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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"

28058 results found.

  1. GRB 131229A: Deep Gemini-South Imaging
  2. GRB 131229A: Swift detection of a burst
  3. GRB 131224A: 5.8 GHz VLA observations
  4. GRB 131227A: Swift-XRT refined Analysis
  5. GRB 131227A: Xinglong optical observations
  6. GRB 131227A: Swift/UVOT Upper Limits
  7. GRB 131227A: Swift-BAT refined analysis
  8. GRB 131227A: Enhanced Swift-XRT position
  9. GRB 131227A: OT candidate from KAIT Optical observations
  10. GRB 131227A: Swift detection of a burst
  11. GRB 131224A: Swift/UVOT Upper Limits
  12. GRB 131225A: MASTER-Net optical observations
  13. GRB 131226A, Swift-BAT refined analysis
  14. GRB 131226A: Swift detection of a burst
  15. GRB 131216A: Suzaku WAM observation of the prompt emission
  16. GRB 131224A: Swift-XRT observation
  17. GRB 131225A: MAXI/GSC detection
  18. GRB 131224A: MASTER-Net early optical observations
  19. GRB 131224A: A short GRB detected by INTEGRAL
  20. GRB 131218A: GROND Upper Limits
  21. GRB 131218A: Swift XRT and UVOT observations
  22. GRB 131218A: Zadko observatory - Gingin optical candidate
  23. GRB 131218A: TAROT La Silla observatory optical observations
  24. IPN Triangulation of GRB 131216A
  25. GRB 131216A: Fermi GBM observation
  26. GRB 131216A: Fermi-LAT detection of a burst
  27. GRB 131215A: MAXI/GSC detection
  28. Trigger 581129: Swift-BAT triggered on noise
  29. GRB 131205A: GROND confirmation of afterglow
  30. INTEGRAL Weak trigger #6403: AROMA-N Optical Observation
  31. GRB 131209A: Swift XRT and UVOT observations
  32. GRB 131209A: Fermi GBM observation
  33. IPN Triangulation of GRB 131209A
  34. GRB131202A : GROND observations
  35. GRB131205A : GROND Observations
  36. GRB 131205A: Swift-BAT refined analysis
  37. GRB 131205A: Swift-XRT refined Analysis
  38. GRB 131205A: Swift/UVOT Upper Limits
  39. GRB 131205A: Enhanced Swift-XRT position
  40. GRB 131205A: Zadko observatory - Gingin optical observations
  41. GRB 131205A: Swift detection of a burst
  42. GRB 131202A: theoretical estimation of the redshift
  43. GRB 131127B: archival confirmation of iPTF13ecv as a CV
  44. GRB 131126A: iPTF upper limits on the afterglow of a short GRB
  45. GRB 131202A, Swift-BAT refined analysis
  46. GRB 131202A: Swift/UVOT Upper Limits
  47. GRB 131202A: Swift-XRT refined Analysis
  48. GRB 131202A: RATIR Optical and NIR Observations
  49. GRB 131202A: Enhanced Swift-XRT position
  50. GRB 131202A: Bassano Bresciano Observatory optical upper limit
  51. GRB 131202A: Tautenburg observations
  52. GRB 060614: theoretical derivation of the redshift and need for deeper search of the host galaxy
  53. GRB 131202A: Swift detection of a burst
  54. GRB 131127B: Bassano Bresciano Observatory optical observations of iPTF13ecv
  55. GRB 131128A: Bassano Bresciano Observatory optical upper limit
  56. GRB 131127A: RATIR Rejection of High-z Candidate
  57. GRB 131128A; Fermi GBM observation
  58. GRB 131125A: MASTER-Net very early optical observations
  59. GRB 131125A: iPTF upper limits on the afterglow of a short GRB
  60. IPN Triangulation of GRB 131126A (short/hard)
  61. GRB 131127A: CQUEAN riz Observation
  62. GRB 131128A: GROND observations of the afterglow
  63. GRB 131128A: Swift/UVOT Detection
  64. GRB 131128A: AROMA-N Optical Observation
  65. GRB 131127B: Bassano Bresciano Observatory optical observations
  66. GRB 131128A: Swift-XRT refined Analysis
  67. GRB 131128A: Kanata/HOWPol optical observation
  68. GRB 131128A: T100 observations
  69. GRB 131128A: Swift-BAT refined analysis
  70. GRB 131128A: Enhanced Swift-XRT position
  71. GRB 131128A: Nanshan afterglow confirmation
  72. GRB 131128A: Nanshan afterglow candidate
  73. GRB 131128A: Swift detection of a burst
  74. GRB 131127A: Bassano Bresciano Observatory optical upper limit
  75. GRB 131127B: Fermi GBM detection
  76. GRB 131127A: Swift/UVOT Upper Limits
  77. GRB 131127A: AROMA-N Optical Observation
  78. GRB 131127A: RATIR Optical and NIR Observations, High-z Candidate
  79. GRB 131127A: Swift-XRT refined Analysis
  80. GRB 131127A, Swift-BAT refined analysis
  81. GRB 131127A: Enhanced Swift-XRT position
  82. GRB 131127A: Mondy optical upper limit
  83. GRB 131127A: Nanshan optical upper limit
  84. GRB 131127A: Swift detection of a burst
  85. GRB 131122A: Swift/UVOT Upper Limits
  86. GRB 131122A: Swift-XRT observations
  87. GRB 131122A: i-band observations from NOT
  88. GRB 131122A: Nanshan optical upper limit
  89. GRB 131122A: a long GRB detected with INTEGRAL
  90. GRB 131120A, Swift-BAT refined analysis
  91. IPN Triangulation of GRB 131118A
  92. GRB 131118A: Fermi GBM detection
  93. GRB 131030A, Optical Observations
  94. GRB 131117A, Swift-BAT refined analysis
  95. GRB 131117A: TAROT La Silla observatory optical observations
  96. GRB 131117A: Swift/UVOT Detection
  97. GRB 131117A: Swift-XRT refined Analysis
  98. GRB 131117A: GROND confirmation of the afterglow and photo-z.
  99. GRB 131117A: Enhanced Swift-XRT position
  100. GRB 131117A: Skynet PROMPT optical detection of an afterglow

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