| Summary table |
|---|
| Variable |
Value |
Source |
| T0 |
9:59:34 UTC |
GCN_circulars,Swift Det |
| ra |
120.9430° |
Swift |
| decl |
-61.0278° |
Swift |
| pos_error |
5.82e-05° |
Swift |
| T90 |
4.86 s |
Swift |
| T90_start |
9:59:34 UTC |
Swift |
| fluence |
3.70e-07 erg/cm² |
Swift |
| T100 |
4.86 s |
|
| GBM_located |
False |
|
| mjd |
57340.41636574074 |
GCN_circulars,Swift Det |
| IPN table |
|---|
| GRB_name |
GRB151114A |
| ra |
120.9375° |
| decl |
-61.0500° |
| pos_error |
5.00e-02° |
| Swift table |
|---|
| GRB_name |
GRB151114A |
| t_trigger |
9:59:34 UTC |
| ra |
120.9430° |
| decl |
-61.0278° |
| pos_error |
5.82e-05° |
| T90 |
4.86 s |
| fluence |
3.70e-07 erg/cm² |
| GCN 18599 table |
|---|
| GRB_name |
GRB151114A |
| GCN_number |
18599 |
| Detection_method |
Swift Det |
| t_trigger |
9:59:34 UTC |
| ra |
120.9370° |
| decl |
-61.0420° |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 18599
SUBJECT: GRB 151114A: Swift detection of a burst with an optical counterpart
DATE: 15/11/14 10:12:35 GMT
FROM: Scott Barthelmy at NASA/GSFC
M. H. Siegel (PSU), S. D. Barthelmy (GSFC), N. P. M. Kuin (UCL-MSSL),
L. M. McCauley (PSU) and B. Sbarufatti (INAF-OAB/PSU) report on behalf
of the Swift Team:
At 09:59:34 UT, the Swift Burst Alert Telescope (BAT) triggered and
located GRB 151114A (trigger=663490). Swift slewed immediately to the burst.
The BAT on-board calculated location is
RA, Dec 120.937, -61.042, which is
RA(J2000) = 08h 03m 45s
Dec(J2000) = -61d 02' 31"
with an uncertainty of 3 arcmin (radius, 90% containment, including
systematic uncertainty). The BAT light curve shows a couple peaks
with a duration of about 20 sec. The peak count rate
was ~2000 counts/sec (15-350 keV), at ~0 sec after the trigger.
The XRT began observing the field at 10:01:03.9 UT, 89.8 seconds after
the BAT trigger. Using promptly downlinked data we find an uncatalogued
X-ray source located at RA, Dec 120.94436, -61.02743 which is
equivalent to:
RA(J2000) = 08h 03m 46.65s
Dec(J2000) = -61d 01' 38.7"
with an uncertainty of 3.7 arcseconds (radius, 90% containment). This
location is 53 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 2.01
x 10^21 cm^-2 (Willingale et al. 2013).
UVOT took a finding chart exposure of 150 seconds with the White filter
starting 94 seconds after the BAT trigger. There is a candidate afterglow in
the rapidly available 2.7'x2.7' sub-image at
RA(J2000) = 08:03:46.33 = 120.94305
DEC(J2000) = -61:01:40.0 = -61.02779
with a 90%-confidence error radius of about 0.63 arc sec. This position is 1.4
arc sec. from the center of the XRT error circle. The estimated magnitude is
18.84 with a 1-sigma error of about 0.15. No correction has been made for the
expected extinction corresponding to E(B-V) of 0.17.
Burst Advocate for this burst is M. H. Siegel (siegel AT swift.psu.edu).
