Gamma-ray Burst 240929A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

none

Results of Observations

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Sun 29 Sep 24 19:50:33 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      48
TRIGGER_NUM:     749332209
GRB_RA:          311.317d {+20h 45m 16s} (J2000),
                 310.905d {+20h 43m 37s} (current),
                 312.111d {+20h 48m 27s} (1950)
GRB_DEC:         +81.850d {+81d 50' 60"} (J2000),
                 +81.941d {+81d 56' 26"} (current),
                 +81.665d {+81d 39' 53"} (1950)
GRB_ERROR:       10.32 [deg radius, statistical plus systematic]
GRB_INTEN:       376 [cnts/sec]
DATA_SIGNIF:     16.30 [sigma]
INTEG_TIME:      1.024 [sec]
GRB_DATE:        20582 TJD;   273 DOY;   24/09/29
GRB_TIME:        71404.09 SOD {19:50:04.09} UT
GRB_PHI:         227.00 [deg]
GRB_THETA:       115.00 [deg]
DATA_TIME_SCALE: 1.0240 [sec]
HARD_RATIO:      0.90
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      97%  GRB
2nd_MOST_LIKELY:   1%  Generic Transient
DETECTORS:       0,0,0, 0,0,0, 0,0,1, 0,0,1, 0,0,
SUN_POSTN:       186.57d {+12h 26m 17s}   -2.84d {-02d 50' 23"}
SUN_DIST:         97.36 [deg]   Sun_angle= -8.3 [hr] (East of Sun)
MOON_POSTN:      157.98d {+10h 31m 56s}  +12.25d {+12d 14' 49"}
MOON_DIST:        84.95 [deg]
MOON_ILLUM:      8 [%]
GAL_COORDS:      115.15, 23.03 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       72.46, 71.91 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240929826/quicklook/glg_lc_medres34_bn240929826.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 50.72,14.25 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Sun 29 Sep 24 19:50:43 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      59
TRIGGER_NUM:     749332209
GRB_RA:          324.183d {+21h 36m 44s} (J2000),
                 324.142d {+21h 36m 34s} (current),
                 324.256d {+21h 37m 01s} (1950)
GRB_DEC:         +77.250d {+77d 15' 00"} (J2000),
                 +77.362d {+77d 21' 42"} (current),
                 +77.024d {+77d 01' 27"} (1950)
GRB_ERROR:       5.38 [deg radius, statistical plus systematic]
GRB_INTEN:       647 [cnts/sec]
DATA_SIGNIF:     55.60 [sigma]
INTEG_TIME:      4.096 [sec]
GRB_DATE:        20582 TJD;   273 DOY;   24/09/29
GRB_TIME:        71404.09 SOD {19:50:04.09} UT
GRB_PHI:         226.00 [deg]
GRB_THETA:       110.00 [deg]
DATA_TIME_SCALE: 4.0960 [sec]
HARD_RATIO:      0.82
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      97%  GRB
2nd_MOST_LIKELY:   1%  Generic Transient
DETECTORS:       0,0,0, 0,0,0, 0,0,1, 0,0,1, 0,0,
SUN_POSTN:       186.57d {+12h 26m 17s}   -2.84d {-02d 50' 23"}
SUN_DIST:        102.10 [deg]   Sun_angle= -9.2 [hr] (East of Sun)
MOON_POSTN:      157.98d {+10h 31m 56s}  +12.25d {+12d 14' 47"}
MOON_DIST:        90.04 [deg]
MOON_ILLUM:      8 [%]
GAL_COORDS:      112.87, 18.36 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       56.41, 71.13 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240929826/quicklook/glg_lc_medres34_bn240929826.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 50.72,14.25 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(1.0<100sec) coincident with the INTEGRAL event (trignum=10928).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Sun 29 Sep 24 19:50:52 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      58
TRIGGER_NUM:     749332209
GRB_RA:            0.700d {+00h 02m 48s} (J2000),
                   1.024d {+00h 04m 06s} (current),
                   0.054d {+00h 00m 13s} (1950)
GRB_DEC:         +72.520d {+72d 31' 12"} (J2000),
                 +72.658d {+72d 39' 28"} (current),
                 +72.242d {+72d 14' 30"} (1950)
GRB_ERROR:       2.47 [deg radius, statistical only]
DATA_SIGNIF:     43.10 [sigma]
