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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"

19663 results found.

  1. GRB 111008A: Enhanced Swift-XRT position
  2. GRB 111008A, Swift-BAT refined analysis,
  3. GRB 111008A: Swift detection of a burst
  4. GRB 111005A: Swift-BAT refined analysis
  5. GRB 111005A: Swift detection of a burst
  6. GRB 110905A / MAXI J1836-194: optical monitoring
  7. GRB 110928A: RAPTOR Limits During Gamma-ray Emitting Interval
  8. GRB 110928A: Swift/UVOT Upper Limits
  9. Trigger 504307: Swift detection of MAXI J1836-194
  10. GRB 110928A: Swift-XRT refined Analysis
  11. GRB 110928A: Enhanced Swift-XRT position
  12. GRB 110928A: P60 Observations
  13. GRB 110928A: Further PAIRITEL NIR Observations
  14. GRB 110928A: Swift-BAT refined analysis
  15. GRB 110928A: Swift-XRT observations
  16. GRB 110928A: Swift/UVOT finding chart observation
  17. GRB 110928A: ROTSE-III Optical Limits
  18. GRB 110928A: Swift detection of a burst
  19. Swift-BAT trigger 503926 is noise
  20. GRB 110924A: Swift detection of a possible burst
  21. GRB 110921A: Swift/UVOT Observations
  22. GRB 110921A: NOT observations
  23. GRB 110921A: Fermi GBM observation
  24. GRB 110921A: Swift-XRT refined Analysis
  25. GRB 110921A, Swift-BAT refined analysis
  26. GRB 110921A: optical observations in Mt. Terskol and Maidanak observatories
  27. GRB 110921A: Enhanced Swift-XRT position
  28. GRB 110918A: Swift-XRT refined Analysis
  29. GRB 110921A: MASTER-Net early limit
  30. GRB 110921A: Swift detection of a burst
  31. GRB 110915B : X-ray afterglow confirmation
  32. GRB 110918A: Swift/UVOT Detection of the Optical Counterpart
  33. GRB 110918A: INT optical detection of Swift candidate afterglow
  34. GRB 110918A: Swift-XRT observations
  35. Swift detection of short bursts from PSR J1647-4552
  36. GRB 110915A: Konus-Wind and Swift/BAT joint spectral analysis
  37. IPN triangulation of GRB 110918A (long duration, extremely intense)
  38. GRB 110915A: Swift/UVOT Upper Limits
  39. GRB 110915B: Swift/UVOT Upper Limits
  40. GRB 110915A: GROND Upper limits
  41. GRB 110915A, Swift-BAT refined analysis
  42. GRB 110915A: Swift-XRT refined Analysis
  43. GRB 110915B: XRT afterglow candidate
  44. GRB 110915A: 1.23m CAHA I-band observations
  45. GRB 110915A: Enhanced Swift-XRT position
  46. GRB 110915A: MASTER-Net early limit
  47. GRB 110915A: Prompt enhanced Swift-XRT position
  48. GRB 110915A: Swift detection of a burst
  49. GRB 110825A: Further Swift/XRT Observations
  50. GRB 110731A: SAO RAS and Terskol observations
  51. GRB 110906A(?): Burst detection (unconfirmed) from Swift-BAT slew data
  52. MAXI J1836-194 (originally GRB 110905A): Swift-BAT refined analysis
  53. GRB 110905A: Potential BAT trigger on MAXI J1836-194
  54. GRB 110905A: Swift detection of a burst
  55. GRB 110903A: Swift/UVOT Upper Limits
  56. GRB 110903A: Swift-XRT observations
  57. GRB 110820A: optical upper limit
  58. SGR Swift J1834.9-0846: Correction to the Swift-BAT refined spectral analysis
  59. Trigger 502024: Swift detection of KS 1741-293
  60. SGR Swift J1834.9-0846: Swift-BAT refined analysis of trigger 501752
  61. Swift detection of an SGR burst from Swift J1834.9-0846
  62. GRB 110827A, Swift-BAT refined analysis
  63. GRB 110827A: Swift detection of a burst
  64. GRB110825A: Swift target of opportunity observation
  65. IPN triangulation of GRB110825A (very intense, long-duration)
  66. Swift-BAT Trigger 501485 is noise
  67. Swift-BAT refined analysis of SFXT IGR J08408-4503 (trigger 501368)
  68. Swift J1834.9-0846: Precise X-ray Position and the Confirmation of its Spin Period
  69. IPN triangulation of GRB 110820B (very long duration, extremely intense)
  70. GRB 110820A: Swift/UVOT Upper Limits
  71. GRB 110820A: Swift-XRT refined Analysis
  72. GRB 110820A: Swift-BAT refined analysis
  73. GRB 110820A: Enhanced Swift-XRT position
  74. GRB 110820A: CrAO optical upper limit
  75. GRB 110820A: MASTER-NET observations
  76. GRB 110820A: Swift detection of a burst
  77. GRB 110818A: Fermi GBM observation
  78. GRB 110818A: Swift/UVOT Upper Limits
  79. GRB 110818A: Enhanced Swift-XRT position
  80. GRB 110818A: Swift-XRT refined Analysis
  81. GRB 110815A: Swift-XRT and UVOT refined Analysis
  82. GRB 110818A, Swift-BAT refined analysis
  83. GRB 110818A: Swift detection of a burst
  84. IPN triangulation of GRB110815A (long, intense)
  85. GRB 110801A: Konus-Wind and Swift/BAT joint spectral analysis
  86. GRB 110801A: optical observations at Mt. Terskol observatory
  87. Reprocessed enhanced Swift-XRT positions and GRB products: update
  88. SGR 1834.9-0846/ GRB 110807A, I-band observations
  89. IPN triangulation of GRB 110808B (short/hard/intense)
  90. RXTE Discovery of the Spin Period of Swift J1834.9-0846
  91. GRB 110808A: Swift/UVOT Detection
  92. Swift Trigger 458942 is probably not a burst
  93. GRB 110808A: Swift-BAT refined analysis
  94. GRB 110808A: Swift-XRT refined Analysis
  95. SGR J1834.9-0846: A Neutron Star in W41?
  96. Swift SGR 1834.9-0846: Swift-BAT refined analysis
  97. GRB 110808A: Enhanced Swift-XRT position
  98. GRB 110808A: Swift detection of a burst with optical counterpart
  99. Fermi GBM detection of a SGR-like burst
  100. GRB 110807A: Swift detection of a burst or a posible new SGR

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