TDRSS lightcurve for Trigger=1062273

Notes:

GCN BAT Position Notice

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 31 Jul 21 14:46:48 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     1062273,   Seg_Num: 0
GRB_RA:          255.992d {+17h 03m 58s} (J2000),
                 256.360d {+17h 05m 26s} (current),
                 255.143d {+17h 00m 34s} (1950)
GRB_DEC:         -37.851d {-37d 51' 02"} (J2000),
                 -37.879d {-37d 52' 45"} (current),
                 -37.781d {-37d 46' 52"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       0 [cnts]    Image_Peak=27608 [image_cnts]
TRIGGER_DUR:     792.000 [sec]   (=13.2 [min])
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:        19426 TJD;   212 DOY;   21/07/31
GRB_TIME:        52388.53 SOD {14:33:08.53} UT
GRB_PHI:         -153.78 [deg]
GRB_THETA:        25.85 [deg]
SOLN_STATUS:     0x11D
RATE_SIGNIF:     0.00 [sigma]
IMAGE_SIGNIF:    17.05 [sigma]
MERIT_PARAMS:     +0  +0 +123  +2  +1  +5  +0  +1 +61  +0 
SUN_POSTN:       131.05d {+08h 44m 11s}  +18.10d {+18d 06' 15"}
SUN_DIST:        128.64 [deg]   Sun_angle= -8.4 [hr] (East of Sun)
MOON_POSTN:       37.83d {+02h 31m 18s}  +12.21d {+12d 12' 43"}
MOON_DIST:       137.17 [deg]
MOON_ILLUM:      50 [%]
GAL_COORDS:      347.75,  2.17 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      258.59,-14.96 [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=10638=IGR17091-3624,   delta=1.771 [deg].  
COMMENTS:        This matches a source in the ground catalog: 4U_1700-377,   delta=0.012 [deg].  
COMMENTS:        This is not a GRB.  
COMMENTS:        This is an interesting source.  
COMMENTS:        This trigger occurred at longitude,latitude = 123.91,-20.01 [deg].

GCN BAT Lightcurve Notice

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Sat 31 Jul 21 14:59:44 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     1062273,   Seg_Num: 0
GRB_RA:          255.992d {+17h 03m 58s} (J2000),
                 256.360d {+17h 05m 26s} (current),
                 255.143d {+17h 00m 34s} (1950)
GRB_DEC:         -37.851d {-37d 51' 02"} (J2000),
                 -37.879d {-37d 52' 45"} (current),
                 -37.781d {-37d 46' 52"} (1950)
GRB_DATE:        19426 TJD;   212 DOY;   21/07/31
GRB_TIME:        52388.53 SOD {14:33:08.53} UT
TRIGGER_INDEX:   20000
GRB_PHI:         -153.78 [deg]
GRB_THETA:        25.85 [deg]
DELTA_TIME:      0.00 [sec]
TRIGGER_DUR:     792.000 [sec]   (=13.2 [min])
SOLN_STATUS:     0x11D
RATE_SIGNIF:     0.00 [sigma]
IMAGE_SIGNIF:    17.05 [sigma]
LC_URL:          sw01062273000msb.lc

GCN template for BAT paragraph

  • Click here! 
    At 14:33:08 UT, the Swift Burst Alert Telescope (BAT) triggered and
located GRB 210731 ***A*** (trigger=1062273).  Swift slewed immediately to the burst.
The BAT on-board calculated location is 
RA, Dec 255.992, -37.851 which is 
   RA(J2000) = 17h 03m 58s
   Dec(J2000) = -37d 51' 02"
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 ~0 counts/sec (15-350 keV), at ~ 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)
------------------------------------------

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

    bat_grb_pos_cat.sh 255.992 -37.851 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 255.992 -37.851
4U 1700-377 10029 255.987 -37.844 0.008035439730018657

    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: 2021 7 31 15 295.598630  53.888172
 Obj: 2021 7 31 15 272.567588  -73.777178
  • the object visibility at GSFC, Greenbelt, Maryland 
     
MMT Observatory, Mt. Hopkins, Arizona
      TimeUT       Azimuth     Elevation
 Sun: 2021 7 31 15 264.986869  27.773749
 Obj: 2021 7 31 15 56.727256  -77.483765
  • the object visibility at MMT, Mt. Hopkins, Arizona 
     
Hale Telescope, Palomar Mountain, California
      TimeUT       Azimuth     Elevation
 Sun: 2021 7 31 15 262.808710  22.932465
 Obj: 2021 7 31 15 68.377047  -73.743877
  • the object visibility at Hale Telescope, Palomar Mt., California 
     
Mauna Kea, Hawaii
      TimeUT       Azimuth     Elevation
 Sun: 2021 7 31 15 244.634775  -13.781638
 Obj: 2021 7 31 15 56.935631  -37.135872
  • the object visibility at Mauna Kea, Hawaii 
     
Siding Spring Obs., Australia
      TimeUT       Azimuth     Elevation
 Sun: 2021 7 31 15 317.784124  -72.952030
 Obj: 2021 7 31 15 63.434446  35.842991
  • the object visibility at Siding Spring Obs., Australia 
     
Tokyo, Japan
      TimeUT       Azimuth     Elevation
 Sun: 2021 7 31 15 174.443663  -37.332479
 Obj: 2021 7 31 15 37.348220  4.047541
  • the object visibility at Tokyo, Japan 
     
William Herschel Telescope, La Palma, Canary Islands, Spain
      TimeUT       Azimuth     Elevation
 Sun: 2021 7 31 15 70.565401  64.754006
 Obj: 2021 7 31 15 301.210896  -24.794505
  • the object visibility at William Hershel Telescope, La Palma, Canary Islands, Spain 
     
Gemini South, Cerro Pachon, Chile
      TimeUT       Azimuth     Elevation
 Sun: 2021 7 31 15 212.892352  34.496461
 Obj: 2021 7 31 15 338.246599  -17.426075
  • the object visibility at Gemini South, Cerro Pachon, Chile 
     
 
 
The data/results are in /local/data/bat1/prebascript/trigger1062273/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:
Sat Jul 31 11:00:43 EDT 2021