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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"

45671 results found.

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

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