DATA_INTERVAL:   4.096 [sec]
GRB_DATE:        20582 TJD;   273 DOY;   24/09/29
GRB_TIME:        71404.09 SOD {19:50:04.09} UT
GRB_PHI:         216.00 [deg]
GRB_THETA:       106.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   4173 (Gnd S/W Version number)
SUN_POSTN:       186.57d {+12h 26m 17s}   -2.84d {-02d 50' 24"}
SUN_DIST:        110.10 [deg]   Sun_angle= -11.6 [hr] (East of Sun)
MOON_POSTN:      157.98d {+10h 31m 56s}  +12.25d {+12d 14' 45"}
MOON_DIST:        93.76 [deg]
MOON_ILLUM:      8 [%]
GAL_COORDS:      119.25, 10.00 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       51.88, 60.89 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240929826/quicklook/glg_lc_medres34_bn240929826.gif
POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_749332209.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.  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(1.0<100sec) coincident with the INTEGRAL event (trignum=10928).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Sun 29 Sep 24 19:51:46 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      2
TRIGGER_NUM:     749332209
GRB_RA:          356.490d {+23h 45m 58s} (J2000),
                 356.777d {+23h 47m 06s} (current),
                 355.918d {+23h 43m 40s} (1950)
GRB_DEC:         +75.010d {+75d 00' 36"} (J2000),
                 +75.148d {+75d 08' 51"} (current),
                 +74.732d {+74d 43' 56"} (1950)
GRB_ERROR:       2.07 [deg radius, statistical only]
DATA_SIGNIF:     67.00 [sigma]
DATA_INTERVAL:   6.144 [sec]
GRB_DATE:        20582 TJD;   273 DOY;   24/09/29
GRB_TIME:        71404.09 SOD {19:50:04.09} UT
GRB_PHI:         218.00 [deg]
GRB_THETA:       108.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   41731 (Gnd S/W Version number)
SUN_POSTN:       186.57d {+12h 26m 18s}   -2.84d {-02d 50' 24"}
SUN_DIST:        107.47 [deg]   Sun_angle= -11.3 [hr] (East of Sun)
MOON_POSTN:      157.99d {+10h 31m 58s}  +12.24d {+12d 14' 33"}
MOON_DIST:        91.84 [deg]
MOON_ILLUM:      8 [%]
GAL_COORDS:      118.65, 12.69 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       55.07, 63.20 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240929826/quicklook/glg_lc_medres34_bn240929826.gif
POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_749332209.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(1.0<100sec) coincident with the INTEGRAL event (trignum=10928).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Sun 29 Sep 24 19:52:06 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      4
TRIGGER_NUM:     749332209
GRB_RA:            0.360d {+00h 01m 26s} (J2000),
                   0.681d {+00h 02m 43s} (current),
                 359.719d {+23h 58m 53s} (1950)
GRB_DEC:         +72.530d {+72d 31' 48"} (J2000),
                 +72.668d {+72d 40' 04"} (current),
                 +72.252d {+72d 15' 06"} (1950)
GRB_ERROR:       1.17 [deg radius, statistical only]
DATA_SIGNIF:     75.40 [sigma]
DATA_INTERVAL:   11.264 [sec]
GRB_DATE:        20582 TJD;   273 DOY;   24/09/29
GRB_TIME:        71404.09 SOD {19:50:04.09} UT
GRB_PHI:         216.00 [deg]
GRB_THETA:       106.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   41731 (Gnd S/W Version number)
SUN_POSTN:       186.57d {+12h 26m 18s}   -2.84d {-02d 50' 25"}
SUN_DIST:        110.08 [deg]   Sun_angle= -11.6 [hr] (East of Sun)
MOON_POSTN:      157.99d {+10h 31m 58s}  +12.24d {+12d 14' 28"}
MOON_DIST:        93.80 [deg]
MOON_ILLUM:      8 [%]
GAL_COORDS:      119.15, 10.03 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       51.78, 60.98 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240929826/quicklook/glg_lc_medres34_bn240929826.gif
POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_749332209.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(1.0<100sec) coincident with the INTEGRAL event (trignum=10928).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Sun 29 Sep 24 19:59:22 UT
NOTICE_TYPE:     Fermi-GBM Final Position
RECORD_NUM:      0
TRIGGER_NUM:     749332209
GRB_RA:          356.150d {+23h 44m 36s} (J2000),
                 356.434d {+23h 45m 44s} (current),
                 355.584d {+23h 42m 20s} (1950)
GRB_DEC:         +75.010d {+75d 00' 36"} (J2000),
                 +75.147d {+75d 08' 51"} (current),
                 +74.732d {+74d 43' 56"} (1950)
GRB_ERROR:       1.38 [deg radius, statistical only]
GRB_DATE:        20582 TJD;   273 DOY;   24/09/29
GRB_TIME:        71404.09 SOD {19:50:04.09} UT
GRB_PHI:         218.00 [deg]
GRB_THETA:       108.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   41731 (Gnd S/W Version number)
SUN_POSTN:       186.58d {+12h 26m 19s}   -2.84d {-02d 50' 32"}
SUN_DIST:        107.45 [deg]   Sun_angle= -11.3 [hr] (East of Sun)
MOON_POSTN:      158.05d {+10h 32m 12s}  +12.21d {+12d 12' 52"}
MOON_DIST:        91.90 [deg]
MOON_ILLUM:      8 [%]
GAL_COORDS:      118.56, 12.71 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       54.98, 63.27 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240929826/quicklook/glg_lc_medres34_bn240929826.gif
LOC_URL:         http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240929826/quicklook/glg_locplot_all_bn240929826.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(1.0<100sec) coincident with the INTEGRAL event (trignum=10928).

GCN Circular #37626
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-Tavrida robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Lomonosov MSU, SAI Crimea astronomical station) was pointed to the Integral GRB240929.83 (trigger No 10928,00h 09m 36.49s , +74d 49m 16.9s, R=0.048) errorbox 18 sec after notice time and 53 sec after trigger time at 2024-09-29 19:50:59 UT, with upper limit up to 15.9 mag. The observations began at zenith distance = 32 deg. The sun altitude is -43.0 deg.
The galactic latitude b = 12 deg., longitude l = 120 deg.
Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2619163
We obtain a following upper limits.
```
Tmid-T0  |          Site       |Filt.| Expt. | Limit| Comment
_________|_____________________|_____|_______|______|________

      59 |      MASTER-Tavrida |  P/ |    10 | 15.9 |        
```
The observation and reduction will continue. The message may be cited.
GCN Circular #37627
The Fermi GBM team reports the detection of a likely LONG GRB
At 19:50:04 UT on 29 Sep 2024, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 240929A (trigger 749332209.094252 / 240929826).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 356.1, Dec = 75.0 (J2000 degrees, equivalent to J2000 23h 44m, 75d 00'), with a statistical uncertainty of 1.4 degrees.
The angle from the Fermi LAT boresight is 108.0 degrees.
The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240929826/quicklook/glg_skymap_all_bn240929826.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/bn240929826/quicklook/glg_healpix_all_bn240929826.fit
The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240929826/quicklook/glg_lc_medres34_bn240929826.gif
GCN Circular #37628
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-Tavrida robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Lomonosov MSU, SAI Crimea astronomical station) started inspect of the Fermi GRB 240929A ( Fermi GBM team, GCN 37627) errorbox 21 sec after notice time and 55 sec after trigger time at 2024-09-29 19:50:59 UT, with upper limit up to 17.9 mag. The observations began at zenith distance = 32 deg. The sun altitude is -43.0 deg.
The galactic latitude b = 13 deg., longitude l = 119 deg.
Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2619216
We obtain a following upper limits.
