December 2024 - vsnet-grb-info - ooruri.kusastro.kyoto-u.ac.jp

[vsnet-grb-info 36498] GRB 241209B: BOOTES-5 optical upper limit
by GCN Circulars 09 Dec '24

09 Dec '24

TITLE: GCN CIRCULAR NUMBER: 38499 SUBJECT: GRB 241209B: BOOTES-5 optical upper limit DATE: 24/12/09 21:04:22 GMT FROM: ipg(a)iaa.es I. Perez-Garcia, E. J. Fernandez-Garcia, G. Garcia-Segura, M. D. Caballero-Garcia, S.-Y. Wu, R. Sanchez-Ramirez, S. Guziy and A. J. Castro-Tirado (IAA-CSIC, Granada), C. Perez del Pulgar, A. Castellon (Univ. de Malaga), Y.-D. Hu (INAF-OAB, Brera), S. Jeong (ADD, Daejeon) and D. Hiriart and W. H. Lee (UNAM), on behalf of a larger collaboration, report: Following the detection of GRB 241209B by SVOM/ECLAIRs (Xie et al. GCNC [38478](https://gcn.nasa.gov/circulars/38478)), the 0.6m BOOTES-5/JG robotic telescope at Observatorio Astronomico Nacional in San Pedro Martir (Mexico) observed the GRB location starting on Dec 09, 07:01 UT (3.1 hours after trigger and 30 minutes after notification) in different optical bands. No new optical source is detected on the co-added images (15x60s, clear-filter) within the SVOM/ECLAIRs error box down to 20.3 mag. 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/38499. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 36497] Swift GRB 241209D: Global MASTER-Net observations report
by GCN Circulars 09 Dec '24

09 Dec '24

TITLE: GCN CIRCULAR NUMBER: 38498 SUBJECT: Swift GRB 241209D: Global MASTER-Net observations report DATE: 24/12/09 20:56:46 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov(a)xray.sai.msu.ru> V.Lipunov, E.Gorbovskoy, N.Tiurina, P.Balanutsa, , D.Vlasenko, I.Panchenko, A.Kuznetsov, G.Antipov, A.Sankovich, A.Sosnovskij, Yu.Tselik, M.Gulyaev, Ya.Kechin, V.Senik, A.Chasovnikov, K.Labsina, I. Gorbunov (Lomonosov MSU), O.Gress, N.Budnev (ISU), C.Francile, F. Podesta, R.Podesta, E. Gonzalez (Observatorio Astronomico Felix Aguilar (OAFA), A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory), A. Gabovich, V.Yurkov (Blagoveschensk Educational StateUniversity) D.Buckley (SAAO), R.Rebolo (The Instituto de Astrofisica de Canarias), L.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez, A.R.Corella, L.H.Rodriguez (INAOE, Guillermo Haro Astrophysics Observatory) MASTER-Tunka robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Applied Physics Institute, Irkutsk State University) was pointed to the Swift GRB 241209D ( T. M. Parsotan et al., GCN 38489) errorbox 33929 sec after notice time and 33951 sec after trigger time at 2024-12-09 20:25:37 UT, with upper limit up to 18.8 mag. The observations began at zenith distance = 75 deg. The sun altitude is -41.5 deg. The galactic latitude b = 60 deg., longitude l = 299 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2701233 We obtain a following upper limits. Tmid-T0 | Site |Filt.| Expt. | Limit| Comment _________|_____________________|_____|_______|______|________ 34041 | MASTER-Tunka | C | 180 | 15.0 | 35265 | MASTER-Tunka | C | 180 | 18.8 | 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/38498. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 36496] Fermi GRB 241209C: Global MASTER-Net observations report
by GCN Circulars 09 Dec '24

