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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"

27963 results found.

  1. GRB 130518A: Fermi LAT detection
  2. GRB 130518A: Fermi GBM detection
  3. GRB 130515A: IRSF NIR Observation
  4. GRB 130515A: Further Gemini Observations
  5. Konus-Wind observation of GRB 130515A
  6. GRB 130514B: RATIR Optical and NIR Observations
  7. GRB 130515A: Fermi GBM detection
  8. GRB 130427A: Skynet detections of a possible supernova
  9. GRB 130515A: Swift-XRT refined Analysis
  10. GRB 130515A: Swift/UVOT Upper Limits
  11. GRB 130514B Swift-BAT observations
  12. GRB 130515A: Swift-BAT refined analysis
  13. GRB 130515A: Gemini/GMOS Observations
  14. GRB 130515A: GROND Observations
  15. GRB 130515A: Enhanced Swift-XRT position
  16. GRB 130511A: SSO 2.3m observation
  17. GRB 130514B: Swift-XRT Observations
  18. GRB 130515A: Swift detection of a short burst
  19. GRB 130514A: Swift-XRT refined Analysis
  20. GRB 130514A: Skynet/PROMPT/DSO Detections
  21. GRB 130513A: Bassano Bresciano optical upper limit
  22. GRB 130427A: Spectroscopic detection of the SN from the 10.4m GTC
  23. GRB 130427A: optical observations
  24. GRB 130514A: RATIR Optical and NIR Observations
  25. GRB 130513A: RATIR Optical and NIR Observations
  26. GRB 130513A: Swift/UVOT Upper Limits
  27. GRB 130514A: Swift/UVOT Upper Limits
  28. GRB 130514A: Enhanced Swift-XRT position
  29. GRB 130514A: Swift-BAT refined analysis
  30. GRB 130513A: Swift-XRT detection of the afterglow.
  31. GRB 130514A: GROND optical-NIR afterglow discovery and photo-z
  32. GRB 130514A: P60 Observations
  33. GRB 130514A: Swift detection of a burst
  34. GRB 130427A: Tautenburg 2nd epoch: No break, no clear SN
  35. GRB130508A: MASTER-Net optical observations
  36. GRB 130511A: Swift-XRT refined Analysis
  37. GRB 130511A, Swift-BAT refined analysis
  38. GRB 130511A: Enhanced Swift-XRT position
  39. GRB 130511A: Gemini-North Redshift
  40. GRB 130511A: Swift detection of a burst with an optical counterpart
  41. GRB 130508A: Swift/UVOT Upper Limits
  42. GRB 130427A: host galaxy observations
  43. GRB 130508A: RATIR Optical and NIR Observations
  44. GRB 130508A: Refined Swift-XRT analysis: Correction to GCN 14612
  45. GRB 130508A, Swift-BAT refined analysis
  46. Fermi Trigger 130507.091 - Detection of a SGR-like Burst
  47. GRB130508A: BOOTES-3 optical limit
  48. GRB 130427A: Ten nights of Skynet/PROMPT/GORT observations
  49. GRB 130508A: Swift detection of a probable burst
  50. GRB 130427A, LBT optical spectrum
  51. GRB 130505B: Further Swift observations
  52. GRB 130504C: Swift-XRT afterglow confirmation
  53. GRB 130504C: Suzaku WAM observation of the prompt emission
  54. GRB 130504B: Suzaku WAM observation of the prompt emission
  55. GRB 130505A: Suzaku WAM observation of the prompt emission
  56. GRB 130427A, Watcher afterglow detection
  57. GRB 130505B: Swift Candidate Afterglow
  58. Refined IPN Triangulation of GRB 130502B
  59. GRB 130505A, Swift-BAT refined analysis
  60. GRB 130504C: further Swift-XRT observations
  61. Konus-Wind observation of GRB 130504C
  62. GRB 130505B: MAXI/GSC detection
  63. GRB 130505A: optical observations
  64. GRB 130504C: Swift-XRT observations
  65. GRB 130504C: Fermi GBM detection
  66. GRB 130427A: optical observations in CrAO
  67. GRB 130502A: optical upper limit
  68. GRB 130505A: Swift-XRT refined Analysis
  69. GRB 130505A: Largest E_iso ever measured
  70. Konus-Wind observation of GRB 130505A
  71. GRB 130504C: Fermi-LAT detection of a burst
  72. Swift/UVOT observations of GRB130505A
  73. GRB 130505A: Enhanced Swift-XRT position
  74. GRB 130505A: MAXI/GSC detection
  75. Konus-Wind observation of GRB 130504B
  76. GRB 130505A: Swift detection of a burst with optical afterglow
  77. IPN Triangulation of GRB 130504B
  78. GRB 130504B: Fermi GBM detection
  79. GRB 130504A: Bassano Bresciano Observatory optical upper limit
  80. GRB 130504A: Enhanced XRT position
  81. GRB 130502B: Suzaku WAM observation of the prompt emission
  82. GRB 130504A: Swift/UVOT Upper Limits
  83. GRB 130502B: Swift-XRT refined Analysis
  84. GRB 130504A, Swift-BAT refined analysis
  85. Swift-XRT X-ray afterglow candidate for GRB 130504A (BAT trigger 555096)
  86. Trigger 555096: Swift detection of a possible burst
  87. GRB 130502A: Swift-BAT refined analysis
  88. GRB 130427A: Non-observation of VHE emission with HAWC
  89. GRB130502A: MASTER-Net optical observations
  90. GRB 130502A: Swift-XRT refined Analysis
  91. IPN Triangulation of GRB 130502B
  92. GRB 130502A: Fermi GBM detection
  93. GRB 130502B: Swift/UVOT Upper Limits
  94. GRB 130502A: Swift/UVOT Upper Limits
  95. Konus-Wind observation of GRB 130502B
  96. GRB 130502B Swift-XRT observations
  97. GRB 130502A: RATIR Optical and NIR Observations
  98. GRB 130502A: Enhanced Swift-XRT position
  99. GRB 130502B: Fermi LAT Detection
  100. GRB 130502B: Fermi GBM detection of a burst

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