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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"

28261 results found.

  1. GRB 110825A: optical afterglow candidate
  2. GRB 110825A: field inspection and possible host galaxy
  3. GRB110825A: Swift target of opportunity observation
  4. IPN triangulation of GRB110825A (very intense, long-duration)
  5. GRB 110820A, the review of the sky area in plate archives
  6. Swift-BAT Trigger 501485 is noise
  7. Swift-BAT refined analysis of SFXT IGR J08408-4503 (trigger 501368)
  8. IPN triangulation of GRB 110820B (very long duration, extremely intense)
  9. GRB 110820A: Swift/UVOT Upper Limits
  10. GRB 110820A: Swift-XRT refined Analysis
  11. GRB110820A: MITSuME Ishigakijima Optical Upper Limits
  12. GRB 110820A: Swift-BAT refined analysis
  13. GRB 110820A: Enhanced Swift-XRT position
  14. GRB 110820A: CrAO optical upper limit
  15. GRB 110820A: Swift detection of a burst
  16. GRB 110818A: Swift/UVOT Upper Limits
  17. GRB 110818A: Enhanced Swift-XRT position
  18. GRB 110818A: Optical afterglow and redshift from VLT/X-shooter
  19. GRB 110818A: Swift-XRT refined Analysis
  20. GRB 110815A: Swift-XRT and UVOT refined Analysis
  21. GRB 110818A, Swift-BAT refined analysis
  22. GRB 110815A : Suzaku WAM observation of the prompt emission
  23. GRB 110818A: Swift detection of a burst
  24. GRB 110801A: Konus-Wind and Swift/BAT joint spectral analysis
  25. GRB 110801A: optical observations at Mt. Terskol observatory
  26. GRB 110812A: SuperAGILE localization of a long GRB.
  27. RXTE Discovery of the Spin Period of Swift J1834.9-0846
  28. GRB 110808A: Swift/UVOT Detection
  29. GRB 110808A: Swift-BAT refined analysis
  30. GRB 110808A: Swift-XRT refined Analysis
  31. SGR J1834.9-0846: A Neutron Star in W41?
  32. Swift SGR 1834.9-0846: Swift-BAT refined analysis
  33. GRB 110808A: Enhanced Swift-XRT position
  34. GRB 110808A: Swift detection of a burst with optical counterpart
  35. Fermi GBM detection of a SGR-like burst
  36. GRB 110807A: SAO RAS observations
  37. GRB 110807A: Swift detection of a burst or a posible new SGR
  38. GRB 110726A: two epochs of SAO RAS optical observations
  39. IPN triangulation of GRB110802A (short/hard burst)
  40. GRB 110801A: optical observations in CrAO
  41. EVLA observation for Fermi burst GRB 110721A
  42. GRB 110731A : Suzaku WAM observation of the prompt emission
  43. GRB 110726A: Swift-XRT refined Analysis
  44. GRB 110801A: SAO RAS optical observations
  45. GRB110801A: MITSuME Ishigakijima Optical Observation at 1 day after the burst
  46. GRB 110801A: Swift-BAT refined analysis
  47. Swift/UVOT observations of GRB110801A
  48. GRB 110801A: Swift-XRT refined Analysis
  49. GRB110801A: MITSuME Ishigakijima Optical Observation
  50. GRB 110801A: Enhanced Swift-XRT position
  51. GRB 110801A: Swift detection of a burst with an optical counterpart
  52. GRB110731A: MITSuME Ishigakijima Optical Upper Limits
  53. GRB 110731A Gemini-N redshift
  54. GRB 110731A: Swift-XRT refined Analysis
  55. GRB110731A: Swift/UVOT Observations
  56. GRB 110731A: Fermi GBM observation
  57. GRB 110731A: NOT photometry
  58. GRB 110731A: Enhanced Swift-XRT position
  59. GRB 110731A: Swift-BAT refined analysis
  60. GRB 110731A: FTN+FTS afterglow observations
  61. GRB 110731A: Swift detection of a burst with an optical counterpart
  62. Sw J1644+57 (GRB 110328A): Continued VLBA Observations
  63. INTEGRAL Weak trigger #6331: GRT Optical Observation
  64. GRB 110721A: Swift observations of afterglow candidate
  65. AXP 4U 0142+61: Swift-BAT refined analysis
  66. GRB 110726A: optical upper limit in CrAO
  67. Swift detection of a SGR-like burst from the AXP 4U 0142+61
  68. GRB110726A: MITSuME Ishigakijima Optical Observation
  69. GRB 110726A: Further Swift/UVOT Observations
  70. GRB110726A: Gemini-N tentative redshift
  71. GRB 110726A: Swift-BAT refined analysis
  72. GRB 110726A: Enhanced Swift-XRT position
  73. GRB 110726A: Swift/UVOT Detection
  74. GRB 110726A: Liverpool Telescope observations
  75. GRB 110726: ROTSE-III Detection of Optical Counterpart
  76. GRB 110726A: Swift detection of a burst
  77. IPN triangulation of GRB 110721A
  78. GRB 110721A: Preliminary Swift/UVOT Upper Limits
  79. GRB 110721A: potential counterpart candidate
  80. GRB 110721A: Fermi-LAT detection
  81. GRB 110721A: Fermi GBM detection
  82. GRB 110715A : Suzaku WAM observation of the prompt emission
  83. GRB 110719A: GRT Optical Observation
  84. GRB 110719A: optical limit by "Pi of the Sky"
  85. GRB 110719A: z-band upper limit
  86. Swift/UVOT observations of GRB110719A
  87. GRB 110719A: Swift-XRT refined Analysis
  88. GRB 110719A: optical upper limit
  89. GRB 110719A: Enhanced Swift-XRT position
  90. GRB 110719A: Swift-BAT refined analysis
  91. GRB 110719A: Swift detection of a burst
  92. GRB 110709B : Suzaku WAM observation of the prompt emission
  93. Swift J1822.3-1606: Transient Magnetar or Be X-ray Binary?
  94. GRB110715A: GROND Detection of the Optical/NIR Afterglow
  95. GRB 110715A: APEX detection of the submm counterpart
  96. GRB 110715A: Swift-XRT refined Analysis
  97. GRB 110715A: Swift/UVOT Detection
  98. GRB 110715A: Enhanced Swift-XRT position
  99. GRB 110715A: Swift-BAT refined analysis
  100. Swift J1822.3-1606: A Probable New SGR in Ground Analysis of BAT Data

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