GRB 150413A
GCN Circular 17688
Subject
GRB 150413A: Swift detection of a burst
Date
2015-04-13T14:06:39Z (10 years ago)
From
David Palmer at LANL <palmer@lanl.gov>
C. B. Markwardt (NASA/GSFC), M. M. Chester (PSU), J. A. Kennea (PSU),
H. A. Krimm (CRESST/GSFC/USRA), C. Pagani (U Leicester),
K. L. Page (U Leicester), D. M. Palmer (LANL) and T. N. Ukwatta (LANL)
report on behalf of the Swift Team:
At 13:54:58 UT, the Swift Burst Alert Telescope (BAT) triggered and
located GRB 150413A (trigger=637899). Swift did not slew immediately
to the burst due to an observing constraint.
The BAT on-board calculated location is
RA, Dec 190.385, +71.824 which is
RA(J2000) = 12h 41m 32s
Dec(J2000) = +71d 49' 26"
with an uncertainty of 3 arcmin (radius, 90% containment, including
systematic uncertainty). The BAT light curve showed a multi-peaked
structure with a duration of about 120 sec. The peak count rate
was ~1100 counts/sec (15-350 keV), at ~2 sec after the trigger.
Due to an observing constraint, Swift cannot observe until
T0+4 days. There will be no XRT or UVOT data until this time.
Burst Advocate for this burst is C. B. Markwardt (Craig.Markwardt AT nasa.gov).
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 17689
Subject
GRB 150413A: MASTER bright OT detection
Date
2015-04-13T14:21:11Z (10 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, N.Tyurina, V.Kornilov, P.Balanutsa, A.Kuznetsov,
D.Kuvshinov,
Lomonosov Moscow State University, Sternberg Astronomical Institute
D.Buckley, S. Potter, A.Kniazev, M.Kotze
South African Astronomical Observatory
A. Tlatov, A.V. Parhomenko, D. Dormidontov, V.Sennik
Kislovodsk Solar Station of the Pulkovo Observatory
V.Yurkov, Yu.Sergienko, D.Varda, E.Sinyakov
Blagoveschensk Educational State University, Blagoveschensk
V.Krushinski, I.Zalozhnih, A. Popov
Ural Federal University, 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 GRB150413A (Markwardt et al. GCN 17688)
132 sec after trigger time at 2015-04-13 13:57:10 UT in two
polarizations.
We see bright OT at:
RA, Dec = 12 41 41.98 +71 50 28.0
Mag = 16.1 (unfiltered 0.2B +0.8R UsnoB1)
The discovery image is available at
https://master.sai.msu.ru/static/OT/grb150413A.jpg
The message may be cited.
GCN Circular 17690
Subject
GRB 150413A: MASTER very bright unusual OT observations
Date
2015-04-13T14:46:33Z (10 years ago)
From
Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>
N.Tyurina, E. Gorbovskoy, N.Tyurina, V.Kornilov, P.Balanutsa,
A.Kuznetsov, D.Kuvshinov,
Lomonosov Moscow State University, Sternberg Astronomical Institute
K.Ivanov, S.Yazev, N.M.Budnev, O.Gres, O.Chuvalaev, V.A.Poleshchuk
Irkutsk State University
D.Buckley, S. Potter, A.Kniazev, M.Kotze
South African Astronomical Observatory
A. Tlatov, A.V. Parhomenko, D. Dormidontov, V.Sennik
Kislovodsk Solar Station of the Pulkovo Observatory
V.Yurkov, Yu.Sergienko, D.Varda, E.Sinyakov
Blagoveschensk Educational State University, Blagoveschensk
V.Krushinski, I.Zalozhnih, A. Popov
Ural Federal University, 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 GRB150413A (Markwardt et al. GCN 17688) 132 s.
After MASTER OT J124141.98+715028.0 detection (Ivanov et all, GCN 17689)
we see obvious brightening on next 4 expozition sets in two polarizations.
After 18 min MASTER OT J124141.98+715028.0 is about 14.7 !
The message may be cited.
GCN Circular 17691
Subject
GRB 150413A: MAXI/GSC detection
Date
2015-04-13T15:09:31Z (10 years ago)
From
Motoko Suzuki at RIKEN <motoko@crab.riken.jp>
M. Serino (RIKEN), H. Negoro (Nihon U.), S. Nakahira (JAXA),
S. Ueno, H. Tomida, M. Kimura, M. Ishikawa, Y. E. Nakagawa (JAXA),
T. Mihara, M. Sugizaki, M. Shidatsu, J. Sugimoto, T. Takagi, M. Matsuoka (RIKEN),
N. Kawai, T. Yoshii, Y. Tachibana (Tokyo Tech),
A. Yoshida, T. Sakamoto, Y. Kawakubo, H. Ohtsuki (AGU),
H. Tsunemi, R. Imatani (Osaka U.),
M. Nakajima, T. Namba, M. Fujita, F. Honda, K. Tanaka, T. Masumitsu (Nihon U.),
Y. Ueda, T. Kawamuro, T. Hori (Kyoto U.),
Y. Tsuboi, S. Kanetou (Chuo U.),
M. Yamauchi, D. Itoh (Miyazaki U.),
K. Yamaoka (Nagoya U.),
M. Morii (ISM)
report on behalf of the MAXI team:
At 13:56:30 UT, the MAXI/GSC nova alert system triggered a bright uncatalogued X-ray
transient source at the position
(R.A., Dec) = (190.278 deg, 71.742 deg) = (12 41 07, +71 44 31) (J2000).
