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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"

37679 results found.

  1. GRB 130407A Tiled Swift observations
  2. GRB 130407A: MAXI/GSC detection
  3. GRB 130211A: Retraction of afterglow candidate
  4. GRB 130327B: Suzaku WAM observation of the prompt emission
  5. Konus-Wind observation of GRB 130320B
  6. IPN Triangulation of GRB 130320B (very long/bright)
  7. Swift/XRT observation of GRB 130327B
  8. GRB 130327A: RATIR Optical/NIR afterglow confirmation
  9. GRB 130306A: Confirmation of the X-ray Afterglow
  10. GRB 130310A: RATIR Observations
  11. Swift Trigger 552142 is a noise event
  12. Konus-Wind observation of GRB 130327B
  13. GRB 130327B: Fermi-LAT detection of a burst
  14. GRB 130327B: Fermi GBM detection
  15. Swift Trigger 552142: a possible GRB
  16. GRB 130327B: gamma-ray detection by AGILE
  17. GRB 130327A: Swift-BAT refined analysis
  18. GRB 130327A: Gemini Observations
  19. GRB 130327A: Swift-XRT refined Analysis
  20. GRB 130327A: Weihai optical obsevations
  21. GRB 130327A: Swift/UVOT Upper Limits
  22. Konus-Wind observation of GRB 130325A
  23. GRB 130327A: ISON-NM optical upper limit
  24. GRB 130325A Tiled Swift observations
  25. GRB 130327A: Enhanced Swift-XRT position
  26. GRB 130327A: RATIR Optical and NIR Observations
  27. GRB 130327A: PAIRITEL NIR Afterglow Candidate
  28. GRB 130325A: Fermi LAT detection
  29. GRB 130327A: Swift detection of a burst
  30. report: GRB 130315A: Zadko observatory - Gingin optical observations
  31. GRB 130325A: Fermi GBM detection
  32. Konus-Wind observation of GRB 130320A
  33. IPN Triangulation of GRB 130320A (long/very bright)
  34. GRB 130305A: Gemini follow-up observations
  35. GRB 130315A: GROND afterglow candidate
  36. GRB 130305A: optical upper limit in Mondy observatory
  37. GRB 130315A: Swift/UVOT Upper Limits
  38. GRB 130313A: optical upper limit in CrAO
  39. GRB 130313A: optical upper limit in Mondy observatory
  40. GRB 130315A: SALT optical observations
  41. GRB130313A: GTC early optical limits
  42. GRB 130313A: 5.8 GHz VLA upper limit
  43. GRB 130315A: Swift-XRT refined Analysis
  44. Swift XRT observations of GRB 130310A
  45. GRB 130315A, Swift-BAT refined analysis
  46. GRB 130313A: Swift/UVOT Upper Limits
  47. GRB 130305A: PTF P48 optical upper limits
  48. GRB130315A BOOTES-3 optical limit
  49. GRB 130315A: Swift detection of a burst
  50. GRB 130310A : Suzaku WAM observation of the prompt emission
  51. GRB 130305A: TLS Tautenburg observations
  52. GRB 130313A: RATIR Optical and NIR Observations
  53. GRB 130313A: TNG optical observations
  54. GRB 130313A: Swift-BAT Spectral lag analysis
  55. GRB 130313A: Fading X-ray Afterglow
  56. GRB 130215A: Detection of the SN with the 10.4m GTC
  57. GRB130313A: Optical observations from GTC
  58. GRB 130313A: NOT optical upper limit
  59. GRB 130313A: Swift-XRT refined Analysis
  60. GRB 130313A: simultaneous and follow-up optical observations at BOOTES-3 and BOOTES-4
  61. GRB 130313A: Weihai optical upper limit
  62. GRB 130313A: Swift-XRT detection of a possible X-ray afterglow
  63. GRB 130313A: Swift-BAT refined analysis
  64. GRB 130313A: Zadko observatory - Gingin optical observations
  65. GRB 130313A: MASTER-Net optical observations
  66. GRB 130313A: Swift detection of a short burst
  67. IPN Triangulation of GRB 130307A
  68. GRB 100424A: Keck host detection and VLT/X-shooter redshift
  69. Swift XRT RETRACTION of GRB 130310A afterglow detection
  70. GRB 130310A: optical observations
  71. Swift XRT observations of GRB 130310A
  72. GRB 130306A: Swift Detection of a Possible Afterglow
  73. GRB 130131B: host detection and redshift
  74. Konus-Wind observation of GRB 130310A
  75. IPN triangulation of GRB 130310A
  76. GRB 130310A: Fermi GBM detection
  77. GRB 130310A: Fermi-LAT detection and localization
  78. GRB 130131A: JCMT SCUBA-2 sub-mm observations
  79. GRB 130306A: MITSuME Ishigakijima upper limits
  80. GRB 130306A: Swift-BAT refined analysis
  81. IPN triangulation of GRB 130228A
  82. GRB 130305A BAT refined circular
  83. GRB 130305A: Further Swift-XRT Observations
  84. Konus-Wind observation of GRB 130306A
  85. GRB 130305A: Optical Observations
  86. GRB 111123A: Keck-I host detection and VLT/X-shooter redshift
  87. GRB 130305A: Gemini-North upper limit
  88. GRB 130307A: Fermi GBM detection
  89. GRB 130306A: Fermi GBM observation
  90. GRB 130306A: MASTER-Net pre-Swift alert observation
  91. GRB 130305A: Swift/UVOT Upper Limit
  92. GRB 130305A: RATIR Observations
  93. GRB 130306A: Swift detection of a burst
  94. GRB 130305A: P60 Observations
  95. GRB 100615A: HST host detection and X-shooter redshift
  96. GRB 130305A: Swift/XRT detection of the afterglow
  97. Konus-Wind observation of GRB 130305A
  98. GRB 130305A: Fermi GBM observation
  99. GRB 130305A: Fermi LAT Detection
  100. Fermi GBM trigger 130301.638 is not GRB

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