Gamma-ray Burst 240502A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

none

Results of Observations

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Thu 02 May 24 05:28:45 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      45
TRIGGER_NUM:     736320526
GRB_RA:          117.150d {+07h 48m 36s} (J2000),
                 117.480d {+07h 49m 55s} (current),
                 116.472d {+07h 45m 53s} (1950)
GRB_DEC:          +8.517d {+08d 31' 00"} (J2000),
                  +8.455d {+08d 27' 16"} (current),
                  +8.642d {+08d 38' 32"} (1950)
GRB_ERROR:       25.75 [deg radius, statistical plus systematic]
GRB_INTEN:       60 [cnts/sec]
DATA_SIGNIF:     5.20 [sigma]
INTEG_TIME:      4.096 [sec]
GRB_DATE:        20432 TJD;   123 DOY;   24/05/02
GRB_TIME:        19721.88 SOD {05:28:41.88} UT
GRB_PHI:         284.00 [deg]
GRB_THETA:        85.00 [deg]
DATA_TIME_SCALE: 4.0960 [sec]
HARD_RATIO:      0.11
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      89%  GRB
2nd_MOST_LIKELY:   9%  Distant Particles
DETECTORS:       0,0,0, 1,1,0, 0,0,0, 0,0,0, 0,0,
SUN_POSTN:        39.87d {+02h 39m 28s}  +15.53d {+15d 31' 45"}
SUN_DIST:         75.89 [deg]   Sun_angle= -5.2 [hr] (East of Sun)
MOON_POSTN:      325.81d {+21h 43m 13s}  -18.08d {-18d 04' 41"}
MOON_DIST:       150.85 [deg]
MOON_ILLUM:      42 [%]
GAL_COORDS:      211.71, 16.55 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      117.52,-12.37 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240502228/quicklook/glg_lc_medres34_bn240502228.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 121.65,-25.27 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Thu 02 May 24 05:29:00 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      57
TRIGGER_NUM:     736320526
GRB_RA:          118.260d {+07h 53m 02s} (J2000),
                 118.607d {+07h 54m 26s} (current),
                 117.545d {+07h 50m 11s} (1950)
GRB_DEC:         +16.700d {+16d 41' 60"} (J2000),
                 +16.635d {+16d 38' 08"} (current),
                 +16.830d {+16d 49' 49"} (1950)
GRB_ERROR:       10.38 [deg radius, statistical only]
DATA_SIGNIF:     5.50 [sigma]
DATA_INTERVAL:   4.096 [sec]
GRB_DATE:        20432 TJD;   123 DOY;   24/05/02
GRB_TIME:        19721.88 SOD {05:28:41.88} UT
GRB_PHI:         286.00 [deg]
GRB_THETA:        93.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   4173 (Gnd S/W Version number)
SUN_POSTN:        39.87d {+02h 39m 28s}  +15.53d {+15d 31' 45"}
SUN_DIST:         75.11 [deg]   Sun_angle= -5.2 [hr] (East of Sun)
MOON_POSTN:      325.81d {+21h 43m 14s}  -18.08d {-18d 04' 38"}
MOON_DIST:       154.02 [deg]
MOON_ILLUM:      42 [%]
GAL_COORDS:      204.33, 20.94 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      117.04, -4.13 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240502228/quicklook/glg_lc_medres34_bn240502228.gif
POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_736320526.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/INTEGRAL NOTICE
NOTICE_DATE:    Thu 02 May 24 05:29:04 UT
NOTICE_TYPE:    INTEGRAL Weak
TRIGGER_NUM:    10671,   Sub_Num: 0
GRB_RA:         113.6228d {+07h 34m 29s} (J2000),
                113.9717d {+07h 35m 53s} (current),
                112.9051d {+07h 31m 37s} (1950)
GRB_DEC:        +16.7230d {+16d 43' 23"} (J2000),
                +16.6683d {+16d 40' 06"} (current),
                +16.8329d {+16d 49' 59"} (1950)
GRB_ERROR:      3.48 [arcmin, radius, statistical only]
GRB_INTEN:      7.14 [sigma]
GRB_TIME:       19720.78 SOD {05:28:40.78} UT
GRB_DATE:       20432 TJD;   123 DOY;   24/05/02
SC_RA:          106.32 [deg] (J2000)
SC_DEC:          10.15 [deg] (J2000)
SUN_POSTN:       39.87d {+02h 39m 28s}  +15.53d {+15d 31' 45"}
SUN_DIST:        70.76 [deg]   Sun_angle= -4.9 [hr] (East of Sun)
MOON_POSTN:     325.81d {+21h 43m 14s}  -18.08d {-18d 04' 37"}
MOON_DIST:      149.62 [deg]
GAL_COORDS:     202.42, 16.88 [deg] galactic lon,lat of the burst
ECL_COORDS:     112.65, -4.88 [deg] ecliptic lon,lat of the burst
COMMENTS:       INTEGRAL GRB Coordinates -- this is the weak/subthreshold trigger notice.  
COMMENTS:       This notice may or may not be followed by a Wakeup/Refined/Offline notice.  
COMMENTS:       Time_Scale=2.0000 and Time_Error=2.0000.  
COMMENTS:       Possibly real GRB event (WEAK detection)  
COMMENTS:          
COMMENTS:       NOTE: This INTEGRAL event is temporally(1.0<100sec) coincident with the FERMI_GBM event (trignum=736320526).

