Gamma-ray Burst 200311A

(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:     Wed 11 Mar 20 15:16:47 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      60
TRIGGER_NUM:     605632577
GRB_RA:          166.550d {+11h 06m 12s} (J2000),
                 166.773d {+11h 07m 06s} (current),
                 165.999d {+11h 04m 00s} (1950)
GRB_DEC:         -53.783d {-53d 46' 59"} (J2000),
                 -53.893d {-53d 53' 33"} (current),
                 -53.513d {-53d 30' 45"} (1950)
GRB_ERROR:       6.08 [deg radius, statistical plus systematic]
GRB_INTEN:       1008 [cnts/sec]
DATA_SIGNIF:     41.10 [sigma]
INTEG_TIME:      4.096 [sec]
GRB_DATE:        18919 TJD;    71 DOY;   20/03/11
GRB_TIME:        54972.93 SOD {15:16:12.93} UT
GRB_PHI:         255.00 [deg]
GRB_THETA:       145.00 [deg]
DATA_TIME_SCALE: 4.0960 [sec]
HARD_RATIO:      0.39
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      96%  GRB
2nd_MOST_LIKELY:   3%  Generic Transient
DETECTORS:       0,0,0, 0,1,0, 0,0,1, 0,0,0, 0,0,
SUN_POSTN:       352.20d {+23h 28m 49s}   -3.36d {-03d 21' 51"}
SUN_DIST:        122.56 [deg]   Sun_angle= -11.6 [hr] (East of Sun)
MOON_POSTN:      198.98d {+13h 15m 54s}   -2.76d {-02d 45' 40"}
MOON_DIST:        57.52 [deg]
MOON_ILLUM:      95 [%]
GAL_COORDS:      287.67,  5.94 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      198.73,-52.64 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200311636/quicklook/glg_lc_medres34_bn200311636.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 253.62,-23.68 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Wed 11 Mar 20 15:16:36 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      49
TRIGGER_NUM:     605632577
GRB_RA:          175.367d {+11h 41m 28s} (J2000),
                 175.614d {+11h 42m 27s} (current),
                 174.756d {+11h 39m 01s} (1950)
GRB_DEC:         -51.550d {-51d 32' 59"} (J2000),
                 -51.662d {-51d 39' 42"} (current),
                 -51.273d {-51d 16' 20"} (1950)
GRB_ERROR:       4.08 [deg radius, statistical plus systematic]
GRB_INTEN:       1236 [cnts/sec]
DATA_SIGNIF:     26.80 [sigma]
INTEG_TIME:      1.024 [sec]
GRB_DATE:        18919 TJD;    71 DOY;   20/03/11
GRB_TIME:        54972.93 SOD {15:16:12.93} UT
GRB_PHI:         250.00 [deg]
GRB_THETA:       140.00 [deg]
DATA_TIME_SCALE: 1.0240 [sec]
HARD_RATIO:      0.43
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      95%  GRB
2nd_MOST_LIKELY:   4%  Generic Transient
DETECTORS:       0,0,0, 0,1,0, 0,0,1, 0,0,0, 0,0,
SUN_POSTN:       352.20d {+23h 28m 49s}   -3.36d {-03d 21' 51"}
SUN_DIST:        124.90 [deg]   Sun_angle= 11.8 [hr] (West of Sun)
MOON_POSTN:      198.97d {+13h 15m 54s}   -2.76d {-02d 45' 37"}
MOON_DIST:        52.66 [deg]
MOON_ILLUM:      95 [%]
GAL_COORDS:      292.00,  9.83 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      203.18,-47.60 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200311636/quicklook/glg_lc_medres34_bn200311636.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 253.62,-23.68 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Wed 11 Mar 20 15:16:53 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      59
TRIGGER_NUM:     605632577
GRB_RA:          202.760d {+13h 31m 02s} (J2000),
                 203.062d {+13h 32m 15s} (current),
                 202.015d {+13h 28m 04s} (1950)
GRB_DEC:         -44.620d {-44d 37' 11"} (J2000),
                 -44.724d {-44d 43' 24"} (current),
                 -44.363d {-44d 21' 44"} (1950)
GRB_ERROR:       1.00 [deg radius, statistical only]
DATA_SIGNIF:     58.90 [sigma]
DATA_INTERVAL:   4.096 [sec]
GRB_DATE:        18919 TJD;    71 DOY;   20/03/11
GRB_TIME:        54972.93 SOD {15:16:12.93} UT
GRB_PHI:         245.00 [deg]
GRB_THETA:       121.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   4173 (Gnd S/W Version number)
SUN_POSTN:       352.20d {+23h 28m 49s}   -3.36d {-03d 21' 51"}
SUN_DIST:        124.58 [deg]   Sun_angle= 9.9 [hr] (West of Sun)
MOON_POSTN:      198.98d {+13h 15m 55s}   -2.76d {-02d 45' 42"}
MOON_DIST:        42.12 [deg]
MOON_ILLUM:      95 [%]
GAL_COORDS:      310.31, 17.68 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      219.03,-32.34 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200311636/quicklook/glg_lc_medres34_bn200311636.gif
POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_605632577.fits
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        Bright hard burst in the GBM.  