```
Tmid-T0  |      Date Time      |          Site       |             Coord (J2000)          |Filt.| Expt. | Limit| Comment
_________|_____________________|_____________________|____________________________________|_____|_______|_______|________

      60 | 2024-09-29 19:50:59 |      MASTER-Tavrida | (00h 07m 38.65s , +74d 41m 45.4s) |  P/ |    10 | 15.9 |        
     378 | 2024-09-29 19:55:47 |      MASTER-Tavrida | (00h 07m 39.07s , +74d 41m 46.6s) |  P/ |    70 | 17.1 |        
     520 | 2024-09-29 19:57:59 |      MASTER-Tavrida | (00h 07m 38.99s , +74d 41m 46.3s) |  P/ |    90 | 17.3 |        
     692 | 2024-09-29 20:00:30 |      MASTER-Tavrida | (00h 07m 38.85s , +74d 41m 45.2s) |  P/ |   130 | 17.7 |        
     898 | 2024-09-29 20:03:42 |      MASTER-Tavrida | (00h 07m 38.77s , +74d 41m 43.8s) |  P/ |   160 | 17.6 |        
    1130 | 2024-09-29 20:07:24 |      MASTER-Tavrida | (00h 07m 38.90s , +74d 41m 43.2s) |  P/ |   180 | 17.6 |        
    1373 | 2024-09-29 20:11:27 |      MASTER-Tavrida | (00h 07m 39.18s , +74d 41m 43.7s) |  P/ |   180 | 17.8 |        
    1616 | 2024-09-29 20:15:29 |      MASTER-Tavrida | (00h 07m 39.36s , +74d 41m 45.4s) |  P/ |   180 | 17.7 |        
    1859 | 2024-09-29 20:19:33 |      MASTER-Tavrida | (00h 07m 39.49s , +74d 41m 48.9s) |  P/ |   180 | 17.9 |        
```
The observation and reduction will continue. The message may be cited.
GCN Circular #37629
T. Preis, B. Biltzinger, J. Burgess & J. Greiner (all MPE Garching) report:
The public trigdat data of the Fermi Gamma-ray Burst Monitor (GBM) trigger 749332209 at 19:50:04 on 29 Sept. 2024 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 is:
```
RA(2000.0) = 359.0 deg
Decl.(2000.0) = 75.4 deg
```
The 1 sigma statistical error radius is 2.5 deg. We estimate an additional systematic error of 1 deg.
Further details are available at: https://grb.mpe.mpg.de/grb/GRB240929826/
The Healpix map can be downloaded from: https://grb.mpe.mpg.de/grb/GRB240929826/healpix
The location parameters are available as JSON at: https://grb.mpe.mpg.de/grb/GRB240929826/json
GCN Circular #37630
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 19:50:02 UT of 2024 September 29.
The refined coordinates (J2000) are:
```
R.A.=  2.4233 deg
DEC.=  74.8275 deg
```
with an uncertainty of 2 arcmin (90% c.l.).
A preliminary analysis gives a peak flux of about 5 ph/cm2/s (20-200 keV, 1-s integration time) and a fluence in the same energy range of about 3e-6 erg/cmq. Due to telemetry saturation, these values should be considered as lower limits.
This burst has also been detected by Fermi/GBM (GCN 37627).
A plot of the light curve will be posted at http://ibas.iasf-milano.inaf.it/IBAS_Results.html
GCN Circular #37642
L. Moretti and E. Pavoni (Leavitt Observatory, Italy),
Members of: GRB/UAI - Gamma ray Burst section of Unione Astrofili Italiani. ATA - Associazione Tuscolana di Astronomia.
In a large collaboration with: M.G. Dainotti (National Astronomical Observatory of Japan), Y. Niino (Tokyo University, Institute of Astronomy), K. Kalinowski (Aarhus University, Department of Physics and Astronomy), B. De Simone (Universita' degli Studi Di Salerno) report:
We imaged the field of GRB 240929A detected by INTEGRAL (Fermi GBM Team, GC= N 37627; Lipunov et al., GCN 37628; Preis et al., GCN 37629; Mereghetti et = al., GCN 37630), with the RC telescope (D=3D250 mm, F/D=3D8) of Leavitt Obs= ervatory, Italy.=20
The observations started at 20:17:40 UT on 2024-09-29, i.e. about 27 min. after the INTEGRAL trigger, at the following position:
```
RA(J2000)  = 00h 09m 42s =09
Dec(J2000) = 74=C2=B0 49' 39"
```
Weather conditions were good.
