TDRSS lightcurve for Trigger=1073821
Notes:
- 1) None of the TDRSS light curves are background subtracted.
GCN BAT Position Notice
TITLE: GCN/SWIFT NOTICE
NOTICE_DATE: Sat 18 Sep 21 07:59:35 UT
NOTICE_TYPE: Swift-BAT GRB Position
TRIGGER_NUM: 1073821, Seg_Num: 0
GRB_RA: 250.455d {+16h 41m 49s} (J2000),
250.850d {+16h 43m 24s} (current),
249.548d {+16h 38m 12s} (1950)
GRB_DEC: -45.540d {-45d 32' 22"} (J2000),
-45.580d {-45d 34' 46"} (current),
-45.444d {-45d 26' 39"} (1950)
GRB_ERROR: 3.00 [arcmin radius, statistical only]
GRB_INTEN: 0 [cnts] Image_Peak=1368 [image_cnts]
TRIGGER_DUR: 64.000 [sec]
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: 19475 TJD; 261 DOY; 21/09/18
GRB_TIME: 28700.25 SOD {07:58:20.25} UT
GRB_PHI: -139.31 [deg]
GRB_THETA: 22.35 [deg]
SOLN_STATUS: 0x19D
RATE_SIGNIF: 0.00 [sigma]
IMAGE_SIGNIF: 6.79 [sigma]
MERIT_PARAMS: +0 +0 +123 +6 +1 -3 +0 +1 -16 +0
SUN_POSTN: 175.99d {+11h 43m 58s} +1.74d {+01d 44' 07"}
SUN_DIST: 80.73 [deg] Sun_angle= -5.0 [hr] (East of Sun)
MOON_POSTN: 327.10d {+21h 48m 23s} -18.54d {-18d 32' 22"}
MOON_DIST: 67.37 [deg]
MOON_ILLUM: 92 [%]
GAL_COORDS: 339.19, 0.49 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS: 255.24,-23.10 [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 matches a source in the on-board catalog: Num=10632=IGR16418-4532, delta=0.008 [deg].
COMMENTS: This matches a source in the ground catalog: IGRJ16418-4532, delta=0.003 [deg].
COMMENTS: This is not a GRB.
COMMENTS: This is an interesting source.
COMMENTS: Since the IMAGE_SIGNIF is less than 7 sigma, this is a questionable detection.
COMMENTS: This trigger occurred at longitude,latitude = 177.80,-17.51 [deg].
GCN BAT Lightcurve Notice
TITLE: GCN/SWIFT NOTICE
NOTICE_DATE: Sat 18 Sep 21 08:16:15 UT
NOTICE_TYPE: Swift-BAT GRB Lightcurve
TRIGGER_NUM: 1073821, Seg_Num: 0
GRB_RA: 250.455d {+16h 41m 49s} (J2000),
250.850d {+16h 43m 24s} (current),
249.548d {+16h 38m 12s} (1950)
GRB_DEC: -45.540d {-45d 32' 22"} (J2000),
-45.580d {-45d 34' 46"} (current),
-45.444d {-45d 26' 39"} (1950)
GRB_DATE: 19475 TJD; 261 DOY; 21/09/18
GRB_TIME: 28700.25 SOD {07:58:20.25} UT
TRIGGER_INDEX: 20000
GRB_PHI: -139.31 [deg]
GRB_THETA: 22.35 [deg]
DELTA_TIME: 0.00 [sec]
TRIGGER_DUR: 64.000 [sec]
SOLN_STATUS: 0x19D
RATE_SIGNIF: 0.00 [sigma]
IMAGE_SIGNIF: 6.79 [sigma]
LC_URL: sw01073821000msb.lc
GCN template for BAT paragraph
Click here!
At 07:58:20 UT, the Swift Burst Alert Telescope (BAT) triggered and
located GRB 210918 ***A*** (trigger=1073821). Swift slewed immediately to the burst.
The BAT on-board calculated location is
RA, Dec 250.455, -45.540 which is
RA(J2000) = 16h 41m 49s
Dec(J2000) = -45d 32' 22"
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 ~1265 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
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: 4601.886 near MET 653644808.960000 s
Estimated background rate 2: 4601.886 near MET 653644808.960000 s
Estimated total fluence: 0.000000 count
Created GTI with 1 entries
------------------------------------------
Search for this GRB position to the previously BAT detected GRB positions (search radius within 5 arcmin)
bat_grb_pos_cat.sh 250.455 -45.540 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 250.455 -45.540
IGR J16418-4532 10632 250.463 -45.542 0.005947585014473103
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 9 18 8 235.650103 -32.635922
Obj: 2021 9 18 8 63.753146 -66.491347
the object visibility at GSFC, Greenbelt, Maryland
MMT Observatory, Mt. Hopkins, Arizona
TimeUT Azimuth Elevation
Sun: 2021 9 18 8 197.888604 -55.256011
Obj: 2021 9 18 8 54.534906 -39.013590
the object visibility at MMT, Mt. Hopkins, Arizona
Hale Telescope, Palomar Mountain, California
TimeUT Azimuth Elevation
Sun: 2021 9 18 8 187.119127 -54.721440
Obj: 2021 9 18 8 54.593469 -35.867123
the object visibility at Hale Telescope, Palomar Mt., California
Mauna Kea, Hawaii
TimeUT Azimuth Elevation
Sun: 2021 9 18 8 118.552328 -49.903305
Obj: 2021 9 18 8 41.345267 -1.427234
the object visibility at Mauna Kea, Hawaii
Siding Spring Obs., Australia
TimeUT Azimuth Elevation
Sun: 2021 9 18 8 91.459505 -0.972405
Obj: 2021 9 18 8 35.238916 71.456414
the object visibility at Siding Spring Obs., Australia
Tokyo, Japan
TimeUT Azimuth Elevation
Sun: 2021 9 18 8 81.911509 14.581209
Obj: 2021 9 18 8 358.985735 9.970441
the object visibility at Tokyo, Japan
William Herschel Telescope, La Palma, Canary Islands, Spain
TimeUT Azimuth Elevation
Sun: 2021 9 18 8 274.837539 12.265206
Obj: 2021 9 18 8 314.860341 -62.163896
the object visibility at William Hershel Telescope, La Palma, Canary Islands, Spain
Gemini South, Cerro Pachon, Chile
TimeUT Azimuth Elevation
Sun: 2021 9 18 8 291.297350 -34.772530
Obj: 2021 9 18 8 17.430880 -10.834736
the object visibility at Gemini South, Cerro Pachon, Chile
The data/results are in /local/data/bat1/prebascript/trigger1073821/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:
Sat Sep 18 04:17:25 EDT 2021