GRB 240904A
GCN Circular 37383
Subject
GRB 240904A: Swift detection of a burst
Date
2024-09-04T16:17:27Z (9 months ago)
From
K.L. Page at U Leicester <klp5@leicester.ac.uk>
Via
email
M. H. Siegel (PSU), S. Dichiara (PSU), R. Gupta (NASA GSFC),
J. A. Kennea (PSU), M. J. Moss (GSFC), K. L. Page (U Leicester) and
M. A. Williams (PSU) report on behalf of the Neil Gehrels Swift
Observatory Team:
At 16:04:19 UT, the Swift Burst Alert Telescope (BAT) triggered and
located GRB 240904A (trigger=1252402).
The BAT on-board calculated location is
RA, Dec 136.440, -30.506 which is
RA(J2000) = 09h 05m 46s
Dec(J2000) = -30d 30' 22"
with an uncertainty of 3 arcmin (radius, 90% containment, including
systematic uncertainty). The BAT light curve showed a complex
structure with many pulses and a total duration of about 22 sec.
The peak count rate was ~800 counts/sec (15-350 keV), at ~4 sec after
the trigger.
Due to a Sun observing constraint, Swift cannot slew to the BAT
position until 13:50 UT on 2024 September 10. There will thus be no XRT
or UVOT data for this trigger before this time.
Burst Advocate for this burst is M. H. Siegel (siegel AT swift.psu.edu).
Please contact the BA by email if you require additional information
regarding Swift followup of this burst. In extremely urgent cases, after
trying the Burst Advocate, you can contact the Swift PI by phone (see
Swift TOO web site for information: http://www.swift.psu.edu/)
GCN Circular 37387
Subject
Swift GRB 240904A: Global MASTER-Net observations report
Date
2024-09-05T02:24:28Z (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) was pointed to the Swift GRB 240904A ( M. H. Siegel et al., GCN 37383) errorbox 36516 sec after notice time and 36574 sec after trigger time at 2024-09-05 02:13:53 UT, with upper limit up to 17.3 mag. The observations began at zenith distance = 80 deg. The sun altitude is -33.8 deg.
The galactic latitude b = 11 deg., longitude l = 256 deg.
Real time updated cover map and OT discovered available here:
https://master.sai.msu.ru/site/master2/observ.php?id=2589299
We obtain a following upper limits.
Tmid-T0 | Site |Filt.| Expt. | Limit| Comment
_________|_____________________|_____|_______|______|________
36664 | MASTER-SAAO | C | 180 | 17.3 |
Filter C is a clear (unfiltred) band.
The observation and reduction will continue.
The message may be cited.