Gamma-ray Burst 240305A

(All information courtesy of the instrument teams.)

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Results of Observations

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Tue 05 Mar 24 09:49:50 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      47
TRIGGER_NUM:     731324966
GRB_RA:          359.367d {+23h 57m 28s} (J2000),
                 359.678d {+23h 58m 43s} (current),
                 358.720d {+23h 54m 53s} (1950)
GRB_DEC:         -52.033d {-52d 01' 59"} (J2000),
                 -51.899d {-51d 53' 54"} (current),
                 -52.312d {-52d 18' 41"} (1950)
GRB_ERROR:       19.47 [deg radius, statistical plus systematic]
GRB_INTEN:       81 [cnts/sec]
DATA_SIGNIF:     5.50 [sigma]
INTEG_TIME:      2.048 [sec]
GRB_DATE:        20374 TJD;    65 DOY;   24/03/05
GRB_TIME:        35361.26 SOD {09:49:21.26} UT
GRB_PHI:         301.00 [deg]
GRB_THETA:        50.00 [deg]
DATA_TIME_SCALE: 2.0480 [sec]
HARD_RATIO:      1.12
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      91%  GRB
2nd_MOST_LIKELY:   5%  Solar Flare
DETECTORS:       0,0,0, 1,1,1, 0,0,0, 0,0,0, 0,0,
SUN_POSTN:       346.48d {+23h 05m 56s}   -5.79d {-05d 47' 06"}
SUN_DIST:         47.39 [deg]   Sun_angle= -0.9 [hr] (East of Sun)
MOON_POSTN:      278.11d {+18h 32m 27s}  -28.41d {-28d 24' 42"}
MOON_DIST:        63.00 [deg]
MOON_ILLUM:      31 [%]
GAL_COORDS:      321.44,-63.11 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      332.53,-46.10 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240305409/quicklook/glg_lc_medres34_bn240305409.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 341.80,25.50 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Tue 05 Mar 24 09:50:08 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      58
TRIGGER_NUM:     731324966
GRB_RA:           20.050d {+01h 20m 12s} (J2000),
                  20.320d {+01h 21m 17s} (current),
                  19.490d {+01h 17m 58s} (1950)
GRB_DEC:         -40.360d {-40d 21' 35"} (J2000),
                 -40.234d {-40d 14' 00"} (current),
                 -40.622d {-40d 37' 18"} (1950)
GRB_ERROR:       8.34 [deg radius, statistical only]
DATA_SIGNIF:     7.80 [sigma]
DATA_INTERVAL:   4.096 [sec]
GRB_DATE:        20374 TJD;    65 DOY;   24/03/05
GRB_TIME:        35361.26 SOD {09:49:21.26} UT
GRB_PHI:         309.00 [deg]
GRB_THETA:        67.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   4173 (Gnd S/W Version number)
SUN_POSTN:       346.48d {+23h 05m 56s}   -5.79d {-05d 47' 06"}
SUN_DIST:         45.89 [deg]   Sun_angle= -2.3 [hr] (East of Sun)
MOON_POSTN:      278.11d {+18h 32m 27s}  -28.41d {-28d 24' 41"}
MOON_DIST:        80.48 [deg]
MOON_ILLUM:      31 [%]
GAL_COORDS:      280.55,-75.49 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      358.57,-44.27 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240305409/quicklook/glg_lc_medres34_bn240305409.gif
POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_731324966.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 05 Mar 24 09:58:38 UT
NOTICE_TYPE:     Fermi-GBM Final Position
RECORD_NUM:      0
TRIGGER_NUM:     731324966
GRB_RA:           21.090d {+01h 24m 22s} (J2000),
                  21.356d {+01h 25m 25s} (current),
                  20.539d {+01h 22m 09s} (1950)
GRB_DEC:         -42.060d {-42d 03' 35"} (J2000),
                 -41.935d {-41d 56' 03"} (current),
                 -42.320d {-42d 19' 12"} (1950)
GRB_ERROR:       9.80 [deg radius, statistical only]
GRB_DATE:        20374 TJD;    65 DOY;   24/03/05
GRB_TIME:        35361.26 SOD {09:49:21.26} UT
GRB_PHI:         307.00 [deg]
GRB_THETA:        67.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   41731 (Gnd S/W Version number)
SUN_POSTN:       346.49d {+23h 05m 57s}   -5.78d {-05d 46' 58"}
SUN_DIST:         47.58 [deg]   Sun_angle= -2.3 [hr] (East of Sun)
MOON_POSTN:      278.21d {+18h 32m 50s}  -28.41d {-28d 24' 28"}
MOON_DIST:        80.27 [deg]
MOON_ILLUM:      31 [%]
GAL_COORDS:      280.79,-73.62 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      358.23,-46.13 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240305409/quicklook/glg_lc_medres34_bn240305409.gif
LOC_URL:         http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240305409/quicklook/glg_locplot_all_bn240305409.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.

