| Summary table |
|---|
| Variable |
Value |
Source |
| T0 |
18:40:21 UTC |
GCN_circulars,Swift Det |
| ra |
67.4339° |
Swift |
| decl |
5.7354° |
Swift |
| pos_error |
1.81e-04° |
Swift |
| T90 |
7.2 s |
Swift |
| T90_start |
18:40:21 UTC |
Swift |
| fluence |
2.10e-06 erg/cm² |
Swift |
| T100 |
7.2 s |
|
| GBM_located |
False |
|
| mjd |
57276.778020833335 |
GCN_circulars,Swift Det |
| IPN table |
|---|
| GRB_name |
GRB150911A |
| ra |
67.4250° |
| decl |
5.7500° |
| pos_error |
5.00e-02° |
| Swift table |
|---|
| GRB_name |
GRB150911A |
| t_trigger |
18:40:21 UTC |
| ra |
67.4339° |
| decl |
5.7354° |
| pos_error |
1.81e-04° |
| T90 |
7.2 s |
| fluence |
2.10e-06 erg/cm² |
| GCN 18280 table |
|---|
| GRB_name |
GRB150911A |
| GCN_number |
18280 |
| Detection_method |
Swift Det |
| t_trigger |
18:40:21 UTC |
| ra |
67.4240° |
| decl |
5.7430° |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 18280
SUBJECT: GRB 150911A: Swift detection of a burst
DATE: 15/09/11 18:55:33 GMT
FROM: Scott Barthelmy at NASA/GSFC
R. L. C. Starling (U Leicester), S. D. Barthelmy (GSFC),
D. N. Burrows (PSU), V. D'Elia (ASDC), H. A. Krimm (CRESST/GSFC/USRA),
F. E. Marshall (NASA/GSFC), B. Sbarufatti (INAF-OAB/PSU) and
M. H. Siegel (PSU) report on behalf of the Swift Team:
At 18:40:21 UT, the Swift Burst Alert Telescope (BAT) triggered and
located GRB 150911A (trigger=655262). Swift slewed immediately to the burst.
The BAT on-board calculated location is
RA, Dec 67.424, +5.743, which is
RA(J2000) = 04h 29m 42s
Dec(J2000) = +05d 44' 34"
with an uncertainty of 3 arcmin (radius, 90% containment, including
systematic uncertainty). The BAT light curve shows a pair of overlapping peaks
with a total duration of about 12 sec. The peak count rate
was ~5000 counts/sec (15-350 keV), at ~4 sec after the trigger.
The XRT began observing the field at 18:41:41.3 UT, 79.9 seconds after
the BAT trigger. Using promptly downlinked data we find a fading,
uncatalogued X-ray source with an enhanced position: RA, Dec 67.4331,
5.7350 which is equivalent to:
RA(J2000) = 04h 29m 43.95s
Dec(J2000) = +05d 44' 05.9"
with an uncertainty of 2.3 arcseconds (radius, 90% containment). This
location is 43 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.
A power-law fit to a spectrum formed from promptly downlinked event
data gives a column density consistent with the Galactic value of 1.87
x 10^21 cm^-2 (Willingale et al. 2013).
UVOT took a finding chart exposure of 150 seconds with the White filter
starting 82 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
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
0.32.
Burst Advocate for this burst is R. L. C. Starling (rlcs1 AT star.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 18282 table |
|---|
| GRB_name |
GRB150911A |
| GCN_number |
18282 |
| Detection_method |
MITSuME |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 18282
SUBJECT: GRB150911A MITSuME Okayama Ks-band upper-limit
DATE: 15/09/11 20:40:22 GMT
FROM: Kenshi Yanagisawa at OAO/NAOJ
Kenshi Yanagisawa, Daisuke Kuroda, Yasuhiro Shimizu, Hideyuki Izumiura
(OAO/NAOJ), Michitoshi Yoshida (Hiroshima-U), Kouji Ohta(Kyoto-U)
and Nobuyuki Kawai(Tokyo Tech.) report on behalf of the MITSuME
collaboration:
We observed the field of GRB150911A (Starling et al, GCN18280)
in Ks-band with a wide-field near infrared imager at Okayama
Astrophysical Observatory (Japan). The imager has effective
aperture of 0.91 m.
Observations started from 18:56 UT on 11th September, just 16 min
after the BAT trigger, to 19:10 UT. The total exposure of 6 min
was successfully obtained.
