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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"

24361 results found.

  1. GRB990123 Optical Observation
  2. GRB 990123: Bright New Source, Possible Optical Transient
  3. Possible identification of SN1999E with GRB980910
  4. Optical Observations of GRB 981220
  5. GRB981220
  6. GRB981220, Correction to GCN 179
  7. GRB 981220 Optical observations
  8. GRB 981226
  9. GRB 981220
  10. GRB 981220, radio observations
  11. GRB981226 Optical Observation
  12. GRB 981220: BeppoSAX/GRBM results
  13. GRB981220 I-band Observations
  14. GRB981220 Optical Observations
  15. GRB 981220
  16. GRB 980326/Host Galaxy
  17. GRB 981220: RXTE/ASM and BeppoSAX/GRBM results
  18. GRB 980923 BATSE Observations
  19. GRB970508 optical observations
  20. Optical Observations of the Host Galaxy of GRB 980519
  21. GRB980519, Optical Observations
  22. GRB980703 H-band Observations
  23. GRB980703: LOTIS observation at early times
  24. GRB 980703: ASM Position & Intensity
  25. GRB980519 observation report
  26. GRB980703 optical followup
  27. GRB980613, optical observations
  28. GRB 980613: BATSE Observations
  29. Discovery of a new SGR source, SGR1627-41
  30. GRB 980519 Optical Observations
  31. GRB 980519 Optical Observations
  32. GRB970519, optical follow-up at Schmidt Calern
  33. GRB980519 optical observations
  34. GRB980519 Optical Observations
  35. GRB980515, BeppoSAX IAUC to be submitted
  36. GRB980519, BeppoSAX-WFC updated position
  37. GRB 980425 Radio Light Curve
  38. GRB 980425 Brightness Temperature
  39. GRB 980329 ROSAT observation
  40. GRB980326, optical observations
  41. GRB980326, optical observations
  42. GRByymmdd, Announcement of automation
  43. GRB980329 sub-millimeter observations
  44. GRB980329 optical observations
  45. GRB980329 optical observations
  46. GRB980326 optical observations
  47. GRB980326 optical observations
  48. Optical Observations of GRB 970508
  49. GRB 971214: Redshift from Keck Observations
  50. Near-IR follow-up on GRB 971227
  51. Optical Observations of the GRB 971227 field
  52. Optical Observations on GRB 971227
  53. GRB 971214: Redshift from Keck Optical Observations
  54. GRB 971214: Redshift from Keck Optical Observations
  55. Optical Observations of GRB 971214 at Keck
  56. GRB 971214: USNOFS Observations Summary
  57. GRB 971024: Refined analysis by USNOFS Observations
  58. GRB 971024: USNO Observations
  59. GRB 970925: BATSE Localization
  60. IRAS 18119-1342 and the possible new SGR
  61. GRB 970828: Palomar Observations

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