TITLE: GCN CIRCULAR
NUMBER: 36993
SUBJECT: GRB 240730C: AstroSat CZTI detection of a long burst
DATE: 24/07/31 22:07:07 GMT
FROM: Gaurav Waratkar at IIT Bombay <gauravwaratkar(a)iitb.ac.in>
A. Dasgupta (BITS Pilani, Hyderabad), S. Srijan (IITB), G. Waratkar (IITB), J. Joshi (IUCAA), A. Vibhute (IUCAA), V. Bhalerao (IITB), D. Bhattacharya (Ashoka University/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 the detection of a long-duration GRB 240730C which was also detected by Konus/WIND (TrigID 2052170822). Inspection of INTEGRAL/SPI-ACS data also showed the detection of the burst.
The source was detected in the CZT detectors in the 20-200 keV energy range. The light curve peaks at 2024-07-30 19:40:34.5 UTC. The measured peak count rate associated with the burst is 99 (+38, -9) counts/s above the background in the combined data of all quadrants, with a total of 990 (+222, -239) counts. The local mean background count rate was 289 (+3, -4) counts/s. Using cumulative rates, we measure a T90 of 16 (+5, -2) s.
It was also clearly detected in the CsI anticoincidence (Veto) detector in the 100-500 keV energy range. The light curve peaks at 2024-07-30 19:40:38.4 UTC. The measured peak count rate is 541 (+72, -51) counts/s above the background in the combined Veto data of all quadrants, with a total of 4838 (+562, -640) counts. The local mean background count rate was 1235 (+10, -10) counts/s. We measure a T90 of 19 (+1, -1) s from the cumulative Veto light curve.
CZTI is built by a TIFR-led consortium of institutes across India, including VSSC, URSC, IUCAA, SAC, and PRL. The Indian Space Research Organisation funded, managed, and facilitated the project.
CZTI GRB detections are reported regularly on the payload site at:
http://astrosat.iucaa.in/czti/?q=grb
View this GCN Circular online at https://gcn.nasa.gov/circulars/36993.
---
To unsubscribe, open this link in a web browser:
https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…
TITLE: GCN CIRCULAR
NUMBER: 36990
SUBJECT: Fermi trigger No 744083370: Global MASTER-Net observations report
DATE: 24/07/31 20:30:49 GMT
FROM: Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov(a)xray.sai.msu.ru>
V. Lipunov, V.Kornilov, E. Gorbovskoy, K. Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, V.Senik, D. Vlasenko,
G.Antipov, D.Zimnukhov, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D. Cheryasov, Ya.Kechin, Yu.Tselik, A. Sosnovskij
(Lomonosov Moscow State University, SAI, Physics Department),
R. Podesta, C.Lopez, F. Podesta, C.Francile
(Observatorio Astronomico Felix Aguilar OAFA),
R. Rebolo, M. Serra
(The Instituto de Astrofisica de Canarias),
D. Buckley
(South African Astronomical Observatory),
O.A. Gress, N.M. Budnev, O.Ershova
(Irkutsk State University, API),
L.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez,
A.R.Corella, L.H.Rodriguez
(INAOE, Guillermo Haro Astrophysics Observatory),
A. Tlatov, D. Dormidontov
(Kislovodsk Solar Station of the Pulkovo Observatory),
V. Yurkov, A. Gabovich
(Blagoveschensk Educational State University)
MASTER-Tavrida robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Lomonosov MSU, SAI Crimea astronomical station) started inspect of the Fermi GRB240731.08 (trigger No 744083370,10h 25m 52.80s , +33d 57m 00.0s, R=7.3) errorbox 64257 sec after notice time and 64262 sec after trigger time at 2024-07-31 19:40:28 UT, with upper limit up to 17.5 mag. The observations began at zenith distance = 81 deg. The sun altitude is -21.3 deg.
The galactic latitude b = 59 deg., longitude l = 192 deg.
Real time updated cover map and OT discovered available here:
https://master.sai.msu.ru/site/master2/observ.php?id=2546590
We obtain a following upper limits.
Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment
_________|_____________________|_____________________|____________________________________|_____|_______|_______|________
64293 | 2024-07-31 19:40:28 | MASTER-Tavrida | (10h 37m 12.36s , +38d 34m 56.5s) | C | 60 | 17.4 |
64370 | 2024-07-31 19:41:45 | MASTER-Tavrida | (10h 54m 01.42s , +35d 59m 11.0s) | C | 60 | 17.0 |
64445 | 2024-07-31 19:43:00 | MASTER-Tavrida | (10h 52m 12.10s , +37d 17m 13.5s) | C | 60 | 17.4 |
64522 | 2024-07-31 19:44:17 | MASTER-Tavrida | (10h 35m 36.15s , +39d 52m 33.0s) | C | 60 | 17.3 |
64598 | 2024-07-31 19:45:33 | MASTER-Tavrida | (10h 50m 30.29s , +38d 34m 20.7s) | C | 60 | 17.4 |
64761 | 2024-07-31 19:48:17 | MASTER-Tavrida | (10h 49m 11.05s , +39d 53m 20.9s) | C | 60 | 17.5 |
Filter C is a clear (unfiltred) band.