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 18600 table |
|---|
| GRB_name |
GRB151114A |
| GCN_number |
18600 |
| Detection_method |
Swift-XRT Det |
| ra |
120.9430° |
| decl |
-61.0279° |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 18600
SUBJECT: GRB 151114A: Enhanced Swift-XRT position
DATE: 15/11/14 13:56:04 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 1128 s of XRT Photon Counting mode data and 2 UVOT
images for GRB 151114A, 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 = 120.94305, -61.02792 which is equivalent
to:
RA (J2000): 08h 03m 46.33s
Dec (J2000): -61d 01' 40.5"
with an uncertainty of 1.8 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 18601 table |
|---|
| GRB_name |
GRB151114A |
| GCN_number |
18601 |
| Detection_method |
Swift-BAT Det |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 18601
SUBJECT: GRB 151114A: LCOGT-FTS afterglow observations
DATE: 15/11/14 18:33:47 GMT
FROM: Simone Dichiara at Ferrara U/Italy
S. Dichiara (U. Ferrara, ICRANet), C. Guidorzi (U. Ferrara),
A. Melandri (INAF-OAB), C.G. Mundell (U. Bath), S. Kobayashi (LJMU),
A. Gomboc (U. Ljubljana) on behalf of a large collaboration report:
The 2-m Faulkes Telescope South began observing Swift GRB 151114A
(Siegel et al. GCN 18599) on November 14, 12:18:07 UT (~2.3 hours after
the BAT trigger) with SDSS R and I filters.
we identify the optical afterglow (Siegel et al. GCN 18599) in the R
filter with R = 20.6 +/- 0.2 mag at a mid time of 2.64 hours post burst
(total exposure 600 s). The counterpart is detected also visible in
the I-band image.
Data reduction and calibration continue. The magnitude is calibrated
against nearby USNOB-1 stars (R2).
|
| GCN 18602 table |
|---|
| GRB_name |
GRB151114A |
| GCN_number |
18602 |
| Detection_method |
Swift-UVOT Det |
| ra |
120.9430° |
| decl |
-61.0278° |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 18602
SUBJECT: GRB 151114A: Swift/UVOT Detection
DATE: 15/11/14 19:34:41 GMT
FROM: Paul Kuin at MSSL
N. P. M. Kuin (UCL-MSSL) and M. H. Siegel (PSU)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 151114A
95 s after the BAT trigger (Siegel et al., GCN Circ. 18599).
A source consistent with the XRT position
(Siegel et al. GCN Circ. 18599)
is detected in the initial UVOT exposures.
The preliminary UVOT position is:
RA (J2000) = 08:03:46.33 = 120.94306 (deg.)
Dec (J2000) = -61:01:40.0 = -61.02779 (deg.)
with an estimated uncertainty of 0.45 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 95 244 147 18.61 +/- 0.06
v 638 1233 72 >18.4
b 563 1164 58 19.45 +/- 0.26
u 307 557 246 18.46 +/- 0.09
w1 688 1115 39 >18.3
m2 662 1090 58 >19.2
w2 613 1215 78 >19.2
The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.17 in the direction of the burst
(Schlegel et al. 1998).
|
| GCN 18604 table |
|---|
| GRB_name |
GRB151114A |
| GCN_number |
18604 |
| Detection_method |
Swift-BAT Det |
| ra |
120.9470° |
| decl |
-61.0330° |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 18604
SUBJECT: GRB 151114A: Swift-BAT refined analysis
DATE: 15/11/14 20:49:26 GMT
FROM: Scott Barthelmy at NASA/GSFC
A. Y. Lien (GSFC/UMBC), S. D. Barthelmy (GSFC), J. R. Cummings (GSFC/UMBC),
N. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), C. B. Markwardt (GSFC),
D. M. Palmer (LANL), T. Sakamoto (AGU), M. H. Siegel (PSU),
M. Stamatikos (OSU), 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 downlinks,
we report further analysis of BAT GRB 151114A (trigger #663490)
(Siegel, et al., GCN Circ. 18599). The BAT ground-calculated position is
RA, Dec = 120.947, -61.033 deg, which is
RA(J2000) = 08h 03m 47.4s
Dec(J2000) = -61d 01' 58.3"
with an uncertainty of 1.8 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 30%.
The mask-weighted light curve shows a single peak starting at ~T-4 sec,
peaking at ~T0 sec, and ending at ~T+1 sec. T90 (15-350 keV) is
4.86 +- 0.98 sec (estimated error including systematics).
The time-averaged spectrum from T-4.26 to T+1.25 sec is best fit by a simple
power-law model. The power law index of the time-averaged spectrum is
2.14 +- 0.25. The fluence in the 15-150 keV band is 3.7 +- 0.6 x 10^-7 erg/cm2.
