GRB250327A

This page lists all entries on GRB250327A in GRBweb

Summary Fermi GBM Swift GCN 39876 GCN 39877 GCN 39879 GCN 39880 GCN 39881 GCN 39882 GCN 39884 GCN 39885 GCN 39892 GCN 39899 GCN 39987

Summary table
Variable Value Source
GRB_name_Fermi GRB250327313
T0 7:30:04 UTC GCN_circulars,Swift Det
ra 248.1950° Swift
decl 61.6164° Swift
pos_error 4.66e-04° Swift
T90 161.283 s Fermi_GBM
T90_error 8.464 s Fermi_GBM
T90_start 7:30:07.606 UTC Fermi_GBM
fluence 1.68e-05 erg/cm² Fermi_GBM
fluence_error 8.04e-08 erg/cm² Fermi_GBM
T100 164.889 s
GBM_located False
mjd 60761.3125462963 GCN_circulars,Swift Det
Fermi GBM table
GRB_name_Fermi GRB250327313
trigger_name bn250327313
ra 248.1971°
decl 61.5950°
pos_error 3.32e+00°
datum 2025-03-27
t_trigger 7:30:06.326 UTC
T90 161.283 s
T90_error 8.464 s
T90_start 7:30:07.606 UTC
fluence 1.68e-05 erg/cm²
fluence_error 8.04e-08 erg/cm²
flux_1024 5.08e+00 erg/cm²/s
flux_1024_error 2.34e-01 erg/cm²/s
flux_1024_time 7.04e-01 erg/cm²/s
flux_64 7.02e+00 erg/cm²/s
flux_64_error 1.03e+00 erg/cm²/s
Swift table
GRB_name GRB250327A
t_trigger 7:30:04 UTC
ra 248.1950°
decl 61.6164°
pos_error 4.66e-04°
GCN 39876 table
GRB_name GRB250327A
GCN_number 39876
Detection_method Fermi GBM final loc
t_trigger 7:30:06 UTC
ra 246.1000°
decl 62.3000°
Circular_text TITLE: GCN CIRCULAR NUMBER: 39876 SUBJECT: GRB 250327A: Fermi GBM Final Real-time Localization DATE: 25/03/27 07:40:37 GMT FROM: Fermi GBM Team at MSFC/Fermi-GBM The Fermi GBM team reports the detection of a likely LONG GRB At 07:30:06 UT on 27 Mar 2025, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 250327A (trigger 764753411.32631 / 250327313). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 246.1, Dec = 62.3 (J2000 degrees, equivalent to J2000 16h 24m, 62d 17'), with a statistical uncertainty of 3.6 degrees. The angle from the Fermi LAT boresight is 47.0 degrees. The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250327313/quicklook/glg_skymap_all_bn250327313.png The HEALPix FITS file, including the estimated localization systematic, can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250327313/quicklook/glg_healpix_all_bn250327313.fit The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2025/bn250327313/quicklook/glg_lc_medres34_bn250327313.gif
GCN 39877 table
GRB_name GRB250327A
GCN_number 39877
Detection_method Swift Det
t_trigger 7:30:04 UTC
ra 248.1970°
decl 61.5950°
Circular_text TITLE: GCN CIRCULAR NUMBER: 39877 SUBJECT: GRB 250327A: Swift detection of a burst DATE: 25/03/27 08:11:09 GMT FROM: Jamie Kennea at Penn State T. M. Parsotan (GSFC), J. J. DeLaunay (PSU), R. Gupta (NASA GSFC), J. A. Kennea (PSU) and K. L. Page (U Leicester) report on behalf of the Neil Gehrels Swift Observatory Team: At 07:30:04 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 250327A (trigger=1299088). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 248.197, +61.595 which is RA(J2000) = 16h 32m 47s Dec(J2000) = +61d 35' 43" 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 40 sec. The peak count rate was ~1648 counts/sec (15-350 keV), at ~3 sec after the trigger. Due to an observing constraint, Swift did not get data immediately. We will report on XRT data in a later GCN. Burst Advocate for this burst is T. M. Parsotan (tyler.parsotan 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/)
GCN 39879 table
