GRB200325B

This page lists all entries on GRB200325B in GRBweb

Summary Fermi GBM IPN GCN 27441 GCN 27442 GCN 27446 GCN 27450 GCN 27452 GCN 27455 GCN 27456 GCN 27457 GCN 27460 GCN 27464 GCN 27465 GCN 27467 GCN 27468 GCN 27471 GCN 27473 GCN 27481

Summary table
Variable Value Source
GRB_name_Fermi GRB200325620
T0 14:53:13.733 UTC Fermi_GBM
ra 31.7208° IPN
decl -31.8167° IPN
pos_error 3.30e+00° IPN
T90 36.609 s Fermi_GBM
T90_error 0.923 s Fermi_GBM
T90_start 14:53:13.733 UTC Fermi_GBM
fluence 9.54e-06 erg/cm² Fermi_GBM
fluence_error 2.97e-08 erg/cm² Fermi_GBM
T100 36.609 s
GBM_located False
mjd 58933.620297835645 Fermi_GBM
Fermi GBM table
GRB_name_Fermi GRB200325620
trigger_name bn200325620
ra 167.5542°
decl 27.8197°
pos_error 3.71e+00°
datum 2020-03-25
t_trigger 14:53:16.037 UTC
T90 36.609 s
T90_error 0.923 s
T90_start 14:53:13.733 UTC
fluence 9.54e-06 erg/cm²
fluence_error 2.97e-08 erg/cm²
flux_1024 9.14e+00 erg/cm²/s
flux_1024_error 3.53e-01 erg/cm²/s
flux_1024_time 1.07e+01 erg/cm²/s
flux_64 1.35e+01 erg/cm²/s
flux_64_error 1.58e+00 erg/cm²/s
IPN table
GRB_name GRB200325B
ra 31.7208°
decl -31.8167°
pos_error 3.30e+00°
GCN 27441 table
GRB_name GRB200325B
GCN_number 27441
Detection_method Fermi GBM final loc
t_trigger 14:53:16 UTC
ra 166.9000°
decl 26.2000°
Circular_text TITLE: GCN CIRCULAR NUMBER: 27441 SUBJECT: GRB 200325B: Fermi GBM Final Real-time Localization DATE: 20/03/25 15:03:33 GMT FROM: Fermi GBM Team at MSFC/Fermi-GBM The Fermi GBM team reports the detection of a likely LONG GRB At 14:53:16 UT on 25 Mar 2020, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 200325B (trigger 606840801.036936 / 200325620). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 166.9, Dec = 26.2 (J2000 degrees, equivalent to J2000 11h 07m, 26d 11'), with a statistical uncertainty of 3.3 degrees. The angle from the Fermi LAT boresight is 101.0 degrees. The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200325620/quicklook/glg_skymap_all_bn200325620.png The HEALPix FITS file, including the estimated localization systematic, can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200325620/quicklook/glg_healpix_all_bn200325620.fit The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2020/bn200325620/quicklook/glg_lc_medres34_bn200325620.gif
GCN 27442 table
GRB_name GRB200325B
GCN_number 27442
Detection_method Fermi GBM Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 27442 SUBJECT: Fermi trigger No 606840801: Global MASTER-Net observations report DATE: 20/03/25 19:45:36 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs V. Lipunov, E. Gorbovskoy, V.Kornilov, N.Tyurina, P.Balanutsa, A.Kuznetsov, F.Balakin, V.Vladimirov, D. Vlasenko, I.Gorbunov, D.Zimnukhov, V.Senik, T.Pogrosheva, D.Kuvshinov, D. Cheryasov (Lomonosov Moscow State University, SAI, Physics Department), R. Podesta, C.Lopez, F. Podesta, C.Francile (Observatorio Astronomico Felix Aguilar OAFA), H.Levato (Instituto de Ciencias Astronomicas, de la Tierra y del Espacio ICATE), R. Rebolo, M. Serra (The Instituto de Astrofisica de Canarias), D. Buckley (South African Astronomical Observatory), O.A. Gres, N.M. Budnev, O.Ershova (Irkutsk State University, API), A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory), V. Yurkov, A. Gabovich, Yu. Sergienko (Blagoveschensk Educational State University) 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 200325B ( Fermi GBM team, GCN 27441) errorbox 101 sec after notice time and 