GRB 240905D
GCN Circular 37392
Subject
GRB 240905D: Fermi GBM Final Real-time Localization
Date
2024-09-05T10:48:16Z (9 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 10:37:30 UT on 5 Sep 2024, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 240905D (trigger 747225455.094518 / 240905443).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 215.1, Dec = -65.5 (J2000 degrees, equivalent to J2000 14h 20m, -65d 30'), with a statistical uncertainty of 4.8 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/2024/bn240905443/quicklook/glg_skymap_all_bn240905443.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/bn240905443/quicklook/glg_healpix_all_bn240905443.fit
The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240905443/quicklook/glg_lc_medres34_bn240905443.gif
GCN Circular 37395
Subject
GRB 240905D: AstroSat CZTI detection
Date
2024-09-05T17:50:08Z (9 months ago)
From
Gaurav Waratkar at IIT Bombay <gauravwaratkar@iitb.ac.in>
Via
Web form
S. Srijan (IITB), A. Dasgupta (BITS Pilani, Hyderabad), G. Waratkar (IITB), J. Joshi (IUCAA), A. Vibhute (IUCAA), V. Bhalerao (IITB), D. Bhattacharya (Ashoka University/IUCAA), A. R. Rao (IUCAA/TIFR), and S. Vadawale (PRL) report on behalf of the AstroSat CZTI collaboration:
Analysis of AstroSat CZTI data with the CIFT framework (Sharma et al., 2021, JApA, 42, 73) showed the detection of a long-duration GRB 240905D which was also detected by Fermi/GBM (Fermi GBM team, GCN Circ. 37392).
The source was clearly detected in the CZT detectors in the 20-200 keV energy range. The light curve peaks at 2024-09-05 10:37:40 UTC. The measured peak count rate associated with the burst is 180 (+34, -38) counts/s above the background in the combined data of three (out of four) quadrants, with a total of 845 (+199, -210) counts. The local mean background count rate was 280 (+4, -4) counts/s. Using cumulative rates, we measure a T90 of 16 (+2, -2) s. We caution that there is a 0.3 s readout dead time in CZTI data just before the burst. Hence, the T90 can be as large as 19 s for this GRB, with a lower limit of 14 s as estimated above by cumulative rates.
CZTI is built by a TIFR-led consortium of institutes across India, including VSSC, URSC, IUCAA, SAC, and PRL. The Indian Space Research Organisation funded, managed, and facilitated the project.
CZTI GRB detections are reported regularly on the payload site at:
http://astrosat.iucaa.in/czti/?q=grb
GCN Circular 37411
Subject
Fermi GRB 240905D: Global MASTER-Net observations report
Date
2024-09-06T12:16:19Z (9 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-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 240905D ( Fermi GBM team, GCN 37392) errorbox 26527 sec after notice time and 26560 sec after trigger time at 2024-09-05 18:00:10 UT, with upper limit up to 17.7 mag. The observations began at zenith distance = 53 deg. The sun altitude is -21.0 deg.
The galactic latitude b = -5 deg., longitude l = 312 deg.
Real time updated cover map and OT discovered available here:
https://master.sai.msu.ru/site/master2/observ.php?id=2590346
We obtain a following upper limits.
Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment
_________|_____________________|_____________________|____________________________________|_____|_______|_______|________
26590 | 2024-09-05 18:00:10 | MASTER-SAAO | (13h 48m 44.29s , -70d 55m 43.7s) | C | 60 | 17.7 |
26673 | 2024-09-05 18:01:32 | MASTER-SAAO | (14h 13m 17.55s , -70d 57m 55.2s) | C | 60 | 17.7 |
Filter C is a clear (unfiltred) band.
The observation and reduction will continue.
The message may be cited.