TITLE: GCN CIRCULAR
NUMBER: 31789
SUBJECT: GRB 220325A: MASTER Global Robotic Net optical observations
DATE: 22/03/25 20:18:18 GMT
FROM: Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov(a)xray.sai.msu.ru>
V.Lipunov, D.Vlasenko, A.Kuznetsov, O.Gress, E.Gorbovskoy, N.Tyurina, P.Balanutsa, K.Zhirkov, A.Chasovnikov,
G.Antipov, V.Senik, D.Kuvshinov, V.Topolev,Ya.Kechin, Yu.Tselik (Lomonosov Moscow State University, SAI, Physics Department),
C.Francile, R. Podesta, C.Lopez, F. Podesta (Observatorio Astronomico Felix Aguilar OAFA),
D.A.H.Buckley (SAAO),
R. Rebolo, M. Serra (The Instituto de Astrofisica de Canarias),
L.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez, A.Corella,
L.H.Rodriguez (INAOE, Guillermo Haro Astrophysics Observatory),
N.M.Budnev (ISU,API),
A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory),
A. Gabovich, V.Yurkov (Blagoveschensk Educational State University)
MASTER-Amur robotic telescope (Global MASTER-Net: http://observ.pereplet.ru,Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L)
was pointed to the SWIFT GRB 220325A ( M. Ferro et al., GCN 31787) errorbox
3287 sec after notice time (3306 sec after trigger time)
at 2022-03-25 18:11:29 UT between rain with snow with upper limit up to 15.1 mag.
The observations started at zenith distance = 69 deg. The sun altitude was -28.4 deg.
The galactic latitude b = 8 deg., longitude l = 21 deg.
Real time updated cover map is available:
https://master.sai.msu.ru/site/master2/observ.php?id=1921440
The observation and reduction will continue.
The message may be cited.
TITLE: GCN CIRCULAR
NUMBER: 31788
SUBJECT: GRB 220324A: AstroSat CZTI detection
DATE: 22/03/25 17:47:32 GMT
FROM: Gaurav Waratkar at IIT,Bombay <gauravwaratkar(a)iitb.ac.in>
R. Gopalakrishnan (IUCAA), V. Prasad (IUCAA), G. Waratkar (IITB), A.
Vibhute (IUCAA), V. Bhalerao (IITB), D. Bhattacharya (IUCAA), A. R. Rao
(IUCAA/TIFR), and S. Vadawale (PRL) report on behalf of the AstroSat
CZTI collaboration:
Analysis of AstroSat CZTI data with the CIFT framework (Sharma et al.,
2021, JApA, 42, 73) showed detection of a long GRB 220324A which was
also detected by Fermi - GBM (Trigger Number - 669782349).
The source was clearly detected in the 20-200 keV energy range. The
light curve peaks at 2022-03-24 02:39:09.50 UT. The measured peak count
rate associated with the burst is 200 (+44, -28) counts/s above the
background in the combined data of all four quadrants, with a total of
2304 (+346, -331) counts. The local mean background count rate was 502
(+2, -2) counts/s. Using cumulative rates, we measure a T90 of 22 (+5,
-4) s.
It was also clearly detected in the CsI anticoincidence (Veto) detector
in the 100-500 keV energy range. The light curve showed a single peak of
emission at 2022-03-24 02:38:00.95 UT. The measured peak count rate is
169 (+83, -10) counts/s above the background in the combined Veto data
of four quadrants, with a total of 1428 (+566, -627) counts. The local
mean background count rate was 1687 (+5, -6) counts/s. We measure a T90
of 18 (+5, -9) s from the cumulative Veto light curve.
CZTI GRB detections are reported regularly on the payload site at
http://astrosat.iucaa.in/czti/?q=grb [1]. CZTI is built by a TIFR-led
consortium of institutes across India, including VSSC, ISAC, IUCAA, SAC,
and PRL. The Indian Space Research Organisation funded, managed, and
facilitated the project.
