/FTP/ibas/spiacs/2020-10/2020-10-16T00-27-53.7184-01477-39824-0.lc

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Fri 16 Oct 20 00:29:22 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      0
TRIGGER_NUM:     624500874
GRB_RA:          176.220d {+11h 44m 53s} (J2000),
                 176.486d {+11h 45m 57s} (current),
                 175.580d {+11h 42m 19s} (1950)
GRB_DEC:          -1.330d {-01d 19' 47"} (J2000),
                  -1.446d {-01d 26' 43"} (current),
                  -1.052d {-01d 03' 07"} (1950)
GRB_ERROR:       1.96 [deg radius, statistical only]
DATA_SIGNIF:     43.20 [sigma]
DATA_INTERVAL:   5.120 [sec]
GRB_DATE:        19138 TJD;   290 DOY;   20/10/16
GRB_TIME:        1669.59 SOD {00:27:49.59} UT
GRB_PHI:         337.00 [deg]
GRB_THETA:        93.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   41731 (Gnd S/W Version number)
SUN_POSTN:       201.38d {+13h 25m 32s}   -8.98d {-08d 58' 51"}
SUN_DIST:         25.90 [deg]   Sun_angle= 1.7 [hr] (West of Sun)
MOON_POSTN:      192.49d {+12h 49m 58s}   -0.22d {-00d 13' 21"}
MOON_DIST:        16.05 [deg]
MOON_ILLUM:      1 [%]
GAL_COORDS:      270.89, 57.34 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      177.06, -2.72 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn201016019/quicklook/glg_lc_medres34_bn201016019.gif
POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_624500874.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 INTEGRAL_SPIACS event (trignum=8760).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Fri 16 Oct 20 00:29:32 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      2
TRIGGER_NUM:     624500874
GRB_RA:          175.250d {+11h 41m 00s} (J2000),
                 175.516d {+11h 42m 04s} (current),
                 174.610d {+11h 38m 26s} (1950)
GRB_DEC:          -1.620d {-01d 37' 11"} (J2000),
                  -1.735d {-01d 44' 06"} (current),
                  -1.343d {-01d 20' 33"} (1950)
GRB_ERROR:       1.00 [deg radius, statistical only]
DATA_SIGNIF:     561.90 [sigma]
DATA_INTERVAL:   7.168 [sec]
GRB_DATE:        19138 TJD;   290 DOY;   20/10/16
GRB_TIME:        1669.59 SOD {00:27:49.59} UT
GRB_PHI:         336.00 [deg]
GRB_THETA:        93.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   41731 (Gnd S/W Version number)
SUN_POSTN:       201.38d {+13h 25m 32s}   -8.98d {-08d 58' 51"}
SUN_DIST:         26.74 [deg]   Sun_angle= 1.7 [hr] (West of Sun)
MOON_POSTN:      192.49d {+12h 49m 59s}   -0.22d {-00d 13' 24"}
MOON_DIST:        17.04 [deg]
MOON_ILLUM:      1 [%]
GAL_COORDS:      269.59, 56.62 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      176.28, -3.37 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn201016019/quicklook/glg_lc_medres34_bn201016019.gif
POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_624500874.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 INTEGRAL_SPIACS event (trignum=8760).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Fri 16 Oct 20 00:37:20 UT
NOTICE_TYPE:     Fermi-GBM Final Position
RECORD_NUM:      0
TRIGGER_NUM:     624500874
GRB_RA:          174.300d {+11h 37m 12s} (J2000),
                 174.566d {+11h 38m 16s} (current),
                 173.660d {+11h 34m 38s} (1950)
GRB_DEC:          -1.960d {-01d 57' 35"} (J2000),
                  -2.075d {-02d 04' 30"} (current),
                  -1.683d {-01d 40' 58"} (1950)
GRB_ERROR:       1.00 [deg radius, statistical only]
GRB_DATE:        19138 TJD;   290 DOY;   20/10/16
GRB_TIME:        1669.59 SOD {00:27:49.59} UT
GRB_PHI:         335.00 [deg]
GRB_THETA:        93.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   41731 (Gnd S/W Version number)
SUN_POSTN:       201.39d {+13h 25m 33s}   -8.98d {-08d 58' 58"}
SUN_DIST:         27.56 [deg]   Sun_angle= 1.8 [hr] (West of Sun)
MOON_POSTN:      192.57d {+12h 50m 17s}   -0.26d {-00d 15' 27"}
MOON_DIST:        18.09 [deg]
MOON_ILLUM:      1 [%]
GAL_COORDS:      268.41, 55.85 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      175.55, -4.06 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn201016019/quicklook/glg_lc_medres34_bn201016019.gif
LOC_URL:         http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn201016019/quicklook/glg_locplot_all_bn201016019.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 INTEGRAL_SPIACS event (trignum=8760).