In our co-add image, we did not find any new point source within
the enhanced XRT error circle (Starling et al, GCN18280) down
to limiting magnitude of Ks=14.3 (Vega, S/N=10) . The photometric
calibration was made against 2MASS field stars.
T0+[s] MID-UT T-EXP[sec] Ks
---------------------------------------------------
+1380 19:03 375 >14.3
---------------------------------------------------
T0+ : Elapsed time after the burt [sec]
T-EXP: Total Exposure time [sec]
|
| GCN 18283 table |
|---|
| GRB_name |
GRB150911A |
| GCN_number |
18283 |
| Detection_method |
Swift-XRT Det |
| ra |
67.4341° |
| decl |
5.7353° |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 18283
SUBJECT: GRB 150911A: Enhanced Swift-XRT position
DATE: 15/09/11 21:53:13 GMT
FROM: Phil Evans at U of Leicester
M.R. Goad, J.P. Osborne, A.P. Beardmore and P.A. Evans (U. Leicester)
report on behalf of the Swift-XRT team.
Using 1481 s of XRT Photon Counting mode data and 2 UVOT
images for GRB 150911A, 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 = 67.43406, +5.73533 which is equivalent
to:
RA (J2000): 04h 29m 44.17s
Dec (J2000): +05d 44' 07.2"
with an uncertainty of 1.7 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 18286 table |
|---|
| GRB_name |
GRB150911A |
| GCN_number |
18286 |
| Detection_method |
MITSuME |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 18286
SUBJECT: GRB 150911A: MITSuME Okayama upper limits
DATE: 15/09/12 00:15:46 GMT
FROM: Daisuke Kuroda at OAO/NAOJ
D. Kuroda, K. Yanagisawa, Y. Shimizu, H. Toda (OAO, NAOJ),
S. Nagayama (NAOJ), M. Yoshida (Hiroshima), K. Ohta (Kyoto)
and N. Kawai(Tokyo Tech)
report on behalf of MITSuME and OISTER collaboration:
We observed the field of GRB 150911A (Starling et al., GCNC 18280)
with the optical three color (g', Rc and Ic) CCD camera attached
to the MITSuME 50cm telescope of Okayama Astrophysical Observatory.
The observation started on 2015-09-11 18:41:02 UT (~41 sec after the burst).
We did not find any new point source within the enhanced XRT circle
(Goad et al., GCNC 18283) 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
-----------------------------------------------------
0.01168 18:57:10 1380.0 >20.2 >19.5 >19.1
-----------------------------------------------------
T0+ : Elapsed time after the burst [day]
T-EXP: Total Exposure time [sec]
|
| GCN 18290 table |
|---|
| GRB_name |
GRB150911A |
| GCN_number |
18290 |
| Detection_method |
Swift-XRT Other |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 18290
SUBJECT: GRB 150911A: Swift-XRT refined Analysis
DATE: 15/09/12 06:55:05 GMT
FROM: Phil Evans at U of Leicester
C. Pagani (U. Leicester), A.P. Beardmore (U. Leicester), P. D'Avanzo
(INAF-OAB), V. D'Elia (ASDC), A. D'ai (INAF-IASFPA), T.G.R. Roegiers
(PSU), L.M. McCauley (PSU), J.A. Kennea (PSU), P.A. Evans (U.
Leicester) and R.L.C. Starling report on behalf of the Swift-XRT team:
We have analysed 10 ks of XRT data for GRB 150911A (Starling et al. GCN
Circ. 18280), from 65 s to 23.7 ks after the BAT trigger. The data
comprise 114 s in Windowed Timing (WT) mode (the first 7 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 Goad et al.
(GCN Circ. 18283).
The late-time light curve (from T0+4.9 ks) can be modelled with a
power-law decay with a decay index of alpha=1.81 (+0.14, -0.13).
A spectrum formed from the WT mode data can be fitted with an absorbed
power-law with a photon spectral index of 1.58 (+0.11, -0.10). The
best-fitting absorption column is 2.7 (+0.6, -0.5) x 10^21 cm^-2, in
excess of the Galactic value of 1.9 x 10^21 cm^-2 (Willingale et al.
2013). The PC mode spectrum has a photon index of 1.96 (+0.14, -0.13)
and a best-fitting absorption column of 4.1 (+/-0.7) x 10^21 cm^-2. The
counts to observed (unabsorbed) 0.3-10 keV flux conversion factor
deduced from this spectrum is 4.0 x 10^-11 (6.1 x 10^-11) erg cm^-2
count^-1.