09 Dec '24

TITLE: GCN CIRCULAR NUMBER: 38497 SUBJECT: Fermi GRB 241209C: Global MASTER-Net observations report DATE: 24/12/09 19:30:49 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov(a)xray.sai.msu.ru> V.Lipunov, E.Gorbovskoy, N.Tiurina, P.Balanutsa, , D.Vlasenko, I.Panchenko, A.Kuznetsov, G.Antipov, A.Sankovich, A.Sosnovskij, Yu.Tselik, M.Gulyaev, Ya.Kechin, V.Senik, A.Chasovnikov, K.Labsina, I. Gorbunov (Lomonosov MSU), O.Gress, N.Budnev (ISU), C.Francile, F. Podesta, R.Podesta, E. Gonzalez (Observatorio Astronomico Felix Aguilar (OAFA), A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory), A. Gabovich, V.Yurkov (Blagoveschensk Educational StateUniversity) D.Buckley (SAAO), R.Rebolo (The Instituto de Astrofisica de Canarias), L.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez, A.R.Corella, L.H.Rodriguez (INAOE, Guillermo Haro Astrophysics Observatory) MASTER-Kislovodsk robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) started inspect of the Fermi GRB 241209C ( Fermi GBM team, GCN 38482) errorbox 41800 sec after notice time and 41825 sec after trigger time at 2024-12-09 18:59:59 UT, with upper limit up to 17.5 mag. The observations began at zenith distance = 76 deg. The sun altitude is -57.6 deg. The galactic latitude b = 12 deg., longitude l = 220 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2701134 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 41855 | 2024-12-09 18:59:59 | MASTER-Kislovodsk | (07h 45m 09.49s , -00d 33m 01.9s) | C | 60 | 16.5 | 41935 | 2024-12-09 19:01:19 | MASTER-Kislovodsk | (07h 53m 08.72s , -00d 32m 20.8s) | C | 60 | 16.9 | 42097 | 2024-12-09 19:04:01 | MASTER-Kislovodsk | (07h 45m 10.51s , -00d 34m 01.9s) | C | 60 | 17.3 | 42177 | 2024-12-09 19:05:21 | MASTER-Kislovodsk | (07h 53m 14.71s , -00d 34m 16.8s) | C | 60 | 16.9 | 42339 | 2024-12-09 19:08:03 | MASTER-Kislovodsk | (07h 45m 12.59s , -00d 33m 47.5s) | C | 60 | 16.8 | 42418 | 2024-12-09 19:09:22 | MASTER-Kislovodsk | (07h 29m 57.54s , -00d 32m 27.7s) | C | 60 | 17.3 | 42497 | 2024-12-09 19:10:42 | MASTER-Kislovodsk | (07h 37m 56.59s , -00d 31m 43.1s) | C | 60 | 17.5 | 42656 | 2024-12-09 19:13:21 | MASTER-Kislovodsk | (07h 37m 57.58s , -00d 33m 39.4s) | C | 60 | 17.5 | 42736 | 2024-12-09 19:14:40 | MASTER-Kislovodsk | (07h 30m 03.51s , -00d 33m 16.2s) | C | 60 | 17.3 | 42982 | 2024-12-09 19:18:46 | MASTER-Kislovodsk | (07h 53m 15.57s , -00d 32m 07.6s) | C | 60 | 16.9 | 43228 | 2024-12-09 19:22:52 | MASTER-Kislovodsk | (07h 53m 15.43s , -00d 32m 37.7s) | C | 60 | 16.8 | 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/38497. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 36495] Fermi GRB 241209E: Global MASTER-Net observations report
by GCN Circulars 09 Dec '24

