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"24810 results found.
- Swift Trigger 701668 is probably not an astrophysical event
- IPN Triangulation of GRB 160620A (short/hard)
- GRB 160625A: Swift/UVOT Upper Limits
- GRB 160625A: Swift-BAT refined analysis
- GRB 160625A: Swift-XRT refined Analysis
- Trigger 701590: Swift detection of a bright outburst from SGR 1935+2154
- GRB 160625B: Swift/UVOT Detection
- GRB 160625B: RATIR Optical and NIR Afterglow Detection
- GRB 160625B: Fermi GBM refined analysis
- GRB 160625B: Fermi-LAT refined analysis
- GRB 160625B: Swift-XRT afterglow detection
- GRB 160625A: Enhanced Swift-XRT position
- GRB 160625B: Fermi GBM initial observations
- GRB 160625A: Swift-XRT observations
- GRB 160624A: Swift/UVOT Upper Limits
- GRB 160624A: Lulin observation
- GRB 160623A: TSHAO optical observations
- GRB 160624A: Swift-XRT refined Analysis
- GRB 160623A: MITSuME Ishigakijima Optical Observation
- GRB 160624A: MITSuME Ishigakijima upper limits
- GRB 160624A, Swift-BAT refined analysis
- GRB 160623A: Swift/UVOT Upper Limits
- GRB 160623A: RATIR Optical and NIR Observations, Afterglow Confirmation
- GRB 160624A: Enhanced Swift-XRT position
- GRB160624A:possible GRB host redshift
- GRB 160623A: Mondy optical observations
- GRB 160624A: Swift detection of a short burst
- GRB 160623A: Swift-XRT afterglow detection
- GROND observations of GRB 160622A/SNR RCW 103/SGR 1617-5103
- Trigger 701182: Swift detection of SGR 1935+2154
- GRB 160623A / Galactic transient: Fermi-LAT detection
- SGR 1617-5103 (BAT trigger 700791): Enhanced Swift-XRT position.
- BAT trigger 700791 (possible GRB 160622A) is SNR RCW 103
- GRB 160622A: Swift detection of a possible short GRB or a new SGR
- LIGO/Virgo G211117/GW151226: serendipitous XMM-Newton slew observations
- GRB 160612A: Swift-XRT observations
- IPN Triangulation of GRB 160612A (short/hard)
- GRB 160612A: Fermi GBM detection
- GRB 160611A: Swift/UVOT observations
- GRB 160611A: Swift-BAT refined analysis
- Swift Trigger 690738 is not an astrophysical event
- GRB 160611A: Swift-XRT refined Analysis
- GRB160611.9 MASTER-Net OT detection
- GRB 160611A: Enhanced Swift-XRT position
- GRB 160611A: Swift-XRT observations
- SWIFT J174540.2-290037, Swift-BAT refined analysis (trigger 690197)
- SWIFT J174540.2-290037, Swift-BAT refined analysis (trigger 689956)
- Trigger 689956: Swift detection of a source near the Galactic center
- GRB 160607A: Swift/UVOT Upper Limits
- GRB 160607A: GROND confirmation of the afterglow
- GRB 160607A: candidate optical afterglow from the NOT
- GRB 160607A: Swift-BAT refined analysis
- Trigger 689353 (possible transient near Sgr A*), Swift-BAT refined analysis
- GRB 160607A: Swift-XRT refined Analysis
- GRB 160607A: Enhanced Swift-XRT position
- GRB 160607A: Swift detection of a bright burst
- Trigger 689353: Swift detection of a transient near Sgr A*
- GRB 160601A: AbAO optical observations
- GRB 160601A: Swift/UVOT Upper Limits
- GRB 160601A: Swift-BAT refined analysis
- GRB160601A: Gemini Imaging
- GRB 160601A: GTC observations confirming transient source decay
- GRB 160601A: Mondy optical observations, photometry of NOT sources
- GRB160601A: NOT afterglow confirmation
- GRB 160601A: Swift-XRT refined Analysis
- GRB160601A: NOT detection of an afterglow candidate
- GRB 160601A: Enhanced Swift-XRT position
- GRB 160601A: Mondy optical observations
- GRB 160601A: MITSuME Okayama Ks-band upper-limit
- GRB 160530A: Swift follow-up and X-ray afterglow candidate
- GRB 160601A: MITSuME Okayama upper limits
- GRB 160601A: Swift detection of a short hard burst
- GRB 160530B: Fermi GBM Detection
- GRB 160530A: discovery with the Compton Spectrometer and Imager
- GRB 160525B: Mondy optical upper limit
- GRB 160525B: Khureltogot optical upper limit
- GRB 160525B: Swift-BAT refined analysis
- GRB 160525B: Swift-XRT refined Analysis
- GRB 160525B: Nanshan optical upper limit
- GRB 160525B: Swift/UVOT Detection
- GRB 160521B: Swift-XRT afterglow detection
- GRB 160525B: Enhanced Swift-XRT position
- GRB 160525A: Swift-BAT refined analysis
- GRB 160525B: Swift detection of a burst
- GRB 160525A: Swift detection of a probable burst
- GRB 160521B: Theoretical estimate of the redshift and urgent need for further x-ray observations
- GRB 160521B: Swift-XRT observations
- Another Swift detection of SGR 1935+2154 (trigger #687124)
- Swift detection of SGR 1935+2154
- GRB 160521B: Fermi GBM detection
- GRB 160521A: a long GRB detected by INTEGRAL
- GRB 160519A: Swift-BAT refined analysis
- GRB 160519A: Fermi GBM detection
- SGR 1935+2154: AbAO optical upper limit
- Trigger 686761: Swift detection of a bright burst from SGR 1935+2154
- Trigger 686443: Swift detection of SGR 1935+2154
- FACT follow-up of the IceCube event 160427A
- Interplanetary Network Search for IceCube 160427A
- GRB 160509A: CALET Gamma-Ray Burst Monitor detection
- GRB 160509A: non-observation of VHE emission with HAWC