- GCN/BACODINE POSITION NOTICE
TITLE: GCN/SWIFT NOTICE
NOTICE_DATE: Tue 02 May 06 17:24:54 UT
NOTICE_TYPE: Swift-BAT GRB Position
TRIGGER_NUM: 208275, Seg_Num: 0
GRB_RA: 278.936d {+18h 35m 45s} (J2000),
278.971d {+18h 35m 53s} (current),
278.655d {+18h 34m 37s} (1950)
GRB_DEC: +52.632d {+52d 37' 56"} (J2000),
+52.638d {+52d 38' 15"} (current),
+52.590d {+52d 35' 22"} (1950)
GRB_ERROR: 3.00 [arcmin radius, statistical only]
GRB_INTEN: 838 [cnts] Image_Peak=123 [image_cnts]
TRIGGER_DUR: 0.064 [sec]
TRIGGER_INDEX: 10418 E_range: 25-100 keV
BKG_INTEN: 33731 [cnts]
BKG_TIME: 62670.83 SOD {17:24:30.83} UT
BKG_DUR: 8 [sec]
GRB_DATE: 13857 TJD; 122 DOY; 06/05/02
GRB_TIME: 62681.07 SOD {17:24:41.07} UT
GRB_PHI: -2.25 [deg]
GRB_THETA: 23.15 [deg]
SOLN_STATUS: 0x3
RATE_SIGNIF: 32.96 [sigma]
IMAGE_SIGNIF: 11.47 [sigma]
MERIT_PARAMS: +1 +0 +0 -4 +2 +11 +0 +0 +8 +1
SUN_POSTN: 39.72d {+02h 38m 54s} +15.49d {+15d 29' 12"}
SUN_DIST: 94.98 [deg] Sun_angle= 8.1 [hr] (West of Sun)
MOON_POSTN: 105.96d {+07h 03m 50s} +27.77d {+27d 46' 23"}
MOON_DIST: 99.36 [deg]
MOON_ILLUM: 27 [%]
GAL_COORDS: 81.60, 23.54 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS: 291.95, 75.39 [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 = 133.62,14.53 [deg].
- red DSS finding chart
ps-file
- GCN NOTICE
TITLE: GCN/SWIFT NOTICE
NOTICE_DATE: Tue 02 May 06 17:26:00 UT
NOTICE_TYPE: Swift-XRT Nack-Position
TRIGGER_NUM: 208275, Seg_Num: 0
POINT_RA: 278.919d {+18h 35m 40s} (J2000)
POINT_DEC: +52.621d {+52d 37' 15"} (J2000)
IMG_START_DATE: 13857 TJD; 122 DOY; 06/05/02
IMG_START_TIME: 62751.34 SOD {17:25:51.34} UT, 70.3 [sec] since BAT Trigger Time
COUNTS: 1 Min_needed= 20
STD_DEV: 0.00 Max_StdDev_for_Good=28.44 [arcsec]
PH2_ITER: 0 Max_iter_allowed= 4
ERROR_CODE: 1
COMMENTS: SWIFT-XRT Nack Position.
COMMENTS: No source found in the image.
- GCN NOTICE
TITLE: GCN/SWIFT NOTICE
NOTICE_DATE: Tue 02 May 06 17:28:29 UT
NOTICE_TYPE: Swift-UVOT Source List
TRIGGER_NUM: 208275, Seg_Num: 0
POINT_RA: 278.919d {+18h 35m 40s} (J2000)
POINT_DEC: +52.621d {+52d 37' 14"} (J2000)
POINT_ROLL: 56.189d
IMG_START_DATE: 13857 TJD; 122 DOY; 06/05/02
IMG_START_TIME: 62755.29 SOD {17:25:55.29} UT, 74.2 [sec] since BAT Trigger Time
FILTER: 10, White
BKG_MEAN: 1.086
N_STARS: 89
X_OFFSET: 566 [pixels]
Y_OFFSET: 500 [pixels]
X_MAX: 1525 [pixels]
Y_MAX: 1459 [pixels]
DET_THRESH: 9
PHOTO_THRESH: 4
SL_URL: sw00208275000msufc0074.fits
SUN_POSTN: 39.73d {+02h 38m 55s} +15.49d {+15d 29' 15"}
SUN_DIST: 95.00 [deg] Sun_angle= 8.1 [hr] (West of Sun)
MOON_POSTN: 105.99d {+07h 03m 58s} +27.77d {+27d 46' 09"}
MOON_DIST: 99.37 [deg]
MOON_ILLUM: 27 [%]
GAL_COORDS: 81.58, 23.55 [deg] galactic lon,lat of the pointing direction
ECL_COORDS: 291.90, 75.38 [deg] ecliptic lon,lat of the pointing direction
COMMENTS: SWIFT-UVOT Source List.
- GCN NOTICE
TITLE: GCN/SWIFT NOTICE
NOTICE_DATE: Tue 02 May 06 17:29:16 UT
NOTICE_TYPE: Swift-UVOT Image
TRIGGER_NUM: 208275, Seg_Num: 0
POINT_RA: 278.919d {+18h 35m 40s} (J2000)
POINT_DEC: +52.621d {+52d 37' 14"} (J2000)
ROLL: 56.189d
IMG_START_DATE: 13857 TJD; 122 DOY; 06/05/02
IMG_START_TIME: 62755.29 SOD {17:25:55.29} UT, 74.2 [sec] since BAT Trigger Time
FILTER: 10, White
EXPOSURE_ID: 168283556
X_OFFSET: 886 [pixels]
Y_OFFSET: 820 [pixels]
WIDTH: 160 [pixels]
HEIGHT: 160 [pixels]
X_GRB_POS: 1046
Y_GRB_POS: 980
BINNING_INDEX: 1
IM_URL: sw00208275000msuni0074.fits
SUN_POSTN: 39.73d {+02h 38m 55s} +15.49d {+15d 29' 16"}
SUN_DIST: 95.00 [deg] Sun_angle= 8.1 [hr] (West of Sun)
MOON_POSTN: 106.00d {+07h 04m 00s} +27.77d {+27d 46' 06"}
MOON_DIST: 99.37 [deg]
MOON_ILLUM: 27 [%]
GAL_COORDS: 81.58, 23.55 [deg] galactic lon,lat of the pointing direction
ECL_COORDS: 291.90, 75.38 [deg] ecliptic lon,lat of the pointing direction
COMMENTS: SWIFT-UVOT Image.
