GRB 141031B
GCN Circular 16998
Subject
GRB 141031B: Swift detection of a burst
Date
2014-10-31T15:10:05Z (11 years ago)
From
David Palmer at LANL <palmer@lanl.gov>
B.P. Gompertz (U Leicester), J. R. Cummings (NASA/UMBC),
V. D'Elia (ASDC), P. A. Evans (U Leicester), N. Gehrels (NASA/GSFC),
H. A. Krimm (CRESST/GSFC/USRA), K. L. Page (U Leicester),
D. M. Palmer (LANL), B. Sbarufatti (INAF-OAB/PSU) and
M. H. Siegel (PSU) report on behalf of the Swift Team:
At 14:56:45 UT, the Swift Burst Alert Telescope (BAT) triggered and
located GRB 141031B (trigger=617149). Swift slewed immediately to the burst.
The BAT on-board calculated location is
RA, Dec 356.932, +41.365 which is
RA(J2000) = 23h 47m 44s
Dec(J2000) = +41d 21' 56"
with an uncertainty of 3 arcmin (radius, 90% containment, including
systematic uncertainty). The BAT light curve showed a single-peaked
structure with a duration of about 20 sec. The peak count rate
was ~500 counts/sec (15-350 keV), at ~5 sec after the trigger.
The XRT began observing the field at 14:58:42.5 UT, 117.5 seconds after
the BAT trigger. Using promptly downlinked data we find an uncatalogued
X-ray source with an enhanced position: RA, Dec 356.9056, 41.3519 which
is equivalent to:
RA(J2000) = 23h 47m 37.33s
Dec(J2000) = +41d 21' 07.0"
with an uncertainty of 2.6 arcseconds (radius, 90% containment). This
location is 85 arcseconds from the BAT onboard position, within the BAT
error circle. 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 1.22
x 10^21 cm^-2 (Willingale et al. 2013).
UVOT took a finding chart exposure of 150 seconds with the White filter
starting 119 seconds after the BAT trigger. No credible afterglow candidate has
been found in the initial data products. The 2.7'x2.7' sub-image covers 100% of
the XRT error circle. The typical 3-sigma upper limit has been about 19.6 mag.
The 8'x8' region for the list of sources generated on-board covers 100% of the
BAT error circle. The list of sources is typically complete to about 18 mag. No
correction has been made for the expected extinction corresponding to E(B-V) of
0.15.
Burst Advocate for this burst is B.P. Gompertz (bpg6 AT le.ac.uk).
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 16999
Subject
GRB 141031B: MASTER early optical observations
Date
2014-10-31T15:23:47Z (11 years ago)
From
Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>
K.Ivanov, S.Yazev, N.M.Budnev, O.Gres, O.Chuvalaev, V.A.Poleshchuk
Irkutsk State University
E. Gorbovskoy, V. Lipunov, M.Pruzhinskaya, V.Kornilov, D.Kuvshinov,
N.Tyurina, N.Shatskiy, P.Balanutsa, D.Zimnukhov, A.Kuznetsov, V.V.Chazov,
D.Denisenko, A.Sankovich
Lomonosov Moscow State University,
Sternberg Astronomical Institute, Moscow State University
V.Yurkov, Yu.Sergienko, D.Varda, E.Sinyakov
Blagoveschensk Educational State University, Blagoveschensk
A. Tlatov, A.V. Parhomenko, D. Dormidontov, V.Sennik
Kislovodsk Solar Station of the Pulkovo Observatory
V.Krushinsky, I.Zalozhnih, A. Popov
Ural Federal University, Yekaterinburg, Kourovka
Hugo Levato and Carlos Saffe
Instituto de Ciencias Astronomicas, de la Tierra y del Espacio (ICATE)
Claudio Mallamaci, Carlos Lopez and Federico Podest
Observatorio Astronomico Felix Aguilar (OAFA)
MASTER II robotic telescope (MASTER-Net: http://observ.pereplet.ru)
located in Tunka was pointed to the GRB141031B 33 sec after notice time
and 88 sec after trigger time at 2014-10-31 14:58:13 UT in two
polarizations. On our first (20s exposure) set we haven`t found optical
transient within SWIFT error-box (Gompertz et al GCN 16998).
The 5-sigma upper limit has been about 16.0 mag
MASTER II robotic telescope located in Kislovodsk was pointed to the
GRB141031B 23 sec after notice time and 77 sec after trigger time at
2014-10-31 14:58:03 UT in two polarizations. On our first (20s exposure)
set we haven`t found optical transient within SWIFT error-box. The
5-sigma upper limit has been about 15.5 mag.
The message may be cited.
