Gamma-ray Burst 220305B

(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:     Sat 05 Mar 22 11:33:45 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      44
TRIGGER_NUM:     668172805
GRB_RA:          191.933d {+12h 47m 44s} (J2000),
                 192.238d {+12h 48m 57s} (current),
                 191.249d {+12h 45m 00s} (1950)
GRB_DEC:         -38.133d {-38d 07' 59"} (J2000),
                 -38.254d {-38d 15' 13"} (current),
                 -37.861d {-37d 51' 37"} (1950)
GRB_ERROR:       23.90 [deg radius, statistical plus systematic]
GRB_INTEN:       62 [cnts/sec]
DATA_SIGNIF:     4.50 [sigma]
INTEG_TIME:      4.096 [sec]
GRB_DATE:        19643 TJD;    64 DOY;   22/03/05
GRB_TIME:        41600.48 SOD {11:33:20.48} UT
GRB_PHI:         132.98 [deg]
GRB_THETA:        40.00 [deg]
DATA_TIME_SCALE: 4.0960 [sec]
HARD_RATIO:      1.52
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      60%  Distant Particles
2nd_MOST_LIKELY:  33%  GRB
DETECTORS:       0,0,0, 0,0,0, 0,0,0, 1,0,1, 0,0,
SUN_POSTN:       346.07d {+23h 04m 17s}   -5.96d {-05d 57' 24"}
SUN_DIST:        129.55 [deg]   Sun_angle= 10.3 [hr] (West of Sun)
MOON_POSTN:       18.79d {+01h 15m 10s}   +4.82d {+04d 48' 58"}
MOON_DIST:       146.03 [deg]
MOON_ILLUM:      9 [%]
GAL_COORDS:      302.13, 24.73 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      207.16,-30.12 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2022/bn220305481/quicklook/glg_lc_medres34_bn220305481.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 131.32,-19.48 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Sat 05 Mar 22 13:19:55 UT
NOTICE_TYPE:     Fermi-GBM Final Position
RECORD_NUM:      0
TRIGGER_NUM:     668172805
GRB_RA:          163.410d {+10h 53m 38s} (J2000),
                 163.667d {+10h 54m 40s} (current),
                 162.832d {+10h 51m 20s} (1950)
GRB_DEC:         -37.880d {-37d 52' 47"} (J2000),
                 -37.998d {-37d 59' 53"} (current),
                 -37.613d {-37d 36' 48"} (1950)
GRB_ERROR:       2.15 [deg radius, statistical only]
GRB_DATE:        19643 TJD;    64 DOY;   22/03/05
GRB_TIME:        41600.48 SOD {11:33:20.48} UT
GRB_PHI:         168.68 [deg]
GRB_THETA:        30.12 [deg]
E_RANGE:         50.000 - 300.000 [keV]
LOC_ALGORITHM:   415 (Gnd S/W Version number)
SUN_POSTN:       346.14d {+23h 04m 33s}   -5.93d {-05d 55' 41"}
SUN_DIST:        136.01 [deg]   Sun_angle= -11.8 [hr] (East of Sun)
MOON_POSTN:       19.65d {+01h 18m 36s}   +5.24d {+05d 14' 16"}
MOON_DIST:       133.72 [deg]
MOON_ILLUM:      9 [%]
GAL_COORDS:      278.64, 19.37 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      182.84,-40.77 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2022/bn220305481/quicklook/glg_lc_medres34_bn220305481.gif
LOC_URL:         http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2022/bn220305481/quicklook/glg_locplot_all_bn220305481.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(45.0<100sec) coincident with the INTEGRAL_SPIACS event (trignum=9754).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Sat 05 Mar 22 13:28:48 UT
NOTICE_TYPE:     Fermi-GBM Final Position
RECORD_NUM:      0
TRIGGER_NUM:     668172805
GRB_RA:          174.410d {+11h 37m 38s} (J2000),
                 174.686d {+11h 38m 45s} (current),
                 173.789d {+11h 35m 09s} (1950)
GRB_DEC:         -34.040d {-34d 02' 23"} (J2000),
                 -34.163d {-34d 09' 45"} (current),
                 -33.763d {-33d 45' 46"} (1950)
GRB_ERROR:       1.54 [deg radius, statistical only]
GRB_DATE:        19643 TJD;    64 DOY;   22/03/05
GRB_TIME:        41600.48 SOD {11:33:20.48} UT
GRB_PHI:         156.26 [deg]
GRB_THETA:        37.00 [deg]
E_RANGE:         50.000 - 300.000 [keV]
LOC_ALGORITHM:   415 (Gnd S/W Version number)
SUN_POSTN:       346.14d {+23h 04m 35s}   -5.93d {-05d 55' 32"}
SUN_DIST:        139.11 [deg]   Sun_angle= 11.4 [hr] (West of Sun)
MOON_POSTN:       19.72d {+01h 18m 54s}   +5.27d {+05d 16' 23"}
MOON_DIST:       142.95 [deg]
MOON_ILLUM:      9 [%]
GAL_COORDS:      285.91, 26.38 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      190.21,-33.07 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2022/bn220305481/quicklook/glg_lc_medres34_bn220305481.gif
LOC_URL:         http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2022/bn220305481/quicklook/glg_locplot_all_bn220305481.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(51.0<100sec) coincident with the KONUS event (trignum=1964341651).

