GCN Circulars
GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. See the documentation for help with subscribing to or submitting Circulars.
To navigate to a specific circular, enter the associated Circular ID (e.g. 'gcn123', 'Circular 123', or '123').
104 results found.
- GRB 240414A: Swift/UVOT Detection
- Swift GRB240123.46: Global MASTER-Net observations report
- GRB 220611A: Swift/UVOT Upper Limits
- GRB 220306B: Swift/UVOT Upper Limits
- Fermi GRB 220222B: Global MASTER-Net observations report
- GRB 210930A: Swift/UVOT Upper Limits
- Fermi trigger No 652585475: Global MASTER-Net observations report
- GRB 210901A: Enhanced Swift-XRT position
- Fermi trigger No 649072251: Global MASTER-Net observations report
- Fermi trigger No 647624281: Global MASTER-Net observations report
- GRB 210323A: Swift/UVOT Upper Limits
- GRB 201104B: Swift-BAT refined analysis
- Fermi GRB 200909A: Global MASTER-Net observations report
- GRB 200803A: Fermi GBM detection
- Baksan Neutrino Observatory Alert 200601.42: Global MASTER-Net observations report
- Swift GRB200306.95: Global MASTER-Net observations report
- GRB 200215A: Swift/UVOT Upper Limits
- GRB 200122A: Swift-BAT refined analysis
- Fermi trigger No 594557071: Global MASTER-Net observations report
- GRB 191017B: Swift/UVOT Upper Limits
- LIGO/Virgo S190425z: COATLI Observations of Galaxies
- GRB 181002A: Swift/UVOT Upper Limits
- GRB 180504A: Swift/UVOT Upper Limits
- GRB 180425A: Swift/UVOT Upper Limits
- GRB 180418A: TAROT La Silla observatory early optical observations
- GRB 180404A: Swift/UVOT Detection
- Trigger 813449: Swift detection of large burst from XTE J1701-407
- GRB 171216A: Swift-BAT refined analysis
- GRB 170813A: Swift/UVOT Upper Limits
- GRB 170531B: Swift/UVOT Detection
- GRB170519A, Swift-UVOT Detection
- GRB 170510A: Fermi GBM observation
- GRB 160801A: Swift/UVOT Upper Limits
- Swift-BAT trigger 686845 was due to noise near a known source
- GRB 160408A: Swift-BAT refined analysis
- GRB 151229A: Swift/UVOT observations
- GRB 151210A: Swift/UVOT Upper Limits
- Swift trigger 637807 is probably not an astrophysical source
- GRB 150213B: Swift/UVOT Detection
- GRB 140810A: Fermi GBM observation
- GRB 140622A: An unusual short event, Swift-BAT refined analysis
- GRB 131030A: Swift/UVOT Detection
- GRB 130527A: Swift-BAT refined analysis
- Trigger 538084: Swift detection of XTE J1739-302
- GRB 120119A: Swift/UVOT Observations
- GRB 111204A: Swift/UVOT Upper Limits
- GRB 111022B: Swift/UVOT upper limits
- GRB 111008A, Swift-BAT refined analysis,
- Swift J1822.3-1606: Transient Magnetar or Be X-ray Binary?
- Swift J185003.2-005627: Swift-BAT refined analysis
- SGR 1E 1841-045: Swift-BAT refined analysis
- Swift/UVOT observations of GRB110210a.
- GRB 110128A: Swift/UVOT observations
- GRB 101011A: Swift-BAT refined analysis
- IBAS Alert n. 6057 is not due to a GRB
- GRB 100628A: Swift/UVOT Upper Limits
- Trigger 424161: Swift/BAT trigger on XTE J1946+274/GRO J1944+26
- GRB 100514A: Swift-BAT refined analysis
- Swift-BAT trigger 421695 is likely not astrophysical
- IBAS Alert 5992 is not a GRB, but XTE J1855-026
- GRB 100206A: Swift-BAT refined analysis
- Swift/UVOT refined analysis of GRB100117A
- Swift/BAT Detects an Outburst from XTE J1901+014
- Swift Trigger #382159 is due to XTE J1752-223
- Swift-BAT trigger 373691 is a galactic bulge transient
- GRB 091010: RXTE detection
- GRB 090727: Swift-BAT refined analysis
- GRB 090429A: Swift-BAT refined analysis
- GRB 090113: Swift-BAT refined analysis
- GRB 080805, Swift-BAT refined analysis
- Swift detection of XTE J1701-407
- Trigger 317205: Swift detection of an outburst from XTE J1701-407
- GRB 080607, Swift-BAT refined analysis
- GRB 080602, Swift-BAT refined analysis
- A giant outburst from Cygnus X-1 detected by Konus-Wind and Suzaku-WAM
- GRB 070731, Swift-BAT refined analysis
- Swift/UVOT observations of GRB070429B
- GRB 070318, Swift-BAT refined analysis
- GRB 070209, Swift-BAT refined analysis of the short hard burst
- GRB 061222A, Swift-BAT refined analysis
- GRB 060908, Swift-BAT refined analysis
- GRB 060807: Refined analysis of the Swift-BAT burst
- Konus-Wind observation of GRB 060614
- GRB 060312: Refined analysis of the Swift-BAT burst
- GRB 060223B: Swift-BAT refined analysis
- GRB 060223: Swift-BAT refined analysis
- GRB 060115: Refined analysis of the Swift-BAT burst
- H11603: An X-ray flare from V4641 Sgr, or a possible XRF
- HETE/IPN localization of GRB040403A (=H3143, a long burst) and GRB040403B(=H3144, a short/hard burst)
- SGR 1806-20 bursts with INTEGRAL and IBAS announcement on Soft Gamma-Ray Repeaters
- IPN detection of continued activity from SGR1806-20
- IPN triangulation of GRB030101 (two large error boxes)
- Detection of activity from SGR 1900+14 with the RXTE/PCA
- RXTE Observations of SGR 1900+14
- The X-ray Flash 011030 ('GRB 011030')
- SGR 1900+14 : RXTE observations
- Further Optical Observations of GRB 010324
- Optical Observations of GRB 010324
- GCN resumes full operations
- Chandra observation of the X-ray afterglow of GRB991216