TDRSS lightcurve for Trigger=1400964

Notes:

GCN BAT Position Notice

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 03 Oct 25 01:58:50 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     1400964,   Seg_Num: 0
GRB_RA:           18.503d {+01h 14m 01s} (J2000),
                  18.903d {+01h 15m 37s} (current),
                  17.733d {+01h 10m 56s} (1950)
GRB_DEC:         +56.507d {+56d 30' 23"} (J2000),
                 +56.642d {+56d 38' 32"} (current),
                 +56.242d {+56d 14' 31"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       3195 [cnts]    Image_Peak=183 [image_cnts]
TRIGGER_DUR:     1.024 [sec] 
TRIGGER_INDEX:   146     E_range: 25-100 keV
BKG_INTEN:       18704 [cnts]
BKG_TIME:        7091.56 SOD {01:58:11.56} UT
BKG_DUR:         8 [sec]
GRB_DATE:        20951 TJD;   276 DOY;   25/10/03
GRB_TIME:        7110.06 SOD {01:58:30.06} UT
GRB_PHI:          50.17 [deg]
GRB_THETA:         9.66 [deg]
SOLN_STATUS:     0x20000003
RATE_SIGNIF:     15.45 [sigma]
IMAGE_SIGNIF:    8.18 [sigma]
MERIT_PARAMS:     +1  +0  +0  +0  +2  -1  +0  +1 +60  +0 
SUN_POSTN:       189.30d {+12h 37m 12s}   -4.01d {-04d 00' 25"}
SUN_DIST:        126.81 [deg]   Sun_angle= 11.4 [hr] (West of Sun)
MOON_POSTN:      319.61d {+21h 18m 26s}  -18.57d {-18d 34' 05"}
MOON_DIST:        89.99 [deg]
MOON_ILLUM:      79 [%]
GAL_COORDS:      126.06, -6.23 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       43.26, 44.06 [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 = 356.67,18.82 [deg].  
COMMENTS:           
COMMENTS:        NOTE: This BAT event is temporally(1.0<100sec) coincident with the FERMI_GBM event (trignum=781149516).

GCN BAT Lightcurve Notice

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 03 Oct 25 02:15:57 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     1400964,   Seg_Num: 0
GRB_RA:           18.503d {+01h 14m 01s} (J2000),
                  18.903d {+01h 15m 37s} (current),
                  17.733d {+01h 10m 56s} (1950)
GRB_DEC:         +56.507d {+56d 30' 23"} (J2000),
                 +56.642d {+56d 38' 32"} (current),
                 +56.242d {+56d 14' 31"} (1950)
GRB_DATE:        20951 TJD;   276 DOY;   25/10/03
GRB_TIME:        7110.06 SOD {01:58:30.06} UT
TRIGGER_INDEX:   146
GRB_PHI:          50.17 [deg]
GRB_THETA:         9.66 [deg]
DELTA_TIME:      71.00 [sec]
TRIGGER_DUR:     1.024 [sec] 
SOLN_STATUS:     0x2003
RATE_SIGNIF:     15.45 [sigma]
IMAGE_SIGNIF:    8.18 [sigma]
LC_URL:          sw01400964000msb.lc

GCN template for BAT paragraph

  • Click here! 
    At 01:58:30 UT, the Swift Burst Alert Telescope (BAT) triggered and
located GRB 251003 ***A*** (trigger=1400964).  Swift slewed immediately to the burst.
The BAT on-board calculated location is 
RA, Dec 18.503, +56.507 which is 
   RA(J2000) = 01h 14m 01s
   Dec(J2000) = +56d 30' 23"
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 ~1835 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: 8.064 s +/- 0.256 s
  Estimated T50 duration: 3.2 s +/- 0.128 s
  Estimated Peak Interval: MET   781149546.81599998 +/- 0.500000 s
  Estimated background rate 1:     4445.865 near MET 781149533.600000 s
  Estimated background rate 2:     4323.389 near MET 781149661.440000 s
  Estimated total duration: 45.76 s (for data selection)
       (from MET 781149544.000000 to MET 781149589.760000)
  Estimated total fluence: 6526.355168 count
  Created GTI with 6 entries
------------------------------------------

    Search for this GRB position to the previously BAT detected GRB positions (search radius within 5 arcmin)

    bat_grb_pos_cat.sh 18.503 56.507 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 18.503 56.507
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 10 3 2 119.232260  -36.581661
 Obj: 2025 10 3 2 224.957883  50.815118
  • the object visibility at GSFC, Greenbelt, Maryland 
     
MMT Observatory, Mt. Hopkins, Arizona
      TimeUT       Azimuth     Elevation
 Sun: 2025 10 3 2 92.553534  -11.798261
 Obj: 2025 10 3 2 218.061337  26.908210
  • the object visibility at MMT, Mt. Hopkins, Arizona 
     
Hale Telescope, Palomar Mountain, California
      TimeUT       Azimuth     Elevation
 Sun: 2025 10 3 2 89.589728  -6.723434
 Obj: 2025 10 3 2 217.294183  25.140529
  • the object visibility at Hale Telescope, Palomar Mt., California 
     
Mauna Kea, Hawaii
      TimeUT       Azimuth     Elevation
 Sun: 2025 10 3 2 73.239304  29.340592
 Obj: 2025 10 3 2 203.841348  -3.946768
  • the object visibility at Mauna Kea, Hawaii 
     
Siding Spring Obs., Australia
      TimeUT       Azimuth     Elevation
 Sun: 2025 10 3 2 177.164236  62.681285
 Obj: 2025 10 3 2 169.577351  -64.009623
  • the object visibility at Siding Spring Obs., Australia 
     
Tokyo, Japan
      TimeUT       Azimuth     Elevation
 Sun: 2025 10 3 2 336.341757  48.941051
 Obj: 2025 10 3 2 166.583305  3.429974
  • the object visibility at Tokyo, Japan 
     
William Herschel Telescope, La Palma, Canary Islands, Spain
      TimeUT       Azimuth     Elevation
 Sun: 2025 10 3 2 211.500814  -61.769590
 Obj: 2025 10 3 2 174.444763  61.890238
  • the object visibility at William Hershel Telescope, La Palma, Canary Islands, Spain 
     
Gemini South, Cerro Pachon, Chile
      TimeUT       Azimuth     Elevation
 Sun: 2025 10 3 2 54.016515  -39.533206
 Obj: 2025 10 3 2 204.404482  -6.146741
  • the object visibility at Gemini South, Cerro Pachon, Chile 
     
 
 
The data/results are in /local/data/bat1/prebascript/trigger1400964/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 Oct  2 22:16:43 EDT 2025