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.
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"31633 results found.
- GRB 080905B: VLT redshift
- GRB 080905A: NOT and VLT observations
- GRB 080905B, Swift-BAT refined analysis
- GRB 080905A, Swift-BAT refined analysis
- GRB 080905A: Swift-XRT Refined Analysis
- GRB 080825C: Fermi GBM Spectral Analysis
- GRB080825C: Fermi-LAT observations
- GRB 080903: Swift/UVOT Observations
- GRB 080903: Swift-XRT Refined Analysis
- GRB 080903, Swift-BAT refined analysis
- GRB 080903: optical observations
- GRB 080903: Liverpool Telescope observations
- GRB 080903: Astrotel-Caucasus optical observations
- GRB 080903: Optical afterglow candidate
- GRB 080903: ROTSE-III Optical Limits
- Recent VLA non-detection of SGR 0501+4516
- SGR 0501+4516: Spin Down Rate and Inferred Dipole Magnetic Field
- SGR 0501+4516: preliminary results of the first XMM-Newton observation
- nIR observations of SGR 0501+4516
- INTEGRAL ToO observation of SGR0501+4516
- SGR 0501+4516: Confirmation of the NIR counterpart
- GRB080828: Swift/UVOT Upper Limits
- SGR 0501+4516: Detection of possible optical counterpart
- SGR 0501+4516: WHT observations of the possible near-infrared counterpart
- GRB080825B: Swift/UVOT Upper Limits
- GRB 080828: Swift-XRT detection of a possible X-ray afterglow
- Swift-BAT trigger 322590 is not a GRB
- VLA non-detection of SGR 0501+4516
- Radio Detection of SGR 0501+4516: Retraction
- SGR 0501+4516: Decline in Activity
- SGR 0501+4516: Proximity to supernova remnant HB9
- Enhanced Swift-XRT position of SGR 0501+4516
- SGR 0501+4516: GMRT Radio Observation at 618 MHz
- GRB 080825B: pseudo-z= 0.83 from prompt emission spectrum
- Konus-Wind observation of GRB 080825B
- GRB 080825B: Swift-XRT team analysis
- SGR 0501+4516: Fermi GBM (formerly GLAST Burst Monitor) observations of three exceptionally intense outbursts
- Soft Gamma Repeater SGR 0501+4516: GBM Detection of multiple bursts
- GRB080825: Afterglow confirmation and redshift estimate
- Suzaku ToO Observation of SGR 0501+4516
- GRB 080825B - optical counterpart candidate
- SGR 0501+4516: radio pulsar searches with GBT and WSRT
- Konus-Wind observations of new SGR 0501+4516
- Radio Detection of SGR 0501+4516
- SGR 0501+4516: MDM Optical Observations
- GRB 080822B, Swift-BAT refined analysis
- SGR 0501+4516: Astrotel-Caucasus optical observations
- SGR 0501+4516: UKIRT detection of possible infra-red counterpart
- SGR 0501+4516: WSRT Radio Observations
- Trigger 321551: Continued Large Flaring of SGR 0501+4516
- GRB 080822B: MASTER optical observation
- New Soft Gamma Repeater 0501+4516 (GRB 080822): GLAST Burst Monitor detection
- SGR 0501+4516: optical observations
- Swift Trigger 321481: A Large Flare from SGR 0501+4516
- SGR 0501+4516: Swift-BAT refined analysis of the 3 discovery events
- Discovery of the Spin Period of the New Soft Gamma Repeater SGR 0501+4516
- GRB 080822B: Swift detection of a burst
- GRB 080822 (SGR 0501+4516): archival optical observations
- New Soft Gamma Repeater 0501+4516 was GRB 080822
- GRB080810 - optical observations
- GRB080810: optical observations
- Radio detection of GRB 080810 with the VLA
- GRB 080810: RTT150 optical observations
- GRB 080810: Konus-Wind and Swift/BAT joint spectral analysis
- GLAST Burst Monitor detection of GRB 080810
- GRB 080810: Liverpool and Faulkes North observations
- GRB080810: MITSuME optical observation
- First GLAST Burst Monitor GRB Circulars
- GRB 080810: Swift/UVOT Refined Analysis
- GRB 080810: optical observations
- GRB 080810: Liverpool Telescope observations
- GRB 080810: D50 optical observation
- GRB 080810: Kanazawa optical observation
- GRB 080810: OSN follow-up
- GRB 080810: Observations from NOT
- GRB 080810: RTT150 optical observations
- GRB 080810: Swift-XRT Team refined analysis
- GRB 080810: KANATA optical-NIR observation, update
- GRB 080810: ROTSE-III Prompt Detection of Optical Counterpart
- GRB 080810: Keck/HIRES Spectroscopy
- GRB 080810, Swift-BAT refined analysis
- GRB 080810 : optical observation with KANATA
- GRB 080723B: GROND upper limits
- GRB 080723B: XMM-Newton observation
- GRB 080805: VLT redshift update
- GRB 080805: Faulkes Telescope South optical observations
- GRB 080804: GROND observations
- GRB 080727B: Late VLT imaging
- GRB 080804: ATCA Radio Observations
- GRB 080805: Swift-XRT Refined Analysis
- GRB 080805: Swift/UVOT Upper Limits
- GRB 080804: Swift-XRT Refined Analysis
- GRB 080804: Swift/UVOT Refined Analysis
- GRB 080805, Swift-BAT refined analysis
- GRB 080804, Swift-BAT refined analysis
- GRB080804: Gemini South redshift confirmation
- GRB 080804: Faulkes Telescope South observations
- GRB 080805: VLT redshift
- GRB 080805: Afterglow confirmation
- GRB 080805: GROND detection of possible afterglow