129 sec after trigger time at 2020-03-25 14:55:25 UT, with upper limit up to 18.5 mag. The observations began at zenith distance = 25 deg. The sun altitude is -29.4 deg. MASTER-Kislovodsk robotic telescope located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) started inspect of the Fermi GRB 200325B errorbox 101 sec after notice time and 5198 sec after trigger time at 2020-03-25 16:19:54 UT, with upper limit up to 18.1 mag. Observations started at twilight. The observations began at zenith distance = 48 deg. The sun altitude is -10.0 deg. MASTER-Tavrida robotic telescope located in Russia (Lomonosov MSU, SAI Crimea astronomical station) started inspect of the Fermi GRB 200325B errorbox 101 sec after notice time and 7545 sec after trigger time at 2020-03-25 16:59:01 UT, with upper limit up to 17.2 mag. Observations started at twilight. The observations began at zenith distance = 46 deg. The sun altitude is -11.1 deg. MASTER-SAAO robotic telescope located in South Africa (South African Astronomical Observatory) started inspect of the Fermi GRB 200325B errorbox 101 sec after notice time and 11810 sec after trigger time at 2020-03-25 18:10:06 UT, with upper limit up to 16.1 mag. The observations began at zenith distance = 75 deg. The sun altitude is -19.1 deg. The galactic latitude b = 70 deg., longitude l = 205 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=1321597 We obtain a following upper limits. Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment _________|_____________________|_____________________|____________________________________|_____|_______|_______|________ 145 | 2020-03-25 14:55:25 | MASTER-Tunka | (11h 16m 38.82s , +30d 17m 40.1s) | P| | 30 | 17.1 | 194 | 2020-03-25 14:56:15 | MASTER-Tunka | (11h 16m 35.54s , +30d 19m 13.0s) | P| | 30 | 17.2 | 249 | 2020-03-25 14:57:04 | MASTER-Tunka | (11h 16m 35.52s , +30d 17m 42.4s) | P| | 40 | 17.1 | 313 | 2020-03-25 14:58:04 | MASTER-Tunka | (11h 16m 39.10s , +30d 19m 15.7s) | P| | 50 | 17.5 | 393 | 2020-03-25 14:59:13 | MASTER-Tunka | (11h 16m 33.29s , +30d 18m 25.1s) | P| | 70 | 17.9 | 643 | 2020-03-25 15:02:59 | MASTER-Tunka | (11h 08m 06.42s , +26d 38m 13.4s) | P| | 120 | 18.2 | 792 | 2020-03-25 15:05:18 | MASTER-Tunka | (11h 08m 12.76s , +26d 37m 16.6s) | P| | 140 | 18.5 | 5228 | 2020-03-25 16:19:54 | MASTER-Kislovodsk | (11h 18m 11.30s , +30d 09m 55.5s) | C | 60 | 17.1 | 5228 | 2020-03-25 16:19:54 | MASTER-Kislovodsk | (11h 27m 41.11s , +29d 42m 01.1s) | C | 60 | 17.5 | 5309 | 2020-03-25 16:21:15 | MASTER-Kislovodsk | (11h 05m 15.52s , +28d 09m 12.6s) | C | 60 | 17.4 | 5309 | 2020-03-25 16:21:15 | MASTER-Kislovodsk | (11h 14m 34.63s , +27d 41m 21.4s) | C | 60 | 17.6 | 5390 | 2020-03-25 16:22:35 | MASTER-Kislovodsk | (11h 13m 45.48s , +32d 07m 57.3s) | C | 60 | 17.5 | 5390 | 2020-03-25 16:22:35 | MASTER-Kislovodsk | (11h 23m 26.74s , +31d 40m 04.0s) | C | 60 | 17.7 | 5470 | 2020-03-25 16:23:56 | MASTER-Kislovodsk | (10h 59m 49.50s , +30d 08m 33.1s) | C | 60 | 17.8 | 5470 | 2020-03-25 16:23:56 | MASTER-Kislovodsk | (11h 09m 19.34s , +29d 40m 43.5s) | C | 60 | 17.9 | 5551 | 2020-03-25 16:25:16 | MASTER-Kislovodsk | (11h 18m 16.68s , +30d 09m 33.0s) | C | 60 | 17.6 | 5551 | 2020-03-25 16:25:16 | MASTER-Kislovodsk | (11h 27m 44.96s , +29d 41m 36.3s) | C | 60 | 17.9 | 5631 | 2020-03-25 16:26:36 | MASTER-Kislovodsk | (11h 05m 14.16s , +28d 08m 24.5s) | C | 60 | 17.7 | 5631 | 2020-03-25 16:26:36 | MASTER-Kislovodsk | (11h 