- GCN/BACODINE POSITION NOTICE
TITLE: GCN/SWIFT NOTICE
NOTICE_DATE: Mon 08 Oct 07 21:56:37 UT
NOTICE_TYPE: Swift-BAT GRB Position
TRIGGER_NUM: 293587, Seg_Num: 0
GRB_RA: 151.548d {+10h 06m 11s} (J2000),
151.668d {+10h 06m 40s} (current),
150.776d {+10h 03m 06s} (1950)
GRB_DEC: +44.334d {+44d 20' 02"} (J2000),
+44.296d {+44d 17' 45"} (current),
+44.578d {+44d 34' 40"} (1950)
GRB_ERROR: 3.00 [arcmin radius, statistical only]
GRB_INTEN: 18244 [cnts] Image_Peak=488 [image_cnts]
TRIGGER_DUR: 4.096 [sec]
TRIGGER_INDEX: 289 E_range: 15-50 keV
BKG_INTEN: 159931 [cnts]
BKG_TIME: 78901.72 SOD {21:55:01.72} UT
BKG_DUR: 40 [sec]
GRB_DATE: 14381 TJD; 281 DOY; 07/10/08
GRB_TIME: 78956.76 SOD {21:55:56.76} UT
GRB_PHI: 82.83 [deg]
GRB_THETA: 12.52 [deg]
SOLN_STATUS: 0x3
RATE_SIGNIF: 11.66 [sigma]
IMAGE_SIGNIF: 9.42 [sigma]
MERIT_PARAMS: +1 +0 +0 +3 +1 +4 +0 +0 -45 +1
SUN_POSTN: 194.03d {+12h 56m 08s} -6.00d {-06d 00' 00"}
SUN_DIST: 63.07 [deg] Sun_angle= 2.8 [hr] (West of Sun)
MOON_POSTN: 170.24d {+11h 20m 57s} +2.89d {+02d 53' 10"}
MOON_DIST: 44.54 [deg]
MOON_ILLUM: 5 [%]
GAL_COORDS: 174.33, 52.83 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS: 136.80, 30.37 [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 = 127.16,-2.57 [deg].
- red DSS finding chart
ps-file
- GCN NOTICE
TITLE: GCN/SWIFT NOTICE
NOTICE_DATE: Mon 08 Oct 07 21:59:34 UT
NOTICE_TYPE: Swift-BAT GRB Lightcurve
TRIGGER_NUM: 293587, Seg_Num: 0
GRB_RA: 151.548d {+10h 06m 11s} (J2000),
151.668d {+10h 06m 40s} (current),
150.776d {+10h 03m 06s} (1950)
GRB_DEC: +44.334d {+44d 20' 02"} (J2000),
+44.296d {+44d 17' 45"} (current),
+44.578d {+44d 34' 40"} (1950)
GRB_DATE: 14381 TJD; 281 DOY; 07/10/08
GRB_TIME: 78956.76 SOD {21:55:56.76} UT
TRIGGER_INDEX: 289
GRB_PHI: 82.83 [deg]
GRB_THETA: 12.52 [deg]
DELTA_TIME: -63.00 [sec]
TRIGGER_DUR: 4.096 [sec]
SOLN_STATUS: 0x3
RATE_SIGNIF: 11.66 [sigma]
IMAGE_SIGNIF: 9.42 [sigma]
LC_URL: sw00293587000msb.lc
SUN_POSTN: 194.04d {+12h 56m 08s} -6.00d {-06d 00' 03"}
SUN_DIST: 63.07 [deg] Sun_angle= 2.8 [hr] (West of Sun)
MOON_POSTN: 170.26d {+11h 21m 02s} +2.87d {+02d 52' 27"}
MOON_DIST: 44.56 [deg]
MOON_ILLUM: 5 [%]
GAL_COORDS: 174.33, 52.83 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS: 136.80, 30.37 [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 = 127.16,-2.57 [deg].
