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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"

22912 results found.

  1. GRB 100901A - NOT optical observation
  2. GRB 100901A: Enhanced Swift-XRT position
  3. GRB 100901A: Swift detection of a burst with an optical afterglow
  4. GRB 100829.9: MASTER Optical Limits
  5. IPN triangulation of GRB 100826A
  6. GRB 100823A: optical upper limit
  7. GRB 100814A: Maidanak optical observations
  8. GRB 100823A: optical observations
  9. GRB 100725B: Mondy optical upper limit
  10. GRB 100725B: Maidanak optical upper limit
  11. GRB100807A: R band observations
  12. GRB 100823A - second epoch WHT observations
  13. GRB 100823A: TNG NIR observations
  14. GRB 100823A: Swift/UVOT Upper Limits
  15. GRB 100823A: WHT observations
  16. GRB 100823A: Enhanced Swift-XRT position
  17. GRB 100823A: Swift detection of a burst
  18. GRB 100814B: Fermi GBM detection
  19. GRB 100814A: optical observations
  20. GRB100816A: MITSuME optical upper limits
  21. GRB 100814A: NOT optical observations
  22. GRB 100816A: NOT optical observations
  23. GRB 100814A : Lulin optical observation
  24. GRB 100816A : Lulin r'-band observation
  25. GRB 100816A: Swift UVOT Observations
  26. GRB100816A Swift-XRT refined analysis
  27. GRB 100816A: Swift-BAT spectral lag results
  28. GRB 100816A: 1.23m CAHA optical observations
  29. GRB 100816A: Enhanced Swift-XRT position
  30. GRB 100816A: Gemini-N imaging
  31. GRB 100816A: TAROT Calern observatory optical detection
  32. GRB 100816A: MASTER Optical Limits
  33. GRB100816A: TNG optical afterglow confirmation.
  34. GRB 100816A: ROTSE-III Optical Limits
  35. GRB 100816A: Swift detection of a possibly short burst with optical afterglow
  36. GRB 100814A: Submm observations from APEX
  37. Swift/UVOT Observations of GRB100814A - a clearer table.
  38. Swift/UVOT observations of GRB100814A
  39. GRB 100814A, Swift-BAT refined analysis
  40. GRB 100814A: Enhanced Swift-XRT position
  41. GRB 100814A: GROND Detection of the Optical/NIR Afterglow
  42. GRB 100814A: Swift detection of a burst with an optical afterglow
  43. GRB 100805A: the 4-th epoch of SAO RAS optical observations
  44. GRB 100805A: optical observation in CrAO (correction to the GCN 11077 and second epoch)
  45. GRB 100802A: further NOT observation
  46. GRB 100807A: P200 Infrared Observations
  47. GRB 100805A: the 3-rd epoch of SAO RAS optical observations
  48. GRB100807A: optical observation in CrAO
  49. GRB 100805A: optical observation in CrAO
  50. GRB 100805A: 2-nd epoch of SAO RAS optical observations
  51. GRB100807A: MITSuME optical upper limits
  52. GRB 100807A: Swift XRT refined analysis
  53. GRB 100807A: P60 Optical Afterglow Discovery
  54. GRB 100807A: Swift/UVOT Upper Limits
  55. GRB 100805A: SAO RAS optical observations
  56. GRB 100807A: Enhanced Swift-XRT position
  57. GRB 100807A: ROTSE-III Optical Limits
  58. GRB 100807A: Swift detection of a burst
  59. GRB 100805A: IAC80 and 1.5m OSN optical observations
  60. GRB 100805A: Early RAPTOR Observations
  61. GRB 100805A: Swift/UVOT Observations of the Optical Afterglow
  62. GRB 100802A: WIYN observations
  63. GRB 100805A: IAC80 BVR-band observations
  64. GRB 100805A: Swift-BAT refined analysis
  65. GRB 100805A: GRAS 002 optical observations
  66. Trigger 430975: Swift detection of a possible burst
  67. GRB 100805A: I-band detection from 1.23m CAHA telescope.
  68. GRB 100805A: Enhanced Swift-XRT position
  69. GRB 100805A: Further P60 Monitoring
  70. GRB 100805A: P60 Optical Afterglow Candidate
  71. GRB 100805A: ROTSE-III Optical Limits
  72. GRB 100805A: Swift detection of a burst with an optical counterpart
  73. GRB 100728B: optical photometry of ISON-NM
  74. GRB 100713A: second epoch Maidanak optical observation
  75. GRB 100713A: CrAO optical limits
  76. GRB 100802A: NOT optical observation
  77. GRB100802A: MITSuME optical upper limits
  78. GRB 100802A: P60 Observations
  79. GRB 100802A: Swift/UVOT Possible Optical Afterglow
  80. GRB 100802A: Enhanced Swift-XRT position
  81. GRB 100802A: ROTSE-III Optical Limits
  82. GRB 100802A: Swift detection of a burst
  83. GRB 100728B - NOT optical observation
  84. GRB 100728B: Swift/UVOT Observations
  85. GRB 100728B: Continued KAIT observations
  86. GRB 100728B, Swift-BAT refined analysis
  87. GRB 100728B: Swift-XRT Refined Analysis
  88. GRB 100728A: GROND Detection of the NIR Afterglow Candidate
  89. GRB 100727A: Swift/UVOT Upper Limits
  90. GRB 100728B: Enhanced Swift-XRT position
  91. GRB 100728A: Swift/UVOT Upper Limits
  92. GRB 100728B: GROND Detection of the NIR Afterglow
  93. GRB 100728B: optical detection
  94. GRB 100728B: Swift detection of a burst with an optical counterpart
  95. GRB 100728A: Enhanced Swift-XRT position
  96. GRB 100728A: Swift detection of a burst
  97. GRB 100727A: Fermi GBM observation
  98. GRB 100727A: Enhanced Swift-XRT position
  99. GRB100727A: MOA optical upper limit
  100. GRB 100727A: Swift detection of a burst

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