Gamma-ray Burst 220311A

(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 11 Mar 22 16:33:42 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      46
TRIGGER_NUM:     668709203
GRB_RA:          126.383d {+08h 25m 32s} (J2000),
                 126.765d {+08h 27m 04s} (current),
                 125.521d {+08h 22m 05s} (1950)
GRB_DEC:         +44.417d {+44d 25' 00"} (J2000),
                 +44.343d {+44d 20' 35"} (current),
                 +44.580d {+44d 34' 49"} (1950)
GRB_ERROR:       32.13 [deg radius, statistical plus systematic]
GRB_INTEN:       63 [cnts/sec]
DATA_SIGNIF:     4.50 [sigma]
INTEG_TIME:      4.096 [sec]
GRB_DATE:        19649 TJD;    70 DOY;   22/03/11
GRB_TIME:        59598.40 SOD {16:33:18.40} UT
GRB_PHI:         231.00 [deg]
GRB_THETA:       100.00 [deg]
DATA_TIME_SCALE: 4.0960 [sec]
HARD_RATIO:      0.39
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      93%  GRB
2nd_MOST_LIKELY:   2%  Generic Transient
DETECTORS:       0,0,0, 0,0,0, 0,1,1, 0,0,0, 0,0,
SUN_POSTN:       351.81d {+23h 27m 14s}   -3.53d {-03d 32' 01"}
SUN_DIST:        123.19 [deg]   Sun_angle= -9.0 [hr] (East of Sun)
MOON_POSTN:       94.97d {+06h 19m 53s}  +26.59d {+26d 35' 38"}
MOON_DIST:        31.08 [deg]
MOON_ILLUM:      62 [%]
GAL_COORDS:      175.97, 34.95 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      117.73, 24.42 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2022/bn220311690/quicklook/glg_lc_medres34_bn220311690.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 29.25,-12.03 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(3.0<100sec) coincident with the INTEGRAL event (trignum=9769).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Fri 11 Mar 22 16:42:35 UT
NOTICE_TYPE:     Fermi-GBM Final Position
RECORD_NUM:      0
TRIGGER_NUM:     668709203
GRB_RA:          131.120d {+08h 44m 29s} (J2000),
                 131.537d {+08h 46m 09s} (current),
                 130.176d {+08h 40m 42s} (1950)
GRB_DEC:         +55.040d {+55d 02' 24"} (J2000),
                 +54.958d {+54d 57' 30"} (current),
                 +55.221d {+55d 13' 17"} (1950)
GRB_ERROR:       18.65 [deg radius, statistical only]
GRB_DATE:        19649 TJD;    70 DOY;   22/03/11
GRB_TIME:        59598.40 SOD {16:33:18.40} UT
GRB_PHI:         229.00 [deg]
GRB_THETA:       111.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   41731 (Gnd S/W Version number)
SUN_POSTN:       351.81d {+23h 27m 15s}   -3.53d {-03d 31' 53"}
SUN_DIST:        119.19 [deg]   Sun_angle= -9.3 [hr] (East of Sun)
MOON_POSTN:       95.05d {+06h 20m 12s}  +26.60d {+26d 35' 46"}
MOON_DIST:        38.80 [deg]
MOON_ILLUM:      62 [%]
GAL_COORDS:      162.74, 37.96 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      117.56, 35.47 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2022/bn220311690/quicklook/glg_lc_medres34_bn220311690.gif
LOC_URL:         http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2022/bn220311690/quicklook/glg_locplot_all_bn220311690.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(3.0<100sec) coincident with the INTEGRAL event (trignum=9769).