14m 32.00s , +27d 40m 31.1s) | C | 60 | 17.8 | 5711 | 2020-03-25 16:27:57 | MASTER-Kislovodsk | (11h 13m 50.96s , +32d 09m 38.0s) | C | 60 | 17.5 | 5711 | 2020-03-25 16:27:57 | MASTER-Kislovodsk | (11h 23m 31.48s , +31d 41m 42.2s) | C | 60 | 18.0 | 5792 | 2020-03-25 16:29:18 | MASTER-Kislovodsk | (10h 59m 44.77s , +30d 09m 23.4s) | C | 60 | 17.8 | 5792 | 2020-03-25 16:29:18 | MASTER-Kislovodsk | (11h 09m 14.00s , +29d 41m 32.0s) | C | 60 | 18.1 | 5872 | 2020-03-25 16:30:38 | MASTER-Kislovodsk | (11h 23m 18.78s , +28d 09m 51.7s) | C | 60 | 17.7 | 5872 | 2020-03-25 16:30:38 | MASTER-Kislovodsk | (11h 32m 35.10s , +27d 41m 53.3s) | C | 60 | 17.9 | 7576 | 2020-03-25 16:59:01 | MASTER-Tavrida | (10h 59m 11.46s , +26d 01m 29.0s) | C | 60 | 17.2 | 11841 | 2020-03-25 18:10:06 | MASTER-SAAO | (11h 01m 49.44s , +26d 06m 26.4s) | C | 60 | 12.1 | 12139 | 2020-03-25 18:15:04 | MASTER-SAAO | (11h 01m 58.23s , +26d 06m 59.4s) | C | 60 | 13.1 | 12705 | 2020-03-25 18:24:30 | MASTER-SAAO | (11h 11m 47.63s , +26d 05m 56.0s) | C | 60 | 14.4 | 12705 | 2020-03-25 18:24:30 | MASTER-SAAO | (11h 19m 56.86s , +26d 06m 42.1s) | C | 60 | 14.0 | 13076 | 2020-03-25 18:30:41 | MASTER-SAAO | (11h 11m 35.71s , +26d 07m 07.0s) | C | 60 | 15.6 | 13076 | 2020-03-25 18:30:41 | MASTER-SAAO | (11h 19m 45.03s , +26d 07m 51.9s) | C | 60 | 16.1 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited.
GCN 27446 table
GRB_name GRB200325B
GCN_number 27446
Detection_method Other
ra 167.5521°
decl 27.8202°
Circular_text TITLE: GCN CIRCULAR NUMBER: 27446 SUBJECT: GRB 200325B: MASTERt OT detection DATE: 20/03/26 12:13:10 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs V. Lipunov, E. Gorbovskoy, V.Kornilov, N.Tyurina, P.Balanutsa,A.Kuznetsov,F.Balakin, V.Vladimirov, D. Vlasenko, I.Gorbunov, D.Zimnukhov, V.Senik, T.Pogrosheva, D.Kuvshinov(Lomonosov Moscow State University, SAI, Physics Department), A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory), R. Podesta, C.Lopez, F. Podesta, C.Francile(Observatorio Astronomico Felix Aguilar OAFA), H.Levato(Instituto de Ciencias Astronomicas, de la Tierra y del Espacio ICATE), R. Rebolo, M. Serra(The Instituto de Astrofisica de Canarias), D. Buckley(South African Astronomical Observatory), O.A. Gres, N.M. Budnev, O.Ershova (Irkutsk State University, API), V. Yurkov, A. Gabovich, Yu. Sergienko(Blagoveschensk Educational State University) MASTER OT J111012.51+274912.8 discovery - new OT inside Fermi GRB 200325B (trigger 606840801) MASTER Global Robotic Net inspected GRB 200325B: Fermi trigger 606840801, Ttr=2020-03-05 14:53:16 UT, GCN #27441, MASTER report GCN #27442, MASTER map and OT position. During inspection MASTER-Kislovodsk auto-detection system ( Lipunov et al., "MASTER Global Robotic Net", Advances in Astronomy, 2010, 30L ) discovered new OT source at (RA, Dec) = 11h 10m 12.51s +27d 49m 12.8s on 2020-03-25 16:21:15 UT. The OT unfiltered magnitude is 16.1m (mlim=17.8). The OT is seen in 2 inspect images (MASTER has 2 tubes at each observatory and works with large error-fields like Fermi in open mode, that gives 8 square degrees, i.e. 2x4sq.deg.). There is no minor planet at this place and no any sources in VIZIER database (22mag limit in POSS history). We have reference images on 2010-03-13.87244 UT with unfiltered mlim= 20.2m, on 2020-02-21 21:54:40UT with mlim=20.3. Spectral observations are required. The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/111012.51274912.8.png