The 1-sec peak photon flux measured from T-0.06 sec in the 15-150 keV band
is 2.9 +- 0.4 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/663490/BA/
|
| GCN 18606 table |
|---|
| GRB_name |
GRB151114A |
| GCN_number |
18606 |
| Detection_method |
Swift-XRT Other |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 18606
SUBJECT: GRB 151114A: Swift-XRT refined Analysis
DATE: 15/11/15 10:12:04 GMT
FROM: Phil Evans at U of Leicester
L.M. McCauley (PSU), K.L. Page (U. Leicester), C. Pagani (U.
Leicester), A.P. Beardmore (U. Leicester), V. D'Elia (ASDC), A. D'ai
(INAF-IASFPA), A. Maselli (INAF-IASFPA), J.A. Kennea (PSU), B.
Sbarufatti (INAF-OAB/PSU) and M.H. Siegel report on behalf of the
Swift-XRT team:
We have analysed 6.1 ks of XRT data for GRB 151114A (Siegel et al. GCN
Circ. 18599), from 97 s to 48.6 ks after the BAT trigger. The data are
entirely in Photon Counting (PC) mode. The enhanced XRT position for
this burst was given by Beardmore et al. (GCN Circ. 18600).
The light curve can be modelled with a power-law decay with a decay
index of alpha=0.73 (+0.05, -0.04).
A spectrum formed from the PC mode data can be fitted with an absorbed
power-law with a photon spectral index of 2.00 (+0.16, -0.12). The
best-fitting absorption column is consistent with the Galactic value
of 2.0 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 3.5 x 10^-11 (4.6 x 10^-11) erg cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
Total column: 2.0 (+/-0.3) x 10^21 cm^-2
Galactic foreground: 2.0 x 10^21 cm^-2
Excess significance: <1.6 sigma
Photon index: 2.00 (+0.16, -0.12)
If the light curve continues to decay with a power-law decay index of
0.73, the count rate at T+24 hours will be 8.2 x 10^-3 count s^-1,
corresponding to an observed (unabsorbed) 0.3-10 keV flux of 2.8 x
10^-13 (3.8 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/00663490.
This circular is an official product of the Swift-XRT team.
|
| GCN 18607 table |
|---|
| GRB_name |
GRB151114A |
| GCN_number |
18607 |
| Detection_method |
GROND |
| ra |
120.9430° |
| decl |
-61.0278° |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 18607
SUBJECT: GRB 151114A: GROND Detection of the Optical/NIR Afterglow Candidate
DATE: 15/11/15 16:10:09 GMT
FROM: Jan Bolmer at MPE/Garching
J. Bolmer, F. Knust and J. Greiner (all MPE Garching) report on behalf of
the GROND team:
We observed the field of GRB 151114A (Swift trigger 663490; Siegel et
al., GCN #18599) simultaneously in g'r'i'z'JHK with GROND (Greiner et al.
2008, PASP 120, 405) mounted at the 2.2 m MPG telescope at the ESO La
Silla Observatory (Chile).
Observations started at 04:59 UT on 2015-11-15, 19.5hrs after the GRB
trigger. They were performed at an average seeing of
1.8" and at an average airmass of 1.5.
We found a single point source within the 1.8" Swift-XRT and 0.45" Swift-UVOT error
circles reported by Beardmore et al. (GCN #18600) and Kuin et al. (GCN #18602) at
RA, Dec = 120.94299, -61.02778
RA (J2000) = 08h 03m 46.32s
DEC (J2000) = -61d 01' 40.0"
with an uncertainty of 0.3" in each coordinate.
Based on 25.2 min of total exposures in g'r'i'z' and 25.5 min in JHK, we
estimate preliminary magnitudes (all in AB system) of
g' = 23.7 +/- 0.3 mag,
r' = 23.2 +/- 0.2 mag,
i' = 23.1 +/- 0.3 mag,
z' = 23.3 +/- 0.4 mag,
J > 21.4 mag,
H > 20.9 mag, and
K > 19.5 mag.
Given magnitudes are calibrated against GROND zeropoints as well as 2MASS
field stars and are not corrected for the expected Galactic foreground
extinction corresponding to a reddening of E_(B-V)=0.17 mag in the
direction of the burst (Schlegel et al. 1998). |