The observation and reduction will continue.
The message may be cited.
View this GCN Circular online at https://gcn.nasa.gov/circulars/36990.
---
To unsubscribe, open this link in a web browser:
https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…
TITLE: GCN CIRCULAR
NUMBER: 36989
SUBJECT: GRB 240731A: AstroSat CZTI detection
DATE: 24/07/31 19:41:44 GMT
FROM: Gaurav Waratkar at IIT Bombay <gauravwaratkar(a)iitb.ac.in>
S. Srijan (IITB), A. Dasgupta (BITS Pilani, Hyderabad), G. Waratkar (IITB), J. Joshi (IUCAA), A. Vibhute (IUCAA), V. Bhalerao (IITB), D. Bhattacharya (Ashoka University/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 the detection of GRB 240731A which was also detected by Fermi/GBM (Trigger 744128417) and INTEGRAL/SPI-ACS (Trigger 10826).
The source was detected in the CsI anticoincidence (Veto) detector in the 100-500 keV energy range. The light curve peaks at 2024-07-31 14:20:13.3 UTC. The measured peak count rate is 364 (+70, -74) counts/s above the background in the combined Veto data of all quadrants, with a total of 672 (+315, -330) counts. The local mean background count rate was 1305 (+13, -14) counts/s. We measure a T90 of 3.4 (+2.9, -2.4) s from the cumulative Veto light curve.
CZTI is built by a TIFR-led consortium of institutes across India, including VSSC, URSC, IUCAA, SAC, and PRL. The Indian Space Research Organisation funded, managed, and facilitated the project.
CZTI GRB detections are reported regularly on the payload site at:
http://astrosat.iucaa.in/czti/?q=grb
View this GCN Circular online at https://gcn.nasa.gov/circulars/36989.
---
To unsubscribe, open this link in a web browser:
https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…
TITLE: GCN CIRCULAR
NUMBER: 36988
SUBJECT: GRB 240730A: Osservatorio Astronomico Nastro Verde upper limit
DATE: 24/07/31 19:31:53 GMT
FROM: Nello Ruocco at Osservatorio Nastro Verde - Sorrento (Naples) - Italy - MPC Code C82 <osservatorionastroverde(a)gmail.com>
Nello Ruocco at Osservatorio Nastro Verde - Sorrento (Naples) - Italy
in a large collaboration with:
M.G. Dainotti (National Astronomical Observatory of Japan),
Y. Niino (Tokyo University, Institute of Astronomy),
K. Kalinowski (Aarhus University, Department of Physics and Astronomy),
B. De Simone (Universita' degli Studi Di Salerno)
report:
We image the field of GRB 240730A (Trigger 1245636 S. B. Cenko (GSFC), P. A. Evans (U Leicester),
R. A. J. Eyles-Ferris (U Leicester), K. L. Page (U Leicester) and
D. M. Palmer (LANL) GCN Circular 36976)
with telescope of Nastro Verde Observatory - Sorrento (Naples), Italy. Member of:
AAVSO - American Association of Variable Star Observers.
UAI/SSV - Unione Astrofili Italiani/sezione stelle variabili.
AstroCampania Associazione
The observations started at 22:08 UT of 2024/07/30, after about 14.20 hours after the GRB trigger, with clear sky,
with principal telescope SC 0.35 f/10 with focal reduced + CCD Sbig ST10 XME
I took 20 image of 60 sec each. All images are unfiltered, calibrated with masterdark and masterflat,stacked with Tycho Tracker software
We have not detected any clearly visible sources, up to 19.5th magnitude with clear skies.
Start T0+ End T0+ Rlim
22:08:20 UT 22:32:39 UT 19.5
We did not found any optical counterpart in the error box of the XRTcandidate.
Magnitudes were estimated with the Gaia DR2 cat. and
are not corrected for galactic dust extinction.
The message may be cited.
View this GCN Circular online at https://gcn.nasa.gov/circulars/36988.