GCN Circular #31740
The Fermi GBM team reports the detection of a likely LONG GRB
At 16:33:18 UT on 11 Mar 2022, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 220311A (trigger 668709203.400826 / 220311690).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 131.1, Dec = 55.0 (J2000 degrees, equivalent to J2000 08h 44m, 55d 00'), with a statistical uncertainty of 18.6 degrees.
The angle from the Fermi LAT boresight is 111.0 degrees.
The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2022/bn220311690/quicklook/glg_skymap_all_bn220311690.png
The HEALPix FITS file, including the estimated localization systematic, can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2022/bn220311690/quicklook/glg_healpix_all_bn220311690.fit
The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2022/bn220311690/quicklook/glg_lc_medres34_bn220311690.gif
GCN Circular #31744
S.Mereghetti (INAF, IASF-Milano), D.Gotz (CEA, Saclay), C.Ferrigno, E.Bozzo, V.Savchenko (ISDC, Versoix), L.Ducci (IAAT, Germany and ISDC, Versoix) and J.Borkowski (CAMK, Torun) report:
a gamma ray burst lasting about 20 s has been detected by IBAS in the IBIS/ISGRI data at 16:33:10 UT of March 11, 2022.
The refined coordinates (J2000) are:
```
R.A.=  157.9747 deg
DEC.=  +66.0819 deg
```
with an uncertainty of 3 arcmin (90% c.l.).
The burst had a peak flux of 0.3 ph/cm2/s (20-200 keV, 1-s integration time) and a fluence in the same energy range of about 2e-7 erg/cmq.
A plot of the light curve will be posted at http://ibas.iasf-milano.inaf.it/IBAS_Results.html
GCN Circular #31745
V. Lipunov (Lomonosov MSU)
The published OT candidate (GCN Circ 31741) is the noise inside the errorbox of one of the invalid triggers.
I'm sorry for the problems.
GCN Circular #31757
R. Hosokawa, Y. Imai, R. Yamaguchi, K. L. Murata, M. Niwano, N. Ito, Y. Takamatsu, R. Noto, S. Sato, M. Takaku, Y. Yatsu, and N. Kawai (Tokyo Tech) report on behalf of the MITSuME collaboration:
We observed the field of GRB 220311A (The Fermi GBM team GCN Circular #31740, V. Yurkov et al. GCN Circular #31741, V. Lipunov et al. GCN Circular #31742, V. Lipunov et al. GCN Circular #31743, S.Mereghetti et al. GCN Circular #31744, V. Lipunov et al. GCN Circular #31745) with the optical three color (g', Rc, and Ic) CCD cameras attached to the MITSuME 50 cm telescope Akeno. The observation with a series of 60 sec exposures started at 2022-03-11 16:44:51 UT (11.7 minutes after IBAS trigger). We stacked the images with good conditions. We did not detect any uncatalogued sources within the IBAS error region (S.Mereghetti et al. GCN Circular #31744). We obtained the 5-sigma limits of the stacked images as follows.
```
T0+[min] MID-UT T-EXP[sec] 5-sigma limits
------------------------------------------------------------------------------------------------
29.0 2022-03-11 17:02:10 1440 g'>19.8, Rc>19.8, Ic>19.0
------------------------------------------------------------------------------------------------
T0+ : Elapsed time after the burst
T-EXP: Total Exposure time
```
We used PS1 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. 2021, PASJ, Vol.73, Issue 1, Pages 4-24; https://github.com/MNiwano/Eclaire).
GCN Circular #31760
R. Hamburg (UAH) and C. Meegan (UAH) report on behalf of the Fermi GBM Team:
"At 16:33:18.40 UT on 11 March 2022, the Fermi Gamma-Ray Burst Monitor (GBM) triggered and located GRB 220311A (trigger 668709203 / 220311690), which was also detected by the INTEGRAL/IBAS (Mereghetti et al. 2022, GCN 31740). The Fermi GBM Final Real-time Localization (GCN 31744) is largely consistent with the INTEGRAL position.
The angle from the Fermi LAT boresight at the GBM trigger time is 111 degrees.
The GBM light curve shows a single spike with a duration (T90) of about 10 s (50-300 keV). The time-averaged spectrum from T0-5.1 s to T0+0.0 s is adequately a simple power law function with index -1.55 +/- 0.11.
The event fluence (10-1000 keV) in this time interval is (1.8 +/- 0.3)E-06 erg/cm^2. The 1-sec peak photon flux measured starting from T0-4.7 s in the 10-1000 keV band is 1.8 +/- 0.3 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/"

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Jochen Greiner, last update: 15-Mar-2022 [Disclaimer]