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"28083 results found.
- GRB 070621: Gemini South optical imaging
- GRB 070621: UVOT-enhanced XRT position
- Observations of GRB070612A at Calar Alto
- GRB 070621: NOT observations
- GRB070621: OPTIMA-Burst optical upper limit
- GRB 070621: TAROT Calern observatory optical observations
- GRB 070621: Watcher Observations
- GRB 070621: Swift detection of a burst
- GMRT upper limit of GRB 070610/SWIFT J195509.6+261406 in 610 MHz
- Swift/UVOT detection of GRB070616 optical afterglow.
- GRB 070612A: NOT observations
- GRB070616: Optical Observation by MITSuME Okayama
- GRB 070616, Swift-BAT further refined analysis
- GRB 070616: BTA optical observations
- GRB 070616: TLS observation
- Swift XRT observations of the INTEGRAL burst GRB070615: Possible
- GRB 070616: Swift detection of a burst
- GRB 070612B: optical observations
- UVOT Observations of INTEGRAL burst GRB070615
- VLA upper limit on GRB 070610
- GRB 070615
- SWIFT J195509.6+261406 (GRB 070610): further observations
- GRB 070612A: Super-LOTIS observations
- GRB 070612A: Rapid Decay
- GRB 070612A: Suzaku/WAM observation of the prompt emission
- SWIFT J195509.6+261406 / GRB 070610: OPTIMA-Burst observations
- GRB070612A: MITSuME Okayama Observation
- GRB 070612A: continued SARA observations
- GRB 070611: Watcher Observations
- Swift Trigger 282176 is Cygnus X-1
- GRB 070612A: P60 Confirmation of Afterglow and An Underlying, Nearby
- GRB 070612B: SARA upper limit
- GRB 070612B, Swift-BAT refined analysis
- GRB 070612A, Swift-BAT refined analysis
- SWIFT J195509.6+261406 / GRB 070610: SWIFT continued observations
- GRB 070612B: Swift/UVOT upper limits
- GRB 070612B: FRAM limit
- GRB070612B: P60 Observations
- GRB 070612A: SARA detection of possible OT
- GRB 070610: TAROT Calern observatory optical observations
- GRB 070610: MITSuME OAO optical upper limit
- GRB070612 - SDSS Pre-Burst Observations
- GRB 070612: Swift detection of a burst
- GRB 070610: OPTIMA-Burst detection of continued strong flaring activity
- GRB 070610: SARA upper limit
- GRB 070610: Swift-XRT refined analysis
- GRB 070611: Swift/UVOT Observations
- GRB 070611: Swift-XRT refined analysis
- GRB 070611, Swift-BAT refined analysis
- GRB 070610: Optical observations from OSN
- GRB 070610: Watcher Observations
- GRB 070611: ROTSE-III Detection of Late Rising Optical Counterpart
- GRB 070611: ROTSE-III Optical Limits
- GRB 070610: Swift-UVOT Upper Limits
- GRB 070610: OPTIMA-Burst high-time-resolution optical observations
- GRB 070610, Swift-BAT refined analysis
- GRB 070412: TAROT Calern observatory optical observations
- GRB 070411: TAROT Calern observatory optical observations
- GRB070520B: optical observations
- GRB070520: optical observation
- GRB070518: optical observation
- GRB070521: optical observation
- GRB 070531: NOT nIR observations
- GRB 070531: Swift-BAT refined analysis
- GRB 070531: I-band observations from IAC80
- GRB 070531: Liverpool Telescope Optical Observations
- GRB 070529: SARA upper limit
- Swift/UVOT refined analysis of GRB070529
- GRB 070529: Optical aterglow from MIRO
- GRB 070529: Swift-XRT refined analysis
- GRB 070529, Swift-BAT refined analysis
- GRB 070529: Xinglong TNT Optical Upper Limit
- GRB 070529: Swift detection of a burst with an optical aterglow
- GRB 070412: Deep Keck imaging
- Swift trigger 280447 is probably a Galactic transient
- GRB 070518, deep LBT photometry
- Konus-Wind observation of GRB 070521
- GRB070521: Second Epoch Gemini Imaging
- GRB 070521: Swift/UVOT Upper Limits
- GRB 070521, optical observation
- GRB 070521: Swift-XRT refined analysis
- GRB 070521: Keck imaging
- GRB070521: Gemini Observations
- GROND upper limits of GRB 070521
- GRB 070520B: SARA upper limit
- GRB 070520A: SARA upper limit
- GRB 070521: SARA upper limit
- GRB 070521: Subaru observations and possible host detection
- GRB 070520B: Swift/UVOT Upper Limits
- GRB 070520A: Subaru Observations
- GRB 070521, Swift-BAT refined analysis
- GRB 070520A: Swift UVOT Upper Limits
- GRB 070520B: Swift-XRT refined analysis
- GRB 070521: TAROT La Silla observatory optical observations
- GRB070521 - SDSS Pre-Burst Observations
- GRB 070521: Swift detection of a burst
- GRB 070520A: MITSuME Akeno optical upper limits
- GRB 070520B, Swift-BAT refined analysis
- GRB 070520A, Swift-BAT refined analysis
- GRB 070520A: Swift-XRT refined analysis