Gamma-ray Burst 240904A

(All information courtesy of the instrument teams.)

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Results of Observations

GCN/BACODINE POSITION NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 04 Sep 24 16:05:13 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     1252402,   Seg_Num: 0
GRB_RA:          136.440d {+09h 05m 46s} (J2000),
                 136.700d {+09h 06m 48s} (current),
                 135.913d {+09h 03m 39s} (1950)
GRB_DEC:         -30.506d {-30d 30' 22"} (J2000),
                 -30.606d {-30d 36' 21"} (current),
                 -30.306d {-30d 18' 19"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       19893 [cnts]    Image_Peak=580 [image_cnts]
TRIGGER_DUR:     8.192 [sec] 
TRIGGER_INDEX:   334     E_range: 25-100 keV
BKG_INTEN:       136122 [cnts]
BKG_TIME:        57765.88 SOD {16:02:45.88} UT
BKG_DUR:         64 [sec]
GRB_DATE:        20557 TJD;   248 DOY;   24/09/04
GRB_TIME:        57859.32 SOD {16:04:19.32} UT
GRB_PHI:         -155.11 [deg]
GRB_THETA:        15.83 [deg]
SOLN_STATUS:     0x3
RATE_SIGNIF:     14.42 [sigma]
IMAGE_SIGNIF:    10.20 [sigma]
MERIT_PARAMS:     +1  +0  +0  +3  +2  +0 -100  +0 -69  +0 
SUN_POSTN:       163.97d {+10h 55m 52s}   +6.83d {+06d 49' 34"}
SUN_DIST:         45.64 [deg]   Sun_angle= 1.8 [hr] (West of Sun)
MOON_POSTN:      180.22d {+12h 00m 52s}   +0.51d {+00d 30' 49"}
MOON_DIST:        51.72 [deg]
MOON_ILLUM:      2 [%]
GAL_COORDS:      255.92, 11.11 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      151.23,-44.58 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT-BAT GRB Coordinates.  
COMMENTS:        This is a rate trigger.  
COMMENTS:        A point_source was found.  
COMMENTS:        This does not match any source in the on-board catalog.  
COMMENTS:        This does not match any source in the ground catalog.  
COMMENTS:        This is a GRB.  
COMMENTS:        This trigger occurred at longitude,latitude = 288.93,-1.23 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Wed 04 Sep 24 16:08:39 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     1252402,   Seg_Num: 0
GRB_RA:          136.440d {+09h 05m 46s} (J2000),
                 136.700d {+09h 06m 48s} (current),
                 135.913d {+09h 03m 39s} (1950)
GRB_DEC:         -30.506d {-30d 30' 22"} (J2000),
                 -30.606d {-30d 36' 21"} (current),
                 -30.306d {-30d 18' 19"} (1950)
GRB_DATE:        20557 TJD;   248 DOY;   24/09/04
GRB_TIME:        57859.32 SOD {16:04:19.32} UT
TRIGGER_INDEX:   334
GRB_PHI:         -155.11 [deg]
GRB_THETA:        15.83 [deg]
DELTA_TIME:      -63.00 [sec]
TRIGGER_DUR:     8.192 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     14.42 [sigma]
IMAGE_SIGNIF:    10.20 [sigma]
LC_URL:          sw01252402000msb.lc
SUN_POSTN:       163.97d {+10h 55m 53s}   +6.83d {+06d 49' 31"}
SUN_DIST:         45.64 [deg]   Sun_angle= 1.8 [hr] (West of Sun)
MOON_POSTN:      180.24d {+12h 00m 58s}   +0.50d {+00d 30' 00"}
MOON_DIST:        51.73 [deg]
MOON_ILLUM:      2 [%]
GAL_COORDS:      255.92, 11.11 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      151.23,-44.58 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT-BAT GRB Lightcurve.  
COMMENTS:           
COMMENTS:        The next comments were copied from the BAT_POS Notice:  
COMMENTS:        This is a rate trigger.  
COMMENTS:        A point_source was found.  
COMMENTS:        This does not match any source in the on-board catalog.  
COMMENTS:        This does not match any source in the ground catalog.  
COMMENTS:        This is a GRB.  
COMMENTS:        This trigger occurred at longitude,latitude = 288.93,-1.23 [deg].

GCN Circular #37383
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
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.

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Jochen Greiner, last update: 05-Sep-2024 [Disclaimer]