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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"

12375 results found.

  1. GRB 140110A Tiled Swift observations
  2. GRB 140110A: Fermi-LAT detection of a burst
  3. GRB 140105A: MASTER-Net early optical observations and time correction
  4. GRB 131231A: AAO optical observations
  5. GRB 140108A: Fermi GBM detection
  6. New Fermi-LAT GRB Table
  7. GRB 140105A: HCT Observations
  8. GRB 140105A: continued iPTF observations and rejection of optical candidates
  9. GRB 140105A: Swift XRT observations
  10. GRB 140104B: Swift XRT observations
  11. GRB 140105A: Fermi GBM detection
  12. GRB 140104B: Fermi GBM observation
  13. Fermi410578384: iPTF optical afterglow candidates for a possible short GRB
  14. GRB 140102A: BOOTES-4 early optical observations
  15. GRB 140104B: Fermi-LAT detection of a burst
  16. GRB 131209A: Further Swift XRT observations
  17. GRB 131231A, Optical Observations
  18. GRB 140102A: P60 observations
  19. GRB 131231A: Swift/UVOT Observations of the Optical Afterglow
  20. GRB 131231A: Fermi GBM correction to GCN 15644
  21. Konus-Wind observation of GRB 131231A
  22. GRB 140102A: Fermi/GBM Observation
  23. Konus-Wind observation of GRB 140102A
  24. GRB 140102A: Fermi-LAT detection of a burst
  25. GRB 131229A: Fermi GBM detection
  26. GRB 131231A: Swift-XRT observations
  27. GRB 131231A: VLT/X-shooter redshift
  28. GRB 131231A: Fermi GBM detection
  29. GRB 131231A: afterglow confirmation from the NOT
  30. GRB 131231A: Nanshan afterglow candidate
  31. GRB 131231A: Fermi-LAT detection of a burst
  32. GRB 131216A: Suzaku WAM observation of the prompt emission
  33. Fermi Gamma-ray Burst Monitor trigger 409187680/131219968 is not a GRB
  34. IPN Triangulation of GRB 131216A
  35. GRB 131216A: Fermi GBM observation
  36. GRB 131216A: Fermi-LAT detection of a burst
  37. GRB 131209A: Swift XRT and UVOT observations
  38. GRB 131209A: Fermi GBM observation
  39. GRB 131209A Tiled Swift observations
  40. Konus-Wind observation of GRB 131209A
  41. IPN Triangulation of GRB 131209A
  42. GRB 131209A: Fermi-LAT detection of a burst
  43. GRB 131127B: archival confirmation of iPTF13ecv as a CV
  44. GRB 131127B: rejection of optical counterpart candidates
  45. GRB 131126A: Fermi GBM observation
  46. GRB 131126A: iPTF upper limits on the afterglow of a short GRB
  47. GRB 131202A: Fermi GBM Detection
  48. GRB 131128A; Fermi GBM observation
  49. GRB 131125A: MASTER-Net very early optical observations
  50. GRB 131125A: iPTF upper limits on the afterglow of a short GRB
  51. IPN Triangulation of GRB 131126A (short/hard)
  52. IPN Triangulation of GRB 131125A (short/hard)
  53. GRB 131127B: Bassano Bresciano Observatory optical observations
  54. GRB 131127B: Nanshan optical observations
  55. Konus-Wind observation of GRB 131127B
  56. IPN Triangulation of GRB 131127B
  57. GRB 131127B: Fermi GBM detection
  58. Fermi407254341: iPTF optical afterglow candidates
  59. Konus-Wind observation of GRB 131118A
  60. IPN Triangulation of GRB 131118A
  61. Fermi Gamma-ray Burst Monitor trigger 406601061 / 131120031 is not a GRB
  62. GRB 131118A: Fermi GBM detection
  63. GRB 131108A: VLA Observations
  64. Fermi GBM trigger 406351590 / 131117143 is not a GRB
  65. Konus-Wind observation of GRB 131108A
  66. GRB 131108A: CARMA 3mm detection
  67. GRB 131108A: Fermi GBM observation
  68. GRB 131108A: Swift/UVOT Detection
  69. GRB 131108A: Swift-XRT observations
  70. GRB 131108A: TAROT-Calern optical observation
  71. GRB 131108A: Fermi-LAT refined analysis
  72. GRB 131108A: NOT optical observations
  73. GRB 131108A: Redshift from 10.4m GTC
  74. GRB 131108A: Swift detection of a possible X-ray afterglow
  75. GRB 131108A Tiled Swift observations
  76. GRB 131108A: Fermi-LAT onboard detection of a burst
  77. GRB 131029A: Suzaku WAM observation of the prompt emission
  78. GRB 131105A: Fermi GBM observation
  79. GRB 131031A: Fermi GBM detection
  80. GRB 131018B: Further Swift-XRT observations.
  81. GRB 131031A: MASTER optical observation
  82. GRB 131031A found in ground analysis of BAT data
  83. GRB 131024C: ICSP discovery of a burst in X-rays by balloon borne study
  84. GRB 131029A: Nanshan optical observations
  85. GRB 131029A: Fermi GBM observation
  86. GRB 131029A Tiled Swift observations
  87. GRB 131029A: Fermi-LAT detection of a burst
  88. Konus-Wind observation of GRB 131028A
  89. IPN Triangulation of GRB 131028A (long/bright)
  90. GRB 131028A: Fermi GBM detection
  91. GRB 131024B: Fermi GBM observation
  92. Fermi GBM trigger 13121024.436 is not a GRB
  93. IPN Triangulation of GRB 131014A
  94. GRB 131018B: Swift-XRT observations
  95. GRB 131018B: Fermi GBM observation
  96. GRB 131018B: Fermi-LAT detection of a burst
  97. GRB 131014A: Suzaku WAM observation of the prompt emission
  98. GRB 131014A: GROND observations
  99. Fermi GBM data availability during U.S. government shutdown
  100. GRB 131014A: Swift-XRT refined Analysis

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