TDRSS lightcurve for Trigger=1299965

Notes:

GCN BAT Position Notice

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 31 Mar 25 04:20:35 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     1299965,   Seg_Num: 0
GRB_RA:           71.381d {+04h 45m 31s} (J2000),
                  71.832d {+04h 47m 20s} (current),
                  70.488d {+04h 41m 57s} (1950)
GRB_DEC:         +43.805d {+43d 48' 17"} (J2000),
                 +43.849d {+43d 50' 57"} (current),
                 +43.714d {+43d 42' 50"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       9790 [cnts]    Image_Peak=253 [image_cnts]
TRIGGER_DUR:     4.096 [sec] 
TRIGGER_INDEX:   448     E_range: 15-50 keV
BKG_INTEN:       87148 [cnts]
BKG_TIME:        15524.65 SOD {04:18:44.65} UT
BKG_DUR:         40 [sec]
GRB_DATE:        20765 TJD;    90 DOY;   25/03/31
GRB_TIME:        15583.47 SOD {04:19:43.47} UT
GRB_PHI:         -179.81 [deg]
GRB_THETA:        39.82 [deg]
SOLN_STATUS:     0x3
RATE_SIGNIF:     9.21 [sigma]
IMAGE_SIGNIF:    7.17 [sigma]
MERIT_PARAMS:     +1  +0  +0  +2  +1  -3  +0  +1 -39  +0 
SUN_POSTN:         9.85d {+00h 39m 24s}   +4.24d {+04d 14' 22"}
SUN_DIST:         67.11 [deg]   Sun_angle= -4.1 [hr] (East of Sun)
MOON_POSTN:       31.78d {+02h 07m 06s}  +16.20d {+16d 12' 06"}
MOON_DIST:        43.67 [deg]
MOON_ILLUM:      5 [%]
GAL_COORDS:      160.93, -1.13 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       75.68, 21.29 [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 = 67.82,17.39 [deg].

GCN BAT Lightcurve Notice

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 31 Mar 25 04:39:53 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     1299965,   Seg_Num: 0
GRB_RA:           71.381d {+04h 45m 31s} (J2000),
                  71.832d {+04h 47m 20s} (current),
                  70.488d {+04h 41m 57s} (1950)
GRB_DEC:         +43.805d {+43d 48' 17"} (J2000),
                 +43.849d {+43d 50' 57"} (current),
                 +43.714d {+43d 42' 50"} (1950)
GRB_DATE:        20765 TJD;    90 DOY;   25/03/31
GRB_TIME:        15583.47 SOD {04:19:43.47} UT
TRIGGER_INDEX:   448
GRB_PHI:         -179.81 [deg]
GRB_THETA:        39.82 [deg]
DELTA_TIME:      1677.00 [sec]
TRIGGER_DUR:     4.096 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     9.21 [sigma]
IMAGE_SIGNIF:    7.17 [sigma]
LC_URL:          sw01299965000msb.lc

GCN template for BAT paragraph

  • Click here! 
    At 04:19:43 UT, the Swift Burst Alert Telescope (BAT) triggered and
located GRB 250331 ***A*** (trigger=1299965).  Swift slewed immediately to the burst.
The BAT on-board calculated location is 
RA, Dec 71.381, +43.805 which is 
   RA(J2000) = 04h 45m 31s
   Dec(J2000) = +43d 48' 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 ~1468 counts/sec (15-350 keV), at ~2 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: 2.944 s +/- 0.256 s
  Estimated T50 duration: 1.28 s +/- 0.256 s
  Estimated Peak Interval: MET   765087620.73600006 +/- 0.500000 s
  Estimated background rate 1:     3739.950 near MET 765087607.488000 s
  Estimated background rate 2:     3763.557 near MET 765087713.984000 s
  Estimated total duration: 3.072 s (for data selection)
       (from MET 765087619.776000 to MET 765087622.848000)
  Estimated total fluence: 1021.310015 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 71.381 43.805 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 71.381 43.805
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 3 31 4 154.226443  -43.555684
 Obj: 2025 3 31 4 130.802515  20.010734
  • the object visibility at GSFC, Greenbelt, Maryland 
     
MMT Observatory, Mt. Hopkins, Arizona
      TimeUT       Azimuth     Elevation
 Sun: 2025 3 31 4 115.811775  -28.627289
 Obj: 2025 3 31 4 123.394276  38.113484
  • the object visibility at MMT, Mt. Hopkins, Arizona 
     
Hale Telescope, Palomar Mountain, California
      TimeUT       Azimuth     Elevation
 Sun: 2025 3 31 4 112.330993  -23.343536
 Obj: 2025 3 31 4 121.288099  43.269008
  • the object visibility at Hale Telescope, Palomar Mt., California 
     
Mauna Kea, Hawaii
      TimeUT       Azimuth     Elevation
 Sun: 2025 3 31 4 91.633157  7.988195
 Obj: 2025 3 31 4 148.595286  60.256804
  • the object visibility at Mauna Kea, Hawaii 
     
Siding Spring Obs., Australia
      TimeUT       Azimuth     Elevation
 Sun: 2025 3 31 4 138.586511  45.816164
 Obj: 2025 3 31 4 204.377825  8.492811
  • the object visibility at Siding Spring Obs., Australia 
     
Tokyo, Japan
      TimeUT       Azimuth     Elevation
 Sun: 2025 3 31 4 20.968211  58.162974
 Obj: 2025 3 31 4 240.641890  49.897474
  • the object visibility at Tokyo, Japan 
     
William Herschel Telescope, La Palma, Canary Islands, Spain
      TimeUT       Azimuth     Elevation
 Sun: 2025 3 31 4 236.507625  -38.972318
 Obj: 2025 3 31 4 164.191070  -14.828065
  • the object visibility at William Hershel Telescope, La Palma, Canary Islands, Spain 
     
Gemini South, Cerro Pachon, Chile
      TimeUT       Azimuth     Elevation
 Sun: 2025 3 31 4 26.818841  -61.366091
 Obj: 2025 3 31 4 125.770165  -31.095222
  • the object visibility at Gemini South, Cerro Pachon, Chile 
     
 
 
The data/results are in /local/data/bat1/prebascript/trigger1299965/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:
Mon Mar 31 00:16:02 EDT 2025