| Summary table |
|---|
| Variable |
Value |
Source |
| T0 |
21:08:03 UTC |
GCN_circulars,Swift Det |
| ra |
251.8372° |
Swift |
| decl |
43.7407° |
Swift |
| pos_error |
1.81e-04° |
Swift |
| GBM_located |
False |
|
| mjd |
58788.880590277775 |
GCN_circulars,Swift Det |
| IPN table |
|---|
| GRB_name |
GRB191101A |
| ra |
251.8458° |
| decl |
43.7500° |
| pos_error |
5.00e-02° |
| Swift table |
|---|
| GRB_name |
GRB191101A |
| t_trigger |
21:08:03 UTC |
| ra |
251.8372° |
| decl |
43.7407° |
| pos_error |
1.81e-04° |
| GCN 26135 table |
|---|
| GRB_name |
GRB191101A |
| GCN_number |
26135 |
| Detection_method |
Swift Det |
| t_trigger |
21:08:03 UTC |
| ra |
251.8440° |
| decl |
43.7540° |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 26135
SUBJECT: GRB 191101A: Swift detection of a burst
DATE: 19/11/01 21:33:39 GMT
FROM: David Palmer at LANL
A. D'Ai (INAF-IASFPA), E. Ambrosi (INAF-IASFPA), V. D'Elia (SSDC),
J. A. Kennea (PSU), N. J. Klingler (PSU), N. P. M. Kuin (UCL-MSSL),
F. E. Marshall (NASA/GSFC), D. M. Palmer (LANL) and M. H. Siegel (PSU)
report on behalf of the Neil Gehrels Swift Observatory Team:
At 21:08:03 UT, the Swift Burst Alert Telescope (BAT) triggered and
located GRB 191101A (trigger=932742). Swift slewed immediately to the burst.
The BAT on-board calculated location is
RA, Dec 251.844, +43.754 which is
RA(J2000) = 16h 47m 23s
Dec(J2000) = +43d 45' 15"
with an uncertainty of 3 arcmin (radius, 90% containment, including
systematic uncertainty). The BAT light curve showed a complex structure
with a duration of about 20 sec. The peak count rate
was ~1200 counts/sec (15-350 keV), at ~0 sec after the trigger.
The XRT began observing the field at 21:09:42.4 UT, 99.0 seconds after
the BAT trigger. Using promptly downlinked data we find a bright,
uncatalogued X-ray source located at RA, Dec 251.83474, 43.74103 which
is equivalent to:
RA(J2000) = 16h 47m 20.34s
Dec(J2000) = +43d 44' 27.7"
with an uncertainty of 4.0 arcseconds (radius, 90% containment). This
location is 52 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. No
spectrum from the promptly downlinked event data is yet available to
determine the column density.
The initial flux in the 2.5 s image was 8.42e-09 erg cm^-2 s^-1 (0.2-10
keV).
UVOT took a finding chart exposure of 150 seconds with the White filter
starting 109 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 expected
extinction corresponding to E(B-V) of 0.01.
Burst Advocate for this burst is A. D'Ai (antonino.dai AT inaf.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/)
|
| GCN 26137 table |
|---|
| GRB_name |
GRB191101A |
| GCN_number |
26137 |
| Detection_method |
Swift-XRT Other |
| ra |
251.8374° |
| decl |
43.7406° |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 26137
SUBJECT: GRB 191101A: Prompt enhanced Swift-XRT position
DATE: 19/11/01 21:48:45 GMT
FROM: Phil Evans at U of Leicester
P.A. Evans (U. Leicester) reports on behalf of the Swift-XRT team:
Using promptly downlinked XRT event data for GRB 191101A, we find an
enhanced XRT position of the afterglow: RA, Dec: 251.8374, 43.7406
which is equivalent to:
RA (J2000) = 16 47 20.97
Dec (J2000) = +43 44 26.3
with an uncertainty of 2.1 arcseconds (radius, 90% confidence).
Analysis of the promptly available data is online at
http://www.swift.ac.uk/sper/932742.
Position enhancement is is described by Goad et al. (2007, A&A, 476,
1401) and Evans et al. (2009, MNRAS, 397, 1177).