GCN 27450 table
GRB_name GRB200325B
GCN_number 27450
Detection_method Swift Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 27450 SUBJECT: GRB 200325B: Swift ToO observations DATE: 20/03/26 18:35:03 GMT FROM: Phil Evans at U of Leicester P. A. Evans (U. Leicester) reports on behalf of the Swift team: Swift has initiated a ToO observation of the Fermi/GBM GRB 200325B. Automated analysis of the XRT data will be presented online at https://www.swift.ac.uk/ToO_GRBs/00020978 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 Fermi/GBM 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.
GCN 27452 table
GRB_name GRB200325B
GCN_number 27452
Detection_method Fermi GBM Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 27452 SUBJECT: GRB 200325B: Mondy and CrAO observations, Master MASTER OT J111012.51+274912.8 confirmation DATE: 20/03/26 23:30:56 GMT FROM: Alexei Pozanenko at IKI, Moscow A. Pozanenko (IKI), E. Klunko (ISTP), A. Sosnovskij (CrAO), M. Eselevich (ISTP), V. Rumyantsev (CrAO), S. Belkin (IKI), E. Mazaeva (IKI), A. Volnova (IKI) report on behalf of IKI-GRB-FuN: We observed the field of Fermi-GBM GRB 200325B (Fermi GBM team, GCN 27441) with AZT-33VM 1.5-m telescope of Sayan observatory (Mondy) starting on 2020-03-26 (UT) 15:08:10 and and ZTSh 2.6m telescope of CrAO starting on 2020-03-26 (UT) 20:11:20. We clearly detected the OT discovered by MASTER (Lipunov et al., GCN 27446). Coordinates of the OT are (J2000) 11:10:12.54 +27:49:11.7 with uncertainty of 0.5 arcses. The R magnitude of the OT is 19.8 +/- 0.15 at 2020-03-26 (UT) 15:08:10. Observations and data reduction is ongoing.
GCN 27455 table
GRB_name GRB200325B
GCN_number 27455
Detection_method Fermi GBM Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 27455 SUBJECT: GRB 200325B: Mondy, CrAO, AbAO afterglow confirmation and refined photometry of MASTER OT J111012.51+274912.8 DATE: 20/03/27 13:14:36 GMT FROM: Alexei Pozanenko at IKI, Moscow S. Belkin (IKI), A. Pozanenko (IKI), E. Klunko (ISTP), A. Sosnovskij (CrAO), R. Ya. Inasaridze (AbAO), V. Rumyantsev (CrAO), M. Eselevich (ISTP), E. Mazaeva (IKI), A. Volnova (IKI) report on behalf of IKI-GRB-FuN: We observed the MASTER OT J111012.51+274912.8 (Lipunov et al., GCN 27446) as a candidate in afterglow of the Fermi GRB 200325B (Fermi GBM team, GCN 27441) with AZT-33VM 1.5-m telescope of Sayan observatory (Mondy) starting on 2020-03-26 (UT) 15:08:10, ZTSh 2.6m telescope of CrAO starting on 2020-03-26 (UT) 20:11:20 (Pozanenko et al., GCN 27452), and AS-32 0.7m telescope of Abastumani observatory starting on 2020-03-26 (UT) 20:27:39. Below we present refined photometry of the OT. Preliminary photometry of the object is following. Date UT start t-T0 Filter Exp. OT Err UL(3sigma) telescope (mid, days) (s) 2020-03-26 15:08:10 1.0263 R 23*120 19.89 0.05 22.6 AZT-33VM 2020-03-26 20:11:20 1.2306 R 14*120 20.07 0.08 22.3 ZTSh 2020-03-26 20:27:39 1.2444 R 35*60 n/d n/d 20.0 AS-32 the photometry is based on nearby SDSS-DR12 stars RA DEC R(Lupton transformations) 167.569191 27.848262 16.015 167.513655 27.832992 16.930 167.510507 27.850424 15.261 We note that coordinates of the OT (Lipunov et al., GCN 27446; Pozanenko et al., GCN 27452) coincide with only one XRT source (https://www.swift.ac.uk/ToO_GRBs/00020978/ ) found in the error localization of GBM/Fermi. Taking into account the XRT source and fading OT we suggest the MASTER OT J111012.51+274912.8 is an afterglow GRB 200325B.