We co-added 27 exposures of 120 sec each (total 54 min).
We did not found any optical counterpart in the error box (2 arcmin) of INTEGRAL, with the following upper limit:
```
Start                   End                     Limit
2024-09-29T20:17:40     2024-09-29T21:10:53     > 20.9
```
Magnitudes were estimated with the BP-band of Gaia DR3 catalogue (*) and ar= e not corrected for galactic dust extinction.
Reference: https://leavittobservatory.altervista.org
The message may be cited.
(*) https://gea.esac.esa.int/archive/documentation/GEDR3/Data_processing/chap_cu5pho/cu5pho_sec_photSystem/cu5pho_ssec_photRelations.html
GCN Circular #37650
SVOM/GRM team: Chao Zheng, Chen-Wei Wang, Shi-Jie Zheng, Yong-Wei Dong, Jia= ng-Tao Liu, Jian-Chao Sun, Yue Huang, Jiang He, Min Gao, Hao-Xuan Guo, Lu L= i, Yong-Ye Li, Hong-Wei Liu, Xin Liu, Hao-Li Shi, Li-Ming Song, You-Li Tuo,= Wen-Jun Tan, Wen-Long Zhang, Hao-Xi Wang, Jin Wang, Jin-Zhou Wang, Ping W= ang, Rui-Jie Wang, Yu-Xi Wang, Bo-Bing Wu, Shao-Lin Xiong, Jian-Ying Ye, Yi= -Tao Yin, Wen-Hui Yu, Fan Zhang, Li Zhang, Peng Zhang, Shuang-Nan Zhang, Y= an-Ting Zhang, Yan-Qiu Zhang, Shu-Min Zhao, Xiao-Yun Zhao (IHEP), Maria-Gra= zia Bernardini (LUPM/INAF-OAB), Laurent Bouchet (IRAP), David Corre (CEA), = Tais Maiolino (LUPM), Fr=C3=A9d=C3=A9ric Piron (LUPM), St=C3=A9phane Schann= e (CEA), Jingwei Wang (IAP)
SVOM JSWG: Jian-Yan Wei (NAOC), Bertrand Cordier (CEA), Shuang-Nan Zhang (I= HEP), St=C3=A9phane Basa (LAM), Shao-Lin Xiong (IHEP), Jean-Luc Att=C3=A9ia= (IRAP), Arnaud Claret (CEA), Zi-Gao Dai (USTC), Fr=C3=A9d=C3=A9ric Daigne = (IAP), Jin-Song Deng (NAOC), Andrea Goldwurm (APC), Diego G=C3=B6tz (CEA), = Xu-Hui Han (NAOC), Cyril Lachaud (APC), En-Wei Liang (GXU), Yu-Lei Qiu (NAO= C), Susanna Vergani (Obs.Paris), Jing Wang (NAOC), Chao Wu (NAOC), Li-Ping = Xin (NAOC), Bing Zhang (UNLV)
report on behalf of the SVOM team:
During the commissioning phase, the SVOM/GRM was triggered in-flight by a l= ong GRB 240929A (SVOM trigger reference: sb 24092904) at 2024-09-29T19:50:0= 8.000 UT (T0), which also triggered Fermi/GBM (Fermi GBM team, GCN 37627) a= nd INTEGRAL IBAS (S.Mereghetti et al., GCN 37630).
With the event-by-event data downloaded through the X-band ground station, the GRM light curve shows that this burst consists of multiple pulses with a duration of about 17 s.
The GRM light curve can be found here: https://www.bursthub.cn//admin/static/svgrb240929A.png
ECLAIRs was not collecting data at the time of the burst.
The Space Variable Objects Monitor (SVOM) is a China-France joint mission l= ed by the Chinese National Space Administration (CNSA, China), National Cen= ter for Space Studies (CNES, France) and the Chinese Academy of Sciences (C= AS, China), which is dedicated to observing gamma-ray bursts and other tran= sient phenomena in the energetic universe. GRM is developed by the Institut= e of High Energy Physics (IHEP) of CAS.
