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GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. 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"

27956 results found.

  1. GRB 130408A: Liverpool Telescope Optical candidate detection
  2. GRB 130408A: Swift detection of a burst
  3. GRB 130407A Tiled Swift observations
  4. GRB 130407A: MAXI/GSC detection
  5. GRB 130211A: Retraction of afterglow candidate
  6. GRB 130327B: Suzaku WAM observation of the prompt emission
  7. Swift detection of IGR J18245-2452
  8. IPN Triangulation of GRB 130320B (very long/bright)
  9. Swift/XRT observation of GRB 130327B
  10. GRB 130327A: RATIR Optical/NIR afterglow confirmation
  11. GRB 130306A: Confirmation of the X-ray Afterglow
  12. Swift Trigger 552142 is a noise event
  13. Konus-Wind observation of GRB 130327B
  14. GRB 130327B: Fermi-LAT detection of a burst
  15. GRB 130327B: Fermi GBM detection
  16. Swift Trigger 552142: a possible GRB
  17. GRB 130327B: gamma-ray detection by AGILE
  18. GRB 130327A: Swift-BAT refined analysis
  19. GRB 130327A: Swift-XRT refined Analysis
  20. GRB 130327A: Swift/UVOT Upper Limits
  21. Konus-Wind observation of GRB 130325A
  22. GRB 130327A: ISON-NM optical upper limit
  23. GRB 130325A Tiled Swift observations
  24. GRB 130327A: Enhanced Swift-XRT position
  25. GRB 130327A: PAIRITEL NIR Afterglow Candidate
  26. GRB 130325A: Fermi LAT detection
  27. GRB 130327A: Swift detection of a burst
  28. report: GRB 130315A: Zadko observatory - Gingin optical observations
  29. GRB 130325A: Fermi GBM detection
  30. GRB 130315A: GROND afterglow candidate
  31. GRB 130305A: optical upper limit in Mondy observatory
  32. GRB 130315A: Swift/UVOT Upper Limits
  33. GRB 130313A: optical upper limit in CrAO
  34. GRB 130313A: optical upper limit in Mondy observatory
  35. GRB 130315A: SALT optical observations
  36. GRB 130315A: Swift-XRT refined Analysis
  37. Swift XRT observations of GRB 130310A
  38. GRB 130315A, Swift-BAT refined analysis
  39. GRB 130313A: Swift/UVOT Upper Limits
  40. GRB 130305A: PTF P48 optical upper limits
  41. GRB130315A BOOTES-3 optical limit
  42. GRB 130315A: Swift detection of a burst
  43. GRB 130310A : Suzaku WAM observation of the prompt emission
  44. GRB 130305A: TLS Tautenburg observations
  45. GRB 130313A: RATIR Optical and NIR Observations
  46. GRB 130313A: Swift-BAT Spectral lag analysis
  47. GRB 130313A: Fading X-ray Afterglow
  48. Swift-BAT trigger 551030 is not astrophysical
  49. GRB 130215A: Detection of the SN with the 10.4m GTC
  50. GRB 130313A: Swift-XRT refined Analysis
  51. GRB 130313A: simultaneous and follow-up optical observations at BOOTES-3 and BOOTES-4
  52. GRB 130313A: Swift-XRT detection of a possible X-ray afterglow
  53. GRB 130313A: Swift-BAT refined analysis
  54. GRB 130313A: Zadko observatory - Gingin optical observations
  55. GRB 130313A: MASTER-Net optical observations
  56. GRB 130313A: Swift detection of a short burst
  57. IPN Triangulation of GRB 130307A
  58. GRB 100424A: Keck host detection and VLT/X-shooter redshift
  59. Swift XRT RETRACTION of GRB 130310A afterglow detection
  60. Swift XRT observations of GRB 130310A
  61. GRB 130306A: Swift Detection of a Possible Afterglow
  62. GRB 130131B: host detection and redshift
  63. Konus-Wind observation of GRB 130310A
  64. IPN triangulation of GRB 130310A
  65. GRB 130310A: Fermi GBM detection
  66. GRB 130310A: Fermi-LAT detection and localization
  67. GRB 130306A: Swift-BAT refined analysis
  68. IPN triangulation of GRB 130228A
  69. GRB 130305A BAT refined circular
  70. GRB 130305A: Further Swift-XRT Observations
  71. Konus-Wind observation of GRB 130306A
  72. GRB 130305A: Optical Observations
  73. GRB 111123A: Keck-I host detection and VLT/X-shooter redshift
  74. GRB 130307A: Fermi GBM detection
  75. GRB 130306A: Fermi GBM observation
  76. GRB 130306A: MASTER-Net pre-Swift alert observation
  77. GRB 130305A: Swift/UVOT Upper Limit
  78. GRB 130305A: RATIR Observations
  79. GRB 130306A: Swift detection of a burst
  80. GRB 130305A: P60 Observations
  81. GRB 100615A: HST host detection and X-shooter redshift
  82. GRB 130305A: Swift/XRT detection of the afterglow
  83. Konus-Wind observation of GRB 130305A
  84. GRB 130305A: Fermi GBM observation
  85. GRB 130305A: Fermi LAT Detection
  86. GBM trigger 383712005 (GRB 130228A?) : Possible high-energy photon emission in Fermi/LAT data
  87. GRB 130305A found in ground analysis of Swift/BAT data
  88. GRB 121128A: optical upper limit in Maidanak observatory
  89. GRB 130216A: Swift/UVOT Upper Limit
  90. GRB 130219A: Suzaku WAM observation of the prompt emission
  91. SGR 1806-20 outburst (trigger 549841), Swift-BAT refined analysis
  92. Trigger 549841: Swift detection of SGR1806-20
  93. Konus-Wind observation of GRB 130219A
  94. GRB 130216B: Suzaku WAM observation of the prompt emission
  95. GRB 130216A: possible radio counterpart is steady field source
  96. GRB 130216A: Swift/XRT observations
  97. IPN Triangulation of GRB 130219A
  98. GRB 130215A: Suzaku WAM observation of the prompt emission
  99. GRB 130215A: PTF P48 optical detection
  100. GRB 130219A: Fermi GBM detection

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