A summary of the PC-mode spectrum is thus:
Total column: 4.1 (+/-0.7) x 10^21 cm^-2
Galactic foreground: 1.9 x 10^21 cm^-2
Excess significance: 5.4 sigma
Photon index: 1.96 (+0.14, -0.13)
If the light curve continues to decay with a power-law decay index of
1.81, the count rate at T+24 hours will be 2.0 x 10^-3 count s^-1,
corresponding to an observed (unabsorbed) 0.3-10 keV flux of 8.2 x
10^-14 (1.3 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/00655262.
This circular is an official product of the Swift-XRT team.
|
| GCN 18292 table |
|---|
| GRB_name |
GRB150911A |
| GCN_number |
18292 |
| Detection_method |
Swift-BAT Det |
| ra |
67.4280° |
| decl |
5.7310° |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 18292
SUBJECT: GRB 150911A: Swift-BAT refined analysis
DATE: 15/09/12 14:47:18 GMT
FROM: Tilan Ukwatta at LANL
C. B. Markwardt (GSFC), S. D. Barthelmy (GSFC),
J. R. Cummings (GSFC/UMBC), N. Gehrels (GSFC),
H. A. Krimm (GSFC/USRA), A. Y. Lien (GSFC/UMBC),
D. M. Palmer (LANL), T. Sakamoto (AGU),
M. Stamatikos (OSU), R. L. C. Starling (U Leicester),
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 150911A (trigger #655262)
(Starling, et al., GCN Circ. 18280). The BAT ground-calculated position is
RA, Dec = 67.428, 5.731 deg which is
RA(J2000) = 04h 29m 42.6s
Dec(J2000) = +05d 43' 50.2"
with an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 67%.
The mask-weighted light curve shows a broad peak starting around
T-2 sec and ending around T+10 sec. T90 (15-350 keV) is
T90 (15-350 keV) is 7.2 +- 0.6 sec (estimated error including systematics).
The time-averaged spectrum from T-1.04 to T+9.61 sec is best fit by a power
law
with an exponential cutoff. This fit gives a photon index 1.02 +- 0.26,
and Epeak of 51.6 +- 3.8 keV (chi squared 52.34 for 56 d.o.f.). For this
model the total fluence in the 15-150 keV band is 2.1 +- 0.1 x 10^-06
erg/cm2
and the 1-sec peak flux measured from T+3.90 sec in the 15-150 keV band is
5.2 +- 0.3 ph/cm2/sec. A fit to a simple power law gives a photon index
of 1.93 +- 0.05 (chi squared 97.49 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/655262/BA/
|
| GCN 18293 table |
|---|
| GRB_name |
GRB150911A |
| GCN_number |
18293 |
| Detection_method |
Swift-UVOT Other |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 18293
SUBJECT: GRB 150911A: Swift/UVOT Upper Limits
DATE: 15/09/12 15:18:00 GMT
FROM: Frank Marshall at GSFC
GRB 150911A: Swift/UVOT Upper Limits
F. E. Marshall (NASA/GSFC) and R. L. C. Starling (U. Leicester)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 150911A
82 s after the BAT trigger (Starling et al., GCN Circ. 18280).
No optical afterglow consistent with the enhanced XRT position
(Goad et al. GCN Circ. 18283) 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 82 232 147 >20.6
u_FC 294 544 246 >20.2
white 82 1702 400 >21.2
v 623 1590 117 >18.9
b 549 1689 117 >19.4
u 294 1665 343 >20.4
w1 673 1640 117 >19.1
w2 772 1565 97 >19.5
The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.32 in the direction of the burst
(Schlegel et al. 1998).
|
| GCN 18294 table |
|---|
| GRB_name |
GRB150911A |
| GCN_number |
18294 |
| Detection_method |
Other |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 18294
SUBJECT: GRB150911A: P60 Observations
DATE: 15/09/12 15:24:56 GMT
FROM: S. Bradley Cenko at NASA/GSFC
S. B. Cenko (NASA/GSFC) and D. A. Perley (DARK) report on behalf of a larger collaboration:
We observed the location of GRB150911A (Starling et al., GCN 18280) with the robotic Palomar 60-inch telescope. Observations were obtained in the r', i', and z' filters beginning at 09:03 UT on 2015 Sep 12 (dt ~ 14.4 hours after the Swift trigger). In stacked images we do not detect any sources within the enhanced XRT error circle (Goad et al., GCN 18283) in any filter. Using comparison point sources from the USNO-B1 catalog for reference, we calculate a limiting magnitude of R > 22.5 in a stacked image at a median time of 09:46 UT on 2015 Sep 12.
