TDRSS lightcurve for Trigger=1222885
Notes:
- 1) None of the TDRSS light curves are background subtracted.
GCN BAT Position Notice
TITLE: GCN/SWIFT NOTICE
NOTICE_DATE: Thu 18 Apr 24 20:25:00 UT
NOTICE_TYPE: Swift-BAT GRB Position
TRIGGER_NUM: 1222885, Seg_Num: 0
GRB_RA: 239.322d {+15h 57m 17s} (J2000),
239.582d {+15h 58m 20s} (current),
238.786d {+15h 55m 09s} (1950)
GRB_DEC: +23.607d {+23d 36' 26"} (J2000),
+23.539d {+23d 32' 19"} (current),
+23.750d {+23d 45' 02"} (1950)
GRB_ERROR: 3.00 [arcmin radius, statistical only]
GRB_INTEN: 26027 [cnts] Image_Peak=506 [image_cnts]
TRIGGER_DUR: 8.192 [sec]
TRIGGER_INDEX: 453 E_range: 15-50 keV
BKG_INTEN: 186097 [cnts]
BKG_TIME: 73358.70 SOD {20:22:38.70} UT
BKG_DUR: 64 [sec]
GRB_DATE: 20418 TJD; 109 DOY; 24/04/18
GRB_TIME: 73448.17 SOD {20:24:08.17} UT
GRB_PHI: -109.52 [deg]
GRB_THETA: 20.38 [deg]
SOLN_STATUS: 0x3
RATE_SIGNIF: 12.64 [sigma]
IMAGE_SIGNIF: 7.96 [sigma]
MERIT_PARAMS: +1 +0 +0 +3 +1 -2 +0 +0 +68 +0
SUN_POSTN: 27.23d {+01h 48m 56s} +11.22d {+11d 13' 10"}
SUN_DIST: 133.00 [deg] Sun_angle= 9.8 [hr] (West of Sun)
MOON_POSTN: 156.35d {+10h 25m 25s} +13.76d {+13d 45' 41"}
MOON_DIST: 78.46 [deg]
MOON_ILLUM: 78 [%]
GAL_COORDS: 38.83, 48.10 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS: 230.33, 42.91 [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 = 139.75,15.53 [deg].
GCN BAT Lightcurve Notice
TITLE: GCN/SWIFT NOTICE
NOTICE_DATE: Thu 18 Apr 24 20:53:45 UT
NOTICE_TYPE: Swift-BAT GRB Lightcurve
TRIGGER_NUM: 1222885, Seg_Num: 0
GRB_RA: 239.322d {+15h 57m 17s} (J2000),
239.582d {+15h 58m 20s} (current),
238.786d {+15h 55m 09s} (1950)
GRB_DEC: +23.607d {+23d 36' 26"} (J2000),
+23.539d {+23d 32' 19"} (current),
+23.750d {+23d 45' 02"} (1950)
GRB_DATE: 20418 TJD; 109 DOY; 24/04/18
GRB_TIME: 73448.17 SOD {20:24:08.17} UT
TRIGGER_INDEX: 453
GRB_PHI: -109.52 [deg]
GRB_THETA: 20.38 [deg]
DELTA_TIME: 12.00 [sec]
TRIGGER_DUR: 8.192 [sec]
SOLN_STATUS: 0x3
RATE_SIGNIF: 12.64 [sigma]
IMAGE_SIGNIF: 7.96 [sigma]
LC_URL: sw01222885000msb.lc
GCN template for BAT paragraph
Click here!
At 20:24:08 UT, the Swift Burst Alert Telescope (BAT) triggered and
located GRB 240418 ***A*** (trigger=1222885). Swift slewed immediately to the burst.
The BAT on-board calculated location is
RA, Dec 239.322, +23.607 which is
RA(J2000) = 15h 57m 17s
Dec(J2000) = +23d 36' 26"
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 ~1077 counts/sec (15-350 keV), at ~7 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 T90 duration: 65.792 s +/- 2.89772 s
Estimated T50 duration: 44.16 s +/- 4.10399 s
Estimated Peak Interval: MET 735164742.59199989 +/- 0.500000 s
Estimated background rate 1: 4735.466 near MET 735164669.056000 s
Estimated background rate 2: 4461.787 near MET 735164820.416000 s
Estimated total duration: 92.8 s (for data selection)
(from MET 735164680.512000 to MET 735164773.312000)
Estimated total fluence: 9728.521877 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 239.322 23.607 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 239.322 23.607
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: 2024 4 18 20 65.666895 42.934872
Obj: 2024 4 18 20 190.742045 -26.728485
the object visibility at GSFC, Greenbelt, Maryland
MMT Observatory, Mt. Hopkins, Arizona
TimeUT Azimuth Elevation
Sun: 2024 4 18 20 23.661571 67.957528
Obj: 2024 4 18 20 154.895067 -30.393784
the object visibility at MMT, Mt. Hopkins, Arizona
Hale Telescope, Palomar Mountain, California
TimeUT Azimuth Elevation
Sun: 2024 4 18 20 7.374217 67.700877
Obj: 2024 4 18 20 149.674188 -26.572835
the object visibility at Hale Telescope, Palomar Mt., California
Mauna Kea, Hawaii
TimeUT Azimuth Elevation
Sun: 2024 4 18 20 278.636284 54.546916
Obj: 2024 4 18 20 120.021597 -10.749198
the object visibility at Mauna Kea, Hawaii
Siding Spring Obs., Australia
TimeUT Azimuth Elevation
Sun: 2024 4 18 20 260.993971 -6.866935
Obj: 2024 4 18 20 128.368520 13.026467
the object visibility at Siding Spring Obs., Australia
Tokyo, Japan
TimeUT Azimuth Elevation
Sun: 2024 4 18 20 250.517239 -7.967225
Obj: 2024 4 18 20 83.344403 53.764095
the object visibility at Tokyo, Japan
William Herschel Telescope, La Palma, Canary Islands, Spain
TimeUT Azimuth Elevation
Sun: 2024 4 18 20 105.558830 -4.777690
Obj: 2024 4 18 20 239.544562 -5.190615
the object visibility at William Hershel Telescope, La Palma, Canary Islands, Spain
Gemini South, Cerro Pachon, Chile
TimeUT Azimuth Elevation
Sun: 2024 4 18 20 123.865522 27.364615
Obj: 2024 4 18 20 291.087742 -73.937851
the object visibility at Gemini South, Cerro Pachon, Chile
The data/results are in /local/data/bat1/prebascript/trigger1222885/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 Apr 18 16:54:03 EDT 2024