TDRSS lightcurve for Trigger=1337165
Notes:
- 1) None of the TDRSS light curves are background subtracted.
GCN BAT Position Notice
TITLE: GCN/SWIFT NOTICE
NOTICE_DATE: Sat 26 Jul 25 22:49:19 UT
NOTICE_TYPE: Swift-BAT GRB Position
TRIGGER_NUM: 1337165, Seg_Num: 0
GRB_RA: 251.779d {+16h 47m 07s} (J2000),
252.246d {+16h 48m 59s} (current),
250.867d {+16h 43m 28s} (1950)
GRB_DEC: -45.871d {-45d 52' 14"} (J2000),
-45.915d {-45d 54' 52"} (current),
-45.782d {-45d 46' 53"} (1950)
GRB_ERROR: 3.00 [arcmin radius, statistical only]
GRB_INTEN: 419 [cnts] Image_Peak=72 [image_cnts]
TRIGGER_DUR: 0.064 [sec]
TRIGGER_INDEX: 10411 E_range: 15-50 keV
BKG_INTEN: 21362 [cnts]
BKG_TIME: 82131.96 SOD {22:48:51.96} UT
BKG_DUR: 8 [sec]
GRB_DATE: 20882 TJD; 207 DOY; 25/07/26
GRB_TIME: 82145.08 SOD {22:49:05.08} UT
GRB_PHI: -81.05 [deg]
GRB_THETA: 25.16 [deg]
SOLN_STATUS: 0x10D
RATE_SIGNIF: 19.49 [sigma]
IMAGE_SIGNIF: 9.81 [sigma]
MERIT_PARAMS: +0 +0 +2 -4 +1 +0 +0 +1 +61 +0
SUN_POSTN: 126.52d {+08h 26m 05s} +19.21d {+19d 12' 24"}
SUN_DIST: 128.31 [deg] Sun_angle= -8.4 [hr] (East of Sun)
MOON_POSTN: 153.61d {+10h 14m 25s} +12.54d {+12d 32' 15"}
MOON_DIST: 104.95 [deg]
MOON_ILLUM: 5 [%]
GAL_COORDS: 339.54, -0.42 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS: 256.29,-23.30 [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 matches a source in the on-board catalog: Num=14112=CXOU_J1647-4552, delta=0.009 [deg].
COMMENTS: This matches a source in the ground catalog: CXOU_J1647-4552, delta=0.009 [deg].
COMMENTS: This is not a GRB.
COMMENTS: This is an interesting source.
COMMENTS: This trigger occurred at longitude,latitude = 318.50,16.36 [deg].
GCN BAT Lightcurve Notice
TITLE: GCN/SWIFT NOTICE
NOTICE_DATE: Sat 26 Jul 25 23:01:49 UT
NOTICE_TYPE: Swift-BAT GRB Lightcurve
TRIGGER_NUM: 1337165, Seg_Num: 0
GRB_RA: 251.779d {+16h 47m 07s} (J2000),
252.246d {+16h 48m 59s} (current),
250.867d {+16h 43m 28s} (1950)
GRB_DEC: -45.871d {-45d 52' 14"} (J2000),
-45.915d {-45d 54' 52"} (current),
-45.782d {-45d 46' 53"} (1950)
GRB_DATE: 20882 TJD; 207 DOY; 25/07/26
GRB_TIME: 82145.16 SOD {22:49:05.16} UT
TRIGGER_INDEX: 10411
GRB_PHI: -81.05 [deg]
GRB_THETA: 25.16 [deg]
DELTA_TIME: -39.00 [sec]
TRIGGER_DUR: 0.064 [sec]
SOLN_STATUS: 0x10D
RATE_SIGNIF: 19.49 [sigma]
IMAGE_SIGNIF: 9.81 [sigma]
LC_URL: sw01337165000msb.lc
GCN template for BAT paragraph
Click here!
At 22:49:05 UT, the Swift Burst Alert Telescope (BAT) triggered and
located GRB 250726 ***A*** (trigger=1337165). Swift slewed immediately to the burst.
The BAT on-board calculated location is
RA, Dec 251.779, -45.871 which is
RA(J2000) = 16h 47m 07s
Dec(J2000) = -45d 52' 14"
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 ~2703 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
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: 0.128 s +/- 0.286217 s
Estimated T50 duration: 0.128 s +/- 0.128 s
Estimated Peak Interval: MET 775262981.37599993 +/- 0.500000 s
Estimated background rate 1: 4185.332 near MET 775262969.024000 s
Estimated background rate 2: 4157.539 near MET 775263074.048000 s
Estimated total duration: 0.128 s (for data selection)
(from MET 775262981.248000 to MET 775262981.376000)
Estimated total fluence: 286.391766 count
Created GTI with 3 entries
------------------------------------------
Search for this GRB position to the previously BAT detected GRB positions (search radius within 5 arcmin)
bat_grb_pos_cat.sh 251.779 -45.871 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 251.779 -45.871
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 7 26 23 102.800626 14.950042
Obj: 2025 7 26 23 333.574705 -2.117409
the object visibility at GSFC, Greenbelt, Maryland
MMT Observatory, Mt. Hopkins, Arizona
TimeUT Azimuth Elevation
Sun: 2025 7 26 23 88.034832 41.870552
Obj: 2025 7 26 23 316.894879 -12.245687
the object visibility at MMT, Mt. Hopkins, Arizona
Hale Telescope, Palomar Mountain, California
TimeUT Azimuth Elevation
Sun: 2025 7 26 23 82.797960 46.769586
Obj: 2025 7 26 23 314.310407 -16.964840
the object visibility at Hale Telescope, Palomar Mt., California
Mauna Kea, Hawaii
TimeUT Azimuth Elevation
Sun: 2025 7 26 23 86.128109 82.999121
Obj: 2025 7 26 23 312.626127 -33.685416
the object visibility at Mauna Kea, Hawaii
Siding Spring Obs., Australia
TimeUT Azimuth Elevation
Sun: 2025 7 26 23 229.085571 21.579434
Obj: 2025 7 26 23 355.574002 -12.629177
the object visibility at Siding Spring Obs., Australia
Tokyo, Japan
TimeUT Azimuth Elevation
Sun: 2025 7 26 23 267.090206 31.235638
Obj: 2025 7 26 23 31.370529 -76.045240
the object visibility at Tokyo, Japan
William Herschel Telescope, La Palma, Canary Islands, Spain
TimeUT Azimuth Elevation
Sun: 2025 7 26 23 140.630412 -31.342488
Obj: 2025 7 26 23 13.643532 13.276909
the object visibility at William Hershel Telescope, La Palma, Canary Islands, Spain
Gemini South, Cerro Pachon, Chile
TimeUT Azimuth Elevation
Sun: 2025 7 26 23 105.873260 -11.157988
Obj: 2025 7 26 23 310.260973 59.474581
the object visibility at Gemini South, Cerro Pachon, Chile
The data/results are in /local/data/bat1/prebascript/trigger1337165/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 Jul 26 19:02:42 EDT 2025