TDRSS lightcurve for Trigger=1351039
Notes:
- 1) None of the TDRSS light curves are background subtracted.
GCN BAT Position Notice
TITLE: GCN/SWIFT NOTICE
NOTICE_DATE: Sat 20 Sep 25 15:25:36 UT
NOTICE_TYPE: Swift-BAT GRB Position
TRIGGER_NUM: 1351039, Seg_Num: 0
GRB_RA: 51.459d {+03h 25m 50s} (J2000),
51.725d {+03h 26m 54s} (current),
50.942d {+03h 23m 46s} (1950)
GRB_DEC: -29.646d {-29d 38' 44"} (J2000),
-29.557d {-29d 33' 23"} (current),
-29.820d {-29d 49' 12"} (1950)
GRB_ERROR: 3.00 [arcmin radius, statistical only]
GRB_INTEN: 5851 [cnts] Image_Peak=562 [image_cnts]
TRIGGER_DUR: 1.024 [sec]
TRIGGER_INDEX: 152 E_range: 25-100 keV
BKG_INTEN: 15971 [cnts]
BKG_TIME: 55499.63 SOD {15:24:59.63} UT
BKG_DUR: 8 [sec]
GRB_DATE: 20938 TJD; 263 DOY; 25/09/20
GRB_TIME: 55517.42 SOD {15:25:17.42} UT
GRB_PHI: 155.62 [deg]
GRB_THETA: 47.60 [deg]
SOLN_STATUS: 0x20000003
RATE_SIGNIF: 89.06 [sigma]
IMAGE_SIGNIF: 17.27 [sigma]
MERIT_PARAMS: +1 +0 +0 +0 +2 +5 +0 +0 +52 +0
SUN_POSTN: 178.09d {+11h 52m 22s} +0.83d {+00d 49' 37"}
SUN_DIST: 121.52 [deg] Sun_angle= 8.4 [hr] (West of Sun)
MOON_POSTN: 165.59d {+11h 02m 22s} +6.49d {+06d 29' 31"}
MOON_DIST: 113.92 [deg]
MOON_ILLUM: 1 [%]
GAL_COORDS: 226.47,-56.10 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS: 38.25,-46.40 [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 = 99.79,-20.63 [deg].
COMMENTS:
COMMENTS: NOTE: This BAT event is temporally(0.0<100sec) coincident with the FERMI_GBM event (trignum=780074722).
GCN BAT Lightcurve Notice
TITLE: GCN/SWIFT NOTICE
NOTICE_DATE: Sat 20 Sep 25 15:42:27 UT
NOTICE_TYPE: Swift-BAT GRB Lightcurve
TRIGGER_NUM: 1351039, Seg_Num: 0
GRB_RA: 51.459d {+03h 25m 50s} (J2000),
51.725d {+03h 26m 54s} (current),
50.942d {+03h 23m 46s} (1950)
GRB_DEC: -29.646d {-29d 38' 44"} (J2000),
-29.557d {-29d 33' 23"} (current),
-29.820d {-29d 49' 12"} (1950)
GRB_DATE: 20938 TJD; 263 DOY; 25/09/20
GRB_TIME: 55517.42 SOD {15:25:17.42} UT
TRIGGER_INDEX: 152
GRB_PHI: 155.62 [deg]
GRB_THETA: 47.60 [deg]
DELTA_TIME: -18.00 [sec]
TRIGGER_DUR: 1.024 [sec]
SOLN_STATUS: 0x3
RATE_SIGNIF: 89.06 [sigma]
IMAGE_SIGNIF: 17.27 [sigma]
LC_URL: sw01351039000msb.lc
GCN template for BAT paragraph
Click here!
At 15:25:17 UT, the Swift Burst Alert Telescope (BAT) triggered and
located GRB 250920 ***A*** (trigger=1351039). Swift slewed immediately to the burst.
The BAT on-board calculated location is
RA, Dec 51.459, -29.646 which is
RA(J2000) = 03h 25m 50s
Dec(J2000) = -29d 38' 44"
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 ~8742 counts/sec (15-350 keV), at ~0 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: 38.144 s +/- 0.729712 s
Estimated T50 duration: 18.944 s +/- 9.056 s
Estimated Peak Interval: MET 780074779.26399994 +/- 0.500000 s
Estimated background rate 1: 4046.115 near MET 780074741.440000 s
Estimated background rate 2: 3977.190 near MET 780074867.840000 s
Estimated total duration: 42.88 s (for data selection)
(from MET 780074753.280000 to MET 780074796.160000)
Estimated total fluence: 61709.652602 count
Created GTI with 30 entries
------------------------------------------
Search for this GRB position to the previously BAT detected GRB positions (search radius within 5 arcmin)
bat_grb_pos_cat.sh 51.459 -29.646 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 51.459 -29.646
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 20 15 316.063204 42.602492
Obj: 2025 9 20 15 69.166325 -22.185202
the object visibility at GSFC, Greenbelt, Maryland
MMT Observatory, Mt. Hopkins, Arizona
TimeUT Azimuth Elevation
Sun: 2025 9 20 15 283.203719 21.756946
Obj: 2025 9 20 15 50.250587 5.261620
the object visibility at MMT, Mt. Hopkins, Arizona
Hale Telescope, Palomar Mountain, California
TimeUT Azimuth Elevation
Sun: 2025 9 20 15 280.195796 16.478206
Obj: 2025 9 20 15 46.496898 7.928182
the object visibility at Hale Telescope, Palomar Mt., California
Mauna Kea, Hawaii
TimeUT Azimuth Elevation
Sun: 2025 9 20 15 262.413306 -17.835862
Obj: 2025 9 20 15 18.891118 37.910395
the object visibility at Mauna Kea, Hawaii
Siding Spring Obs., Australia
TimeUT Azimuth Elevation
Sun: 2025 9 20 15 331.708389 -56.319455
Obj: 2025 9 20 15 277.123368 56.991536
the object visibility at Siding Spring Obs., Australia
Tokyo, Japan
TimeUT Azimuth Elevation
Sun: 2025 9 20 15 177.629724 -54.763035
Obj: 2025 9 20 15 314.025228 7.596101
the object visibility at Tokyo, Japan
William Herschel Telescope, La Palma, Canary Islands, Spain
TimeUT Azimuth Elevation
Sun: 2025 9 20 15 49.088244 51.130417
Obj: 2025 9 20 15 81.701378 -67.907956
the object visibility at William Hershel Telescope, La Palma, Canary Islands, Spain
Gemini South, Cerro Pachon, Chile
TimeUT Azimuth Elevation
Sun: 2025 9 20 15 221.687511 50.878150
Obj: 2025 9 20 15 58.917798 5.632560
the object visibility at Gemini South, Cerro Pachon, Chile
The data/results are in /local/data/bat1/prebascript/trigger1351039/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:
Sat Sep 20 11:43:23 EDT 2025