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"12111 results found.
- GRB 070626: IPN localization and Konus spectrum of a bright long burst
- GRB 070628, Swift-BAT refined analysis
- GRB 070628: Watcher Observations
- Swift UVOT Observations of GRB 070628
- GRB 070628: Swift detection of a possible burst
- GRB 070612A: Second Epoch WSRT Radio Observations
- GRB 070621: Swift-BAT refined analysis
- GRB 070621: ROTSE-III Prompt Optical Limits
- GRB 070621: Swift detection of a burst
- Swift/UVOT observations of GRB070616
- GRB 070615: A long GRB detected by INTEGRAL
- SWIFT J195509.6+261406 (GRB 070610): further observations
- SWIFT J195509.6+261406 / GRB 070610: OPTIMA-Burst observations
- GRB 070612A, Swift-BAT refined analysis
- GRB 070612A: SARA detection of possible OT
- GRB 070612B: Swift detection of a burst
- GRB 070610: OPTIMA-Burst detection of continued strong flaring activity
- GRB 070610: Watcher Observations
- GRB 070611: ROTSE-III Optical Limits
- GRB 070610: OPTIMA-Burst high-time-resolution optical observations
- GRB 070610, Swift-BAT refined analysis
- GRB 070610: Swift detection of a burst
- GRB 070419A, deep LBT photometry and possible supernova detection
- GRB070520B: optical observations
- GRB070520: optical observation
- GRB070518: optical observation
- GRB070521: optical observation
- Swift/UVOT refined analysis of GRB070531
- GRB 070531: Swift-BAT refined analysis
- GRB 070531: Swift detection of a burst
- Swift/UVOT refined analysis of GRB070529
- GRB 070529: MARGE Observations
- Konus-Wind observation of GRB 070521
- GROND upper limits of GRB 070521
- GRB 070520A: SARA upper limit
- GRB 070521: SARA upper limit
- GRB 070521: optical limit by Pi of the Sky
- GRB 070521: Swift detection of a burst
- GRB 070520: Xinglong EST optical Upper Limit
- GRB 070517: Swift detection of a burst
- GRB 070512: IPN localization and Konus spectrum of a bright burst
- GRB070419A: optical observations
- Konus-Wind and Konus-A observation of GRB 070508
- RHESSI Spectrum of GRB070508
- GRB 070508: Suzaku/WAM observation of the prompt emission
- GRB 070509: ROTSE-III Optical Limits
- GRB 070508, Swift-BAT refined analysis
- GRB 070508: Optical observation limiting magnitude
- GRB 070508: Optical afterglow detection
- GRB 070508: Swift detection of an intense burst with an optical counterpart
- GRB 070429A: Swift XRT refined analysis
- GRB 070429B: Swift XRT refined analysis
- GRB 070429B: ROTSE-III Optical Limits
- GRB 070429: ROTSE-III Optical Limits
- GRB 070427, Swift-BAT Refined Analysis
- GRB 070420, SMARTS optical/IR afterglow observations
- Konus-Wind observation of GRB 070420
- GRB070420: Swift UVOT continuing observations
- GRB 070420: NIR and optical afterglow confirmed
- GRB 070419A: Early Super-LOTIS Observations
- GRB 070419A: SARA observations
- GRB 070419B optical afterglow candidate
- GRB 070419B: optical afterglow candidate
- GRB 070419A: ROTSE-III Optical Limits
- GRB 070419: Swift detection of a burst
- GRB 070318, SMARTS optical/IR afterglow observations
- GRB 070411: Swift/UVOT observations
- GRB 070411: Optical photometry at Crni Vrh
- GRB 070411, Swift-BAT refined analysis
- GRB 070411 : Liverpool Telescope Observations
- GRB 070411: Optical observations at Crni Vrh
- GRB 070411: ROTSE-III Detection of Optical Counterpart
- GRB 070411: Tautenburg RRM Afterglow Confirmation
- GRB 070411: Swift detection of a burst with optical afterglow
- GRB 070406: Swift XRT team further analysis
- Suzaku ToO observation of SGR 1806-20
- GRB 070406: Gemini South Imaging and XRT analysis
- GRB 070406: SARA upper limit
- GRB 070406: Xinglong TNT optical Upper Limit
- Konus-Wind and Konus-A observations of GRB 070402
- IPN triangulation of GRB070402
- INTEGRAL ToO Observation of SGR1806-20
- Konus-Wind observation of GRB 070328
- long burst from SGR 1806-20 detected on March 26
- GRB 070328: Swift/XRT Refined Analysis
- GRB 070328 : Suzaku ToO follow up starts
- Short-Hard GRB 070209: PROMPT Observations
- GRB 070311: a long GRB detected by INTEGRAL
- GRB 070125: Chandra X-ray Confirmation of Jet Break
- GRB 070309: A long GRB detected by INTEGRAL
- GRB 070306: XRT Team Refined Analysis
- GRB 070227: optical observations
- GRB 070227: optical observations
- GRB 070224: SARA upper limit
- GRB 070224, Swift-BAT refined analysis
- GRB 070224: MASTER-Net refind analysis
- GRB 070224: MASTER-VWF-Kislovodsk observations
- GRB 070224: MASTER observations
- GRB 070224: Swift detection of a burst
- GRB 070223: Optical observations