TDRSS lightcurve for Trigger=1069551
Notes:
- 1) None of the TDRSS light curves are background subtracted.
GCN BAT Position Notice
TITLE: GCN/SWIFT NOTICE
NOTICE_DATE: Fri 20 Aug 21 17:39:07 UT
NOTICE_TYPE: Swift-BAT GRB Position
TRIGGER_NUM: 1069551, Seg_Num: 0
GRB_RA: 20.629d {+01h 22m 31s} (J2000),
20.910d {+01h 23m 38s} (current),
19.981d {+01h 19m 55s} (1950)
GRB_DEC: +4.632d {+04d 37' 55"} (J2000),
+4.745d {+04d 44' 41"} (current),
+4.371d {+04d 22' 15"} (1950)
GRB_ERROR: 3.00 [arcmin radius, statistical only]
GRB_INTEN: 46084 [cnts] Image_Peak=592 [image_cnts]
TRIGGER_DUR: 16.384 [sec]
TRIGGER_INDEX: 460 E_range: 15-50 keV
BKG_INTEN: 170822 [cnts]
BKG_TIME: 63380.41 SOD {17:36:20.41} UT
BKG_DUR: 64 [sec]
GRB_DATE: 19446 TJD; 232 DOY; 21/08/20
GRB_TIME: 63480.70 SOD {17:38:00.70} UT
GRB_PHI: -80.70 [deg]
GRB_THETA: 28.69 [deg]
SOLN_STATUS: 0x3
RATE_SIGNIF: 8.54 [sigma]
IMAGE_SIGNIF: 7.81 [sigma]
MERIT_PARAMS: +1 +0 +0 +4 +1 -2 +0 +0 +60 +0
SUN_POSTN: 150.10d {+10h 00m 23s} +12.19d {+12d 11' 39"}
SUN_DIST: 126.73 [deg] Sun_angle= 8.6 [hr] (West of Sun)
MOON_POSTN: 308.61d {+20h 34m 27s} -23.16d {-23d 09' 30"}
MOON_DIST: 75.75 [deg]
MOON_ILLUM: 96 [%]
GAL_COORDS: 137.40,-57.36 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS: 20.80, -3.76 [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 = 108.36,20.32 [deg].
GCN BAT Lightcurve Notice
TITLE: GCN/SWIFT NOTICE
NOTICE_DATE: Fri 20 Aug 21 17:56:48 UT
NOTICE_TYPE: Swift-BAT GRB Lightcurve
TRIGGER_NUM: 1069551, Seg_Num: 0
GRB_RA: 20.629d {+01h 22m 31s} (J2000),
20.910d {+01h 23m 38s} (current),
19.981d {+01h 19m 55s} (1950)
GRB_DEC: +4.632d {+04d 37' 55"} (J2000),
+4.745d {+04d 44' 41"} (current),
+4.371d {+04d 22' 15"} (1950)
GRB_DATE: 19446 TJD; 232 DOY; 21/08/20
GRB_TIME: 63480.70 SOD {17:38:00.70} UT
TRIGGER_INDEX: 460
GRB_PHI: -80.70 [deg]
GRB_THETA: 28.69 [deg]
DELTA_TIME: 51.00 [sec]
TRIGGER_DUR: 16.384 [sec]
SOLN_STATUS: 0x3
RATE_SIGNIF: 8.54 [sigma]
IMAGE_SIGNIF: 7.81 [sigma]
LC_URL: sw01069551000msb.lc
GCN template for BAT paragraph
Click here!
At 17:38:00 UT, the Swift Burst Alert Telescope (BAT) triggered and
located GRB 210820 ***A*** (trigger=1069551). Swift slewed immediately to the burst.
The BAT on-board calculated location is
RA, Dec 20.629, +4.632 which is
RA(J2000) = 01h 22m 31s
Dec(J2000) = +04d 37' 55"
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 ~1093 counts/sec (15-350 keV), at ~5 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: 155.392 s +/- 2.90513 s
Estimated T50 duration: 109.312 s +/- 4.16738 s
Estimated Peak Interval: MET 651174002.55999994 +/- 0.500000 s
Estimated background rate 1: 5305.833 near MET 651173892.000000 s
Estimated background rate 2: 5242.676 near MET 651174082.432000 s
Estimated total duration: 170.944 s (for data selection)
(from MET 651173899.200000 to MET 651174070.144000)
Estimated total fluence: 17883.686902 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 20.629 4.632 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 20.629 4.632
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: 2021 8 20 17 353.076477 63.035377
Obj: 2021 8 20 17 118.207640 -23.784857
the object visibility at GSFC, Greenbelt, Maryland
MMT Observatory, Mt. Hopkins, Arizona
TimeUT Azimuth Elevation
Sun: 2021 8 20 17 291.181189 50.645407
Obj: 2021 8 20 17 95.068404 0.786680
the object visibility at MMT, Mt. Hopkins, Arizona
Hale Telescope, Palomar Mountain, California
TimeUT Azimuth Elevation
Sun: 2021 8 20 17 287.834097 45.331713
Obj: 2021 8 20 17 91.768658 5.922181
the object visibility at Hale Telescope, Palomar Mt., California
Mauna Kea, Hawaii
TimeUT Azimuth Elevation
Sun: 2021 8 20 17 261.098977 11.680951
Obj: 2021 8 20 17 78.353148 41.488069
the object visibility at Mauna Kea, Hawaii
Siding Spring Obs., Australia
TimeUT Azimuth Elevation
Sun: 2021 8 20 17 286.146896 -46.343584
Obj: 2021 8 20 17 193.516002 53.130664
the object visibility at Siding Spring Obs., Australia
Tokyo, Japan
TimeUT Azimuth Elevation
Sun: 2021 8 20 17 212.709300 -37.226278
Obj: 2021 8 20 17 316.788567 52.515262
the object visibility at Tokyo, Japan
William Herschel Telescope, La Palma, Canary Islands, Spain
TimeUT Azimuth Elevation
Sun: 2021 8 20 17 84.422310 35.659788
Obj: 2021 8 20 17 188.911221 -56.184006
the object visibility at William Hershel Telescope, La Palma, Canary Islands, Spain
Gemini South, Cerro Pachon, Chile
TimeUT Azimuth Elevation
Sun: 2021 8 20 17 176.107141 47.354265
Obj: 2021 8 20 17 70.382290 -38.039042
the object visibility at Gemini South, Cerro Pachon, Chile
The data/results are in /local/data/bat1/prebascript/trigger1069551/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:
Fri Aug 20 13:58:04 EDT 2021