COMMENTS: The GRB Position came from the Window Position in the Mode Command.
COMMENTS: The image has 2x2 binning (compression).
- GCN NOTICE
TITLE: GCN/SWIFT NOTICE
NOTICE_DATE: Tue 02 May 06 17:29:29 UT
NOTICE_TYPE: Swift-BAT GRB Lightcurve
TRIGGER_NUM: 208275, Seg_Num: 0
GRB_RA: 278.936d {+18h 35m 45s} (J2000),
278.971d {+18h 35m 53s} (current),
278.655d {+18h 34m 37s} (1950)
GRB_DEC: +52.632d {+52d 37' 56"} (J2000),
+52.638d {+52d 38' 15"} (current),
+52.590d {+52d 35' 22"} (1950)
GRB_DATE: 13857 TJD; 122 DOY; 06/05/02
GRB_TIME: 62681.03 SOD {17:24:41.03} UT
TRIGGER_INDEX: 10418
GRB_PHI: -2.25 [deg]
GRB_THETA: 23.15 [deg]
DELTA_TIME: -60.00 [sec]
TRIGGER_DUR: 0.064 [sec]
SOLN_STATUS: 0x3
RATE_SIGNIF: 32.96 [sigma]
IMAGE_SIGNIF: 11.47 [sigma]
LC_URL: sw00208275000msb.lc
SUN_POSTN: 39.73d {+02h 38m 55s} +15.49d {+15d 29' 16"}
SUN_DIST: 94.98 [deg] Sun_angle= 8.1 [hr] (West of Sun)
MOON_POSTN: 106.00d {+07h 04m 01s} +27.77d {+27d 46' 05"}
MOON_DIST: 99.36 [deg]
MOON_ILLUM: 27 [%]
GAL_COORDS: 81.60, 23.54 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS: 291.95, 75.39 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS: SWIFT-BAT GRB Lightcurve.
COMMENTS:
COMMENTS: The next comments were copied from the BAT_POS Notice:
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 = 133.62,14.53 [deg].
- GCN NOTICE
TITLE: GCN/SWIFT NOTICE
NOTICE_DATE: Tue 02 May 06 17:35:29 UT
NOTICE_TYPE: Swift-UVOT Source List
TRIGGER_NUM: 208275, Seg_Num: 0
POINT_RA: 278.916d {+18h 35m 40s} (J2000)
POINT_DEC: +52.623d {+52d 37' 25"} (J2000)
POINT_ROLL: 56.187d
IMG_START_DATE: 13857 TJD; 122 DOY; 06/05/02
IMG_START_TIME: 62860.54 SOD {17:27:40.54} UT, 179.5 [sec] since BAT Trigger Time
FILTER: 3, V
BKG_MEAN: 1.038
N_STARS: 144
X_OFFSET: 566 [pixels]
Y_OFFSET: 500 [pixels]
X_MAX: 1525 [pixels]
Y_MAX: 1459 [pixels]
DET_THRESH: 9
PHOTO_THRESH: 4
SL_URL: sw00208275000msufc0179.fits
SUN_POSTN: 39.73d {+02h 38m 56s} +15.49d {+15d 29' 20"}
SUN_DIST: 95.00 [deg] Sun_angle= 8.1 [hr] (West of Sun)
MOON_POSTN: 106.06d {+07h 04m 15s} +27.76d {+27d 45' 41"}
MOON_DIST: 99.37 [deg]
MOON_ILLUM: 27 [%]
GAL_COORDS: 81.58, 23.55 [deg] galactic lon,lat of the pointing direction
ECL_COORDS: 291.89, 75.38 [deg] ecliptic lon,lat of the pointing direction
COMMENTS: SWIFT-UVOT Source List.
- GCN NOTICE
TITLE: GCN/SWIFT NOTICE
NOTICE_DATE: Tue 02 May 06 17:36:39 UT
NOTICE_TYPE: Swift-UVOT Image
TRIGGER_NUM: 208275, Seg_Num: 0
POINT_RA: 278.916d {+18h 35m 40s} (J2000)
POINT_DEC: +52.623d {+52d 37' 25"} (J2000)
ROLL: 56.187d
IMG_START_DATE: 13857 TJD; 122 DOY; 06/05/02
IMG_START_TIME: 62860.54 SOD {17:27:40.54} UT, 179.5 [sec] since BAT Trigger Time
FILTER: 3, V
EXPOSURE_ID: 168283661
X_OFFSET: 886 [pixels]
Y_OFFSET: 820 [pixels]
WIDTH: 160 [pixels]
HEIGHT: 160 [pixels]
X_GRB_POS: 1046
Y_GRB_POS: 980
BINNING_INDEX: 1
IM_URL: sw00208275000msuni0179.fits
SUN_POSTN: 39.73d {+02h 38m 56s} +15.49d {+15d 29' 21"}
SUN_DIST: 95.00 [deg] Sun_angle= 8.1 [hr] (West of Sun)
MOON_POSTN: 106.07d {+07h 04m 18s} +27.76d {+27d 45' 37"}
MOON_DIST: 99.37 [deg]
MOON_ILLUM: 27 [%]
GAL_COORDS: 81.58, 23.55 [deg] galactic lon,lat of the pointing direction
ECL_COORDS: 291.89, 75.38 [deg] ecliptic lon,lat of the pointing direction
COMMENTS: SWIFT-UVOT Image.
COMMENTS: The GRB Position came from the Window Position in the Mode Command.
COMMENTS: The image has 2x2 binning (compression).