GCN Circular #31689
R. Dunwoody (UCD), J. Mangan (UCD) and C.Meegan (UAH) report on behalf of the Fermi GBM Team:
"At 11:33:20.48 UT on 05 March 2022, the Fermi Gamma-Ray Burst Monitor (GBM) triggered and located GRB 220305A (trigger 668172805 / 220305481).
The on-ground calculated location, using the GBM trigger data, is RA = 174, DEC = -34 (J2000 degrees, equivalent to 11 h 36 m, -34 d 00 '), with a statistical uncertainty of 1.5 degrees.
The angle from the Fermi LAT boresight at the GBM trigger time is 35 degrees.
The GBM light curve consists of three emission episodes, the most prominent occurring around T0+50s, with a duration (T90) of about 172.8 s (50-300 keV).
The time-averaged spectrum for the first emission episode, from T0-12.3 to T0+12.3, is best fit by a power law function with an exponential high-energy cutoff. The power law index is -0.6 +/- 0.5 and the cutoff energy, parameterized as Epeak, is 60.9 +/- 9.1 keV. The event fluence (10-1000 keV) in this time interval is (6.8 +/- 0.8)E-07 erg/cm^2.
The time-averaged spectrum for the second emission episode, from T0+39.9 to T0+60.4, is best fit by a Band function with Epeak = 320.7 +/- 35.7 keV, alpha = -0.9 +/- 0.1, and beta = -1.9 +/- 0.1. The event fluence (10-1000 keV) in this time interval is (1.78 +/- 0.03)E-05.
The time-averaged spectrum for the third emission episode, from T0+164.9 to T0+193.5, is best fit by a power law function with an exponential high-energy cutoff. The power law index is -1.3 +/- 0.1 and the cutoff energy, parameterized as Epeak, is 205.2 +/- 42.8 keV. The event fluence (10-1000 keV) in this time interval is(3.5 +/- 0.3)E-06 erg/cm^2.
The 1-sec peak photon flux measured starting from T0+49.6 s in the 10-1000 keV band is 19.5 +/- 0.4 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 #31691
V. Lipunov, V.Kornilov, E.Gorbovskoy, K.Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, D. Vlasenko, G.Antipov, D.Zimnukhov, V.Senik, T.Pogrosheva, E.Minkina, A.Chasovnikov, V.Topolev, V.Grinshpun, 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 (Irkutsk State University, API),
B.L.Carrasco, J.R.Valdes,V.Chavushyan, C.J.Martinez, V.M.Patino Alvarez, M.L.H.Rodriguez (INAOE, OAGH)
A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory),
A. Gabovich, V.Yurkov (Blagoveschensk Educational State University)
MASTER-OAFA robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Argentina (OAFA observatory of San Juan National University) started inspect of the Fermi GRB 220305A ( R. Dunwoody et al., GCN 31689) errorbox 56245 sec after notice time and 56274 sec after trigger time at 2022-03-06 03:11:15 UT, with upper limit up to 18.3 mag. The observations began at zenith distance = 25 deg. The sun altitude is -46.7 deg.
The galactic latitude b = 26 deg., longitude l = 287 deg.
Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=1902853
We obtain a following upper limits.
```
Tmid-T0  |      Date Time      |          Site       |             Coord (J2000)          |Filt.| Expt. | Limit| Comment
_________|_____________________|_____________________|____________________________________|_____|_______|_______|________

   56305 | 2022-03-06 03:11:15 |         MASTER-OAFA | (11h 29m 45.56s , -35d 27m 42.1s) |   C |    60 | 15.9 |        
   58403 | 2022-03-06 03:46:13 |         MASTER-OAFA | (11h 29m 45.60s , -35d 28m 47.3s) |   C |    60 | 18.3 |        
```
Filter C is a clear (unfiltred) band.
The observation and reduction will continue. The message may be cited.
GCN Circular #31713
A.S. Kozyrev, D.V. Golovin, M.L. Litvak, I.G. Mitrofanov, and A.B. Sanin on behalf of the HEND/Mars-Odyssey team,
A. Ridnaia, D. Frederiks, D. Svinkin, A. Lysenko, and T. Cline on behalf of the Konus-Wind team,
A. Goldstein, M. S. Briggs, and C. Wilson-Hodge on behalf of the Fermi GBM team,
V. Savchenko, E. Bozzo, and C. Ferrigno, on behalf of the INTEGRAL SPI-ACS GRB team, and
W. Boynton, C. Fellows, K. Harshman, H. Enos, R. Starr, and A.S. Gardner on on behalf of the GRS-Odyssey GRB team, report:
The long-duration GRB 220305B (Fermi GBM observation: Dunwoody et al., GCN Circ. 31689) has been detected by Fermi (GBM trigger 668172805), Konus-Wind, INTEGRAL (SPI-ACS), and Mars-Odyssey (HEND), so far, at about 41600 s UT (11:33:20).
We have triangulated it to a preliminary, 3 sigma error box whose coordinates are:
```
 ---------------------------------------------
  RA(2000), deg                 Dec(2000), deg
 ---------------------------------------------
 Center:
  176.112 (11h 44m 27s) -32.550 (-32d 33' 01")
 Corners:
  180.687 (12h 02m 45s) -27.127 (-27d 07' 36")
  171.638 (11h 26m 33s) -36.980 (-36d 58' 48")
  171.416 (11h 25m 40s) -37.080 (-37d 04' 47")
  180.469 (12h 01m 53s) -27.299 (-27d 17' 57")
 ---------------------------------------------
```
The error box area is 2893 sq. arcmin, and its maximum dimension is 12.7 deg (the minimum one is 4 arcmin). The Sun distance was 137 deg.
This box may be improved.
The IPN localization is consistent with, but reduces the area of, the Fermi GBM on-ground calculated location (GCN Circ. 31689).
A triangulation map and HEALPix FITS file are posted at http://www.ioffe.ru/LEA/GRBs/GRB220305_T41651/IPN/
The Konus-Wind time history and spectrum will be given in a forthcoming GCN Circular.

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Jochen Greiner, last update: 08-Mar-2022 [Disclaimer]