Links:
------
[1] http://astrosat.iucaa.in/czti/?q=grb
TITLE: GCN CIRCULAR
NUMBER: 31787
SUBJECT: GRB 220325A: Swift detection of a burst
DATE: 22/03/25 17:27:31 GMT
FROM: David Palmer at LANL <palmer(a)lanl.gov>
M. Ferro (INAF-OAB), M. G. Bernardini (INAF-OAB),
R. Brivio (INAF-OAB), P. D'Avanzo (INAF-OAB), J.D. Gropp (PSU),
J. A. Kennea (PSU), N. P. M. Kuin (UCL-MSSL), S. Laha (GSFC/UMBC),
F. E. Marshall (NASA/GSFC), K. L. Page (U Leicester),
D. M. Palmer (LANL), T. M. Parsotan (GSFC/UMBC/CRESSTII),
T. Sbarrato (INAF-OAB), B. Sbarufatti (PSU) and M. H. Siegel (PSU)
report on behalf of the Neil Gehrels Swift Observatory Team:
At 17:16:23 UT, the Swift Burst Alert Telescope (BAT) triggered and
located GRB 220325A (trigger=1099310). Swift slewed immediately to the burst.
The BAT on-board calculated location is
RA, Dec 269.485, -7.031 which is
RA(J2000) = 17h 57m 56s
Dec(J2000) = -07d 01' 50"
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 ~8 sec. The peak count rate
was ~2000 counts/sec (15-350 keV), at ~1 sec after the trigger.
The XRT began observing the field at 17:18:13.2 UT, 110.2 seconds after
the BAT trigger. Using promptly downlinked data we find a fading,
uncatalogued X-ray source located at RA, Dec 269.48760, -7.03776 which
is equivalent to:
RA(J2000) = 17h 57m 57.02s
Dec(J2000) = -07d 02' 15.9"
with an uncertainty of 3.9 arcseconds (radius, 90% containment). This
location is 26 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 https://www.swift.ac.uk/sper. No
spectrum from the promptly downlinked event data is yet available to
determine the column density.
UVOT took a finding chart exposure of 150 seconds with the White filter
starting 114 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
0.915.
Burst Advocate for this burst is M. Ferro (matteo.ferro 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/)
TITLE: GCN CIRCULAR
NUMBER: 31786
SUBJECT: GRB 220323A: AstroSat CZTI detection
DATE: 22/03/25 06:39:21 GMT
FROM: Gaurav Waratkar at IIT,Bombay <gauravwaratkar(a)iitb.ac.in>
R. Gopalakrishnan (IUCAA), V. Prasad (IUCAA), G. Waratkar (IITB), A.
Vibhute (IUCAA), V. Bhalerao (IITB), D. Bhattacharya (IUCAA), A. R. Rao
(IUCAA/TIFR), and S. Vadawale (PRL) report on behalf of the AstroSat
CZTI collaboration:
Analysis of AstroSat CZTI data with the CIFT framework (Sharma et al.,
2021, JApA, 42, 73) showed detection of a short GRB 220323A which was
also detected by Fermi - GBM (GCN 31782) and AGILE/MCAL (Ursi et al.,
GCN 31784).
The source was clearly detected in the 20-200 keV energy range. The
light curve peaks at 2022-03-23 12:10:10.55 UT. The measured peak count
rate associated with the burst is 1120 (+888, -4) counts/s above the
background in the combined data of three quadrants, with a total of 141
(+48, -50) counts. The local mean background count rate was 386 (+13,
-34) counts/s. Using cumulative rates, we measure a T90 of 0.32 (+0.22,
-0.15) s.
It was also detected in the CsI anticoincidence (Veto) detector in the
100-500 keV energy range.
CZTI GRB detections are reported regularly on the payload site at
http://astrosat.iucaa.in/czti/?q=grb [1]. CZTI is built by a TIFR-led
consortium of institutes across India, including VSSC, ISAC, IUCAA, SAC,
and PRL. The Indian Space Research Organisation funded, managed, and
facilitated the project.