GCN NOTICE

TITLE:          GCN/INTEGRAL NOTICE
NOTICE_DATE:    Thu 02 May 24 05:29:11 UT
NOTICE_TYPE:    INTEGRAL Wakeup
TRIGGER_NUM:    10671,   Sub_Num: 1
GRB_RA:         113.6470d {+07h 34m 35s} (J2000),
                113.9960d {+07h 35m 59s} (current),
                112.9292d {+07h 31m 43s} (1950)
GRB_DEC:        +16.7578d {+16d 45' 28"} (J2000),
                +16.7031d {+16d 42' 11"} (current),
                +16.8679d {+16d 52' 04"} (1950)
GRB_ERROR:      3.27 [arcmin, radius, statistical only]
GRB_INTEN:      8.26 [sigma]
GRB_TIME:       19724.78 SOD {05:28:44.78} UT
GRB_DATE:       20432 TJD;   123 DOY;   24/05/02
SC_RA:          106.32 [deg] (J2000)
SC_DEC:          10.15 [deg] (J2000)
SUN_POSTN:       39.87d {+02h 39m 28s}  +15.53d {+15d 31' 45"}
SUN_DIST:        70.77 [deg]   Sun_angle= -4.9 [hr] (East of Sun)
MOON_POSTN:     325.81d {+21h 43m 14s}  -18.08d {-18d 04' 35"}
MOON_DIST:      149.65 [deg]
GAL_COORDS:     202.40, 16.92 [deg] galactic lon,lat of the burst
ECL_COORDS:     112.67, -4.84 [deg] ecliptic lon,lat of the burst
COMMENTS:       INTEGRAL GRB Coordinates.  
COMMENTS:       Time_Scale=5.0000 and Time_Error=5.0000.  
COMMENTS:       Possibly real GRB event  
COMMENTS:          
COMMENTS:       NOTE: This INTEGRAL event is temporally(3.0<100sec) coincident with the FERMI_GBM event (trignum=736320526).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Thu 02 May 24 05:30:03 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      0
TRIGGER_NUM:     736320526
GRB_RA:          126.760d {+08h 27m 02s} (J2000),
                 127.123d {+08h 28m 30s} (current),
                 126.013d {+08h 24m 03s} (1950)
GRB_DEC:         +25.420d {+25d 25' 12"} (J2000),
                 +25.339d {+25d 20' 19"} (current),
                 +25.585d {+25d 35' 07"} (1950)
GRB_ERROR:       8.49 [deg radius, statistical only]
DATA_SIGNIF:     7.50 [sigma]
DATA_INTERVAL:   13.312 [sec]
GRB_DATE:        20432 TJD;   123 DOY;   24/05/02
GRB_TIME:        19721.88 SOD {05:28:41.88} UT
GRB_PHI:         282.00 [deg]
GRB_THETA:       104.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   41731 (Gnd S/W Version number)
SUN_POSTN:        39.87d {+02h 39m 28s}  +15.53d {+15d 31' 46"}
SUN_DIST:         81.01 [deg]   Sun_angle= -5.8 [hr] (East of Sun)
MOON_POSTN:      325.82d {+21h 43m 16s}  -18.07d {-18d 04' 24"}
MOON_DIST:       161.20 [deg]
MOON_ILLUM:      42 [%]
GAL_COORDS:      198.33, 31.43 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      122.93,  6.08 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240502228/quicklook/glg_lc_medres34_bn240502228.gif
POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_736320526.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(3.0<100sec) coincident with the INTEGRAL event (trignum=10671).

