TDRSS lightcurve for Trigger=1285677

Notes:

GCN BAT Position Notice

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 28 Jan 25 16:23:07 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     1285677,   Seg_Num: 0
GRB_RA:          231.420d {+15h 25m 41s} (J2000),
                 231.742d {+15h 26m 58s} (current),
                 230.778d {+15h 23m 07s} (1950)
GRB_DEC:          -0.517d {-00d 31' 01"} (J2000),
                  -0.604d {-00d 36' 13"} (current),
                  -0.342d {-00d 20' 31"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       438 [cnts]    Image_Peak=58 [image_cnts]
TRIGGER_DUR:     0.064 [sec] 
TRIGGER_INDEX:   10418     E_range: 25-100 keV
BKG_INTEN:       16604 [cnts]
BKG_TIME:        58957.02 SOD {16:22:37.02} UT
BKG_DUR:         8 [sec]
GRB_DATE:        20703 TJD;    28 DOY;   25/01/28
GRB_TIME:        58973.66 SOD {16:22:53.66} UT
GRB_PHI:         -15.64 [deg]
GRB_THETA:        18.21 [deg]
SOLN_STATUS:     0x20000003
RATE_SIGNIF:     24.75 [sigma]
IMAGE_SIGNIF:    7.64 [sigma]
MERIT_PARAMS:     +1  +0  +0  -4  +2  -2  +0  +0 -16  +0 
SUN_POSTN:       311.44d {+20h 45m 45s}  -18.00d {-18d 00' 09"}
SUN_DIST:         80.02 [deg]   Sun_angle= 5.3 [hr] (West of Sun)
MOON_POSTN:      301.27d {+20h 05m 04s}  -24.90d {-24d 53' 51"}
MOON_DIST:        71.23 [deg]
MOON_ILLUM:      1 [%]
GAL_COORDS:        2.61, 43.77 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      229.14, 17.62 [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 = 174.89,-5.45 [deg].  
COMMENTS:           
COMMENTS:        NOTE: This BAT event is temporally(0.0<100sec) coincident with the FERMI_GBM event (trignum=759774178).

GCN BAT Lightcurve Notice

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 28 Jan 25 16:43:51 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     1285677,   Seg_Num: 0
GRB_RA:          231.420d {+15h 25m 41s} (J2000),
                 231.742d {+15h 26m 58s} (current),
                 230.778d {+15h 23m 07s} (1950)
GRB_DEC:          -0.517d {-00d 31' 01"} (J2000),
                  -0.604d {-00d 36' 13"} (current),
                  -0.342d {-00d 20' 31"} (1950)
GRB_DATE:        20703 TJD;    28 DOY;   25/01/28
GRB_TIME:        58973.71 SOD {16:22:53.71} UT
TRIGGER_INDEX:   10418
GRB_PHI:         -15.64 [deg]
GRB_THETA:        18.21 [deg]
DELTA_TIME:      -68.00 [sec]
TRIGGER_DUR:     0.064 [sec] 
SOLN_STATUS:     0x3
RATE_SIGNIF:     24.75 [sigma]
IMAGE_SIGNIF:    7.64 [sigma]
LC_URL:          sw01285677000msb.lc

GCN template for BAT paragraph

  • Click here! 
    At 16:22:53 UT, the Swift Burst Alert Telescope (BAT) triggered and
located GRB 250128 ***A*** (trigger=1285677).  Swift slewed immediately to the burst.
The BAT on-board calculated location is 
RA, Dec 231.420, -0.517 which is 
   RA(J2000) = 15h 25m 41s
   Dec(J2000) = -00d 31' 01"
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 ~5578 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: 123.776 s +/- 2.89772 s
  Estimated T50 duration: 57.344 s +/- 4.096 s
  Estimated Peak Interval: MET   759774209.02399993 +/- 0.500000 s
  Estimated background rate 1:     4123.219 near MET 759774196.352000 s
  Estimated background rate 2:     4203.421 near MET 759774365.248000 s
  Estimated total duration: 127.872 s (for data selection)
       (from MET 759774208.704000 to MET 759774336.576000)
  Estimated total fluence: 7991.981199 count
  Created GTI with 7 entries
------------------------------------------

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

    bat_grb_pos_cat.sh 231.420 -0.517 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 231.420 -0.517
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 1 28 16 337.282220  29.769671
 Obj: 2025 1 28 16 68.845593  23.107951
  • the object visibility at GSFC, Greenbelt, Maryland 
     
MMT Observatory, Mt. Hopkins, Arizona
      TimeUT       Azimuth     Elevation
 Sun: 2025 1 28 16 305.456115  17.780743
 Obj: 2025 1 28 16 41.131526  49.911716
  • the object visibility at MMT, Mt. Hopkins, Arizona 
     
Hale Telescope, Palomar Mountain, California
      TimeUT       Azimuth     Elevation
 Sun: 2025 1 28 16 301.852347  12.657643
 Obj: 2025 1 28 16 31.723626  51.571949
  • the object visibility at Hale Telescope, Palomar Mt., California 
     
Mauna Kea, Hawaii
      TimeUT       Azimuth     Elevation
 Sun: 2025 1 28 16 284.295747  -14.407363
 Obj: 2025 1 28 16 314.598869  61.978086
  • the object visibility at Mauna Kea, Hawaii 
     
Siding Spring Obs., Australia
      TimeUT       Azimuth     Elevation
 Sun: 2025 1 28 16 330.222048  -35.063514
 Obj: 2025 1 28 16 262.602747  13.064063
  • the object visibility at Siding Spring Obs., Australia 
     
Tokyo, Japan
      TimeUT       Azimuth     Elevation
 Sun: 2025 1 28 16 207.527294  -71.878079
 Obj: 2025 1 28 16 269.584777  -1.711352
  • the object visibility at Tokyo, Japan 
     
William Herschel Telescope, La Palma, Canary Islands, Spain
      TimeUT       Azimuth     Elevation
 Sun: 2025 1 28 16 43.145091  30.296119
 Obj: 2025 1 28 16 103.811799  -24.698104
  • the object visibility at William Hershel Telescope, La Palma, Canary Islands, Spain 
     
Gemini South, Cerro Pachon, Chile
      TimeUT       Azimuth     Elevation
 Sun: 2025 1 28 16 230.746621  71.788333
 Obj: 2025 1 28 16 102.735749  21.726968
  • the object visibility at Gemini South, Cerro Pachon, Chile 
     
 
 
The data/results are in /local/data/bat1/prebascript/trigger1285677/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:
Tue Jan 28 11:44:02 EST 2025