GCN Circular #35869
The Fermi GBM team reports the detection of a likely LONG GRB
At 09:49:21 UT on 5 Mar 2024, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 240305A (trigger 731324966.26389 / 240305409).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 21.1, Dec = -42.1 (J2000 degrees, equivalent to J2000 01h 24m, -42d 06'), with a statistical uncertainty of 9.8 degrees.
The angle from the Fermi LAT boresight is 67.0 degrees.
The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240305409/quicklook/glg_skymap_all_bn240305409.png
The HEALPix FITS file, including the estimated localization systematic, can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240305409/quicklook/glg_healpix_all_bn240305409.fit
The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240305409/quicklook/glg_lc_medres34_bn240305409.gif
GCN Circular #35880
James DeLaunay (PSU), Aaron Tohuvavohu (U Toronto), Samuele Ronchini (PSU), Gayathri Raman (PSU), Jamie A. Kennea (PSU), Tyler Parsotan (NASA GSFC) report:
Swift/BAT did not localize GRB 240305A onboard (T0: 2024-03-05T09:49:21.26 UTC, Fermi/GBM trigger 731324994).
The Fermi notice, distributed in near real-time, triggered the Swift Mission Operations Center operated Gamma-ray Urgent Archiver for Novel Opportunities (GUANO; Tohuvavohu et al. 2020, ApJ, 900, 1).
Upon trigger by this notice, GUANO sent a command to the Swift Burst Alert Telescope (BAT) to save 200 seconds of BAT event-mode data from [-50,+150] seconds around the time of the burst. All the requested event mode data was delivered to the ground.
In ground analysis of the available TTE data, we find the position of the burst with SNR 9.7 in the image domain using a slew mosaic technique.
The BAT position is RA, Dec = 6.278, -43.904, which is:
```
    RA (J2000)     00h 25m 06.72s
    Dec (J2000)  -43d 54' 14.4"
```
with an estimated uncertainty of 5 arcminutes
XRT and UVOT will not follow-up due to sun constraints. Results of follow-up observations will be reported in future circulars.
GUANO is a fully autonomous, extremely low latency, spacecraft commanding pipeline designed for targeted recovery of BAT event mode data around the times of compelling astrophysical events to enable more sensitive GRB searches.
A live reporting of Swift/BAT event data recovered by GUANO can be found at: https://www.swift.psu.edu/guano/
GCN Circular #35888
E. Bissaldi (Politecnico and INFN Bari) and C. Meegan (UAH) report on behalf of the Fermi GBM Team:
"At 09:49:21.26 UT on 05 March 2024, the Fermi Gamma-Ray Burst Monitor (GBM) triggered and located GRB 240305A (trigger 731324966 / 240305409), which was also detected by the Swift/BAT GUANO (DeLaunay et al. 2024, GCN 35880). The Fermi GBM Final Real-time Localization (GCN 35869) is consistent with the Swift position.
The angle from the Fermi LAT boresight at the GBM trigger time is 56 degrees.
The GBM light curve consists of a single weak emission episode with a duration (T90) of about 13 s (50-300 keV). The time-averaged spectrum from T0-2.3 s to T0+10.2 s is best fit by a simple power law function with index -2.06 +/- 0.07.
The event fluence (10-1000 keV) in this time interval is (1.29 +/- 0.12)e-06 erg/cm^2. The 1-sec peak photon flux measured starting from T0+2.0 s in the 10-1000 keV band is 2.05 +/- 0.19 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 #35890
V. Lipunov, V.Kornilov, E. Gorbovskoy, K. Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, V.Senik, D. Vlasenko, G.Antipov, D.Zimnukhov, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D. Cheryasov, Ya.Kechin, Yu.Tselik, A. Sosnovskij (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. Gress, N.M. Budnev, O.Ershova (Irkutsk State University, API),
L.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez, A.R.Corella, L.H.Rodriguez (INAOE, Guillermo Haro Astrophysics Observatory),
A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory),
V. Yurkov, A. Gabovich (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 GRB 240305A ( Fermi GBM team, GCN 35869) errorbox 1 days 30310 sec after notice time and 1 days 30342 sec after trigger time at 2024-03-06 18:15:03 UT, with upper limit up to 19.4 mag. Observations started at twilight. The observations began at zenith distance = 55 deg. The sun altitude is -14.9 deg.
The galactic latitude b = -74 deg., longitude l = 279 deg.
Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2391924
We obtain a following upper limits.

