- GCN/BACODINE POSITION NOTICE
TITLE: GCN/SWIFT NOTICE
NOTICE_DATE: Mon 12 Nov 07 18:23:49 UT
NOTICE_TYPE: Swift-BAT GRB Position
TRIGGER_NUM: 296503, Seg_Num: 0
GRB_RA: 260.305d {+17h 21m 13s} (J2000),
260.675d {+17h 22m 42s} (current),
257.965d {+17h 11m 52s} (1950)
GRB_DEC: -80.884d {-80d 53' 02"} (J2000),
-80.892d {-80d 53' 29"} (current),
-80.832d {-80d 49' 53"} (1950)
GRB_ERROR: 3.00 [arcmin radius, statistical only]
GRB_INTEN: 1360 [cnts] Image_Peak=103 [image_cnts]
TRIGGER_DUR: 0.256 [sec]
TRIGGER_INDEX: 126 E_range: 50-350 keV
BKG_INTEN: 23836 [cnts]
BKG_TIME: 66197.64 SOD {18:23:17.64} UT
BKG_DUR: 8 [sec]
GRB_DATE: 14416 TJD; 316 DOY; 07/11/12
GRB_TIME: 66211.53 SOD {18:23:31.53} UT
GRB_PHI: -173.27 [deg]
GRB_THETA: 32.84 [deg]
SOLN_STATUS: 0x3
RATE_SIGNIF: 21.28 [sigma]
IMAGE_SIGNIF: 7.92 [sigma]
MERIT_PARAMS: +1 +0 +0 -2 +3 +7 +0 +0 -42 +1
SUN_POSTN: 227.54d {+15h 10m 09s} -17.74d {-17d 44' 06"}
SUN_DIST: 64.72 [deg] Sun_angle= -2.2 [hr] (East of Sun)
MOON_POSTN: 259.63d {+17h 18m 31s} -27.90d {-27d 53' 46"}
MOON_DIST: 53.00 [deg]
MOON_ILLUM: 7 [%]
GAL_COORDS: 312.10,-23.34 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS: 267.15,-57.54 [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 = 10.45,20.45 [deg].
- red DSS finding chart
ps-file
- GCN NOTICE
TITLE: GCN/SWIFT NOTICE
NOTICE_DATE: Mon 12 Nov 07 18:27:01 UT
NOTICE_TYPE: Swift-BAT GRB Lightcurve
TRIGGER_NUM: 296503, Seg_Num: 0
GRB_RA: 260.305d {+17h 21m 13s} (J2000),
260.675d {+17h 22m 42s} (current),
257.965d {+17h 11m 52s} (1950)
GRB_DEC: -80.884d {-80d 53' 02"} (J2000),
-80.892d {-80d 53' 29"} (current),
-80.832d {-80d 49' 53"} (1950)
GRB_DATE: 14416 TJD; 316 DOY; 07/11/12
GRB_TIME: 66211.53 SOD {18:23:31.53} UT
TRIGGER_INDEX: 126
GRB_PHI: -173.27 [deg]
GRB_THETA: 32.84 [deg]
DELTA_TIME: 52.00 [sec]
TRIGGER_DUR: 0.256 [sec]
SOLN_STATUS: 0x3
RATE_SIGNIF: 21.28 [sigma]
IMAGE_SIGNIF: 7.92 [sigma]
LC_URL: sw00296503000msb.lc
SUN_POSTN: 227.54d {+15h 10m 09s} -17.74d {-17d 44' 08"}
SUN_DIST: 64.72 [deg] Sun_angle= -2.2 [hr] (East of Sun)
MOON_POSTN: 259.66d {+17h 18m 39s} -27.90d {-27d 53' 50"}
MOON_DIST: 53.00 [deg]
MOON_ILLUM: 7 [%]
GAL_COORDS: 312.10,-23.34 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS: 267.15,-57.54 [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 = 10.45,20.45 [deg].
