TDRSS lightcurve for Trigger=1348587
Notes:
- 1) None of the TDRSS light curves are background subtracted.
GCN BAT Position Notice
TITLE: GCN/SWIFT NOTICE
NOTICE_DATE: Thu 11 Sep 25 01:28:23 UT
NOTICE_TYPE: Swift-BAT GRB Position
TRIGGER_NUM: 1348587, Seg_Num: 0
GRB_RA: 263.762d {+17h 35m 03s} (J2000),
264.135d {+17h 36m 32s} (current),
263.038d {+17h 32m 09s} (1950)
GRB_DEC: -16.844d {-16d 50' 36"} (J2000),
-16.859d {-16d 51' 31"} (current),
-16.812d {-16d 48' 41"} (1950)
GRB_ERROR: 3.00 [arcmin radius, statistical only]
GRB_INTEN: 11003 [cnts] Image_Peak=310 [image_cnts]
TRIGGER_DUR: 4.096 [sec]
TRIGGER_INDEX: 301 E_range: 25-100 keV
BKG_INTEN: 91660 [cnts]
BKG_TIME: 5211.69 SOD {01:26:51.69} UT
BKG_DUR: 40 [sec]
GRB_DATE: 20929 TJD; 254 DOY; 25/09/11
GRB_TIME: 5266.15 SOD {01:27:46.15} UT
GRB_PHI: -4.69 [deg]
GRB_THETA: 50.01 [deg]
SOLN_STATUS: 0x3
RATE_SIGNIF: 13.92 [sigma]
IMAGE_SIGNIF: 9.60 [sigma]
MERIT_PARAMS: +1 +0 +0 +2 +2 +0 +0 +1 +9 +0
SUN_POSTN: 169.50d {+11h 18m 00s} +4.52d {+04d 30' 59"}
SUN_DIST: 95.74 [deg] Sun_angle= -6.3 [hr] (East of Sun)
MOON_POSTN: 29.65d {+01h 58m 37s} +15.97d {+15d 58' 22"}
MOON_DIST: 127.91 [deg]
MOON_ILLUM: 86 [%]
GAL_COORDS: 9.04, 8.43 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS: 263.99, 6.47 [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 = 334.85,-11.22 [deg].
GCN BAT Lightcurve Notice
TITLE: GCN/SWIFT NOTICE
NOTICE_DATE: Thu 11 Sep 25 01:45:02 UT
NOTICE_TYPE: Swift-BAT GRB Lightcurve
TRIGGER_NUM: 16629759, Seg_Num: 0
GRB_RA: 263.762d {+17h 35m 03s} (J2000),
264.135d {+17h 36m 32s} (current),
263.038d {+17h 32m 09s} (1950)
GRB_DEC: -16.844d {-16d 50' 36"} (J2000),
-16.859d {-16d 51' 31"} (current),
-16.812d {-16d 48' 41"} (1950)
GRB_DATE: 20929 TJD; 254 DOY; 25/09/11
GRB_TIME: 5266.15 SOD {01:27:46.15} UT
TRIGGER_INDEX: 301
GRB_PHI: -4.69 [deg]
GRB_THETA: 50.01 [deg]
DELTA_TIME: 2572.00 [sec]
TRIGGER_DUR: 4.096 [sec]
SOLN_STATUS: 0x3
RATE_SIGNIF: 0.00 [sigma]
IMAGE_SIGNIF: 0.00 [sigma]
LC_URL: sw01348587000msb.lc
GCN template for BAT paragraph
Click here!
At 01:27:46 UT, the Swift Burst Alert Telescope (BAT) triggered and
located GRB 250911 ***A*** (trigger=1348587). Swift slewed immediately to the burst.
The BAT on-board calculated location is
RA, Dec 263.762, -16.844 which is
RA(J2000) = 17h 35m 03s
Dec(J2000) = -16d 50' 36"
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 ~2604 counts/sec (15-350 keV), at ~101 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
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: 12.288 s +/- 0.461511 s
Estimated T50 duration: 7.936 s +/- 0.362039 s
Estimated Peak Interval: MET 779246903.93599987 +/- 0.500000 s
Estimated background rate 1: 4616.498 near MET 779246889.280000 s
Estimated background rate 2: 4800.163 near MET 779246960.320000 s
Estimated total duration: 14.08 s (for data selection)
(from MET 779246900.160000 to MET 779246914.240000)
Estimated total fluence: 5461.954015 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 263.762 -16.844 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 263.762 -16.844
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 11 1 112.334960 -18.658834
Obj: 2025 9 11 1 26.443355 29.832476
the object visibility at GSFC, Greenbelt, Maryland
MMT Observatory, Mt. Hopkins, Arizona
TimeUT Azimuth Elevation
Sun: 2025 9 11 1 90.947617 7.060405
Obj: 2025 9 11 1 347.124684 40.449913
the object visibility at MMT, Mt. Hopkins, Arizona
Hale Telescope, Palomar Mountain, California
TimeUT Azimuth Elevation
Sun: 2025 9 11 1 87.434512 12.082088
Obj: 2025 9 11 1 340.361846 37.435119
the object visibility at Hale Telescope, Palomar Mt., California
Mauna Kea, Hawaii
TimeUT Azimuth Elevation
Sun: 2025 9 11 1 73.812959 48.269667
Obj: 2025 9 11 1 300.473282 24.846512
the object visibility at Mauna Kea, Hawaii
Siding Spring Obs., Australia
TimeUT Azimuth Elevation
Sun: 2025 9 11 1 205.351602 51.197899
Obj: 2025 9 11 1 295.062672 -7.649209
the object visibility at Siding Spring Obs., Australia
Tokyo, Japan
TimeUT Azimuth Elevation
Sun: 2025 9 11 1 307.741617 47.740254
Obj: 2025 9 11 1 263.655076 -39.642515
the object visibility at Tokyo, Japan
William Herschel Telescope, La Palma, Canary Islands, Spain
TimeUT Azimuth Elevation
Sun: 2025 9 11 1 175.364668 -56.653624
Obj: 2025 9 11 1 71.810911 -2.003832
the object visibility at William Hershel Telescope, La Palma, Canary Islands, Spain
Gemini South, Cerro Pachon, Chile
TimeUT Azimuth Elevation
Sun: 2025 9 11 1 75.295776 -31.715010
Obj: 2025 9 11 1 109.678253 59.746393
the object visibility at Gemini South, Cerro Pachon, Chile
The data/results are in /local/data/bat1/prebascript/trigger1348587/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 10 21:46:23 EDT 2025