- GCN NOTICE
TITLE: GCN/SWIFT NOTICE
NOTICE_DATE: Tue 02 May 06 17:46:05 UT
NOTICE_TYPE: Swift-UVOT Source List
TRIGGER_NUM: 208275, Seg_Num: 0
POINT_RA: 278.916d {+18h 35m 40s} (J2000)
POINT_DEC: +52.624d {+52d 37' 25"} (J2000)
POINT_ROLL: 56.187d
IMG_START_DATE: 13857 TJD; 122 DOY; 06/05/02
IMG_START_TIME: 63538.43 SOD {17:38:58.43} UT, 857.4 [sec] since BAT Trigger Time
FILTER: 3, V
BKG_MEAN: 1.514
N_STARS: 152
X_OFFSET: 566 [pixels]
Y_OFFSET: 500 [pixels]
X_MAX: 1525 [pixels]
Y_MAX: 1459 [pixels]
DET_THRESH: 10
PHOTO_THRESH: 5
SL_URL: sw00208275000msufc0857.fits
SUN_POSTN: 39.74d {+02h 38m 57s} +15.49d {+15d 29' 28"}
SUN_DIST: 95.00 [deg] Sun_angle= 8.1 [hr] (West of Sun)
MOON_POSTN: 106.17d {+07h 04m 40s} +27.75d {+27d 44' 59"}
MOON_DIST: 99.37 [deg]
MOON_ILLUM: 27 [%]
GAL_COORDS: 81.58, 23.55 [deg] galactic lon,lat of the pointing direction
ECL_COORDS: 291.89, 75.38 [deg] ecliptic lon,lat of the pointing direction
COMMENTS: SWIFT-UVOT Source List.
- GCN NOTICE
TITLE: GCN/SWIFT NOTICE
NOTICE_DATE: Tue 02 May 06 17:47:18 UT
NOTICE_TYPE: Swift-UVOT Image
TRIGGER_NUM: 208275, Seg_Num: 0
POINT_RA: 278.916d {+18h 35m 40s} (J2000)
POINT_DEC: +52.624d {+52d 37' 25"} (J2000)
ROLL: 56.187d
IMG_START_DATE: 13857 TJD; 122 DOY; 06/05/02
IMG_START_TIME: 63538.43 SOD {17:38:58.43} UT, 857.4 [sec] since BAT Trigger Time
FILTER: 3, V
EXPOSURE_ID: 168284339
X_OFFSET: 886 [pixels]
Y_OFFSET: 820 [pixels]
WIDTH: 160 [pixels]
HEIGHT: 160 [pixels]
X_GRB_POS: 1046
Y_GRB_POS: 980
BINNING_INDEX: 1
IM_URL: sw00208275000msuni0857.fits
SUN_POSTN: 39.74d {+02h 38m 58s} +15.49d {+15d 29' 29"}
SUN_DIST: 95.00 [deg] Sun_angle= 8.1 [hr] (West of Sun)
MOON_POSTN: 106.18d {+07h 04m 43s} +27.75d {+27d 44' 54"}
MOON_DIST: 99.37 [deg]
MOON_ILLUM: 27 [%]
GAL_COORDS: 81.58, 23.55 [deg] galactic lon,lat of the pointing direction
ECL_COORDS: 291.89, 75.38 [deg] ecliptic lon,lat of the pointing direction
COMMENTS: SWIFT-UVOT Image.
COMMENTS: The GRB Position came from the Window Position in the Mode Command.
COMMENTS: The image has 2x2 binning (compression).
- GCN NOTICE
TITLE: GCN/SWIFT NOTICE
NOTICE_DATE: Tue 02 May 06 17:47:59 UT
NOTICE_TYPE: Swift-UVOT Source List
TRIGGER_NUM: 208275, Seg_Num: 0
POINT_RA: 278.916d {+18h 35m 40s} (J2000)
POINT_DEC: +52.623d {+52d 37' 24"} (J2000)
POINT_ROLL: 56.187d
IMG_START_DATE: 13857 TJD; 122 DOY; 06/05/02
IMG_START_TIME: 63946.08 SOD {17:45:46.08} UT, 1265.0 [sec] since BAT Trigger Time
FILTER: 10, White
BKG_MEAN: 2.855
N_STARS: 77
X_OFFSET: 566 [pixels]
Y_OFFSET: 500 [pixels]
X_MAX: 1525 [pixels]
Y_MAX: 1459 [pixels]
DET_THRESH: 14
PHOTO_THRESH: 7
SL_URL: sw00208275000msufc1265.fits
SUN_POSTN: 39.74d {+02h 38m 58s} +15.49d {+15d 29' 30"}
SUN_DIST: 95.00 [deg] Sun_angle= 8.1 [hr] (West of Sun)
MOON_POSTN: 106.18d {+07h 04m 44s} +27.75d {+27d 44' 51"}
MOON_DIST: 99.38 [deg]
MOON_ILLUM: 27 [%]
GAL_COORDS: 81.58, 23.55 [deg] galactic lon,lat of the pointing direction
ECL_COORDS: 291.89, 75.38 [deg] ecliptic lon,lat of the pointing direction
COMMENTS: SWIFT-UVOT Source List.