GCN Circular 17000
Subject
GRB 141031B: Nanshan optical upper limit
Date
2014-10-31T16:33:01Z (11 years ago)
From
Dong Xu at DARK/NBI <dong.dark@gmail.com>
D. Xu (DARK/NBI), C.-H. Bai, T.-Z. Yang, A. Esamdin, L. Ma (XAO) report:
We observed the field of GRB 141031B (Gompertz et al., GCN 16998),
using the 1m telescope located at Nanshan, Xinjiang, China. We
obtained 2x300s and 1x600s R-band images, starting at 16:02:08 UT on
2014-10-31 (i.e., 1.090 hr after the burst).
No optical source is detected at the XRT position (R.A.=23:47:37.24,
Dec.=+41:21:07.7, Err. Rad.=2.4"), down to a limiting magnitude of
R=20.6 mag.
GCN Circular 17006
Subject
GRB 141031B: 1.23m CAHA I-band observations
Date
2014-10-31T19:40:47Z (11 years ago)
From
Javier Gorosabel at IAA-CSIC <jgu@iaa.es>
J. Gorosabel (IAA-CSIC/UPV-EHU), S. Hellmich (DLR), S. Mottola (DLR),
report on behalf of a larger collaboration:
We observed the field of the GRB 141031B (Gompertz et al., GCN 16998) with
the 1.23m CAHA telescope in the I-band filter. Observations started on
Oct. 31.74693 UT (2.98 hours post burst). No object brighter than I~20.5
(Vega) is detected within the XRT error circle. Further observations are
ongoing.
GCN Circular 17007
Subject
GRB 141031B: TShAO optical upper limit
Date
2014-10-31T20:03:58Z (11 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
E. Mazaeva (IKI), A. Khruslov (INASAN), A. Volnova (IKI), A. Pozanenko
(IKI) report on behalf of larger GRB follow-up collaboration:
We observed the field of the GRB 141031B (Gompertz et al., GCN 16998)
with Zeiss-1000 (East) 1m telescope of Tien Shan Astronomical
Observatory on Oct., 31 starting on (UT) 15:39:02, i.e. ~0.7 hours
after burst trigger. We took several images in R-filter of 600 exposure.
In the first image we do not detect any object brighter than R=21.5 in
XRT error circle (Gompertz et al., GCN 16998).
Details of the photometry are following:
date UT start t-T0 Filter Exp. UL (3 sigma)
(mid, days) (s)
2014-10-31 15:39:02 0.03284 R 600 21.5
The photometry is based on nearby SDSS DR9 stars.
GCN Circular 17009
Subject
GRB 141031B: Enhanced Swift-XRT position
Date
2014-10-31T21:02:11Z (11 years ago)
From
Phil Evans at U of Leicester <pae9@leicester.ac.uk>
M.R. Goad, J.P. Osborne, A.P. Beardmore and P.A. Evans (U. Leicester)
report on behalf of the Swift-XRT team.
Using 712 s of XRT Photon Counting mode data and 1 UVOT
images for GRB 141031B, 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 = 356.90499, +41.35253 which is equivalent
to:
RA (J2000): 23h 47m 37.20s
Dec (J2000): +41d 21' 09.1"
with an uncertainty of 1.9 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 Circular 17011
Subject
GRB 141031B: Swift-BAT refined analysis
Date
2014-10-31T23:49:19Z (11 years ago)
From
Jay R. Cummings at NASA/GSFC/Swift <james.r.cummings@nasa.gov>
S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), 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),
M. Stamatikos (OSU), J. Tueller (GSFC), T. N. Ukwatta (LANL)
(i.e. the Swift-BAT team):
Using the data set from T-240 to T+962 sec from the recent telemetry downlink,
we report further analysis of BAT GRB 141031B (trigger #617149) (Gompertz, et al.,
GCN Circ. 16998). The BAT ground-calculated position is
RA, Dec = 356.883, 41.355 deg which is
RA(J2000) = 23h 47m 31.9s
Dec(J2000) = +41d 21' 19.1"
with an uncertainty of 2.2 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 100%.
The mask-weighted light curve shows one weak FRED peak. T90 (15-350 keV) is
16.0 +- 3.6 sec (estimated error including systematics).
The time-averaged spectrum from T+1.21 to T+18.21 sec is best fit by a simple
power-law model. The power law index of the time-averaged spectrum is
1.36 +- 0.35. The fluence in the 15-150 keV band is 2.5 +- 0.5 x 10^-07 erg/cm2.
The 1-sec peak photon flux measured from T+4.21 sec in the 15-150 keV band
is 0.3 +- 0.1 ph/cm2/sec. 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/617149/BA/
GCN Circular 17012
Subject
GRB 141031B: MITSuME Ishigakijima upper limits
Date
2014-11-01T01:40:01Z (11 years ago)
From
Daisuke Kuroda at OAO/NAOJ <dikuroda@oao.nao.ac.jp>
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 141031B (Gompertz et al., GCNC 16998)
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 2014-10-31 15:02:03 (~5.3 min after the burst).