The position is consistent with that reported by Markwardt et al. (GCN 17688).
The X-ray flux averaged over the scan was 440 +- 40 mCrab
(4-10keV, 1 sigma error).
There was no significant excess flux in the previous transit at UT 12:24
with an upper limit of 20 mCrab.
GCN Circular 17692
Subject
GRB 150413A: Khureltogot optical observations
Date
2015-04-13T15:55:04Z (10 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
S. Schmalz (AIP), A. Pozanenko (IKI), N. Tungalag (Research Center of
Astronomy and Geophysics MAS), E. Mazaeva (IKI), A. Volnova (IKI),
I.Molotov (KIAM), A. Pozanenko (IKI) report on behalf of larger GRB
follow-up collaboration:
We observed the field of the GRB 150413A (Markwardt et al., GCN 17688;
Serino et al., GCN 17691) with ORI-40 telescope of Khureltogot
observatory starting on Apr., 13 (UT) 14:08:52, i.e. ~10 minutes after
burst trigger. Within BAT/Swift error circle we clearly detect
fading optical source (Ivanov et al. GCN 17689, Tyurina et al. GCN
17690). Preliminary photometry of the source in single images is following
Date UT start t-T0 Filter Exp. OT OT_err
(mid, days) (s)
2015-04-13 14:08:52 0.0069 none 60 14.7 0.1
2015-04-13 14:39:52 0.0318 none 60 15.6 0.1
2015-04-13 15:11:54 0.0541 none 60 16.3 0.1
Photometry is based on nearby USNO-B1.0 stars, R2 mags.
Observation is continuing.
GCN Circular 17693
Subject
GRB 150413A: Nanshan optical and radio follow-ups
Date
2015-04-13T16:14:57Z (10 years ago)
From
Dong Xu at NAOC/CAS <dong.dark@gmail.com>
D. Xu (NAOC), X. Zhang, C.-H. Bai, G.-J. Feng, A. Esamdin, L. Ma,
J.-Z. Liu (XAO), Y. Qin (Geneva Observatory), J.-P. Yuan, Z.-G. Wen
(XAO) report:
We observed the field of GRB 150413A (Markwardt et al., GCN 17688;
Serino et al., GCN 17691) using the 1m telescope located at Nanshan,
Xinjiang, China. Observations started at 15:00:38 UT on 2015-04-13,
i.e., 1.09 hr after the burst and a series of 150s R-band images were
obtained and observations are ongoing.
The OT reported by MASTER (Ivanov et al., GCN 17689; Tyurina et al.,
GCN 17690) is within the BAT error circle, and it is clearly detected
in each of our images. Preliminary reduction shows that the OT has
been decaying very slowly since our observations. It has m(R) ~ 15.4
at 1.115 hr post-burst and has m(R) ~ 15.8 at 1.724 hr post-burst,
calibrated with the same USNO B1 star (#1618-0098185, R=15.59, close
to R1=16.02). The OT's lightcurve behavior is unusual compared to
normal GRB optical afterglows, although it indeed could be the
afterglow of the GRB.
We note that there is a bright and much extended galaxy within the BAT
error circle. However, we didn't find any apparent new point source
within the galaxy, compared to DSS.
In addition, we observed the field using the Nanshan 25m radio dish in
the pulsar searching mode, to check if there is any radio pulse mimicking a fast
radio burst and following the BAT trigger.
[GCN OPS NOTE(21apr15): Per author's request, the mode in the last sentence
was changed from "timing mode" to "pulsar searching mode".]
GCN Circular 17694
Subject
GRB 150413A: Tautenburg observations
Date
2015-04-13T19:50:02Z (10 years ago)
From
Sylvio Klose at TLS Tautenburg <klose@tls-tautenburg.de>
S. Klose, S. Schmidl, B. Stecklum, A. Nicuesa Guelbenzu, D. A. Kann, and
F. Ludwig (TLS Tautenburg) report:
Tautenburg observed the afterglow of GRB 150413A (Markwardt et al., GCN
17688; Ivanov et al., GCN 17689; Tyurina et al., GCN 17690; Serino et al.,
GCN 17691; Schmalz et al., GCN 17692; Xu et al., GCN 17693) with the 1.34m
Schmidt telescope under good weather conditions.
At a mean time of 19:23 UT we measure a preliminary magnitude of R = 17.2
+/- 0.1, calibrated against the USNO B1 star #1618-0098185 (Xu et al.).
Observations are continuing.
GCN Circular 17695
Subject
GRB 150413A: Khureltogot optical observations
Date
2015-04-14T02:02:12Z (10 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
S. Schmalz (AIP), N. Tungalag (Research Center of Astronomy and Geophysics
MAS), A. Pozanenko (IKI), E. Mazaeva (IKI), A. Volnova (IKI), I. Molotov
(KIAM), report on behalf of larger GRB follow-up collaboration:
We observed the field of the GRB 150413A (Markwardt et al., GCN 17688;
Serino et al., GCN 17691) with ORI-40 telescope of Khureltogot observatory
starting on Apr., 13 (UT) 14:08:52 and finishing on Apr. 13 (UT) 20:08:39.
