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GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. 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"

28261 results found.

  1. GRB 100823A: WHT observations
  2. GRB 100823A: Swift-BAT refined analysis
  3. GRB 100823A: Enhanced Swift-XRT position
  4. GRB 100823A: Swift detection of a burst
  5. GRB 100814A: Suzaku WAM observation of the prompt emission
  6. GRB 100814B: Fermi GBM detection
  7. GRB 100814A: optical observations
  8. GRB100816A: MITSuME optical upper limits
  9. GRB 100814A: NOT optical observations
  10. GRB 100816A: NOT optical observations
  11. GRB 100814A : Lulin optical observation
  12. GRB 100816A : Lulin r'-band observation
  13. GRB 100816A: Swift UVOT Observations
  14. GRB100816A Swift-XRT refined analysis
  15. GRB 100816A: Swift-BAT spectral lag results
  16. GRB 100816A: 1.23m CAHA optical observations
  17. GRB 100816A, Swift-BAT refined analysis
  18. GRB 100816A: Enhanced Swift-XRT position
  19. GRB 100816A: Gemini-N imaging
  20. GRB 100816A: TAROT Calern observatory optical detection
  21. GRB 100816A: MASTER Optical Limits
  22. GRB100816A: TNG optical afterglow confirmation.
  23. GRB 100816A: Swift detection of a possibly short burst with optical afterglow
  24. GRB 100814A: Fermi GBM observation
  25. GRB 100814A: Submm observations from APEX
  26. GRB 100814A: Swift-XRT refined analysis
  27. Swift/UVOT observations of GRB100814A
  28. GRB 100814A, Swift-BAT refined analysis
  29. GRB 100814A: Enhanced Swift-XRT position
  30. GRB 100814A: GROND Detection of the Optical/NIR Afterglow
  31. GRB 100814A: Swift UVOT observations of the optical afterglow
  32. GRB 100814A: Swift detection of a burst with an optical afterglow
  33. GRB 100814A: ROTSE-III Detection of Optical Counterpart
  34. GRB 100805A: the 4-th epoch of SAO RAS optical observations
  35. GRB 100805A: optical observation in CrAO (correction to the GCN 11077 and second epoch)
  36. GRB 100802A: further NOT observation
  37. GRB 100805A: Swift/UVOT Observations of a Possible Late-Time Brightening
  38. GRB 100807A: P200 Infrared Observations
  39. GRB 100805A: the 3-rd epoch of SAO RAS optical observations
  40. GRB100807A: optical observation in CrAO
  41. GRB 100805A: optical observation in CrAO
  42. GRB 100805A: 2-nd epoch of SAO RAS optical observations
  43. GRB100807A: MITSuME optical upper limits
  44. GRB 100807A: Swift XRT refined analysis
  45. GRB 100807A: P60 Optical Afterglow Discovery
  46. GRB 100807A: Swift/UVOT Upper Limits
  47. GRB 100805A: SAO RAS optical observations
  48. GRB 100807A: Enhanced Swift-XRT position
  49. GRB 100807A: Swift-BAT refined analysis
  50. GRB 100807A: Swift detection of a burst
  51. GRB 100805A: IAC80 and 1.5m OSN optical observations
  52. GRB 100805A: Early RAPTOR Observations
  53. GRB 100805A: Swift/UVOT Observations of the Optical Afterglow
  54. GRB 100802A: WIYN observations
  55. GRB 100805A: IAC80 BVR-band observations
  56. GRB 100805A: Swift-BAT refined analysis
  57. GRB 100805A: Swift-XRT Refined Analysis
  58. GRB 100805A: GRAS 002 optical observations
  59. Trigger 430975: Swift detection of a possible burst
  60. GRB 100805A: I-band detection from 1.23m CAHA telescope.
  61. GRB 100805A: Enhanced Swift-XRT position
  62. GRB 100805A: Further P60 Monitoring
  63. GRB 100805A: P60 Optical Afterglow Candidate
  64. GRB 100805A: Swift detection of a burst with an optical counterpart
  65. GRB 100802A: Fermi GBM observation
  66. GRB 100728B: optical photometry of ISON-NM
  67. GRB 100713A: second epoch Maidanak optical observation
  68. GRB 100713A: CrAO optical limits
  69. GRB 100802A: NOT optical observation
  70. GRB100802A: MITSuME optical upper limits
  71. GRB 100802A: P60 Observations
  72. GRB 100802A: XRT refined analysis
  73. GRB 100802A: Swift/UVOT Possible Optical Afterglow
  74. GRB 100728A: Suzaku WAM observation of the prompt emission
  75. GRB 100802A: Enhanced Swift-XRT position
  76. GRB 100802A: Swift-BAT refined analysis
  77. GRB 100802A: Possible Swift/UVOT Detection of Optical Afterglow
  78. GRB 100802A: Swift detection of a burst
  79. GRB 100728B - NOT optical observation
  80. GRB 100728B: Swift/UVOT Observations
  81. GRB 100728B: Continued KAIT observations
  82. GRB 100728B, Swift-BAT refined analysis
  83. GRB 100728B: Swift-XRT Refined Analysis
  84. GRB 100728A: GROND Detection of the NIR Afterglow Candidate
  85. GRB 100727A: Swift/UVOT Upper Limits
  86. GRB 100728A, Swift-BAT refined analysis
  87. GRB 100728B: Enhanced Swift-XRT position
  88. GRB 100728A: Swift/UVOT Upper Limits
  89. GRB 100728A: Swift-XRT refined analysis
  90. GRB 100728B: GROND Detection of the NIR Afterglow
  91. GRB 100728B: optical detection
  92. GRB 100728B: Swift detection of a burst with an optical counterpart
  93. GRB 100728A: Enhanced Swift-XRT position
  94. GRB 100728A: Swift detection of a burst
  95. GRB 100727A: Swift XRT refined analysis
  96. GRB 100727A, Swift-BAT refined analysis
  97. GRB 100727A: Enhanced Swift-XRT position
  98. GRB 100727A: Swift detection of a burst
  99. GRB100725B: MITSuME optical upper limits
  100. GRB 100724B: AGILE/GRID analysis

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