| Summary table |
|---|
| Variable |
Value |
Source |
| T0 |
1:08:30 UTC |
GCN_circulars,Swift Det |
| ra |
190.4376° |
Swift |
| decl |
-61.3510° |
Swift |
| pos_error |
2.59e-04° |
Swift |
| T90 |
6.39 s |
Swift |
| T90_start |
1:08:30 UTC |
Swift |
| fluence |
1.80e-07 erg/cm² |
Swift |
| T100 |
6.39 s |
|
| GBM_located |
False |
|
| mjd |
57585.04756944445 |
GCN_circulars,Swift Det |
| IPN table |
|---|
| GRB_name |
GRB160716A |
| ra |
190.5417° |
| decl |
-61.3667° |
| pos_error |
5.00e-02° |
| Swift table |
|---|
| GRB_name |
GRB160716A |
| t_trigger |
1:08:30 UTC |
| ra |
190.4376° |
| decl |
-61.3510° |
| pos_error |
2.59e-04° |
| T90 |
6.39 s |
| fluence |
1.80e-07 erg/cm² |
| GCN 19716 table |
|---|
| GRB_name |
GRB160716A |
| GCN_number |
19716 |
| Detection_method |
Swift Det |
| t_trigger |
1:08:30 UTC |
| ra |
190.5440° |
| decl |
-61.3660° |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 19716
SUBJECT: GRB 160716A: Swift detection of a burst
DATE: 16/07/16 01:20:39 GMT
FROM: David Palmer at LANL
L. M. Z. Hagen (PSU), S. D. Barthelmy (GSFC), J. A. Kennea (PSU) and
D. M. Palmer (LANL) report on behalf of the Swift Team:
At 01:08:30 UT, the Swift Burst Alert Telescope (BAT) triggered and
located GRB 160716A (trigger=704572). Swift slewed immediately to the burst.
The BAT on-board calculated location is
RA, Dec 190.544, -61.366 which is
RA(J2000) = 12h 42m 10s
Dec(J2000) = -61d 21' 56"
with an uncertainty of 3 arcmin (radius, 90% containment, including
systematic uncertainty). The BAT light curve showed a copmplex
structure with a duration of about 10 sec. The peak count rate
was ~1500 counts/sec (15-350 keV), at ~0 sec after the trigger.
The XRT began observing the field at 01:09:55.7 UT, 85.7 seconds after
the BAT trigger. Using promptly downlinked data we find an uncatalogued
X-ray source located at RA, Dec 190.43632, -61.35080 which is
equivalent to:
RA(J2000) = 12h 41m 44.72s
Dec(J2000) = -61d 21' 02.9"
with an uncertainty of 4.0 arcseconds (radius, 90% containment). This
location is 193 arcseconds from the BAT onboard position, outside 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 9.61
x 10^21 cm^-2 (Willingale et al. 2013).
UVOT took a finding chart exposure of 150 seconds with the White filter
starting 88 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 none of
the XRT error circle. The 8'x8' region for the list of sources generated
on-board covers 100% of the XRT error circle. The list of sources is typically
complete to about 18 mag. No correction has been made for the large, but
uncertain extinction expected.
Burst Advocate for this burst is L. M. Z. Hagen (lea.zernow.hagen 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 19717 table |
|---|
| GRB_name |
GRB160716A |
| GCN_number |
19717 |
| Detection_method |
Swift-XRT Det |
| ra |
190.4375° |
| decl |
-61.3510° |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 19717
SUBJECT: GRB 160716A: Enhanced Swift-XRT position
DATE: 16/07/16 09:15:26 GMT
FROM: Phil Evans at U of Leicester
P.A. Evans, M.R. Goad, J.P. Osborne and A.P. Beardmore (U. Leicester)
report on behalf of the Swift-XRT team.
Using 666 s of XRT Photon Counting mode data and 1 UVOT
images for GRB 160716A, 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 = 190.43749, -61.35098 which is equivalent
to:
RA (J2000): 12h 41m 45.00s
Dec (J2000): -61d 21' 03.5"
with an uncertainty of 2.1 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 19718 table |
|---|
| GRB_name |
GRB160716A |
| GCN_number |
19718 |
| Detection_method |
Swift-XRT Other |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 19718
SUBJECT: GRB 160716A: Swift-XRT refined Analysis
DATE: 16/07/16 13:23:48 GMT
FROM: Phil Evans at U of Leicester
K.L. Page (U. Leicester), A. Maselli (INAF-IASFPA), A. Melandri
(INAF-OAB), P. D'Avanzo (INAF-OAB), B. Sbarufatti (INAF-OAB/PSU), D.N.
Burrows (PSU), T.G.R. Roegiers (PSU), B. Mingo (U. Leicester), A.P.
Beardmore (U. Leicester) and L.M.Z. Hagen report on behalf of the
Swift-XRT team:
We have analysed 6.7 ks of XRT data for GRB 160716A (Hagen et al. GCN
Circ. 19716), from 98 s to 24.2 ks after the BAT trigger. The data are
entirely in Photon Counting (PC) mode. The enhanced XRT position for
this burst was given by Evans et al. (GCN Circ. 19717).
The light curve can be modelled with a power-law decay with a decay
index of alpha=0.87 (+0.15, -0.13).
A spectrum formed from the PC mode data can be fitted with an absorbed
power-law with a photon spectral index of 2.1 (+1.0, -0.8). The
best-fitting absorption column is 2.7 (+1.9, -1.4) x 10^22 cm^-2, in
excess of the Galactic value of 9.6 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 6.5 x 10^-11 (1.7 x 10^-10) erg
cm^-2 count^-1.