We did not find any new point source within the enhanced XRT circle
(Osborne et al., GCNC 17009) in all the three bands.
Three sigma upper limits of the OT are listed below.
We used SDSS catalog for flux calibration.
#T0+[day] MID-UT T-EXP[sec] g' Rc Ic
-----------------------------------------------------
0.04563 16:02:27 6120.0 >22.6 >22.4 >21.3
-----------------------------------------------------
T0+ : Elapsed time after the burst [day]
T-EXP: Total Exposure time [sec]
GCN Circular 17013
Subject
GRB 141031B: NOT optical observations
Date
2014-11-01T01:53:00Z (11 years ago)
From
Daniele Malesani at Dark Cosmology Centre, Niels Bohr Inst <malesani@dark-cosmology.dk>
Daniele Malesani (DARK/NBI) and Vania Lorenzi (INAF/TNG) report on
behalf of the CIBO collaboration:
We observed the field of GRB 141031B (Gompertz et al., GCN 16998) with
the Nordic Optical Telescope (NOT) equipped with StanCam. Observations
were carried out in the Johnson R (9x300 s) and SDSS z (6x300 s) filters
under moderate weather conditions (1.5" seeing).
No objects are detected in either bands within the refined X-ray
position (Goad et al., GCN 17009), down to limiting magnitudes of R =
22.5 (Vega) and z = 21.5 (AB), with mean times 7.93 and 8.48 hr after
the GRB (calibration against USNO B1 and SDSS, respectively).
GCN Circular 17014
Subject
GRB 141031B: Bassano Bresciano Observatory upper limit
Date
2014-11-01T07:20:56Z (11 years ago)
From
Ulisse Quadri at Bassano Bresciano Obs <oabb@ulisse.bs.it>
U.Quadri, L.Strabla and R.Girelli report:
We imaged the field of GRB 141031B detected by SWIFT(trigger 617149)
with the robotic telescope of (IAU station 565) Bassano Bresciano
Observatory, Italy (member of ISSP:Italian Supernovae Search Project)
The observations started 2.16 hour after the GRB trigger, at the end of twilight,
with our schmidt telescope D=320/400 mm F/D=3.1.
Weather conditions were good.
We did not found any optical counterpart
in the error box of the XRTcandidate.
(B.P. Gompertz (U Leicester) et al, GCN 16998)
Start T0+ End T0+ Vlim
2.16 hour 4.48 hour 18
Magnitudes were estimated with the USNO-B1.0 cat.
and are not corrected for galactic dust extinction.
The message may be cited.
GCN Circular 17015
Subject
GRB 141031B: Swift-XRT refined Analysis
Date
2014-11-01T09:10:31Z (11 years ago)
From
Phil Evans at U of Leicester <pae9@leicester.ac.uk>
V. Mangano (PSU), M.C. Stroh (PSU), D.N. Burrows (PSU), J.P. Osborne
(U. Leicester), K.L. Page (U. Leicester), C. Pagani (U. Leicester), A.
Maselli (INAF-IASFPA), A. Melandri (INAF-OAB), B. Sbarufatti
(INAF-OAB/PSU) and B.P. Gompertz report on behalf of the Swift-XRT
team:
We have analysed 12 ks of XRT data for GRB 141031B (Gompertz et al.
GCN Circ. 16998), from 126 s to 51.8 ks after the BAT trigger. The
data are entirely in Photon Counting (PC) mode. The enhanced XRT
position for this burst was given by Goad et al. (GCN Circ. 17009).
The light curve can be modelled with a power-law decay with a decay
index of alpha=0.84 (+0.09, -0.08).
A spectrum formed from the PC mode data can be fitted with an absorbed
power-law with a photon spectral index of 1.8 (+/-0.4). The
best-fitting absorption column is 5.5 (+2.5, -2.7) x 10^21 cm^-2, in
excess of the Galactic value of 1.2 x 10^21 cm^-2 (Willingale et al.
2013). The counts to observed (unabsorbed) 0.3-10 keV flux conversion
factor deduced from this spectrum is 4.6 x 10^-11 (6.8 x 10^-11) erg
cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
Total column: 5.5 (+2.5, -2.7) x 10^21 cm^-2
Galactic foreground: 1.2 x 10^21 cm^-2
Excess significance: 2.6 sigma
Photon index: 1.8 (+/-0.4)
If the light curve continues to decay with a power-law decay index of
0.84, the count rate at T+24 hours will be 1.5 x 10^-3 count s^-1,
corresponding to an observed (unabsorbed) 0.3-10 keV flux of 6.9 x
10^-14 (1.0 x 10^-13) erg cm^-2 s^-1.
