| Summary table |
|---|
| Variable |
Value |
Source |
| T0 |
7:49:39 UTC |
Swift |
| ra |
38.5280° |
Swift |
| decl |
-35.3857° |
Swift |
| pos_error |
5.44e-05° |
Swift |
| T90 |
8.95 s |
Swift |
| T90_start |
7:49:39 UTC |
Swift |
| fluence |
3.90e-07 erg/cm² |
Swift |
| redshift |
1.4230 |
|
| T100 |
8.95 s |
|
| GBM_located |
False |
|
| mjd |
57324.326145833336 |
Swift |
| IPN table |
|---|
| GRB_name |
GRB151029A |
| ra |
38.5333° |
| decl |
-35.3667° |
| pos_error |
5.00e-02° |
| redshift |
1.4230 |
| Swift table |
|---|
| GRB_name |
GRB151029A |
| t_trigger |
7:49:39 UTC |
| ra |
38.5280° |
| decl |
-35.3857° |
| pos_error |
5.44e-05° |
| T90 |
8.95 s |
| fluence |
3.90e-07 erg/cm² |
| redshift |
1.4230 |
| GCN 18522 table |
|---|
| GRB_name |
GRB151029A |
| GCN_number |
18522 |
| Detection_method |
Swift Det |
| t_trigger |
7:49:54 UTC |
| ra |
38.5290° |
| decl |
-35.3540° |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 18522
SUBJECT: GRB 151029A: Swift detection of a burst with an optical counterpart
DATE: 15/10/29 08:49:18 GMT
FROM: Jamie A. Kennea at PSU/Swift-XRT
T. N. Ukwatta (LANL), A. D'Ai (INAF-IASFPA), J. A. Kennea (PSU),
A. Maselli (INAF-IASFPA), P. T. O'Brien (U Leicester) and
D. M. Palmer (LANL) report on behalf of the Swift Team:
At 07:49:54 UT, the Swift Burst Alert Telescope (BAT) triggered and
located GRB 151029A (trigger=662086). Swift slewed immediately to the burst.
The BAT on-board calculated location is
RA, Dec 38.529, -35.354, which is
RA(J2000) = 02h 34m 07s
Dec(J2000) = -35d 21' 14.4"
with an uncertainty of 3 arcmin (radius, 90% containment, including
systematic uncertainty). Lightcurve data is not immediately available.
Using promptly downlinked data we find an uncatalogued X-ray source
with an enhanced position: RA, Dec 38.5280, -35.3855 which is
equivalent to:
RA(J2000) = 02h 34m 06.72s
Dec(J2000) = -35d 23' 07.7"
with an uncertainty of 2.3 arcseconds (radius, 90% containment). This
position is 113.4 arcsec from the BAT position. This position may be
improved as more data are received; the latest position is available at
http://www.swift.ac.uk/sper.
We cannot determine whether the source is fading at the present time.
A power-law fit to a spectrum formed from promptly downlinked event
data gives a column density consistent with the Galactic value of 3.41
x 10^20 cm^-2 (Willingale et al. 2013).
UVOT took a finding chart exposure of 150 seconds with the White
filter starting 209 seconds after the BAT trigger. The initial
2.7'x2.7' sub-image does not cover the XRT error circle. There is a candidate
afterglow in the UVOT srclist at:
RA(J2000) = 02:34:08.08 = 38.527964
DEC(J2000) = +35:23:08.8 = -35.385784
with a 90%-confidence error radius of about 0.61 arc sec. This position is 1.06
arc sec. from the center of the XRT error circle. The estimated magnitude is
17.34 with a 1-sigma error of about 0.04. No correction has been made for the
expected extinction.
Burst Advocate for this burst is T. N. Ukwatta (tilan.ukwatta AT gmail.com).
