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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"

43608 results found.

  1. GRB 130327A: Swift detection of a burst
  2. report: GRB 130315A: Zadko observatory - Gingin optical observations
  3. GRB 130325A: Fermi GBM detection
  4. Konus-Wind observation of GRB 130320A
  5. IPN Triangulation of GRB 130320A (long/very bright)
  6. GRB 130305A: Gemini follow-up observations
  7. GRB 130315A: GROND afterglow candidate
  8. GRB 130305A: optical upper limit in Mondy observatory
  9. GRB 130315A: Swift/UVOT Upper Limits
  10. GRB 130313A: optical upper limit in CrAO
  11. GRB 130313A: optical upper limit in Mondy observatory
  12. GRB 130315A: SALT optical observations
  13. GRB130313A: GTC early optical limits
  14. GRB 130313A: 5.8 GHz VLA upper limit
  15. GRB 130315A: Swift-XRT refined Analysis
  16. Swift XRT observations of GRB 130310A
  17. GRB 130315A, Swift-BAT refined analysis
  18. GRB 130313A: Swift/UVOT Upper Limits
  19. GRB 130305A: PTF P48 optical upper limits
  20. GRB130315A BOOTES-3 optical limit
  21. GRB 130315A: Swift detection of a burst
  22. GRB 130310A : Suzaku WAM observation of the prompt emission
  23. GRB 130305A: TLS Tautenburg observations
  24. GRB 130313A: RATIR Optical and NIR Observations
  25. GRB 130313A: TNG optical observations
  26. GRB 130313A: Fading X-ray Afterglow
  27. Swift-BAT trigger 551030 is not astrophysical
  28. GRB 130215A: Detection of the SN with the 10.4m GTC
  29. GRB130313A: Optical observations from GTC
  30. GRB 130313A: NOT optical upper limit
  31. GRB 130313A: Swift-XRT refined Analysis
  32. GRB 130313A: simultaneous and follow-up optical observations at BOOTES-3 and BOOTES-4
  33. GRB 130313A: Weihai optical upper limit
  34. GRB 130313A: Swift-XRT detection of a possible X-ray afterglow
  35. GRB 130313A: Swift-BAT refined analysis
  36. GRB 130313A: Zadko observatory - Gingin optical observations
  37. GRB 130313A: MASTER-Net optical observations
  38. GRB 130313A: Swift detection of a short burst
  39. IPN Triangulation of GRB 130307A
  40. GRB 100424A: Keck host detection and VLT/X-shooter redshift
  41. Swift XRT RETRACTION of GRB 130310A afterglow detection
  42. GRB 130310A: optical observations
  43. Swift XRT observations of GRB 130310A
  44. GRB 130306A: Swift Detection of a Possible Afterglow
  45. GRB 130131B: host detection and redshift
  46. Konus-Wind observation of GRB 130310A
  47. IPN triangulation of GRB 130310A
  48. GRB 130310A: Fermi GBM detection
  49. GRB 130310A: Fermi-LAT detection and localization
  50. GRB 130306A: Swift-BAT refined analysis
  51. IPN triangulation of GRB 130228A
  52. GRB 130305A BAT refined circular
  53. GRB 130305A: Further Swift-XRT Observations
  54. Konus-Wind observation of GRB 130306A
  55. GRB 130305A: Optical Observations
  56. GRB 111123A: Keck-I host detection and VLT/X-shooter redshift
  57. GRB 130305A: Gemini-North upper limit
  58. GRB 130307A: Fermi GBM detection
  59. GRB 130306A: Fermi GBM observation
  60. GRB 130306A: MASTER-Net pre-Swift alert observation
  61. GRB 130305A: Swift/UVOT Upper Limit
  62. GRB 130305A: RATIR Observations
  63. GRB 130306A: Swift detection of a burst
  64. GRB 130305A: P60 Observations
  65. GRB 100615A: HST host detection and X-shooter redshift
  66. GRB 130305A: Swift/XRT detection of the afterglow
  67. Konus-Wind observation of GRB 130305A
  68. GRB 130305A: Fermi GBM observation
  69. GRB 130305A: Fermi LAT Detection
  70. Fermi GBM trigger 130301.638 is not GRB
  71. GBM trigger 383712005 (GRB 130228A?) : Possible high-energy photon emission in Fermi/LAT data
  72. GRB 130305A found in ground analysis of Swift/BAT data
  73. GRB 121128A: optical observations in Mondy observatory
  74. GRB 121128A: optical upper limit in Maidanak observatory
  75. GRB 130216A: Swift/UVOT Upper Limit
  76. GRB 130219A: Suzaku WAM observation of the prompt emission
  77. SGR 1806-20 outburst (trigger 549841), Swift-BAT refined analysis
  78. Trigger 549841: Swift detection of SGR1806-20
  79. Konus-Wind observation of GRB 130219A
  80. GRB 130216B: Suzaku WAM observation of the prompt emission
  81. GRB 130216A: possible radio counterpart is steady field source
  82. GRB 130216A: Swift/XRT observations
  83. IPN Triangulation of GRB 130219A
  84. GRB 130215A: Suzaku WAM observation of the prompt emission
  85. GRB 130215A: PTF P48 optical detection
  86. GRB 130219A: Fermi GBM detection
  87. GRB 130216B: Swift/XRT observations
  88. GRB 130216A: Further Swift-BAT refined analysis
  89. GRB 130216B: MASTER-Net early observation
  90. GRB 130216A: MASTER-Net early observations
  91. GRB 130215A: Continued RATIR Optical and NIR Monitoring
  92. GRB 130216A: Fermi GBM observation
  93. GRB 130216B: Fermi GBM observation
  94. GRB 130216A: possible early detection at 15 GHz
  95. GRB 130216B BAT refined analysis
  96. GRB 130216B: P200 NIR Observations
  97. GRB 130216A: P200 NIR Observations
  98. GRB 130216A: Swift-BAT refined analysis
  99. GRB 130216A: TAROT La Silla observatory optical observations
  100. GRB 130215A: Additional P200 NIR observations

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