- GCN NOTICE
TITLE: GCN/SWIFT NOTICE
NOTICE_DATE: Tue 02 May 06 17:49:30 UT
NOTICE_TYPE: Swift-UVOT Image
TRIGGER_NUM: 208275, Seg_Num: 0
POINT_RA: 278.916d {+18h 35m 40s} (J2000)
POINT_DEC: +52.623d {+52d 37' 24"} (J2000)
ROLL: 56.187d
IMG_START_DATE: 13857 TJD; 122 DOY; 06/05/02
IMG_START_TIME: 63946.08 SOD {17:45:46.08} UT, 1265.0 [sec] since BAT Trigger Time
FILTER: 10, White
EXPOSURE_ID: 168284747
X_OFFSET: 886 [pixels]
Y_OFFSET: 820 [pixels]
WIDTH: 160 [pixels]
HEIGHT: 160 [pixels]
X_GRB_POS: 1046
Y_GRB_POS: 980
BINNING_INDEX: 1
IM_URL: sw00208275000msuni1265.fits
SUN_POSTN: 39.74d {+02h 38m 58s} +15.49d {+15d 29' 31"}
SUN_DIST: 95.00 [deg] Sun_angle= 8.1 [hr] (West of Sun)
MOON_POSTN: 106.20d {+07h 04m 48s} +27.75d {+27d 44' 45"}
MOON_DIST: 99.38 [deg]
MOON_ILLUM: 27 [%]
GAL_COORDS: 81.58, 23.55 [deg] galactic lon,lat of the pointing direction
ECL_COORDS: 291.89, 75.38 [deg] ecliptic lon,lat of the pointing direction
COMMENTS: SWIFT-UVOT Image.
COMMENTS: The GRB Position came from the Window Position in the Mode Command.
COMMENTS: The image has 2x2 binning (compression).
- GCN NOTICE
TITLE: GCN/SWIFT NOTICE
NOTICE_DATE: Tue 02 May 06 18:02:32 UT
NOTICE_TYPE: Swift-XRT Position
TRIGGER_NUM: 208275, Seg_Num: 0
GRB_RA: 278.9411d {+18h 35m 45.8s} (J2000),
278.9766d {+18h 35m 54.3s} (current),
278.6605d {+18h 34m 38.5s} (1950)
GRB_DEC: +52.6272d {+52d 37' 37.9"} (J2000),
+52.6327d {+52d 37' 57.6"} (current),
+52.5846d {+52d 35' 04.5"} (1950)
GRB_ERROR: 9.7 [arcsec radius, statistical plus systematic, 90% containment]
GRB_INTEN: 1.40e-11 [erg/cm2/sec]
GRB_SIGNIF: 5.00 [sigma]
IMG_START_DATE: 13857 TJD; 122 DOY; 06/05/02
IMG_START_TIME: 62754.02 SOD {17:25:54.02} UT, 72.9 [sec] since BAT Trigger Time
TAM[0-3]: 327.61 237.19 261.35 242.66
AMPLIFIER: 2
WAVEFORM: 134
SUN_POSTN: 39.75d {+02h 38m 60s} +15.49d {+15d 29' 40"}
SUN_DIST: 94.99 [deg] Sun_angle= 8.1 [hr] (West of Sun)
MOON_POSTN: 106.33d {+07h 05m 18s} +27.73d {+27d 43' 53"}
MOON_DIST: 99.38 [deg]
MOON_ILLUM: 27 [%]
GAL_COORDS: 81.59, 23.53 [deg] galactic lon,lat of the burst
ECL_COORDS: 291.95, 75.38 [deg] ecliptic lon,lat of the burst
COMMENTS: SWIFT-XRT Coordinates.
COMMENTS: This Notice was ground-generated -- not flight-generated.
COMMENTS: TAM values are not valid.
- GCN Circular #5055
E. Troja (INAF-IASFPA), S. D. Barthelmy (GSFC),
P. T. Boyd (NASA/GSFC), D. N. Burrows (PSU),
J. R. Cummings (NASA/ORAU), N. Gehrels (NASA/GSFC),
S. T. Holland (GSFC/USRA), S. D. Hunsberger (PSU),
J. A. Kennea (PSU), H. A. Krimm (GSFC/USRA),
V. La Parola (INAF-IASFPA), V. Mangano (INAF-IASFPA),
F. E. Marshall (NASA/GSFC), P. T. O'Brien (U Leicester),
K. L. Page (U Leicester), D. M. Palmer (LANL),
T. Sakamoto (NASA/ORAU), G. Tagliaferri (INAF-OAB) and
D. E. Vanden Berk (PSU) report on behalf of the Swift Team:
At 17:24:41 UT, the Swift Burst Alert Telescope (BAT) triggered and
located the short GRB 060502B (trigger=208275). Swift slewed immediately
to the burst. The BAT on-board calculated location is
RA,Dec 278.936, +52.632 {18h 35m 45s, +52d 37' 56"} (J2000)
with an uncertainty of 3 arcmin (radius, 90% containment, including
systematic uncertainty). The TDRSS BAT light curve shows a single spike
with a FWHM of less than 128 msec. The peak count rate
was ~10000 counts/sec (15-350 keV), at ~0 sec after the trigger.
The XRT began taking data at 17:25:51 UT, 70 seconds after the BAT
trigger. The XRT on-board centroid algorithm did not find a source in
the image, however analysis of downlinked data reveals a faint point
source at the following coordinates: RA(J2000) = 18h 35m 45.9s,
Dec(J2000) = 52d 37m 38.1s, with an estimated uncertainty of 10
arcseconds radius (90% containment). This position is 20 arcseconds
from BAT localization. We note that the XRT position lies 2.5
arcseconds from an possible galaxy with R=18.5 in the APM-North
catalogue (McMahon et al., 2000).
UVOT took a finding chart exposure of 100 seconds with the White
(160-650 nm) filter starting 74.2 seconds after the BAT trigger.
There is no detected new source in the rapidly available 2.7'x2.7'
sub-image, to a limiting White magnitude of about 19.1.
We are currently in the beginning of the Malindi downlink gap, so we
will not have the full data set until at least 01:00 03/May/06 UT.
- GCN Circular #5056
V. Lipunov, V.Kornilov, N.Tyurina, A.Belinski, D.Kuvshinov, E.Gorbovskoy,
A.Krylov, G.Borisov, A.Sankovich, V.Vladimirov, P.Gritsyk, S.Korobkin
Sternberg Astronomical Institute, Moscow Union 'Optic'
MASTER robotic system
(http://observ.pereplet.ru) responded
to GRB060502B (GRB_TIME is 2006-05-02 17:24:41.07, E. Troja et al.
GCN5055) by unfiltered, BVR-filtered, spectral and high time
resolution cameras.