09 Dec '24

TITLE: GCN CIRCULAR NUMBER: 38496 SUBJECT: Fermi GRB 241209E: Global MASTER-Net observations report DATE: 24/12/09 19:15:54 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov(a)xray.sai.msu.ru> V.Lipunov, E.Gorbovskoy, N.Tiurina, P.Balanutsa, , D.Vlasenko, I.Panchenko, A.Kuznetsov, G.Antipov, A.Sankovich, A.Sosnovskij, Yu.Tselik, M.Gulyaev, Ya.Kechin, V.Senik, A.Chasovnikov, K.Labsina, I. Gorbunov (Lomonosov MSU), O.Gress, N.Budnev (ISU), C.Francile, F. Podesta, R.Podesta, E. Gonzalez (Observatorio Astronomico Felix Aguilar (OAFA), A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory), A. Gabovich, V.Yurkov (Blagoveschensk Educational StateUniversity) D.Buckley (SAAO), R.Rebolo (The Instituto de Astrofisica de Canarias), L.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez, A.R.Corella, L.H.Rodriguez (INAOE, Guillermo Haro Astrophysics Observatory) 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 241209E ( Fermi GBM team, GCN 38495) errorbox 142 sec after notice time and 177 sec after trigger time at 2024-12-09 18:29:40 UT, with upper limit up to 18.6 mag. Observations started at twilight. The observations began at zenith distance = 47 deg. The sun altitude is -10.4 deg. The galactic latitude b = -37 deg., longitude l = 177 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2701531 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 207 | 2024-12-09 18:29:40 | MASTER-SAAO | (02h 58m 04.37s , +06d 32m 47.4s) | C | 60 | 17.1 | 377 | 2024-12-09 18:32:30 | MASTER-SAAO | (03h 06m 07.86s , +06d 32m 04.1s) | C | 60 | 17.5 | 456 | 2024-12-09 18:33:49 | MASTER-SAAO | (03h 27m 25.63s , +02d 44m 45.4s) | C | 60 | 17.3 | 630 | 2024-12-09 18:36:43 | MASTER-SAAO | (03h 35m 23.18s , +02d 45m 36.0s) | C | 60 | 17.3 | 1039 | 2024-12-09 18:43:32 | MASTER-SAAO | (02h 58m 01.92s , +06d 33m 34.6s) | C | 60 | 17.8 | 1209 | 2024-12-09 18:46:22 | MASTER-SAAO | (03h 06m 08.99s , +06d 33m 54.4s) | C | 60 | 18.0 | 1288 | 2024-12-09 18:47:41 | MASTER-SAAO | (03h 27m 23.42s , +02d 45m 32.4s) | C | 60 | 17.6 | 1460 | 2024-12-09 18:50:34 | MASTER-SAAO | (03h 35m 29.15s , +02d 45m 45.1s) | C | 60 | 17.6 | 1870 | 2024-12-09 18:57:23 | MASTER-SAAO | (02h 58m 05.67s , +06d 34m 07.4s) | C | 60 | 18.2 | 2039 | 2024-12-09 19:00:12 | MASTER-SAAO | (03h 06m 01.95s , +06d 34m 27.1s) | C | 60 | 18.4 | 2119 | 2024-12-09 19:01:33 | MASTER-SAAO | (03h 27m 28.41s , +02d 45m 48.1s) | C | 60 | 18.4 | 2292 | 2024-12-09 19:04:25 | MASTER-SAAO | (03h 35m 29.42s , +02d 45m 08.6s) | 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/38496. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 36494] GRB 241209E: Fermi GBM Final Real-time Localization
by GCN Circulars 09 Dec '24

09 Dec '24

TITLE: GCN CIRCULAR NUMBER: 38495 SUBJECT: GRB 241209E: Fermi GBM Final Real-time Localization DATE: 24/12/09 18:37:23 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 LONG GRB At 18:26:43 UT on 9 Dec 2024, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 241209E (trigger 755461608.700102 / 241209769). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 53.1, Dec = 7.6 (J2000 degrees, equivalent to J2000 03h 32m, 7d 35'), with a statistical uncertainty of 9.8 degrees. The angle from the Fermi LAT boresight is 57.0 degrees. The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn241209769/… The HEALPix FITS file, including the estimated localization systematic, can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn241209769/… The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn241209769/… View this GCN Circular online at https://gcn.nasa.gov/circulars/38495. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 36493] GRB 241209B: Swift ToO observations
by GCN Circulars 09 Dec '24

