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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"

42597 results found.

  1. MAXI ID=745548350 is UV Ceti
  2. GRB 140320D: MASTER optical observations
  3. GRB 140329A: Fermi GBM observation of a bright burst
  4. Swift trigger 593744: detection of a flare from UV Cet
  5. GRB 140320D: Suzaku WAM observation of the prompt emission
  6. GRB 140323A : Suzaku WAM observation of the prompt emission
  7. Fermi Gamma-ray Burst Monitor trigger 417486540 / 140326020 is not a GRB
  8. GRB 140226A/iPTF14yb: Mondy optical observations
  9. GRB 140320C: Mondy optical observations and afterglow confirmation
  10. Konus-Wind observation of GRB 140323A
  11. GRB 140323A: Fermi-LAT detection
  12. GRB 140323A: Swift-XRT refined Analysis
  13. GRB 140323A: Fermi GBM observation
  14. GRB 140323A: BOOTES-3 optical upper limit.
  15. GRB 140323A: Swift-BAT refined analysis
  16. GRB 140323A: Enhanced Swift-XRT position
  17. GRB 140323A: Swift detection of a burst
  18. GRB 140320A: RATIR Optical and NIR Observations
  19. Konus-Wind observation of GRB 140320D
  20. GRB 140320B: P60 detection of a very red afterglow
  21. IPN Triangulation of very intense GRB 140320D
  22. GRB 140320C: Mini-GWAC prompt observation
  23. GRB 140320A: Swift-BAT refined analysis
  24. GRB 140320C: Swift-XRT observations
  25. GRB 140320A: Confirmation of a fading X-ray afterglow
  26. GRB 140320C: Swift-XRT detection of the X-ray afterglow
  27. GRB 140320A: Fermi GBM detection
  28. GRB 140320B: Swift-XRT detection of the afterglow
  29. GRB 140320C: Mondy optical observations
  30. GRB 140320A: Enhanced Swift-XRT position
  31. GRB 140320A: Swift-XRT detection of an afterglow candidate
  32. GRB 140320C: MASTER optical observations
  33. GRB 140320C: FTN optical observations
  34. GRB 140320C: A long GRB detected by INTEGRAL
  35. GRB 140320B: ISON-NM optical observations
  36. GRB 140320B: A long GRB detected by INTEGRAL
  37. GRB 140320B: FTN optical afterglow candidate
  38. Swift Trigger 592558 is not an astrophysical source
  39. GRB 140320A: Fermi GBM observations suggest a short GRB
  40. GRB 140320A: Swift detection of a burst
  41. GRB 140318A: Continued RATIR Optical and NIR Observations
  42. GRB 140318A: Mondy optical limit
  43. GRB 140318A: Swift-BAT refined analysis
  44. GRB 140311B: Mondy optical limit
  45. GRB 140311A: Mondy optical limits
  46. GRB 140318A: Swift-XRT refined Analysis
  47. GRB 140318A: Liverpool Telescope optical observations
  48. GRB 140318A: Enhanced Swift-XRT position
  49. GRB 140318A: RATIR Optical and NIR Detections
  50. GRB140318A: Discovery Channel Telescope Optical Detection
  51. GRB 140318A: WHT spectroscopy
  52. GRB 140318A: NOT detection of the afterglow
  53. GRB 140318A: Swift detection of a burst
  54. GRB 140311A: VLA Detection
  55. GRB140308A: Suzaku WAM observation of the prompt emission
  56. GRB 140311C: MASTER optical observations
  57. GRB 140311C: Swift-XRT and UVOT observations
  58. GRB 140311C: MASTER before, during and after trigger optical observations
  59. GRB 140311A: further NOT observations
  60. GRB 140311B: Swift-BAT refined analysis
  61. GRB 140311A: RATIR Optical and NIR Detection
  62. GRB 140311C: Fermi GBM Detection
  63. GRB 140311B: Fermi GBM Detection
  64. GRB 140311A: Kottamia I-band observation
  65. GRB 140311A: Swift/UVOT Upper Limits
  66. Fermi416242156: possible iPTF counterpart
  67. GRB 140311B: RATIR Optical and NIR Observations
  68. GRB 140311A: Bassano Bresciano Observatory optical upper limit
  69. GRB 140311A: Swift-XRT refined Analysis
  70. GRO J1744-28: Fermi GBM observation
  71. GRB 140311A: Gemini-North redshift
  72. GRB 140302A: GROND confirmation of the afterglow
  73. GRB 140311A: NOT redshift confirmation
  74. GRB 140311B: Swift-XRT refined Analysis
  75. GRB 140311A: Swift-BAT refined analysis
  76. GRB 140311A: Gemini-South redshift
  77. GRB 140311B: final MASTER OT light curve
  78. GRB 140311A: Enhanced Swift-XRT position
  79. GRB 140311B: Enhanced Swift-XRT position
  80. GRB 140311A: Recalibration of photometry of OT detected with Kottamia 188cm telescope
  81. GRB 140311A: Nanshan afterglow decay
  82. GRB 140311B: TAROT Calern observatory optical observations
  83. GRB 140311A: Optical follow-up observation with Kottamia 188cm telescope
  84. GRB 140311A: NOT observations of the optical afterglow
  85. GRB 140311A: Zadko observatory - Gingin optical observations
  86. GRB140311B: Swift/XRT position
  87. GRB 140311B: Swift-XRT observations
  88. GRB 140311B: Nanshan afterglow detection
  89. GRB 140311B: MASTER early optical observations
  90. GRB 140311A: Nanshan OT detection
  91. GRB 140311A: MASTER early optical observations
  92. GRB 140311B: Swift detection of a burst
  93. GRB 140311A: Swift detection of a probable burst
  94. Konus-Wind observation of GRB 140308A
  95. GRB 140304A: Suzaku WAM observation of the prompt emission
  96. IPN Triangulation of GRB 140308A
  97. GRB 140306A: Suzaku WAM observation of the prompt emission
  98. Konus-Wind observation of GRB 140306A
  99. IPN Triangulation of GRB 140306A
  100. GRB 140304A: Continued RATIR Optical and NIR Observations

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