The first image was at 2006-05-02 17:25:50.11 UT,
69 s after the GRB time on the bright evening sky.
The first images with more or less good limit was at 82 min after the GRB
time at high air mass.
The unfiltered image is calibrated relative to USNO A2.0 (0.8 R + 0.2 B).
The robot not find OT-candidate in error box brighter then 16.0 (s/n=5)
at Swift XRT position.
This work is supported by RFFI 04-02-16411 grant.
This message can be cited.
Mailto: lipunov@sai.msu.ru
- GCN Circular #5057
M.Zhai, Y.L. Qiu, J.Y. Wei, J.Y. Hu, J.S. Deng(NAOC),X.F. Wang (THCA),
K.Y. Huang (NCU), Y. Urata (Saitama Univ.)
on behalf of EAFON report:
"We have imaged the field of GRB 060502B (Troja et al. GCN 5055) with
clear, R and I band using the 0.8m telescope at Xinglong Observatory.
First imaging was started from 305 s after the trigger. The limiting
magnitude is clear = ~ 20 (12 min after) and R=20.6 (60 min after)
derived from USNO-B1.0 r catalog. No new source was detected
brighter than the limits in the XRT error circle.
Further analysis is in progress."
This message may be cited.
- GCN Circular #5059
E. Troja (INAF-IASFPA), V. Mangano (INAF-IASFPA), J. Kennea (PSU),
A. Moretti (INAF-OAB) on behalf of the Swift XRT team:
A re-analysis of the XRT TDRSS data has led to a different position
from the one issued with GCN 5055. The new estimated position for
the candidate X-ray afterglow is:
RA (2000) = 18 35 45.6
Dec (2000) = +52 37 54.2
with an uncertainty of 7 arcsec (90% confinement).
We are still waiting for down-linked data for refined
coordinates of the source.
We apologize for the inconvenient.
- GCN Circular #5062
D. A. Kann, S. Klose & P. Ferrero (TLS Tautenburg) report:
We observed the location of the short burst GRB 060502B (Troja et al., GCN 5055)
with the Tautenburg 1.34m Schmidt telescope.
Observations were taken under bad observing conditions (airmass 1.95, twilight,
moonlight). The observation consisted of a single 900 sec exposure in the R band
taken at a mid-exposure time of 20060502.8356, 0.1101 days after the burst.
Due to the conditions, the image limit is shallow, with a 3 sigma limiting magnitude
of 20.2. The Galaxy mentioned in GCN 5055 is clearly detected at a magnitude of R
= 18.1 +/- 0.09 (measured vs. several surrounding USNO1.0B stars).
We detect a possible additional source to the southeast of the center of the galaxy
(but within the PSF in our image), at RA = 18:35:45.90, Dec.= +52:37:33.20 (errors
+/- 0.5"), which could possibly be a superposed faint afterglow, reminescent of
GRBs 050709 or 050724. But there seems to be a source here also in the DSS R
image, so this identification is very unsure.
Furthermore, we note that this galaxy is not included in the revised error circle
(Troja et al., GCN 5059) any more, which would rule it out as a host galaxy
altogether, unless it lies at low redshift and the progenitor has been ejected from the
galaxy. Spectroscopy is encouraged.
No source is detected at all within the revised error circle.
We are grateful to S. Melnikov for observing time.
This message may be cited.
- GCN Circular #5063
E.Troja,(INAF-IASFPA), V. Mangano (INAF-IASFPA),
V. La Parola (INAF-IASFPA), D. N. Burrows (PSU)
report on behalf of the Swift XRT Team:
We have analyzed the first 10 ks of PC data of GRB060502B
(Troja et al 2006, GCN 5055).
The refined position of the source is
RA (2000) = 18h 35m 45.65s
Dec (2000) = +52d 37' 51.97''
with an uncertainty of 5.4 arcsec (90% containement).
This position is only 4 arcsec from the corrected
XRT position (Troja et al 2006, GCN 5059).
The 0.2-10 keV X-ray light curve shows a decay behaviour
with slope of -1.2 +/ 0.2.
There are only 36 counts in the extraction region, that are not
enough for a detailed spectral analysis. The estimated source flux,
assuming a photon index of 2.0, is about 10^-13 ergs cm^-2 s^-1.
If decaying at the present rate the source will reach the
flux level of 1.5 x 10^-15 erg cm^-2 s^-1 (corresponding to
a count rate level of 2.9 x 10^-5 counts s^-1) after one day.
This Circular is an official product of the Swift XRT Team.
- GCN Circular #5064
G. Sato (ISAS), L. Barbier (GSFC), S. Barthelmy (GSFC),
J. Cummings (GSFC/ORAU), E. Fenimore (LANL), N. Gehrels (GSFC),
D. Hullinger (BYU-Idaho), H. Krimm (GSFC/USRA), M. Koss (UMD),
C. Markwardt (GSFC/UMD), J. Norris (GSFC), D. Palmer (LANL),
A. Parsons (GSFC), T. Sakamoto (GSFC/ORAU), M. Stamatikos (GSFC/ORAU),
E. Troja (INAF-IASFPA), J. Tueller (GSFC)
on behalf of the Swift-BAT team:
Using the data set from T-119 to T+183 sec from the recent telemetry downlink,
we report further analysis of BAT GRB 060502B (trigger #208275)
(Troja, et al., GCN 5055). The BAT ground-calculated position is RA,Dec =
278.949, 52.642 deg {18h 35m 47.7s, 52d 38' 32.5"} (J2000) +- 1.8 arcmin,
(radius, sys+stat, 90% containment). The partial coding was 92%.
The lightcurve consists of two spikes. The main peak starts at ~T-0.060
and has a FWHM of ~40 msec. Its rise is faster than the decay.
There is also a possible second peak (a precurrsor) starting at
T-0.3 sec with a FWHM of ~100 msec and a significance of only ~4 sigma.
T90 (15-350 keV) is 90 +- 20 msec (estimated error including systematics).
