TDRSS lightcurve for Trigger=1044426
Notes:
- 1) None of the TDRSS light curves are background subtracted.
GCN BAT Position Notice
TITLE: GCN/SWIFT NOTICE
NOTICE_DATE: Wed 21 Apr 21 00:27:55 UT
NOTICE_TYPE: Swift-BAT GRB Position
TRIGGER_NUM: 1044426, Seg_Num: 0
GRB_RA: 104.908d {+06h 59m 38s} (J2000),
105.191d {+07h 00m 46s} (current),
104.244d {+06h 56m 59s} (1950)
GRB_DEC: +4.934d {+04d 56' 03"} (J2000),
+4.903d {+04d 54' 12"} (current),
+5.004d {+05d 00' 15"} (1950)
GRB_ERROR: 3.00 [arcmin radius, statistical only]
GRB_INTEN: 6363 [cnts] Image_Peak=280 [image_cnts]
TRIGGER_DUR: 2.048 [sec]
TRIGGER_INDEX: 253 E_range: 15-50 keV
BKG_INTEN: 60653 [cnts]
BKG_TIME: 1613.11 SOD {00:26:53.11} UT
BKG_DUR: 24 [sec]
GRB_DATE: 19325 TJD; 111 DOY; 21/04/21
GRB_TIME: 1650.30 SOD {00:27:30.30} UT
GRB_PHI: 24.95 [deg]
GRB_THETA: 34.19 [deg]
SOLN_STATUS: 0x3
RATE_SIGNIF: 11.44 [sigma]
IMAGE_SIGNIF: 10.17 [sigma]
MERIT_PARAMS: +1 +0 +0 +1 +1 +0 +0 +1 -25 +0
SUN_POSTN: 29.00d {+01h 56m 00s} +11.87d {+11d 52' 07"}
SUN_DIST: 75.50 [deg] Sun_angle= -5.1 [hr] (East of Sun)
MOON_POSTN: 133.34d {+08h 53m 23s} +22.15d {+22d 08' 53"}
MOON_DIST: 32.23 [deg]
MOON_ILLUM: 58 [%]
GAL_COORDS: 209.47, 4.07 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS: 105.61,-17.70 [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 = 211.05,12.46 [deg].
GCN BAT Lightcurve Notice
TITLE: GCN/SWIFT NOTICE
NOTICE_DATE: Wed 21 Apr 21 00:31:18 UT
NOTICE_TYPE: Swift-BAT GRB Lightcurve
TRIGGER_NUM: 1044426, Seg_Num: 0
GRB_RA: 104.908d {+06h 59m 38s} (J2000),
105.191d {+07h 00m 46s} (current),
104.244d {+06h 56m 59s} (1950)
GRB_DEC: +4.934d {+04d 56' 03"} (J2000),
+4.903d {+04d 54' 12"} (current),
+5.004d {+05d 00' 15"} (1950)
GRB_DATE: 19325 TJD; 111 DOY; 21/04/21
GRB_TIME: 1650.30 SOD {00:27:30.30} UT
TRIGGER_INDEX: 253
GRB_PHI: 24.95 [deg]
GRB_THETA: 34.19 [deg]
DELTA_TIME: -38.00 [sec]
TRIGGER_DUR: 2.048 [sec]
SOLN_STATUS: 0x3
RATE_SIGNIF: 11.44 [sigma]
IMAGE_SIGNIF: 10.17 [sigma]
LC_URL: sw01044426000msb.lc
GCN template for BAT paragraph
Click here!
At 00:27:30 UT, the Swift Burst Alert Telescope (BAT) triggered and
located GRB 210421 ***A*** (trigger=1044426). Swift slewed immediately to the burst.
The BAT on-board calculated location is
RA, Dec 104.908, +4.934 which is
RA(J2000) = 06h 59m 38s
Dec(J2000) = +04d 56' 03"
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 ~1507 counts/sec (15-350 keV), at ~2 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: 25.408 s +/- 1.13499 s
Estimated T50 duration: 15.68 s +/- 1.13499 s
Estimated Peak Interval: MET 640657680.00000000 +/- 0.500000 s
Estimated background rate 1: 4369.687 near MET 640657654.400000 s
Estimated background rate 2: 4491.026 near MET 640657795.136000 s
Estimated total duration: 71.552 s (for data selection)
(from MET 640657656.000000 to MET 640657727.552000)
Estimated total fluence: 11705.590979 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 104.908 4.934 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 104.908 4.934
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 4 21 0 107.329797 -2.368096
Obj: 2021 4 21 0 42.225273 48.165969
the object visibility at GSFC, Greenbelt, Maryland
MMT Observatory, Mt. Hopkins, Arizona
TimeUT Azimuth Elevation
Sun: 2021 4 21 0 89.385048 24.011641
Obj: 2021 4 21 0 344.212912 62.344167
the object visibility at MMT, Mt. Hopkins, Arizona
Hale Telescope, Palomar Mountain, California
TimeUT Azimuth Elevation
Sun: 2021 4 21 0 85.216585 28.974429
Obj: 2021 4 21 0 333.668457 58.967397
the object visibility at Hale Telescope, Palomar Mt., California
Mauna Kea, Hawaii
TimeUT Azimuth Elevation
Sun: 2021 4 21 0 74.871425 65.283880
Obj: 2021 4 21 0 279.304394 37.402371
the object visibility at Mauna Kea, Hawaii
Siding Spring Obs., Australia
TimeUT Azimuth Elevation
Sun: 2021 4 21 0 219.627695 37.496942
Obj: 2021 4 21 0 274.871197 -17.371000
the object visibility at Siding Spring Obs., Australia
Tokyo, Japan
TimeUT Azimuth Elevation
Sun: 2021 4 21 0 285.594353 41.212922
Obj: 2021 4 21 0 245.032134 -24.284193
the object visibility at Tokyo, Japan
William Herschel Telescope, La Palma, Canary Islands, Spain
TimeUT Azimuth Elevation
Sun: 2021 4 21 0 154.194091 -45.807267
Obj: 2021 4 21 0 92.258658 6.063730
the object visibility at William Hershel Telescope, La Palma, Canary Islands, Spain
Gemini South, Cerro Pachon, Chile
TimeUT Azimuth Elevation
Sun: 2021 4 21 0 91.113894 -22.148222
Obj: 2021 4 21 0 132.812513 42.901915
the object visibility at Gemini South, Cerro Pachon, Chile
The data/results are in /local/data/bat1/prebascript/trigger1044426/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:
Tue Apr 20 20:34:22 EDT 2021