TDRSS lightcurve for Trigger=968211
Notes:
- 1) None of the TDRSS light curves are background subtracted.
GCN BAT Position Notice
TITLE: GCN/SWIFT NOTICE
NOTICE_DATE: Mon 27 Apr 20 18:26:35 UT
NOTICE_TYPE: Swift-BAT GRB Position
TRIGGER_NUM: 968211, Seg_Num: 0
GRB_RA: 293.735d {+19h 34m 56s} (J2000),
293.954d {+19h 35m 49s} (current),
293.197d {+19h 32m 47s} (1950)
GRB_DEC: +21.895d {+21d 53' 43"} (J2000),
+21.941d {+21d 56' 28"} (current),
+21.785d {+21d 47' 04"} (1950)
GRB_ERROR: 3.00 [arcmin radius, statistical only]
GRB_INTEN: 1427 [cnts] Image_Peak=357 [image_cnts]
TRIGGER_DUR: 0.032 [sec]
TRIGGER_INDEX: 10309 E_range: 15-50 keV
BKG_INTEN: 17253 [cnts]
BKG_TIME: 66367.15 SOD {18:26:07.15} UT
BKG_DUR: 8 [sec]
GRB_DATE: 18966 TJD; 118 DOY; 20/04/27
GRB_TIME: 66379.95 SOD {18:26:19.95} UT
GRB_PHI: 1.52 [deg]
GRB_THETA: 28.22 [deg]
SOLN_STATUS: 0x2000010D
RATE_SIGNIF: 159.54 [sigma]
IMAGE_SIGNIF: 19.26 [sigma]
MERIT_PARAMS: +0 +0 +2 -5 +1 +6 +0 +1 +9 +0
SUN_POSTN: 35.58d {+02h 22m 20s} +14.16d {+14d 09' 26"}
SUN_DIST: 95.16 [deg] Sun_angle= 6.8 [hr] (West of Sun)
MOON_POSTN: 90.50d {+06h 01m 59s} +23.49d {+23d 29' 25"}
MOON_DIST: 129.16 [deg]
MOON_ILLUM: 20 [%]
GAL_COORDS: 57.25, 0.82 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS: 300.62, 42.84 [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=10762=sgr1935p2154, delta=0.004 [deg].
COMMENTS: This matches a source in the ground catalog: sgr1935p2154, delta=0.004 [deg].
COMMENTS: This is not a GRB.
COMMENTS: This is an interesting source.
COMMENTS: This trigger occurred at longitude,latitude = 166.50,-20.33 [deg].
COMMENTS:
GCN BAT Lightcurve Notice
TITLE: GCN/SWIFT NOTICE
NOTICE_DATE: Mon 27 Apr 20 18:30:52 UT
NOTICE_TYPE: Swift-BAT GRB Lightcurve
TRIGGER_NUM: 968211, Seg_Num: 0
GRB_RA: 293.735d {+19h 34m 56s} (J2000),
293.954d {+19h 35m 49s} (current),
293.197d {+19h 32m 47s} (1950)
GRB_DEC: +21.895d {+21d 53' 43"} (J2000),
+21.941d {+21d 56' 28"} (current),
+21.785d {+21d 47' 04"} (1950)
GRB_DATE: 18966 TJD; 118 DOY; 20/04/27
GRB_TIME: 66380.14 SOD {18:26:20.14} UT
TRIGGER_INDEX: 10309
GRB_PHI: 1.52 [deg]
GRB_THETA: 28.22 [deg]
DELTA_TIME: -17.00 [sec]
TRIGGER_DUR: 0.032 [sec]
SOLN_STATUS: 0x10D
RATE_SIGNIF: 159.54 [sigma]
IMAGE_SIGNIF: 19.26 [sigma]
LC_URL: sw00968211000msb.lc
GCN template for BAT paragraph
Click here!
At 18:26:20 UT, the Swift Burst Alert Telescope (BAT) triggered and
located GRB 200427 ***A*** (trigger=968211). Swift slewed immediately to the burst.
The BAT on-board calculated location is
RA, Dec 293.735, +21.895 which is
RA(J2000) = 19h 34m 56s
Dec(J2000) = +21d 53' 43"
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 ~14601 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
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: 23.936 s +/- 45.12 s
Estimated T50 duration: 0.128 s +/- 0.128 s
Estimated Peak Interval: MET 609704805.18400002 +/- 0.500000 s
Estimated background rate 1: 3980.200 near MET 609704792.896000 s
Estimated background rate 2: 3894.832 near MET 609704937.472000 s
Estimated total duration: 79.232 s (for data selection)
(from MET 609704804.992000 to MET 609704884.224000)
Estimated total fluence: 2307.042263 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 293.735 21.895 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 293.735 21.895
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: 2020 4 27 18 28.790946 62.537145
Obj: 2020 4 27 18 122.475849 -3.922830
the object visibility at GSFC, Greenbelt, Maryland
MMT Observatory, Mt. Hopkins, Arizona
TimeUT Azimuth Elevation
Sun: 2020 4 27 18 307.946333 64.139397
Obj: 2020 4 27 18 104.713833 18.734801
the object visibility at MMT, Mt. Hopkins, Arizona
Hale Telescope, Palomar Mountain, California
TimeUT Azimuth Elevation
Sun: 2020 4 27 18 301.906877 59.045311
Obj: 2020 4 27 18 101.303782 24.026154
the object visibility at Hale Telescope, Palomar Mt., California
Mauna Kea, Hawaii
TimeUT Azimuth Elevation
Sun: 2020 4 27 18 263.983286 27.576447
Obj: 2020 4 27 18 100.097313 56.106867
the object visibility at Mauna Kea, Hawaii
Siding Spring Obs., Australia
TimeUT Azimuth Elevation
Sun: 2020 4 27 18 273.360493 -33.501607
Obj: 2020 4 27 18 201.503155 33.650067
the object visibility at Siding Spring Obs., Australia
Tokyo, Japan
TimeUT Azimuth Elevation
Sun: 2020 4 27 18 227.297451 -26.838923
Obj: 2020 4 27 18 282.133728 56.255753
the object visibility at Tokyo, Japan
William Herschel Telescope, La Palma, Canary Islands, Spain
TimeUT Azimuth Elevation
Sun: 2020 4 27 18 94.467786 22.116951
Obj: 2020 4 27 18 172.659451 -38.989277
the object visibility at William Hershel Telescope, La Palma, Canary Islands, Spain
Gemini South, Cerro Pachon, Chile
TimeUT Azimuth Elevation
Sun: 2020 4 27 18 154.746981 41.813811
Obj: 2020 4 27 18 95.939972 -36.760341
the object visibility at Gemini South, Cerro Pachon, Chile
The data/results are in /local/data/bat1/prebascript/trigger968211/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 Apr 27 14:32:23 EDT 2020