TDRSS lightcurve for Trigger=1347179
Notes:
- 1) None of the TDRSS light curves are background subtracted.
GCN BAT Position Notice
TITLE: GCN/SWIFT NOTICE
NOTICE_DATE: Thu 04 Sep 25 17:37:30 UT
NOTICE_TYPE: Swift-BAT GRB Position
TRIGGER_NUM: 1347179, Seg_Num: 0
GRB_RA: 84.358d {+05h 37m 26s} (J2000),
84.696d {+05h 38m 47s} (current),
83.700d {+05h 34m 48s} (1950)
GRB_DEC: +3.584d {+03d 35' 04"} (J2000),
+3.598d {+03d 35' 53"} (current),
+3.556d {+03d 33' 20"} (1950)
GRB_ERROR: 3.00 [arcmin radius, statistical only]
GRB_INTEN: 3248 [cnts] Image_Peak=195 [image_cnts]
TRIGGER_DUR: 1.024 [sec]
TRIGGER_INDEX: 146 E_range: 25-100 keV
BKG_INTEN: 17392 [cnts]
BKG_TIME: 63411.73 SOD {17:36:51.73} UT
BKG_DUR: 8 [sec]
GRB_DATE: 20922 TJD; 247 DOY; 25/09/04
GRB_TIME: 63423.05 SOD {17:37:03.05} UT
GRB_PHI: -6.64 [deg]
GRB_THETA: 13.62 [deg]
SOLN_STATUS: 0x3
RATE_SIGNIF: 20.42 [sigma]
IMAGE_SIGNIF: 8.77 [sigma]
MERIT_PARAMS: +1 +0 +0 +0 +2 -1 +0 +0 -18 +0
SUN_POSTN: 163.81d {+10h 55m 14s} +6.89d {+06d 53' 31"}
SUN_DIST: 78.77 [deg] Sun_angle= 5.3 [hr] (West of Sun)
MOON_POSTN: 307.04d {+20h 28m 11s} -22.93d {-22d 55' 44"}
MOON_DIST: 134.73 [deg]
MOON_ILLUM: 89 [%]
GAL_COORDS: 201.00,-14.68 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS: 84.02,-19.74 [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 = 220.86,-19.68 [deg].
GCN BAT Lightcurve Notice
TITLE: GCN/SWIFT NOTICE
NOTICE_DATE: Thu 04 Sep 25 17:54:38 UT
NOTICE_TYPE: Swift-BAT GRB Lightcurve
TRIGGER_NUM: 1347179, Seg_Num: 0
GRB_RA: 84.358d {+05h 37m 26s} (J2000),
84.696d {+05h 38m 47s} (current),
83.700d {+05h 34m 48s} (1950)
GRB_DEC: +3.584d {+03d 35' 04"} (J2000),
+3.598d {+03d 35' 53"} (current),
+3.556d {+03d 33' 20"} (1950)
GRB_DATE: 20922 TJD; 247 DOY; 25/09/04
GRB_TIME: 63423.05 SOD {17:37:03.05} UT
TRIGGER_INDEX: 146
GRB_PHI: -6.64 [deg]
GRB_THETA: 13.62 [deg]
DELTA_TIME: -11.00 [sec]
TRIGGER_DUR: 1.024 [sec]
SOLN_STATUS: 0x3
RATE_SIGNIF: 20.42 [sigma]
IMAGE_SIGNIF: 8.77 [sigma]
LC_URL: sw01347179000msb.lc
GCN template for BAT paragraph
Click here!
At 17:37:03 UT, the Swift Burst Alert Telescope (BAT) triggered and
located GRB 250904 ***A*** (trigger=1347179). Swift slewed immediately to the burst.
The BAT on-board calculated location is
RA, Dec 84.358, +3.584 which is
RA(J2000) = 05h 37m 26s
Dec(J2000) = +03d 35' 04"
with an uncertainty of 3 arcmin (radius, 90% containment, including
systematic uncertainty). The BAT light curve showed a [**double-peaked**]
structure with a duration of about TTT sec. The peak count rate
was ~1921 counts/sec (15-350 keV), at ~8 sec after the trigger.