GRB_name GRB250327A
GCN_number 39879
Detection_method Swift-BAT Det
Circular_text TITLE: GCN CIRCULAR NUMBER: 39879 SUBJECT: GRB 250327A: DDOTI Optical Observations DATE: 25/03/27 13:00:18 GMT FROM: Rosa L. Becerra at Tor Vergata, Roma Rosa L. Becerra (U Roma), Alan M. Watson (UNAM), Camila Angulo Valdez (UNAM), Sahil Atri (U Roma), Nat Butler (ASU), Simone Dichiara (Penn State University), Tsvetelina Dimitrova (ASU), Alexander Kutyrev (GSFC/UMD), William H. Lee (UNAM), and Océlotl López (UNAM), Margarita Pereyra (UNAM) and Eleonora Troja (U Roma) report: We observed the field of the Swift/BAT GRB 250327A (Parsotan et al., GCN 39877) also detected by Fermi/GBM (Fermi GBM Team, GCN 39876) with the DDOTI/OAN wide-field imager at the Observatorio Astronómico Nacional on the Sierra of San Pedro Martir (http://ddoti.astroscu.unam.mx) on the night of 2025-03-27 UTC. DDOTI observed the Swift/BAT error region (Parsotan et al., GCN 39877) from 08:13 UTC to 10:43 UTC (from T+0.7 h to T+3.2 h after the trigger) with a total exposure of 1.4 hours. Comparing our observations to the USNO-B1 and PanSTARRS PS1 DR2 catalogues and after performed image subtraction against PanSTARRS PS1 DR2, we detect no evident uncatalogued sources within the observed field to a 5-sigma limiting AB magnitude of w > 21.82 This non-detection is consistent with the reported by Ducoin et al. (GCN 39877). We thank the staff of the Observatorio Astronómico Nacional on the Sierra of San Pedro Mártir.
GCN 39880 table
GRB_name GRB250327A
GCN_number 39880
Detection_method Swift Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 39880 SUBJECT: Swift GRB 250327A: Global MASTER-Net observations report DATE: 25/03/27 13:57:44 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs 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 250327A ( T. M. Parsotan et al., GCN 39877) errorbox 22478 sec after notice time and 22599 sec after trigger time at 2025-03-27 13:46:44 UT, with upper limit up to 19.1 mag. The observations began at zenith distance = 56 deg. The sun altitude is -20.9 deg. The galactic latitude b = 40 deg., longitude l = 92 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2825096 We obtain a following upper limits. Tmid-T0 | Site |Filt.| Expt. | Limit| Comment _________|_____________________|_____|_______|______|________ 22690 | MASTER-Tunka | C | 180 | 19.1 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited.
GCN 39881 table
GRB_name GRB250327A
GCN_number 39881
Detection_method Fermi GBM Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 39881 SUBJECT: Fermi GRB 250327A: Global MASTER-Net observations report DATE: 25/03/27 14:01:03 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs 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) started inspect of the Fermi GRB 250327A ( Fermi GBM team, GCN 39876) errorbox 22555 sec after notice time and 22597 sec after trigger time at 2025-03-27 13:46:44 UT, with upper limit up to 19.1 mag. The observations began at zenith distance = 56 deg. The sun altitude is -20.9 deg. The galactic latitude b = 41 deg., longitude l = 93 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2825101 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 22688 | 2025-03-27 13:46:44 | MASTER-Tunka | (16h 33m 04.03s , +61d 29m 19.4s) | C | 180 | 19.1 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited.
