TDRSS lightcurve for Trigger=1442056

Notes:

GCN BAT Position Notice

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 18 Jan 26 11:29:09 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     1442056,   Seg_Num: 0
GRB_RA:          170.230d {+11h 20m 55s} (J2000),
                 170.518d {+11h 22m 04s} (current),
                 169.680d {+11h 18m 43s} (1950)
GRB_DEC:         -61.909d {-61d 54' 32"} (J2000),
                 -62.052d {-62d 03' 07"} (current),
                 -61.635d {-61d 38' 06"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       0 [cnts]    Image_Peak=7734 [image_cnts]
TRIGGER_DUR:     64.000 [sec] 
TRIGGER_INDEX:   20000     E_range: 15-50 keV
BKG_INTEN:       0 [cnts]
BKG_TIME:        0.00 SOD {00:00:00.00} UT
BKG_DUR:         0 [sec]
GRB_DATE:        21058 TJD;    18 DOY;   26/01/18
GRB_TIME:        41274.93 SOD {11:27:54.93} UT
GRB_PHI:          17.49 [deg]
GRB_THETA:         1.37 [deg]
SOLN_STATUS:     0x1000011D
RATE_SIGNIF:     0.00 [sigma]
IMAGE_SIGNIF:    21.94 [sigma]
MERIT_PARAMS:     +0  +0 +123  +6  +1  +7  +0  +1  -2  +0 
SUN_POSTN:       300.49d {+20h 01m 57s}  -20.48d {-20d 28' 55"}
SUN_DIST:         88.45 [deg]   Sun_angle= 8.7 [hr] (West of Sun)
MOON_POSTN:      297.05d {+19h 48m 13s}  -24.89d {-24d 53' 19"}
MOON_DIST:        83.18 [deg]
MOON_ILLUM:      0 [%]
GAL_COORDS:      292.49, -0.89 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      210.89,-57.27 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT-BAT GRB Coordinates.  
COMMENTS:        This is an image trigger.  (The RATE_SIGNIF & BKG_{INTEN, TIME, DUR} are undefined.)  
COMMENTS:        A point_source was found.  
COMMENTS:        This matches a source in the on-board catalog: Num=10689=1A1118-61,   delta=0.009 [deg].  
COMMENTS:        This matches a source in the ground catalog: 1A1118-61,   delta=0.009 [deg].  
COMMENTS:        This is not a GRB.  
COMMENTS:        This is an interesting source.  
COMMENTS:        This trigger occurred at longitude,latitude = 191.90,-16.85 [deg].  
COMMENTS:

GCN BAT Lightcurve Notice

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sun 18 Jan 26 11:46:41 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     1442056,   Seg_Num: 0
GRB_RA:          170.230d {+11h 20m 55s} (J2000),
                 170.518d {+11h 22m 04s} (current),
                 169.680d {+11h 18m 43s} (1950)
GRB_DEC:         -61.909d {-61d 54' 32"} (J2000),
                 -62.052d {-62d 03' 07"} (current),
                 -61.635d {-61d 38' 06"} (1950)
GRB_DATE:        21058 TJD;    18 DOY;   26/01/18
GRB_TIME:        41274.93 SOD {11:27:54.93} UT
TRIGGER_INDEX:   20000
GRB_PHI:          17.49 [deg]
GRB_THETA:         1.37 [deg]
DELTA_TIME:      0.00 [sec]
TRIGGER_DUR:     64.000 [sec] 
SOLN_STATUS:     0x11D
RATE_SIGNIF:     0.00 [sigma]
IMAGE_SIGNIF:    21.94 [sigma]
LC_URL:          sw01442056000msb.lc

GCN template for BAT paragraph

  • Click here! 
    At 11:27:54 UT, the Swift Burst Alert Telescope (BAT) triggered and
located GRB 260118 ***A*** (trigger=1442056).  Swift slewed immediately to the burst.
The BAT on-board calculated location is 
RA, Dec 170.230, -61.909 which is 
   RA(J2000) = 11h 20m 55s
   Dec(J2000) = -61d 54' 32"
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 ~921 counts/sec (15-350 keV), at ~3 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: 100.096 s +/- 28.705 s
  Estimated T50 duration: 22.272 s +/- 0.746362 s
  Estimated Peak Interval: MET   790428552.51199996 +/- 0.500000 s
  Estimated background rate 1:     4106.876 near MET 790428502.208000 s
  Estimated background rate 2:     3798.431 near MET 790428681.536000 s
  Estimated total duration: 148.736 s (for data selection)
       (from MET 790428516.416000 to MET 790428665.152000)
  Estimated total fluence: 9927.355878 count
  Created GTI with 5 entries
------------------------------------------

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

    bat_grb_pos_cat.sh 170.230 -61.909 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 170.230 -61.909
1A 1118-61 33719 170.238 -61.917 0.008843258242493171

    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: 2026 1 18 11 283.316729  -16.507881
 Obj: 2026 1 18 11 16.142092  -14.958614
  • the object visibility at GSFC, Greenbelt, Maryland 
     
MMT Observatory, Mt. Hopkins, Arizona
      TimeUT       Azimuth     Elevation
 Sun: 2026 1 18 11 269.087543  -43.287742
 Obj: 2026 1 18 11 0.457373  -3.778047
  • the object visibility at MMT, Mt. Hopkins, Arizona 
     
Hale Telescope, Palomar Mountain, California
      TimeUT       Azimuth     Elevation
 Sun: 2026 1 18 11 263.843301  -48.219257
 Obj: 2026 1 18 11 357.643689  -5.527466
  • the object visibility at Hale Telescope, Palomar Mt., California 
     
Mauna Kea, Hawaii
      TimeUT       Azimuth     Elevation
 Sun: 2026 1 18 11 277.327043  -83.928190
 Obj: 2026 1 18 11 341.136047  1.078810
  • the object visibility at Mauna Kea, Hawaii 
     
Siding Spring Obs., Australia
      TimeUT       Azimuth     Elevation
 Sun: 2026 1 18 11 48.848118  -20.095112
 Obj: 2026 1 18 11 329.741479  23.267862
  • the object visibility at Siding Spring Obs., Australia 
     
Tokyo, Japan
      TimeUT       Azimuth     Elevation
 Sun: 2026 1 18 11 85.267747  -31.128528
 Obj: 2026 1 18 11 325.480470  -41.845104
  • the object visibility at Tokyo, Japan 
     
William Herschel Telescope, La Palma, Canary Islands, Spain
      TimeUT       Azimuth     Elevation
 Sun: 2026 1 18 11 320.665355  29.711535
 Obj: 2026 1 18 11 31.638713  -26.994938
  • the object visibility at William Hershel Telescope, La Palma, Canary Islands, Spain 
     
Gemini South, Cerro Pachon, Chile
      TimeUT       Azimuth     Elevation
 Sun: 2026 1 18 11 287.460348  10.904420
 Obj: 2026 1 18 11 27.729988  48.742522
  • the object visibility at Gemini South, Cerro Pachon, Chile 
     
 
 
The data/results are in /local/data/bat1/prebascript/trigger1442056/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:
Sun Jan 18 06:47:23 EST 2026