GCN NOTICE

TITLE:          GCN/INTEGRAL NOTICE
NOTICE_DATE:    Thu 02 May 24 05:32:10 UT
NOTICE_TYPE:    INTEGRAL Refined
TRIGGER_NUM:    10671,   Sub_Num: 2
GRB_RA:         113.6608d {+07h 34m 39s} (J2000),
                114.0098d {+07h 36m 02s} (current),
                112.9431d {+07h 31m 46s} (1950)
GRB_DEC:        +16.7448d {+16d 44' 41"} (J2000),
                +16.6900d {+16d 41' 24"} (current),
                +16.8549d {+16d 51' 18"} (1950)
GRB_ERROR:      3.00 [arcmin, radius, statistical only]
GRB_INTEN:      10.40 [sigma]
GRB_TIME:       19727.78 SOD {05:28:47.78} UT
GRB_DATE:       20432 TJD;   123 DOY;   24/05/02
SC_RA:          106.32 [deg] (J2000)
SC_DEC:          10.15 [deg] (J2000)
SUN_POSTN:       39.87d {+02h 39m 29s}  +15.53d {+15d 31' 47"}
SUN_DIST:        70.78 [deg]   Sun_angle= -4.9 [hr] (East of Sun)
MOON_POSTN:     325.84d {+21h 43m 21s}  -18.07d {-18d 03' 55"}
MOON_DIST:      149.63 [deg]
GAL_COORDS:     202.42, 16.92 [deg] galactic lon,lat of the burst
ECL_COORDS:     112.69, -4.85 [deg] ecliptic lon,lat of the burst
COMMENTS:       INTEGRAL GRB Coordinates.  
COMMENTS:       Time_Scale=10.0000 and Time_Error=10.0000.  
COMMENTS:       Possibly real GRB event  
COMMENTS:          
COMMENTS:       NOTE: This INTEGRAL event is temporally(6.0<100sec) coincident with the FERMI_GBM event (trignum=736320526).

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Thu 02 May 24 05:38:01 UT
NOTICE_TYPE:     Fermi-GBM Final Position
RECORD_NUM:      0
TRIGGER_NUM:     736320526
GRB_RA:          124.550d {+08h 18m 12s} (J2000),
                 124.904d {+08h 19m 37s} (current),
                 123.822d {+08h 15m 17s} (1950)
GRB_DEC:         +20.730d {+20d 43' 48"} (J2000),
                 +20.653d {+20d 39' 10"} (current),
                 +20.886d {+20d 53' 11"} (1950)
GRB_ERROR:       7.17 [deg radius, statistical only]
GRB_DATE:        20432 TJD;   123 DOY;   24/05/02
GRB_TIME:        19721.88 SOD {05:28:41.88} UT
GRB_PHI:         282.00 [deg]
GRB_THETA:        99.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   41731 (Gnd S/W Version number)
SUN_POSTN:        39.87d {+02h 39m 30s}  +15.53d {+15d 31' 52"}
SUN_DIST:         80.06 [deg]   Sun_angle= -5.7 [hr] (East of Sun)
MOON_POSTN:      325.89d {+21h 43m 35s}  -18.04d {-18d 02' 35"}
MOON_DIST:       160.04 [deg]
MOON_ILLUM:      42 [%]
GAL_COORDS:      202.67, 27.97 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      122.04,  1.05 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240502228/quicklook/glg_lc_medres34_bn240502228.gif
LOC_URL:         http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240502228/quicklook/glg_locplot_all_bn240502228.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=10671).

GCN Circular #36368
The Fermi GBM team reports the detection of a likely LONG GRB
At 05:28:41 UT on 2 May 2024, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 240502A (trigger 736320526.884406 / 240502228).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 124.6, Dec = 20.7 (J2000 degrees, equivalent to J2000 08h 18m, 20d 41'), with a statistical uncertainty of 7.2 degrees.
The angle from the Fermi LAT boresight is 99.0 degrees.
The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240502228/quicklook/glg_skymap_all_bn240502228.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/bn240502228/quicklook/glg_healpix_all_bn240502228.fit
The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240502228/quicklook/glg_lc_medres34_bn240502228.gif
GCN Circular #36369
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 25 s has been detected by IBAS in the IBIS/ISGRI data at 05:28:37 UT of 2 May 2024.
The refined coordinates (J2000) are:
```
R.A.=  113.629 deg
DEC.=  +16.7244 deg
```
with an uncertainty of 2 arcmin (90% c.l.).
The burst had a fluence of about 4e-7 erg/cmq in the 20-200 keV range
A plot of the light curve will be posted at http://ibas.iasf-milano.inaf.it/IBAS_Results.html