GCN Circular #28636
The Fermi GBM team reports the detection of a likely LONG GRB
At 00:27:49 UT on 16 Oct 2020, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 201016A (trigger 624500874.592646 / 201016019).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 174.3, Dec = -2.0 (J2000 degrees, equivalent to J2000 11h 37m, -2d 00'), with a statistical uncertainty of 1.0 degrees.
The angle from the Fermi LAT boresight is 93.0 degrees.
The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn201016019/quicklook/glg_skymap_all_bn201016019.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/bn201016019/quicklook/glg_healpix_all_bn201016019.fit
The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn201016019/quicklook/glg_lc_medres34_bn201016019.gif
GCN Circular #28641
B. Biltzinger, F. Kunzweiler, F. Berlato, J. Burgess & J. Greiner (all MPE Garching) report:
The public trigdat data of the Fermi Gamma-ray Burst Monitor (GBM) trigger 624500874 at 00:27:49 on 16 Oct. 2020 were automatically fitted for spectrum and sky location with BALROG (Burgess et al. 2018, MNRAS 476, 1427; Berlato et al. 2019, ApJ 873, 60).
The best-fit position (1 sigma statistical errors) is:
```
RA(2000.0) = 176.6+/-0.1 deg
Decl.(2000.0) = -4.3+/-0.2 deg
```
We estimate an additional systematic error of 1 deg.
Further details are available at: https://grb.mpe.mpg.de/grb/GRB201016019/
The Healpix map can be downloaded from: https://grb.mpe.mpg.de/grb/GRB201016019/healpix
The location parameters are available as JSON at: https://grb.mpe.mpg.de/grb/GRB201016019/json
GCN Circular #28646
J. Wood (NASA/MSFC) and C. Meegan (UAH) report on behalf of the Fermi GBM Team:
"At 00:27:49.59 UT on 16 October 2020, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 201016A (trigger 624500874 / 201016019).
The on-ground calculated location, using the GBM trigger data, is RA = 174.3, DEC = -2.0 (J2000 degrees, equivalent to 11h 37m, -2d 00'), with an uncertainty of 1.0 degrees (radius, 1-sigma containment, statistical only; there is additionally a systematic error which we have characterized as a mixture of two Gaussians, one with a radius of 1.8 degrees (52% contribution) and one with a radius of 4.1 degrees (47% contribution) [A. Goldstein et al. 2020, ApJ, 895, 1] ).
The angle from the Fermi LAT boresight at the GBM trigger time is 93 degrees.
