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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"

28301 results found.

  1. GRB 110918A: INT optical detection of Swift candidate afterglow
  2. GRB 110918A: Swift-XRT observations
  3. GRB110918A: BOOTES-1 optical limit
  4. Swift detection of short bursts from PSR J1647-4552
  5. GRB 110915A: Konus-Wind and Swift/BAT joint spectral analysis
  6. GRB 110915B: GROND Observations of the Optical/NIR Afterglow Candidate
  7. GRB 110915A: Swift/UVOT Upper Limits
  8. GRB 110915B: Swift/UVOT Upper Limits
  9. GRB 110915A: GROND Upper limits
  10. GRB 110915A, Swift-BAT refined analysis
  11. GRB 110915A: Swift-XRT refined Analysis
  12. GRB 110915B: Afterglow candidate from OSN
  13. GRB 110915A: Deep Near-IR Limits from Magellan
  14. GRB 110915B: XRT afterglow candidate
  15. GRB 110903A: Suzaku WAM observation of the prompt emission
  16. GRB 110915A: Deep Gemini-South i/z-band imaging
  17. GRB110915A MITSuME Okayama J-band upper-limit
  18. GRB 110915A: MITSuME Okayama and Ishigakijima Optical upper limits
  19. GRB 110915A: NOT observations
  20. GRB 110915A: 1.23m CAHA I-band observations
  21. GRB 110915B: SuperAGILE localization of a long GRB
  22. GRB 110915A: Enhanced Swift-XRT position
  23. GRB 110915A: GMG optical upper limit
  24. GRB 110915A: MASTER-Net early limit
  25. GRB 110915A: Swift detection of a burst
  26. GRB 110825A: Further Swift/XRT Observations
  27. GRB 110731A: SAO RAS and Terskol observations
  28. GRB 110906A(?): Burst detection (unconfirmed) from Swift-BAT slew data
  29. GRB 110905A: Potential BAT trigger on MAXI J1836-194
  30. GRB 110903A: Swift/UVOT Upper Limits
  31. GRB 110903A: Swift-XRT observations
  32. GRB 110820A: optical upper limit
  33. SGR Swift J1834.9-0846: Correction to the Swift-BAT refined spectral analysis
  34. Trigger 502024: Swift detection of KS 1741-293
  35. GRB110825A: Fermi GBM observation
  36. SGR Swift J1834.9-0846: Swift-BAT refined analysis of trigger 501752
  37. Swift detection of an SGR burst from Swift J1834.9-0846
  38. GRB 110825A: Suzaku WAM observation of the prompt emission
  39. GRB 110825A: GMG optical observation
  40. GRB 110827A, Swift-BAT refined analysis
  41. GRB 110825A: optical afterglow candidate
  42. GRB 110825A: field inspection and possible host galaxy
  43. GRB110825A: Swift target of opportunity observation
  44. IPN triangulation of GRB110825A (very intense, long-duration)
  45. GRB 110820A, the review of the sky area in plate archives
  46. Swift-BAT Trigger 501485 is noise
  47. Swift-BAT refined analysis of SFXT IGR J08408-4503 (trigger 501368)
  48. IPN triangulation of GRB 110820B (very long duration, extremely intense)
  49. GRB 110820A: Swift/UVOT Upper Limits
  50. GRB 110820A: Swift-XRT refined Analysis
  51. GRB110820A: MITSuME Ishigakijima Optical Upper Limits
  52. GRB 110820A: Swift-BAT refined analysis
  53. GRB 110820A: Enhanced Swift-XRT position
  54. GRB 110820A: CrAO optical upper limit
  55. GRB 110820A: Swift detection of a burst
  56. GRB 110818A: Swift/UVOT Upper Limits
  57. GRB 110818A: Enhanced Swift-XRT position
  58. GRB 110818A: Optical afterglow and redshift from VLT/X-shooter
  59. GRB 110818A: Swift-XRT refined Analysis
  60. GRB 110815A: Swift-XRT and UVOT refined Analysis
  61. GRB 110818A, Swift-BAT refined analysis
  62. GRB 110815A : Suzaku WAM observation of the prompt emission
  63. GRB 110818A: Swift detection of a burst
  64. GRB 110801A: Konus-Wind and Swift/BAT joint spectral analysis
  65. GRB 110801A: optical observations at Mt. Terskol observatory
  66. GRB 110812A: SuperAGILE localization of a long GRB.
  67. RXTE Discovery of the Spin Period of Swift J1834.9-0846
  68. GRB 110808A: Swift/UVOT Detection
  69. GRB 110808A: Swift-BAT refined analysis
  70. GRB 110808A: Swift-XRT refined Analysis
  71. SGR J1834.9-0846: A Neutron Star in W41?
  72. Swift SGR 1834.9-0846: Swift-BAT refined analysis
  73. GRB 110808A: Enhanced Swift-XRT position
  74. GRB 110808A: Swift detection of a burst with optical counterpart
  75. Fermi GBM detection of a SGR-like burst
  76. GRB 110807A: SAO RAS observations
  77. GRB 110807A: Swift detection of a burst or a posible new SGR
  78. GRB 110726A: two epochs of SAO RAS optical observations
  79. IPN triangulation of GRB110802A (short/hard burst)
  80. GRB 110801A: optical observations in CrAO
  81. EVLA observation for Fermi burst GRB 110721A
  82. GRB 110731A : Suzaku WAM observation of the prompt emission
  83. GRB 110726A: Swift-XRT refined Analysis
  84. GRB 110801A: SAO RAS optical observations
  85. GRB110801A: MITSuME Ishigakijima Optical Observation at 1 day after the burst
  86. GRB 110801A: Swift-BAT refined analysis
  87. Swift/UVOT observations of GRB110801A
  88. GRB 110801A: Swift-XRT refined Analysis
  89. GRB110801A: MITSuME Ishigakijima Optical Observation
  90. GRB 110801A: Enhanced Swift-XRT position
  91. GRB 110801A: Swift detection of a burst with an optical counterpart
  92. GRB110731A: MITSuME Ishigakijima Optical Upper Limits
  93. GRB 110731A Gemini-N redshift
  94. GRB 110731A: Swift-XRT refined Analysis
  95. GRB110731A: Swift/UVOT Observations
  96. GRB 110731A: Fermi GBM observation
  97. GRB 110731A: NOT photometry
  98. GRB 110731A: Enhanced Swift-XRT position
  99. GRB 110731A: Swift-BAT refined analysis
  100. GRB 110731A: FTN+FTS afterglow observations

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