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:     Wed 11 Mar 20 15:23:22 UT
NOTICE_TYPE:     Fermi-GBM Final Position
RECORD_NUM:      0
TRIGGER_NUM:     605632577
GRB_RA:          203.990d {+13h 35m 58s} (J2000),
                 204.303d {+13h 37m 13s} (current),
                 203.219d {+13h 32m 52s} (1950)
GRB_DEC:         -49.680d {-49d 40' 47"} (J2000),
                 -49.783d {-49d 46' 56"} (current),
                 -49.425d {-49d 25' 29"} (1950)
GRB_ERROR:       1.00 [deg radius, statistical only]
GRB_DATE:        18919 TJD;    71 DOY;   20/03/11
GRB_TIME:        54972.93 SOD {15:16:12.93} UT
GRB_PHI:         251.00 [deg]
GRB_THETA:       122.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   41731 (Gnd S/W Version number)
SUN_POSTN:       352.21d {+23h 28m 50s}   -3.36d {-03d 21' 44"}
SUN_DIST:        120.08 [deg]   Sun_angle= 9.9 [hr] (West of Sun)
MOON_POSTN:      199.04d {+13h 16m 10s}   -2.79d {-02d 47' 18"}
MOON_DIST:        47.21 [deg]
MOON_ILLUM:      95 [%]
GAL_COORDS:      310.28, 12.56 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      222.66,-36.50 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200311636/quicklook/glg_lc_medres34_bn200311636.gif
LOC_URL:         http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200311636/quicklook/glg_locplot_all_bn200311636.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:        Bright hard burst in the GBM.  
COMMENTS:        This is likely a Long GRB.  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(1.0<100sec) coincident with the INTEGRAL_SPIACS event (trignum=8534).

GCN Circular #27363
The Fermi GBM team reports the detection of a likely LONG GRB
At 15:16:12 UT on 11 Mar 2020, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 200311A (trigger 605632577.928052 / 200311636).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 204.0, Dec = -49.7 (J2000 degrees, equivalent to J2000 13h 35m, -49d 42'), with a statistical uncertainty of 1.0 degrees.
The angle from the Fermi LAT boresight is 122.0 degrees.
The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200311636/quicklook/glg_skymap_all_bn200311636.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/bn200311636/quicklook/glg_healpix_all_bn200311636.fit
The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200311636/quicklook/glg_lc_medres34_bn200311636.gif
GCN Circular #27365
A. Ursi (INAF/IAPS), F. Longo (Univ. Trieste and INFN Trieste), M. Pilia (INAF/OA-Cagliari), C. Pittori, F. Verrecchia (SSDC, and INAF/OAR), M. Tavani (INAF/IAPS, and Univ. Roma Tor Vergata), A. Argan, M. Cardillo, C. Casentini, Y. Evangelista, G. Piano (INAF/IAPS), F. Lucarelli (SSDC, and INAF/OAR), A. Bulgarelli, V. Fioretti, F. Fuschino, N. Parmiggiani (INAF/OAS-Bologna), M. Marisaldi (INAF/OAS-Bologna, and Bergen University), A. Trois (INAF/OA-Cagliari), I. Donnarumma (ASI), A. Giuliani (INAF/IASF-Mi), report on behalf of the AGILE Team:
The AGILE satellite detected the long burst GRB 200311A reported by Fermi/GBM (GCN #27363), that also triggered the automatic AGILE Mini-CALorimeter (MCAL) GRB alert Notice (ID 511024575), published at: https://gcn.gsfc.nasa.gov/agile_mcal.html.
The event is visible in the scientific ratemeters (RMs) of the Anti-Coincidence (AC, 50-200 keV) and MCAL (0.4-100 MeV) detectors. The burst light curve shows a multi-peaked profile, lasting ~25 s and releasing ~33000 counts in the MCAL RMs. The ratemeters light curves can be found at http://www.agilescienceapp.it/notices/GRB_066883_511024575.756958_RM.png.
The event also triggered an MCAL data acquisition at T0 = 2020-03-11 15:16:15.75 +/- 0.01 s (UTC), lasting ~10 s and releasing a total number of ~7550 counts in the detector, above a background rate of ~700 Hz. The MCAL light curve can be found at: http://www.agilescienceapp.it/notices/GRB_066883_511024575.756958.png.
The AGILE-MCAL detector is a CsI detector with a 4 pi FoV, sensitive in the energy range 0.4-100 MeV. Additional analysis of AGILE data is in progress.
GCN Circular #27371
S. Gupta, V. Sharma, A. Vibhute and D. Bhattacharya (IUCAA), V. Bhalerao (IIT-B), A. R. Rao (TIFR) and S. Vadawale (PRL) report on behalf of the AstroSat CZTI collaboration:
Analysis of AstroSat CZTI data showed the detection of a GRB 200311A, which was also detected by Fermi GBM (GCN #27363), AGILE/MCAL (Ursi A. et al., GCN #27365) and Global MASTER-Net (Lipunov V. et al., GCN #27370).
