TDRSS lightcurve for Trigger=1351790
Notes:
- 1) None of the TDRSS light curves are background subtracted.
GCN BAT Position Notice
TITLE: GCN/SWIFT NOTICE
NOTICE_DATE: Wed 24 Sep 25 08:19:41 UT
NOTICE_TYPE: Swift-BAT GRB Position
TRIGGER_NUM: 1351790, Seg_Num: 0
GRB_RA: 51.865d {+03h 27m 28s} (J2000),
52.608d {+03h 30m 26s} (current),
50.439d {+03h 21m 45s} (1950)
GRB_DEC: +74.652d {+74d 39' 07"} (J2000),
+74.740d {+74d 44' 23"} (current),
+74.477d {+74d 28' 38"} (1950)
GRB_ERROR: 3.00 [arcmin radius, statistical only]
GRB_INTEN: 28074 [cnts] Image_Peak=350 [image_cnts]
TRIGGER_DUR: 16.384 [sec]
TRIGGER_INDEX: 492 E_range: 50-350 keV
BKG_INTEN: 98301 [cnts]
BKG_TIME: 29811.61 SOD {08:16:51.61} UT
BKG_DUR: 64 [sec]
GRB_DATE: 20942 TJD; 267 DOY; 25/09/24
GRB_TIME: 29909.27 SOD {08:18:29.27} UT
GRB_PHI: -165.17 [deg]
GRB_THETA: 54.75 [deg]
SOLN_STATUS: 0x3
RATE_SIGNIF: 13.92 [sigma]
IMAGE_SIGNIF: 7.59 [sigma]
MERIT_PARAMS: +1 +0 +0 +4 +3 -2 +0 +0 +17 +0
SUN_POSTN: 181.42d {+12h 05m 40s} -0.61d {-00d 36' 49"}
SUN_DIST: 100.10 [deg] Sun_angle= 8.6 [hr] (West of Sun)
MOON_POSTN: 206.33d {+13h 45m 19s} -14.67d {-14d 40' 00"}
MOON_DIST: 118.20 [deg]
MOON_ILLUM: 6 [%]
GAL_COORDS: 132.86, 14.87 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS: 74.12, 53.32 [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 = 278.86,3.66 [deg].
GCN BAT Lightcurve Notice
TITLE: GCN/SWIFT NOTICE
NOTICE_DATE: Wed 24 Sep 25 08:40:42 UT
NOTICE_TYPE: Swift-BAT GRB Lightcurve
TRIGGER_NUM: 1351790, Seg_Num: 0
GRB_RA: 51.865d {+03h 27m 28s} (J2000),
52.608d {+03h 30m 26s} (current),
50.439d {+03h 21m 45s} (1950)
GRB_DEC: +74.652d {+74d 39' 07"} (J2000),
+74.740d {+74d 44' 23"} (current),
+74.477d {+74d 28' 38"} (1950)
GRB_DATE: 20942 TJD; 267 DOY; 25/09/24
GRB_TIME: 29909.27 SOD {08:18:29.27} UT
TRIGGER_INDEX: 492
GRB_PHI: -165.17 [deg]
GRB_THETA: 54.75 [deg]
DELTA_TIME: -5.00 [sec]
TRIGGER_DUR: 16.384 [sec]
SOLN_STATUS: 0x3
RATE_SIGNIF: 13.92 [sigma]
IMAGE_SIGNIF: 7.59 [sigma]
LC_URL: sw01351790000msb.lc
GCN template for BAT paragraph
Click here!
At 08:18:29 UT, the Swift Burst Alert Telescope (BAT) triggered and
located GRB 250924 ***A*** (trigger=1351790). Swift slewed immediately to the burst.
The BAT on-board calculated location is
RA, Dec 51.865, +74.652 which is
RA(J2000) = 03h 27m 28s
Dec(J2000) = +74d 39' 07"
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 ~1106 counts/sec (15-350 keV), at ~17 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: 140.608 s +/- 2.90513 s
Estimated T50 duration: 98.048 s +/- 4.16738 s
Estimated Peak Interval: MET 780394859.83999991 +/- 0.500000 s
Estimated background rate 1: 3846.875 near MET 780394728.800000 s
Estimated background rate 2: 3665.991 near MET 780394911.040000 s
Estimated total duration: 154.56 s (for data selection)
(from MET 780394736.000000 to MET 780394890.560000)
Estimated total fluence: 21260.221568 count
Created GTI with 5 entries
------------------------------------------
Search for this GRB position to the previously BAT detected GRB positions (search radius within 5 arcmin)
bat_grb_pos_cat.sh 51.865 74.652 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 51.865 74.652
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 24 8 237.959900 -34.070099
Obj: 2025 9 24 8 182.948295 54.110415
the object visibility at GSFC, Greenbelt, Maryland
MMT Observatory, Mt. Hopkins, Arizona
TimeUT Azimuth Elevation
Sun: 2025 9 24 8 199.978639 -57.361666
Obj: 2025 9 24 8 193.448608 42.572341
the object visibility at MMT, Mt. Hopkins, Arizona
Hale Telescope, Palomar Mountain, California
TimeUT Azimuth Elevation
Sun: 2025 9 24 8 188.537486 -56.989382
Obj: 2025 9 24 8 195.139304 42.941042
the object visibility at Hale Telescope, Palomar Mt., California
Mauna Kea, Hawaii
TimeUT Azimuth Elevation
Sun: 2025 9 24 8 115.914027 -51.633707
Obj: 2025 9 24 8 196.247019 20.346273
the object visibility at Mauna Kea, Hawaii
Siding Spring Obs., Australia
TimeUT Azimuth Elevation
Sun: 2025 9 24 8 89.178568 -0.210387
Obj: 2025 9 24 8 193.077906 -42.471469
the object visibility at Siding Spring Obs., Australia
Tokyo, Japan
TimeUT Azimuth Elevation
Sun: 2025 9 24 8 80.261595 12.788185
Obj: 2025 9 24 8 186.227323 20.137291
the object visibility at Tokyo, Japan
William Herschel Telescope, La Palma, Canary Islands, Spain
TimeUT Azimuth Elevation
Sun: 2025 9 24 8 277.194316 11.581753
Obj: 2025 9 24 8 164.814930 37.184113
the object visibility at William Hershel Telescope, La Palma, Canary Islands, Spain
Gemini South, Cerro Pachon, Chile
TimeUT Azimuth Elevation
Sun: 2025 9 24 8 293.166810 -32.937050
Obj: 2025 9 24 8 180.183936 -15.112141
the object visibility at Gemini South, Cerro Pachon, Chile
The data/results are in /local/data/bat1/prebascript/trigger1351790/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:
Wed Sep 24 04:41:43 EDT 2025