GCN Circulars
GCN Circulars are rapid bulletins submitted by and distributed to the community. 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').
Advanced Search
To narrow the search results, use advanced search syntax. This allows for specifying which circular field to search (submitter, subject, and/or body). For additional information, refer to the advanced search documentation.
Advanced Search Examples (click to copy):
subject:"Swift"body:"GRB"submitter:"Judith Racusin"19666 results found.
- Swift GRB200216.56: Global MASTER-Net observations report
- GRB 200215A: Swift-BAT refined analysis
- GRB 200215A: Swift-XRT refined Analysis
- GRB 200215A: Swift/UVOT Upper Limits
- GRB 200215A: Enhanced Swift-XRT position
- GRB 200215A: Fermi GBM detection
- Swift GRB200215.61: Global MASTER-Net observations report
- GRB 200215A: Swift detection of a burst
- LIGO/Virgo S200213t: Swift/BAT in the South Atlantic Anomaly
- LIGO/Virgo trigger S200213t: Possible host galaxies
- Konus-Wind observation of GRB 200205B
- GRB 200205B: Chilescope optical observations
- LIGO/Virgo S200208q: no counterpart candidates in the Swift/BAT observations
- GRB 200205B: Swift-BAT refined analysis
- Swift J0840.7-3516 (AKA GRB 200205A): Swift-BAT refined analysis
- Swift Trigger 954840 is not a GRB
- Swift GRB200207.13: Global MASTER-Net observations report
- GRB 200205B: Swift/UVOT Detection
- GRB 200205A = Swift J0840.7-3516: optical photometry in Chilescope observatory
- GRB 200205B: Swift-XRT refined Analysis
- GRB 200205A = Swift J0840.7-3516, A newly discovered transient X-ray Pulsar
- GRB 200205B: Enhanced Swift-XRT position
- GRB 200205A: Enhanced Swift-XRT position
- GRB 200205B: LCO Optical Detection
- GRB 200205B: Swift detection of a burst with optical counterpart
- Swift GRB200205.81: Global MASTER-Net observations report
- Swift GRB200205.81: Global MASTER-Net OT detection
- GRB 200205A / Swift trigger 954304: VLT optical observations
- GRB 200205A: MAXI/GSC detection
- GRB 200205A: REM optical observations
- GRB 200205A: MASTER Ot detection
- Swift GRB 200205A: Global MASTER-Net observations report
- GRB 200205A: Swift detection of a burst with a possible UV counterpart
- Konus-Wind observation of GRB 200131A
- GRB 200131A: CALET Gamma-Ray Burst Monitor detection
- GRB 200131A: Swift-BAT refined analysis
- ZTF Discovery of ZTF20aajnksq: a Rapidly Fading Luminous Transient in the GRB 200128A Localiziation Region
- GRB 200131A: Swift/UVOT Detection
- GRB 200131A: Swift-XRT refined Analysis
- GRB 200131A: VIRT optical transient detection
- GRB 200131A: LCO Optical Detection
- GRB 200131A: KAIT Optical Upper Limit
- GRB 200131A: Enhanced Swift-XRT position
- GRB 200131A: MASTER optical transient detection
- GRB 200131A: Swift detection of a burst with an optical counterpart
- Swift GRB200131.95: Global MASTER-Net observations report
- IPN triangulation of GRB 200130B
- LIGO/Virgo S200129m: no counterpart candidates in the Swift/BAT observations
- GRB 200127A: Swift-BAT refined analysis
- Konus-Wind observation of GRB 200125A
- LIGO/Virgo S200128d: no counterpart candidates in the Swift/BAT observations
- GRB 200127A: Swift/UVOT Upper Limits
- GRB 200127A: Mondy optical upper limit
- GRB 200127A: Nanshan-0.6m optical upper limit
- GRB 200127A: Enhanced Swift-XRT position
- GRB 200127A: Swift-XRT refined Analysis
- GRB 200127A: AbAO optical upper limit
- GRB 200125A: Swift-BAT refined analysis
- Swift GRB200127.61: Global MASTER-Net observations report
- GRB 200127A: Swift detection of a burst
- GRB 200125A: Further Swift-XRT observations
- GRB 200125A: Swift/UVOT Upper Limits
- GRB 200125A: AbAO optical upper limit
- Correction to GRB 200125A: Swift-XRT refined analysis
- GRB 200125A: Swift-XRT refined Analysis
- GRB 200125A: Nanshan-0.6m optical upper limit
- GRB 200125A: RATIR Optical Observations
- Swift GRB 200125A: Global MASTER-Net observations report
- GRB 200125A: Enhanced Swift-XRT position
- GRB 200125A: Swift detection of a burst
- GRB 200122A: Optical upper limit: correction to the GCN circ. 26870
- GRB 200122A: AstroSat CZTI detection
- GRB 200122A: Optical upper limit
- GRB 200122A: Mondy optical upper limit
- Konus-Wind observation of GRB 200122A
- GRB 200122A: MITSuME Akeno optical upper limits
- LIGO/Virgo S200115j: Zwicky Transient Facility search for optical counterparts to Swift X-ray sources
- GRB 200122A: RATIR Optical Observations
- GRB 200122A: Swift-BAT refined analysis
- GRB 200122A: Xinglong-2.16m optical upper limit
- GRB 200122A: Swift/UVOT Upper Limits
- IPN Triangulation of GRB 200120A
- LIGO/Virgo S200115j: Further Swift-XRT sources
- GRB 200122A: GOTO non-detection of optical afterglow
- GRB 200122A: Swift-XRT refined Analysis
- GRB 200122A: Enhanced Swift-XRT position
- Swift GRB 200122A: Global MASTER-Net observations report
- GRB 200122A: Swift detection of a burst
- GRB 191031D: XMM-Newton upper limit
- GRB 200115A: CALET Gamma-Ray Burst Monitor detection
- LIGO/Virgo S200115j: Swift/UVOT observations of Swift/XRT S200115j_X136
- GRB 200115A: AROMA-N Optical Observation
- LIGO/Virgo S200115j: Swift-XRT sources
- LIGO/Virgo S200114f: ZTF Forced Photometry of the Swift Source S200114f_X2
- GRB 200115A: DDOTI/OAN optical observations report
- LIGO/Virgo S200114f: Possible X-ray transient
- LIGO/Virgo S200114f: Swift-XRT sources and observations
- GRB 200115A: Swift-BAT refined analysis
- LIGO/Virgo S200115j: no counterpart candidates in the Swift/BAT observations
- IPN triangulation of GRB 200111A