Links:
------
[1] http://astrosat.iucaa.in/czti/?q=grb
TITLE: GCN CIRCULAR
NUMBER: 31785
SUBJECT: GRB 220319A: GRANDMA observations
DATE: 22/03/24 14:29:52 GMT
FROM: Marie Anne Bizouard at ARTEMIS/CNRS <marieanne.bizouard(a)oca.eu>
M. Bizouard (OCA/Artemis), P-A. Duverne (IJCLAB), A. Iskandar (XAO),
D. Datashvili (AbAO), M. Blazek (FZU), D. Turpin (CEA), T. Midavaine (KNC)
S. Antier (OCA/Artemis), I. Tosta eMelo (INFN-LNS), X. F. Wang (TSU/BJP),
J. Zhu (BJP), X. Song (BJP), S. Karpov (FZU), A. Kann (IAA-CSIC),
D. Marchais (KNC), A. Popowicz (KNC), A. Oksanen (KNC), M. Serrau (KNC),
M. Freeberg (KNC), A. Klotz (IRAP-OMP), R. Kneip (KNC), E. Broens (KNC),
O. Aguerre (KNC), report on behalf of the GRANDMA collaboration:
The GRANDMA telescope network responded to the alert of GRB 220319A
(Page et al.
GCN 31769). The first observations started 14 min after the BAT trigger
time.
No new object was detected within the XRT enhanced error region (Goad et
al. GCN
31771). The observations were affected by the nearby full Moon and in
some cases
also by Sahara dust.
In the following table we report the preliminary photometry of our
observations.
Upper limits are reported at the 3-sigma limit, in the AB system.
T-T0 (hr)| MJD | Observatory| Filter| Upp.Mag.
____________________________________________________
0.23 |59657.746539| KNC-HAN | Lum | 18.6
0.94 |59657.775880| KNC-HAN | Lum | 18.7
1.38 |59657.794039| KNC-TJML | Clear | 15.7
2.79 |59657.852604| KNC-T-BRO | Clear | 18.6
2.89 |59657.856921| KNC-K26 | Lumen | 18.2
4.01 |59657.903715| KNC-T-CAT | Blue | 19.4
4.01 |59657.903715| KNC-T-CAT | Green | 19.5
4.01 |59657.903715| KNC-T-CAT | Red | 18.2
5.47 |59657.964502| KNC-TJMS-PS| Lumen | 20.0
5.62 |59657.970540| ALi-50 | Clear | 20.1
7.22 |59658.037350| KNC-T-AGU | Lum | 18.8
10.85|59658.188623| C11FREE | Rc | 18.7
Most of these observations were performed in the context of the
Kilonova-Catcher
programme (KNC), a professional-amateur collaboration within the GRANDMA
project, and in some cases using non-standard filters. The KNC
images have been
processed using the MUPHOTEN pipeline (Duverne et al. 2021) and
photometry was
performed using field stars from the PanSTARRS catalogue as reference.
GRANDMA is a worldwide coordinated telescope network
(grandma.ijclab.in2p3.fr)
devoted to the observation of transients in the context of multi-messenger
astrophysics (Antier et al. 2020 MNRAS 497, 5518). Kilonova-Catcher (KNC)
is the citizen science program of GRANDMA
(http://kilonovacatcher.in2p3.fr/).
TITLE: GCN CIRCULAR
NUMBER: 31784
SUBJECT: GRB 220323A: AGILE/MCAL detection
DATE: 22/03/23 15:14:50 GMT
FROM: Alessandro Ursi at INAF/IAPS <alessandro.ursi(a)gmail.com>
A. Ursi (INAF/IAPS), M. Romani (INAF/OA-Brera), C. Pittori, F. Verrecchia
(SSDC, and INAF/OAR), M. Tavani (INAF/IAPS, and Univ. Roma Tor Vergata), A.
Argan, M. Cardillo, C. Casentini, Y. Evangelista, L. Foffano, E. Menegoni,
G. Piano (INAF/IAPS), F. Lucarelli (SSDC, and INAF/OAR), A. Bulgarelli, A.
Di Piano, V. Fioretti, F. Fuschino, N. Parmiggiani (INAF/OAS-Bologna), M.
Marisaldi (INAF/OAS-Bologna, and Bergen University), M. Pilia, A. Trois
(INAF/OA-Cagliari), I. Donnarumma (ASI), A. Giuliani (INAF/IASF-Mi), F.
Longo (Univ. Trieste and INFN Trieste), and P. Tempesta (TeleSpazio),
report on behalf of the AGILE Team:
The AGILE MiniCALorimeter (MCAL; 0.4-100 MeV) detected the short GRB
220323A at T0 = 2022-03-23 12:10:11 (UTC), reported by Fermi GBM (GCN
#31782).