|
| GCN 18303 table |
|---|
| GRB_name |
GRB150911A |
| GCN_number |
18303 |
| Detection_method |
Optical |
| ra |
67.4345° |
| decl |
5.7357° |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 18303
SUBJECT: GRB 150911A: WHT optical imaging
DATE: 15/09/13 20:49:33 GMT
FROM: Nial Tanvir at U.Leicester
N. R. Tanvir, K. Wiersema (U. Leicester), A. J. Levan (U. Warwick),
F. Riddick (ING), C. Bergfors (UCL) report on behalf of a larger collaboration:
We observed the position of GRB 150911A (Starling et al. GCN 18280), using the ACAM instrument on the 4.2m William Herschel Telescope (La Palma, Spain). We acquired imaging in Sloan r, i and z bands, with midpoint 03:46 UT on 12 September 2015 (i.e. 8.9 hours after burst). Data consist of 4x300 seconds exposure time in each filter. No sources are detected within the XRT enhanced position error circle (Goad et al. GCN 18283). Just outside the XRT error circle are two faint sources, detected in all filters:
Source 1 at RA, Dec = 04:29:44.279, +5:44:08.52
Source 2 at RA, Dec = 04:29:44.120, +5:44:04.34
We note that source 1 is slightly extended and provisional photometric calibration gives magnitude r=24.1. Source 2 appears point-like with magnitude r=25.2.
A second epoch observation would be required to ascertain which if any of these sources is associated with the GRB.
|
| GCN 18307 table |
|---|
| GRB_name |
GRB150911A |
| GCN_number |
18307 |
| Detection_method |
Other |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 18307
SUBJECT: GRB 150911A: Khureltogot upper limit
DATE: 15/09/14 07:20:31 GMT
FROM: Alexei Pozanenko at IKI
E. Mazaeva (IKI), S. Schmalz (AIP), N. Tungalag (Research Center of Astronomy and Geophysics MAS), A. Volnova (IKI), I.Molotov (KIAM), A. Pozanenko (IKI) report on behalf of larger GRB follow-up collaboration:
We observed the field of GRB 150911A (Starling et al., GCN 18280) with ORI-40 telescope of Khureltogot observatory starting on Sep., 11 (UT) 19:03:00, i.e. ~23 minutes after the burst trigger. We do not detect any object within enhanced XRT error circle (Goad et al., GCN 18283). Photometry of the field is following
Date UT start t-T0 Filter Exp. Upper_Limit (3sigma)
(mid, days) (s)
2015-09-11 19:03:00 0.0351 none 45*60 20.9
Photometry is base on nearby USNO-B.1 stars
USNO-B.1_id R2
0957-0043966 15.54
0957-0043954 16.24
0957-0043961 16.45
|
| GCN 18308 table |
|---|
| GRB_name |
GRB150911A |
| GCN_number |
18308 |
| Detection_method |
Other |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 18308
SUBJECT: GRB 150911A: Mt. Terskol observatory upper limit
DATE: 15/09/14 07:27:05 GMT
FROM: Alexei Pozanenko at IKI
M. Andreev (Terskol Branch of INASAN), E. Mazaeva (IKI), A. Sergeev (Terskol Branch of INASAN), A. Volnova (IKI), A. Pozanenko (IKI) report on behalf of larger GRB follow-up collaboration:
We observed the field of GRB 150911A (Starling et al., GCN 18280) with Zeiss-600 telescope of Mt. Terskol observatory in R-filter starting on Sep. 11 (UT) 23:26:40. We do not detect any object within enhanced XRT error circle (Goad et al., GCN 18283). Photometry of the field is following
Date UT start t-T0 Filter Exp. Upper_Limit (3sigma)
(mid, days) (s)
2015-09-11 23:26:40 0.2273 R 40*120 21.7
Photometry is based on nearby USNO-B.1 stars
USNO-B.1_id R2
0957-0043966 15.54
0957-0043954 16.24
0957-0043961 16.45
|
| GCN 18309 table |
|---|
| GRB_name |
GRB150911A |
| GCN_number |
18309 |
| Detection_method |
Other |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 18309
