TDRSS lightcurve for Trigger=1297508

Notes:

GCN BAT Position Notice

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 21 Mar 25 00:43:00 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     1297508,   Seg_Num: 0
GRB_RA:          295.077d {+19h 40m 19s} (J2000),
                 295.351d {+19h 41m 24s} (current),
                 294.534d {+19h 38m 08s} (1950)
GRB_DEC:         +21.041d {+21d 02' 27"} (J2000),
                 +21.101d {+21d 06' 03"} (current),
                 +20.924d {+20d 55' 27"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       3021 [cnts]    Image_Peak=183 [image_cnts]
TRIGGER_DUR:     1.024 [sec] 
TRIGGER_INDEX:   149     E_range: 25-100 keV
BKG_INTEN:       15975 [cnts]
BKG_TIME:        2540.71 SOD {00:42:20.71} UT
BKG_DUR:         8 [sec]
GRB_DATE:        20755 TJD;    80 DOY;   25/03/21
GRB_TIME:        2558.89 SOD {00:42:38.89} UT
GRB_PHI:          21.93 [deg]
GRB_THETA:        44.31 [deg]
SOLN_STATUS:     0x20000003
RATE_SIGNIF:     21.97 [sigma]
IMAGE_SIGNIF:    10.33 [sigma]
MERIT_PARAMS:     +1  +0  +0  +0  +2  +0  +0  +1 -38  +0 
SUN_POSTN:         0.60d {+00h 02m 25s}   +0.26d {+00d 15' 42"}
SUN_DIST:         66.91 [deg]   Sun_angle= 4.4 [hr] (West of Sun)
MOON_POSTN:      252.04d {+16h 48m 10s}  -27.65d {-27d 39' 10"}
MOON_DIST:        64.26 [deg]
MOON_ILLUM:      64 [%]
GAL_COORDS:       57.11, -0.69 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      302.01, 41.73 [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 = 169.98,7.43 [deg].  
COMMENTS:           
COMMENTS:        NOTE: This BAT event is temporally(1.0<100sec) coincident with the FERMI_GBM event (trignum=764210564).

GCN BAT Lightcurve Notice

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Fri 21 Mar 25 00:48:00 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     1297508,   Seg_Num: 0
GRB_RA:          295.077d {+19h 40m 19s} (J2000),
                 295.351d {+19h 41m 24s} (current),
                 294.534d {+19h 38m 08s} (1950)
GRB_DEC:         +21.041d {+21d 02' 27"} (J2000),
                 +21.101d {+21d 06' 03"} (current),
                 +20.924d {+20d 55' 27"} (1950)
GRB_DATE:        20755 TJD;    80 DOY;   25/03/21
GRB_TIME:        2558.89 SOD {00:42:38.89} UT
TRIGGER_INDEX:   149
GRB_PHI:          21.93 [deg]
GRB_THETA:        44.31 [deg]
DELTA_TIME:      0.00 [sec]
TRIGGER_DUR:     1.024 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     21.97 [sigma]
IMAGE_SIGNIF:    10.33 [sigma]
LC_URL:          sw01297508000msb.lc

GCN template for BAT paragraph

  • Click here! 
    At 00:42:38 UT, the Swift Burst Alert Telescope (BAT) triggered and
located GRB 250321 ***A*** (trigger=1297508).  Swift slewed immediately to the burst.
The BAT on-board calculated location is 
RA, Dec 295.077, +21.041 which is 
   RA(J2000) = 19h 40m 19s
   Dec(J2000) = +21d 02' 27"
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 ~2523 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

    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: 2.56 s +/- 0.128 s
  Estimated T50 duration: 1.536 s +/- 0.128 s
  Estimated Peak Interval: MET   764210594.62400007 +/- 0.500000 s
  Estimated background rate 1:     3840.576 near MET 764210581.888000 s
  Estimated background rate 2:     3971.571 near MET 764210599.296000 s
  Estimated total duration: 2.816 s (for data selection)
       (from MET 764210594.176000 to MET 764210596.992000)
  Estimated total fluence: 2327.510738 count
  Created GTI with 4 entries
------------------------------------------

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

    bat_grb_pos_cat.sh 295.077 21.041 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 295.077 21.041
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 21 0 97.048223  -8.253886
 Obj: 2025 3 21 0 165.160248  -28.522118
  • the object visibility at GSFC, Greenbelt, Maryland 
     
MMT Observatory, Mt. Hopkins, Arizona
      TimeUT       Azimuth     Elevation
 Sun: 2025 3 21 0 77.540195  19.686150
 Obj: 2025 3 21 0 132.480471  -20.063441
  • the object visibility at MMT, Mt. Hopkins, Arizona 
     
Hale Telescope, Palomar Mountain, California
      TimeUT       Azimuth     Elevation
 Sun: 2025 3 21 0 73.156804  24.147951
 Obj: 2025 3 21 0 128.623009  -15.148214
  • the object visibility at Hale Telescope, Palomar Mt., California 
     
Mauna Kea, Hawaii
      TimeUT       Azimuth     Elevation
 Sun: 2025 3 21 0 50.665739  60.706769
 Obj: 2025 3 21 0 109.201380  9.236671
  • the object visibility at Mauna Kea, Hawaii 
     
Siding Spring Obs., Australia
      TimeUT       Azimuth     Elevation
 Sun: 2025 3 21 0 231.368092  45.407951
 Obj: 2025 3 21 0 145.481023  29.260357
  • the object visibility at Siding Spring Obs., Australia 
     
Tokyo, Japan
      TimeUT       Azimuth     Elevation
 Sun: 2025 3 21 0 295.253574  32.272105
 Obj: 2025 3 21 0 49.497355  71.008452
  • the object visibility at Tokyo, Japan 
     
William Herschel Telescope, La Palma, Canary Islands, Spain
      TimeUT       Azimuth     Elevation
 Sun: 2025 3 21 0 142.835801  -55.174478
 Obj: 2025 3 21 0 226.213452  -23.911732
  • the object visibility at William Hershel Telescope, La Palma, Canary Islands, Spain 
     
Gemini South, Cerro Pachon, Chile
      TimeUT       Azimuth     Elevation
 Sun: 2025 3 21 0 81.602540  -14.533682
 Obj: 2025 3 21 0 40.017550  -78.266905
  • the object visibility at Gemini South, Cerro Pachon, Chile 
     
 
 
The data/results are in /local/data/bat1/prebascript/trigger1297508/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 Mar 20 20:30:33 EDT 2025