The event lasted 0.35 s and released 295 counts in the detector, above a
background rate of 630 Hz. The time-integrated spectrum of the burst can be
fitted in the energy range 0.4-2 MeV with a power-law with ph.ind = 2.44
(-0.70/+1.13), resulting in a reduced chi-squared of 1.06 (21 d.o.f.) and a
fluence of 5.6e-07 erg/cm^2 (90% confidence level), in the same energy
range. The MCAL light curve can be found at
http://www.agilescienceapp.it/notices/077531_GRB_575122215.552228.png . At
the T0, the event was 134 deg off-axis.
The burst is also clearly visible in the AGILE scientific ratemeters of the
MCAL detector, where it released a total number of 1550 counts (above a
background rate of 1230 Hz). The AGILE MCAL ratemeters light curve can be
found at http://www.agilescienceapp.it/notices/GRB220323A_AGILE_RM.png .
Additional analysis of AGILE data is in progress. Automatic MCAL GRB alert
Notices can be found at: https://gcn.gsfc.nasa.gov/agile_mcal.html. Please
note that in the MCAL notice #575122215 the T0 was affected by a temporal
shift of about +4.0 sec due to episodic automated ground software problems
which are then corrected offline.
TITLE: GCN CIRCULAR
NUMBER: 31783
SUBJECT: IPN triangulation of GRB 220320A
DATE: 22/03/23 12:27:20 GMT
FROM: Dmitry Svinkin at Ioffe Institute <svinkin(a)mail.ioffe.ru>
A.S. Kozyrev, D.V. Golovin, M.L. Litvak, I.G. Mitrofanov, and A.B. Sanin
on behalf of the MGNS/BepiColombo and HEND/Mars Odyssey teams,
J. Benkhoff on behalf of the BepiColombo team,
D. Svinkin, D. Frederiks, A. Ridnaia, A. Lysenko,
and T. Cline on behalf of the Konus-Wind team,
A. Goldstein, M. S. Briggs, and C. Wilson-Hodge
on behalf of the Fermi GBM team,
E. Bozzo and C. Ferrigno, on behalf of the INTEGRAL SPI-ACS GRB team,
and
W. Boynton, C. Fellows, K. Harshman, H. Enos, R. Starr,
and A.S. Gardner on on behalf of the GRS-Odyssey GRB team,
report:
The bright, long-duration GRB 220320A
(AstroSat-CZTI detection: Gopalakrishnan et al., GCN Circ. 31779)
was detected by Fermi (GBM trigger 669443999), Konus-Wind,
INTEGRAL (SPI-ACS), Mars-Odyssey (HEND), BepiColombo (MGNS),
CALET (CGBM), and AstroSat (CZTI) at about 16794 s UT (04:39:54).
We have triangulated it to a preliminary, 3 sigma error box
whose coordinates are:
---------------------------------------------
RA(2000), deg Dec(2000), deg
---------------------------------------------
Center:
94.150 (06h 16m 36s) -55.909 (-55d 54' 31")
Corners:
94.226 (06h 16m 54s) -55.949 (-55d 56' 58")
94.048 (06h 16m 12s) -55.915 (-55d 54' 54")
94.074 (06h 16m 18s) -55.868 (-55d 52' 04")
94.252 (06h 17m 00s) -55.902 (-55d 54' 08")
---------------------------------------------
The error box area is 19 sq. arcmin, and its maximum
dimension is 7 arcmin (the minimum one is 3 arcmin).
The Sun distance was 92 deg.
This box may be improved.
The IPN localization is consistent with, but reduces the area of, the
Fermi GBM final position.
A triangulation map is posted at
http://www.ioffe.ru/LEA/GRBs/GRB220320_T16796/IPN
The Konus-Wind time history and spectrum will be given
in a forthcoming GCN Circular.
TITLE: GCN CIRCULAR
NUMBER: 31782
SUBJECT: GRB 220323A: Fermi GBM Final Real-time Localization
DATE: 22/03/23 12:20:36 GMT
FROM: Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply(a)GIOC.nsstc.nasa.gov>
The Fermi GBM team reports the detection of a likely SHORT GRB
At 12:10:11 UT on 23 Mar 2022, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 220323A (trigger 669730216.566582 / 220323507).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 355.2, Dec = 71.9 (J2000 degrees, equivalent to J2000 23h 40m, 71d 54'), with a statistical uncertainty of 9.9 degrees.