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 18523 table |
|---|
| GRB_name |
GRB151029A |
| GCN_number |
18523 |
| Detection_method |
Other |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 18523
SUBJECT: GRB 151029A: GROND afterglow observations
DATE: 15/10/29 09:15:29 GMT
FROM: Thomas Kruehler at MPE Garching
F. Knust, J. Bolmer, T. Kruehler (all MPE Garching), S. Schmidl
(TLS Tautenburg) and J. Greiner (MPE Garching) report:
We observed the field of GRB 151029A (Swift trigger 662086,
Ukwatta et al., GCN 18522) simultaneously in g'r'i'z'JHK
with GROND (Greiner et al. 2008, PASP 120, 405) mounted at
the 2.2m MPG telescope at ESO La Silla Observatory (Chile).
Observations started at October 29, 2015, 08:33, about
40 minutes after the GRB trigger. Inside the X-ray error
(Ukwatta et al., GCN 18522) circle we detect the UVOT
counterparts at coordinates
RA: 02:34:06.75
Decl: -35:23:08.6
with an error of around 0".5.
At a mean time of October 29, 2015, 08:37 UTC, we measure
the following preliminary AB magnitudes and upper limits of:
g' = 19.9 +- 0.1
r' = 19.7 +- 0.1
i' = 19.7 +- 0.1
z' = 19.7 +- 0.1
J = 19.5 +- 0.2
H > 19.4
K > 19.4
Magnitudes and upper limts are calibrated against GROND zeropoints
and 2MASS field stars and are not corrected for the Galactic
extinction corresponding to a reddening of E_B-V = 0.018 mag
(Schlafly & Finkbeiner 2011) in the direction of the burst.
|
| GCN 18524 table |
|---|
| GRB_name |
GRB151029A |
| GCN_number |
18524 |
| Detection_method |
Optical |
| redshift |
2.0000 |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 18524
SUBJECT: GRB 151029A VLT/X-shooter redshift
DATE: 15/10/29 10:48:11 GMT
FROM: Nial Tanvir at U.Leicester
Nial R. Tanvir (Univ. Leicester), Thomas Kruehler (MPE), Daniele
Malesani (DARK/NBI), Dong Xu (NAOC/CAS), Antonio de Ugarte Postigo
(IAA-CSIC), Giovanna Pugliese (API/UvA) report on behalf of
a larger collaboration:
We observed the optical counterpart of GRB 151029A (Ukwatta et al., GCN
18522; Knust et al., GCN 18523) using the ESO Very Large Telescope UT2
equipped with the X-shooter spectrograph. Observations started on Oct
29.369 UT (1.02 hr after the GRB), that is at the end of the Chilean
night, and were extended over twilight.
The optical counterpart (Ukwatta et al., GCN 18522; Knust et al., GCN
18523) is clearly detected in our grz acquisition images.
We detect a faint continuum throughout the spectral range of
our observations, from about 3300A to 18000A, indicating
an upper limit to the redshift of z~2. We also detect several
weak absorption features that would be consistent with being
MgII (2796/2804) and FeII (2344/2587/2600) lines at z=1.423,
which we therefore report as the likely redshift for this GRB.
We acknowledge expert support from the ESO observing staff, in
particular Thomas Rivinius and Marcela Espinoza.
|
| GCN 18526 table |
|---|
| GRB_name |
GRB151029A |
| GCN_number |
18526 |
| Detection_method |
Swift-XRT Det |
| ra |
38.5278° |
| decl |
-35.3855° |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 18526
SUBJECT: GRB 151029A: Enhanced Swift-XRT position
DATE: 15/10/29 12:08:13 GMT
FROM: Phil Evans at U of Leicester
A.P. Beardmore, P.A. Evans, M.R. Goad and J.P. Osborne (U. Leicester)
report on behalf of the Swift-XRT team.
Using 789 s of XRT Photon Counting mode data and 2 UVOT
images for GRB 151029A, we find an astrometrically corrected X-ray
position (using the XRT-UVOT alignment and matching UVOT field sources
to the USNO-B1 catalogue): RA, Dec = 38.52779, -35.38553 which is equivalent
to:
RA (J2000): 02h 34m 6.67s
Dec (J2000): -35d 23' 07.9"
with an uncertainty of 2.0 arcsec (radius, 90% confidence).