The GBM light curve consists of multiple pulses with a duration (T90) of about 3 s (50-300 keV). The time-averaged spectrum from T0+6.3 s to T0+9.4 s is best fit by a Band function with Epeak = 181 +/- 2 keV, alpha = -0.42 +/- 0.01, and beta = -2.75 +/- 0.03
The event fluence (10-1000 keV) in this time interval is (9.06 +/- 0.04)E-05 erg/cm^2. The 1.024-sec peak photon flux measured starting from T0+6.8 s in the 10-1000 keV band is 267.4 +/- 1.1 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 #28651
S. Gupta, V. Sharma and D. Bhattacharya (IUCAA), V. Bhalerao (IIT-B), A. R. Rao (IUCAA/TIFR) and S. Vadawale (PRL) report on behalf of the AstroSat CZTI collaboration:
Analysis of AstroSat CZTI data showed detection of a bright long GRB 201016A, which was also detected by Fermi GBM Final Real-time (GCN #28636), BALROG (Biltzinger B. et al., GCN #28641) and Fermi GBM (Wood J. et al., GCN #28646).
The source was clearly detected in the 40-200 keV energy range. The light curve showed multiple peaks of emission with the strongest peak at 2020-10-16 00:27:56.500 UT. The measured peak count rate associated with the burst is 4218 +/- 68 cts/s above the background in the combined data of four quadrants, with a total of 8601 +/- 8 cts. The local mean background count rate was 488 +/- 1 cts/s. Using cumulative rates, we measure a T90 of 2.91 +/- 0.01 s.
It was also clearly detected in the CsI anticoincidence (Veto) detector in the 100-500 keV energy range. The light curve showed multiple peaks of emission with the strongest peak at 2020-10-16 00:27:56.000 UT. The measured peak count rate is 6766 +/- 89 cts/s above the background in the combined Veto data of four quadrants, with a total of 14638 +/- 12 cts. The local mean background count rate was 1422 +/- 1 cts/s. We measure a T90 of 3.05 +/- 0.01 s from the cumulative Veto light curve.
CZTI GRB detections are reported regularly on the payload site at http://astrosat.iucaa.in/czti/?q=grb CZTI is built by a TIFR-led consortium of institutes across India, including VSSC, ISAC, IUCAA, SAC and PRL. The Indian Space Research Organisation funded, managed and facilitated the project.
GCN Circular #28694
C. Cai, C. Zheng, J. C. Liu, Q. Luo, S. Xiao, W. C. Xue, Q. B. Yi, Y. Q. Zhang, Y. Huang, C. K. Li, G. Li, X. B. Li, J. Y. Liao, X. Y. Song, S. L. Xiong, C. Z. Liu, X. F. Li, Z. W. Li, Z. Chang, A. M. Zhang, Y. F. Zhang, X. F. Lu, C. L. Zou (IHEP), Y. J. Jin, Z. Zhang (THU), T. P. Li (IHEP/THU), F. J. Lu, L. M. Song, M. Wu, Y. P. Xu, S. N. Zhang (IHEP), report on behalf of the Insight-HXMT team:
At 2020-10-16T00:27:49.500 (T0), Insight-HXMT/HE detected GRB 201016A (trigger ID: HEB201016019) in a routine search of the data, which also triggered Fermi/GBM (Wood J. et al., GCN #28646) and AstroSat/CZTI (Gupta S. et al., GCN #28651).
The Insight-HXMT/HE light curve mainly consists of multiple pulses with a duration (T90) of 3.36 s measured from T0+6.06 s. The 1-ms peak rate, measured from T0+7.47 s, is 20372 cnts/sec. The total counts from this burst is 57956 counts. URL_LC: http://twiki.ihep.ac.cn/pub/HXMT/GRBList/HEB201016019_lc.jpg
All measurements above are made with the CsI detectors operating in the regular mode with the energy range of about 80-800 keV (deposited energy). Only gamma-rays with energy greater than about 200 keV can penetrate the spacecraft and leave signals in the CsI detectors installed inside of the telescope.
Insight-HXMT is the first Chinese space X-ray telescope, which was funded jointly by the China National Space Administration (CNSA) and the Chinese Academy of Sciences (CAS). More information about it could be found at: http://www.hxmt.org.

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Jochen Greiner, last update: 20-Oct-2020 [Disclaimer]