09 Dec '24

TITLE: GCN CIRCULAR NUMBER: 38494 SUBJECT: GRB 241209B: Swift ToO observations DATE: 24/12/09 17:59:12 GMT FROM: Phil Evans at U of Leicester <pae9(a)star.le.ac.uk> P. A. Evans (U. Leicester) reports on behalf of the Swift team: Swift has initiated a ToO observation of the SVOM/ECLAIRs GRB 241209B. Automated analysis of the XRT data will be presented online at https://www.swift.ac.uk/ToO_GRBs/00021739 Any uncatalogued X-ray sources detected in this analysis will be reported on this website and via GCN COUNTERPART notices. These are not necessarily related to the SVOM/ECLAIRs event. Any X-ray source considered to be a probable afterglow candidate will be reported via a GCN Circular after manual consideration. Details of the XRT automated analysis methods are detailed in Evans et al. (2007, A&A, 469, 379; 2009, MNRAS, 397, 1177 and 2014, ApJS, 210, 8). This circular is an official product of the Swift-XRT team. View this GCN Circular online at https://gcn.nasa.gov/circulars/38494. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 36492] LIGO/Virgo/KAGRA S241102br: continued GRAWITA observations and detection of an optical transient (AT2024adip)
by GCN Circulars 09 Dec '24

09 Dec '24

TITLE: GCN CIRCULAR NUMBER: 38493 SUBJECT: LIGO/Virgo/KAGRA S241102br: continued GRAWITA observations and detection of an optical transient (AT2024adip) DATE: 24/12/09 17:09:59 GMT FROM: Andrea Reguitti at INAF - Osservatorio Astronomico di Brera <andreareguitti(a)gmail.com> A. Reguitti (INAF-OAB / INAF-OAPd), P. D’Avanzo (INAF-OAB), A. Rossi (INAF-OAS), L. Izzo (INAF-OACn / DARK), S. Benetti (INAF-OAPd), R. Brivio (INAF-OAB), S. Campana (INAF-OAB), V. D'Elia (ASI), M. Ferro (INAF-OAB), Y.-D. Hu (INAF-OAB), A. Melandri (INAF-OAR), F. Ragosta (Univ. Napoli / INAF-OACn) et al. on behalf of the GRAWITA collaboration We continued to carry out optical follow-up observations of the well-localized LIGO/Virgo/KAGRA GW trigger S241102br (LVK Collaboration, GCN Circ. #38043). Targeted observations carried out with the LBC camera mounted on LBT (Mt. Graham, AZ, USA) on 2024-11-09 at midtime 03:24 UT (~6.4 days after the GW trigger) with the Sloan-r and Sloan-z filters revealed the presence of a bright source located at coordinates RA, Dec = 23:01:50.45, +38:41:39.7" (+/- 0.3") not visible in archival Pan-STARRS images. This source lies on the plane of a bright galaxy seen edge-on, with an offset of about 5" from the host galaxy centre. From preliminary photometry we estimate for this source r=21.2+/-0.2 (AB mag, calibrated against the Pan-STARRS catalogue), confirmed by the subtraction of the template images from the PanSTARRS all-sky survey. Therefore, within the Pan-STARRS limits, suggesting this is a new transient. Re-inspection of the Asiago Schmidt telescope images (Reguitti et al. 2024, GCN #38417), which includes subtraction of the template images from the PanSTARRS all-sky survey, revealed a possible, low SNR detection of the same source already on 2024-11-02, at r=20.9+/-0.4 AB mag. Finally, observations carried out with the DOLORES camera mounted on TNG (Roque de los Muchachos, La Palma, Spain) on 2024-12-02 (~ 30 days after the GW trigger) in imaging mode with the Sloan r-band filter revealed the source has clearly faded below the detection threshold at r>22.0 AB mag, which entails a fading of at least 0.8 mag. On the same night we performed also TNG/DOLORES spectroscopy with the LR-B grism: from the narrow Halpha emission of the host galaxy we derive a redshift z = 0.0815, corresponding to a luminosity distance DL = 373 Mpc (assuming H0=69.6, Wm=0.286, WΛ=0.714), consistent with the distance reported for the GW event S241102br. Adopting the aforementioned luminosity distance, at the time of LBT observation the source had an absolute magnitude of Mr=-17.0+/-0.2, corrected for the Galactic extinction (Ar=0.38 mag, Schlafly & Finkbeiner 2011). This new transient source has been loaded into the Transient Name Server with the official IAU name AT 2024adip. Further observations and analysis of AT 2024adip is in progress. We thank the staff at LBT Observatory and TNG telescope for their excellent support, in particular the TNG observers Massimo Cecconi, Filippo Ambrosino, Giovanni Mainella, the LBTO staff Alexander Backer, Steve Allanson, and for LBT-Italy Felice Cusano, Ester Marini. View this GCN Circular online at https://gcn.nasa.gov/circulars/38493. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 36491] GRB 241209A: REM optical/NIR observations
by GCN Circulars 09 Dec '24

