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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"
  1. GRB110318B : MOA optical upper limit
  2. Fermi Gamma-ray Burst Monitor trigger 322686470 (110324797) is not a GRB
  3. GRB 110319B Swift-XRT afterglow confirmation
  4. GRB 101225A: revised analysis of narrow band imaging
  5. GRB 110319B BAT refined analysis
  6. GRB 110319B: Swift/UVOT Upper Limits
  7. GRB 110318B: Swift/UVOT Upper Limits
  8. GRB 110319B: GROND upper limits
  9. GRB 110319B: Swift-XRT afterglow candidate.
  10. GRB 110319B found in ground analysis of Swift-BAT data
  11. GRB 110319A: Swift/UVOT Detection
  12. GRB 110319A: Swift-BAT refined analysis
  13. GRB 110319A: Swift-XRT refined Analysis
  14. GRB 110318B: GROND upper limits
  15. GRB 110319A: Enhanced Swift-XRT position
  16. GRB 110319A: Swift detection of a burst
  17. GRB 110318B: Swift-XRT refined Analysis
  18. GRB 110318A: Fermi GBM detection
  19. GRB 110318B: Swift-BAT refined analysis
  20. GRB 110318B: Enhanced Swift-XRT position
  21. GRB 110318A: Swift-BAT refined analysis
  22. GRB 110318B: Swift/UVOT Non-Detection of an Afterglow
  23. GRB 110318B: Swift detection of a burst
  24. GRB 110318A: Swift detection of a burst
  25. Fermi GBM trigger 321944155 (110316205) is not a GRB
  26. GRB 110315A: RTT150 optical observations
  27. GRB 110315A: Swift/UVOT Upper Limits
  28. GRB 110315A: Swift-XRT refined Analysis
  29. GRB 110315A: Swift-BAT refined analysis
  30. GRB 110315A: Enhanced Swift-XRT position
  31. GRB 110315A: MASTER early optical observations
  32. GRB 110315A: Swift detection of a burst
  33. GRB110312A: MITSuME Okayama Optical upper limits
  34. GRB 110312A: RTT150 optical observations
  35. GRB 110312A: Swift/UVOT Upper Limits
  36. GRB 110312A: Swift-XRT refined Analysis
  37. GRB 110312A: GROND Upper Limits
  38. GRB 110312A: Enhanced Swift-XRT position
  39. GRB 110312A: Swift-BAT refined analysis
  40. GRB 110312A: Swift detection of a burst
  41. GRB 110305A: REM detection of a possible NIR afterglow
  42. GRB110305A: MITSuME Ishigakijima Optical upper limits
  43. GRB 110305A: Swift/UVOT Upper Limits
  44. GRB 110305A: Swift-XRT refined Analysis
  45. GRB 110305A: Enhanced Swift-XRT position
  46. GRB 110305A: Swift-BAT refined analysis
  47. IBAS trigger n. 6138 is not a GRB
  48. GRB 110305A: GROND Detection of Optical Afterglow
  49. GRB 110305A: Swift detection of a burst
  50. GRB 110223A: optical upper limits
  51. GRB 110301A: Fermi GBM detection
  52. GRB101225A: early EVLA Observations of Christmas Burst
  53. Swift/UVOT observations of GRB110223A
  54. No IPN GRB detected in conjunction with candidate GRB 110215
  55. GRB GRB 110223A: MASTER VWF early optical observations
  56. IBAS distribution of coordinates for low significance INTEGRAL GRB triggers
  57. Swift/UVOT observations of GRB110223b
  58. GRB 110223A: Swift-BAT refined analysis
  59. GRB 110223A : early optical limit by "Pi of the Sky"
  60. GRB 110223A: Liverpool Telescope observations
  61. GRB 110223A: Swift-XRT refined Analysis
  62. GRB 110223B: Swift-XRT refined Analysis
  63. GRB 110223A: Enhanced Swift-XRT position
  64. GRB 110223B: Enhanced Swift-XRT position
  65. GRB 110223B: Swift-BAT refined analysis
  66. GRB 110223B: GROND Detection of Optical Afterglow Candidate
  67. GRB 110223A: Observations from BOOTES-2
  68. GRB 110223B: Swift detection of a burst
  69. GRB 110223A: Swift detection of a burst
  70. GRB 101225A, the review of the sky area in plate archives
  71. OT 110215: Further NIR observations from NOT of the GRB candidate
  72. GRB 110213B: Swift/UVOT observations
  73. GRB110213B: X-ray afterglow confirmation
  74. Fermi GBM detection of an SGR-like burst
  75. Swift XRT and UVOT Observations of OT 110215
  76. OT 110215: NIR observations from NOT of GRB candidate
  77. GRB 110213A: optical observations in CrAO
  78. GRB 110213B: GROND observations of the optical/NIR afterglow
  79. GRB 110213A: optical observations in Mondy
  80. Fermi GBM trigger 319534757 (110216319) is not a GRB
  81. GRB110205A: EVLA Observations
  82. OT 110215: possible GRB from 2MASS J00264184+8324093
  83. Swift/UVOT observations of GRB110210a.
  84. GRB 110210A: optical upper limit
  85. GRB 110213B: Gemini South Redshift
  86. GRB 110213B: Possible Host Galaxy in SDSS Stripe 82 Imaging
  87. GRB 110210A: ROVOR Upper Limit
  88. GRB 110213A: YNAO-GMG Observations
  89. GRB 110213B: P60 Optical Afterglow Candidate
  90. GRB 110213A: TNT optical observations
  91. GRB110213A: RAPTOR Early Optical Peak and Plateau Measurements
  92. GRB 110212A: Swift XRT and UVOT observations
  93. Swift GRB110213A: interesting behaviour
  94. GRB 110213A: Fermi GBM observation
  95. GRB 110205A: Konkoly optical observations
  96. GRB 110213B: Swift XRT observation
  97. GRB 110213A: MITSuME Akeno Optical Observation
  98. Konus-Wind observation of GRB 110213A
  99. Konus-Wind observation of GRB 110213B
  100. GRB 110213A: Swift-XRT refined Analysis

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