The afterglow (Ivanov et al., GCN 17689, Tyurina et al., GCN 17690,
Schmalz et al., GCN 17692, Xu et al., GCN 17693, Klose et al., GCN 17694)
is detected up to the end of our observations. Preliminary light curve
obtained for single unfiltered images and calibrated against nearby
USNO-B1.0 stars (R2 mags) can be found in
http://grb.rssi.ru/GRB150413A/GRB150413A_ORI40_lc.jpg
In particular, our photometry on Apr., 13 (UT) 19:21:35 R=17.2+/-0.1 is
compatible with photometry at (UT) 19:23 reported by Klose et al. (GCN
17694).
GCN Circular 17696
Subject
GRB 150413A: P60 photometry
Date
2015-04-14T04:41:01Z (10 years ago)
From
Daniel Perley at Caltech <dperley@astro.caltech.edu>
D. A. Perley (Caltech) and S. B. Cenko (GSFC) report:
The Palomar 60-inch telescope observed the location of the optical
counterpart of GRB 150413A (Markwardt et al., GCN 17688; Ivanov et al.,
GCN 17689) starting at 03:15:21 UT on 2015-04-14. We acquired 3x180s
images in griz filters under good conditions.
The optical transient is well-detected in all four filters. Calibrating
relative to USNO stars in the field, we measure a magnitude of R = 19.1
(+/- 0.1) mag at this time (t = 0.560 days after the BAT trigger),
indicating significant fading since the early observations.
Further follow-up is planned.
GCN Circular 17697
Subject
GRB 150413A: redshift determination with the 2.2m CAHA
Date
2015-04-14T10:34:25Z (10 years ago)
From
Alberto Castro-Tirado at Inst.de Astro. de Andalucia <ajct@iaa.es>
R. Sanchez-Ramirez (UPV/EHU, IAA-CSIC), A. J. Castro-Tirado (IAA-CSIC,
ISA-UMA), F. Hoyos and J. Aceituno (CAHA), on behalf of a larger
collaboration, report:
Following the detection of GRB 150413A by Swift (Markwardt et al. GCNC
17688) we have obtained a 1200s+1800s spectrum at the position of the
optical afterglow (Ivanov et al. GCNC 17689, Serino et al. GCNC 17691,
Schmalz et al. GCNC 17692, Xu et al. GCNC 17693, Klose et al. GCNC 17694).
Observations were carried out with the 2.2m CAHA telescope (+ CAFOS) at
the German-Spanish Calar Alto Observatory, starting at 20:25 UT. (i.e. 6.5
hr post-burst) under poor weather and seeing conditions. After a
preliminary reduction, we have detected a broad absorption line which we
identify as Lyman-alpha at a reshift of z = 3.2. Due the low SNR of the
combined spectrum, we only detect several lines at low significance (Ni
II, Si IV, C IV, Fe II,�) consistent with this redshift, which we propose
to be the redshift of GRB 150413A.
We acknowledge excellent support of the CAHA staff.
GCN Circular 17698
Subject
GRB 150413A: optical observations
Date
2015-04-14T12:12:40Z (10 years ago)
From
Klaas Wiersema at U Leicester <kw113@leicester.ac.uk>
I. van de Stadt (AWSV Metius, Alkmaar, The Netherlands) and
K. Wiersema (U. of Leicester) report:
We observed the field of GRB 150413A (Markwardt et al. GCN 17688;
Ivanov et al., GCN 17689) using the ABT, a 10-inch remote controlled
observatory in Alkmaar, The Netherlands. In a series of I band exposures,
with midpoint 0.55 days after burst, the afterglow is not detected, with
a 5-sigma upper limit of 18.7 mag (calibrated using APASS field stars and
the Jordi et al. (2005) conversions). This limit is in agreement with the
light curve break seen by Schmalz et al. (GCN 17695).
GCN Circular 17700
Subject
GRB150413A, optical observations
Date
2015-04-14T13:57:16Z (10 years ago)
From
Kosmas Gazeas at U of Athens <kgaze@phys.uoa.gr>
Kosmas Gazeas and Konstantinos Sapountzis (National Univ. of Athens) report:
On 13 April 2015, we observed the GRB candidate optical counterpart
GRB150413A, as reported by Markwardt et al., GCN 17688 and Serino et al., GCN
17691. The observations have been obtained with the 0.40 m f/8 robotic
telescope at the University of Athens in R-band (Bessell specifications). Data
collection has started on Apr., 13 (UT) 17:38:58 and finishing on Apr. 13 (UT)
18:08:08 (mid-exposure time). A sum of 15 exposures of 120 sec each was
collected and all data were combined into a single image, although the optical
afterglow was barley seen in each individual exposure. Photometry with a 3
pixel (approximately 4 arcsec) radius aperture yields an R magnitude
estimation of R = 17.9 +- 0.3 mag for GRB150413A, as compared with respect to
the nearby USNO-B1.0 stars, which lie within a radius of 3-4 arcminutes around
the source. No absolute photometric calibration has been applied on these data.
This message is quotable in publications.