This circular is an official product of the Swift-XRT team.
|
| GCN 26140 table |
|---|
| GRB_name |
GRB191101A |
| GCN_number |
26140 |
| Detection_method |
Swift-XRT Det |
| ra |
251.8372° |
| decl |
43.7410° |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 26140
SUBJECT: GRB 191101A: Enhanced Swift-XRT position
DATE: 19/11/01 23:49:51 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 1298 s of XRT Photon Counting mode data and 1 UVOT
images for GRB 191101A, 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 = 251.83723, +43.74096 which is equivalent
to:
RA (J2000): 16h 47m 20.94s
Dec (J2000): +43d 44' 27.5"
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 26142 table |
|---|
| GRB_name |
GRB191101A |
| GCN_number |
26142 |
| Detection_method |
Swift-XRT Other |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 26142
SUBJECT: GRB 191101A: VIRT Optical Upper Limits
DATE: 19/11/02 01:51:43 GMT
FROM: Priyadarshini Gokuldass at U. of the Virgin Islands
P. Gokuldass (UVI), D. Morris (UVI), N. Orange (OrangeWave Innovative
Science, LLC), A. Cucchiara (College of Marin), R. Strausbaugh (UVI) report:
We observed the field of GRB 191101A (A.P. Beardmore et al., GCN 26140;
P.A. Evans et al., GCN 26137, D'Ai et al., GCN 26135) with the 0.5m Virgin
Island Robotic Telescope (VIRT) on 11-01-2019 starting at 23:03:18 UT
(T+115m). We report on an initial series of exposures in Clear filter
totaling 110s with an observation midpoint of T+117m. The weather
conditions were very good during the hours of observation and the zenith
angle at the start of the observation was 63 degrees. We observed the Swift
XRT position with a 20'x20' field of view.
We find no new source at the Swift-XRT position and report a 3-sigma upper
limit of approximately V=17.0. The limit is estimated from comparison to
nearby USNO B1 stars and is not corrected for Galactic extinction. The VIRT
is still in the commissioning phase.
Observations and analysis are ongoing. This message can be cited.
|
| GCN 26144 table |
|---|
| GRB_name |
GRB191101A |
| GCN_number |
26144 |
| Detection_method |
Swift-XRT Other |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 26144
SUBJECT: GRB 191101A: Swift-XRT refined Analysis
DATE: 19/11/02 06:34:50 GMT
FROM: Phil Evans at U of Leicester
J. D. Gropp (PSU), J.P. Osborne (U. Leicester), K.L. Page (U.
Leicester), A.P. Beardmore (U. Leicester), M. Capalbi (INAF-IASFPA), M.
Perri (ASDC), V. D'Elia (ASDC), A. Tohuvavohu (U. Toronto), J.A. Kennea
(PSU) and A. D'Ai report on behalf of the Swift-XRT team:
We have analysed 7.9 ks of XRT data for GRB 191101A (D'Ai et al. GCN
Circ. 26135), from 92 s to 24.5 ks after the BAT trigger. The data
comprise 190 s in Windowed Timing (WT) mode (the first 5 s were taken
while Swift was slewing) with the remainder in Photon Counting (PC)
mode. The enhanced XRT position for this burst was given by Beardmore
et al. (GCN Circ. 26137). The late-time light curve (from T0+4.8 ks) is
consistent with a constant source of mean count rate 4.8e+00 ct/sec. A
power-law fit gives an index of 0.18 (+0.22, -0.21).
A spectrum formed from the WT mode data can be fitted with an absorbed
power-law with a photon spectral index of 2.28 (+/-0.05). The
best-fitting absorption column is 9.9 (+1.2, -1.1) x 10^20 cm^-2, in
excess of the Galactic value of 1.3 x 10^20 cm^-2 (Willingale et al.
2013). The PC mode spectrum has a photon index of 2.08 (+0.15, -0.14)
and a best-fitting absorption column of 6.2 (+3.2, -2.9) x 10^20 cm^-2.
The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor
deduced from this spectrum is 3.1 x 10^-11 (3.7 x 10^-11) erg cm^-2
count^-1.
