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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').
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"

12054 results found.

  1. GRB 011030 I-band Observation
  2. Optical observation of SGR 1806-20 at the 6-m SAO telescope
  3. GRB010921, optical observations
  4. GRB000418: HST/STIS Second-epoch Observations
  5. GRB010214, optical observations
  6. SGR 1900+14, Chandra observations
  7. GRB 010222 - HEGRA GeV/TeV Observations
  8. GRB010220 optical obsercations
  9. Sub-millimeter Excess/GRB 010222
  10. GRB 010222
  11. GRB010220, Radio and Optical Observations
  12. GRB 010214: X-Ray afterglow
  13. Optical Observations of GRB 001018 at Keck
  14. GRB001120, optical observations
  15. GRB 001109: deep JHK upper limits
  16. GRB000630, Optical Observations
  17. GRB 000301C: Late-Time HST/STIS CCD Imaging of the field
  18. GRB000210, Radio Observations
  19. GRB 991208, radio observations
  20. GRB991216 radio observations
  21. GRB991106: BeppoSAX/BATSE results
  22. GRB 991014 - X-ray afterglow identification by BeppoSAX-NFI
  23. GRB991014 BATSE Observations
  24. Infrared and Optical Observations of GRB990705
  25. GRB 990506, optical observations
  26. ASM/IPN error box for GRB 990308 (BATSE #7457)
  27. GRB990123, Optical observation
  28. GRB 990123: Continued Radio Observations
  29. GRB 990123: near-infrared observations.
  30. GRB990123: NIR Observation
  31. GRB 990123: Pre-Burst Detection of an Apparent Host Galaxy
  32. GRB 990123, new radio source
  33. GRB 981226: radio variable
  34. GRB981220, Correction to GCN 179
  35. GRB981220, Optical Observations
  36. GRB 981220 Optical observations
  37. GRB980329 R,I flux calibration and R,I,K upper limits
  38. GRB980703 optical followup
  39. GRB980613, optical observations
  40. SGR1627-41, RXTE/ASM observations
  41. GRB 980613: Detection of the probable host galaxy
  42. GRB 980613 Optical Observations
  43. GRB 980613 optical observations
  44. GRB 980519 Optical Observations
  45. GRB980519 optical observations
  46. BSAX Observations of GRB980425 field
  47. report on BSAX observations of GRB980425
  48. GRB 980329 ROSAT observation
  49. GRB980326 X-ray Observations
  50. GRB980326, optical observations
  51. GRB980329, Fading IR counterpart to radio source
  52. Optical Observations on GRB 971227
  53. GRB 971227: Optical observations
  54. GRB 971214: EUVE Observations

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