- GCN Circular #6856
A. Moretti (INAF-OAB), S. D. Barthelmy (GSFC), D. N. Burrows (PSU),
N. Gehrels (NASA/GSFC), S. T. Holland (CRESST/USRA/GSFC),
V. Mangano (INAF-IASFPA), F. E. Marshall (NASA/GSFC),
D. M. Palmer (LANL), M. Stamatikos (NASA/ORAU) and
T. N. Ukwatta (GSFC/GWU) report on behalf of the Swift Team:
At 21:55:56 UT, the Swift Burst Alert Telescope (BAT) triggered and
located GRB 071008 (trigger=293587).
The BAT on-board calculated location is
RA, Dec 151.548, +44.334 which is
RA(J2000) = 10h 06m 11s
Dec(J2000) = +44d 20' 02"
with an uncertainty of 3 arcmin (radius, 90% containment, including
systematic uncertainty). The BAT light curve shows a single peak
with a duration of about 15 sec. The peak count rate
was ~1000 counts/sec (15-350 keV), at ~1 sec after the trigger.
Because Swift is in the process of returning to normal operations,
automatic slewing to GRBs is currently disabled outside of
business hours (US EDT). Therefore, there
are no prompt XRT or UVOT observations of this burst.
Burst Advocate for this burst is A. Moretti (moretti AT merate.mi.astro.it).
Please contact the BA by email if you require additional information
regarding Swift followup of this burst. In extremely urgent cases, after
trying the Burst Advocate, you can contact the Swift PI by phone (see
Swift TOO web site for information: http://www.swift.psu.edu/too.html.)
- GCN Circular #6857
Martin Jelinek, Alberto J. Castro-Tirado, Javier Gorosabel
(IAA-CSIC Granada) and R. Piontek (AIP Potsdam) report on
behalf of larger collaboration:
We observed the Swift-BAT errorbox of a GRB 071008
(trigger=293587, Moretti et al., GCN 6856), with an IAC 80cm
telescope at La Palma starting at 05:43 UT (7.8h after the
GRB). Our 3 x 180s combined R-band image has a limiting
magnitude of R < 21.5 and does not show any new source in
comparison to a DSS-Red, implying a DSS-equivalent limit to
the afterglow detection.
- GCN Circular #6866
A. Moretti (INAF-OAB), C. Guidorzi (Univ. Bicocca & INAF-OAB),
P. Romano (Univ. Bicocca & INAF-OAB), report on behalf of the
Swift-XRT team:
Swift XRT observed the GRB 071008 (trigger=293587, Moretti et al., GCN
Circ. 6856) beginning 57 ks after the BAT trigger. In 6857s of Photon
Counting mode data spanning 57-65 ks after the trigger in the BAT
error circle we found 2 faint sources at RA,Dec =151.58851,44.32071
and RA,Dec =151.55340, 44.34459 which are
RA(J2000) = 10 06 21.24 Dec(J2000)= +44 19 14.5
RA(J2000) = 10 06 12.82 Dec(J2000)= +44 20 40.5
with error circles of radius 6.5 and 7.5 arcseconds (90%, including
boresight uncertainties) respectively.
They are at 116 and 40 arcseconds from the BAT position, respectively.
At present, due to the paucity of the observed events, we are unable
to determine whether these sources are fading. Further observations
will be planned when the distance to the Sun will be larger.
This circular is an official product of the Swift-XRT team.
- GCN Circular #6869
E. Fenimore (LANL), S. D. Barthelmy (GSFC), J. Cummings (GSFC/UMBC),
N. Gehrels (GSFC), H. Krimm (GSFC/USRA), C. Markwardt (GSFC/UMD),
A. Moretti (INAF-OAB), D. Palmer (LANL), T. Sakamoto (GSFC/UMBC),
G. Sato (GSFC/ISAS), M. Stamatikos (GSFC/ORAU), J. Tueller (GSFC),
T. Ukwatta (GWU)
(i.e. the Swift-BAT team):
Using the data set from T-239 to T+963 sec from recent telemetry downlinks,
we report further analysis of BAT GRB 071008 (trigger #293587)
(Moretti, et al., GCN Circ. 6856). The BAT ground-calculated position is
RA, Dec = 151.571, 44.303 deg which is
RA(J2000) = 10h 6m 17.0s
Dec(J2000) = 44d 18' 13"
with an uncertainty of 2.0 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 88%.
