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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"

28248 results found.

  1. GRB 110820A: CrAO optical upper limit
  2. GRB 110820A: Swift detection of a burst
  3. GRB 110818A: Swift/UVOT Upper Limits
  4. GRB 110818A: Enhanced Swift-XRT position
  5. GRB 110818A: Optical afterglow and redshift from VLT/X-shooter
  6. GRB 110818A: Swift-XRT refined Analysis
  7. GRB 110815A: Swift-XRT and UVOT refined Analysis
  8. GRB 110818A, Swift-BAT refined analysis
  9. GRB 110815A : Suzaku WAM observation of the prompt emission
  10. GRB 110818A: Swift detection of a burst
  11. GRB 110801A: Konus-Wind and Swift/BAT joint spectral analysis
  12. GRB 110801A: optical observations at Mt. Terskol observatory
  13. GRB 110812A: SuperAGILE localization of a long GRB.
  14. RXTE Discovery of the Spin Period of Swift J1834.9-0846
  15. GRB 110808A: Swift/UVOT Detection
  16. GRB 110808A: Swift-BAT refined analysis
  17. GRB 110808A: Swift-XRT refined Analysis
  18. SGR J1834.9-0846: A Neutron Star in W41?
  19. Swift SGR 1834.9-0846: Swift-BAT refined analysis
  20. GRB 110808A: Enhanced Swift-XRT position
  21. GRB 110808A: Swift detection of a burst with optical counterpart
  22. Fermi GBM detection of a SGR-like burst
  23. GRB 110807A: SAO RAS observations
  24. GRB 110807A: Swift detection of a burst or a posible new SGR
  25. GRB 110726A: two epochs of SAO RAS optical observations
  26. IPN triangulation of GRB110802A (short/hard burst)
  27. GRB 110801A: optical observations in CrAO
  28. EVLA observation for Fermi burst GRB 110721A
  29. GRB 110731A : Suzaku WAM observation of the prompt emission
  30. GRB 110726A: Swift-XRT refined Analysis
  31. GRB 110801A: SAO RAS optical observations
  32. GRB110801A: MITSuME Ishigakijima Optical Observation at 1 day after the burst
  33. GRB 110801A: Swift-BAT refined analysis
  34. Swift/UVOT observations of GRB110801A
  35. GRB 110801A: Swift-XRT refined Analysis
  36. GRB110801A: MITSuME Ishigakijima Optical Observation
  37. GRB 110801A: Enhanced Swift-XRT position
  38. GRB 110801A: Swift detection of a burst with an optical counterpart
  39. GRB110731A: MITSuME Ishigakijima Optical Upper Limits
  40. GRB 110731A Gemini-N redshift
  41. GRB 110731A: Swift-XRT refined Analysis
  42. GRB110731A: Swift/UVOT Observations
  43. GRB 110731A: Fermi GBM observation
  44. GRB 110731A: NOT photometry
  45. GRB 110731A: Enhanced Swift-XRT position
  46. GRB 110731A: Swift-BAT refined analysis
  47. GRB 110731A: FTN+FTS afterglow observations
  48. GRB 110731A: Swift detection of a burst with an optical counterpart
  49. Sw J1644+57 (GRB 110328A): Continued VLBA Observations
  50. INTEGRAL Weak trigger #6331: GRT Optical Observation
  51. GRB 110721A: Swift observations of afterglow candidate
  52. AXP 4U 0142+61: Swift-BAT refined analysis
  53. GRB 110726A: optical upper limit in CrAO
  54. Swift detection of a SGR-like burst from the AXP 4U 0142+61
  55. GRB110726A: MITSuME Ishigakijima Optical Observation
  56. GRB 110726A: Further Swift/UVOT Observations
  57. GRB110726A: Gemini-N tentative redshift
  58. GRB 110726A: Swift-BAT refined analysis
  59. GRB 110726A: Enhanced Swift-XRT position
  60. GRB 110726A: Swift/UVOT Detection
  61. GRB 110726A: Liverpool Telescope observations
  62. GRB 110726: ROTSE-III Detection of Optical Counterpart
  63. GRB 110726A: Swift detection of a burst
  64. IPN triangulation of GRB 110721A
  65. GRB 110721A: Preliminary Swift/UVOT Upper Limits
  66. GRB 110721A: potential counterpart candidate
  67. GRB 110721A: Fermi-LAT detection
  68. GRB 110721A: Fermi GBM detection
  69. GRB 110715A : Suzaku WAM observation of the prompt emission
  70. GRB 110719A: GRT Optical Observation
  71. GRB 110719A: optical limit by "Pi of the Sky"
  72. GRB 110719A: z-band upper limit
  73. Swift/UVOT observations of GRB110719A
  74. GRB 110719A: Swift-XRT refined Analysis
  75. GRB 110719A: optical upper limit
  76. GRB 110719A: Enhanced Swift-XRT position
  77. GRB 110719A: Swift-BAT refined analysis
  78. GRB 110719A: Swift detection of a burst
  79. GRB 110709B : Suzaku WAM observation of the prompt emission
  80. Swift J1822.3-1606: Transient Magnetar or Be X-ray Binary?
  81. GRB110715A: GROND Detection of the Optical/NIR Afterglow
  82. GRB 110715A: APEX detection of the submm counterpart
  83. GRB 110715A: Swift-XRT refined Analysis
  84. GRB 110715A: Swift/UVOT Detection
  85. GRB 110715A: Enhanced Swift-XRT position
  86. GRB 110715A: Swift-BAT refined analysis
  87. Swift J1822.3-1606: A Probable New SGR in Ground Analysis of BAT Data
  88. GRB 110715A: Swift detection of a bright burst with an optical counterpart
  89. GRB 110709B: Swift/UVOT Observations
  90. GRB 110709B: Additional Gemini observations and deep limits on an optical afterglow
  91. Swift trigger 457076 is not a GRB
  92. GRB 110709A: Suzaku WAM observation of the prompt emission
  93. GRB 110709B: Submm observations from APEX
  94. IPN triangulation of GRB 110708B (long duration, extremely intense)
  95. Swift Trigger 457076: a possible GRB
  96. GRB 110709A: Swift/UVOT Upper Limits
  97. GRB 110709A: Konkoly observations
  98. GRB 110708A: Konkoly observations
  99. GRB 110709B BAT refined analysis
  100. GRB 110709B: burst detection from Swift-BAT slew data

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