This position may be improved as more data are received. The latest
position can be viewed at http://www.swift.ac.uk/xrt_positions. Position
enhancement is described by Goad et al. (2007, A&A, 476, 1401) and Evans
et al. (2009, MNRAS, 397, 1177).
This circular was automatically generated, and is an official product of the
Swift-XRT team.
|
| GCN 18527 table |
|---|
| GRB_name |
GRB151029A |
| GCN_number |
18527 |
| Detection_method |
Swift-BAT Det |
| ra |
38.5370° |
| decl |
-35.3560° |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 18527
SUBJECT: GRB 151029A: Swift-BAT refined analysis
DATE: 15/10/29 12:22:22 GMT
FROM: Scott Barthelmy at NASA/GSFC
M. Stamatikos (OSU), S. D. Barthelmy (GSFC), J. R. Cummings (GSFC/UMBC),
N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), A. Y. Lien (GSFC/UMBC),
C. B. Markwardt (GSFC), D. M. Palmer (LANL), T. Sakamoto (AGU), T. N. Ukwatta (LANL)
(i.e. the Swift-BAT team):
Using the data set from T-60 to T+243 sec from the recent telemetry downlink,
we report further analysis of BAT GRB 151029A (trigger #662086)
(Ukwatta, et al., GCN Circ. 18522). The BAT ground-calculated position is
RA, Dec = 38.537, -35.356 deg, which is
RA(J2000) = 02h 34m 09.0s
Dec(J2000) = -35d 21' 21.7"
with an uncertainty of 1.8 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 41%.
The mask-weighted light curve shows two overlapping peaks starting
at ~T-2 sec, peaking at ~T+1 se, and ending at ~T+10 sec.
T90 (15-350 keV) is 8.95 +- 2.32 sec (estimated error including systematics).
The time-averaged spectrum from T-1.10 to T+10.47 sec is best fit by a power law
with an exponential cutoff. This fit gives a photon index 0.49 +- 1.08,
and Epeak of 33.9 +- 6.9 keV (chi squared 53.8 for 56 d.o.f.). For this
model the total fluence in the 15-150 keV band is 3.9 +- 0.6 x 10^-7 erg/cm2
and the 1-sec peak flux measured from T-0.15 sec in the 15-150 keV band is
1.8 +- 0.3 ph/cm2/sec. A fit to a simple power law gives a photon index
of 2.16 +- 0.19 (chi squared 64.3 for 57 d.o.f.). All the quoted errors
are at the 90% confidence level.
The results of the batgrbproduct analysis are available at
http://gcn.gsfc.nasa.gov/notices_s/662086/BA/
|
| GCN 18530 table |
|---|
| GRB_name |
GRB151029A |
| GCN_number |
18530 |
| Detection_method |
Optical |
| ra |
38.5420° |
| decl |
-35.4038° |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 18530
SUBJECT: GRB 151029A: LCOGT-FTS afterglow observations
DATE: 15/10/29 15:42:47 GMT
FROM: Cristiano Guidorzi at Ferrara U,Italy
S. Dichiara (U. Ferrara, ICRANet), C. Guidorzi (U. Ferrara), S.
Kobayashi (LJMU), A. Gomboc (U. Ljubljana) on behalf of a larger
collaboration report:
The 2-m LCOGT Faulkes Telescope South began observing Swift GRB 151029A
(Ukwatta et al. GCN 18522) on October 29, 09:33 UT (1.7 hours after the
burst trigger) with SDSS R and I filters. We marginally detect the
optical afterglow (Ukwatta et al. GCN 18522; Knust et al. GCN 18523;
Tanvir et al. GCN 18524) due to poor sky conditions with the following
magnitudes:
Mid Time Exposure Filter Magnitude
(hours) (s)
-------------------------------------------------------
1.8 5x120 R 20.6 +- 0.4
2.0 5x120 I 21.0 +- 0.5
-------------------------------------------------------
Calibration is done against nearby USNOB-1 star RA(J2000)=02:34:10.069,
DEC(J2000)=-35:24:13.54, assuming R2=16.95 mag and I=17.63 mag.