09 Dec '24

TITLE: GCN CIRCULAR NUMBER: 38492 SUBJECT: GRB 241209A: REM optical/NIR observations DATE: 24/12/09 16:46:39 GMT FROM: Riccardo Brivio at INAF-OAB <riccardo.brivio(a)inaf.it> R.Brivio, M. Ferro, P. D’Avanzo, S. Covino, Y.-D. Hu, D. Fugazza (INAF-OAB) report on behalf of the REM team: We observed the field of GRB 241209A detected by Swift/BAT (Parsotan et al., GCN 38476) and Fermi/GBM (Fermi GBM team, GCN 38474) with the REM 60cm robotic telescope located at the ESO observatory of La Silla (Chile). The observations were carried in the g, r, i, z, J, H, K bands, starting on 2024 December 09 at 05:40:01 UT (i.e. 4.3 minutes after the Swift trigger), and lasting for about 2 hours. From preliminary photometry we do not detect any clear counterpart in the optical and NIR images at the Swift-XRT refined position (Evans et al., GCN 38486) down to the following 3sigma magnitude upper limits: r > 19.5 (AB; calibrated against the PanSTARRS catalogue) at a mid-time of t - t0 = 67.13 minutes after the trigger, J > 18.0 H > 16.1 (Vega; calibrated against the 2MASS catalogue) at a mid-time of t - t0 = 42.1 and 29.8 minutes after the trigger, respectively. View this GCN Circular online at https://gcn.nasa.gov/circulars/38492. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 36490] GRB 241209D: Enhanced Swift-XRT position
by GCN Circulars 09 Dec '24

09 Dec '24

TITLE: GCN CIRCULAR NUMBER: 38491 SUBJECT: GRB 241209D: Enhanced Swift-XRT position DATE: 24/12/09 14:11:43 GMT FROM: Phil Evans at U of Leicester <pae9(a)star.le.ac.uk> M.R. Goad, J.P. Osborne, A.P. Beardmore and P.A. Evans (U. Leicester) report on behalf of the Swift-XRT team. Using 1140 s of XRT Photon Counting mode data and 4 UVOT images for GRB 241209D, 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 = 190.11190, -2.89162 which is equivalent to: RA (J2000): 12h 40m 26.86s Dec (J2000): -02d 53' 29.8" with an uncertainty of 2.8 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. View this GCN Circular online at https://gcn.nasa.gov/circulars/38491. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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[vsnet-grb-info 36489] GRB 241209C: AstroSat CZTI detection
by GCN Circulars 09 Dec '24

09 Dec '24

TITLE: GCN CIRCULAR NUMBER: 38490 SUBJECT: GRB 241209C: AstroSat CZTI detection DATE: 24/12/09 12:29:50 GMT FROM: Gaurav Waratkar at IIT Bombay <gauravwaratkar(a)iitb.ac.in> J. Joshi (IUCAA), G. Waratkar (IITB), 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 241209C which was also detected by Fermi/GBM (Fermi-GBM Team, GCN Circ. 38482). The source was clearly detected in the CsI anticoincidence (Veto) detector in the 100-500 keV energy range. The light curve peaks at 2024-12-09 07:22:58.21 UTC. The measured peak count rate associated with the burst is 255 (+79, -35) counts/s above the background in the combined data of all quadrants, with a total of 1341 (+212, -365) counts. The local mean background count rate was 1635 (+16, -10) counts/s. We measure a T90 of 6.6 (+0.5, -0.9) 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/38490. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0L…

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