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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"

24514 results found.

  1. Trigger 574266 is not a Swift detection of a known source
  2. GRB 130925A: Possible signatures of binary nature in the afterglow - Request for observations
  3. GRB 130831A: VLT/FORS2 spectroscopic detection of a supernova
  4. GRB 131004A: MOSFIRE NIR imaging
  5. GRB 131004A: Skynet PROMPT/DSO-14 upper limits
  6. GRB 131004A, Swift-BAT refined analysis
  7. GRB 131004A: Fermi GBM observation
  8. GRB 131004A: GROND observations of the afterglow
  9. GRB 131004A: Liverpool Telescope optical afterglow observations
  10. GRB 131004A: optical afterglow from the NOT
  11. GRB 131002A, Swift-BAT refined analysis
  12. GRB 131002A: Fermi GBM observation
  13. GRB 131002B, Swift-BAT refined analysis
  14. GRB 131002B: GROND upper limits
  15. GRB 131001A, Swift-BAT refined analysis
  16. GRB 131002A: Swift-XRT refined Analysis
  17. Swift J1242.9-3530, Swift-BAT refined analysis
  18. NuSTAR observations of GRB 130925A
  19. GRB 130925A: continuing Swift/XRT monitoring
  20. Swift Operations in the event of a US Government shutdown
  21. GRB 130930A: Swift detection of a burst
  22. GRB 130929A, Swift-BAT refined analysis
  23. Fermi LAT Upper Limits on GRB 130925A
  24. GRB 130925A: Swift/UVOT Detection of the Host Galaxy
  25. GRB 130925A: Fermi GBM Detection
  26. Konus-Wind observation of GRB 130925A
  27. Observation of possible GRB/TDE 130925A by INTEGRAL/SPI-ACS: three activity episodes
  28. GRB 130925A Swift-BAT refined analysis
  29. GRB 130925A: Historical non-detection from Rosat-HRI
  30. Fermi GBM detection of GRB 130925A and a possible precursor
  31. GRB 130925A: Swift-XRT refined Analysis
  32. GRB 130925A: Swift detection of a burst
  33. GRB 130903A: optical observations
  34. INTEGRAL detection of a SGR-like burst likely from SGR J1745-29
  35. GRB 130919A: Skynet PROMPT-CTIO optical upper limits
  36. GRB 130919A, Swift-BAT refined analysis
  37. GRB 130913A detected in ground analysis of Swift-BAT data
  38. GRB 130919A: Swift detection of a burst
  39. Fermi/GBM Detection of two SGR-like bursts possibly associated with SGR J1833-0832
  40. Konus-Wind observation of GRB 130912A
  41. GRB 130912A: P60 Observations
  42. GRB 130907A: MASTER refined analysis
  43. GRB 130912A: Fermi GBM detection
  44. GRB 130912A: Skynet DSO-14/Yerkes-41/PROMPT-CTIO observations
  45. GRB 130912A, Swift-BAT refined analysis
  46. GRB 130907A: Further Swift-BAT refined analysis
  47. GRB 130907A: INTEGRAL/SPI-ACS light curve
  48. Konus-Wind observation of GRB 130907A
  49. GRB 130907A, Swift-BAT refined analysis
  50. GRB 130907A: T21 optical observations
  51. GRB 130907A: VLA detection
  52. GRB 130907A: Swift-XRT refined Analysis
  53. GRB 120916A: Fermi-LAT detection of a burst
  54. GRB 130907A: Early Tautenburg detections, red afterglow
  55. GRB 130907A: Skynet DSO-14/Yerkes-41/GORT confirmation of a fading afterglow
  56. GRB 130907A: Skynet DSO-14/Yerkes-41 detections of a possible afterglow
  57. GRB 130907A: NOT redshift
  58. GRB 130907A: MASTER early OT observations
  59. Swift follow-up results of the possible weak INTEGRAL GRB
  60. GRB 130903A: GROND Afterglow Discovery
  61. GRB 130903A: MASTER early optical limit
  62. GRB 130903A: Fermi GBM observation
  63. GRB 130903A: Swift-XRT observations
  64. Swift trigger 569022 is a new Galactic source Swift J1734.5-3027
  65. GRB 130903A: ISON-Kislovodsk optical Upper Limits
  66. GRB 130903A: GROND Upper Limits
  67. GRB 130903A: A long GRB detected by INTEGRAL
  68. GRB 130831A: Continued Skynet/PROMPT-SSO, PROMPT-CTIO and Yerkes-41 detections
  69. GRB 130831B, Swift-BAT refined analysis
  70. Swift Trigger 569022: a possible GRB
  71. GRB 130831A: THO optical observation
  72. GRB 130831A, Swift-BAT refined analysis
  73. GRB 130831B: Swift-XRT refined Analysis
  74. GRB 130831A: Montarrenti Observatory optical observations
  75. GRB 130831A: Skynet/PROMPT-SSO detections
  76. Konus-Wind observation of GRB 130831A
  77. GRB 130831A: Faulkes Telescope North and South optical afterglow
  78. GRB 130829A: AAO optical observations
  79. GRB 130828A: Swift XRT and UVOT observations
  80. GRB 130829A: NOT optical observations
  81. GRB 130829A: Swift detection of a burst
  82. GRB 130828A: Fermi GBM detection
  83. GRB 130828A: Fermi-LAT detection of a burst
  84. IPN triangulation of GRB130821A
  85. Konus-Wind observation of GRB 130821A
  86. GRB 130821A: Weihai optical upper limit
  87. GRB 130822A: Gemini Observations
  88. GRB 130822A, Swift-BAT refined analysis
  89. GRB 130821A: Fermi-LAT detection of a burst
  90. GRB 130821A: Fermi GBM Detection
  91. GRB 130822A: Swift detection of a short burst
  92. GRB 130816B, Swift-BAT refined analysis
  93. GRB 130816A, Swift-BAT refined analysis
  94. GRB 130816A: Fermi GBM observation
  95. GRB 130816B: Swift detection of a burst
  96. Konus-Wind observation of GRB 130812B
  97. IPN Triangulation of GRB 130812B (long/soft)
  98. GRB 130812A, Swift-BAT refined analysis
  99. GRB 130807A, Swift-BAT refined analysis
  100. Konus-Wind observation of GRB 130804A

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