The angle from the Fermi LAT boresight is 25.0 degrees.
The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2022/bn220323507/…
The HEALPix FITS file, including the estimated localization systematic, can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2022/bn220323507/…
The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2022/bn220323507/…
TITLE: GCN CIRCULAR
NUMBER: 31781
SUBJECT: GRB 220319A: Swift-BAT refined analysis
DATE: 22/03/22 15:40:46 GMT
FROM: Sibasish Laha at GSFC <sibasish.laha(a)nasa.gov>
H. A. Krimm (NSF), S. D. Barthelmy (GSFC),
S. Laha (GSFC/UMBC), A. Y. Lien (U Tampa),
C. B. Markwardt (GSFC), D. M. Palmer (LANL),
T. Parsotan (GSFC/UMBC), T. Sakamoto (AGU),
M. Stamatikos (OSU) (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 220319A (trigger #1098132)
(Page et al., GCN Circ. 31769). The BAT ground-calculated position is
RA, Dec = 218.139, 61.291 deg which is
RA(J2000) = 14h 32m 33.4s
Dec(J2000) = +61d 17' 26.6"
with an uncertainty of 1.9 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 43%.
The BAT light curve showed a single-peaked
structure with a duration of about 10 sec.
T90 (15-350 keV) is 6.44 +- 1.54 sec (estimated error including systematics).
The time-averaged spectrum from T-0.36 to T+6.56 sec is best fit by a simple
power-law model. The power law index of the time-averaged spectrum is
2.15 +- 0.28. The fluence in the 15-150 keV band is 2.3 +- 0.4 x 10^-07 erg/cm2.
The 1-sec peak photon flux measured from T-0.24 sec in the 15-150 keV band
is 1.5 +- 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/1098132/BA/
TITLE: GCN CIRCULAR
NUMBER: 31780
SUBJECT: GRB 220316A: AstroSat CZTI detection
DATE: 22/03/22 13:32:56 GMT
FROM: Gaurav Waratkar at IIT,Bombay <gauravwaratkar(a)iitb.ac.in>
R. Gopalakrishnan (IUCAA), V. Prasad (IUCAA), G. Waratkar (IITB), A.
Vibhute (IUCAA), V. Bhalerao (IITB), D. Bhattacharya (IUCAA), A. R. Rao
(IUCAA/TIFR), and S. Vadawale (PRL) report on behalf of the AstroSat
CZTI collaboration:
Analysis of AstroSat CZTI data with the CIFT framework (Sharma et al.,
2021, JApA, 42, 73) showed detection of a long GRB 220316A which was
also detected by Fermi - GBM (TrigNum - 669122742), and Konus - Wind
(GCN Notices).
The source was clearly detected in the 20-200 keV energy range. The
light curve showed multiple peaks of emission with the strongest peak at
2022-03-16 11:25:40.5 UT. The measured peak count rate associated with
the burst is 266 (+48, -18) counts/s above the background in the
combined data of three quadrants, with a total of 2313 (+321, -294)
counts. The local mean background count rate was 361 (+2, -3) counts/s.
Using cumulative rates, we measure a T90 of 30 (+6, -4) s.
It was also clearly detected in the CsI anticoincidence (Veto) detector
in the 100-500 keV energy range. The light curve showed multiple peaks
of emission with the strongest peak at 2022-03-16 11:25:39.22 UT. The
measured peak count rate is 887 (+76, -73) counts/s above the
background in the combined Veto data of four quadrants, with a total of
4547 (+524, -584) counts. The local mean background count rate was 1454
(+4, -4) counts/s. We measure a T90 of 25 (+5, -2) s from the cumulative
Veto light curve.
CZTI GRB detections are reported regularly on the payload site at
http://astrosat.iucaa.in/czti/?q=grb [1]. CZTI is built by a TIFR-led
consortium of institutes across India, including VSSC, ISAC, IUCAA, SAC,
and PRL. The Indian Space Research Organisation funded, managed, and
facilitated the project.
Links:
------
[1] http://astrosat.iucaa.in/czti/?q=grb