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.
Search for Circulars by submitter, subject, or body text (e.g. 'Fermi GRB').
To navigate to a specific circular, enter the associated Circular ID (e.g. 'gcn123', 'Circular 123', or '123').
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"36353 results found.
- GRB 230911D: Fermi GBM observation
- IPN triangulation of GRB 230911D (long)
- GRB 230911D: Fermi-LAT detection
- GRB230911C: LCOGT Optical Upper Limits
- GRB 230911C: Swift/UVOT Upper Limits
- GRB 230911B: GRBAlpha and VZLUSAT-2 joint detection
- GRB 230911C: GOTO optical upper limits
- GRB 230908A: Swift/BAT-GUANO detection of a long burst outside the coded FOV
- GRB 230911B: correction to the KW GCN 34659
- Konus-Wind detection of GRB 230811D
- GRB 230911C: Enhanced Swift-XRT position
- GRB 230911D: BALROG localization (Fermi Trigger 716111594/ GRB 230911329)
- GRB 230911D: Fermi GBM Final Localization
- GRB 230911C: Swift detection of a burst
- Fermi GRB 230911B: Global MASTER-Net observations report
- GRB 230911B: Fermi GBM Final Real-time Localization
- GRB 230911A: Fermi GBM Final Real-time Localization
- GRB 230906A: BlackGEM upper limits
- GRB 230903A: TESS observations of optical emission
- GRB 230906A: AstroSat CZTI detection
- GRB 230910A: Fermi GBM Final Real-time Localization
- GRB 230908A: GRBAlpha detection
- GRB 230908A: AstroSat CZTI detection
- Glowbug gamma-ray detection GRB 230905B
- GRB 230906A: Swift/UVOT Upper Limits
- GRID detection of GRB 230827A
- GRB 230818A: radio observation with the VLA
- GRB 230205A: LBT spectroscopy of two host galaxy candidates
- GRB 230906A: Swift-XRT observations
- Konus-Wind detection of GRB 230906A (short)
- IPN triangulation of GRB 230906A (short)
- GRB 230906A: Swift ToO observations
- GRB 230905B: AstroSat CZTI detection
- Fermi GRB 230906A: Global MASTER-Net observations report
- GRB 230812B: Chandra late-time detection of the X-ray afterglow
- GRB 230906A: Fermi GBM Final Localizationn
- GRB 230905B: GECAM-C detection of a long burst
- GRB 230905A: Fermi GBM Final Real-time Localization
- GRB 230903A: Swift-XRT refined Analysis
- GRB 230903A: Enhanced Swift-XRT position
- GRB 230903A: VLT/X-shooter optical observations
- GRB 230903A: Swift-BAT refined analysis
- GRB 230904C: Fermi GBM Final Localization
- Fermi GRB 230903A: Global MASTER-Net observations report
- GRB 230903A: Fermi GBM detection
- GRB 230904B is not a GRB
- GRB 230904B: BALROG localization (Fermi Trigger 715526984 / GRB 230904562)
- Fermi GRB 230904A: Global MASTER-Net observations report
- GRB 230904A: Fermi GBM Final Real-time Localization
- GRB 230903A: LCOGT Optical Upper Limits
- GRB 230903A: Swift detection of a burst
- GRB 230903A: Fermi GBM Final Real-time Localization
- GRB 230827B: Glowbug gamma-ray detection
- GRB 230827A: Glowbug gamma-ray detection
- GRB 230826A: Glowbug gamma-ray detection
- GRB 230827B: Swift-XRT afterglow detection
- GRB 230812B: Spectroscopic detection of the associated SN 2023pel.
- GRB 230827B: Swift ToO observations
- GRB 230827A: Fermi GBM Observation
- GRB 230827B: CALET Gamma-Ray Burst Monitor detection
- GRB 230826A: Swift-BAT refined analysis
- GRB 230828A: AstroSat CZTI detection
- GRB 230828A: GRBAlpha detection
- Swift Trigger 1188089 is not a GRB
- GRB 230827A: VZLUSAT-2 detection
- GRB 230827A: Swift/BAT-GUANO detection of a burst outside the coded FOV
- GRB 230826A: VZLUSAT-2 detection
- GRB 230827B: VZLUSAT-2 detection
- GRB 230827B / GRB 230827256: Fermi GBM Observation
- GRB 230827A: GRBAlpha detection
- Subject: GRB230826A: Swift/UVOT upper limits
- GRB 230827A: BALROG localization (Fermi Trigger / GRB 230827762)
- GRB 230827.256: AKO Optical follow-up of ZTF23abaanxz (AT 2023qxj)
- Fermi GRB 230827A: Global MASTER-Net observations report
- Swift J1727.8-1613 (GRB 230824A): Osservatorio Astronomico "Nastro Verde" optical observations
- GRB 230827.256 : GIT optical follow-up of ZTF23abaanxz/AT2023qxj
- GRB 230827A: Fermi GBM Final Real-time Localization
- AT 2023qxj: ZTF discovery of the likely afterglow of Fermi GRB 230827256
- Swift J1727.8-1613 (GRB 230824A): Montarrenti Observatory photometric observations
- GRB 230826A: GRBAlpha detection
- GRB 230826A: Fermi GBM Observation
- Swift J1727.8-1613 (GRB 230824A): Leavitt Observatory optical observations
- GRB 230826A: Enhanced Swift-XRT position
- GRB 230826A: Swift-XRT refined Analysis
- GRB 230826A: Mondy optical observations
- Swift J1727.8-1613 (GRB 230824A): GAD Observatory La Spezia - optical observations
- GRB 230826A: Swift detection of a burst
- GRB 230826A: Fermi GBM Final Real-time Localization
- Swift J1727.8-1613 (GRB 230824A): Bassano Bresciano Observatory optical observations
- GRB 230824A: AKO Photometric Follow-up Observations
- GRB 230818B: CALET Gamma-Ray Burst Monitor detection
- LIGO/Virgo/KAGRA S230825k: Upper limits from Swift/BAT-GUANO
- Trigger 1187225: Swift detection of Swift J1727.8-1613 (AKA GRB 230824A)
- Swift J1727.8-1613 (GRB 230824A): Skynet Optical Observations
- Trigger 1187207: Swift detection of Swift J1727.8-1613 (AKA GRB 230824A)
- Trigger 1187203: Swift detection of Swift J1727.8-1613 (AKA GRB 230824A)
- GRB 230812B: radio detection with the VLA
- Fermi Gamma-ray Burst Monitor trigger 714618399/230825046 is not a GRB
- NICER detection of Swift J1727.8-1613 (GRB 230824A)
- Trigger 1187142: Swift detection of Swift J1727.8-1613 (AKA GRB 230824A)