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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"

28304 results found.

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

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