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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"

12089 results found.

  1. BATSE Observations of GRB000115
  2. GCN resumes full operations
  3. Chandra observation of the X-ray afterglow of GRB991216
  4. GRB 991216 Optical spectroscopy/imaging
  5. GRB 991216 Optical Observation
  6. GRB 991216: Extremely bright BATSE burst
  7. IPN localization of GRB991208
  8. GRB 991105: BATSE Observations
  9. GRB 991014 - X-ray afterglow identification by BeppoSAX-NFI
  10. GRB 990915 optical observations
  11. BATSE GRB trigger criteria
  12. GRB990907: BeppoSAX follow up and X-ray afterglow
  13. GRB990806: BATSE Observations
  14. GRB 990705, R-band observations
  15. Infrared and Optical Observations of GRB990705
  16. GRB990704
  17. Refined BeppoSAX-WFC position of GRB990704
  18. GRB990704: BeppoSAX detection
  19. IPN error box for GRB990527
  20. Late Afterglows of GRBs 990510, 990123
  21. X-ray/GRB 1SAX J0835.9+5118, TNG V and R observations
  22. X-ray/GRB 1SAX J0835.9+5118, BATSE Observation
  23. optical observation of the X-ray/GRB transient SAX J0835.9+5118
  24. BeppoSAX: A new fast X-ray transient
  25. VLT spectrum of GRB990510
  26. GRB 990510: BATSE Observations
  27. GRB990510
  28. GRB 990506: BATSE Observations
  29. GRB 990506, optical observations
  30. GRB990506 Optical observations
  31. New IPN/RXTE error box for GRB990506
  32. GRB 970228: Redshift and properties of the host galaxy
  33. GRB980425 Optical observations of exponential decline at late time
  34. GRB990323 PRECISE IPN POSITION
  35. GRB990321 IPN TRIANGULATION
  36. GRB990308 not a new SGR
  37. GRB990308, Possible new SGR~0209+70
  38. GRB 981220, radio observations
  39. BATSE Flight Anomaly
  40. Optical Observations of GRB990217
  41. GRB 990123: Continued Radio Observations
  42. Search for Potential Images of GRB 990123
  43. "GRB 990123: New BV Observations"
  44. GRB 990123: BATSE Observations
  45. GRB990123 Optical Observation
  46. GRB990123, BeppoSAX-NFI X-ray afterglow detection
  47. GRB 980613: Spectroscopy of the host galaxy
  48. GRB 981226 optical observations
  49. GRB981226, BeppoSAX-NFI follow-up
  50. GRB 981220: BeppoSAX/GRBM results
  51. GRB 981220: RXTE/ASM and BeppoSAX/GRBM results
  52. GRB 980923 BATSE Observations
  53. SGR1900+14, BeppoSAX-GRBM observations
  54. GRB980703 optical photometry
  55. GRB 980703: BATSE Observations
  56. GRB980703: LOTIS observation at early times
  57. GRB980519 observation report
  58. GRB980703 optical followup
  59. SGR1627-41
  60. Radio observations of SGRs
  61. SGR1627-41, RXTE/ASM observations
  62. Reduced error box of SGR 1627-41
  63. GRB 980613: BATSE Observations
  64. SGR 1627-41
  65. Discovery of a new SGR source, SGR1627-41
  66. SGR 1900+14
  67. SGR1900+14
  68. SGR1900+14
  69. BATSE on-board GRB trigger change
  70. GRB 980519 Optical Observations
  71. GRB980519 BATSE Observations
  72. GRB970519, optical follow-up at Schmidt Calern
  73. GRB980519 optical observations
  74. GRB 980519 Optical Observations
  75. GRB980519, BeppoSAX-WFC updated position
  76. GRB980519, BeppoSAX-WFC position
  77. GRB 980425 Radio Light Curve
  78. GRB980425 BATSE observations
  79. GRB 980329 ROSAT observation
  80. GRB980329 optical observations
  81. GRB980329 optical observations
  82. GRB980329 optical observations
  83. GRB 971227: Optical Observations
  84. GRB971227: LOTIS observations
  85. GRB 971214: EUVE Observations
  86. GRB 971024: USNO Observations
  87. IRAS 18119-1342 and the possible new SGR
  88. Possible new SGR from US Naval Observatory
  89. RXTE Observations of SGR 1814-13

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