SUBJECT: GRB 150911A: Chuguev observatory upper limit
DATE: 15/09/14 08:47:21 GMT
FROM: Alexei Pozanenko at IKI
Yu. Krugly (IA KhNU), V. Shevchenko (IA KhNU), T. Gromakina (IA KhNU), I. Molotov (KIAM), E. Mazaeva (IKI), A. Pozanenko (IKI) report on behalf of larger GRB follow-up collaboration:
We observed the field of GRB 150911A (Starling et al., GCN 18280) with 0.7m telescope of Institute of Astronomy, Kharkiv National University starting on Sep. 12 (UT) 01:07:23. We do not detect any object within enhanced XRT error circle (Goad et al., GCN 18283). Photometry of the field is following
Date UT start t-T0 Filter Exp. Upper_Limit (3sigma)
(mid, days) (s)
2015-09-12 01:07:23 0.2804 R 11*180 20.8
Photometry is based on nearby USNO-B.1 stars
USNO-B.1_id R2
0957-0043966 15.54
0957-0043954 16.24
0957-0043961 16.45
|
| GCN 18313 table |
|---|
| GRB_name |
GRB150911A |
| GCN_number |
18313 |
| Detection_method |
GROND |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 18313
SUBJECT: GRB 150911A: GROND Upper Limits
DATE: 15/09/14 18:14:04 GMT
FROM: Sebastian Schmidl at TLS Tautenburg
S. Schmidl (TLS Tautenburg), F. Knust, and J. Greiner (both MPE Garching)
report on behalf of the GROND team:
We observed the field of GRB 150911A (Swift trigger 655262; Starling et
al, GCN 18280) 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 on September 12, 2015, at 05:59 UT, 11.3 hrs after
the GRB trigger. They were performed at an average seeing of 2.2" and at an
average airmass of 1.8.
We do not detect a source within the 1.7" Swift-XRT error circle
reported by Goad et al. (GCN 18283).
Based on total exposures of 33 minutes in g'r'i'z'and 43 minutes in
JHK, at a midtime of 12.1 hrs after the burst, we measure the following
preliminary upper limits (AB magnitude system):
g'> 24.1 mag,
r'> 23.8 mag,
i'> 23.2 mag,
z'> 22.8 mag,
J > 21.6 mag,
H > 21.0 mag, and
K > 19.9 mag.
Given upper limits 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) = 0.32 mag
in the direction of the burst (Schlegel et al. 1998).
|
| GCN 18326 table |
|---|
| GRB_name |
GRB150911A |
| GCN_number |
18326 |
| Detection_method |
Konus-Wind Det |
| Circular_text |
TITLE: GCN CIRCULAR
NUMBER: 18326
SUBJECT: Konus-Wind observation of GRB 150911A
DATE: 15/09/17 04:21:46 GMT
FROM: Anastasia Tsvetkova at Ioffe Institute
S. Golenetskii, R.Aptekar, D. Frederiks, V. Pal'shin, P. Oleynik,
M. Ulanov, D. Svinkin, A. Tsvetkova, A.Lysenko, A. Kozlova and T. Cline
on behalf of the Konus-Wind team, report:
The long-duration GRB 150911A (Swift-BAT trigger #655262:
Starling, et al., GCN Circ. 18280; Markwardt , et al., GCN Circ. 18292)
was detected by Konus-Wind in the waiting mode.
The burst light curve shows a single pulse with a total duration of ~9 s.
As observed by Konus-Wind, the burst had a fluence of
3.13(-0.20,+0.26)x10^-6 erg/cm2 and a 2.944-s peak flux,
measured from ~T0(BAT)+2.5 s, of 4.01(-0.32,+0.59)x10^-7 erg/cm2/s
(both in the 20 - 1000 keV energy range).
Fitting the K-W 3-channel time-integrated spectrum
(measured from ~T0(BAT)-0.5 s to ~T0(BAT)+8.5 s)
by a simple power-law model yields the photon index
-2.32(-0.09,+0.09), chi2=0.6/1 dof.
All the quoted errors are estimated at the 1 sigma confidence level.
All the presented results are preliminary.
The K-W light curve of this burst is available at
http://www.ioffe.rssi.ru/LEA/GRBs/GRB150911A/
[GCN OPS NOTE(16sep15): This circular was delayed ~12 hours
in distribution because of an operation mistake at GCN.]
|