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.
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"20540 results found.
- GMRT Radio detection of GRB 171205A
- GRB 171216A: Swift/UVOT Upper Limits
- GRB 171210A: Further Swift-XRT observations
- GRB 171205A: RATAN observations
- Swift Trigger 797070: KAIT Optical Observations
- Swift Trigger 797070 is probably not a GRB
- GRB 171205A: ALMA observations
- GRB 171212A/Swift J1935.7+2036: Swift/UVOT Upper Limits
- GRB 171212A/Swift J1935.7+2036: TSHAO optical observations
- GRB 171205A: JCMT SCUBA-2 sub-mm observations
- GRB 171211A: Swift/UVOT Upper Limits
- GRB 171210A: MASTER-Net optical observations
- GRB 171209A: MASTER-Net optical observations
- GRB 171210A: Swift-XRT and UVOT observations
- GRB 171210A: Swift ToO observations
- GRB 171209A: Lulin 1m telescope observations
- GRB 171205A: iTelescope optical observations
- GRB 171205A: Mondy optical observations
- GRB 171205A: SAO-RAS optical observations
- GMRT upper limit on GRB 171205A
- GRB 171209A: Swift/UVOT Analysis of the burst
- Swift Trigger 796115 is probably not a GRB
- GRB 171205A: VLA detection
- GRB 171205A: UKIRT near-IR observations
- GRB 171209A: LCO 1-m telescope observations
- Swift Trigger 796098 is probably a noise peak near M31
- LIGO/Virgo GW170817: X-ray observations confirm prediction made from radio data
- LIGO/Virgo GW170817: Further Hubble Space Telescope observations
- LIGO/Virgo G298048: Brightening X-ray Emission from GW170817/GRB170817A/SSS17a
- GRB 171205A: TSHAO optical observations
- LIGO/Virgo GW170817: Chandra X-ray brightening of the counterpart 108 days since merger
- GRB 171205A: Continued Swift/UVOT Observations
- LIGO/Virgo G298048: Late-time detection of the X-ray afterglow with Chandra
- GRB 171205A: MASTER-SAAO optical observations of unusual OT
- GRB 171205A: GROND observations of the optical/NIR transient
- GRB 171205A: LCO 1-m telescope observations
- GRB171205A hyperluminal radio afterglow?
- GRB 171205A: GMG observations (2nd night)
- GRB 171205A: Host galaxy photometric properties
- GRB 171205A: CHILESCOPE optical observations
- GRB 171205A: SMARTS optical/IR afterglow observations
- GRB 171205A: GOTO detection of the optical counterpart
- GRB 171205A: TNG NIR detections
- GRB 171205A: LSGT optical afterglow follow-up observation
- GRB 171205A: NOEMA detection of a bright mm afterglow
- GRB 171205A: GMG observation
- GRB 171205A: RATIR Optical and NIR Observations
- GRB 171205A: Swift/UVOT Detection
- GRB 171205A: VLT/X-shooter optical counterpart and spectroscopic observations
- GRB 171205A: Likely association with low-z spiral galaxy
- GRB 171124A: TShAO optical observations
- GRB 171124A: Swift-XRT afterglow detection
- Pan-STARRS follow-up of IceCube-171106A
- LIGO/Virgo G299232: LOFAR follow-up
- INTEGRAL pointed follow-up of IceCube-171106A
- GRB 171123A: OSN Upper Limit
- GRB 171124A: Swift-XRT observations
- GRB 171123A: Tautenburg observations
- GRB 171123A: RATIR Optical and NIR Observations
- GRB 171123A: Swift/UVOT Upper Limits
- GRB 171123A: GMG observation limit
- GRB 171124A: Swift ToO observations
- GRB 171123A: Confirmation of the X-ray afterglow
- GRB 171120A: Swift/UVOT Upper Limits
- Fermi-LAT Gamma-ray Observations of IceCube-171106A
- GRB 171115A: RATIR Optical and NIR Observations
- FACT follow-up of IceCube20171106
- IceCube-171106A: Swift Observations
- GRB 171010A: afterglow and SN 2017htp optical observations
- GRB 171030A: MASTER OT J034412.48-263556.5 featureless continuum spectrum from Lijiang 2.4m (China) telescope and 2m the Himalayan Chandra
- GRB 171010A: possible SN component
- AMON ICECUBE EHE 130214 (close by time to Fermi trigger): MASTER early follow-up observations
- GRB 171030A: MASTER inspection of the IPN error box of the short GRB.
- GRB 171010A: VLT spectroscopic identification of the associated SN 2017htp
- GRB 171102B: RATIR Optical and NIR Observations
- GRB 171102B: Swift/UVOT Upper Limits
- GRB 171030A: Swift non-localization with BAT, XRT and UVOT
- GRB 171030A: Swift ToO observations
- Swift Trigger 783893: KAIT Optical Observations
- GRB 171027A: KAIT Optical Upper Limit
- AMI-LA observations of the new Be X-ray binary Swift J0243.6+6124
- Swift Trigger 783893: LCO 1-m telescope observations
- GRB 171027A: Swift/UVOT Upper Limits
- GRB 171027A: VLT optical upper limits
- GRB 171027A: LCO 1-m telescope observations
- GROND observations of GRB 171027A: correction
- GRB 171027A: RATIR Detection of a NIR Afterglow Candidate
- GROND observations of GRB 171027A
- GRB 171027A: MASTER-OAFA (Argentina) early prompt optical observations
- Swift trigger 781740: Further analysis from Swift and Fermi/GBM
- Swift Trigger 781740 is not a burst
- Fermi GBM Observations of IceCube-171015A
- GRB 171020A: Continued RATIR Optical and NIR Observation
- GRB 171020A: TAROT Calern observatory optical observations
- GRB 171020A: Swift/UVOT Upper Limits
- GRB 171020A: RATIR Optical and NIR Observations
- GRB 171020A: LT observations
- GRB 171020A: NOT optical afterglow detection
- Swift Trigger on AXP CXOU J164710.2-455216/PSR J1647-4552
- GRB 171010B: Swift-XRT afterglow detection