TDRSS lightcurve for Trigger=829046
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 13:20:12 UT
NOTICE_TYPE: Swift-BAT GRB Position
TRIGGER_NUM: 829046, Seg_Num: 0
GRB_RA: 57.459d {+03h 49m 50s} (J2000),
57.595d {+03h 50m 23s} (current),
57.086d {+03h 48m 21s} (1950)
GRB_DEC: -48.782d {-48d 46' 53"} (J2000),
-48.727d {-48d 43' 36"} (current),
-48.932d {-48d 55' 55"} (1950)
GRB_ERROR: 4.00 [arcmin radius, statistical only]
GRB_INTEN: 0 [cnts] Image_Peak=1003 [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: 47915.15 SOD {13:18:35.15} UT
GRB_PHI: 149.08 [deg]
GRB_THETA: 16.70 [deg]
SOLN_STATUS: 0x1099D
RATE_SIGNIF: 0.00 [sigma]
IMAGE_SIGNIF: 5.86 [sigma]
MERIT_PARAMS: +0 +0 +125 +6 +1 -5 +0 +0 -40 +1
SUN_POSTN: 33.95d {+02h 15m 47s} +13.61d {+13d 36' 29"}
SUN_DIST: 65.77 [deg] Sun_angle= -1.6 [hr] (East of Sun)
MOON_POSTN: 175.16d {+11h 40m 38s} +5.84d {+05d 50' 20"}
MOON_DIST: 112.34 [deg]
MOON_ILLUM: 87 [%]
GAL_COORDS: 257.49,-49.51 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS: 30.70,-65.66 [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 is a low-flux event whose position matches one of the nearby galaxy sources in the on-board catalog!
COMMENTS: This matches a source in the on-board catalog: Num=12251=I2000, delta=0.139 [deg].
COMMENTS: This matches a source in the ground catalog: I2000, delta=0.139 [deg].
COMMENTS: This is a GRB in nearby galaxy or it is noise.
COMMENTS: This trigger occurred at longitude,latitude = 12.44,-13.68 [deg].
GCN BAT Lightcurve Notice
TITLE: GCN/SWIFT NOTICE
NOTICE_DATE: Thu 26 Apr 18 13:35:43 UT
NOTICE_TYPE: Swift-BAT GRB Lightcurve
TRIGGER_NUM: 829046, Seg_Num: 0
GRB_RA: 57.459d {+03h 49m 50s} (J2000),
57.595d {+03h 50m 23s} (current),
57.086d {+03h 48m 21s} (1950)
GRB_DEC: -48.782d {-48d 46' 53"} (J2000),
-48.727d {-48d 43' 36"} (current),
-48.932d {-48d 55' 55"} (1950)
GRB_DATE: 18234 TJD; 116 DOY; 18/04/26
GRB_TIME: 47915.15 SOD {13:18:35.15} UT
TRIGGER_INDEX: 20000
GRB_PHI: 149.08 [deg]
GRB_THETA: 16.70 [deg]
DELTA_TIME: 0.00 [sec]
TRIGGER_DUR: 64.000 [sec]
SOLN_STATUS: 0x99D
RATE_SIGNIF: 0.00 [sigma]
IMAGE_SIGNIF: 5.86 [sigma]
LC_URL: sw00829046000msb.lc
GCN template for BAT paragraph
Click here!
At 13:18:35 UT, the Swift Burst Alert Telescope (BAT) triggered and
located GRB 180426 ***A*** (trigger=829046). Swift slewed immediately to the burst.
The BAT on-board calculated location is
RA, Dec 57.459, -48.782 which is
RA(J2000) = 03h 49m 50s
Dec(J2000) = -48d 46' 53"
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 ~1351 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
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: 73.728 s +/- 73.8417 s
Estimated T50 duration: 73.728 s +/- 73.8417 s
Estimated Peak Interval: MET 546441662.52800000 +/- 0.500000 s
Estimated background rate 1: 6167.409 near MET 546441557.568000 s
Estimated background rate 2: 6111.994 near MET 546441699.392000 s
Estimated total duration: 73.728 s (for data selection)
(from MET 546441603.136000 to MET 546441676.864000)
Estimated total fluence: -3024.553774 count
Created GTI with 4 entries
------------------------------------------
Search for this GRB position to the previously BAT detected GRB positions (search radius within 5 arcmin)
bat_grb_pos_cat.sh 57.459 -48.782 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 13 277.044414 30.276853
Obj: 2018 4 26 13 313.161928 -25.672189
the object visibility at GSFC, Greenbelt, Maryland
MMT Observatory, Mt. Hopkins, Arizona
TimeUT Azimuth Elevation
Sun: 2018 4 26 13 255.385000 2.232003
Obj: 2018 4 26 13 309.241119 -42.178776
the object visibility at MMT, Mt. Hopkins, Arizona
Hale Telescope, Palomar Mountain, California
TimeUT Azimuth Elevation
Sun: 2018 4 26 13 252.170095 -2.147746
Obj: 2018 4 26 13 307.841700 -47.160836
the object visibility at Hale Telescope, Palomar Mt., California
Mauna Kea, Hawaii
TimeUT Azimuth Elevation
Sun: 2018 4 26 13 232.482019 -38.691796
Obj: 2018 4 26 13 339.791111 -58.417662
the object visibility at Mauna Kea, Hawaii
Siding Spring Obs., Australia
TimeUT Azimuth Elevation
Sun: 2018 4 26 13 43.086402 -67.100177
Obj: 2018 4 26 13 24.856786 -2.582846
the object visibility at Siding Spring Obs., Australia
Tokyo, Japan
TimeUT Azimuth Elevation
Sun: 2018 4 26 13 141.535892 -32.944004
Obj: 2018 4 26 13 53.020709 -46.724462
the object visibility at Tokyo, Japan
William Herschel Telescope, La Palma, Canary Islands, Spain
TimeUT Azimuth Elevation
Sun: 2018 4 26 13 349.562151 74.622218
Obj: 2018 4 26 13 342.670045 8.942511
the object visibility at William Hershel Telescope, La Palma, Canary Islands, Spain
Gemini South, Cerro Pachon, Chile
TimeUT Azimuth Elevation
Sun: 2018 4 26 13 239.296774 20.516753
Obj: 2018 4 26 13 312.208883 28.815365
the object visibility at Gemini South, Cerro Pachon, Chile
The data/results are in /local/data/bat1/prebascript/trigger829046/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 09:36:02 EDT 2018