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').
17435 results found.
- GRB 231215A: GROWTH-India optical follow-up
- GRB 231215A : Nanshan/HMT optical observations
- GRB 231215A: AstroSat CZTI detection
- GRB 231215A : MITSuME Akeno optical afterglow candidate detection
- GRB 231214A: Swift-XRT refined Analysis
- GRB 231215A: Mondy optical bright afterglow detection
- GRB 231214A: AstroSat CZTI detection
- GRB 231215C: MASTER OT detection
- Swift GRB231215.41: Global MASTER-Net observations report
- GRB 231215A: Swift-XRT observations
- GRB 231215A: Swift detection of a burst
- GRB 231214A: Fermi-LAT detection
- GRB 231214A: Enhanced Swift-XRT position
- GRB 231214B: Swift/BAT-GUANO detection of a burst
- GRB231214A: BOOTES-6/DPRT optical upper limit
- Swift GRB231214.85: Global MASTER-Net observations report
- GRB 231214A: Swift detection of a burst
- GRB 231210B: REM optical/NIR upper limits
- LIGO/Virgo/KAGRA S231206cc: Upper limits from Swift/BAT-GUANO
- LIGO/Virgo/KAGRA S231206ca: Upper limits from Swift/BAT-GUANO
- GRB 231210B: MeerLICHT afterglow observations
- GRB 231210B: Swift-BAT refined analysis
- GRB 231210B: Swift-XRT refined Analysis
- GRB 231210B: Enhanced Swift-XRT position
- GRB 231210B: VLT/X-shooter redshift
- GRB 231210B: detection of the optical counterpart with the LCOGT 40cm telescope at Sutherland Observatory
- GRB 231210B: Swift detection of a burst with optical counterpart
- Swift GRB231210.90: Global MASTER-Net OT detection
- Swift GRB231210.90: Global MASTER-Net observations report
- IPN triangulation of GRB 231129C
- GRB231205B: Swift/UVOT Upper Limits
- GRB 231205B: Swift-BAT refined analysis
- GRB 231205B: 1.3m DFOT Optical upper limit
- GRB 231205B: AGILE detection
- GRB 231205B: Ondrejov D50 optical upper limit
- GRB 231205B: Swift-XRT refined Analysis
- GRB 231205B: REM optical/NIR upper limits
- GRB 231129C: ASIM MXGS observation and localization
- GRB 231205B: r'-band observations from MISTRAL at Observatoire de Haute-Provence
- GRB 231205B : MITSuME Akeno optical upper limits
- GRB 231205B: Zadko observatory - Gingin optical observations
- GRB 231205B: Gaoyazi/GOT optical upper limit
- GRB 231205B: Nanshan/HMT optical upper limit
- GRB 231205B: GECAM-B detection of a long burst
- GRB 231205B: LCOGT Optical Upper Limits
- GRB 231205B: Enhanced Swift-XRT position
- Swift GRB231205.70: Global MASTER-Net observations report
- GRB 231205B: AKO Optical Upper Limit
- GRB 231205B: Swift detection of a burst
- LIGO/Virgo/KAGRA S231129ac: Upper limits from Swift/BAT-GUANO
- GRB 231203A: Fermi GBM Observation
- GRB 231203A: Swift/BAT-GUANO detection of a burst outside the coded FOV
- Konus-Wind detection of GRB 231129C
- GRB 231129C: Swift-XRT afterglow detection
- GRB 231129C: PROMPT optical upper limits for the MAXI/GSC X-ray counterpart and the MASTER afterglow candidate
- GRB 231129A: VZLUSAT-2 detection
- GRB 231129B: Swift-XRT observations
- GRB 231129C: AGILE detection
- GRB 231129A : MITSuME Akeno optical upper limits
- GRB 231129C: Swift/BAT-GUANO localization of a burst outside the coded FOV
- GRB 231129A: Swift-BAT refined analysis
- GRB 231129C: MASTER OT detection
- GRB 231129A: BOOTES-5/JGT optical upper limit
- GRB 231129A: JinShan optical upper limit
- GRB 231129C: Swift-XRT observations
- GRB 231129A: Swift/UVOT Upper Limits
- GRB 231129A: optical upper limit in Mondy observatory
- GRB 231129C: Tiled Swift observations
- GRB 231129A: Enhanced Swift-XRT position
- GRB 231129A: Swift-XRT refined Analysis
- GRB 231129B: Tiled Swift observations
- GRB 231129A: GECAM-C detection of a long burst
- GRB 231129A: INTEGRAL detection of a long GRB
- GRB 231129A: Swift detection of a burst
- GRB 231123C: Fermi GBM Observation
- GRB 231123B: Fermi GBM Observation
- GRB 231123B: Swift/BAT-GUANO detection of a burst outside the coded FOV
- GRB 231111A: Optical follow-up observations at Terskol, AbAO, Maidanak, Mondy, Assy
- GRB 231123C: Insight-HXMT/HE detection
- GRB 231123C (short): Glowbug gamma-ray detection
- GRB230506B: VIRT optical upper limit
- GRB 231123C: Swift/BAT-GUANO detection of a short burst likely outside the coded FOV
- GRB 231115A: XMM-Newton observation
- GRB 231118A: REM optical afterglow detection
- GRB 231122B: AstroSat CZTI detection
- GRB 231122B: CALET Gamma-Ray Burst Monitor detection
- GRB 231122B: Swift/BAT-GUANO detection of a long burst outside the coded FOV
- GRB 231118A: ATCA detection of radio counterpart
- GRB 231117A: Swift/UVOT late time observations
- GRB 231117A: Swift-BAT refined analysis
- GRB 231118A: GRBAlpha detection
- LIGO/Virgo/KAGRA S231118d: Upper limits from Swift/BAT-GUANO
- LIGO/Virgo/KAGRA S231118an: Upper limits from Swift/BAT-GUANO
- LIGO/Virgo/KAGRA S231114n: Upper limits from Swift/BAT-GUANO
- LIGO/Virgo/KAGRA S231113bb: Upper limits from Swift/BAT-GUANO
- GRB 231118A: VZLUSAT-2 detection
- GRB 231118A: Swift-BAT refined analysis
- GRB 231117A: CALET Gamma-Ray Burst Monitor detection
- 231118A: Swift-UVOT Detection
- GRB231117A: Swift-UVOT detection