GCN 39882 table
GRB_name GRB250327A
GCN_number 39882
Detection_method Fermi GBM Det
t_trigger 7:30:06.330 UTC
Circular_text TITLE: GCN CIRCULAR NUMBER: 39882 SUBJECT: GRB 250327A: Fermi GBM observation DATE: 25/03/27 14:52:00 GMT FROM: Andreas von Kienlin at MPE A. von Kienlin (MPE) reports on behalf of the Fermi GBM Team: "At 07:30:06.33 UT on 27 March 2025, the Fermi Gamma-Ray Burst Monitor (GBM) triggered and located GRB 250327A (trigger 764753411 / 250327313), which was also detected by the Swift/BAT (Parsotan et al. 2025, GCN 39877). The Fermi GBM Final Real-time Localization (GCN 39876) is consistent with the Swift position. The angle from the Fermi LAT boresight at the GBM trigger time is 47 degrees. The GBM light curve shows a structured emission episode with a duration (T90) of about 160 s (50-300 keV). The time-averaged spectrum from T0-1.024s to T0+90.114s is best fit by a Band function with Epeak = 480 +/- 50 keV, alpha = -1.08 +/- 0.03, and beta = -2.14 +/- 0.15. The event fluence (10-1000 keV) in this time interval is (2.97 +/- 0.07)E-05 erg/cm^2. The 1.024-sec peak photon flux measured starting from T0+0.704 s in the 10-1000 keV band is 5.08 +/- 0.23 ph/s/cm^2. The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog: https://heasarc.gsfc.nasa.gov/W3Browse/fermi/fermigbrst.html For Fermi GBM data and info, please visit the official Fermi GBM Support Page: https://fermi.gsfc.nasa.gov/ssc/data/access/gbm/"
GCN 39884 table
GRB_name GRB250327A
GCN_number 39884
Detection_method Optical
ra 248.1800°
decl 61.6335°
Circular_text TITLE: GCN CIRCULAR NUMBER: 39884 SUBJECT: GRB 250327A: SVOM/VT optical candidate DATE: 25/03/27 16:42:22 GMT FROM: SVOM_group L.P. Xin (NAOC), J. T. Palmerio (CEA), L. Zhang (IHEP), Y.D. Hu (GXU), X.L. Chen (YNU), Y. L. Qiu, H.L. Li., C. Wu, Z.H. Yao, Y.N. Ma, X.H. Han, H.B. Cai, J.Y. Wei (NAOC), B. Cordier (CEA), report on behalf of the SVOM/VT team: SVOM performed a Target of Opportunity observation of GRB 250327A (Fermi GBM team, GCN 39876; Parsotan et al., GCN 39877). SVOM/VT began observing the field at 2025-03-27T11:25:40.50 UT, ~3.9 hours after the Swift/BAT trigger, in the VT_B (400nm-650nm) and VT_R (650nm-1000nm) channels simultaneously. An uncatalogued candidate is detected inside the Swift/BAT error circle at ra=248.18018, dec=61.63347 (J2000), corresponding to: RA (J2000) = 16:32:43.2 Dec (J2000) = +61:38:00.5 with an uncertainty of 1.0 arcsec. This source is not present in the archival Legacy Survey. The source is detected in the VT_R stacked image with exposure time of 47x60 seconds with VT_R = 22.8 +/- 0.3 mag (AB). The 3 sigma upper limit in the VT_B is 23.4 mag (AB). We thank D.B. Malesani for helpful discussion. The Space Variable Objects Monitor (SVOM) is a China-France joint mission led by the Chinese National Space Administration (CNSA, China), National Center for Space Studies (CNES, France) and the Chinese Academy of Sciences (CAS, China), which is dedicated to observing gamma-ray bursts and other transient phenomena in the energetic universe. VT was jointly developed by Xi'an Institute of Optics and Precision Mechanics (XIOPM), CAS and National astronomical observatories (NAOC),CAS.