GCN NOTICE

TITLE:          GCN/INTEGRAL NOTICE
NOTICE_DATE:    Thu 02 May 24 06:38:03 UT
NOTICE_TYPE:    INTEGRAL Offline
TRIGGER_NUM:    10671,   Sub_Num: 3
GRB_RA:         113.6290d {+07h 34m 31s} (J2000),
                113.9779d {+07h 35m 55s} (current),
                112.9113d {+07h 31m 39s} (1950)
GRB_DEC:        +16.7243d {+16d 43' 27"} (J2000),
                +16.6696d {+16d 40' 11"} (current),
                +16.8343d {+16d 50' 03"} (1950)
GRB_ERROR:      2.00 [arcmin, radius, statistical only]
GRB_INTEN:      10.40 [sigma]
GRB_TIME:       19727.78 SOD {05:28:47.78} UT
GRB_DATE:       20432 TJD;   123 DOY;   24/05/02
SC_RA:          106.32 [deg] (J2000)
SC_DEC:          10.15 [deg] (J2000)
SUN_POSTN:       39.91d {+02h 39m 39s}  +15.54d {+15d 32' 36"}
SUN_DIST:        70.71 [deg]   Sun_angle= -4.9 [hr] (East of Sun)
MOON_POSTN:     326.47d {+21h 45m 52s}  -17.82d {-17d 48' 56"}
MOON_DIST:      148.99 [deg]
GAL_COORDS:     202.42, 16.89 [deg] galactic lon,lat of the burst
ECL_COORDS:     112.66, -4.88 [deg] ecliptic lon,lat of the burst
COMMENTS:       INTEGRAL GRB Coordinates.  
COMMENTS:       Time_Scale=10.0000 and Time_Error=10.0000.  
COMMENTS:       refined_coordinates_after_offline_analysis  
COMMENTS:          
COMMENTS:       NOTE: This INTEGRAL event is temporally(6.0<100sec) coincident with the FERMI_GBM event (trignum=736320526).

GCN Circular #36375
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 240502A ( Fermi GBM team, GCN 36368) errorbox 46958 sec after notice time and 46965 sec after trigger time at 2024-05-02 18:31:27 UT, with upper limit up to 18.7 mag. The observations began at zenith distance = 62 deg. The sun altitude is -32.6 deg.
The galactic latitude b = 29 deg., longitude l = 203 deg.
Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2441106
We obtain a following upper limits.