The lag analysis shows this burst to be cleanly in the short hard burst class
(Norris and Bonnell, 2006, ApJ, accepted; see, Figure 3).
Specifically, the measured lags for the main peak are:
-4.0 ms +- 3.0 ms (15-25 keV vs. 50-100 keV)
-0.2 ms +- 2.8 ms (25-50 keV vs. 100-350 keV)
The time-averaged spectrum from T-0.05 to T+0.04 is best fit by a simple
power-law model. The power law index of the time-averaged spectrum is
0.92 +- 0.23. The fluence in the 15-150 keV band is
4 x 0.5 x 10^-8 erg/cm2. The 1-sec peak photon flux measured
from T-0.43 sec in the 15-150 keV band is 4.4 +- 0.6 ph/cm2/sec.
All the quoted errors are at the 90% confidence level.
- GCN Circular #5065
I.Takahashi, T.Uehara, K.Yoshida, A.Kobayashi, K.Tanaka,
Y.E.Nakagawa, S.Sugita, K.Yamaoka, A.Yoshida (AGU) report:
The robot optical telescope, AROMA, at Aoyama Gakuin University (AGU)
responded to GRB 060502B (Troja et al. GCN 5055).
The observations started at 17:26:26 UT (105s after the GRB) by the
0.3m optical telescope with R-band filter located at the AGU campus
in Sagamihara, Japan.
No new source was found above the 3 sigma limiting magnitude of R~16
calibrated with USNO A2.0 by the preliminary routine analysis on the
first 20 frames of image with 5s exposure each. The mean time of the
data set corresponded to 319s after the burst.
Further analysis is underway.
- GCN Circular #5066
J. P. Halpern (Columbia U.) and N. Mirabal (U. Michigan) report:
"We observed the location of Swift short GRB 060502B (Troja et al., GCN 5055)
in the R band on the MDM 1.3m telescope starting on May 03 08:22 UT,
15 hours after the trigger. A summed 45 minute exposure has a limiting
magnitude of R~23.5. To this limit, there is a single object in the refined
XRT error circle of Troja et al. (GCN 5063), at coordinates
(J2000) 18h 35m 45.89s +52d 37' 56.2" (+/- 1")
Its magnitude is R = 21.6 +/- 0.1, calibrated with Landolt standard stars,
and it appears unresolved in seeing of 1.7". Further optical observations
are encouraged.
This message may be cited."
- GCN Circular #5069
T. S. Poole (UCL-MSSL), and E. Troja (INAF-IASFPA) on behalf of the
Swift/UVOT team.
The Swift/UVOT began observing the field of GRB060502b (BAT
Trigger=208275, E. Troja, et. al, GCN 5055) at 17:25:38 UT, 57s after
the BAT trigger (which includes the 10s V filter settling exposure). No
new source is detected at the XRT position (E. Troja, GCN 5063) in
coadded images with any of the filters. The following 5-sigma magnitude
upper limits are not corrected for Galactic extinction; E(B-V) = 0.044.
Filter T_range(s) T_exp(s) 5sigma(mag)
V 57-35329 3002 20.29
B 658-24560 1204 20.62
U 634-41112 3819 21.04
UVW1 610-40198 4038 21.29
UVM2 586-36126 3633 21.31
UVW2 686-34417 2259 21.29
WHITE 74-6845 619 20.49
Where T_range is time post-trigger, and T_exp is the exposure time of
the observation. A 6 arcsec radius was used for all filters.
This message may be cited.
- GCN Circular #5071
E. Berger (Carnegie Observatories), S. B. Cenko and A. Rau (Caltech)
report on behalf of a larger collaboration:
"We used the GMOS instrument on the Gemini North Telescope to image the
field of GRB 060502b (GCN 5064) and to obtain a spectrum of the object
detected within the XRT error circle (GCN 5063) by Halpern and Mirabal
(GCN 5066). We detect the latter object in a combined 1500 sec exposure
with an r-band magnitude of about 21.8, suggesting that the object has not
faded between the time of the MDM observation (15 hrs post burst) and our
observation (17 hrs post burst). Moreover, a spectrum of the object
reveals broad absorption bands centered on 5900, 6200, and 6700 A, which
are typical of cool giants (a comparison to stellar spectra indicates a
M2V - M4V classification).
In addition to this star, we also identify a fainter and marginally
extended object within the XRT error circle with r~24.7 mag located at
(J2000):
RA = 18:35:46.06
DEC= +52:37:51.46
with an uncertainty of about 0.3" in each coordinate.
An image of the region centered on the XRT error circle is available at:
http://www.ociw.edu/~eberger/grb060502b_gemini.gif
Source "S1" is the object found by Halpern and Mirabal (shown here to be a
star), and source "G1" is the faint galaxy discussed above."
- GCN Circular #5072
J. P. Halpern (Columbia U.) and N. Mirabal (U. Michigan) report:
"Following our initial report in GCN 5066, we continued observing the
XRT location of Swift short GRB 060502B (Troja et al., GCNs 5055,5063)
in the R band on the MDM 1.3m telescope on May 3 and 4 UT. In a summed
75 minute exposure centered at May 3 09:02 UT, we clearly detect the faint
galaxy candidate "G1" seen in the Gemini North image of Berger et al.
(GCN 5064) that was taken about 1.5 hours later. Observing on the
following night, a summed 105 minute exposure centered at May 4 08:56 UT
again shows "G1" at about the same magnitude. We measure R~23.9 for this
object, somewhat brighter than Berger et al. (GCN 5064). MDM images of
this field are posted at
http://www.astro.columbia.edu/~jules/grb/060502b/
This message may be cited."
- GCN Circular #5073
I.Takahashi, T.Uehara, K.Yoshida, A.Kobayashi,
T.Koshiishi, K.Tanaka, Y.E.Nakagawa, S.Sugita, K.Yamaoka,
A.Yoshida (AGU) report:
After the previous report (GCN 5065), we carried out
further photometric calibrations for the observations
of the GRB 060502B field (Troja et al. GCN 5055, GCN 5059).