GCN 27456 table
GRB_name GRB200325B
GCN_number 27456
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 27456 SUBJECT: GRB 200325B: LCO Optical Detection DATE: 20/03/27 15:26:37 GMT FROM: Robert Strausbaugh at U. of the Virgin Islands R. Strausbaugh (U. of the Virgin Islands), A. Cucchiara (U. of the Virgin Islands/College of Marin) report on behalf of a larger collaboration: We observed Fermi GRB 200325A (Fermi GBM Team, GCN 27441) with the LCO 1-m Sinistro instrument at the Siding Spring Observatory, Australia site, on March 27, from 12:08 to 12:48 UT (corresponding to 45.25 to 45.92 hours from the GRB trigger time) with the Bessel R and I filters. We performed a series of 5x240s exposures in R and I. We detect a source consistent with other optical detections (Lipunov et al., GCN 27446, Pozanenko et al., GCN 27452) in stacked images. Using the USNO-B.1 catalog as reference, we obtain the following magnitudes: R = 21.36 +/- 0.11 I = 20.52 +/- 0.13 These magnitudes are not corrected for Galactic Extinction. R.S. is funded by NSF AST grant #1831682
GCN 27457 table
GRB_name GRB200325B
GCN_number 27457
Detection_method Swift-XRT Other
ra 167.5538°
decl 27.8196°
Circular_text TITLE: GCN CIRCULAR NUMBER: 27457 SUBJECT: GRB 200325B: Swift-XRT and UVOT observations DATE: 20/03/27 17:35:01 GMT FROM: Paolo D'Avanzo at INAF-OAB P. D'Avanzo (INAF-OAB), M.G. Bernardini (INAF-OAB), A. Melandri (INAF-OAB), T. Sbarrato (INAF-OAB), S. R. Oates (U. of Birmingham), M. H. Siegel (PSU), F. E. Marshall (NASA/GSFC), S. Dichiara (NASA/GSFC/UMCP) and P.A. Evans (U.Leicester) report on behalf of the Swift-XRT and UVOT teams: Swift-XRT has performed follow-up observations of the Fermi-detected burst GRB 200325B (Fermi GBM team, GCN Cir. 27441), collecting 1.1 ks of Photon Counting (PC) mode data between T0+102.4 ks and T0+124.8 ks in a single pointing covering the region of the candidate GRB optical counterpart initially reported by Lipunov et al. (GCN Circ. 27446). An uncatalogued X-ray source has been detected: Source 1: RA (J2000): 167.55381 = 11:10:12.91 Dec (J2000): +27.8196 = +27:49:10.5 Error: 4.9 arcsec (radius, 90% conf. [Enhanced position]) Count-rate: 0.020 [+/-0.005] ct s^-1 Flux: (7.2 [+/-1.8])e-13 erg cm^-2 s^-1 (observed, 0.3-10 keV) The source is below the RASS limit and, due to the limited amount of data available so far, shows no signs of fading. The position of this source is consistent with the one reported for the GRB optical afterglow (Lipunov et al., GCN Circ. 27446; Pozanenko et al., GCN Circ. 27452; Belkin et al., GCN Circ. 27455; Strausbaugh & Cucchiara, GCN Circ. 27456). We therefore conclude that this is the X-ray afterglow of GRB 200325B. The results of the XRT-team automatic analysis of the XRT observations, including a position-specific upper limit calculator, are available at https://www.swift.ac.uk/ToO_GRBs/00020978 . The Swift/UVOT began settled observations of the field of GRB 200325B 102ks after the Fermi/GBM trigger. An optical source consistent with the GRB optical afterglow (Lipunov et al., GCN Circ. 27446; Pozanenko et al., GCN Circ. 27452; Belkin et al., GCN Circ. 27455; Strausbaugh & Cucchiara, GCN Circ. 27456) is detected in the initial UVOT white exposure. A preliminary magnitude in white using the UVOT photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) is: Filter T_start(ks) T_stop(ks) Exp(s) Mag white 102.39 124.75 1044 21.27 ± 0.24 This magnitude is not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.03 in the direction of the burst (Schlegel et al. 1998).