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

   46996 | 2024-05-02 18:31:27 |         MASTER-SAAO | (08h 19m 34.86s , +20d 20m 09.8s) |   C |    60 | 13.6 |        
   47758 | 2024-05-02 18:44:09 |         MASTER-SAAO | (08h 15m 33.10s , +18d 15m 45.7s) |   C |    60 | 13.8 |        
   48004 | 2024-05-02 18:48:15 |         MASTER-SAAO | (08h 03m 20.96s , +20d 20m 31.2s) |   C |    60 | 17.3 |        
   48004 | 2024-05-02 18:48:15 |         MASTER-SAAO | (08h 05m 14.40s , +20d 08m 06.3s) |   C |    60 | 17.5 |        
   48163 | 2024-05-02 18:50:54 |         MASTER-SAAO | (08h 25m 58.55s , +22d 14m 31.6s) |   C |    60 | 16.7 |        
   48163 | 2024-05-02 18:50:54 |         MASTER-SAAO | (08h 27m 53.50s , +22d 02m 06.2s) |   C |    60 | 16.5 |        
   48243 | 2024-05-02 18:52:14 |         MASTER-SAAO | (08h 29m 48.77s , +18d 28m 24.0s) |   C |    60 | 17.7 |        
   48243 | 2024-05-02 18:52:14 |         MASTER-SAAO | (08h 31m 41.21s , +18d 15m 58.6s) |   C |    60 | 17.3 |        
   48722 | 2024-05-02 19:00:13 |         MASTER-SAAO | (08h 13m 45.42s , +18d 27m 49.4s) |   C |    60 | 17.0 |        
   48722 | 2024-05-02 19:00:13 |         MASTER-SAAO | (08h 15m 37.44s , +18d 15m 24.0s) |   C |    60 | 17.2 |        
   49011 | 2024-05-02 19:05:03 |         MASTER-SAAO | (08h 19m 32.57s , +20d 21m 04.6s) |   C |    60 | 15.6 |        
   49011 | 2024-05-02 19:05:03 |         MASTER-SAAO | (08h 21m 25.86s , +20d 08m 39.0s) |   C |    60 | 14.6 |        
   49091 | 2024-05-02 19:06:23 |         MASTER-SAAO | (08h 03m 19.49s , +20d 22m 42.1s) |   C |    60 | 13.2 |        
   49091 | 2024-05-02 19:06:23 |         MASTER-SAAO | (08h 05m 12.58s , +20d 10m 15.8s) |   C |    60 | 14.2 |        
   49171 | 2024-05-02 19:07:42 |         MASTER-SAAO | (08h 09m 35.78s , +22d 15m 31.7s) |   C |    60 | 17.9 |        
   49171 | 2024-05-02 19:07:42 |         MASTER-SAAO | (08h 11m 30.29s , +22d 03m 05.6s) |   C |    60 | 17.8 |        
   49251 | 2024-05-02 19:09:02 |         MASTER-SAAO | (08h 26m 00.76s , +22d 17m 00.6s) |   C |    60 | 18.7 |        
   49251 | 2024-05-02 19:09:02 |         MASTER-SAAO | (08h 27m 55.49s , +22d 04m 34.8s) |   C |    60 | 18.6 |        
   49330 | 2024-05-02 19:10:22 |         MASTER-SAAO | (08h 29m 40.82s , +18d 28m 04.1s) |   C |    60 | 18.5 |        
   49330 | 2024-05-02 19:10:22 |         MASTER-SAAO | (08h 31m 33.07s , +18d 15m 38.5s) |   C |    60 | 18.4 |

Filter C is a clear (unfiltred) band.
The observation and reduction will continue. The message may be cited.

