TDRSS lightcurve for Trigger=828953
Notes:
- 1) None of the TDRSS light curves are background subtracted.
GCN BAT Position Notice
TITLE: GCN/SWIFT NOTICE
NOTICE_DATE: Thu 26 Apr 18 05:57:02 UT
NOTICE_TYPE: Swift-BAT GRB Position
TRIGGER_NUM: 828953, Seg_Num: 0
GRB_RA: 245.197d {+16h 20m 47s} (J2000),
245.457d {+16h 21m 50s} (current),
244.486d {+16h 17m 57s} (1950)
GRB_DEC: -15.593d {-15d 35' 35"} (J2000),
-15.636d {-15d 38' 08"} (current),
-15.475d {-15d 28' 29"} (1950)
GRB_ERROR: 3.00 [arcmin radius, statistical only]
GRB_INTEN: 0 [cnts] Image_Peak=3675 [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: 18234 TJD; 116 DOY; 18/04/26
GRB_TIME: 21347.15 SOD {05:55:47.15} UT
GRB_PHI: -171.94 [deg]
GRB_THETA: 17.89 [deg]
SOLN_STATUS: 0x513
RATE_SIGNIF: 0.00 [sigma]
IMAGE_SIGNIF: 16.77 [sigma]
MERIT_PARAMS: +1 +0 +0 +6 +1 +5 +0 +0 +85 +0
SUN_POSTN: 33.66d {+02h 14m 37s} +13.51d {+13d 30' 32"}
SUN_DIST: 149.18 [deg] Sun_angle= 9.9 [hr] (West of Sun)
MOON_POSTN: 171.18d {+11h 24m 42s} +7.23d {+07d 14' 04"}
MOON_DIST: 77.01 [deg]
MOON_ILLUM: 84 [%]
GAL_COORDS: 359.28, 23.65 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS: 246.04, 5.81 [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 does not match any source in the on-board catalog.
COMMENTS: This matches a source in the ground catalog: Sco_X-1, delta=0.214 [deg].
COMMENTS: This is not a GRB.
COMMENTS: This trigger occurred at longitude,latitude = 311.74,10.69 [deg].
COMMENTS:
COMMENTS: This trigger occured while the StarTracker had lost lock, so it is possibly bogus.
GCN BAT Lightcurve Notice
TITLE: GCN/SWIFT NOTICE
NOTICE_DATE: Thu 26 Apr 18 06:12:59 UT
NOTICE_TYPE: Swift-BAT GRB Lightcurve
TRIGGER_NUM: 828953, Seg_Num: 0
GRB_RA: 245.197d {+16h 20m 47s} (J2000),
245.457d {+16h 21m 50s} (current),
244.486d {+16h 17m 57s} (1950)
GRB_DEC: -15.593d {-15d 35' 35"} (J2000),
-15.636d {-15d 38' 08"} (current),
-15.475d {-15d 28' 29"} (1950)
GRB_DATE: 18234 TJD; 116 DOY; 18/04/26
GRB_TIME: 21347.15 SOD {05:55:47.15} UT
TRIGGER_INDEX: 20000
GRB_PHI: -171.94 [deg]
GRB_THETA: 17.89 [deg]
DELTA_TIME: 0.00 [sec]
TRIGGER_DUR: 64.000 [sec]
SOLN_STATUS: 0x513
RATE_SIGNIF: 0.00 [sigma]
IMAGE_SIGNIF: 16.77 [sigma]
LC_URL: sw00828953000msb.lc
GCN template for BAT paragraph
Click here!
At 05:55:47 UT, the Swift Burst Alert Telescope (BAT) triggered and
located GRB 180426 ***A*** (trigger=828953). Swift slewed immediately to the burst.
The BAT on-board calculated location is
RA, Dec 245.197, -15.593 which is
RA(J2000) = 16h 20m 47s
Dec(J2000) = -15d 35' 35"
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 ~1318 counts/sec (15-350 keV), at ~171 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: 53.248 s +/- 45.2418 s
Estimated T50 duration: 53.248 s +/- 49.83 s
Estimated Peak Interval: MET 546415110.91199994 +/- 0.500000 s
Estimated background rate 1: 5579.648 near MET 546414999.808000 s
Estimated background rate 2: 6216.264 near MET 546415131.392000 s
Estimated total duration: 53.248 s (for data selection)
(from MET 546415055.616000 to MET 546415108.864000)
Estimated total fluence: -3253.117715 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 245.197 -15.593 0.083
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: 2018 4 26 6 195.888197 -36.090184
Obj: 2018 4 26 6 338.559675 32.617367
the object visibility at GSFC, Greenbelt, Maryland
MMT Observatory, Mt. Hopkins, Arizona
TimeUT Azimuth Elevation
Sun: 2018 4 26 6 152.904428 -40.602611
Obj: 2018 4 26 6 305.017500 20.802237
the object visibility at MMT, Mt. Hopkins, Arizona
Hale Telescope, Palomar Mountain, California
TimeUT Azimuth Elevation
Sun: 2018 4 26 6 146.867551 -36.630377
Obj: 2018 4 26 6 301.346693 15.667530
the object visibility at Hale Telescope, Palomar Mt., California
Mauna Kea, Hawaii
TimeUT Azimuth Elevation
Sun: 2018 4 26 6 111.989782 -17.554467
Obj: 2018 4 26 6 282.537105 -11.885088
the object visibility at Mauna Kea, Hawaii
Siding Spring Obs., Australia
TimeUT Azimuth Elevation
Sun: 2018 4 26 6 118.816595 17.737853
Obj: 2018 4 26 6 326.779463 -36.275862
the object visibility at Siding Spring Obs., Australia
Tokyo, Japan
TimeUT Azimuth Elevation
Sun: 2018 4 26 6 72.090722 46.329511
Obj: 2018 4 26 6 209.780313 -68.925492
the object visibility at Tokyo, Japan
William Herschel Telescope, La Palma, Canary Islands, Spain
TimeUT Azimuth Elevation
Sun: 2018 4 26 6 249.380904 -8.591111
Obj: 2018 4 26 6 46.623492 30.876781
the object visibility at William Hershel Telescope, La Palma, Canary Islands, Spain
Gemini South, Cerro Pachon, Chile
TimeUT Azimuth Elevation
Sun: 2018 4 26 6 309.579745 -65.691721
Obj: 2018 4 26 6 221.290312 71.216113
the object visibility at Gemini South, Cerro Pachon, Chile
The data/results are in /local/data/bat1/prebascript/trigger828953/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 26 02:13:42 EDT 2018