- GCN Circular #7058
M. Perri (ASDC), S. D. Barthelmy (GSFC), J. R. Cummings (NASA/UMBC),
N. Gehrels (NASA/GSFC), C. Gronwall (PSU),
S. T. Holland (CRESST/USRA/GSFC), J. A. Kennea (PSU),
C. B. Markwardt (CRESST/GSFC/UMD), S. Mateos (U Leicester),
D. M. Palmer (LANL), A. M. Parsons (GSFC),
P. Romano (Univ. Bicocca & INAF-OAB),
R. L. C. Starling (U Leicester), G. Stratta (ASDC),
T. N. Ukwatta (GSFC/GWU), D. E. Vanden Berk (PSU) and
S. D. Vergani (DIAS-DCU) report on behalf of the Swift Team:
At 18:23:31 UT, the Swift Burst Alert Telescope (BAT) triggered and
located GRB 071112B (trigger=296503). Swift did not slew because
of the Earth observing constraint. Swift will slew at T+33 min.
The BAT on-board calculated location is
RA, Dec 260.305, -80.884 which is
RA(J2000) = 17h 21m 13s
Dec(J2000) = -80d 53' 02"
with an uncertainty of 3 arcmin (radius, 90% containment, including
systematic uncertainty). The BAT light curve shows a double spike
structure with a duration of about 1 sec. The peak count rate
was ~4500 counts/sec (15-350 keV), at ~0 sec after the trigger.
Because of an Earth limb constraint, the spacecraft did not slew promptly
to the BAT position, and so there are no immediate XRT or UVOT data
products to analyze.
Burst Advocate for this burst is M. Perri (perri AT asdc.asi.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 #7060
E.S. Rykoff (UCSB), F. Yuan (U Mich), W. Rujopakarn (Steward), report on
behalf of the ROTSE collaboration:
ROTSE-IIIc, located at the H.E.S.S. site at Mt. Gamsberg, Namibia,
responded to the short/hard GRB 071112B (Swift trigger 296503; Perri et
al., GCN 7058), producing images beginning 6.8 s after the GCN notice
time. An automated response took the first image at 18:23:55.8 UT, 24.3
s after the burst, under fair conditions. We took 10 5-sec, and 10
20-sec exposures before ROTSE-IIIc repointed at Swift trigger 296504
(GRB071111C). These unfiltered images are calibrated relative to USNO
A2.0 (R).
Comparison to the DSS (second epoch) reveals no new sources within the
3-sigma Swift/BAT error circle, for both single images and coadding into
sets of 10. Individual images have limiting magnitudes ranging from
15.3-16.3; we set the following specific limits.
start UT end UT t_exp(s) mlim t_start-tGRB(s) Coadd?
--------------------------------------------------------------------
18:23:55.8 18:24:00.8 5 15.5 24.3 N
18:23:55.8 18:25:45.1 109 16.6 24.3 Y
18:25:53.0 18:31:02.2 309 17.3 141.5 Y
- GCN Circular #7071
E. Fenimore (LANL), S. D. Barthelmy (GSFC), J. Cummings (GSFC/UMBC),
N. Gehrels (GSFC), H. Krimm (GSFC/USRA), C. Markwardt (GSFC/UMD),
D. Palmer (LANL), A. Parsons (GSFC), M. Perri (ASDC),
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-120 to T+182 sec from the recent telemetry downlink,
we report further analysis of BAT GRB 071112 (trigger #296503)
(Perri, et al., GCN Circ. 7058). The BAT ground-calculated position is
RA, Dec = 260.213, -80.884 deg, which is
RA(J2000) = 17h 20m 51.0s
Dec(J2000) = -80d 53' 02"
with an uncertainty of 2.2 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 78%.
The mask-weighted light curve shows two separated narrow peaks. The first
starts at T-0.7 sec and has a total width of ~64 msec. The second
starts at T+0.0 sec, peaks at T+0.1 sec, and ends at 0.3 sec.
T90 (15-350 keV) is 0.30 +- 0.05 sec (estimated error including systematics).
The time-averaged spectrum from T-0.0 to T+0.3 sec is best fit by a simple
power-law model. The power law index of the time-averaged spectrum is
0.69 +- 0.34. The fluence in the 15-150 keV band is 4.8 +- 0.9 x 10^-8 erg/cm2.