GCN Circular #36382
C. de Barra (UCD) and C. Meegan (UAH) report on behalf of the Fermi Gamma-r= ay Burst Monitor Team:
At 05:28:41.88 UT on 02 May 2024, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 240502A (trigger 736320526/240502228) which was also detected by INTEGRAL (S.Mereghetti et al. 2024, GCN 36369).
The Fermi GBM Final Position location (Fermi GBM Team 2024, GCN 36368) is c= onsistent with the INTEGRAL position. The angle from the Fermi LAT boresight is 89.0 degrees
The GBM light curve contains a single emission episode with a duration (T90= ) of about 23 s (50-300 keV). The time-averaged spectrum from T0-4.1 to T0+20= .5 s is best fit by is best fit by a Comptonized Epeak function with Epeak =3D 1= 51.20 +/- 21.40 keV, and alpha =3D 1.56 +/- 1.10
The event fluence (10-1000 keV) in this time interval is (1.3 +/- 0.2)E-06 = erg/cm^2.=20 The 1-sec peak photon flux measured starting from T0+0.38 s in the 10-1000 = keV band is 0.9 +/- 0.2 ph/s/cm^2.=20
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 Pa= ge: https://fermi.gsfc.nasa.gov/ssc/data/access/gbm/
GCN Circular #36384
K. Ackley, A. Kumar, B. Godson, G. Ramsay, B. P. Gompertz, R. Starling, M. J. Dyer, J. Lyman, K. Ulaczyk, F. Jimenez-Ibarra, D. O'Neill, D. Steeghs, D. K. Galloway, V. Dhillon, P. O'Brien, K. Noysena, R. Kotak, R. P. Breton, L. K. Nuttall, E. Pall'e and D. Pollacco report on behalf of the GOTO collaboration:
The Gravitational-wave Optical Transient Observer (GOTO, Steeghs et al. 2022) performed a targeted observation in response to Fermi GBM detected GRB 240502A (Fermi GBM Team, GCN 36368) at 2024-05-02 UT 21:10:27 (at 15.69 hours after trigger). Each set of observations consisted of 4x90s exposures in the GOTO L-band (400-700 nm).
Images were processed immediately after acquisition using the GOTO pipeline. No optical counterpart is detected within the INTEGRAL uncertainty circle (Mereghetti et al. GCN 36369) up to the 5-sigma limit of L > 20.1 mag (AB).
Calibration was performed using ATLAS-REFCAT2 (Tonry et al. 2018) and the magnitude is not corrected for Galactic extinction.
GOTO (https://goto-observatory.org) is a network of telescopes that is principally funded by the STFC and operated at the Roque de los Muchachos Observatory on La Palma, Spain, and Siding Spring Observatory in NSW, Australia, on behalf of a consortium including the University of Warwick, Monash University, Armagh Observatory & Planetarium, the University of Leicester, the University of Sheffield, the National Astronomical Research Institute of Thailand (NARIT), the University of Turku, the University of Portsmouth, the University of Manchester and the Instituto de Astrofisica de Canarias (IAC).
GCN Circular #36406
Anshika Gupta (ARIES), Kuntal Misra (ARIES), Karan Dogra(ARIES) and Dimple (CMI) report:
We observed the field of GRB 240502A detected by Integral (GCN 36369) using the 1.3m Devasthal Fast Optical Telescope (DFOT) located at the Devasthal observatory of Aryabhatta Research Institute of observational sciencES (ARIES), Nainital, India. The observation started on 2024-05-04 at 14:29:05 UTC. Multiple frames of 300 sec exposure were acquired in the R band. We do not detect the optical afterglow within the Intergral uncertainty circle (GCN 36369) upto 4-sigma limit in the stacked image down to a limiting magnitude of 22.4. The photometric calibration is performed using the standard stars from the USNO-B1.0 catalog.
GCN Circular #36519
A. Pal (Konkoly Observatory), M. Dafcikova, J. Ripa, N. Werner (Masaryk U.), M. Ohno (Hiroshima U.), L. Meszaros, B. Csak (Konkoly Observatory), H. Takahashi (Hiroshima U.), F. Munz , M. Topinka, F. Hroch, N. Husarikova, J.-P. Breuer (Masaryk U.), J. Hudec, J. Kapus, M. Frajt, M. Rezenov (Spacemanic s.r.o), R. Laszlo (Needronix), G. Galgoczi (Wigner Research Center/Eotvos U.), N. Uchida (ISAS/JAXA), T. Enoto (Kyoto U.), Zs. Frei (Eotvos U.), Y. Fukazawa, K. Hirose, H. Matake (Hiroshima U.), S. Hisadomi (Nagoya U.), Y. Ichinohe (Rikkyo U.), L. L. Kiss (Konkoly Observatory), T. Mizuno (Hiroshima U.), K. Nakazawa (Nagoya U.), H. Odaka (Univ of Tokyo), K. Torigoe (Hiroshima U.), P. Svoboda, V. Daniel, J. Dudas, M. Junas, J. Gromes (VZLU), I. Vertat (FEL ZCU) -- the VZLUSAT-2/GRB payload collaboration.
The long-duration GRB 240502A (Fermi/GBM detection: GCN 36368; INTEGRAL/IBIS detection: GCN 36369) was detected by the GRB detector on board of the VZLUSAT-2 3U CubeSat (https://www.vzlusat2.cz/en/).
The data acquisition was performed by the GRB detector unit no. 1. The detection was confirmed at the peak time 2024-05-02 05:28:34 UTC. The T90 duration is 9 s and the significance during T90 reaches 5.9 sigma.
The light curve obtained by VZLUSAT-2 is available here: https://vzlusat2.konkoly.hu/static/share/GRB240502A_GCN_VZLUSAT2.pdf
We note that the light curve measured by VZLUSAT-2 is shifted by approximately 5 s with respect to light curves obtained by other missions. The cause of the on-board clock slip is being fixed.
All VZLUSAT-2 detections are listed at: https://monoceros.physics.muni.cz/hea/VZLUSAT-2/. The GRB detectors on VZLUSAT-2 are a demonstration payload for a future CubeSat constellation (Werner et al. Proc. SPIE 2018). Two GRB modules of VZLUSAT-2 are placed in a perpendicular manner and each consists of a 75 x 75 x 5 mm3 CsI scintillator read out by a SiPM array, covering the energy range from ~30 keV to ~1000 keV. VZLUSAT-2 was launched on 2022 January 13 from Cape Canaveral.

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Jochen Greiner, last update: 20-May-2024 [Disclaimer]