The SVOM point of contact for this burst is: Chao Zheng (IHEP)(zhengchao97@= ihep.ac.cn)
GCN Circular #37657
M. Dafcikova, J. Ripa, M. Kolar (Masaryk U.), A. Pal (Konkoly Observatory), N. Werner (Masaryk U.), M. Ohno, H. Takahashi (Hiroshima U.), L. Meszaros, B. Csak (Konkoly Observatory), N. Husarikova, F. Munz , M. Topinka, M. Dur= iskova, L. Szakszonova, J.-P. Breuer, F. Hroch (Masaryk U.), T. Urbanec, M. Kasal, A. Povalac (Brno U. of Technology), J. Hudec, J. Kapus, M. Frajt (= Spacemanic s.r.o), R. Laszlo, M. Koleda (Needronix s.r.o), M. Smelko, P. Ha= nak, P. Lipovsky (Technical U. of Kosice), G. Galgoczi (Wigner Research Cen= ter/Eotvos U.), Y. Uchida, H. Poon, H. Matake (Hiroshima U.), N. Uchida (IS= AS/JAXA), T. Bozoki (Eotvos U.), G. Dalya (Eotvos U.), T. Enoto (Kyoto U.), Zs. Frei (Eotvos U.), G. Friss (Eotvos U.), Y. Fukazawa, K. Hirose (Hirosh= ima U.), S. Hisadomi (Nagoya U.), Y. Ichinohe (Rikkyo U.), K. Kapas (Eotvos= U.), L. L. Kiss (Konkoly Observatory), T. Mizuno (Hiroshima U.), K. Nakaz= awa (Nagoya U.), H. Odaka (Univ of Tokyo), J. Takatsy (Eotvos U.), K. Torig= oe (Hiroshima U.), N. Kogiso, M. Yoneyama (Osaka Metropolitan U.), M. Morit= aki (U. Tokyo), T. Kano (U. Michigan) -- the GRBAlpha collaboration.
The long-duration GRB 240929A (Fermi/GBM detection: GCN 37627; INTEGRAL/IBA= S detection: GCN 37630; SVOM/GRM detection: GCN 37650; INTEGRAL/SPI-ACS pea= k detection at 2024-09-29 ~19:50:05 UTC) was observed by the GRBAlpha 1U Cu= beSat (Pal et al. 2023, A&A, 677, 40; https://ui.adsabs.harvard.edu/abs/202= 3A%26A...677A..40P/abstract).
The detection was confirmed at the peak time 2024-09-29 19:50:08.6 UTC. The= T90 duration measured by GRBAlpha is 12.5 s and the overall significance d= uring T90 reaches 22 sigma.
The light curve obtained by GRBAlpha is available here: https://grbalpha.ko= nkoly.hu/static/share/GRB240929A_GCN.pdf
All GRBAlpha detections are listed at: https://monoceros.physics.muni.cz/he= a/GRBAlpha/ GRBAlpha, launched on 2021 March 22, is a demonstration mission for a futur= e CubeSat constellation (Werner et al. Proc. SPIE 2018). The detector of GR= BAlpha consists of a 75 x 75 x 5 mm3 CsI scintillator read out by a SiPM ar= ray, covering the energy range from ~50 keV to ~1000 keV. To increase the d= uty cycle and the downlink rate, the upgrade of the on-board data acquisiti= on software stack is in progress. The ground segment is also supported by t= he radio amateur community and it takes advantage of the SatNOGS network fo= r increased data downlink volume.
GCN Circular #37672
C. Guidorzi (U. Ferrara), R. Smith (LJMU), A. Gomboc (U. Nova Gorica), C.J. Mottram, I.A. Steele (LJMU) report:
The 2-m robotic Liverpool Telescope automatically started observing with the MOPTOP polarimeter GRB 240929A detected by Fermi, INTEGRAL, SVOM, GRBAlpha (Fermi GBM team, GCN 37627; Mereghetti et al. GCN 37630; SVOM team, GCN 37650; Dafcikova et al., GCN 37657) at 19:54:06 UT, that is 242 s after the Fermi/GBM trigger time. In a 64x4s stacked frame in the MOP-R filter from 242 to 405 s since the Fermi/GBM trigger time, we do not find any uncatalogued object down to R>19.5 mag within the INTEGRAL error circle (Mereghetti et al.), as calibrated against Pan-STARRS catalog field stars.