The 1-sec peak photon flux measured from T-0.38 sec in the 15-150 keV band
is 1.3 +- 0.3 ph/cm2/sec. All the quoted errors are at the 90% confidence
level.
The automated script processing has generated fluence and spectral numbers
for the second peak only. Since there seems to be urgent need in the
community, we are pushing this circular out the door quickly so that at
least these partial (second peak only) values are available to the
follow-up community. By eye, the first peak appears to have a fluence
one third that of the second peak. Also by eye, there appears to be no
extended emission for this SHB out to at least T+180 sec and to a flux
level ~0.007 counts/cm2/sec.
- GCN Circular #7072
M. Perri, G. Stratta (ASDC), D.N. Burrows (PSU) report on behalf of the
Swift-XRT team:
The Swift-XRT began observing the field of the short hard GRB 071112B
(trigger=296503, Perri et al., GCN Circ. 7058) at 19:25:35 UT, about
62 minutes after the BAT trigger. In the first 2.1 ks of Photon Counting
mode data, no X-ray source is detected within the refined BAT error
circle (Fenimore et al., GCN Circ. 7071)
We estimate a 3-sigma upper limit on the count rate of ~5e-3 cts/s.
Assuming a power-law spectrum with photon index Gamma=2 and a Galactic
column density of 7.9e20 cm-2, this corresponds to an upper limit on the
observed flux of ~2e-13 ergs/cm2/s (0.3-10 keV)
This is an official product of the Swift XRT Team.
- GCN Circular #7073
J. S. Bloom, D. Kocevski (UC Berkeley), and H.-W. Chen report:
"We obtained target of opportunity imaging of the field of SHB
071112B (Perri et al. GCN 7058; Fenimore et al. 7071) on Gemini South
after twilight. Several images of 15 sec and 180 sec were obtained
as the sky darkened. Inspection of a single 180 sec image in r band
(start = 2007-11-13 00:51:17.5 UTC) did not reveal a bright new
source when compared to DSS2 (Red) inside the reported XRT error
circle, although we do note a very weak candidate near the DSS limit
at (J2000):
RA: 17:21:15.62
DEC: -80:53:50
We make no claims to variability nor newness at this time, but
further Gemini observations are planned."
We thank Ruben Diaz and the entire Gemini staff for assistance in
taking this data.
- GCN Circular #7074
J. S. Bloom notes:
"The position of the source noted in GCN #7073 should read:
17:21:27.1, -80:53:48
We thank E. Berger for correspondence on this source (who also
pointed out that that source appears in the DSS II N-plate)."
- GCN Circular #7075
E. Berger (Princeton/OCIW) and P. Challis (CfA) report:
"We observed the BAT error circle of the short GRB 071112B (GCN 7071) with
LDSS3 on the Magellan/Clay telescope. A total of 1200 sec were obtained
in the i-band in 0.9" seeing starting 6.25 hours after the burst. A
comparison to DSS reveals no new bright sources within the BAT error
circle. A comparison of the first and final images (with a separation of
20 min) reveals no clear fading sources, although we note that the time
baseline is very short. Further observations are in progress."
- GCN Circular #7077
P. Schady (MSSL-UCL) and M. Perri (ASDC) report on behalf of the Swift
UVOT team:
The Swift UVOT observed the field of GRB 071112B (Perri et al., GCN 7058)
62 minutes after the BAT trigger, once the Earth had come out of observing
constraint. No new source is found in any of the UVOT observations in
either single or co-added exposures within the refined BAT error circle
(Fenimore et al., GCN 7071) or anywhere within the UVOT field of view down
to the following 5-sigma upper limits:
Filter Tmid Exp Magnitude
(s) (s) (5-sigma UL)
White 8864 885 > 20.7
v 3826 197 > 18.2
b 8306 197 > 19.5
u 6905 290 > 19.1
uvw1 4236 197 > 18.8
uvm2 4031 197 > 18.7
uvw2 9419 187 > 18.9
where Tmid is the weighted mean of the co-added exposures. The values
quoted above are not corrected for the expected Galactic extinction
corresponding to a reddening of E(B-V) = 0.12 mag in the direction of the
GRB (Schlegel et al. 1998).
