TDRSS lightcurve for Trigger=1500287
Notes:
- 1) None of the TDRSS light curves are background subtracted.
GCN BAT Position Notice
TITLE: GCN/SWIFT NOTICE
NOTICE_DATE: Fri 13 Mar 26 11:11:05 UT
NOTICE_TYPE: Swift-BAT GRB Position
TRIGGER_NUM: 1500287, Seg_Num: 0
GRB_RA: 352.883d {+23h 31m 32s} (J2000),
353.219d {+23h 32m 53s} (current),
352.240d {+23h 28m 58s} (1950)
GRB_DEC: -2.989d {-02d 59' 19"} (J2000),
-2.844d {-02d 50' 38"} (current),
-3.265d {-03d 15' 53"} (1950)
GRB_ERROR: 3.00 [arcmin radius, statistical only]
GRB_INTEN: 0 [cnts] Image_Peak=2421 [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: 21112 TJD; 72 DOY; 26/03/13
GRB_TIME: 40186.62 SOD {11:09:46.62} UT
GRB_PHI: -149.30 [deg]
GRB_THETA: 47.36 [deg]
SOLN_STATUS: 0x13
RATE_SIGNIF: 0.00 [sigma]
IMAGE_SIGNIF: 11.25 [sigma]
MERIT_PARAMS: +1 +0 +0 +6 +1 +1 -100 +0 -99 +0
SUN_POSTN: 353.47d {+23h 33m 52s} -2.82d {-02d 49' 21"}
SUN_DIST: 0.25 [deg] Sun_angle= 0.0 [hr] (West of Sun)
MOON_POSTN: 287.39d {+19h 09m 33s} -26.77d {-26d 46' 00"}
MOON_DIST: 67.21 [deg]
MOON_ILLUM: 31 [%]
GAL_COORDS: 81.13,-59.21 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS: 352.28, 0.08 [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 does not match any source in the ground catalog.
COMMENTS: This is a GRB.
COMMENTS: This trigger occurred at longitude,latitude = 324.47,19.79 [deg].
GCN BAT Lightcurve Notice
TITLE: GCN/SWIFT NOTICE
NOTICE_DATE: Fri 13 Mar 26 11:38:36 UT
NOTICE_TYPE: Swift-BAT GRB Lightcurve
TRIGGER_NUM: 1500287, Seg_Num: 0
GRB_RA: 352.883d {+23h 31m 32s} (J2000),
353.219d {+23h 32m 53s} (current),
352.240d {+23h 28m 58s} (1950)
GRB_DEC: -2.989d {-02d 59' 19"} (J2000),
-2.844d {-02d 50' 38"} (current),
-3.265d {-03d 15' 53"} (1950)
GRB_DATE: 21112 TJD; 72 DOY; 26/03/13
GRB_TIME: 40186.62 SOD {11:09:46.62} UT
TRIGGER_INDEX: 20000
GRB_PHI: -149.30 [deg]
GRB_THETA: 47.36 [deg]
DELTA_TIME: 0.00 [sec]
TRIGGER_DUR: 64.000 [sec]
SOLN_STATUS: 0x13
RATE_SIGNIF: 0.00 [sigma]
IMAGE_SIGNIF: 11.25 [sigma]
LC_URL: sw01500287000msb.lc
GCN template for BAT paragraph
Click here!
At 11:09:46 UT, the Swift Burst Alert Telescope (BAT) triggered and
located GRB 260313 ***A*** (trigger=1500287). Swift slewed immediately to the burst.
The BAT on-board calculated location is
RA, Dec 352.883, -2.989 which is
RA(J2000) = 23h 31m 32s
Dec(J2000) = -02d 59' 19"
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 ~1046 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
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: 127.744 s +/- 122.003 s
Estimated T50 duration: 127.744 s +/- 122.003 s
Estimated Peak Interval: MET 795093064.51199996 +/- 0.500000 s
Estimated background rate 1: 3606.374 near MET 795093022.656000 s
Estimated background rate 2: 3683.892 near MET 795093191.488000 s
Estimated total duration: 127.744 s (for data selection)
(from MET 795093045.312000 to MET 795093173.056000)
Estimated total fluence: -1531.138410 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 352.883 -2.989 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 352.883 -2.989
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: 2026 3 13 11 269.207689 -5.503704
Obj: 2026 3 13 11 269.379374 -5.324239
the object visibility at GSFC, Greenbelt, Maryland
MMT Observatory, Mt. Hopkins, Arizona
TimeUT Azimuth Elevation
Sun: 2026 3 13 11 249.809067 -33.937662
Obj: 2026 3 13 11 250.006882 -33.752211
the object visibility at MMT, Mt. Hopkins, Arizona
Hale Telescope, Palomar Mountain, California
TimeUT Azimuth Elevation
Sun: 2026 3 13 11 244.047797 -37.927165
Obj: 2026 3 13 11 244.272920 -37.754614
the object visibility at Hale Telescope, Palomar Mt., California
Mauna Kea, Hawaii
TimeUT Azimuth Elevation
Sun: 2026 3 13 11 201.774946 -71.797004
Obj: 2026 3 13 11 202.535300 -71.728216
the object visibility at Mauna Kea, Hawaii
Siding Spring Obs., Australia
TimeUT Azimuth Elevation
Sun: 2026 3 13 11 62.948689 -32.485793
Obj: 2026 3 13 11 62.740428 -32.660679
the object visibility at Siding Spring Obs., Australia
Tokyo, Japan
TimeUT Azimuth Elevation
Sun: 2026 3 13 11 102.064221 -21.790799
Obj: 2026 3 13 11 102.203572 -22.002179
the object visibility at Tokyo, Japan
William Herschel Telescope, La Palma, Canary Islands, Spain
TimeUT Azimuth Elevation
Sun: 2026 3 13 11 306.583511 43.362350
Obj: 2026 3 13 11 306.844967 43.521865
the object visibility at William Hershel Telescope, La Palma, Canary Islands, Spain
Gemini South, Cerro Pachon, Chile
TimeUT Azimuth Elevation
Sun: 2026 3 13 11 271.858192 2.381338
Obj: 2026 3 13 11 271.751058 2.604892
the object visibility at Gemini South, Cerro Pachon, Chile
The data/results are in /local/data/bat1/prebascript/trigger1500287/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:
Fri Mar 13 07:40:05 EDT 2026