TDRSS lightcurve for Trigger=889483

Notes:

GCN BAT Position Notice

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 18 Feb 19 08:59:55 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     889483,   Seg_Num: 0
GRB_RA:          284.640d {+18h 58m 34s} (J2000),
                 284.900d {+18h 59m 36s} (current),
                 283.960d {+18h 55m 50s} (1950)
GRB_DEC:          -8.235d {-08d 14' 05"} (J2000),
                  -8.208d {-08d 12' 28"} (current),
                  -8.304d {-08d 18' 13"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       0 [cnts]    Image_Peak=3705 [image_cnts]
TRIGGER_DUR:     320.000 [sec]   (=5.3 [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:        18532 TJD;    49 DOY;   19/02/18
GRB_TIME:        32049.56 SOD {08:54:09.56} UT
GRB_PHI:         -115.81 [deg]
GRB_THETA:         6.59 [deg]
SOLN_STATUS:     0x13
RATE_SIGNIF:     0.00 [sigma]
IMAGE_SIGNIF:    8.54 [sigma]
MERIT_PARAMS:     +1  +0  +0  +6  +1  -1  +0  +1 -68  +0 
SUN_POSTN:       331.52d {+22h 06m 06s}  -11.68d {-11d 40' 38"}
SUN_DIST:         46.01 [deg]   Sun_angle= 3.1 [hr] (West of Sun)
MOON_POSTN:      134.22d {+08h 56m 54s}  +18.73d {+18d 43' 42"}
MOON_DIST:       149.66 [deg]
MOON_ILLUM:      98 [%]
GAL_COORDS:       26.39, -5.32 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      284.97, 14.45 [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 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 = 4.51,19.59 [deg].

GCN BAT Lightcurve Notice

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Mon 18 Feb 19 09:23:42 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     889483,   Seg_Num: 0
GRB_RA:          284.640d {+18h 58m 34s} (J2000),
                 284.900d {+18h 59m 36s} (current),
                 283.960d {+18h 55m 50s} (1950)
GRB_DEC:          -8.235d {-08d 14' 05"} (J2000),
                  -8.208d {-08d 12' 28"} (current),
                  -8.304d {-08d 18' 13"} (1950)
GRB_DATE:        18532 TJD;    49 DOY;   19/02/18
GRB_TIME:        32049.56 SOD {08:54:09.56} UT
TRIGGER_INDEX:   20000
GRB_PHI:         -115.81 [deg]
GRB_THETA:         6.59 [deg]
DELTA_TIME:      0.00 [sec]
TRIGGER_DUR:     320.000 [sec]   (=5.3 [min])
SOLN_STATUS:     0x13
RATE_SIGNIF:     0.00 [sigma]
IMAGE_SIGNIF:    8.54 [sigma]
LC_URL:          sw00889483000msb.lc

GCN template for BAT paragraph

  • Click here! 
    At 08:54:09 UT, the Swift Burst Alert Telescope (BAT) triggered and
located GRB 190218 ***A*** (trigger=889483).  Swift slewed immediately to the burst.
The BAT on-board calculated location is 
RA, Dec 284.640, -8.235 which is 
   RA(J2000) = 18h 58m 34s
   Dec(J2000) = -08d 14' 05"
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 ~953 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 background rate 1:     3984.470 near MET 572172905.856000 s
  Estimated background rate 2:     4045.134 near MET 572173010.816000 s
  Estimated total fluence: 0.000000 count
  Created GTI with 2 entries
------------------------------------------

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

    bat_grb_pos_cat.sh 284.640 -8.235 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 284.640 -8.235
SWIFT J1858.6-0814 34133 284.673 -8.245 0.03415948403669136

    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: 2019 2 18 9 255.597390  -35.009914
 Obj: 2019 2 18 9 283.156941  3.047974
  • the object visibility at GSFC, Greenbelt, Maryland 
     
MMT Observatory, Mt. Hopkins, Arizona
      TimeUT       Azimuth     Elevation
 Sun: 2019 2 18 9 227.331166  -62.731020
 Obj: 2019 2 18 9 264.747026  -24.065720
  • the object visibility at MMT, Mt. Hopkins, Arizona 
     
Hale Telescope, Palomar Mountain, California
      TimeUT       Azimuth     Elevation
 Sun: 2019 2 18 9 214.144912  -64.769435
 Obj: 2019 2 18 9 260.382194  -28.852114
  • the object visibility at Hale Telescope, Palomar Mt., California 
     
Mauna Kea, Hawaii
      TimeUT       Azimuth     Elevation
 Sun: 2019 2 18 9 105.455569  -65.146442
 Obj: 2019 2 18 9 244.692217  -65.600188
  • the object visibility at Mauna Kea, Hawaii 
     
Siding Spring Obs., Australia
      TimeUT       Azimuth     Elevation
 Sun: 2019 2 18 9 74.795933  -2.408722
 Obj: 2019 2 18 9 44.555726  -39.294846
  • the object visibility at Siding Spring Obs., Australia 
     
Tokyo, Japan
      TimeUT       Azimuth     Elevation
 Sun: 2019 2 18 9 76.700427  -1.322163
 Obj: 2019 2 18 9 107.753405  -37.376872
  • the object visibility at Tokyo, Japan 
     
William Herschel Telescope, La Palma, Canary Islands, Spain
      TimeUT       Azimuth     Elevation
 Sun: 2019 2 18 9 291.928582  13.846339
 Obj: 2019 2 18 9 329.094831  48.177054
  • the object visibility at William Hershel Telescope, La Palma, Canary Islands, Spain 
     
Gemini South, Cerro Pachon, Chile
      TimeUT       Azimuth     Elevation
 Sun: 2019 2 18 9 296.434631  -18.693779
 Obj: 2019 2 18 9 268.783239  18.451486
  • the object visibility at Gemini South, Cerro Pachon, Chile 
     
 
 
The data/results are in /local/data/bat1/prebascript/trigger889483/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 Feb 18 04:24:03 EST 2019