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"35436 results found.
- GRB 080121 position was incorrect
- GRB 080121: Enhanced Swift-XRT position
- IPN triangulation of GRB080122
- GRB 080121: Nearby SDSS galaxies
- GRB 080121: Swift-BAT detection of a very weak, short burst
- GRB 080123: Swift-XRT refined analysis
- GRB 080123: Swift/UVOT refined analysis
- X-ray transient in NGC 2770: RTT150 optical observations
- GRB 080123, Swift-BAT refined analysis
- GRB 080123: Enhanced Swift-XRT position
- GRB 080123: Swift detection of a short burst
- GRB 080120: GROND confirmation of the optical afterglow
- VLA radio upper limit on GRB 080120
- GRB 080120: Swift-XRT refined analysis
- GRB 080120: GROND detection
- GRB 080120 : Planned XMM-Newton observation
- GRB080120: Swift XRT position
- GRB 080120: a long GRB detected by INTEGRAL
- XRF 080109 / SN 2008D: spectroscopic evolution
- Swift observations of the X-ray transient in NGC 2770 (aka SN2008D)
- XRB 080109/SN 2008D: Early decline in brightness and change in colors
- XRF 080109 in NGC2770: Detectable Superluminal Motion
- Detailed Spectroscopic ID of SN 2008D (Transient in NGC 2770)
- Transient in NGC 2770: spectroscopic evidence for a SN
- Bright X-ray transient / possible XRF in NGC 2770: TNG R imaging
- GRB 071227: Suzaku WAM observation of the prompt emission
- GRB 071227: optical afterglow
- Further Swift-BAT analysis of GRB 071227
- Konus-Wind observation of GRB 071227
- GRB 071227: Magellan redshift confirmation
- GRB 071227: Swift-XRT refined analysis
- GRB 071227: VLT probable redshift of the candidate host galaxy
- GRB 071227: Magellan observations
- GRB 071227: REM NIR and Optical observations
- Swift-BAT refined analysis of short GRB 071227
- GRB 071227: Swift detection of a burst
- GRB071020: optical observations
- GRB 070429B: Possible UVOT Detection of an Optical Afterglow
- Swift-BAT trigger 298308 is not a GRB
- GRB 071208?: Swift detection of a possible burst
- IBAS Alert #4772 in not a GRB
- GRB 071125: Suzaku WAM observation of the prompt emission
- GRB 070429B: Probable host galaxy and redshift
- GRB 071129, Swift-BAT refined analysis
- GRB 071129: Swift detection of a burst
- Konus-Wind and Konus-A observations of GRB 071125
- IPN triangulation of very bright GRB 071125
- GRB 071112C: Optical/NIR observations
- Disregard the "GRB 071126" position
- GRB 071126: Enhanced Swift-XRT position
- VLA radio detection of GRB 071122
- GRB071122: Swift/UVOT Observations
- GRB071104: NIR Afterglow Candidate at TNG
- GRB 071122: MASTER optical observation
- GRB 071122, Swift-BAT refined analysis
- GRB 071122 Swift XRT position update sent in error.
- GRB 071122 Swift-XRT refined analysis
- GRB 071122: Corrected P60 Coordinates
- GRB071122: Gemini Absorption redshift
- GRB 071122: P60 Optical Afterglow Candidate
- GRB 071122: ROTSE-III Optical Limits
- GRB 071122: Swift detection of a burst
- GRB 071118: P60 Observations
- GRB071118 MITSuME OAO optical observation
- GRB 071118: Observations from OSN
- GRB 071117: VLT observations and probable redshift
- Swift/UVOT observations of GRB071118
- GRB 071117: Swift-XRT revised position
- Konus-Wind and Konus-A observations of GRB 071117
- Swift XRT follow-up observations of GRB071008
- Swift/UVOT upper limits for GRB 071117
- GRB071118: Swift XRT refined analysis
- GRB 071117: Gemini Optical Afterglow Discovery
- GRB 071118, Swift-BAT refined analysis
- GRB 071117: TAROT La Silla observatory optical observations
- GRB 071112B: Gemini Image Differencing
- GRB 071118: Swift detection of a burst
- GRB 071117: Gemini Observations
- GRB 071117: Las Campanas optical observations
- GRB 071117: Swift-XRT refined analysis
- GRB 071117, Swift-BAT refined analysis
- VLT FORS2 observations of short hard GRB071112B
- GRB 071117: Swift/XRT position
- GRB 071117: Initial Swift/UVOT observations
- GRB 071117: Swift detection of a bright burst
- VLA radio upper limit on GRB 071112C
- ATCA radio observations of short hard burst GRB 071112B
- GRB 071112C: Optical and NIR data observed with KANATA
- GRB 071112C: WSRT Radio Observations
- GRB 071112C: optical observation
- GRB 071112C: optical observation
- GRB 071112C: emission lines and refined VLT redshift
- GRB 071112C MITSuME Akeno early optical observation
- GRB 071112C: Gemini Absorption Redshift
- GRB 071112B: 2nd epoch of Magellan i-band imaging
- GRB 071112C: SARA upper limit
- GRB 071112C : Second Epoch Lulin R-band observations
- GRB071112C MITSuME Okayama Optical Observation
- GRB 071112C: Swift-BAT refined analysis
- GRB 071112C: Swift/UVOT observations