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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"

36681 results found.

  1. GRB971214 Secondary Standards
  2. GRB980519 Secondary Standards
  3. BATSE on-board GRB trigger change
  4. GRB 980519 Optical Observations
  5. GRB980519 optical observations
  6. GRB 980519
  7. GRB980519 optical observations
  8. GRB 980519 Optical Observations
  9. GRB980519 BATSE Observations
  10. GRB970519, optical follow-up at Schmidt Calern
  11. GRB980519 optical observations
  12. GRB980519 Optical Observations
  13. GRB980519 Optical Observations
  14. GRB980519 IPN POSITION
  15. GRB980519 Optical Observations
  16. GRB 980519 Optical Observations
  17. GRB980519 optical observations
  18. GRB980515, BeppoSAX IAUC to be submitted
  19. BATSE on-board GRB trigger change
  20. BeppoSAX GRB ALERT: updated position of grb980515
  21. GRB 980425 Radio Light Curve
  22. GRB 980425 Brightness Temperature
  23. GRB980425 BATSE observations
  24. SAX J0840.7+2248 Optical Observations
  25. GRB 980425 optical observations
  26. GRB980425: optical obs.
  27. GRB980425: Radio Observations
  28. GRB 980425 optical observations
  29. GRB 980425 optical observations
  30. GRB 980329 ROSAT observation
  31. GRB980326 X-ray Observations
  32. GRB980326, optical observations
  33. GRB980326, optical observations
  34. GRB980329, Fading IR counterpart to radio source
  35. GRByymmdd, Announcement of automation
  36. GRB980326 IPN annulus
  37. GRB980329 sub-millimeter observations
  38. GRB980329 IPN annulus
  39. GRB980329 near-IR observations
  40. GRB980326 optical observations
  41. GRB980329 optical observations
  42. GRB980329 VLA observations
  43. GRB980329 near IR observations
  44. GRB980329 optical observations
  45. GRB980329 optical observations
  46. GRB980326 optical observations
  47. GRB980326 optical observations
  48. GRB970508 SAO RAS optical observations
  49. Optical Observations of GRB 970508
  50. GRB 971214: Redshift from Keck Observations
  51. Near-IR follow-up on GRB 971227
  52. GRB971214: Keck R & I-band Observations
  53. GRB 971227: Optical Observations
  54. Optical Observations of the GRB 971227 field
  55. Optical Observations on GRB 971227
  56. GRB971227: Plaskett R-band observations
  57. GRB 971227: Optical clarifications
  58. Optical Observations for GRB 971227
  59. GRB971227: Further CAHA R-band images
  60. GRB971227: LOTIS observations
  61. GRB 971227: CAHA R-band images
  62. GRB 971227: Optical observations
  63. Sub-millimeter Observations of GRB 971214 at the JCMT
  64. GRB 971214: EUVE Observations
  65. GRB 971214: Redshift from Keck Optical Observations
  66. GRB 971214: Redshift from Keck Optical Observations
  67. GRB 971214: Apache Point Observatory Optical Observations
  68. GRB 971214: KPNO Optical Observations
  69. Optical Observations of GRB 971214 at Keck
  70. GRB 971214: Optical Observations
  71. Radio Observations of GRB 971214 at the VLA
  72. GRB 971214: USNOFS Observations Summary
  73. GRB 971024: KPNO Optical Observations Summary
  74. GRB 971024: Refined analysis by USNOFS Observations
  75. GRB 971024: KPNO Optical Observations
  76. GRB 971024: USNO Observations
  77. GRB 970925: BATSE Localization
  78. IRAS 18119-1342 and the possible new SGR
  79. Possible new SGR from US Naval Observatory
  80. GRB 970828: Palomar Observations
  81. GRB 970228: Keck/LRIS Optical Observations

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