GCN 39885 table
GRB_name GRB250327A
GCN_number 39885
Detection_method Swift-BAT Det
Circular_text TITLE: GCN CIRCULAR NUMBER: 39885 SUBJECT: GRB 250327A: J-band observations with WINTER DATE: 25/03/27 19:40:58 GMT FROM: Geoffrey Mo at MIT Geoffrey Mo (MIT), Benjamin Schneider (LAM), Tomas Ahumada (Caltech), Danielle Frostig (CfA), Viraj Karambelkar (Caltech), Robert Stein (UMD), Nathan Lourie (MIT), Robert Simcoe (MIT), and Mansi Kasliwal (Caltech) report: We observed the field of GRB 250327A (Fermi GBM Team, GCN 39876; Parsotan et al., GCN 39877, Kienlin et al., GCN 39882) in the near-infrared J-band with the Palomar 1-m telescope, equipped with the 1-square degree WINTER camera (Lourie et al. 2020, Frostig et al. 2024). Observations were triggered automatically and began at 2025-03-27T07:41:48 UTC (12 min after the GRB), consisting of 5 x 120 s exposures. The images were processed using the WINTER data reduction pipeline implemented with mirar (https://github.com/winter-telescope/mirar, https://doi.org/10.5281/zenodo.13352565). We do not detect a source at the SVOM/VT counterpart location (Xin et al., GCN 39884), and also do not detect any new sources in the Swift/BAT localization after visual comparison to archival PanSTARRS-1 (Chambers et al. 2016) y-band imaging. This is consistent with other observations (Ducoin et al., GCN 39878; Becerra et al., GCN 39879; Lipunov et al., GCN 39880; Lipunov et al., GCN 39881). We obtain the following 5-sigma upper limit: J ~ 18.3 mag (AB). WINTER (Wide-field INfrared Transient ExploreR) is a partnership between MIT and Caltech, housed at Palomar Observatory, and funded by NSF MRI, NSF AAG, the David and Lucile Packard Foundation, and the MIT Kavli Institute for Astrophysics and Space Research.
GCN 39892 table
GRB_name GRB250327A
GCN_number 39892
Detection_method Swift-XRT Other
ra 248.1950°
decl 61.6164°
Circular_text TITLE: GCN CIRCULAR NUMBER: 39892 SUBJECT: GRB 250327A: Swift-XRT refined Analysis DATE: 25/03/28 00:07:39 GMT FROM: Phil Evans at U of Leicester D.N. Burrows (PSU), M. A. Williams (PSU), S. Dichiara (PSU), J.P. Osborne (U. Leicester), K.L. Page (U. Leicester), V. D'Elia (SSDC & INAF-OAR), B. Sbarufatti (INAF-OAB), C. Salvaggio (INAF-OAB) and P.A. Evans report on behalf of the Swift-XRT team: We have analysed 8.0 ks of XRT data for GRB 250327A, from 12.1 ks to 47.5 ks after the BAT trigger. The data are entirely in Photon Counting (PC) mode. The refined XRT position is RA, Dec = 248.1950, +61.6164 which is equivalent to: RA (J2000): 16 32 46.80 Dec(J2000): +61 36 58.9 with an uncertainty of 3.6 arcsec (radius, 90% confidence). The light curve can be modelled with a power-law decay with a decay index of alpha=0.92 (+0.22, -0.21). A spectrum formed from the PC mode data can be fitted with an absorbed power-law with a photon spectral index of 2.38 (+0.32, -0.29). The best-fitting absorption column is 3.0 (+1.1, -1.0) x 10^21 cm^-2, in excess of the Galactic value of 2.6 x 10^20 cm^-2 (Willingale et al. 2013). The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 3.1 x 10^-11 (5.7 x 10^-11) erg cm^-2 count^-1. A summary of the PC-mode spectrum is thus: Total column: 3.0 (+1.1, -1.0) x 10^21 cm^-2 Galactic foreground: 2.6 x 10^20 cm^-2 Excess significance: 4.6 sigma Photon index: 2.38 (+0.32, -0.29) If the light curve continues to decay with a power-law decay index of 0.92, the count rate at T+24 hours will be 0.016 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 5.1 x 10^-13 (9.3 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/01299088. This circular is an official product of the Swift-XRT team.