GCN 27460 table
GRB_name GRB200325B
GCN_number 27460
Detection_method Fermi GBM Det
t_trigger 14:53:16.040 UTC
Circular_text TITLE: GCN CIRCULAR NUMBER: 27460 SUBJECT: GRB 200325B: Fermi GBM observation DATE: 20/03/28 00:39:30 GMT FROM: Christian Malacaria at NASA-MSFC/USRA C. Malacaria (NASA-MSFC/USRA) and C. Meegan (UAH) report on behalf of the Fermi GBM Team: "At 14:53:16.04 UT on 25 March 2020, the Fermi Gamma-Ray Burst Monitor (GBM) triggered and located GRB 200325B (trigger 606840801 / 200325620), which was also detected by the Swift/XRT (GCN 27457). The optical counterpart was detected by MASTER (GCN 27446), Mondy (GCN 27452), and LCO (GCN 27457). The angle from the Fermi LAT boresight at the GBM trigger time is 102.5 degrees. The GBM light curve shows a broad peak with several spikes overimposed, with a duration (T90) of about 36.6 s (50-300 keV). The time-averaged spectrum from T0-8.1 s to T0+36.9 s is best fit by a power law function with an exponential high-energy cutoff. The power law index is -1.33 +/- 0.04 and the cutoff energy, parameterized as Epeak, is 150.1 +/- 12.8 keV. The event fluence (10-1000 keV) in this time interval is (1.12 +/- 0.04)e-5 erg/cm^2. The 1-sec peak photon flux measured starting from T0+10.7 s in the 10-1000 keV band is 9.1 +/- 0.3 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 27464 table
GRB_name GRB200325B
GCN_number 27464
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 27464 SUBJECT: GRB 200325B: Tautenburg observations DATE: 20/03/28 20:01:16 GMT FROM: Sylvio Klose at TLS Tautenburg S. Klose, B. Stecklum, A. Nicuesa Guelbenzu, S. Melnikov, and F. Ludwig (all Tautenburg) report: We observed the field of GRB 200325B (Ferni GBM team, GCN 27441) with the Tautenburg 1.34m Schmidt telescope equipped with the TAUKAM 6k x 6k CCD camera and the wide V-band filter (VB). The transmission curve of this filter closely follows the Gaia GBP filter. Observations were performed during several epochs starting 1.2 days after the burst. The optical transient discovered by the MASTER Global Robotic Net (Lipunov et al., GCN 27446) is clearly detected (see also Pozanenko et al., GCN 27452; Belkin et al., GCN 27455; Strausbaugh et al., GCN 27456; D'Avanzo et al., GCN 27457). Aperture photometry was performed using several Gaia DR2 stars in the field. Between dt = 1.2 and 2.4 days the optical transient was fading by 1.3 mag. During our last observation (2.4 days post burst) it had reached VB = 20.7 +/- 0.2 mag.
