TDRSS lightcurve for Trigger=1345836

Notes:

GCN BAT Position Notice

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 28 Aug 25 22:33:52 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     1345836,   Seg_Num: 0
GRB_RA:          124.852d {+08h 19m 24s} (J2000),
                 125.144d {+08h 20m 34s} (current),
                 124.283d {+08h 17m 08s} (1950)
GRB_DEC:         -17.388d {-17d 23' 17"} (J2000),
                 -17.470d {-17d 28' 12"} (current),
                 -17.230d {-17d 13' 49"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       2725 [cnts]    Image_Peak=171 [image_cnts]
TRIGGER_DUR:     1.024 [sec] 
TRIGGER_INDEX:   148     E_range: 25-100 keV
BKG_INTEN:       16336 [cnts]
BKG_TIME:        81203.77 SOD {22:33:23.77} UT
BKG_DUR:         8 [sec]
GRB_DATE:        20915 TJD;   240 DOY;   25/08/28
GRB_TIME:        81217.85 SOD {22:33:37.85} UT
GRB_PHI:         -152.09 [deg]
GRB_THETA:        34.78 [deg]
SOLN_STATUS:     0x3
RATE_SIGNIF:     12.52 [sigma]
IMAGE_SIGNIF:    9.25 [sigma]
MERIT_PARAMS:     +1  +0  +0  +0  +2  +0 -100  +0 -74  +0 
SUN_POSTN:       157.65d {+10h 30m 36s}   +9.36d {+09d 21' 33"}
SUN_DIST:         41.85 [deg]   Sun_angle= 2.2 [hr] (West of Sun)
MOON_POSTN:      216.72d {+14h 26m 53s}  -18.98d {-18d 58' 49"}
MOON_DIST:        85.82 [deg]
MOON_ILLUM:      29 [%]
GAL_COORDS:      238.79, 10.47 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      132.29,-35.85 [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 = 207.45,-19.22 [deg].

GCN BAT Lightcurve Notice

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Thu 28 Aug 25 22:51:08 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     1345836,   Seg_Num: 0
GRB_RA:          124.852d {+08h 19m 24s} (J2000),
                 125.144d {+08h 20m 34s} (current),
                 124.283d {+08h 17m 08s} (1950)
GRB_DEC:         -17.388d {-17d 23' 17"} (J2000),
                 -17.470d {-17d 28' 12"} (current),
                 -17.230d {-17d 13' 49"} (1950)
GRB_DATE:        20915 TJD;   240 DOY;   25/08/28
GRB_TIME:        81217.85 SOD {22:33:37.85} UT
TRIGGER_INDEX:   148
GRB_PHI:         -152.09 [deg]
GRB_THETA:        34.78 [deg]
DELTA_TIME:      32.00 [sec]
TRIGGER_DUR:     1.024 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     12.52 [sigma]
IMAGE_SIGNIF:    9.25 [sigma]
LC_URL:          sw01345836000msb.lc

GCN template for BAT paragraph

  • Click here! 
    At 22:33:37 UT, the Swift Burst Alert Telescope (BAT) triggered and
located GRB 250828 ***A*** (trigger=1345836).  Swift slewed immediately to the burst.
The BAT on-board calculated location is 
RA, Dec 124.852, -17.388 which is 
   RA(J2000) = 08h 19m 24s
   Dec(J2000) = -17d 23' 17"
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 ~1695 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: 51.072 s +/- 24.347 s
  Estimated T50 duration: 51.072 s +/- 29.9827 s
  Estimated Peak Interval: MET   778113254.65599990 +/- 0.500000 s
  Estimated background rate 1:     3982.686 near MET 778113242.240000 s
  Estimated background rate 2:     3770.486 near MET 778113372.736000 s
  Estimated total duration: 51.072 s (for data selection)
       (from MET 778113254.080000 to MET 778113305.152000)
  Estimated total fluence: -1882.125184 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 124.852 -17.388 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 124.852 -17.388
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 28 22 86.246698  19.527050
 Obj: 2025 8 28 22 85.077376  -22.302085
  • the object visibility at GSFC, Greenbelt, Maryland 
     
MMT Observatory, Mt. Hopkins, Arizona
      TimeUT       Azimuth     Elevation
 Sun: 2025 8 28 22 66.372023  48.036802
 Obj: 2025 8 28 22 65.020422  6.195431
  • the object visibility at MMT, Mt. Hopkins, Arizona 
     
Hale Telescope, Palomar Mountain, California
      TimeUT       Azimuth     Elevation
 Sun: 2025 8 28 22 58.625751  51.748729
 Obj: 2025 8 28 22 61.264790  9.945549
  • the object visibility at Hale Telescope, Palomar Mt., California 
     
Mauna Kea, Hawaii
      TimeUT       Azimuth     Elevation
 Sun: 2025 8 28 22 329.232643  77.921360
 Obj: 2025 8 28 22 36.398978  44.622227
  • the object visibility at Mauna Kea, Hawaii 
     
Siding Spring Obs., Australia
      TimeUT       Azimuth     Elevation
 Sun: 2025 8 28 22 246.256424  18.345520
 Obj: 2025 8 28 22 249.295817  60.150303
  • the object visibility at Siding Spring Obs., Australia 
     
Tokyo, Japan
      TimeUT       Azimuth     Elevation
 Sun: 2025 8 28 22 268.734778  14.854090
 Obj: 2025 8 28 22 312.342660  22.233272
  • the object visibility at Tokyo, Japan 
     
William Herschel Telescope, La Palma, Canary Islands, Spain
      TimeUT       Azimuth     Elevation
 Sun: 2025 8 28 22 121.640796  -29.587398
 Obj: 2025 8 28 22 123.793482  -71.395824
  • the object visibility at William Hershel Telescope, La Palma, Canary Islands, Spain 
     
Gemini South, Cerro Pachon, Chile
      TimeUT       Azimuth     Elevation
 Sun: 2025 8 28 22 104.058620  5.188487
 Obj: 2025 8 28 22 64.272837  -8.088592
  • the object visibility at Gemini South, Cerro Pachon, Chile 
     
 
 
The data/results are in /local/data/bat1/prebascript/trigger1345836/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:
Thu Aug 28 18:52:23 EDT 2025