GRB 240930A
GCN Circular 37633
Subject
GRB 240930A: Fermi GBM Final Real-time Localization
Date
2024-09-30T04:18:32Z (8 months ago)
From
Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>
Via
email
The Fermi GBM team reports the detection of a likely LONG GRB
At 04:07:53 UT on 30 Sep 2024, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 240930A (trigger 749362078.832228 / 240930172).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 190.7, Dec = -81.9 (J2000 degrees, equivalent to J2000 12h 42m, -81d 54'), with a statistical uncertainty of 1.0 degrees.
The angle from the Fermi LAT boresight is 90.0 degrees.
The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240930172/quicklook/glg_skymap_all_bn240930172.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/bn240930172/quicklook/glg_healpix_all_bn240930172.fit
The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240930172/quicklook/glg_lc_medres34_bn240930172.gif
GCN Circular 37635
Subject
Fermi Gamma-ray Burst Monitor trigger 749362078/240930172 (GRB 240930A) is not a GRB
Date
2024-09-30T04:58:04Z (8 months ago)
From
Cori Fletcher at USRA <cfletcher@usra.edu>
Via
Web form
C. Fletcher (USRA) reports on behalf of the Fermi Gamma-ray Burst Monitor Team:
"The Fermi Gamma-ray Burst Monitor (GBM) trigger 749362078/240930172 (GRB 240930A; GCN 37631) at 04:07:53.83 UT on 30 September 2024, tentatively classified as a GRB, is in fact not due
to a GRB. This trigger is likely due to local particles."
GCN Circular 37636
Subject
Fermi GRB 240930A: Global MASTER-Net observations report
Date
2024-09-30T05:00:35Z (8 months ago)
From
Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>
Via
legacy email
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-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 240930A ( Fermi GBM team, GCN 37633) errorbox 592 sec after notice time and 604 sec after trigger time at 2024-09-30 04:17:58 UT, with upper limit up to 19.9 mag. The observations began at zenith distance = 66 deg. The sun altitude is -56.1 deg.
The galactic latitude b = -19 deg., longitude l = 303 deg.
Real time updated cover map and OT discovered available here:
https://master.sai.msu.ru/site/master2/observ.php?id=2619664
We obtain a following upper limits.
Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment
_________|_____________________|_____________________|____________________________________|_____|_______|_______|________
664 | 2024-09-30 04:17:58 | MASTER-OAFA | (11h 40m 44.68s , -82d 44m 35.9s) | C | 120 | 18.4 |
665 | 2024-09-30 04:17:58 | MASTER-OAFA | (12h 46m 17.12s , -82d 00m 09.9s) | C | 120 | 19.9 |
819 | 2024-09-30 04:20:17 | MASTER-OAFA | (11h 40m 41.23s , -82d 44m 37.7s) | C | 150 | 18.5 |
819 | 2024-09-30 04:20:18 | MASTER-OAFA | (12h 46m 15.24s , -82d 00m 12.8s) | C | 150 | 19.9 |
1004 | 2024-09-30 04:23:07 | MASTER-OAFA | (11h 40m 38.32s , -82d 44m 40.7s) | C | 180 | 18.3 |
1004 | 2024-09-30 04:23:07 | MASTER-OAFA | (12h 46m 13.12s , -82d 00m 16.7s) | C | 180 | 19.6 |
1203 | 2024-09-30 04:26:27 | MASTER-OAFA | (11h 40m 35.13s , -82d 44m 45.0s) | C | 180 | 18.6 |
1204 | 2024-09-30 04:26:27 | MASTER-OAFA | (12h 46m 10.84s , -82d 00m 21.1s) | C | 180 | 19.9 |
1403 | 2024-09-30 04:29:46 | MASTER-OAFA | (11h 40m 32.39s , -82d 44m 49.6s) | C | 180 | 18.5 |
1403 | 2024-09-30 04:29:47 | MASTER-OAFA | (12h 46m 08.46s , -82d 00m 25.2s) | C | 180 | 19.9 |
Filter C is a clear (unfiltred) band.
The observation and reduction will continue.
The message may be cited.