GCN 27465 table
GRB_name GRB200325B
GCN_number 27465
Detection_method Fermi GBM Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 27465 SUBJECT: GRB 200325B: Mondy continued observations DATE: 20/03/28 21:26:56 GMT FROM: Alexei Pozanenko at IKI, Moscow S. Belkin (IKI), A. Pozanenko (IKI), E. Klunko (ISTP), M. Eselevich (ISTP), E. Mazaeva (IKI), A. Volnova (IKI) report on behalf of IKI-GRB-FuN: We observed the MASTER OT J111012.51+274912.8 (Lipunov et al., GCN 27446) afterglow of the Fermi GRB 200325B (Fermi GBM team, GCN 27441) with AZT-33IK 1.5-m telescope of Sayan observatory (Mondy) starting on 2020-03-27 (UT) 14:07:34. Preliminary photometry of the OT is following. Date UT start t-T0 Filter Exp. OT Err UL(3sigma) (mid, days) (s) 2020-03-27 14:07:34 1.9877 R 28*120 21.15 0.06 23.1 the photometry is based on nearby SDSS-DR12 stars RA DEC R(Lupton transformations) 167.569191 27.848262 16.015 167.513655 27.832992 16.930 167.510507 27.850424 15.261 The photometry presented above corroborates the photometry presented by LCO (Strausbaugh et al. GCN 27456) at about the same time.
GCN 27467 table
GRB_name GRB200325B
GCN_number 27467
Detection_method Fermi GBM Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 27467 SUBJECT: GRB 200325B: Mondy continued observations DATE: 20/03/29 12:18:52 GMT FROM: Alexei Pozanenko at IKI, Moscow S. Belkin (IKI), A. Pozanenko (IKI), E. Klunko (ISTP), M. Eselevich (ISTP), E. Mazaeva (IKI), A. Volnova (IKI) report on behalf of IKI-GRB-FuN: We observed the MASTER OT J111012.51+274912.8 (Lipunov et al., GCN 27446) afterglow of the Fermi GRB 200325B (Fermi GBM team, GCN 27441) with AZT-33IK 1.5-m telescope of Sayan observatory (Mondy) starting on 2020-03-28 (UT) 14:50:17. Preliminary photometry of the OT is following. Date UT start t-T0 Filter Exp. OT Err UL(3sigma) (mid, days) (s) 2020-03-28 14:50:17 3.01182 R 20*120 21.82 0.13 23.4 the photometry is based on nearby SDSS-DR12 stars RA DEC R(Lupton transformations) 167.569191 27.848262 16.015 167.513655 27.832992 16.930 167.510507 27.850424 15.261
GCN 27468 table
GRB_name GRB200325B
GCN_number 27468
Detection_method Fermi GBM Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 27468 SUBJECT: GRB 200325B: Mondy continued observations DATE: 20/03/30 16:43:10 GMT FROM: Alexei Pozanenko at IKI, Moscow S. Belkin (IKI), A. Pozanenko (IKI), E. Klunko (ISTP), M. Eselevich (ISTP), E. Mazaeva (IKI), A. Volnova (IKI) report on behalf of IKI-GRB-FuN: We observed the MASTER OT J111012.51+274912.8 (Lipunov et al., GCN 27446) afterglow of the Fermi GRB 200325B (Fermi GBM team, GCN 27441) with AZT-33IK 1.5-m telescope of Sayan observatory (Mondy) starting on 2020-03-29 (UT) 13:47:58. Preliminary photometry of the OT is following. Date UT start t-T0 Filter Exp. OT Err UL(3sigma) (mid, days) (s) 2020-03-29 13:47:58 3.96785 R 19*120 22.30 0.25 22.4 the photometry is based on nearby SDSS-DR12 stars RA DEC R(Lupton transformations) 167.569191 27.848262 16.015 167.513655 27.832992 16.930 167.510507 27.850424 15.261
GCN 27471 table
GRB_name GRB200325B
GCN_number 27471
Detection_method Swift-XRT Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 27471 SUBJECT: GRB 200325B: further Swift-XRT observations DATE: 20/04/01 14:42:38 GMT FROM: Paolo D'Avanzo at INAF - OAB A. D'Ai (INAF-IASFPA), A. Tohuvavohu (U. Toronto), B. Sbarufatti (PSU), D.N. Burrows (PSU), J.P. Osborne (U. Leicester), K.L. Page (U. Leicester), A.P. Beardmore (U. Leicester), A. Melandri (INAF-OAB), T. Sbarrato (INAF-OAB) and P.A. Evans (U. Leicester) report on behalf of the Swift-XRT team: Swift-XRT has performed further follow-up observations of the GBM-detected burst GRB 200325B (Fermi GBM team, GCN Cir. 27441), collecting overall 4.6 ks of Photon Counting (PC) mode data between T0+102.4 ks and T0+505.5 ks. The uncatalogued X-ray source (Source 1) reported in D'Avanzo et al. (GCN Circ. 27457) has faded with alpha >1.2, confirming that this is the GRB afterglow. The results of the XRT-team automatic analysis of the afterglow are at https://www.swift.ac.uk/ToO_GRBs/00020978/Source1.php. The results of the full analysis of the XRT observations are available at https://www.swift.ac.uk/ToO_GRBs/00020978. This circular is an official product of the Swift-XRT team.
