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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"

14753 results found.

  1. Konus-Wind observation of GRB 131125A
  2. GRB 131127A: CQUEAN riz Observation
  3. GRB 131128A: T100 observations
  4. GRB 131127B: MASTER-Net optical observations
  5. GRB 131127B: Nanshan optical observations
  6. Konus-Wind observation of GRB 131127B
  7. IPN Triangulation of GRB 131127B
  8. GRB 131127A: RATIR Optical and NIR Observations, High-z Candidate
  9. GRB 131122A: a long GRB detected with INTEGRAL
  10. Konus-Wind observation of GRB 131118A
  11. GRB 131118A: Fermi GBM detection
  12. GRB 131117A: Skynet PROMPT optical detection of an afterglow
  13. GRB 130925A: HST imaging
  14. GRB 131031A: Mondy optical observations
  15. GRB 131108A: ISON Blagoveshensk upper limit
  16. GRB 131108A: optical observations
  17. GRB 131108A: Continued RATIR Optical and NIR Observations
  18. GRB 131030A: MITSuME Akeno Optical observation
  19. Konus-Wind observation of GRB 131108A
  20. GRB 131108A: AGILE/GRID observation
  21. GRB 131108A: TAROT-Calern optical observation
  22. GRB 131108A: Fermi-LAT refined analysis
  23. GRB 131108A: NOT optical observations
  24. GRB 131108A Tiled Swift observations
  25. GRB 131108A: Fermi-LAT onboard detection of a burst
  26. GRB 131030A: RATIR Optical and NIR Upper Limits
  27. GRB 131030A: Continued RATIR Optical and NIR Observations
  28. GRB 131031A: Swift-XRT afterglow confirmation
  29. GRB 131029A: Suzaku WAM observation of the prompt emission
  30. GRB 131024B: Suzaku WAM observation of the prompt emission
  31. Konus-Wind observation of GRB 131105A
  32. GRB 131103A: NOT and VLT observations
  33. GRB 131030A: Continued RATIR Optical and NIR Observations
  34. GRB 131018B: RATIR Optical/NIR Observations
  35. GRB 131030A: Continued RATIR Optical and NIR Observations
  36. GRB 131031A: Swift/UVOT Upper Limits
  37. GRB 131018B: Further Swift-XRT observations.
  38. GRB 131030A - RoboPol optical afterglow polarimetry
  39. Konus-Wind observation of GRB 131031A
  40. GRB 131030A: P60 observations
  41. GRB 131030A: RATIR Optical and NIR Observations
  42. GRB 131024C: ICSP discovery of a burst in X-rays by balloon borne study
  43. Konus-Wind observation of GRB 131030A
  44. GRB 131029A: Nanshan optical observations
  45. GRB 131029A Tiled Swift observations
  46. GRB 131029A: Fermi-LAT detection of a burst
  47. Konus-Wind observation of GRB 131028A
  48. Swift-BAT Trigger 575905 is probably not a real source
  49. GRB 131024B: Fermi GBM observation
  50. Konus-Wind observation of GRB 131011B
  51. IPN Triangulation of GRB 131014A
  52. GRB 131018B: Fermi GBM observation
  53. GRB 131018B: Fermi-LAT detection of a burst
  54. GRB 131014A: Suzaku WAM observation of the prompt emission
  55. GRB 131014A: GROND observations
  56. GRB 131014A: RATIR Optical/NIR Afterglow Confirmation
  57. Fermi 403206457 / GRB 131011A: AAO optical observations
  58. GRB 131014A: RATIR Optical and NIR Observations
  59. GRB 131014A: Enhanced XRT position
  60. Konus-Wind observation of GRB 131014A
  61. GRB 131014A: Nanshan optical observations
  62. GRB 131014A: Swift detection of a possible X-ray afterglow
  63. GRB 131014A Tiled Swift observations
  64. GRB 131014A: Fermi-LAT detection
  65. GRB 131014A: Fermi GBM detection
  66. GRB 131011A: GROND afterglow observations
  67. GRB 130925A: Possible signatures of binary nature in the afterglow - Request for observations
  68. GRB 130831A: Continued RATIR Optical and NIR Observations
  69. GRB 131004A: MOSFIRE NIR imaging
  70. GRB 131004A: Skynet PROMPT/DSO-14 upper limits
  71. GRB 131004A: RATIR Optical and NIR Upper Limits
  72. GRB131004A: TNG Redshift confirmation
  73. GRB 131004A: TNG optical afterglow confirmation
  74. GRB 131002A, Swift-BAT refined analysis
  75. GRB 131002A: Swift/UVOT Detection
  76. GRB 131002A: Swift detection of a burst
  77. GRB 130925A: continuing Swift/XRT monitoring
  78. Fermi LAT Upper Limits on GRB 130925A
  79. GRB 130925A: Continued RATIR Optical and NIR Observations
  80. GRB 130925A: Fermi GBM Detection
  81. Konus-Wind observation of GRB 130925A
  82. Observation of possible GRB/TDE 130925A by INTEGRAL/SPI-ACS: three activity episodes
  83. GRB 130925A: RATIR Optical and NIR Observations
  84. GRB 130925A Swift-BAT refined analysis
  85. GRB 130925A: Initial Similarities to Swift J1644+57
  86. IPN Triangulation of SGR-like burst 130913 - probable association with SGR/AXP 1E1841-045
  87. GRB 130831A: RATIR Confirmation of NIR/Optical Afterglow Flattening
  88. GRB 130903A: optical observations
  89. GRB 130907A: Maidanak optical observations
  90. GRB 130912A: AAO optical upper limit
  91. GRB 130919A: Skynet PROMPT-CTIO optical upper limits
  92. GRB 130903A: Further Swift XRT observations.
  93. Konus-Wind observation of GRB 130912A
  94. GRB 130907A: Continued RATIR Optical and NIR Observations
  95. GRB 130912A: P60 Observations
  96. GRB 130912A: REM optical/NIR upper limits
  97. GRB 130907A: Continued RATIR Optical and NIR Observations
  98. GRB 130907A: RATIR Optical and NIR Observations
  99. GRB 130828A: Further Swift XRT observations
  100. GRB 130907A: INTEGRAL/SPI-ACS light curve

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