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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"

27406 results found.

  1. GRB 130708A: Swift XRT and UVOT Observations
  2. GRB 130708A: Fermi GBM observation
  3. GRB 130708A found in ground analysis of Swift-BAT data
  4. GRB 130628A: Suzaku WAM observation of the prompt emission
  5. GRB130702A: NOT observation - the detection of an emerging supernova
  6. GRB 130702A: Continued RATIR Optical and NIR Observations
  7. GRB 130702A: Continued UVOT Observations
  8. GRB 130702Ð
  9. Konus-Wind observation of GRB 130702A
  10. GRB 130702A: NOT spectroscopy and redshift of the nearby bright galaxy
  11. GRB 130702A: RATIR Optical and NIR Observations
  12. GRB 130702A: NOT optical observations
  13. GRB 130702A / Fermi394416326 : Nanshan optical observations
  14. Fermi GRB 130702A: Swift XRT and UVOT observations
  15. GRB 130702A / Fermi394416326: Fermi GBM detection
  16. GRB 130702A / Fermi394416326 : Fermi-LAT detection of a burst
  17. Fermi GBM trigger 394416326: MASTER early optical limit
  18. GRB 130628A: Fermi GBM detection
  19. Fermi394416326: FTN detection
  20. Fermi394416326: iPTF detection of a possible optical afterglow
  21. GRB 130623A: Second Swift-XRT observation
  22. GRB 130701A: MITSuME Akeno Optical observation
  23. GRB 130701B: Fermi GBM detection
  24. GRB 130701A: Swift-XRT refined Analysis
  25. GRB 130701A: P60 Observations
  26. GRB 130701A, Swift-BAT refined analysis
  27. GRB 130701A: Swift/UVOT Detection
  28. GRB 130701A: Enhanced Swift-XRT position
  29. GRB 130701A: optical afterglow from the NOT
  30. GRB 130701A: Swift detection of a burst
  31. GRB 130627B, Swift-BAT refined analysis
  32. GRB 130627A, Swift-BAT refined analysis
  33. GRB 130627B: Swift/UVOT Upper Limits
  34. GRB 130627A: Swift/UVOT Upper Limits
  35. GRB 130627A: Swift-XRT refined Analysis
  36. Swift trigger 559221 is likely a false trigger coincident with IGR J17544-2619
  37. GRB 130627A: Enhanced Swift-XRT position
  38. GRB 130626A: RATIR Optical Observations
  39. GRB 130626A, Swift-BAT refined analysis
  40. GRB 130627B: Swift-XRT observations
  41. GRB 130626A: Swift-XRT possible detection and UVOT upper limits
  42. GRB 130627A: Swift-XRT observations
  43. GRB 130626A: Swift detection of a short burst
  44. GRB 130625A: Swift-XRT refined Analysis
  45. GRB 130625A: Swift/UVOT Upper Limits
  46. GRB 130625A: Nanshan optical upper limit
  47. GRB 130623A: Swift-XRT and UVOT observations
  48. GRB 130625A: Swift-BAT refined analysis
  49. GRB 130625A: Enhanced Swift-XRT position
  50. GRB 130625A: Swift detection of a burst
  51. GRB 130623A detected in ground analysis of Swift-BAT data
  52. GRB 130614A: Suzaku WAM observation of the prompt emission
  53. Swift Trigger 558631 is not a real source
  54. GRB 130612A: Swift-BAT refined analysis
  55. GRB 130609B: Suzaku WAM observation of the prompt emission
  56. GRB 130612A: Continued Skynet/PROMPT/GORT/DSO observations
  57. Trigger 558399: Swift detection of the Soft Gamma Repeater AXP 1E1547.0-5408
  58. GRB 130615A: Continued Skynet/PROMPT Observations
  59. GRB 130610A: TAROT La Silla observatory optical observations
  60. GRB 130610A: CrAO optical observations
  61. GRB 130615A: Zadko observatory - Gingin optical observations
  62. GRB 130615A: TAROT La Silla observatory optical observations
  63. GRB 130615A: Swift-XRT refined Analysis
  64. GRB 130614A: Fermi GBM detection
  65. GRB 130615A: Swift/UVOT Upper Limits
  66. GRB 130615A: Skynet/PROMPT Observations
  67. GRB 130615A: Enhanced Swift-XRT position
  68. GRB 130615A: Swift-BAT refined analysis
  69. GRB 130615A: GROND afterglow candidate
  70. GRB 130615A: Swift detection of a burst
  71. GRB 130612A: Fermi GBM observation
  72. GRB 130603B: Detection of possible afterglow/kilonova in HST observations
  73. GRB 130606B: Suzaku WAM observation of the prompt emission
  74. GRB 130612A: ISON-NM optical observations
  75. GRB 130612A: MITSuME Okayama upper limits
  76. GRB 130612A: Swift/UVOT Detection
  77. GRB 130612A: Swift-XRT refined Analysis
  78. GRB 130612A: Zadko observatory - Gingin optical observations
  79. GRB 130612A: Enhanced Swift-XRT position
  80. GRB 130612A: TAROT La Silla observatory optical observations
  81. GRB130612A OSN I-band observations
  82. GRB 130612A: RATIR Optical Observations
  83. GRB 130612A: P60 Observations
  84. GRB 130612A: Skynet/PROMPT detection of the optical afterglow
  85. GRB 130612A: PAIRITEL NIR Afterglow Observations
  86. GRB 130612A: Swift detection of a burst with an optical counterpart
  87. Recent Fermi GBM particle triggers misclassified as GRBs
  88. GRB 130609A: Swift/UVOT Upper Limits
  89. GRB 130608A: Swift/UVOT Upper Limits
  90. GRB 130609B: GROND observations
  91. GRB 130606A: CrAO optical upper limit
  92. GRB 130609B, Swift-BAT refined analysis
  93. GRB 130608A: ISON-Kislovodsk optical upper limit
  94. GRB 130610A: ISON-NM optical observations
  95. GRB 130610A: Swift/UVOT Observations
  96. GRB 130610A: Fermi GBM Observation
  97. GRB 130609B: Swift/UVOT Observations
  98. GRB 130606B: Swift/UVOT Upper Limit
  99. GRB 130610A: LOAO BVR Observation
  100. GRB 130610A: Swift-XRT refined Analysis

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