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"3039 results found.
- GRB 080319B: Gemini-South photometry
- GRB 080320 - SDSS Pre-Burst Observations
- GRB 080319D: MASTER-VWF-Kislovodsk optical observation
- GRB 080319C: MASTER-VWF-Kislovodsk optical observation
- GRB 080319b light curve by Pi-of-the-Sky
- GRB 080319b prompt optical observation by Pi-of-the-Sky
- Swift Trigger 306616 is not a GRB
- GRB080310: Optical observation by MITSuME telescope
- GRB080229, optical upper limit
- GRB080307: Optical upper limits
- GRB 080218B, Swift-BAT refined analysis
- GRB 080218B: Swift detection of a burst
- GRB 080212, Swift-BAT refined analysis
- GRB 080210: Super-LOTIS observations
- GRB 080207, Swift-BAT refined analysis
- GRB 080207, Swift-BAT refined analysis
- GRB 080205: Swift detection of a burst
- GRB 080123: Early afterglow detection with BATSS (BAT Slew Survey)
- GRB 080123 : Suzaku WAM observation of the prompt emission
- GRB 080123: Swift detection of a short burst
- Swift-BAT refined analysis of short GRB 071227
- GRB 071227: Swift detection of a burst
- GRB 071122: MASTER optical observation
- GRB 071118: Swift detection of a burst
- Correction to the Swift-BAT Transient Identification (trigger=296683)
- GRB071112C: Errata of MITSuME Ic band photometry
- GRB071112C MITSuME Okayama Optical Observation
- GRB 071112C: Swift detection of a burst with an optical counterpart
- GRB071101: Optical and NIR upper limits by KANATA
- GRB071028: Xinglong EST V-band upper limit
- GRB071021: MARGE Optical Limits
- GRB071020, optical upper limit
- GRB071021: MITSuME Okayama Optical Upper Limits
- GRB 071018: Swift-XRT observation
- GRB 071011, Swift-BAT refined analysis
- GRB 071010B, Swift-BAT refined analysis
- GRB071008: Swift-XRT observation
- GRB 071003, Swift-BAT refined analysis
- GRB 071003: Swift detection of a bright burst
- Recent SGR1806-20 Activity
- GRB 070920B, Swift-BAT refined analysis
- GRB 070920: TAROT Calern observatory optical observations
- GRB 070911: Swift detection of a burst
- GRB070805 XRT and UVOT afterglow candidate
- GRB 070805, Swift-BAT refined analysis
- GRB 070724B: Swift-XRT afterglow confirmation
- GRB 070724B: Swift-XRT afterglow likely candidate
- GRB 070724B: Swift-XRT afterglow candidates
- Swift XRT observation of GRB 070707
- GRB 070704: Swift detection of a burst
- GRB 070628: NIR detection of afterglow
- OT20050728 was not an optical GRB afterglow
- GRB 070621: Gemini South optical imaging
- GRB 070616: BTA optical observations
- GRB 070610: OPTIMA-Burst detection of continued strong flaring activity
- GRB 070610: Watcher Observations
- GRB 070611: ROTSE-III Optical Limits
- GRB 070611: Swift detection of a burst
- GRB 070610: OPTIMA-Burst high-time-resolution optical observations
- GRB 070521, Swift-BAT refined analysis
- GRB 070521: optical limit by Pi of the Sky
- GRB 070518: Swift-XRT refined analysis
- GRB 070512: IPN localization and Konus spectrum of a bright burst
- GRB 070509: ROTSE-III Optical Limits
- GRB 070508, Swift-BAT refined analysis
- GRB 070427: Swift detection of a burst
- GRB 070420 Swift-BAT Refined Analysis
- GRB 070419A: MARGE Observations
- GRB 070411: Swift detection of a burst with optical afterglow
- GRB 070330, Swift-BAT refined analysis
- GRB 070330 - Watcher Observations
- Short-Hard GRB 070209: PROMPT Observations
- GRB 070318, Swift-BAT refined analysis
- GRB 070318: Swift detection of a burst with an optical afterglow
- GRB 070306: IR observations and candidate afterglow
- GRB 070306: Optical and IR observations with KANATA
- VLA observation of GRB 070223
- Konus-Wind and Konus-A observations of GRB 070220
- GRB 070220: MITSuME Okayama Optical Observation
- GRB070208 - SDSS Pre-Burst Observations
- GRB 070208: Early IR detection and afterglow astrometry
- GRB070208: Faulkes Telescope North Afterglow Identification
- GRB 070208: Swift detection of a burst
- GRB070129: MITSuME optical observation
- GRB 070129: Swift detection of a burst
- Swift-BAT trigger 257213 is a Galactic Center transient
- Trigger 255685: Swift detection of a possible burst
- GRB 070110: Swift detection of a burst with a possible optical afterglow
- Retractions of previous Swift-BAT triggers
- GRB 061217, Swift-BAT refined analysis
- GRB 061213: MASTER-VWF-Kislovodsk optical candidate
- GRB 060926: MASTER: discovery of the optical flare
- GRB 061126: Early Detection of the IR Afterglow
- GRB 061121: MDM Optical Decay
- GRB 061121: MDM Optical Observations
- GRB 061121: Swift detection of a bright burst with an optical counterpart
- GRB 061007: Third Epoch ATCA Radio Observations
- GRB 061021: Swift-XRT refined analysis
- GRB 061021: Swift/UVOT Observation
- GRB 061021, Swift-BAT refined analysis