The mask-weighted light curve shows a symmetrical peak starting at ~T-11 sec,
peaking at ~ T-1 sec, and ending at ~T+10 sec.
T90 (15-350 keV) is 18 +- 1 sec (estimated error including systematics).
The time-averaged spectrum from T-11.0 to T+14.0 sec is best fit by a simple
power-law model. The power law index of the time-averaged spectrum is
2.23 +- 0.27. The fluence in the 15-150 keV band is 2.4 +- 0.4 x 10^-7 erg/cm2.
The 1-sec peak photon flux measured from T-2.04 sec in the 15-150 keV band
is 0.5 +- 0.1 ph/cm2/sec. All the quoted errors are at the 90% confidence
level.
- GCN Circular #6874
V. Rumyantsev (CrAO), A. Pozanenko (IKI) report on behalf of larger GRB
follow-up collaboration:
We observed the error box of short GRB071008 (Moretti et al., GCN 6856)
with Shajn 2.6m telescope of CrAO on Oct. 9. Series of images were obtained
between (UT) 00:15:12 and 01:30:43 in R filter. The limiting magnitude (3
sigma) of a combined image calibrated against USNO-A2.0 is 24.3 mag. The
combined image of a total exposure of 4020 s (67x60 s) covers entire of the
refined BAT error box (Fenimore et al., GCN 6869).
Within error circles of the two XRT sources (Moretti et al., GCN 6866) we
found following optical objects.
Within XRT source at RA(J2000) = 10 06 21.24 Dec(J2000)= +44 19 14.5 there
is a galaxy S1 which also can be detected in SDSS images. However the galaxy
S1 is out of the refined BAT error box (Fenimore et al., GCN 6869).
Within XRT source at RA(J2000) = 10 06 12.82 Dec(J2000)= +44 20 40.5 we
marginally detect S2 object.
It is necessary a second epoch observation to decide about nature of the S2
object.
The combined image can be found at http://grb.rssi.ru/GRB071008
The message can be cited.
- GCN Report 91.1
GCN_Report 91.1 has been posted:
http://gcn.gsfc.nasa.gov/reports/report_91_1.pdf
by A. Moretti
at INAF-OAB
titled: "Swift Observations of 071008"
- GCN Circular #7113
A. Moretti (INAF-OAB), C. Guidorzi (Univ. Bicocca & INAF-OAB), report
P. Romano (Univ. Bicocca & INAF-OAB) on behalf of the Swift XRT team:
The Swift XRT re-observed the field of GRB 071008 (trigger=293587,
Moretti et al., GCN Circ. 6856) on 2007 November 15-19 for a total
exposure of 10.7 ks.
The first source listed in GCN Circ 6866 (Moretti et al., 2007), which
is the only one in the refined BAT error circle (GCN Circ. 6869
Fenimore et al. 2007) is no more detectable. The chance probability of
no variation between the two epochs is < 1E-4. We conclude that this
source is the X-ray afterglow of GRB 071008 and its position is
RA(2000)=151.58851, Dec(2000)=44.3207 which corresponds to
RA(2000) = 10h06m21.24s
Dec(2000) = +44 19 14.6
with a 5.8" radius error circle (90% confidence).
The 3-sigma upper count rate limit at the position of the burst at
3.1E6 seconds after the trigger is 7e-4 counts/s which converts roughly
to 4e-14 ergs/s/cm2.
This circular is an official product of the Swift team
Previous IAU Circulars 