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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

14803 results found.

  1. IPN Triangulation of GRB 131014A
  2. GRB 131018B: Fermi GBM observation
  3. GRB 131018B: Fermi-LAT detection of a burst
  4. GRB 131014A: Suzaku WAM observation of the prompt emission
  5. GRB 131014A: GROND observations
  6. GRB 131014A: RATIR Optical/NIR Afterglow Confirmation
  7. Fermi 403206457 / GRB 131011A: AAO optical observations
  8. GRB 131014A: RATIR Optical and NIR Observations
  9. GRB 131014A: Enhanced XRT position
  10. Konus-Wind observation of GRB 131014A
  11. GRB 131014A: Nanshan optical observations
  12. GRB 131014A: Swift detection of a possible X-ray afterglow
  13. GRB 131014A Tiled Swift observations
  14. GRB 131014A: Fermi-LAT detection
  15. GRB 131014A: Fermi GBM detection
  16. GRB 131011A: GROND afterglow observations
  17. GRB 130925A: Possible signatures of binary nature in the afterglow - Request for observations
  18. GRB 130831A: Continued RATIR Optical and NIR Observations
  19. GRB 131004A: MOSFIRE NIR imaging
  20. GRB 131004A: Skynet PROMPT/DSO-14 upper limits
  21. GRB 131004A: RATIR Optical and NIR Upper Limits
  22. GRB131004A: TNG Redshift confirmation
  23. GRB 131004A: TNG optical afterglow confirmation
  24. GRB 131002A, Swift-BAT refined analysis
  25. GRB 131002A: Swift/UVOT Detection
  26. GRB 131002A: Swift detection of a burst
  27. GRB 130925A: continuing Swift/XRT monitoring
  28. Fermi LAT Upper Limits on GRB 130925A
  29. GRB 130925A: Continued RATIR Optical and NIR Observations
  30. GRB 130925A: Fermi GBM Detection
  31. Konus-Wind observation of GRB 130925A
  32. Observation of possible GRB/TDE 130925A by INTEGRAL/SPI-ACS: three activity episodes
  33. GRB 130925A: RATIR Optical and NIR Observations
  34. GRB 130925A Swift-BAT refined analysis
  35. GRB 130925A: Initial Similarities to Swift J1644+57
  36. IPN Triangulation of SGR-like burst 130913 - probable association with SGR/AXP 1E1841-045
  37. GRB 130831A: RATIR Confirmation of NIR/Optical Afterglow Flattening
  38. GRB 130903A: optical observations
  39. GRB 130907A: Maidanak optical observations
  40. GRB 130912A: AAO optical upper limit
  41. GRB 130919A: Skynet PROMPT-CTIO optical upper limits
  42. GRB 130903A: Further Swift XRT observations.
  43. Konus-Wind observation of GRB 130912A
  44. GRB 130907A: Continued RATIR Optical and NIR Observations
  45. GRB 130912A: P60 Observations
  46. GRB 130912A: REM optical/NIR upper limits
  47. GRB 130907A: Continued RATIR Optical and NIR Observations
  48. GRB 130907A: RATIR Optical and NIR Observations
  49. GRB 130828A: Further Swift XRT observations
  50. GRB 130907A: INTEGRAL/SPI-ACS light curve
  51. Konus-Wind observation of GRB 130907A
  52. GRB 130907A: VLA detection
  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: RATIR Optical and NIR Afterglow Confirmation
  57. GRB 130907A: Skynet DSO-14/Yerkes-41 detections of a possible afterglow
  58. GRB 130831A: Maidanak optical observations
  59. GRB 130822A: nearby galaxy redshifts
  60. GRB 130903A: Fermi GBM observation
  61. GRB 130831A: Continued Skynet/PROMPT-SSO, PROMPT-CTIO and Yerkes-41 detections
  62. GRB 130831B: GROND upper limits
  63. GRB 130831A : Xinglong 60cm optical observation
  64. Konus-Wind observation of GRB 130831A
  65. GRB 130831A: MITSuME Akeno Optical observation
  66. GRB 130831A: Faulkes Telescope North and South optical afterglow
  67. GRB 130829A: NOT optical observations
  68. GRB 130829A: Swift detection of a burst
  69. GRB 130828A Tiled Swift observations
  70. GRB 130828A: Fermi-LAT detection of a burst
  71. IPN triangulation of GRB130821A
  72. Konus-Wind observation of GRB 130821A
  73. GRB 130821A: Fermi-LAT detection of a burst
  74. Konus-Wind observation of GRB 130812B
  75. GRB 130812A: GROND upper limits
  76. Konus-Wind observation of GRB 130804A
  77. GRB 130623A: GROND detection of the optical/NIR afterglow
  78. SGR 1745-29 (Swift trigger 565443), Swift-BAT refined analysis
  79. GRB130803A: GROND observations
  80. GRB 130804A; Fermi GBM observation
  81. GRB 130803A: RATIR Optical and NIR Observations
  82. GRB 130803A; Fermi GBM observation
  83. Konus-Wind observation of GRB 130727A
  84. GRB 130727A: GROND observations
  85. GRB130725B: REM-ROS2 optical observations
  86. GRB 130702A in the Ep,i - Eiso plane
  87. Konus-Wind observation of GRB 130722A
  88. GRB 130722A: Swift/UVOT Detection
  89. GRB 130722A: MITSuME Okayama upper limits
  90. GRB 130722C Tiled Swift observations
  91. GRB 130722A: Skynet/GORT observations
  92. GRB 130715A: Suzaku WAM observation of the prompt emission
  93. GRB 130716A: Fermi GBM observation
  94. GRB 130716A: Gemini-North imaging
  95. GRB 130626A: Retraction of possible X-ray afterglow
  96. GRB 130708A: Swift XRT and UVOT Observations
  97. GRB 130702A: TNG spectroscopic observations of the emerging supernova
  98. GRB 130708A: Fermi GBM observation
  99. GRB 130708A found in ground analysis of Swift-BAT data
  100. GRB 130702A: Maidanak optical observations

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