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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"

36143 results found.

  1. GRB 110319A: Swift detection of a burst
  2. GRB 110318B: Swift-XRT refined Analysis
  3. GRB 110318A: Fermi GBM detection
  4. GRB 110318B: Swift-BAT refined analysis
  5. GRB 110318B: Enhanced Swift-XRT position
  6. GRB 110318A: Swift-BAT refined analysis
  7. GRB 110318B: Swift/UVOT Non-Detection of an Afterglow
  8. GRB 110318B: Swift detection of a burst
  9. GRB 110318A: Swift detection of a burst
  10. Fermi GBM trigger 321944155 (110316205) is not a GRB
  11. GRB 110315A: RTT150 optical observations
  12. GRB 110315A: Swift/UVOT Upper Limits
  13. GRB 110315A: Swift-XRT refined Analysis
  14. GRB 110315A: Swift-BAT refined analysis
  15. GRB 110315A: Enhanced Swift-XRT position
  16. GRB 110315A: MASTER early optical observations
  17. GRB 110315A: Swift detection of a burst
  18. GRB110312A: MITSuME Okayama Optical upper limits
  19. GRB 110312A: RTT150 optical observations
  20. GRB 110312A: Swift/UVOT Upper Limits
  21. GRB 110312A: Swift-XRT refined Analysis
  22. GRB 110312A: GROND Upper Limits
  23. GRB 110312A: Enhanced Swift-XRT position
  24. GRB 110312A: Swift-BAT refined analysis
  25. GRB 110312A: Swift detection of a burst
  26. GRB 110305A: REM detection of a possible NIR afterglow
  27. GRB110305A: MITSuME Ishigakijima Optical upper limits
  28. GRB 110305A: Swift/UVOT Upper Limits
  29. GRB 110305A: Swift-XRT refined Analysis
  30. GRB 110305A: Enhanced Swift-XRT position
  31. GRB 110305A: Swift-BAT refined analysis
  32. IBAS trigger n. 6138 is not a GRB
  33. GRB 110305A: GROND Detection of Optical Afterglow
  34. GRB 110305A: Swift detection of a burst
  35. GRB 110223A: optical upper limits
  36. GRB 110301A: Fermi GBM detection
  37. GRB101225A: early EVLA Observations of Christmas Burst
  38. Swift/UVOT observations of GRB110223A
  39. No IPN GRB detected in conjunction with candidate GRB 110215
  40. GRB GRB 110223A: MASTER VWF early optical observations
  41. IBAS distribution of coordinates for low significance INTEGRAL GRB triggers
  42. GRB 110223A: Swift-BAT refined analysis
  43. GRB 110223A : early optical limit by "Pi of the Sky"
  44. GRB 110223A: Liverpool Telescope observations
  45. GRB 110223A: Swift-XRT refined Analysis
  46. GRB 110223B: Swift-XRT refined Analysis
  47. GRB 110223A: Enhanced Swift-XRT position
  48. GRB 110223B: Enhanced Swift-XRT position
  49. GRB 110223B: Swift-BAT refined analysis
  50. GRB 110223B: GROND Detection of Optical Afterglow Candidate
  51. GRB 110223A: Observations from BOOTES-2
  52. GRB 110223B: Swift detection of a burst
  53. GRB 110223A: Swift detection of a burst
  54. GRB 101225A, the review of the sky area in plate archives
  55. OT 110215: Further NIR observations from NOT of the GRB candidate
  56. GRB 110213B: Swift/UVOT observations
  57. GRB110213B: X-ray afterglow confirmation
  58. Swift XRT and UVOT Observations of OT 110215
  59. OT 110215: NIR observations from NOT of GRB candidate
  60. GRB 110213A: optical observations in CrAO
  61. GRB 110213B: GROND observations of the optical/NIR afterglow
  62. GRB 110213A: optical observations in Mondy
  63. Fermi GBM trigger 319534757 (110216319) is not a GRB
  64. GRB110205A: EVLA Observations
  65. OT 110215: possible GRB from 2MASS J00264184+8324093
  66. Swift/UVOT observations of GRB110210a.
  67. GRB 110210A: optical upper limit
  68. GRB 110213B: Gemini South Redshift
  69. GRB 110213B: Possible Host Galaxy in SDSS Stripe 82 Imaging
  70. GRB 110210A: ROVOR Upper Limit
  71. GRB 110213A: YNAO-GMG Observations
  72. GRB 110213B: P60 Optical Afterglow Candidate
  73. GRB 110213A: TNT optical observations
  74. GRB 110212A: Swift XRT and UVOT observations
  75. GRB 110213A: Fermi GBM observation
  76. GRB 110205A: Konkoly optical observations
  77. GRB 110213B: Swift XRT observation
  78. GRB 110213A: MITSuME Akeno Optical Observation
  79. Konus-Wind observation of GRB 110213A
  80. Konus-Wind observation of GRB 110213B
  81. GRB 110213A: Swift-XRT refined Analysis
  82. GRB 110213B: MAXI/GSC refined analysis
  83. GRB110213A: MITSuME Okayama Optical Observation
  84. GRB 110213A: Swift/UVOT refined analysis
  85. GRB 110213A: THO optical observations
  86. GRB 110213B: MAXI/GSC detection of a probable GRB
  87. GRB 110213A: Lightbuckets Optical Observations
  88. GRB 110213A, Swift-BAT refined analysis
  89. GRB 110213A: optical observations
  90. GRB 110213A: Enhanced Swift-XRT position
  91. GRB110212A: MITSuME Okayama optical upper limits
  92. GRB 110213A: KAIT observations
  93. GRB 110213A: GRAS011 optical observations
  94. GRB 110213A: Bok Telescope Redshift
  95. GRB 110213A: ROTSE-III Detection of Optical Counterpart
  96. GRB 110213A: P60 Optical Afterglow Detection
  97. GRB 110213A: Swift detection of a burst with optical afterglow
  98. GRB 110212A: GRT Optical Observation
  99. GRB 110212A, Swift-BAT refined analysis
  100. GRB 110212A: SARA-N Optical Limits

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