TDRSS lightcurve for Trigger=1441823
Notes:
- 1) None of the TDRSS light curves are background subtracted.
GCN BAT Position Notice
TITLE: GCN/SWIFT NOTICE
NOTICE_DATE: Sat 17 Jan 26 06:30:15 UT
NOTICE_TYPE: Swift-BAT GRB Position
TRIGGER_NUM: 1441823, Seg_Num: 0
GRB_RA: 170.183d {+11h 20m 44s} (J2000),
170.471d {+11h 21m 53s} (current),
169.634d {+11h 18m 32s} (1950)
GRB_DEC: -61.905d {-61d 54' 17"} (J2000),
-62.048d {-62d 02' 51"} (current),
-61.631d {-61d 37' 50"} (1950)
GRB_ERROR: 3.00 [arcmin radius, statistical only]
GRB_INTEN: 0 [cnts] Image_Peak=2237 [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: 21057 TJD; 17 DOY; 26/01/17
GRB_TIME: 23338.94 SOD {06:28:58.94} UT
GRB_PHI: 99.41 [deg]
GRB_THETA: 11.35 [deg]
SOLN_STATUS: 0x11D
RATE_SIGNIF: 0.00 [sigma]
IMAGE_SIGNIF: 9.75 [sigma]
MERIT_PARAMS: +0 +0 +123 +6 +1 +0 +0 +1 -3 +0
SUN_POSTN: 299.20d {+19h 56m 48s} -20.73d {-20d 43' 32"}
SUN_DIST: 87.80 [deg] Sun_angle= 8.6 [hr] (West of Sun)
MOON_POSTN: 280.71d {+18h 42m 50s} -27.58d {-27d 34' 42"}
MOON_DIST: 74.62 [deg]
MOON_ILLUM: 2 [%]
GAL_COORDS: 292.47, -0.89 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS: 210.86,-57.28 [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=10689=1A1118-61, delta=0.029 [deg].
COMMENTS: This matches a source in the ground catalog: 1A1118-61, delta=0.029 [deg].
COMMENTS: This is not a GRB.
COMMENTS: This is an interesting source.
COMMENTS: This trigger occurred at longitude,latitude = 348.90,-16.64 [deg].
GCN BAT Lightcurve Notice
TITLE: GCN/SWIFT NOTICE
NOTICE_DATE: Sat 17 Jan 26 06:51:00 UT
NOTICE_TYPE: Swift-BAT GRB Lightcurve
TRIGGER_NUM: 1441823, Seg_Num: 0
GRB_RA: 170.183d {+11h 20m 44s} (J2000),
170.471d {+11h 21m 53s} (current),
169.634d {+11h 18m 32s} (1950)
GRB_DEC: -61.905d {-61d 54' 17"} (J2000),
-62.048d {-62d 02' 51"} (current),
-61.631d {-61d 37' 50"} (1950)
GRB_DATE: 21057 TJD; 17 DOY; 26/01/17
GRB_TIME: 23338.94 SOD {06:28:58.94} UT
TRIGGER_INDEX: 20000
GRB_PHI: 99.41 [deg]
GRB_THETA: 11.35 [deg]
DELTA_TIME: 0.00 [sec]
TRIGGER_DUR: 64.000 [sec]
SOLN_STATUS: 0x11D
RATE_SIGNIF: 0.00 [sigma]
IMAGE_SIGNIF: 9.75 [sigma]
LC_URL: sw01441823000msb.lc
GCN template for BAT paragraph
Click here!
At 06:28:58 UT, the Swift Burst Alert Telescope (BAT) triggered and
located GRB 260117 ***A*** (trigger=1441823). Swift slewed immediately to the burst.
The BAT on-board calculated location is
RA, Dec 170.183, -61.905 which is
RA(J2000) = 11h 20m 44s
Dec(J2000) = -61d 54' 17"
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 ~1498 counts/sec (15-350 keV), at ~3 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
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: 113.408 s +/- 13.8253 s
Estimated T50 duration: 113.408 s +/- 50.1822 s
Estimated Peak Interval: MET 790324194.88000000 +/- 0.500000 s
Estimated background rate 1: 5399.212 near MET 790324167.488000 s
Estimated background rate 2: 4625.336 near MET 790324329.152000 s
Estimated total duration: 113.408 s (for data selection)
(from MET 790324182.976000 to MET 790324296.384000)
Estimated total fluence: -21289.145773 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 170.183 -61.905 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 170.183 -61.905
1A 1118-61 33719 170.238 -61.917 0.028539682909092156
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: 2026 1 17 6 208.361645 -69.783301
Obj: 2026 1 17 6 341.240782 -16.399388
the object visibility at GSFC, Greenbelt, Maryland
MMT Observatory, Mt. Hopkins, Arizona
TimeUT Azimuth Elevation
Sun: 2026 1 17 6 111.330127 -66.029380
Obj: 2026 1 17 6 330.917665 -21.250999
the object visibility at MMT, Mt. Hopkins, Arizona
Hale Telescope, Palomar Mountain, California
TimeUT Azimuth Elevation
Sun: 2026 1 17 6 107.864749 -60.721398
Obj: 2026 1 17 6 329.217300 -25.211768
the object visibility at Hale Telescope, Palomar Mt., California
Mauna Kea, Hawaii
TimeUT Azimuth Elevation
Sun: 2026 1 17 6 76.017979 -26.330202
Obj: 2026 1 17 6 331.580288 -31.266284
the object visibility at Mauna Kea, Hawaii
Siding Spring Obs., Australia
TimeUT Azimuth Elevation
Sun: 2026 1 17 6 87.676870 39.024712
Obj: 2026 1 17 6 357.757451 3.377737
the object visibility at Siding Spring Obs., Australia
Tokyo, Japan
TimeUT Azimuth Elevation
Sun: 2026 1 17 6 40.320281 23.280980
Obj: 2026 1 17 6 11.570470 -61.373787
the object visibility at Tokyo, Japan
William Herschel Telescope, La Palma, Canary Islands, Spain
TimeUT Azimuth Elevation
Sun: 2026 1 17 6 279.744942 -27.587978
Obj: 2026 1 17 6 8.256539 -1.968509
the object visibility at William Hershel Telescope, La Palma, Canary Islands, Spain
Gemini South, Cerro Pachon, Chile
TimeUT Azimuth Elevation
Sun: 2026 1 17 6 341.238684 -36.683827
Obj: 2026 1 17 6 334.564654 50.913162
the object visibility at Gemini South, Cerro Pachon, Chile
The data/results are in /local/data/bat1/prebascript/trigger1441823/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 Jan 17 01:51:44 EST 2026