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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"

28100 results found.

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

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