We have taken 100 frames of R band image with 20s exposure
each and photometric calibration was mede by every 20 frames
by comparing with USNO A2.0 stars in the same field.
The 3 sigma limiting magnitude of each combined image
is as below.
data set mean time time - burst[s] lim-mag R (3sigma)
======================================================
1st 17:30:00 UT 319 16.12 +/-0.16
2nd 17:37:35 UT 774 16.26 +/-0.19
3rd 17:45:13 UT 1232 16.00 +/-0.05
4th 17:52:44 UT 1683 16.00 +/-0.02
5th 18:00:13 UT 2132 16.30 +/-0.02
- GCN Circular #5074
E.J.A. Meurs, S.D. Vergani, C. O'Maoileidigh (Dunsink Observatory), D.
Malesani (SISSA), and R. Gualandi (Loiano Observatory), report:
We observed the field of the short GRB 060502B (Troja et al. 2006, GCN
5055) with the 152 Cassini telescope located in Loiano, Italy, equipped
with BFOSC. Observations were conducted under moderate weather
conditions (passing cirrus), securing three 20-min exposures. The mean
time was May 2.96198 UT (5.68 hr after the burst). The average seeing
was 1.8". No source was detected inside the revised XRT error circle
(Troja et al. 2006, GCN 5063) in the coadded frame. The limiting
magnitude is R = 20.6 (3 sigma) based on the USNO catalog.
This message can be cited.
- GCN Circular #5077
P.A. Price (IfA, Hawaii), E. Berger (OCIW), D.B. Fox (Penn State), S.B.
Cenko and A. Rau (Caltech) report on behalf of a larger collaboration:
We have obtained a second epoch of imaging with the Gemini North
telescope of the XRT localisation of the short/hard GRB 060502B (GCN
#5063). The observations commenced at 2006 May 4.43 UTC (1.7 days after
the GRB), and consisted of 5 x 300 sec exposures in r'. These
observations have better seeing and depth than our first epoch
observation (2006 May 3.43 UTC, 0.7 days after the GRB; GCN #5071).
Image subtraction does not reveal any variable sources within the XRT
error circle. In particular, the galaxy ("G1") and source ("S1")
identified in our previous observations have not appreciably changed in
brightness.
These observations place a limiting magnitude of any optical afterglow
in our first epoch observation of approximately R ~ 24.3 mag, based on
assuming R=17.5 mag for USNO-B1 star 426-035230 (RA,Dec =
278.92572,52.61611).
We identify in the second epoch image an additional faint source ("S2")
at R ~ 25.8 mag in the error circle at approximate coordinates:
18:35:45.86 +52:37:50.0 J2000
An image of the field is available at:
http://www.ifa.hawaii.edu/~price/grb060502b.gif
Note that the magnitude of the faint galaxy ("G1") in GCN #5071 is
measured to be R ~ 23.8 mag in our first epoch observation, using the
above calibration, consistent with the observation of Halpern & Mirabal
(GCN #5072). We apologise for any inconvenience this error may have
caused.
We thank the Gemini North observing team for obtaining these
observations.
- GCN Circular #5093
E. Troja (INAF-IASFPA), D. N. Burrows (PSU), and N. Gehrels (NASA/GSFC)
report on behalf of the Swift XRT Team:
We have improved the astrometry of the Swift XRT observation of the
short hard burst GRB 060502B (Troja et al. 2006, GCN Circs. 5055, 5059,
and 5063) using 28 serendipitous X-ray sources detected in the field
during our 30 ks observation.
We find 13 possible associations in the 2MASS or USNO 1.0B catalogs.
Four of these could be random matches, based on simulations with
28 sources placed randomly within the XRT field of view. From the 13
possible associations, we selected 7 guide sources with offsets <~ 3
arcsec from the X-ray sources, and used them to derive an astrometry
correction using the ccorr command in XIMAGE. We obtained shifts in the
coordinates of DeltaRA=1.3 arcsec, DeltaDec=-0.6 arcsec.
The final best position of the X-ray afterglow is:
RA(J2000) = 18h 35m 45.74s
Dec(J2000) = +52d 37' 52.47''
The uncertainty in the afterglow position on the detector is 2.0 arcsec.
The RMS scatter in the offsets between the corrected X-ray source
positions and the optical counterparts is 1.9 arcsec, giving us a 90%
confidence error radius of 4.4 arcsec.
This position is 1.0 arcsec from the previously reported XRT refined
position (GCN 5063) and 3.1 arcsec from the candidate galaxy G1 (Price
et al. 2006, GCN 5071).
- GCN Circular #5184
V.Rumyantsev (CrAO), R. Karimov (MAO), R. Salyamov (MAO), E. Pavlenko
(CrAO), Yu. Efimov (CrAO), A. Pozanenko (IKI), M. Ibrahimov (MAO) on beh=
alf
of larger GRB follow up collaboration report:
We observed the location of Swift short GRB060502B (Troja et al., GCNs 50=
55,
5059, 5063, 5093) in the R band with 1.5m telescope of Maidanak Astronomi=
cal
Observatory (MAO) starting on May 02 22:43 (UT) (5.3 hours after the
trigger) and Shajn 2.6m telescope of CrAO between May 03 (UT) 01:27 - 02=
:41
(8.6 hours after the trigger). Totally we obtained 6 images of 180 sec
exposure with mean seeing ~0.95" in Maidanak 1.5m and 39 images of 60 sec
exposure in CrAO observatory (seeing ~3"). In combined images we detect=
G1
galaxy mentioned by Berger et al. (GCN 5071) and Halpern et al. (GCN 507=
2)
and do not detect S2 source (Price et al. GCN 5077). A photometry of G1 a=
nd
S1 sources is based on USNO B1.0 star R=3D17.5 mag (USNO-B1 426-035230 R=
A,
Dec =3D 278.92572,52.61611):
Mid time Telescope Exp. G1 S1 Limiting (UT)
sec mag mag mag
May 02.954 MAO 1.5m 6=C8180 ~24.2 21.40 +/-0.10 23.6
May 03.086 CrAO 2.6m 39x60 23.7 +/-0.3 21.65 +/-0.05 24.1
Our brightness estimation of G1 is consistent with brightness estimations
obtained in MDM 1.3 (T0+15 h) R~23.9 (Halpern et al. GCN5072) and in
Gemini North (T0+17 h) R~23.8 (Price et al. GCN5077).
