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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"

21769 results found.

  1. GRB980703 optical photometry
  2. GRB 980703: BATSE Observations
  3. GRB980703 optical observations
  4. GRB980703: Radio transient
  5. GRB980703 Transient Optical Follow-Up
  6. GRB980703: LOTIS observation at early times
  7. GRB980613 Optical Observations
  8. GRB 980703
  9. BeppoSAX NFI observations of GRB 980703
  10. GRB980703 optical followup
  11. Radio observations of SGRs
  12. SGR1900+14 field optical observations
  13. GRB 980613: Optical transient and its host galaxy
  14. SGR1627-41, RXTE/ASM observations
  15. GRB 980613: Detection of the probable host galaxy
  16. GRB 980613 Optical Observations
  17. GRB 980613 optical observations
  18. Discovery of a new SGR source, SGR1627-41
  19. GRB980613 Optical Observations
  20. GRB980613 observations from Palomar
  21. GRB980613 Near Infra-Red Observations
  22. GRB980613, BeppoSAX WFC positions
  23. GRB971214 Secondary Standards
  24. GRB980519 Secondary Standards
  25. GRB 980519 Optical Observations
  26. GRB 980519
  27. GRB980519 optical observations
  28. GRB 980519 Optical Observations
  29. GRB980519 BATSE Observations
  30. GRB970519, optical follow-up at Schmidt Calern
  31. GRB980519 Optical Observations
  32. GRB 980519 Optical Observations
  33. GRB980515, BeppoSAX IAUC to be submitted
  34. GRB980519, BeppoSAX-WFC position
  35. BeppoSAX GRB ALERT: updated position of grb980515
  36. GRB 980425 Brightness Temperature
  37. BSAX Observations of GRB980425 field
  38. SAX J0840.7+2248 Optical Observations
  39. GRB980425: optical obs.
  40. GRB980425: Radio Observations
  41. report on BSAX observations of GRB980425
  42. GRB980326 X-ray Observations
  43. GRB980326, optical observations
  44. GRB980326, optical observations
  45. GRB980329 Keck K-band observations
  46. GRB980329 sub-millimeter observations
  47. GRB980326 optical observations
  48. GRB980329 optical observations
  49. GRB980329 VLA observations
  50. GRB980329 optical observations
  51. GRB980326 optical observations
  52. Optical Observations of GRB 970508
  53. GRB 971214: Redshift from Keck Observations
  54. Near-IR follow-up on GRB 971227
  55. Optical Observations of the GRB 971227 field
  56. Optical Observations on GRB 971227
  57. GRB971227: Plaskett R-band observations
  58. GRB 971227: Optical clarifications
  59. GRB971227: Further CAHA R-band images
  60. GRB971227: LOTIS observations
  61. GRB971214: Optical Observations and Calibrations
  62. Sub-millimeter Observations of GRB 971214 at the JCMT
  63. GRB 971214: KPNO Optical Observations
  64. Optical Observations of GRB 971214 at Keck
  65. GRB 971214: Optical Observations
  66. Radio Observations of GRB 971214 at the VLA
  67. GRB 971024: KPNO Optical Observations
  68. RXTE Observations of SGR 1814-13
  69. GRB 970828: Palomar Observations

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