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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"

6667 results found.

  1. GRB 130609B: Fermi GBM observation
  2. GRB 130610A: Fermi GBM Observation
  3. GRB 130606B: Swift/UVOT Upper Limit
  4. GRB 130610A: Swift-XRT refined Analysis
  5. GRB 130609B: Swift-XRT refined Analysis
  6. GRB 130610A: PAIRITEL NIR Afterglow Observations
  7. GRB 130609A: Fermi GBM observation
  8. GRB 130608A: Swift-XRT refined Analysis
  9. GRB 130609A: Swift-XRT refined Analysis
  10. GRB 130606B: Swift-XRT observations
  11. GRB 130603A: AAO optical observations
  12. GRB 130606A: Swift-XRT refined Analysis
  13. GRB 130606A: PAIRITEL NIR Afterglow Observations
  14. GRB 130606B; Fermi GBM observation
  15. GRB 130606A:T100 observations
  16. GRB 130606B: Fermi-LAT detection of a bright hard burst
  17. GRB 130606A: Errata Ks magnutide in GCN 14792
  18. GRB 130606A: Errata of J and Ks magnitudes in GCN 14784
  19. GRB 130606A: Errata of J and Ks magnitudes in GCN 14784
  20. Virtual Telescope observations of GRB 130606A
  21. GRB 130605A: Swift-XRT refined Analysis
  22. Swift Trigger 557466 is not astrophysical
  23. GRB 130606A: IRSF NIR Observation
  24. GRB 130604A: Swift-XRT refined Analysis
  25. GRB 130604B: Fermi GBM detection
  26. GRB 130603B: VLT/X-shooter redshift confirmation
  27. GRB 130603B: Swift-XRT refined Analysis
  28. GRB 130603A: Swift-XRT refined Analysis
  29. GRB 130528A: Fermi GBM detection
  30. GRB 130529A: Swift-XRT refined Analysis
  31. GRB 130528A: Swift-XRT refined Analysis
  32. GRB 130527A: Swift-XRT refined Analysis
  33. GRB 130514B: Further Swift-XRT Observations
  34. Swift XRT observation of GRB 130518B
  35. GRB 130518A: Confirmation of the X-ray afterglow.
  36. GRB 130518A: Swift XRT and UVOT possible afterglow
  37. GRB 130518A: Fermi LAT detection
  38. GRB 130518A: Fermi GBM detection
  39. GRB 130515A: IRSF NIR Observation
  40. GRB 130515A: Fermi GBM detection
  41. GRB 130515A: Swift-XRT refined Analysis
  42. GRB 130514B: Swift-XRT Observations
  43. GRB 130514A: Swift-XRT refined Analysis
  44. GRB 130513A: Swift-XRT detection of the afterglow.
  45. GRB 130511A: Swift-XRT refined Analysis
  46. GRB 130508A: Refined Swift-XRT analysis: Correction to GCN 14612
  47. GRB 130505B: Further Swift observations
  48. GRB 130504C: Swift-XRT afterglow confirmation
  49. GRB 130505B: Swift Candidate Afterglow
  50. GRB 130505A: Tautenburg afterglow observations
  51. GRB 130504C: further Swift-XRT observations
  52. GRB 130504C: Swift-XRT observations
  53. GRB 130504C: Fermi GBM detection
  54. GRB 130505A: Swift-XRT refined Analysis
  55. GRB 130504C: Fermi-LAT detection of a burst
  56. GRB 130505A: iTelescope T12 optical observations
  57. GRB 130504B: Fermi GBM detection
  58. GRB 130502B: Swift-XRT refined Analysis
  59. Trigger 555096: Swift detection of a possible burst
  60. GRB 130427A: Non-observation of VHE emission with HAWC
  61. GRB 130502A: Swift-XRT refined Analysis
  62. GRB 130502A: Fermi GBM detection
  63. GRB 130502B Swift-XRT observations
  64. GRB 130502B: Fermi LAT Detection
  65. GRB 130502B: Fermi GBM detection of a burst
  66. GRB 130427A: Fermi-LAT refined analysis
  67. GRB 130427A: Improved Swift-XRT analysis
  68. GRB 130425: MASTER-Net optical observations
  69. GRB 130427A: Nishi-Harima NIR Observations
  70. GRB 130427B: Tentative VLT/X-shooter redshift
  71. GRB 130427A, Optical Observations
  72. GRB 130427A: Swift-XRT refined Analysis
  73. GRB 130427B: Swift-XRT refined Analysis
  74. GRB 130427A: Fermi GBM observation
  75. GRB 130427A: Fermi-LAT detection of a burst
  76. GRB 130427A: PAIRITEL NIR Detections
  77. GRB 130425A: Fermi GBM detection
  78. GRB 130420A: ROTSE-III data analysis
  79. GRB 130420B: Fermi GBM observation
  80. GRB 130420B: Swift-XRT refined Analysis
  81. GRB 130420A: Fermi GBM observation
  82. GRB 130420A: ISON-NM optical observations
  83. GRB 130420A: Swift-XRT refined Analysis
  84. GRB 130420A: PAIRITEL NIR detections
  85. GRB 130418A: Swift-XRT refined Analysis
  86. GRB 130418A: T18 and T21 optical observations
  87. GRB 130418A, Swift-BAT refined analysis
  88. GRB 130418A: REM NIR observations
  89. GRB 130418A: Swift detection of a burst with an optical counterpart
  90. GRB 130408A: Swift-XRT refined Analysis
  91. Swift/XRT observation of GRB 130327B
  92. GRB 130306A: Confirmation of the X-ray Afterglow
  93. Swift Trigger 552142 is a noise event
  94. GRB 130327B: Fermi-LAT detection of a burst
  95. GRB 130327B: Fermi GBM detection
  96. Swift Trigger 552142: a possible GRB
  97. GRB 130327A: Swift-XRT refined Analysis
  98. GRB 130327A: PAIRITEL NIR Afterglow Candidate
  99. GRB 130325A: Fermi LAT detection
  100. GRB 130325A: Fermi GBM detection

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