The source was clearly detected in the 40-200 keV energy range. The light curve shows multiple peaks of emission with the strongest peak at 2020-03-11 15:16:13.516 UT. The measured peak count rate associated with the burst is 958 +/- 38.4 cts/s above the background in the combined data of four quadrants, with a total of 10660 +/- 42.9 cts. The local mean background count rate was 532 +/- 1.0 cts/s. Using cumulative rates, we measure a T90 of 30.5 +/- 0.03 s. In preliminary analysis, we find that 1186 Compton events are associated with this event.
It was also clearly detected in the CsI anticoincidence (Veto) detector in the 100-500 keV energy range.
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 #27381
D. Svinkin, S. Golenetskii, R. Aptekar, D. Frederiks, A. Ridnaia, and T. Cline on behalf of the Konus-Wind team,
K. Hurley, on behalf of the IPN,
A. Goldstein, M. S. Briggs, and C. Wilson-Hodge on behalf of the Fermi GBM team, and
A. von Kienlin, X. Zhang, A. Rau, V. Savchenko, E. Bozzo, and C. Ferrigno, on behalf of the INTEGRAL SPI-ACS GRB team, report:
The long-duration GRB 200311A (Fermi-GBM detection: The Fermi GBM team, GCN Circ. 27363; AGILE-MCAL detection: Ursi et al., GCN Circ. 27365; AstroSat-CZTI detection: Gupta et al., GCN Circ. 27371) was detected by Fermi (GBM trigger 605632577), Konus-Wind, INTEGRAL (SPI-ACS), AGILE-MCAL, and AstroSat-CZTI at about 54973 s UT (15:16:13).
We have triangulated it to a preliminary, 3 sigma error box whose coordinates are:
```
  ---------------------------------------------
   RA(2000), deg                 Dec(2000), deg
  ---------------------------------------------
  Center:
   209.245 (13h 56m 59s) -50.054 (-50d 03' 15")
  Corners:
   206.898 (13h 47m 35s) -52.496 (-52d 29' 46")
   211.898 (14h 07m 35s) -47.578 (-47d 34' 42")
   211.296 (14h 05m 11s) -47.578 (-47d 34' 39")
   206.215 (13h 44m 52s) -52.473 (-52d 28' 23")
  ---------------------------------------------
```
The error box area is 2.0 sq. deg, and its maximum dimension is 6.1 deg (the minimum one is 21 arcmin). The Sun distance was 117 deg.
This box may be improved.
The IPN localization is consistent with, but reduces the area of, the Fermi-GBM final position (GCN Circ. 27363).
A triangulation map is posted at http://www.ioffe.ru/LEA/GRBs/GRB200311_T54974/IPN
The Konus-Wind time history and spectrum will be given in a forthcoming GCN Circular.
GCN Circular #27398
A. Ridnaia, S. Golenetskii, R. Aptekar, D. Frederiks, M. Ulanov, D. Svinkin, A. Tsvetkova, A. Lysenko, and T. Cline on behalf of the Konus-Wind team, report:
The long-duration GRB 200311A (Fermi-GBM detection: The Fermi GBM team, GCN Circ. 27363; AGILE-MCAL detection: Ursi et al., GCN Circ. 27365; AstroSat-CZTI detection: Gupta et al., GCN Circ. 27371; IPN triangulation: Svinkin et al., GCN Circ. 27381) triggered Konus-Wind at T0=54974.737 s UT (15:16:14.737).
The burst light curve shows a multipeaked structure which starts at ~T0-0.8 s and has a total duration of ~65.2 s. The emission is seen up to ~8 MeV.
As observed by Konus-Wind, the burst had a fluence of 8.84(-0.76,+0.89)x10^-5 erg/cm2, and a 64-ms peak flux, measured from T0+1.792 s, of 1.56(-0.28,+0.28)x10^-5 erg/cm2/s (both in the 20 keV - 10 MeV energy range).
The time-averaged spectrum of the burst (measured from T0 to T0+64.512 s) is best fit in the 20 keV - 8 MeV range by a power law with exponential cutoff model: dN/dE ~ (E^alpha)*exp(-E*(2+alpha)/Ep) with alpha = -0.93(-0.07,+0.08) and Ep = 854(-112,+142) keV (chi2 = 113/81 dof). Fitting by a GRB (Band) model yields the same alpha and Ep, and an upper limit on the high energy photon index: beta < -2.1 (chi2 = 112/80 dof).
The spectrum near the maximum count rate (measured from T0+0.256 to T0+7.168 s) is best fit in the 20 keV - 8 MeV range by a power law with exponential cutoff model with alpha = -0.57(-0.08,+0.09) and Ep = 957(-98,+114) keV (chi2 = 88/80 dof). Fitting by a GRB (Band) model yields the same alpha and Ep, and an upper limit on the high energy photon index: beta < -2.2 (chi2 = 86/79 dof).
The Konus-Wind light curve of this GRB is available at http://www.ioffe.ru/LEA/GRBs/GRB200311_T54974/
All the quoted errors are at the 90% confidence level. All the quoted values are preliminary.

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Jochen Greiner, last update: 10-Apr-2020 [Disclaimer]