- GCN Report 103.1
GCN_Report 103.1 has been posted:
http://gcn.gsfc.nasa.gov/reports/report_103_1.pdf
by M. Perri
at ASDC
titled: "Swift Observations of GRB 071112B"
- GCN Circular #7085
E. Berger (Princeton/OCIW) and P. Challis (CfA) report:
"We re-observed the BAT error circle of the short GRB 071112B (GCN 7071)
with LDSS3 on the Magellan/Clay telescope. A total of 1200 sec were
obtained in the i-band in 0.8" seeing starting about 30 hours after the
burst. A comparison to our first epoch of imaging taken about 6 hours
after the burst (GCN 7075) reveals no variable sources to a conservative
limit of about 23.5 mag. Further analysis is in progress."
- GCN Circular #7095
Mark H. Wieringa (Australia Telescope National Facility), Poonam
Chandra (UVA/NRAO), and Dale A. Frail (NRAO) report on behalf
of a larger collaboration:
"We observed the region centered on the Swift burst GRB 071112B (GCN 7058)
using the Australia Telescope Compact Array starting at UT 7.0 Nov 14, 07
and ending at UT 15.0 Nov 14, 07. No emission was seen at a frequency of
8.7 GHz within the BAT error circle. The 5-sigma detection limits in BAT
error circle are 235 uJy. The map noise is 47 uJy."
The Australia Telescope Compact Array is part of the Australia
Telescope which is funded by the Commonwealth of Australia for
operation as a National Facility managed by CSIRO.
- GCN Circular #7101
K. Wiersema, N. Tanvir (Leicester), A. Levan (Warwick), D. Malesani (DARK,
NBI), P. Jakobsson (Hertfordshire), E. Rol and R. Starling (Leicester)
report on behalf of a larger collaboration:
We observed the BAT position of the short GRB 071112B (GCN 7071) using
FORS2 on the VLT. We acquired two epochs of data, the first in VRI, the
second in R band only. The first R band epoch, consisting of 5 x 4 minutes
exposures, started at 00:25:02 UT on 13 november. The second epoch, again
5 x 4 minutes exposures, started at 00:47:00 UT on 14 november. Both
epochs were taken in good seeing conditions (0.7 and 0.9 arcsec
respectively) but at high airmass. Limiting magnitudes (3 sigma) are
estimated at R = 25.2 and R = 25.5 for the first and second epochs,
respectively.
Both visual inspection and PSF-matched image subtraction using the ISIS2
code (Alard 2000) did not reveal a significantly fading source in or near
the BAT error circle.
We note that the limiting magnitudes above may not be fully representative
for the upper limit on the afterglow brightness, as the BAT error circle
contains some nebulosity, and the dithering pattern employed to avoid the
chip-gap between the two FORS2 chips means that a narrow strip through the
error circle has received comparatively less illumination.
We thank the Paranal staff for their excellent support, particularly
Stephane Brillant and Linda Schmidtobreick.
- GCN Circular #7107
D. Kocevski and J. S. Bloom (U.C. Berkeley), on behalf of a larger
collaboration, report:
"We performed image subtraction between multiple r-band observations
of the error box of SHB 071112B (Perri et al. GCN 7058; Fenimore et
al. 7071) on Gemini South. The first epoch of observations began at
2007-11-13 00h14m UTC (airmass ~2.0) followed by a second epoch ~4
hours later at 2007-11-13 04h08m UTC (airmass ~2.6), with total
exposures of 1800 sec and 1043 sec, seconds respectively. Image
subtraction using the public IPP package (*) software shows no
variable sources to r=23.7 mag (3 sigma) within the >95% of the BAT
error circle. No further observations are planned."
This message may be cited.
* See http://pan-starrs.ifa.hawaii.edu/project/IPP/software/
Previous IAU Circulars 