The results of the XRT-team automatic analysis are available at
http://www.swift.ac.uk/xrt_products/00617149.
This circular is an official product of the Swift-XRT team.
GCN Circular 17017
Subject
GRB 141031B: Swift/UVOT Upper Limits
Date
2014-11-01T11:09:58Z (11 years ago)
From
Samantha Oates at MSSL <sro@mssl.ucl.ac.uk>
S. R. Oates (IAA-CSIC/UCL-MSSL) and B. P. Gompertz (U Leicester)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 141031B
120 s after the BAT trigger (Gompertz et al., GCN Circ. 16998).
No optical afterglow consistent with the XRT position
(Goad et al. GCN Circ. 17009)
is detected in the initial UVOT exposures.
Preliminary 3-sigma upper limits using the UVOT photometric system
(Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the first
finding chart (FC) exposure and subsequent exposures are:
Filter T_start(s) T_stop(s) Exp(s) Mag
white_FC 120 270 147 >21.0
u_FC 278 528 246 >20.3
white 120 6181 580 >21.8
v 608 11035 1317 >20.6
b 534 5976 432 >20.9
u 278 5771 659 >20.9
w1 658 12348 620 >20.7
m2 633 11940 1121 >20.9
w2 584 6386 432 >20.5
The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.14 in the direction of the burst
(Schlegel et al. 1998).
GCN Circular 17018
Subject
GRB 141031B: RATIR Optical and NIR Observation
Date
2014-11-01T16:05:34Z (11 years ago)
From
Nat Butler at UC berkeley <natxbutler@gmail.com>
Nat Butler (ASU), Alan M. Watson (UNAM), Alexander Kutyrev (GSFC), William
H. Lee (UNAM), Michael G. Richer (UNAM), Chris Klein (UCB), Ori Fox (UCB),
J. Xavier Prochaska (UCSC), Josh Bloom (UCB), Antonino Cucchiara
(ORAU/GSFC), Eleonora Troja (GSFC), Owen Littlejohns (ASU), Enrico
Ramirez-Ruiz (UCSC), Jos�� A. de Diego (UNAM), Leonid Georgiev (UNAM), Jes��s
Gonz��lez (UNAM), Carlos Rom��n-Z����iga (UNAM), Neil Gehrels (GSFC), and
Harvey Moseley (GSFC) report:
We observed the field of GRB 141031B (Gompertz, et al., GCN 16998) with the
Reionization and Transients Infrared Camera (RATIR; www.ratir.org) on the
1.5m Harold Johnson Telescope at the Observatorio Astron��mico Nacional on
Sierra San Pedro M��rtir from 2014/11 1.10 to 2014/11 1.11 UTC (11.34 to
11.75 hours after the BAT trigger), obtaining a total of 0.36 hours
exposure in the r, i, and z bands.
For a source within the enhanced Swift-XRT error circle (Goad, et al., GCN
17009), in comparison with the SDSS DR9, we obtain the following upper
limits (3-sigma):
r > 22.98
i > 22.81
z > 19.91
These magnitudes are in the AB system and are not corrected for Galactic
extinction in the direction of the GRB.
We thank the staff of the Observatorio Astron��mico Nacional in San Pedro
M��rtir.
GCN Circular 17029
Subject
GRB 141031B: TShAO optical observations
Date
2014-11-05T19:27:48Z (11 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
E. Mazaeva (IKI), A. Volnova (IKI), A. Khruslov (INASAN), A. Kusakin
(Fesenkov Astrophysical Institute), A. Pozanenko (IKI) report on behalf
of larger GRB follow-up collaboration:
We observed the field of the GRB 141031B (Gompertz et al., GCN 16998)
with Zeiss-1000 (East) 1m telescope of Tien Shan Astronomical
Observatory on Oct., 31 starting on (UT) 15:39:02. Within enhanced XRT
error circle (Goad et al., GCN 17009) we do not detect any object
either in a single image (Mazaeva et al., GCN 17007) or in combined
image of a total exposure of 4800 s.
Details of the photometry are following:
date UT start t-T0 Filter Exp. UL (3 sigma)
(mid, days) (s)
2014-10-31 15:39:02 0.03284 R 600 21.5
2014-10-31 15:39:02 0.05837 R 8*600 22.3
The photometry is based on following SDSS DR9 stars:
SDSS_id R_Lupton err
J234748,81+411954,3 16.430 0.014
J234749,26+412154,3 16.866 0.014
J234741,02+411920,5 17.452 0.015