|
| GCN 18531 table |
|---|
| GRB_name |
GRB151029A |
| GCN_number |
18531 |
| Detection_method |
Swift-UVOT Det |
| ra |
38.5280° |
| decl |
-35.3857° |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 18531
SUBJECT: GRB 151029A: Swift/UVOT Detection
DATE: 15/10/29 19:51:56 GMT
FROM: Samantha Oates at MSSL
S. R. Oates (IAA-CSIC/UCL-MSSL) and T. N. Ukwatta (LANL)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 151029A
92 s after the BAT trigger (Ukwatta et al., GCN Circ. 18522).
A source consistent with the XRT position (Beardmore et al., GCN Circ. 18526)
is detected in the initial UVOT exposures.
The preliminary UVOT position is:
RA (J2000) = 02:34:06.72 = 38.52799 (deg.)
Dec (J2000) = -35:23:08.6 = -35.38573 (deg.)
with an estimated uncertainty of 0.42 arc sec. (radius, 90% confidence).
Preliminary detections and 3-sigma upper limits using the UVOT photometric system
(Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the early exposures are:
Filter T_start(s) T_stop(s) Exp(s) Mag
white 92 242 147 16.98 +/- 0.03
v 634 653 19 17.66 +/- 0.32
b 560 752 39 19.24 +/- 0.33
u 304 554 246 17.35 +/- 0.06
w1 683 703 19 >17.98
m2 658 850 39 >18.17
w2 609 802 39 >18.64
The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.02 in the direction of the burst
(Schlegel et al. 1998).
|
| GCN 18532 table |
|---|
| GRB_name |
GRB151029A |
| GCN_number |
18532 |
| Detection_method |
Swift-XRT Other |
| redshift |
1.4230 |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 18532
SUBJECT: GRB 151029A: Swift-XRT refined Analysis
DATE: 15/10/29 20:49:02 GMT
FROM: Phil Evans at U of Leicester
A. D'ai (INAF-IASFPA), A. Maselli (INAF-IASFPA), J.A. Kennea (PSU), B.
Sbarufatti (INAF-OAB/PSU), D.N. Burrows (PSU), A.P. Beardmore (U.
Leicester), P.A. Evans (U. Leicester), S.L. Gibson (U. Leicester), A.
Melandri (INAF-OAB) and T.N. Ukwatta report on behalf of the Swift-XRT
team:
We have analysed 15 ks of XRT data for GRB 151029A (Ukwatta et al. GCN
Circ. 18522), from 106 s to 35.4 ks after the BAT trigger. The data
comprise 23 s in Windowed Timing (WT) mode with the remainder in Photon
Counting (PC) mode. The enhanced XRT position for this burst was given
by Beardmore et al. (GCN Circ. 18526).
The light curve can be modelled with a power-law decay with a decay
index of alpha=1.08 (+/-0.06).
A spectrum formed from the PC mode data can be fitted with an absorbed
power-law with a photon spectral index of 2.30 (+0.31, -0.29). The
best-fitting absorption column is 3.0 (+3.7, -3.0) x 10^21 cm^-2, at a
redshift of 1.423, in addition to the Galactic value of 3.4 x 10^20
cm^-2 (Willingale et al. 2013). The counts to observed (unabsorbed)
0.3-10 keV flux conversion factor deduced from this spectrum is 2.9 x
10^-11 (3.6 x 10^-11) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
Galactic foreground: 3.4 x 10^20 cm^-2
Intrinsic column: 3.0 (+3.7, -3.0) x 10^21 cm^-2 at z=1.423
Photon index: 2.30 (+0.31, -0.29)
If the light curve continues to decay with a power-law decay index of
1.08, the count rate at T+24 hours will be 8.0 x 10^-4 count s^-1,
corresponding to an observed (unabsorbed) 0.3-10 keV flux of 2.3 x
10^-14 (2.9 x 10^-14) erg cm^-2 s^-1.