---
To unsubscribe, open this link in a web browser:
https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…
TITLE: GCN CIRCULAR
NUMBER: 36987
SUBJECT: GRB240730A: BOOTES-5/JGT early optical upper limit
DATE: 24/07/31 04:48:14 GMT
FROM: Alberto Castro-Tirado at Inst.de Astro. de Andalucia <ajct(a)iaa.es>
S. Guziy, E. Fernandez-Garcia, I. Perez-Garcia, M.D. Caballero-Garcia, R. Sanchez-Ramirez, S.-Y. Wu and A. J. Castro-Tirado (IAA-CSIC, Granada), Y.-D. Hu (INAF-OAB), D. Hiriart and W. H. Lee (UNAM), C. J. Perez del Pulgar (UMA), I. M. Carrasco-Garcia (SMA) and I. H. Park (SKKU), on behalf of a larger collaboration, report:
Following the detection of GRB 240730A by Swift (Cenko et al. GCNC 36976), the BOOTES-5/JGT 0.6m robotic telescope at Observatorio Astronomico Nacional in San Pedro Martir (Mexico) automatically observed the GRB location starting on Jul. 30, 07:53:50 UT (~ 104 s after trigger). No new optical source is detected on the co-added images (57 x 1 s, clear-filter) within the enhanced Swift/XRT error box (Evans et al. GCNC 36977) down to 18.7 mag. which is consistent with reports from UVOT (Kuin et al., GCNC 36978), KAIT (Zheng et al., GCNC 36980) and MASTER (Lipunov et al. GCNC 36983).
We thank the staff at Observatorio Astronomico Nacional in San Pedro Martir for their excellent support.
View this GCN Circular online at https://gcn.nasa.gov/circulars/36987.
---
To unsubscribe, open this link in a web browser:
https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…
TITLE: GCN CIRCULAR
NUMBER: 36986
SUBJECT: Fermi Gamma-ray Burst Monitor trigger 744061103/240730818 is not a GRB
DATE: 24/07/30 21:11:52 GMT
FROM: Sarah Dalessi at UAH <sd0104(a)uah.edu>
S. Dalessi (UAH) reports on behalf of the Fermi Gamma-ray Burst Monitor Team:
"The Fermi Gamma-ray Burst Monitor (GBM) trigger 744061103/240730818 at 19:38:18.37 UT
on 30 July 2024, tentatively classified as a GRB, is in fact not due
to a GRB. This trigger is likely due to solar flare."
View this GCN Circular online at https://gcn.nasa.gov/circulars/36986.
---
To unsubscribe, open this link in a web browser:
https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…
TITLE: GCN CIRCULAR
NUMBER: 36985
SUBJECT: Fermi GRB 240730B: Global MASTER-Net observations report
DATE: 24/07/30 20:30:44 GMT
FROM: Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov(a)xray.sai.msu.ru>
V. Lipunov, V.Kornilov, E. Gorbovskoy, K. Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, V.Senik, D. Vlasenko,
G.Antipov, D.Zimnukhov, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D. Cheryasov, Ya.Kechin, Yu.Tselik, A. Sosnovskij
(Lomonosov Moscow State University, SAI, Physics Department),
R. Podesta, C.Lopez, F. Podesta, C.Francile
(Observatorio Astronomico Felix Aguilar OAFA),
R. Rebolo, M. Serra
(The Instituto de Astrofisica de Canarias),
D. Buckley
(South African Astronomical Observatory),
O.A. Gress, N.M. Budnev, O.Ershova
(Irkutsk State University, API),
L.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez,
A.R.Corella, L.H.Rodriguez
(INAOE, Guillermo Haro Astrophysics Observatory),
A. Tlatov, D. Dormidontov
(Kislovodsk Solar Station of the Pulkovo Observatory),
V. Yurkov, A. Gabovich
(Blagoveschensk Educational State University)
MASTER-SAAO robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in South Africa (South African Astronomical Observatory) started inspect of the Fermi GRB 240730B ( Fermi GBM team, GCN 36984) errorbox 576 sec after notice time and 588 sec after trigger time at 2024-07-30 19:48:06 UT, with upper limit up to 19.2 mag. The observations began at zenith distance = 82 deg. The sun altitude is -48.0 deg.
The galactic latitude b = 80 deg., longitude l = 10 deg.
Real time updated cover map and OT discovered available here:
https://master.sai.msu.ru/site/master2/observ.php?id=2546199
We obtain a following upper limits.
Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment
_________|_____________________|_____________________|____________________________________|_____|_______|_______|________
618 | 2024-07-30 19:48:06 | MASTER-SAAO | (13h 29m 10.06s , +23d 17m 14.3s) | C | 60 | 18.6 |
678 | 2024-07-30 19:48:06 | MASTER-SAAO | (13h 29m 10.06s , +23d 17m 14.4s) | C | 180 | 19.2 | Coadd
697 | 2024-07-30 19:49:25 | MASTER-SAAO | (13h 29m 09.53s , +23d 17m 20.0s) | C | 60 | 18.5 |
776 | 2024-07-30 19:50:44 | MASTER-SAAO | (13h 29m 09.12s , +23d 17m 24.9s) | C | 60 | 18.5 |
855 | 2024-07-30 19:52:03 | MASTER-SAAO | (13h 29m 08.65s , +23d 17m 31.0s) | C | 60 | 18.6 |
Filter C is a clear (unfiltred) band.
The observation and reduction will continue.
The message may be cited.
View this GCN Circular online at https://gcn.nasa.gov/circulars/36985.
---
To unsubscribe, open this link in a web browser:
https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…