The combined images can be found in
http://grb.rssi.ru/GRB060502b
This message may be cited.
- GCN Circular #5238
GRB 060502B: A Bright Early-type Galaxy as Putative Host of the Short
Burst
J. S. Bloom, D. Perley, D. Kocevski, N. Butler (UC Berkeley), J. X.
Prochaska (UCO/Lick), and H.-W. Chen report:
On 31 May 2006 UT, using Keck I (+LRIS), we obtained spectra of a
bright red extended source ("G*"; RA, DEC J2000 = 18:35:45.7,
+52:37:37) that is 11.2 arcsec South of the southern edge of the
revised XRT error circle (Troja et al. GCN 5093). Strong absorption
features, which we identify as Ca II H+K, indicate a redshift for
this early type galaxy of z=0.287. Weak [OII] emission can be seen
indicating some low level of active star formation.
We advance the hypothesis that this galaxy is the host of short burst
GRB 060502B (Troja et al. GCN 5055) based on several points:
1. The galaxy is a massive early-type similar to the putative
hosts of 050509B [1] and 050724 [2].
2. The redshift inferred of the hosts of 050509b (z=0.225) and
050724 (z=0.258) are remarkably similar to that of G* indicating
comparable energetics of the respective bursts.
3. At the redshift of z=0.287, the burst location would be
between 47 - 67 kpc in projection from the center of the putative
host, similar to the offset (39 +/- 13 kpc) inferred for 050509b.
There are viable progenitors scenarios (e.g. degenerate binary
mergers) where bursts occur at such distances from their birthsite.
4. Weak X-ray afterglow and no detected optical afterglow would
seem to indicate a low density circumburst environment, as would be
expected if the GRB originated far from the progenitor birthsite.
We recognize the difficulty of now confirming this hypothesis but
note that in the striking similarity of the host, redshift,
afterglow, and offset configuration to GRB 050509b, these
observations and inferences have a priori precedent."
A false color image will be posted at:
http://astro.berkeley.edu/~jbloom/grb060502B_color_keck1.gif
This message may be cited.
[1] Bloom et al. 2006ApJ...638..354B (astro-ph/0505480); Gehrels et
al. 2005Natur.437..851G (astro-ph/0505630)
[2] Berger et al. Nature 438 (2005) 988-990 (astro-ph/0508115)
- astro-ph/0607223 from 11 Jul 2006
Bloom: A Putative Early-Type Host Galaxy for GRB 060502B: Implications for the Progenitors of Short-Duration Hard-Spectrum Bursts
Starting with the first detection of an afterglow from a short-duration
hard-spectrum gamma-ray burst (SHB) by Swift last year, a growing body of
evidence has suggested that SHBs are associated with an older and
lower-redshift galactic population than long-soft GRBs and, in a few cases,
with large (>~ 10 kpc) projected offsets from the centers of their putative
host galaxies. Here we present observations of the field of GRB 060502B, a SHB
detected by Swift and localized by the X-ray Telescope (XRT). We find a massive
red galaxy at a redshift of z=0.287 at an angular distance of 17.5" from our
revised XRT position. Using associative and probabilistic arguments we suggest
that this galaxy hosted the progenitor of GRB 060502B. If true, this offset
would correspond to a physical displacement of 73 +/- 15 kpc in projection,
about twice the largest offset inferred for any SHB to date and almost an order
of magnitude larger than a typical long-soft burst offset. Spectra and modeling
of the star-formation history of this possible host show it to have undergone a
large ancient starburst. If the progenitor of GRB 060502B was formed in this
starburst episode, this would be the first direct constraint on the age and
minimum kick velocity of a SHB progentior from its birthsite. In particular,
tau = 1.3 +- 0.2 Gyr and v_kick_min = 55 +- 15 km/s.
- 1101.1088 from 7 Jan 11
Ross P. Church et al.: Implications for the origin of short gamma-ray bursts from their observed positions around their host galaxies
We present the observed offsets of short-duration gamma-ray bursts (SGRBs) from their putative host galaxies and compare them to the expected
distributions of merging compact object binaries, given the observed properties of the hosts. We find that for all but one burst in our sample
the offsets are consistent with this model. For the case of bursts with massive elliptical host galaxies, the circular velocities of the hosts'
haloes exceed the natal velocities of almost all our compact object binaries. Hence the extents of the predicted offset distributions for
elliptical galaxies are determined largely by their spatial extents. In contrast, for spiral hosts the galactic rotation velocities are smaller
than typical binary natal velocities and the predicted burst offset distributions are more extended than the galaxies.
One SGRB, 060502B, apparently has a large radial offset that is inconsistent with an origin in a merging galactic compact binary. Although it
is plausible that the host of GRB 060502B is mis-identified, our results show that the large offset is compatible with a scenario where at
least a few per cent of SGRBs are created by the merger of compact binaries that form dynamically in globular clusters.
- 1110.4209 from 20 Oct 11
Ross P. Church et al.: Short gamma-ray bursts: evidence for an origin in globular clusters?
We compare the observed spatial offsets of short gamma-ray bursts from their host galaxies with their predicted distributions, assuming that
they originate in double neutron star binaries that form from field stars. We find that, for the majority of bursts, this model is sufficient
to explain the observed offsets, although there is a trend towards larger offsets than predicted. One burst, GRB 060502B, has an offset that is
clearly anomalous. We discuss possible reasons for the large offsets, including host galaxy misidentification, and suggest that some of the
largest-offset bursts may originate in the merger of double neutron star binaries that form dynamically in the cores of globular clusters.