GCN Circular 17701
Subject
GRB 150413A: Swift-BAT refined analysis
Date
2015-04-14T14:03:03Z (10 years ago)
From
Amy Lien at GSFC <amy.y.lien@nasa.gov>
M. Stamatikos (OSU), 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),
T. N. Ukwatta (LANL) (i.e. the Swift-BAT team):
Using the data set from T-239 to T+963 sec from the recent telemetry downlink,
we report further analysis of BAT GRB 150413A (trigger #637899)
(Markwardt, et al., GCN Circ. 17688). The BAT ground-calculated position is
RA, Dec = 190.396, 71.839 deg which is
RA(J2000) = 12h 41m 35.1s
Dec(J2000) = +71d 50' 21.9"
with an uncertainty of 1.9 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 35%.
The mask-weighted light curve shows a multi-peaked structure that starts at
~ T-100 s and ends at ~ T+200 s. The most prominent pulse starts at ~ T+90 s,
peaks at ~ T+110 s, and ends at ~ T+120 s. T90 (15-350 keV) is 263.6 +- 36.7 sec
(estimated error including systematics).
The time-averaged spectrum from T-93.0 to T+209.8 sec is best fit by a simple
power-law model. The power law index of the time-averaged spectrum is
1.75 +- 0.14. The fluence in the 15-150 keV band is 4.3 +- 0.4 x 10^-6 erg/cm2.
The 1-sec peak photon flux measured from T+110.78 sec in the 15-150 keV band
is 1.6 +- 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/637899/BA/
GCN Circular 17702
Subject
GRB 150413A: T7 and T18 optical observations
Date
2015-04-14T14:37:36Z (10 years ago)
From
Veli-Pekka Hentunen at Taurus Hill Obs,A95 <veli-pekka.hentunen@kassiopeia.net>
Veli-Pekka Hentunen, Markku Nissinen and Tuomo Salmi (Taurus Hill
Observatory, Varkaus, Finland) report:
We have detected GRB 150413A optical afterglow at iTelescope
observatory T7 and T18 (AstroCamp Observatory, Nerpio, Spain)
using T7 0.43-m/6.8 and T18 0.32-m/8.0 astrographs. The observations
were started at 2015-04-13 20:29:13 (UT) and stopped at 23:54:26
(UT). Fifteen unfiltered images and four photometric R filter images with
120 sec exposure time were made.
The afterglow was detected at the following position RA 21:41:41.88
and DEC +71:50:27.9.
The following magnitude were obtained from the observations using
USNO-B1.0 1618-0098208 (R1=14.38) as a comparison star:
Telescope Tmid(h)+T0 Filter Exp. time Mag
T7 6.611 unfiltered 2x120s 17.2CR
T7 6.728 unfiltered 3x120s 17.4CR
T7 6.976 R 2x120s 17.7R
T7 7.184 R 2x120s 17.9R
T18 9.508 unfiltered 4x120s 18.0CR
T18 9.685 unfiltered 4x120s 18.0CR
T18 9.904 unfiltered 2x120s 18.0CR
---
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GCN Circular 17704
Subject
GRB 150413A: Bassano Bresciano Observatory optical observations
Date
2015-04-14T15:49:55Z (10 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 150413A detected by SWIFT(trigger 637899)
with the robotic telescope of (IAU station 565) Bassano Bresciano
Observatory, Italy (member of ISSP:Italian Supernovae Search Project)
The observations started 5.44 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 co-added 13 series of 10 exposures of 120 sec each.
Start T0+ End T0+ Vlim
---------------------------------
5.44 hour 10.26 hour 19.5
We clearly detect the optical counterpart
at the following coordinates:
12h 41m 41.78s +71d 50m 27s +-2 arcsc.
Magnitudes were estimated with the UCAC4 cat.
and are not corrected for galactic dust extinction:
----------------------
JD CV mag
----------------------
2457126.30650 17.92
2457126.32100 17.94
2457126.33532 18.10
2457126.34963 17.83
2457126.36395 17.99
2457126.37827 18.02
2457126.39258 18.21
2457126.40691 18.10
2457126.42122 18.21
2457126.43482 18.28
2457126.47849 18.54
2457126.49282 18.78
2457126.50714 19.20
The image, and magnitude plot are available at:
http://www.osservatoriobassano.org/GRB.asp
The message may be cited.
GCN Circular 17705
Subject
GRB 150413A
Date
2015-04-15T02:02:25Z (10 years ago)
From
Matteo M. M. Santangelo at OAC <oac@irf.lu.it>
M.M.M. Santangelo and S. Gambogi report:
We performed R and I bands CCD imagery of the field of GRB 150413A
with the 0.60-meter f/9.83 Cassegrain reflector of Capannori Astronomical Observatory, Italy.
Weather conditions were good, the seeing was fairly good, and the night-sky brightness
at zenith was 20.15 mag/arcsec2 in V band.
We clearly detected the optical counterpart of GRB 150413A.
Magnitudes in Johnson/Cousins R and I bands derived by means of Mira professional 7 UE software are as follows:
Date UT Exposure Band mag �� sigma
2015-04-13 20:56:22 300 s I 17.2 �� 0.2
2015-04-13 21:04:43 180 s R 17.6 �� 0.1
2015-04-13 21:11:02 360 s I 17.29 �� 0.04
Photometry is based on the nearby GSC 4397:1311 star, with magnitudes of comparison star from PPMXL.
