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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"

45993 results found.

  1. SGR Swift J1834.9-0846: Correction to the Swift-BAT refined spectral analysis
  2. Trigger 502024: Swift detection of KS 1741-293
  3. GRB110825A: Fermi GBM observation
  4. SGR Swift J1834.9-0846: Swift-BAT refined analysis of trigger 501752
  5. Swift detection of an SGR burst from Swift J1834.9-0846
  6. GRB 110825A: Suzaku WAM observation of the prompt emission
  7. GRB 110825A: GMG optical observation
  8. GRB110825A: ROTSE early time optical limit
  9. GRB 110827A, Swift-BAT refined analysis
  10. GRB 110825A: optical afterglow candidate
  11. GRB 110827A: Swift detection of a burst
  12. GRB 110825A: field inspection and possible host galaxy
  13. GRB110825A: Swift target of opportunity observation
  14. IPN triangulation of GRB110825A (very intense, long-duration)
  15. GRB 110820A, the review of the sky area in plate archives
  16. Swift-BAT Trigger 501485 is noise
  17. Swift-BAT refined analysis of SFXT IGR J08408-4503 (trigger 501368)
  18. Fermi GBM trigger 110823.518 is not a GRB
  19. Swift J1834.9-0846: Precise X-ray Position and the Confirmation of its Spin Period
  20. Konus-Wind observation of GRB 110820B
  21. GRB 110820A: MASTER-NET first hour observations
  22. IPN triangulation of GRB 110820B (very long duration, extremely intense)
  23. GRB 110820A: Swift/UVOT Upper Limits
  24. GRB 110820A: Position udpate + 2nd epoch data
  25. GRB 110820A: i-band finding chart + correction to 12295
  26. GRB 110820A: CQUEAN izY Observation
  27. GRB 110820A: Swift-XRT refined Analysis
  28. GRB110820A: MITSuME Ishigakijima Optical Upper Limits
  29. GRB 110820A: Swift-BAT refined analysis
  30. GRB 110820A: Enhanced Swift-XRT position
  31. GRB 110820A: CrAO optical upper limit
  32. GRB 110820A: MASTER-NET observations
  33. GRB 110820A: Swift detection of a burst
  34. GRB 110818A: Fermi GBM observation
  35. GRB 110818A: Swift/UVOT Upper Limits
  36. GRB 110818A: Enhanced Swift-XRT position
  37. GRB 110818A: Optical afterglow and redshift from VLT/X-shooter
  38. GRB 110818A: Swift-XRT refined Analysis
  39. GRB 110815A: Swift-XRT and UVOT refined Analysis
  40. GRB 110818A, Swift-BAT refined analysis
  41. GRB 110815A : Suzaku WAM observation of the prompt emission
  42. GRB 110818A: Swift detection of a burst
  43. Konus-Wind observation of GRB 110815A
  44. IPN triangulation of GRB110815A (long, intense)
  45. GRB 110801A: Konus-Wind and Swift/BAT joint spectral analysis
  46. GRB 110801A: optical observations at Mt. Terskol observatory
  47. GRB 110812A: SuperAGILE localization of a long GRB.
  48. Reprocessed enhanced Swift-XRT positions and GRB products: update
  49. SGR 1834.9-0846/ GRB 110807A, I-band observations
  50. Konus-Wind observation of GRB 110808B
  51. Konus-Wind observation of GRB 110808A
  52. IPN triangulation of GRB 110808B (short/hard/intense)
  53. A new photometric resource for GRB observers
  54. RXTE Discovery of the Spin Period of Swift J1834.9-0846
  55. SGR 1834.9-0846/ GRB 110807A: archival IR observations
  56. Fermi Gamma-ray Burst Monitor trigger 110809.346 is not a GRB
  57. GRB 110808A: Swift/UVOT Detection
  58. Swift Trigger 458942 is probably not a burst
  59. GRB 110808A: Swift-BAT refined analysis
  60. GRB 110808A: Swift-XRT refined Analysis
  61. SGR J1834.9-0846: A Neutron Star in W41?
  62. Swift SGR 1834.9-0846: Swift-BAT refined analysis
  63. GRB 110808A: VLT/X-shooter spectroscopy
  64. GRB 110808A: Enhanced Swift-XRT position
  65. GRB 110808A: Swift detection of a burst with optical counterpart
  66. Fermi GBM detection of a SGR-like burst
  67. GRB 110807A: SAO RAS observations
  68. GRB 110807A: Swift detection of a burst or a posible new SGR
  69. Fermi Gamma-ray Burst Monitor trigger 110806.263 is not a GRB
  70. GRB 110726A: two epochs of SAO RAS optical observations
  71. Reprocessed enhanced Swift-XRT positions and GRB products
  72. Konus-Wind observation of GRB 110802A
  73. Fermi GBM trigger 334123030 (110804165) is not a GRB
  74. IPN triangulation of GRB110802A (short/hard burst)
  75. GRB 110801A: optical observations in CrAO
  76. EVLA observation for Fermi burst GRB 110721A
  77. GRB 110731A : Suzaku WAM observation of the prompt emission
  78. GRB 110726A: Swift-XRT refined Analysis
  79. GRB110731A: MOA optical observations of the steeply fading afterglow
  80. GRB 110801A: SAO RAS optical observations
  81. GRB110801A: MITSuME Ishigakijima Optical Observation at 1 day after the burst
  82. GRB 110801A: Evidence for a jet break
  83. GRB 110801A: MASTER OT observations
  84. GRB 110801A: Swift-BAT refined analysis
  85. Swift/UVOT observations of GRB110801A
  86. GRB 110801A: Swift-XRT refined Analysis
  87. GRB 110801A: Afterglow redshift from 10.4m GTC
  88. GRB110801A: MITSuME Ishigakijima Optical Observation
  89. GRB 110801A: Enhanced Swift-XRT position
  90. AXP 4U 0142+61: Fermi GBM detection
  91. GRB 110801A: TLS Optical afterglow confirmation
  92. GRB 110801A: ROTSE-III Detection of re-brightening from OT
  93. GRB 110801A: Swift detection of a burst with an optical counterpart
  94. GRB 110731A / EVLA upper limits
  95. GRB110731A: MITSuME Ishigakijima Optical Upper Limits
  96. GRB 110731A Gemini-N redshift
  97. GRB 110731A: Swift-XRT refined Analysis
  98. Konus-Wind observation of GRB 110731A
  99. GRB110731A: Swift/UVOT Observations
  100. GRB 110731A: Fermi GBM observation

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