TDRSS lightcurve for Trigger=668949
Notes:
- 1) None of the TDRSS light curves are background subtracted.
GCN BAT Position Notice
TITLE: GCN/SWIFT NOTICE
NOTICE_DATE: Thu 31 Dec 15 17:18:20 UT
NOTICE_TYPE: Swift-BAT GRB Position
TRIGGER_NUM: 668949, Seg_Num: 0
GRB_RA: 305.996d {+20h 23m 59s} (J2000),
306.153d {+20h 24m 37s} (current),
305.507d {+20h 22m 02s} (1950)
GRB_DEC: +33.859d {+33d 51' 34"} (J2000),
+33.912d {+33d 54' 43"} (current),
+33.697d {+33d 41' 49"} (1950)
GRB_ERROR: 3.00 [arcmin radius, statistical only]
GRB_INTEN: 2792 [cnts] Image_Peak=96 [image_cnts]
TRIGGER_DUR: 1.024 [sec]
TRIGGER_INDEX: 150 E_range: 25-100 keV
BKG_INTEN: 18931 [cnts]
BKG_TIME: 62264.36 SOD {17:17:44.36} UT
BKG_DUR: 8 [sec]
GRB_DATE: 17387 TJD; 365 DOY; 15/12/31
GRB_TIME: 62278.31 SOD {17:17:58.31} UT
GRB_PHI: -159.03 [deg]
GRB_THETA: 50.78 [deg]
SOLN_STATUS: 0x3000018D
RATE_SIGNIF: 8.54 [sigma]
IMAGE_SIGNIF: 6.99 [sigma]
MERIT_PARAMS: +0 +0 +113 +0 +2 -3 +0 +1 -47 +0
SUN_POSTN: 280.55d {+18h 42m 13s} -23.08d {-23d 04' 54"}
SUN_DIST: 61.98 [deg] Sun_angle= -1.7 [hr] (East of Sun)
MOON_POSTN: 173.89d {+11h 35m 33s} +2.53d {+02d 31' 48"}
MOON_DIST: 122.21 [deg]
MOON_ILLUM: 64 [%]
GAL_COORDS: 73.10, -2.08 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS: 321.03, 51.12 [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 matches a source in the on-board catalog: Num=10763=(null) (probably an AT_Slot).
COMMENTS: This matches a source in the ground catalog: V_404_Cyg, delta=0.018 [deg].
COMMENTS: This is not a GRB.
COMMENTS: Since the IMAGE_SIGNIF is less than 7 sigma, this is a questionable detection.
COMMENTS: This trigger occurred at longitude,latitude = 229.00,-11.52 [deg].
COMMENTS:
GCN BAT Lightcurve Notice
TITLE: GCN/SWIFT NOTICE
NOTICE_DATE: Thu 31 Dec 15 17:35:04 UT
NOTICE_TYPE: Swift-BAT GRB Lightcurve
TRIGGER_NUM: 668949, Seg_Num: 0
GRB_RA: 305.996d {+20h 23m 59s} (J2000),
306.153d {+20h 24m 37s} (current),
305.507d {+20h 22m 02s} (1950)
GRB_DEC: +33.859d {+33d 51' 34"} (J2000),
+33.912d {+33d 54' 43"} (current),
+33.697d {+33d 41' 49"} (1950)
GRB_DATE: 17387 TJD; 365 DOY; 15/12/31
GRB_TIME: 62278.31 SOD {17:17:58.31} UT
TRIGGER_INDEX: 150
GRB_PHI: -159.03 [deg]
GRB_THETA: 50.78 [deg]
DELTA_TIME: 45.00 [sec]
TRIGGER_DUR: 1.024 [sec]
SOLN_STATUS: 0x18D
RATE_SIGNIF: 8.54 [sigma]
IMAGE_SIGNIF: 6.99 [sigma]
LC_URL: sw00668949000msb.lc
GCN template for BAT paragraph
Click here!
At 17:17:58 UT, the Swift Burst Alert Telescope (BAT) triggered and
located GRB 151231 ***A*** (trigger=668949). Swift slewed immediately to the burst.
The BAT on-board calculated location is
RA, Dec 305.996, +33.859 which is
RA(J2000) = 20h 23m 59s
Dec(J2000) = +33d 51' 34"
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 ~1195 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: 114.752 s +/- 2.90513 s
Estimated T50 duration: 58.496 s +/- 28.4206 s
Estimated Peak Interval: MET 473275094.39999998 +/- 0.500000 s
Estimated background rate 1: 4613.294 near MET 473275080.480000 s
Estimated background rate 2: 4490.560 near MET 473275249.600000 s
Estimated total duration: 128.32 s (for data selection)
(from MET 473275090.560000 to MET 473275218.880000)
Estimated total fluence: 10405.150739 count
Created GTI with 6 entries
------------------------------------------
Search for this GRB position to the previously BAT detected GRB positions (search radius within 5 arcmin)
bat_grb_pos_cat.sh 305.996 33.859 0.083
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: 2015 12 31 17 356.755454 27.804483
Obj: 2015 12 31 17 273.510984 66.431379
the object visibility at GSFC, Greenbelt, Maryland
MMT Observatory, Mt. Hopkins, Arizona
TimeUT Azimuth Elevation
Sun: 2015 12 31 17 322.329979 24.684813
Obj: 2015 12 31 17 249.554886 38.044418
the object visibility at MMT, Mt. Hopkins, Arizona
Hale Telescope, Palomar Mountain, California
TimeUT Azimuth Elevation
Sun: 2015 12 31 17 317.950294 20.171249
Obj: 2015 12 31 17 248.773046 33.918167
the object visibility at Hale Telescope, Palomar Mt., California
Mauna Kea, Hawaii
TimeUT Azimuth Elevation
Sun: 2015 12 31 17 294.455686 -0.506478
Obj: 2015 12 31 17 232.471450 -2.498510
the object visibility at Mauna Kea, Hawaii
Siding Spring Obs., Australia
TimeUT Azimuth Elevation
Sun: 2015 12 31 17 317.626144 -21.924213
Obj: 2015 12 31 17 255.156156 -75.281333
the object visibility at Siding Spring Obs., Australia
Tokyo, Japan
TimeUT Azimuth Elevation
Sun: 2015 12 31 17 250.650706 -64.505845
Obj: 2015 12 31 17 180.542696 -21.716959
the object visibility at Tokyo, Japan
William Herschel Telescope, La Palma, Canary Islands, Spain
TimeUT Azimuth Elevation
Sun: 2015 12 31 17 52.137886 15.254146
Obj: 2015 12 31 17 109.036046 63.714519
the object visibility at William Hershel Telescope, La Palma, Canary Islands, Spain
Gemini South, Cerro Pachon, Chile
TimeUT Azimuth Elevation
Sun: 2015 12 31 17 160.431614 82.337093
Obj: 2015 12 31 17 200.352981 22.200213
the object visibility at Gemini South, Cerro Pachon, Chile
The data/results are in /local/data/bat1/prebascript/trigger668949/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 Dec 31 12:35:22 EST 2015