This message may be cited.
GCN Circular 17706
Subject
GRB 150413A : Virtual Telescope optical observations
Date
2015-04-15T10:22:35Z (10 years ago)
From
Gianluca Masi at Bellatrix Astronomical Obs <gianluca@bellatrixobservatory.org>
G. Masi and P. L. Catalano, the Virtual Telescope Project - Italy, report:
We started time-series observations of GRB 150413A (C. B. Markwardt et al., GCN
17688) with the 17" robotic unit part of the Virtual Telescope (Ceccano, Italy)
at 21:25:00 UT, that is 7.5 hours after the burst.
An optical source is visible where described by K.Ivanov et al. (GCN 117689) on
60s and 120s exposures, unfiltered. The position of the source is RA: 12 41
41.97 Decl.: +71 50 27.7 (J2000.0, mean residuals of 0.2") and the magnitude was
estimated to be 18.0, assuming R mags for the reference stars from UCAC-4.
We covered the source for about one hour, detecting a fadind of about 0.4 mags
from the start to the end of the series.
Details are available on the page:
http://goo.gl/8jCkhs
This message can be cited.
GCN Circular 17707
Subject
GRB 150413A: additional P60 observations
Date
2015-04-15T11:29:50Z (10 years ago)
From
Daniel Perley at Caltech <dperley@astro.caltech.edu>
D. A. Perley (Caltech) and S. B. Cenko (GSFC) report:
We have continued to follow the optical counterpart of GRB 150413A
(Markwardt et al., GCN 17688; Ivanov et al., GCN 17689) with the
Palomar 60-inch robotic telescope. A second griz epoch was acquired
between 10:08:52 and 10:49:31 UT on the night of 2015-04-14, followed by
two deeper epochs (one gri, one r only) on the night of UT 2015-04-15.
Calibrating our r-band observations to a common set of USNO R-band
reference stars, we derive the following photometry (statistical
uncertainties only):
dt_mid = 0.5602 day : R = 19.13 +/- 0.03
dt_mid = 0.8464 day : R = 20.23 +/- 0.06
dt_mid = 1.6034 day : R = 21.52 +/- 0.16
dt_mid = 1.8652 day : R = 21.74 +/- 0.18
This suggests steep decay over this period (decay index ~ 2.2).
GCN Circular 17708
Subject
GRB 150413A: AMI 15 GHz detection of possible radio counterpart
Date
2015-04-15T17:47:38Z (10 years ago)
From
Alexander van der Horst at George Washington U <ajvanderhorst@gwu.edu>
G.E. Anderson, R.P. Fender, T.D. Staley, K. Mooley (University of Oxford),
A.J. van der Horst (George Washington University), A. Rowlinson (CASS)
We observed the position of GRB 150413A (Markwardt et al., GCN 17688)
at 15 GHz with the Arcminute Microkelvin Imager (AMI-LA) starting on
2015 April 14.745 to 14.973 UT, corresponding to 1.2 days post-burst.
On this date we possibly detected a radio source coincident with the
MASTER�s optical position (Ivanov et al., GCN 17689) with a preliminary
flux of 0.19 +/- 0.04 mJy. There are no catalogued radio sources at this
position.
An earlier observation was conducted on 2015 April 13.747 to 13.914 UT,
corresponding to 0.2 days post-burst, yielding a 3 sigma flux upper limit
of 0.15 mJy.
Further AMI monitoring is planned. We thank the AMI staff for scheduling
these observations.
GCN Circular 17709
Subject
GRB 150413A: GMG observation
Date
2015-04-16T04:29:34Z (10 years ago)
From
Jirong Mao at Yunnan Obs <jirongmao_obs@ynao.ac.cn>
J. Mao, C. Wang and J.-M. Bai report:
We observed the field of GRB 150413A (Markwardt et al., GCN 17688) with the 2.4-meter optical telescope at Gao-Mei-Gu (GMG)
station of Yunnan Observatory. Observations began from 13:35:29 UT, April 14, 2015, about 23.7 hours after the trigger. We
marginally detected the optical counterpart and estimated the magnitude as I~20.3.
GCN Circular 17710
Subject
GRB 150413A: Refined redshift
Date
2015-04-16T20:59:00Z (10 years ago)
From
Antonio de Ugarte Postigo at IAA-CSIC <deugarte@iaa.es>
A. de Ugarte Postigo (IAA-CSIC, DARK/NBI) and L. Tomasella (INAF-OAPd)
report:
We have reanalysed the spectra of the afterglow of GRB 150413A (Markwardt
et al. GCN 17688, Ivanov et al. GCN 17689) obtained by the Asiago Transient
Classification Program (Tomasella et al. 2014, AN, 335, 841) with the Asiago
1.82 m Copernico Telescope +AFOSC (Tomasella et al. ATel 7391). In addition
to the Ly-alpha feature already reported, we identify absorption features of SiII,
SiII*, CII, SiIV, CIV, FeII and AlII at a common redshift of 3.139+/-0.003, slightly
lower than previously reported by Sanchez-Ram�rez (GCN 17697) and by
Tomasella et al. (ATel 7391). In addition we report a tentative detection of a MgII
intervening absorber at z=0.950+/-0.003.