A summary of the PC-mode spectrum is thus:
Total column: 2.7 (+1.9, -1.4) x 10^22 cm^-2
Galactic foreground: 9.6 x 10^21 cm^-2
Excess significance: 2.1 sigma
Photon index: 2.1 (+1.0, -0.8)
If the light curve continues to decay with a power-law decay index of
0.87, the count rate at T+24 hours will be 7.3 x 10^-4 count s^-1,
corresponding to an observed (unabsorbed) 0.3-10 keV flux of 4.8 x
10^-14 (1.2 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/00704572.
This circular is an official product of the Swift-XRT team.
|
| GCN 19719 table |
|---|
| GRB_name |
GRB160716A |
| GCN_number |
19719 |
| Detection_method |
Swift-BAT Det |
| ra |
190.5020° |
| decl |
-61.3640° |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 19719
SUBJECT: GRB 160716A: Swift-BAT refined analysis
DATE: 16/07/16 14:36:32 GMT
FROM: Scott Barthelmy at NASA/GSFC
T. N. Ukwatta (LANL), S. D. Barthelmy (GSFC), J. R. Cummings (GSFC/UMBC),
N. Gehrels (GSFC), L. M. Z. Hagen (PSU), H. A. Krimm (GSFC/USRA),
A. Y. Lien (GSFC/UMBC), C. B. Markwardt (GSFC), D. M. Palmer (LANL),
T. Sakamoto (AGU), M. Stamatikos (OSU) (i.e. the Swift-BAT team):
Using the data set from T-240 to T+877 sec from the recent telemetry downlinks,
we report further analysis of BAT GRB 160716A (trigger #704572)
(Hagen, et al., GCN Circ. 19716). The BAT ground-calculated position is
RA, Dec = 190.502, -61.364 deg, which is
RA(J2000) = 12h 42m 00.6s
Dec(J2000) = -61d 21' 51.8"
with an uncertainty of 2.0 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 75%.
The mask-weighted light curve shows at least 2 overlapping peaks starting
at ~T-5sec, peaking at ~T+1 sec, and ending at ~T+20 sec.
T90 (15-350 keV) is 6.39 +- 0.57 sec (estimated error including systematics).
The time-averaged spectrum from T-0.43 to T+6.73 sec is best fit by a simple
power-law model. The power law index of the time-averaged spectrum is
2.29 +- 0.30. The fluence in the 15-150 keV band is 1.8 +- 0.3 x 10^-07 erg/cm2.
The 1-sec peak photon flux measured from T+0.95 sec in the 15-150 keV band
is 0.8 +- 0.2 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/704572/BA/
|
| GCN 19721 table |
|---|
| GRB_name |
GRB160716A |
| GCN_number |
19721 |
| Detection_method |
Swift-UVOT Det |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 19721
SUBJECT: GRB 160716A: Swift/UVOT Detection
DATE: 16/07/18 00:25:59 GMT
FROM: Lea Hagen at PSU
L. M. Z. Hagen (PSU) reports on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 160716A
88 s after the BAT trigger (Hagen et al., GCN Circ. 19716). A source
consistent with the XRT position (Evans et al., GCN Circ. 19717) is
detected in the initial UVOT exposures in the white filter. The source
has marginal evidence for fading but is not seen in the Digitized Sky
Survey (DSS), so it is unclear at this time whether it is the optical
afterglow. 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 88 773 183 19.93+-0.23
white 6218 6418 196 20.47+-0.35
white 24012 98905 490 20.62+-0.25
v 631 651 19 >17.58
b 556 750 38 >18.95
u 301 725 265 >19.63
uvw1 681 701 19 >17.48
uvm2 656 676 19 >17.10
uvw2 607 627 19 >17.52
The magnitudes in the table are not corrected for the Galactic extinction
due to the large, but uncertain, reddening of E(B-V) = 1.47 in the
direction of the burst (Schlegel et al. 1998).
|
| GCN 19742 table |
|---|
| GRB_name |
GRB160716A |
| GCN_number |
19742 |
| Detection_method |
Optical |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 19742
SUBJECT: GRB 160716A: TAROT La Silla observatory optical observations
DATE: 16/07/29 21:58:47 GMT
FROM: Alain Klotz at IRAP-CNRS-OMP
Klotz A., Turpin D., Atteia J.L. (CNRS-OMP-IRAP),
Boer, M., Laugier, R. (CNRS-ARTEMIS),
Gendre B. (UVI - Etelman Obs.) report:
We imaged the field of GRB 160716A detected by SWIFT
(trigger 704572) with the TAROT robotic telescope (D=25cm)
located at the European Southern Observatory,
La Silla observatory, Chile.
The observations started 43.6s after the GRB trigger
(15.6s after the notice). The elevation of the field decreased from
44 degrees above horizon and weather conditions
were good.
The first image is trailed with a duration of 60.0s
(see the description in Klotz et al., 2006, A&A 451, L39).
In the error box of XRT provided by Evans et al. (GCNC 19717)
we do not detect any OT with a limiting magnitude of:
t0+43.6s to t0+103.6s : Rlim = 16.7
The second image is 30.0s exposure in tracking mode:
t0+117.4s to t0+147.4s : Rlim = 17.5
We co-added a series of exposures:
t0+117.4s to t0+412.5s : Rlim = 18.2
Magnitudes were estimated with the nearby USNO-B1 stars
and are not corrected for galactic dust extinction.
N.B. Galactic coordinates are lon=301.8222 lat= +1.4859
and the galactic extinction in R band is about magnitudes.
|