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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"

45492 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. Konus-Wind observation of GRB 130320B
  8. Swift detection of IGR J18245-2452
  9. IPN Triangulation of GRB 130320B (very long/bright)
  10. Swift/XRT observation of GRB 130327B
  11. GRB 130327A: RATIR Optical/NIR afterglow confirmation
  12. GRB 130306A: Confirmation of the X-ray Afterglow
  13. GRB 130310A: RATIR Observations
  14. Swift Trigger 552142 is a noise event
  15. Konus-Wind observation of GRB 130327B
  16. GRB 130327B: Fermi-LAT detection of a burst
  17. GRB 130327B: Fermi GBM detection
  18. Swift Trigger 552142: a possible GRB
  19. GRB 130327B: gamma-ray detection by AGILE
  20. GRB 130327A: Swift-BAT refined analysis
  21. GRB 130327A: Gemini Observations
  22. GRB 130327A: Swift-XRT refined Analysis
  23. GRB 130327A: Weihai optical obsevations
  24. GRB 130327A: Swift/UVOT Upper Limits
  25. Konus-Wind observation of GRB 130325A
  26. GRB 130327A: ISON-NM optical upper limit
  27. GRB 130325A Tiled Swift observations
  28. GRB 130327A: Enhanced Swift-XRT position
  29. GRB 130327A: RATIR Optical and NIR Observations
  30. GRB 130327A: PAIRITEL NIR Afterglow Candidate
  31. GRB 130325A: Fermi LAT detection
  32. GRB 130327A: Swift detection of a burst
  33. report: GRB 130315A: Zadko observatory - Gingin optical observations
  34. GRB 130325A: Fermi GBM detection
  35. Konus-Wind observation of GRB 130320A
  36. IPN Triangulation of GRB 130320A (long/very bright)
  37. GRB 130305A: Gemini follow-up observations
  38. GRB 130315A: GROND afterglow candidate
  39. GRB 130305A: optical upper limit in Mondy observatory
  40. GRB 130315A: Swift/UVOT Upper Limits
  41. GRB 130313A: optical upper limit in CrAO
  42. GRB 130313A: optical upper limit in Mondy observatory
  43. GRB 130315A: SALT optical observations
  44. GRB130313A: GTC early optical limits
  45. GRB 130313A: 5.8 GHz VLA upper limit
  46. GRB 130315A: Swift-XRT refined Analysis
  47. Swift XRT observations of GRB 130310A
  48. GRB 130315A, Swift-BAT refined analysis
  49. GRB 130313A: Swift/UVOT Upper Limits
  50. GRB 130305A: PTF P48 optical upper limits
  51. GRB130315A BOOTES-3 optical limit
  52. GRB 130315A: Swift detection of a burst
  53. GRB 130310A : Suzaku WAM observation of the prompt emission
  54. GRB 130305A: TLS Tautenburg observations
  55. GRB 130313A: RATIR Optical and NIR Observations
  56. GRB 130313A: TNG optical observations
  57. GRB 130313A: Fading X-ray Afterglow
  58. Swift-BAT trigger 551030 is not astrophysical
  59. GRB 130215A: Detection of the SN with the 10.4m GTC
  60. GRB130313A: Optical observations from GTC
  61. GRB 130313A: NOT optical upper limit
  62. GRB 130313A: Swift-XRT refined Analysis
  63. GRB 130313A: simultaneous and follow-up optical observations at BOOTES-3 and BOOTES-4
  64. GRB 130313A: Weihai optical upper limit
  65. GRB 130313A: Swift-XRT detection of a possible X-ray afterglow
  66. GRB 130313A: Swift-BAT refined analysis
  67. GRB 130313A: Zadko observatory - Gingin optical observations
  68. GRB 130313A: MASTER-Net optical observations
  69. GRB 130313A: Swift detection of a short burst
  70. IPN Triangulation of GRB 130307A
  71. GRB 100424A: Keck host detection and VLT/X-shooter redshift
  72. Swift XRT RETRACTION of GRB 130310A afterglow detection
  73. GRB 130310A: optical observations
  74. Swift XRT observations of GRB 130310A
  75. GRB 130306A: Swift Detection of a Possible Afterglow
  76. GRB 130131B: host detection and redshift
  77. Konus-Wind observation of GRB 130310A
  78. IPN triangulation of GRB 130310A
  79. GRB 130310A: Fermi GBM detection
  80. GRB 130310A: Fermi-LAT detection and localization
  81. GRB 130131A: JCMT SCUBA-2 sub-mm observations
  82. GRB 130306A: MITSuME Ishigakijima upper limits
  83. GRB 130306A: Swift-BAT refined analysis
  84. IPN triangulation of GRB 130228A
  85. GRB 130305A BAT refined circular
  86. GRB 130305A: Further Swift-XRT Observations
  87. Konus-Wind observation of GRB 130306A
  88. GRB 130305A: Optical Observations
  89. GRB 111123A: Keck-I host detection and VLT/X-shooter redshift
  90. GRB 130305A: Gemini-North upper limit
  91. GRB 130307A: Fermi GBM detection
  92. GRB 130306A: Fermi GBM observation
  93. GRB 130306A: MASTER-Net pre-Swift alert observation
  94. GRB 130305A: Swift/UVOT Upper Limit
  95. GRB 130305A: RATIR Observations
  96. GRB 130306A: Swift detection of a burst
  97. GRB 130305A: P60 Observations
  98. GRB 100615A: HST host detection and X-shooter redshift
  99. GRB 130305A: Swift/XRT detection of the afterglow
  100. Konus-Wind observation of GRB 130305A

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