GCN Circular 17713
Subject
LOAO B, R Observations of GRB150413A
Date
2015-04-17T06:54:10Z (10 years ago)
From
Changsu Choi at Seoul Nat U <changsu@astro.snu.ac.kr>
Changsu Choi, Myungshin Im (CEOU/SNU), Hyun-Il Sung (KASI), and Yuji Urata
(NCU), on behalf of EAFON
We observed the field of GRB 150413A, Swift GRB 150413A (Markwardt et al.,
GCN
17688) in B,R-band using the 1-m telescope at Mt. Lemmon Optical Observatory
(LOAO) in Arizona, US
We obtained B, R-band images on Apr. 14.
We identified the optical afterglow in both band.
The photometric calibraton is based on APASS catalog(AAVSO) in the observed
field.
Details of Photometry are below:
UT Filter Mag Hour
after detetion trigger(2015/04/13T 13:54:58)
2015/04/14T 04:54:07 B 20.95 +-0.25 15.13583
2015/04/14T 05:08:05 R 19.82 +-0.14 15.36861
GCN Circular 17714
Subject
GRB 150413A: SAO RAS observations
Date
2015-04-17T11:23:58Z (10 years ago)
From
Moskvitin Alexander at SAO RAS <mosk@sao.ru>
A. S. Moskvitin (SAO RAS) report on behalf of larger GRB follow-up
collaboration:
The field of GRB 150413A (Markwardt et al., GCNC 17688) was observed
with the Zeiss-1000, 1-m telescope of SAO RAS. The observations were
carried out on the April, 16, 20:00:28--21:31:31 UT (T-T0 = 3.285 days).
16 x 300 sec. frames in Rc filter were obtained. The OT (Ivanov et al.,GCNC
17689)
is absent in the stacked image, therefore R > 23.0. The limiting value is
based on
the R2 magnitudes of nearby USNO-B1 stars.
We acknowledge A. S. Pozanenko, O. I. Spiridovova and V. S. Bychkova
for the help in observations.
GCN Circular 17715
Subject
GRB 150413A: MITSuME Akeno Optical observation
Date
2015-04-17T13:17:03Z (10 years ago)
From
Taketoshi Yoshii at Tokyo Tech <yoshii.t.ac@m.titech.ac.jp>
T.Fujiwara, Y. Saito, T. Yoshii, Y. Tachibana, H. Ohuchi,
Y. Yano, S.Kurita, Y. Ono, Y. Yatsu, and N. Kawai (Tokyo Tech)
report on behalf of the MITSuME collaboration:
We observed the field of GRB 150413A (C. B. Markwardt et al. GCN Circular #17688) with
the optical three color (g', Rc, and Ic) CCD cameras attached to the MITSuME 50 cm
telescope of Akeno Observatory, Yamanashi, Japan.
The observation started on 2015-04-13 15:58:02 UT (~2.1 h after the burst).
We detected the previously reported optical afterglow (K.Ivanov et al. GCN Circular #17689) in the Ic band.
The measured magnitudes are listed below.
T0+ MID-UT T-EXP[sec] g' Rc Ic
----------------------------------------------------------------------
263 min 4/13 18:17:28 240 > 17.3 > 17.2 16.09 +/- 0.30
2.04 days 4/15 14:52:50 15960 > 21.7 > 21.5 > 20.2
----------------------------------------------------------------------
T0+ : Elapsed time after the burst
T-EXP: Total Exposure time
We used GSC2.3 catalog for flux calibration.
GCN Circular 17718
Subject
GRB 150413A: ISON-Ussuriysk optical observations
Date
2015-04-17T21:33:14Z (10 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
E. Mazaeva (IKI), A. Stepura (UAFO, ISON), A. Matkin (UAFO, ISON), A.
Volnova (IKI), I. Molotov (KIAM), A. Pozanenko (IKI) report on behalf of
larger GRB follow-up collaboration:
We observed the field of the GRB 150413A (Markwardt et al., GCN 17688)
with SANTEL-650 (0.65m) telescope of UAFO/ISON-Ussuriysk observatory
sstarting on Apr., 14 (UT) 11:48:05. The afterglow (Ivanov et al., GCN
17689) is clearly detected in a combined image. Preliminary photometry the
unfiltered combined image is following
Date UT start t-T0 Filter Exp. OT OT_err
(mid, days) (s)
2015-04-14 11:48:05 0.95859 none 117*60 20.35 0.15
The photometry is based on nearby USNO-B1.0 stars
GCN Circular 17721
Subject
GRB 150413A: RTT150 optical observations
Date
2015-04-18T09:36:15Z (10 years ago)
From
Rodion Burenin at IKI, Moscow <rodion@hea.iki.rssi.ru>
I. Bikmaev, E. Irtuganov, N. Sakhibullin (KFU/AST),
R. Burenin, M. Pavlinsky, R. Sunyaev (IKI),
I. Khamitov, H. Kirbiyik (TUG), U. Kiziloglu (METU), E. Gogus (Sabanci Uni.)
report:
The field of the optical afterglow of GRB 150413A (Markwardt et al.,
GCN 17688, Ivanov et al., GCN 17689) was observed with Russian-Turkish
1.5-m telescope (RTT150, Bakirlitepe, TUBITAK National Observatory,
Turkey) using the TFOSC instrument.
