TDRSS lightcurve for Trigger=1339848
Notes:
- 1) None of the TDRSS light curves are background subtracted.
GCN BAT Position Notice
TITLE: GCN/SWIFT NOTICE
NOTICE_DATE: Tue 05 Aug 25 06:09:29 UT
NOTICE_TYPE: Swift-BAT GRB Position
TRIGGER_NUM: 1339848, Seg_Num: 0
GRB_RA: 24.153d {+01h 36m 37s} (J2000),
24.099d {+01h 36m 24s} (current),
24.280d {+01h 37m 07s} (1950)
GRB_DEC: -81.406d {-81d 24' 22"} (J2000),
-81.276d {-81d 16' 34"} (current),
-81.660d {-81d 39' 37"} (1950)
GRB_ERROR: 3.00 [arcmin radius, statistical only]
GRB_INTEN: 2869 [cnts] Image_Peak=185 [image_cnts]
TRIGGER_DUR: 1.024 [sec]
TRIGGER_INDEX: 146 E_range: 25-100 keV
BKG_INTEN: 16074 [cnts]
BKG_TIME: 22131.90 SOD {06:08:51.90} UT
BKG_DUR: 8 [sec]
GRB_DATE: 20892 TJD; 217 DOY; 25/08/05
GRB_TIME: 22148.86 SOD {06:09:08.86} UT
GRB_PHI: 2.98 [deg]
GRB_THETA: 35.21 [deg]
SOLN_STATUS: 0x3
RATE_SIGNIF: 16.82 [sigma]
IMAGE_SIGNIF: 8.91 [sigma]
MERIT_PARAMS: +1 +0 +0 +0 +2 -1 +0 +0 +33 +0
SUN_POSTN: 135.56d {+09h 02m 14s} +16.88d {+16d 53' 02"}
SUN_DIST: 109.89 [deg] Sun_angle= 7.4 [hr] (West of Sun)
MOON_POSTN: 263.57d {+17h 34m 17s} -28.48d {-28d 28' 36"}
MOON_DIST: 66.20 [deg]
MOON_ILLUM: 83 [%]
GAL_COORDS: 300.87,-35.54 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS: 292.01,-68.67 [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 = 4.84,1.04 [deg].
GCN BAT Lightcurve Notice
TITLE: GCN/SWIFT NOTICE
NOTICE_DATE: Tue 05 Aug 25 06:26:40 UT
NOTICE_TYPE: Swift-BAT GRB Lightcurve
TRIGGER_NUM: 1339848, Seg_Num: 0
GRB_RA: 24.153d {+01h 36m 37s} (J2000),
24.099d {+01h 36m 24s} (current),
24.280d {+01h 37m 07s} (1950)
GRB_DEC: -81.406d {-81d 24' 22"} (J2000),
-81.276d {-81d 16' 34"} (current),
-81.660d {-81d 39' 37"} (1950)
GRB_DATE: 20892 TJD; 217 DOY; 25/08/05
GRB_TIME: 22148.86 SOD {06:09:08.86} UT
TRIGGER_INDEX: 146
GRB_PHI: 2.98 [deg]
GRB_THETA: 35.21 [deg]
DELTA_TIME: 64.00 [sec]
TRIGGER_DUR: 1.024 [sec]
SOLN_STATUS: 0x3
RATE_SIGNIF: 16.82 [sigma]
IMAGE_SIGNIF: 8.91 [sigma]
LC_URL: sw01339848000msb.lc
GCN template for BAT paragraph
Click here!
At 06:09:08 UT, the Swift Burst Alert Telescope (BAT) triggered and
located GRB 250805 ***A*** (trigger=1339848). Swift slewed immediately to the burst.
The BAT on-board calculated location is
RA, Dec 24.153, -81.406 which is
RA(J2000) = 01h 36m 37s
Dec(J2000) = -81d 24' 22"
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 ~1800 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: 23.04 s +/- 1.14576 s
Estimated T50 duration: 7.168 s +/- 0.746362 s
Estimated Peak Interval: MET 776066985.72799993 +/- 0.500000 s
Estimated background rate 1: 3878.750 near MET 776066968.000000 s
Estimated background rate 2: 3637.842 near MET 776067099.840000 s
Estimated total duration: 53.76 s (for data selection)
(from MET 776066974.400000 to MET 776067028.160000)
Estimated total fluence: 9892.878044 count
Created GTI with 8 entries
------------------------------------------
Search for this GRB position to the previously BAT detected GRB positions (search radius within 5 arcmin)
bat_grb_pos_cat.sh 24.153 -81.406 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 24.153 -81.406
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 8 5 6 192.722778 -33.177376
Obj: 2025 8 5 6 351.134840 -33.991371
the object visibility at GSFC, Greenbelt, Maryland
MMT Observatory, Mt. Hopkins, Arizona
TimeUT Azimuth Elevation
Sun: 2025 8 5 6 152.346306 -36.720215
Obj: 2025 8 5 6 349.757039 -31.525228
the object visibility at MMT, Mt. Hopkins, Arizona
Hale Telescope, Palomar Mountain, California
TimeUT Azimuth Elevation
Sun: 2025 8 5 6 146.700199 -32.725907
Obj: 2025 8 5 6 349.542177 -34.070930
the object visibility at Hale Telescope, Palomar Mt., California
Mauna Kea, Hawaii
TimeUT Azimuth Elevation
Sun: 2025 8 5 6 114.226336 -14.291730
Obj: 2025 8 5 6 353.270657 -26.012304
the object visibility at Mauna Kea, Hawaii
Siding Spring Obs., Australia
TimeUT Azimuth Elevation
Sun: 2025 8 5 6 122.848634 17.047369
Obj: 2025 8 5 6 1.875371 22.689527
the object visibility at Siding Spring Obs., Australia
Tokyo, Japan
TimeUT Azimuth Elevation
Sun: 2025 8 5 6 74.536234 49.882955
Obj: 2025 8 5 6 5.514096 -42.007259
the object visibility at Tokyo, Japan
William Herschel Telescope, La Palma, Canary Islands, Spain
TimeUT Azimuth Elevation
Sun: 2025 8 5 6 245.433805 -8.409569
Obj: 2025 8 5 6 0.253551 -20.066148
the object visibility at William Hershel Telescope, La Palma, Canary Islands, Spain
Gemini South, Cerro Pachon, Chile
TimeUT Azimuth Elevation
Sun: 2025 8 5 6 307.056132 -69.478185
Obj: 2025 8 5 6 351.612891 35.467901
the object visibility at Gemini South, Cerro Pachon, Chile
The data/results are in /local/data/bat1/prebascript/trigger1339848/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:
Tue Aug 5 02:27:03 EDT 2025