GCN 39899 table
GRB_name GRB250327A
GCN_number 39899
Detection_method Swift-BAT Det
Circular_text TITLE: GCN CIRCULAR NUMBER: 39899 SUBJECT: GRB 250327A: SVOM/VT upper limits on the XRT position DATE: 25/03/28 06:44:48 GMT FROM: SVOM_group H.L. Li(NAOC), L. Zhang (IHEP), Y.D. Hu (GXU), X.L. Chen (YNU), Y. L. Qiu, L.P. Xin, C. Wu, Z.H. Yao, Y. Xu, P.P. Zhang, J. Wang, Y.N. Ma, X.H. Han, H.B. Cai, W. J. Xie, J.Y. Wei (NAOC), J. T. Palmerio (CEA)report on behalf of the SVOM/VT team: SVOM performed a Target of Opportunity observation of GRB 250327A (Fermi GBM team, GCN 39876; Parsotan et al., GCN 39877). SVOM/VT began observing the field at 2025-03-27T11:25:40.50 UT, ~3.9 hours after the Swift/BAT trigger, in the VT_B (400nm-650nm) and VT_R (650nm-1000nm) channels simultaneously. With the full X-band data, no any source was detected in the stacked images within the errorbox of Swift/XRT (Burrows et al. GCNC39892). The 3 sigma limits in AB magnitude were derived as follows: --------------------------------------------------------- (t-T0)_mid(hr) exptime(ks) Band upperlim (3sigma) 5.9 7.32 VT_R 23.8 5.9 7.38 VT_B 23.8 Deeper or redder observations are encouraged to investigate the nature of the burst. The Space Variable Objects Monitor (SVOM) is a China-France joint mission led by the Chinese National Space Administration (CNSA, China), National Center for Space Studies (CNES, France) and the Chinese Academy of Sciences (CAS, China), which is dedicated to observing gamma-ray bursts and other transient phenomena in the energetic universe. VT was jointly developed by Xi'an Institute of Optics and Precision Mechanics (XIOPM), CAS and National astronomical observatories (NAOC),CAS.
GCN 39987 table
GRB_name GRB250327A
GCN_number 39987
Detection_method Swift-BAT Det
ra 248.2090°
decl 61.6100°
Circular_text TITLE: GCN CIRCULAR NUMBER: 39987 SUBJECT: GRB 250327A Swift-BAT refined analysis DATE: 25/03/31 21:38:12 GMT FROM: Mike Moss at NASA GSFC S. D. Barthelmy (GSFC), R. Gupta (GSFC), H. A. Krimm (NSF), S. Laha (GSFC/UMBC), A. Y. Lien (U Tampa), C. B. Markwardt (GSFC), M. J. Moss (GSFC), D. M. Palmer (LANL), T. Parsotan (GSFC), D. Sadaula (GSFC/UMBC), T. Sakamoto (AGU) (i.e. the Swift-BAT team): Using the data set from T-239 to T+843 sec from the recent telemetry downlink, we report further analysis of BAT GRB 250327A (trigger #1299088) (Parsotan, et al., GCN Circ. 39877). The BAT ground-calculated position is RA, Dec = 248.209, 61.610 deg which is RA(J2000) = 16h 32m 50.1s Dec(J2000) = +61d 36' 35.4" with an uncertainty of 2.2 arcmin, (radius, sys+stat, 90% containment). The partial coding was 10%. The mask-weighted light curve shows a single main pulse lasting ~60 sec composed of several shorter pulses. The remainder of the burst emission is included in a dim tail. The T90 (15-350 keV) is 91.008 +- 12.21 sec (estimated error including systematics). The time-averaged spectrum from T+1.67 to T+109.928 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.28 +- 0.12. The fluence in the 15-150 keV band is 7.6 +- 0.5 x 10^-06 erg/cm2. The 1-sec peak photon flux measured from T+24.49 sec in the 15-150 keV band is 2.1 +- 0.7 ph/cm2/sec. All the quoted errors are at the 90% confidence level. The results of the batgrbproduct analysis are available at https://swift.gsfc.nasa.gov/results/batgrbcat/BAT_refined_circular/1299088