We obtained series of Rc exposures in April 13/14 (50 frames x 300
sec, UT = 20:27 - 02:30 ) and in April 14/15 (4 frames x 600 sec,
UT = 22:43 - 00:28, in partially cloudy conditions). The optical
transient is clearly detected in each images.
Using USNO-B1 1618-0098185 star at RA,DEC = 12:41:09.18 +71:50:32.4
(J2000) with R2 = 15.59 mag as a reference we estimated the
R-magnitudes of the afterglow:
T-T0, Mag. +/- Mag.err
(days)
0.2932 17.39 +/- 0.03
0.5200 18.70 +/- 0.05
1.4318 21.4 +/- 0.2
RTT-150 light curve in April 13/14, 2015, can be found at:
http://hea.iki.rssi.ru/grb/150413a/indexeng.html
The break in the light curve at (T-T0) = 0.33 days is evident (break
is seen also in V-band data of Bassano Bresciano Observatory, Quadri
et al, GCN 17704).
Before the break at (T-T0) = 0.33 days, the power law decay index is
=~0.9, and it is close to 3.0 after that. Note, that decay index is
close to 2.0 after (T-T0) = 0.7 days. Therefore, there are multiple
breaks in the OT light curve.
GCN Circular 17723
Subject
GRB 150413A: Swift-XRT observations
Date
2015-04-20T09:26:50Z (10 years ago)
From
Claudio Pagani at U of Leicester <cp232@star.le.ac.uk>
J.P. Osborne (U. Leicester), K.L. Page (U. Leicester), C. Pagani (U.
Leicester), V. D'Elia (ASDC), M. de Pasquale (INAF-IASFPA), A. Maselli
(INAF-IASFPA), D.N. Burrows (PSU), J.A. Kennea (PSU), B. Sbarufatti
(INAF-OAB/PSU) and C. B. Markwardt (NASA/GSFC) report on behalf of the
Swift-XRT team:
We have analysed 6.2 ks of XRT data for the Swift/BAT-detected burst
GRB 150413A (Markwardt et al., GCN Circ. 17688). The data are entirely
in Photon Counting (PC) mode, collected between T0+303.3 ks and
T0+550.9 ks.
No X-ray sources have been detected inside or close to the Swift/BAT
error region. The 3-sigma upper limit at the position of the optical
afterglow (Ivanov et al., GCN Circ. 17689) is 0.003 ct s^-1,
corresponding to a 0.3-10 keV observed flux of 1.2e-13 erg cm^-2 s^-1
(assuming a typical GRB spectrum).
The results of the XRT-team automatic analysis of the XRT observations,
including a position-specific upper limit calculator, are available at
http://www.swift.ac.uk/ToO_GRBs/00637899.
This circular is an official product of the Swift-XRT team.
GCN Circular 17731
Subject
GRB 150413A: Konus-Wind and Swift/BAT joint spectral analysis
Date
2015-04-23T10:46:32Z (10 years ago)
From
Anastasia Tsvetkova at Ioffe Institute <tsvetkova@mail.ioffe.ru>
S. Golenetskii, R.Aptekar, D. Frederiks, V. Pal'shin, P. Oleynik,
M. Ulanov, D. Svinkin, A. Tsvetkova, A.Lysenko, and T. Cline
on behalf of the Konus-Wind team, and
T. Sakamoto (AGU), S. D. Barthelmy (GSFC), W. Baumgartner (GSFC/UMBC),
J. Cummings (GSFC/UMBC), E. Fenimore (LANL), N. Gehrels (GSFC),
H. Krimm (GSFC/USRA), C. Markwardt (GSFC), D. Palmer (LANL), M.
Stamatikos (OSU) and T. Ukwatta (GWU), report:
We performed the Konus-Wind and the Swift/BAT joint spectral analysis of
GRB 150413A
(Swift/BAT trigger #637899: Markwardt et al., GCN Circ. 17688; Stamatikos
et al., GCN Circ. 17701).
Since the Konus-Wind observed this GRB in the waiting mode, we only have 3
channel spectral data for
the Konus-Wind which cover the energy range from 20 keV to 1.2 MeV.
The joint spectral analysis of the Konus-Wind and the Swift/BAT data
allows us
to derive the broad-band spectral parameters of this burst.
The time intervals of the spectral data for each instrument are chosen
from T0(BAT)-102.150 s to T0(BAT)+159.866 s (the time-integrated spectrum)
and from T0(BAT)+95.098 s to T0(BAT)+118.650 s (the spectrum of the most
prominent pulse)
where T0(BAT) is the trigger time of BAT at 13:54:58 UTC.
The energy ranges which we used in the joint spectral analysis are 20-1200
keV and 15-150 keV
for the Konus-Wind and the Swift/BAT respectively. The spectral data of
two instruments
are fitted with the spectral model multiplied by the constant factor to
take into account
the systematic effective area uncertainties in the response matrices of
each instrument.
The spectrum of the most prominent pulse is well fitted with
a power-law with exponential cutoff model: dN/dE ~
E^{alpha}*exp(-(2+alpha)*E/Epeak).
No systematic residual from the best fit model is seen in the spectral
data of each instrument.