A summary of the PC-mode spectrum is thus:
Total column: 6.2 (+3.2, -2.9) x 10^20 cm^-2
Galactic foreground: 1.3 x 10^20 cm^-2
Excess significance: 2.8 sigma
Photon index: 2.08 (+0.15, -0.14)
The results of the XRT-team automatic analysis are available at
http://www.swift.ac.uk/xrt_products/00932742.
This circular is an official product of the Swift-XRT team.
|
| GCN 26145 table |
|---|
| GRB_name |
GRB191101A |
| GCN_number |
26145 |
| Detection_method |
Optical |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 26145
SUBJECT: GRB 191101A: iTelescope optical limit
DATE: 19/11/02 10:01:01 GMT
FROM: Albert Kong at NTHU
A.K.H. Kong (NTHU, Taiwan) reports
We observed the field of GRB 191101A (D'Ai et al. GCN 26135) with the
T11 0.5m telescope of iTelescope.Net in New Mexico. The observation
was done with a luminance filter (400-700 nm) beginning at 2019-11-02
02:08:44 UT (5 hours after the trigger) for 300 sec. At the position
of the enhanced X-ray afterglow (Evans et al. GCN 26137), we do not
detect any optical emission with a detection limit of about 19.5 mag
by comparing with the Gaia DR2 catalogue.
|
| GCN 26164 table |
|---|
| GRB_name |
GRB191101A |
| GCN_number |
26164 |
| Detection_method |
Swift-UVOT Other |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 26164
SUBJECT: GRB 191101A: Swift/UVOT Upper Limits
DATE: 19/11/04 19:01:00 GMT
FROM: Sam LaPorte at PSU
GRB 191101A: Swift/UVOT Upper Limits
S. J. LaPorte (PSU) and A. D'Ai (INAF-IASFPA)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 191101A
110 s after the BAT trigger (D'Ai et al., GCN Circ. 26135).
No optical afterglow consistent with the XRT position
(Beardmore et al. GCN Circ. 26140)
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 110 259 147 >21.1
u_FC 268 517 246 >20.3
white 110 5863 589 >21.6
v 597 1588 110 >19.6
b 523 5658 294 >21.2
u 268 5453 540 >20.9
w1 646 5248 294 >19.3
m2 622 5043 300 >19.8
w2 573 1564 117 >19.3
The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.01 in the direction of the burst
(Schlegel et al. 1998).
|
| GCN 26167 table |
|---|
| GRB_name |
GRB191101A |
| GCN_number |
26167 |
| Detection_method |
Swift-BAT Det |
| ra |
251.8450° |
| decl |
43.7400° |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 26167
SUBJECT: GRB 191101A: Swift-BAT refined analysis
DATE: 19/11/04 21:44:54 GMT
FROM: Hans Krimm at NSF/NASA-GSFC
M. Stamatikos (OSU), S. D. Barthelmy (GSFC), A. D'Ai (INAF-IASFPA),
H. A. Krimm (NSF), S. Laha (GSFC/UMBC), 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 191101A (trigger #932742)
(D'Ai, et al., GCN Circ. 26135). The BAT ground-calculated position is
RA, Dec = 251.845, 43.740 deg which is
RA(J2000) = 16h 47m 22.8s
Dec(J2000) = +43d 44' 24.5"
with an uncertainty of 1.7 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 47%.
The mask-weighted light curve shows a single, rather weak pulse, extending from
~T-20 sec, peaking at T+0 sec, dropping sharply at T+25 sec, followed by low-level
extended emission out to ~T+140 sec. T90 (15-350 keV) is 137.95 +- 22.83 sec
(estimated error including systematics).
The time-averaged spectrum from T-20.97 to T+143.53 sec is best fit by a simple
power-law model. The power law index of the time-averaged spectrum is
1.78 +- 0.18. The fluence in the 15-150 keV band is 1.9 +- 0.2 x 10^-6 erg/cm2.
The 1-sec peak photon flux measured from T-1.00 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 results of the batgrbproduct analysis are available at
http://gcn.gsfc.nasa.gov/notices_s/932742/BA/
|