GCN 27473 table
GRB_name GRB200325B
GCN_number 27473
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 27473 SUBJECT: GRB 200325B: Optical upper limit DATE: 20/04/02 10:08:41 GMT FROM: Amit Kumar at ARIES, India TITLE: GCN CIRCULAR NUMBER: 27472 SUBJECT: GRB 200325B: Optical upper limit DATE: 20/04/02 9:44:53 GMT FROM: Amit Kumar at ARIES, India A. Kumar (ARIES), A. Aryan (ARIES), S. B. Pandey (ARIES), R. Gupta (ARIES), A. Ghosh (ARIES), Dimple (ARIES), and K. Misra (ARIES) report: We observed the optical afterglow field of the Fermi GRB 200325B (Fermi GBM team, GCN 27441, Lipunov et al., GCN 27446) with 1.3m Devsthal Fast Optical Telescope (DFOT) at Aryabhatta Research Institute of Observational Sciences (ARIES), Nainital (India), from 2020-03-30 UT 19:37:08 to 2020-03-30 UT 20:59:28. We observed 16 frames each of 300 seconds in Bessell I filter. No new optical source was detected within the Swift XRT enhanced error circle in any individual as well as stacked frame. The 3-sigma upper limit is as follows: T_start-T0 (days) Start Date (UTC) End Date (UTC) Filter 3-sigma upper limit (mag) --------------------------------------------------------------------------------------------------------------- 5.21 2020-03-30 19:37:08 2020-03-30 20:59:28 I >23.2 Photometry is done based on the standard star PB 2256 and USNO-B1.0 catalog. The quoted magnitude is not corrected for Galactic extinction.
GCN 27481 table
GRB_name GRB200325B
GCN_number 27481
Detection_method Fermi GBM Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 27481 SUBJECT: GRB 200325B: Mondy continued observations DATE: 20/04/03 08:42:32 GMT FROM: Alexei Pozanenko at IKI, Moscow S. Belkin (IKI), A. Pozanenko (IKI), E. Klunko (ISTP), M. Eselevich (ISTP), E. Mazaeva (IKI), A. Volnova (IKI) report on behalf of IKI-GRB-FuN: We continued observations of the MASTER OT J111012.51+274912.8 (Lipunov et al., GCN 27446) which is now is confirmed afterglow (Pozanenko et al., GCN 27452; Strausbaugh et al., GCN 27456; Klose et al., GCN 27464; D'Ai et al., GCN 27471) of the Fermi GRB 200325B (Fermi GBM team, GCN 27441) with AZT-33IK 1.5-m telescope of Sayan observatory (Mondy). Preliminary photometry of the OT is following. Date UT start t-T0 Filter Exp. OT Err UL(3sigma) (mid, days) (s) 2020-03-30 15:07:22 5.03063 R 30*120 22.40 0.20 22.7 2020-03-31 17:09:44 6.11561 R 30*120 22.45 0.17 22.8 2020-04-01 16:40:59 7.10254 R 40*120 n/d n/d 22.6 the photometry is based on nearby SDSS-DR12 stars RA DEC R(Lupton transformations) 167.569191 27.848262 16.015 167.513655 27.832992 16.930 167.510507 27.850424 15.261 A light curve of the GRB 200325B afterglow based on our observations (Belkin et al., GCNs 27455, 27465, 27467, 27468) can be found at http://grb.rssi.ru/GRB200325B/GRB200325B_lc.png