The results of the XRT-team automatic analysis are available at
http://www.swift.ac.uk/xrt_products/00662086.
This circular is an official product of the Swift-XRT team.
|
| GCN 18534 table |
|---|
| GRB_name |
GRB151029A |
| GCN_number |
18534 |
| Detection_method |
MITSuME |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 18534
SUBJECT: GRB 151029A: MITSuME Ishigakijima upper limits
DATE: 15/10/30 05:19:18 GMT
FROM: Daisuke Kuroda at OAO/NAOJ
D. Kuroda (OAO, NAOJ), H. Hanayama, T. Miyaji, J. Watanabe (IAO, NAOJ),
K. Yanagisawa (OAO, NAOJ), S.Nagayama (NAOJ), M. Yoshida (Hiroshima),
K. Ohta (Kyoto) and N. Kawai(Tokyo Tech)
report on behalf of the MITSuME and OISTER collaboration:
We observed the field of GRB 151029A (Ukwatta et al., GCNC 18522)
with the optical three color (g', Rc and Ic) CCD camera attached
to the Murikabushi 1m telescope of Ishigakijima Astronomical
Observatory.
The observation started on 2015-10-29 14:56:55 UT (~6.5h after
the burst). We could not detect the previously reported afterglow
(Ukwatta et al., GCNC 18522; Knust et al., GCNC 18523;
Tanvir et al., GCNC 18524) in all the three bands.
Three sigma upper limits of the OT are listed below.
We used GSC2.3 catalog for flux calibration.
#T0+[day] MID-UT T-EXP[sec] g' Rc Ic
-----------------------------------------------------
0.31392 15:56:55 5760.0 >20.5 >20.7 >19.8
-----------------------------------------------------
T0+ : Elapsed time after the burst [day]
T-EXP: Total Exposure time [sec]
|
| GCN 18535 table |
|---|
| GRB_name |
GRB151029A |
| GCN_number |
18535 |
| Detection_method |
Swift Other |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 18535
SUBJECT: Correction to the Trigger Time for Swift GRB 151029A
DATE: 15/10/30 12:54:17 GMT
FROM: Scott Barthelmy at NASA/GSFC
S. Barthelmy and F. Marshall (GSFC) on behalf of the Swift team:
In GCN Circular 18522, we stated that the trigger time for GRB 151029A
was 07:49:54 UT, but with the full data set downlinked, the correct trigger time
is 07:49:39 UT. The correction for the on-board clock drift had not
been applied in the original Circular due to the lack of some of the
real-time TDRSS downlinked data. We apologise for any inconvenience.
|
| GCN 18554 table |
|---|
| GRB_name |
GRB151029A |
| GCN_number |
18554 |
| Detection_method |
Optical |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 18554
SUBJECT: GRB 151029A: FRAM optical afterglow detection
DATE: 15/11/03 13:42:46 GMT
FROM: Martin Jelinek at Astro.Inst.ASU-AVCR,Ondrejov
Martin Jelinek (Astronomical Institute ASU-AVCR Ondrejov),
Michael Prouza, Jan Ebr, Petr Janecek, Martin Masek
(Institute of Physics FZU-CAS Praha) and
Samantha Oates (IAA CSIC Granada + UCL MSSL)
"The 0.30m robotic telescope FRAM located in Malargue,
Argentina, observed the reported location of GRB 151029A
(Ukwatta GCNC 18522) starting 884s after the corrected
trigger time (Barthelmy GCNC 18535), 8.9s after receiving
the trigger.
The telescope obtained a 30 minute set of unfiltered
exposures. The optical afterglow (Oates GCNC 18531,
Knust GCNC 18523, Tanvir GCNC 18524) can be detected
on combined exposures.
In the first combined image, with the mean time of individual
exposures 08:07:27 UT (1068s post trigger), we measure
magnitude 17.7 +/- 0.2. The calibration was done with three
nearby USNO-B2.0 stars."
|