Test version of draft template
Initial TDRSS lightcurve and spacecraft attitude plot
TDRSS lightcurve from T0-30 to T0+50 (zoom in)
TDRSS light curve from T0-1 to T0+2 (More zoom in)
1.6s binned TDRSS light curve
Tilan's background subtracted TDRSS light curves
Extended TDRSS light curve and spacecraft attitude plot(s)
Extended TDRSS lc No.1
Extended TDRSS lc No.2
Extended TDRSS lc No.3
Extended TDRSS lc No.4
TDRSS extended lightcurve from T0-1 to T0+2
T50 and T90 calculation
******************************************
battblocks v1.18
------------------------------------------
Input Data: bat_raw_lc.fits
Output GTI: bb.gti
Events to Skip: 128 Changepoint log(prob) Prior: 6.000000
Internal Tick: 1.000000e-04 s
Lookback time: 0 s
Bkg. Subtract?: yes (for fluence/T50/T90 calculations)
------------------------------------------
Estimated T90 duration: 29.184 s +/- 1.03197 s
Estimated T50 duration: 12.16 s +/- 0.256 s
Estimated Peak Interval: MET 778700259.58399987 +/- 0.500000 s
Estimated background rate 1: 4137.752 near MET 778700245.120000 s
Estimated background rate 2: 4110.344 near MET 778700375.488000 s
Estimated total duration: 50.816 s (for data selection)
(from MET 778700255.040000 to MET 778700305.856000)
Estimated total fluence: 26989.240521 count
Created GTI with 7 entries
------------------------------------------
Search for this GRB position to the previously BAT detected GRB positions (search radius within 5 arcmin)
bat_grb_pos_cat.sh 84.358 3.584 0.083
No match
Search for this GRB position to the source locations in BAT transient monitor (search radius within 12 arcmin)
python compare_catalog.py 84.358 3.584
No match
Link to SIMBAD
Click here for the SIMBAD search!
Frank's UVOT result
Click here!
Frank's UVOT Blinking images
Click here!
Elevation angle of GRB/Sun at the ground telescope locations
GSFC, Greenbelt, Maryland
TimeUT Azimuth Elevation
Sun: 2025 9 4 17 356.080242 57.823332
Obj: 2025 9 4 17 84.560785 12.323096
the object visibility at GSFC, Greenbelt, Maryland
MMT Observatory, Mt. Hopkins, Arizona
TimeUT Azimuth Elevation
Sun: 2025 9 4 17 298.612300 48.193550
Obj: 2025 9 4 17 64.129641 40.825713
the object visibility at MMT, Mt. Hopkins, Arizona
Hale Telescope, Palomar Mountain, California
TimeUT Azimuth Elevation
Sun: 2025 9 4 17 294.605779 42.934762
Obj: 2025 9 4 17 57.296771 44.415897
the object visibility at Hale Telescope, Palomar Mt., California
Mauna Kea, Hawaii
TimeUT Azimuth Elevation
Sun: 2025 9 4 17 266.582215 11.030871
Obj: 2025 9 4 17 354.345405 73.678118
the object visibility at Mauna Kea, Hawaii
Siding Spring Obs., Australia
TimeUT Azimuth Elevation
Sun: 2025 9 4 17 291.369260 -42.421407
Obj: 2025 9 4 17 248.171048 25.513470
the object visibility at Siding Spring Obs., Australia
Tokyo, Japan
TimeUT Azimuth Elevation
Sun: 2025 9 4 17 217.228509 -41.358644
Obj: 2025 9 4 17 276.360098 15.447920
the object visibility at Tokyo, Japan
William Herschel Telescope, La Palma, Canary Islands, Spain
TimeUT Azimuth Elevation
Sun: 2025 9 4 17 79.413306 32.184880
Obj: 2025 9 4 17 120.000830 -36.839097
the object visibility at William Hershel Telescope, La Palma, Canary Islands, Spain
Gemini South, Cerro Pachon, Chile
TimeUT Azimuth Elevation
Sun: 2025 9 4 17 173.784146 52.561721
Obj: 2025 9 4 17 96.709674 4.256593
the object visibility at Gemini South, Cerro Pachon, Chile
The data/results are in /local/data/bat1/prebascript/trigger1347179/tdrss_ql/
bat_raw_lc.fits : TDRSS FITS light curve from GCN
gcn_position.txt : GCN BAT position notice
ratelc_tdrss.qdp : QDP file of the TDRSS light curve
tdrss_lc.gif : GIF TDRSS light curve
sc_att.qdp : QDP file of the spacecraft attitude
sc_att.gif : GIF spacecraft attitude
bb.gti : Bayesian block GTI file (battblocks)
dur.gti : Duration GTI file (battblocks)
battblocks.log : Output log of battblocks
Plot creation:
Thu Sep 4 13:55:22 EDT 2025