The BAT constant factor is 0.71(-0.12,+0.16) (the KW constant factor is
fixed to 1).
The best fit spectral parameters are:
alpha = -1.01(-0.44,+0.65), and
Epeak = 96(-22,+56) keV (chi2/dof = 60/57).
The best fit spectral parameters for the GRB (Band) model fixing beta =
-2.5 are:
alpha = -1.00(-0.51,+0.84), and
Epeak = 91(-26,+77) keV
(chi2/dof = 63/57).
The time-integrated spectrum is well fitted with a power-law model
with the the photon index 1.77(-0.09,+0.09), chi2/dof = 68/58.
The BAT constant factor is 0.70(-0.09,+0.11) (the KW constant factor is
fixed to 1).
The energy fluence in the 15-1200 keV band calculated by a power-law model
for this 262.016 s interval is 1.42(-0.19,+0.20)x10^-5 erg/cm2.
Assuming a redshift of 3.139 (de Ugarte Postigo and Tomasella, GCN Circ.
17710)
and a standard cosmology model with H_0 = 67.3 km/s/Mpc, Omega_M = 0.315,
Omega_Lambda = 0.685,
the isotropic energy release in the 1 keV - 10 MeV energy range is
E_iso = 6.53(-1.29,+1.62)x10^53 erg.
All the quoted errors are at the 90% confidence level.
The Konus-Wind light curve of this GRB is available at
http://www.ioffe.ru/LEA/GRBs/GRB150413A/
GCN Circular 17784
Subject
GRB 150413A: CrAO optical observations
Date
2015-04-28T19:47:55Z (10 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
V. Rumyantsev (CrAO), K. Antoniuk (CrAO), E. Mazaeva (IKI), A.
Pozanenko (IKI) report on behalf of larger GRB follow-up collaboration:
We observed the field of the GRB 150413A (Markwardt et al., GCN 17688)
with AZT-11 telescope of CrAO observatory starting on Apr. 13 (UT)
17:39:02. Several images were take in R-filter. The afterglow (Ivanov
et al., GCN 17689) is clearly detected in all single images of 180 s
exposure. Preliminary photometry is following
Date, UT start, OT, OT_err
2015-04-13 17 40 32.11 16.56 0.12
2015-04-13 17 43 36.17 16.97 0.30
2015-04-13 17 46 40.21 16.48 0.07
2015-04-13 17 49 44.26 16.73 0.11
2015-04-13 17 52 48.30 16.48 0.15
2015-04-13 17 55 52.37 16.62 0.13
2015-04-13 17 58 56.41 16.74 0.09
2015-04-13 18 02 00.58 16.63 0.13
2015-04-13 18 05 04.68 16.78 0.10
2015-04-13 18 08 08.76 16.77 0.09
2015-04-13 18 11 12.83 16.63 0.07
2015-04-13 18 14 16.87 16.74 0.06
2015-04-13 18 17 20.95 16.74 0.04
2015-04-13 18 20 25.30 16.76 0.06
2015-04-13 18 23 29.10 16.77 0.10
2015-04-13 18 26 33.15 16.90 0.08
2015-04-13 18 29 37.20 16.74 0.07
2015-04-13 18 32 41.25 16.71 0.05
2015-04-13 18 35 45.30 16.78 0.04
2015-04-13 18 38 49.36 16.77 0.03
2015-04-13 18 44 31.44 16.88 0.03
2015-04-13 18 47 35.48 16.81 0.03
2015-04-13 18 50 39.57 16.87 0.03
2015-04-13 18 53 43.66 16.92 0.03
2015-04-13 18 56 47.73 16.98 0.03
2015-04-13 18 59 51.90 17.02 0.03
2015-04-13 19 02 55.98 16.95 0.04
2015-04-13 19 06 00.64 16.94 0.04
2015-04-13 19 09 04.22 17.08 0.07
2015-04-13 19 12 08.35 17.05 0.06
The photometry is based on nearby USNO-B1.0 1618-0098185 (Xu et al.,
GCN 17693) assuming R=15.59.
GCN Circular 17797
Subject
GRB 150413A: AMI 15 GHz confirmation of radio counterpart
Date
2015-05-01T13:08:28Z (10 years ago)
From
Gemma Anderson at U of Oxford <Gemma.Anderson@physics.ox.ac.uk>
G. E. Anderson, R. P. Fender, T. D. Staley, K. Mooley (University of Oxford),
A. J. van der Horst (George Washington University), A. Rowlinson (CASS)
We re-observed the position of GRB 150413A (Markwardt et al., GCN 17688,
Ivanov et al., GCN 17689) at 15 GHz with the Arcminute Microkelvin Imager
(AMI-LA) following the possible detection of its radio counterpart reported
in Anderson et al., GCN 17708. This observation took place on 2015 April
15.798 to 15.964 UT, corresponding to 2.2 days post-burst, resulting in a flux
of 0.20 +/- 0.04 mJy. A follow-up AMI observation on 2015 April 23.947 to
24.114 UT, corresponding to 10.4 days post-burst, did not detection the radio
counterpart with a 3 sigma upper limit of 0.1 mJy. We therefore confirm that
the coincident radio source reported in Anderson et al., GCN 17708 is the
radio counterpart to GRB 150413A.
We thank the AMI staff for scheduling these observations.