GCN Circular #37689
N. Pankov (HSE, IKI), A. Moskvitin (SAO), E. Klunko (ISTP), V. Rumyantsev (= CrAO), A. Pozanenko (IKI), I. Spiridonova (SAO), S. Belkin (HSE, IKI) repor= t on behalf of IKI GRB FuN:
We observed the field of long GRB 240929A detected by INTEGRAL (Mereghetti et al., GCN 37630) and aslso detected by Fermi GBM (Fermi GBM team, GCN 376= 27; Preis et al., GCN 37629), SVOM (Zheng et al., GCN 37650), and GRBAlpha= (Dafcikova et al., GCN 37657) with Zeiss-1000 1.0-meter telescope (equippe= d with EEV CCD42-40 and the Rc-filter) of SAO RAS observatory, AZT-33IK 1.5= -meter telescope (equipped with ANDOR NEO CMOS camera and the R-filter) of Mondy observatory, and ZTSh 2.6-meter telescope (equipped with FLI ProLine PL4240 CCD and the R-filter) of CrAO. The observations began at SAO RAS on 2024-09-30 19:42:11 UT. Details of the observations are as follows:
```
Date       UTstart  t-T0         Exp.    Filter   UL       Telesope
                    (mid, days)  (n*s)            (3sigma)
2024-09-29 22:46:17 0.138546     8*300   Rc       23.4     Zeiss-1000=20
2024-09-30 19:47:17 1.017543     28*120  R        22.0     AZT-33IK=20
2024-10-01 18:49:59 1.975663     50*120  R        24.0     ZTSh =20
```
Within the INTEGRAL localization circle (Mereghetti et al., GCN 37630) we found no variable sources. Additionally we found several sources which are absent in PS1 catalog but detected in the stacked image of initial Zeiss-10= 00 observations. All of the sources is barely visible in PS1 images. The ta= ble below shows the coordinates of the sources and the R mag =E2=80=8B=E2= =80=8Bobtained for the sources in these three epochs.
```
Source# RA(J2000)   Dec(J2000)  m(Sep.29)  m(Sep.30)  m(Oct.01)=20
1       00:09:34.87 +74:49:05.2 20.95=C2=B10.12 20.88=C2=B10.16 20.73=C2=B1=0.03
2       00:09:35.74 +74:48:55.1 21.83=C2=B10.16 >22        21.86=C2=B10.08
3       00:09:36.67 +74:50:37.0 21.45=C2=B10.15 21.58=C2=B10.20 21.51=C2=B1=0.06
4       00:09:36.70 +74:49:07.7 21.35=C2=B10.10 21.60=C2=B10.23 21.37=C2=B1=0.04
5       00:09:41.59 +74:48:24.1 21.00=C2=B10.11 20.70=C2=B10.15 20.66=C2=B1=0.03
6       00:09:41.98 +74:49:32.5 22.15=C2=B10.16 ~21.6      21.86=C2=B10.04
7       00:09:57.12 +74:50:11.0 21.73=C2=B10.12 ~21.7      21.78=C2=B10.07
8       00:09:58.78 +74:50:05.3 21.80=C2=B10.19 ~21.8      22.10=C2=B10.07
9       00:10:07.25 +74:50:21.8 21.80=C2=B10.15 ~21.8      22.08=C2=B10.07
10      00:10:08.93 +74:49:57.4 21.38=C2=B10.11 21.84=C2=B10.26 21.53=C2=B1=0.04
```
The magnitudes were calibrated against nearby USNO-B1.0 (R2) reference stars and are not corrected for the Galactic extinction. No variability was found among the sources. So we have no evident GRB240929A afterglow candidates, which is in agreement with previously reported observations (Lipunov et al., GCN 37628; Moretti & Pavoni, GCN 37642; Guidorzi et al., GCN 37672).

Back to JG's homepage

Jochen Greiner, last update: 03-Oct-2024 [Disclaimer]