Tmid-T0  |      Date Time      |          Site       |             Coord (J2000)          |Filt.| Expt. | Limit| Comment
_________|_____________________|_____________________|____________________________________|_____|_______|_______|________

  116772 | 2024-03-06 18:15:03 |         MASTER-SAAO | (01h 52m 23.63s , -44d 32m 26.3s) |   C |    60 | 13.7 |        
  117330 | 2024-03-06 18:24:20 |         MASTER-SAAO | (01h 23m 00.92s , -38d 48m 51.7s) |   C |    60 | 12.3 |        
  118229 | 2024-03-06 18:39:19 |         MASTER-SAAO | (01h 36m 10.23s , -42d 27m 04.8s) |   C |    60 | 13.2 |        
  118229 | 2024-03-06 18:39:19 |         MASTER-SAAO | (01h 42m 50.95s , -42d 39m 23.8s) |   C |    60 | 15.1 |        
  118309 | 2024-03-06 18:40:39 |         MASTER-SAAO | (01h 30m 42.38s , -38d 40m 29.4s) |   C |    60 | 14.5 |        
  118309 | 2024-03-06 18:40:39 |         MASTER-SAAO | (01h 37m 00.55s , -38d 52m 46.6s) |   C |    60 | 13.7 |        
  118388 | 2024-03-06 18:41:59 |         MASTER-SAAO | (01h 20m 49.84s , -46d 15m 01.5s) |   C |    60 | 16.2 |        
  118388 | 2024-03-06 18:41:59 |         MASTER-SAAO | (01h 27m 56.71s , -46d 27m 27.1s) |   C |    60 | 15.7 |        
  118468 | 2024-03-06 18:43:19 |         MASTER-SAAO | (00h 54m 49.20s , -42d 27m 18.8s) |   C |    60 | 17.2 |        
  118468 | 2024-03-06 18:43:19 |         MASTER-SAAO | (01h 01m 28.21s , -42d 39m 44.6s) |   C |    60 | 15.0 |        
  118548 | 2024-03-06 18:44:38 |         MASTER-SAAO | (01h 39m 17.93s , -44d 20m 50.7s) |   C |    60 | 15.4 |        
  118548 | 2024-03-06 18:44:38 |         MASTER-SAAO | (01h 46m 10.88s , -44d 33m 13.0s) |   C |    60 | 15.3 |        
  118627 | 2024-03-06 18:45:58 |         MASTER-SAAO | (00h 56m 45.33s , -44d 21m 16.1s) |   C |    60 | 18.3 |        
  118627 | 2024-03-06 18:45:58 |         MASTER-SAAO | (01h 03m 37.12s , -44d 33m 43.9s) |   C |    60 | 18.3 |        
  118707 | 2024-03-06 18:47:18 |         MASTER-SAAO | (00h 53m 11.03s , -40d 34m 12.1s) |   C |    60 | 19.2 |        
  118707 | 2024-03-06 18:47:18 |         MASTER-SAAO | (00h 59m 38.30s , -40d 46m 36.9s) |   C |    60 | 19.4 |        
  118787 | 2024-03-06 18:48:38 |         MASTER-SAAO | (01h 15m 34.39s , -42d 28m 26.0s) |   C |    60 | 19.4 |        
  118787 | 2024-03-06 18:48:38 |         MASTER-SAAO | (01h 22m 13.76s , -42d 40m 50.0s) |   C |    60 | 19.3 |        
  118866 | 2024-03-06 18:49:57 |         MASTER-SAAO | (01h 13m 16.50s , -40d 32m 48.9s) |   C |    60 | 19.3 |        
  118866 | 2024-03-06 18:49:57 |         MASTER-SAAO | (01h 19m 43.99s , -40d 45m 11.2s) |   C |    60 | 19.3 |        
  118946 | 2024-03-06 18:51:17 |         MASTER-SAAO | (01h 18m 00.60s , -44d 22m 20.9s) |   C |    60 | 19.4 |        
  118946 | 2024-03-06 18:51:17 |         MASTER-SAAO | (01h 24m 52.76s , -44d 34m 46.7s) |   C |    60 | 19.4 |        
  119026 | 2024-03-06 18:52:37 |         MASTER-SAAO | (01h 33m 22.27s , -40d 32m 35.9s) |   C |    60 | 19.3 |

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Jochen Greiner, last update: 06-Mar-2024 [Disclaimer]