TDRSS lightcurve for Trigger=1328546

Notes:

GCN BAT Position Notice

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 28 Jun 25 00:56:32 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     1328546,   Seg_Num: 0
GRB_RA:           38.551d {+02h 34m 12s} (J2000),
                  38.809d {+02h 35m 14s} (current),
                  38.047d {+02h 32m 11s} (1950)
GRB_DEC:         -38.081d {-38d 04' 50"} (J2000),
                 -37.970d {-37d 58' 11"} (current),
                 -38.299d {-38d 17' 56"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       5362 [cnts]    Image_Peak=219 [image_cnts]
TRIGGER_DUR:     2.048 [sec] 
TRIGGER_INDEX:   256     E_range: 15-50 keV
BKG_INTEN:       51358 [cnts]
BKG_TIME:        3324.13 SOD {00:55:24.13} UT
BKG_DUR:         24 [sec]
GRB_DATE:        20854 TJD;   179 DOY;   25/06/28
GRB_TIME:        3356.71 SOD {00:55:56.71} UT
GRB_PHI:          14.67 [deg]
GRB_THETA:        37.56 [deg]
SOLN_STATUS:     0x3
RATE_SIGNIF:     12.36 [sigma]
IMAGE_SIGNIF:    9.16 [sigma]
MERIT_PARAMS:     +1  +0  +0  +1  +1  +0  +0  +0 -13  +0 
SUN_POSTN:        97.20d {+06h 28m 48s}  +23.27d {+23d 16' 13"}
SUN_DIST:         82.15 [deg]   Sun_angle= 3.9 [hr] (West of Sun)
MOON_POSTN:      134.24d {+08h 56m 58s}  +20.63d {+20d 37' 57"}
MOON_DIST:       106.66 [deg]
MOON_ILLUM:      9 [%]
GAL_COORDS:      246.39,-65.86 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       18.40,-49.55 [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 = 124.13,20.36 [deg].

GCN BAT Lightcurve Notice

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 28 Jun 25 01:15:02 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     1328546,   Seg_Num: 0
GRB_RA:           38.551d {+02h 34m 12s} (J2000),
                  38.809d {+02h 35m 14s} (current),
                  38.047d {+02h 32m 11s} (1950)
GRB_DEC:         -38.081d {-38d 04' 50"} (J2000),
                 -37.970d {-37d 58' 11"} (current),
                 -38.299d {-38d 17' 56"} (1950)
GRB_DATE:        20854 TJD;   179 DOY;   25/06/28
GRB_TIME:        3356.71 SOD {00:55:56.71} UT
TRIGGER_INDEX:   256
GRB_PHI:          14.67 [deg]
GRB_THETA:        37.56 [deg]
DELTA_TIME:      -56.00 [sec]
TRIGGER_DUR:     2.048 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     12.36 [sigma]
IMAGE_SIGNIF:    9.16 [sigma]
LC_URL:          sw01328546000msb.lc

GCN template for BAT paragraph

  • Click here! 
    At 00:55:56 UT, the Swift Burst Alert Telescope (BAT) triggered and
located GRB 250628 ***A*** (trigger=1328546).  Swift slewed immediately to the burst.
The BAT on-board calculated location is 
RA, Dec 38.551, -38.081 which is 
   RA(J2000) = 02h 34m 12s
   Dec(J2000) = -38d 04' 50"
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 ~1066 counts/sec (15-350 keV), at ~1 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

    Extended TDRSS lc No.5

    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: 58.112 s +/- 2.90513 s
  Estimated T50 duration: 42.368 s +/- 2.89772 s
  Estimated Peak Interval: MET   772765032.51199996 +/- 0.500000 s
  Estimated background rate 1:     3593.819 near MET 772764975.200000 s
  Estimated background rate 2:     3551.742 near MET 772765114.432000 s
  Estimated total duration: 68.544 s (for data selection)
       (from MET 772764982.400000 to MET 772765050.944000)
  Estimated total fluence: 12230.331345 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 38.551 -38.081 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 38.551 -38.081
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 6 28 19 63.125164  62.347587
 Obj: 2025 6 28 19 56.867958  -20.145671
  • the object visibility at GSFC, Greenbelt, Maryland 
     
MMT Observatory, Mt. Hopkins, Arizona
      TimeUT       Azimuth     Elevation
 Sun: 2025 6 28 19 321.008693  79.391692
 Obj: 2025 6 28 19 38.554391  5.148870
  • the object visibility at MMT, Mt. Hopkins, Arizona 
     
Hale Telescope, Palomar Mountain, California
      TimeUT       Azimuth     Elevation
 Sun: 2025 6 28 19 307.655729  74.597296
 Obj: 2025 6 28 19 34.802995  6.828114
  • the object visibility at Hale Telescope, Palomar Mt., California 
     
Mauna Kea, Hawaii
      TimeUT       Azimuth     Elevation
 Sun: 2025 6 28 19 256.119227  41.898237
 Obj: 2025 6 28 19 6.820002  31.750882
  • the object visibility at Mauna Kea, Hawaii 
     
Siding Spring Obs., Australia
      TimeUT       Azimuth     Elevation
 Sun: 2025 6 28 19 257.441649  -26.026863
 Obj: 2025 6 28 19 293.274607  50.271223
  • the object visibility at Siding Spring Obs., Australia 
     
Tokyo, Japan
      TimeUT       Azimuth     Elevation
 Sun: 2025 6 28 19 231.107515  -11.568017
 Obj: 2025 6 28 19 314.387883  -4.046167
  • the object visibility at Tokyo, Japan 
     
William Herschel Telescope, La Palma, Canary Islands, Spain
      TimeUT       Azimuth     Elevation
 Sun: 2025 6 28 19 108.876268  14.403705
 Obj: 2025 6 28 19 63.175718  -59.524753
  • the object visibility at William Hershel Telescope, La Palma, Canary Islands, Spain 
     
Gemini South, Cerro Pachon, Chile
      TimeUT       Azimuth     Elevation
 Sun: 2025 6 28 19 145.858582  27.892576
 Obj: 2025 6 28 19 55.388028  16.757044
  • the object visibility at Gemini South, Cerro Pachon, Chile 
     
 
 
The data/results are in /local/data/bat1/prebascript/trigger1328546/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 Jun 28 15:31:23 EDT 2025