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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"

28229 results found.

  1. GRB 100814A: ROTSE-III Detection of Optical Counterpart
  2. GRB 100805A: the 4-th epoch of SAO RAS optical observations
  3. GRB 100805A: optical observation in CrAO (correction to the GCN 11077 and second epoch)
  4. GRB 100802A: further NOT observation
  5. GRB 100805A: Swift/UVOT Observations of a Possible Late-Time Brightening
  6. GRB 100807A: P200 Infrared Observations
  7. GRB 100805A: the 3-rd epoch of SAO RAS optical observations
  8. GRB100807A: optical observation in CrAO
  9. GRB 100805A: optical observation in CrAO
  10. GRB 100805A: 2-nd epoch of SAO RAS optical observations
  11. GRB100807A: MITSuME optical upper limits
  12. GRB 100807A: Swift XRT refined analysis
  13. GRB 100807A: P60 Optical Afterglow Discovery
  14. GRB 100807A: Swift/UVOT Upper Limits
  15. GRB 100805A: SAO RAS optical observations
  16. GRB 100807A: Enhanced Swift-XRT position
  17. GRB 100807A: Swift-BAT refined analysis
  18. GRB 100807A: Swift detection of a burst
  19. GRB 100805A: IAC80 and 1.5m OSN optical observations
  20. GRB 100805A: Early RAPTOR Observations
  21. GRB 100805A: Swift/UVOT Observations of the Optical Afterglow
  22. GRB 100802A: WIYN observations
  23. GRB 100805A: IAC80 BVR-band observations
  24. GRB 100805A: Swift-BAT refined analysis
  25. GRB 100805A: Swift-XRT Refined Analysis
  26. GRB 100805A: GRAS 002 optical observations
  27. Trigger 430975: Swift detection of a possible burst
  28. GRB 100805A: I-band detection from 1.23m CAHA telescope.
  29. GRB 100805A: Enhanced Swift-XRT position
  30. GRB 100805A: Further P60 Monitoring
  31. GRB 100805A: P60 Optical Afterglow Candidate
  32. GRB 100805A: Swift detection of a burst with an optical counterpart
  33. GRB 100802A: Fermi GBM observation
  34. GRB 100728B: optical photometry of ISON-NM
  35. GRB 100713A: second epoch Maidanak optical observation
  36. GRB 100713A: CrAO optical limits
  37. GRB 100802A: NOT optical observation
  38. GRB100802A: MITSuME optical upper limits
  39. GRB 100802A: P60 Observations
  40. GRB 100802A: XRT refined analysis
  41. GRB 100802A: Swift/UVOT Possible Optical Afterglow
  42. GRB 100728A: Suzaku WAM observation of the prompt emission
  43. GRB 100802A: Enhanced Swift-XRT position
  44. GRB 100802A: Swift-BAT refined analysis
  45. GRB 100802A: Possible Swift/UVOT Detection of Optical Afterglow
  46. GRB 100802A: Swift detection of a burst
  47. GRB 100728B - NOT optical observation
  48. GRB 100728B: Swift/UVOT Observations
  49. GRB 100728B: Continued KAIT observations
  50. GRB 100728B, Swift-BAT refined analysis
  51. GRB 100728B: Swift-XRT Refined Analysis
  52. GRB 100728A: GROND Detection of the NIR Afterglow Candidate
  53. GRB 100727A: Swift/UVOT Upper Limits
  54. GRB 100728A, Swift-BAT refined analysis
  55. GRB 100728B: Enhanced Swift-XRT position
  56. GRB 100728A: Swift/UVOT Upper Limits
  57. GRB 100728A: Swift-XRT refined analysis
  58. GRB 100728B: GROND Detection of the NIR Afterglow
  59. GRB 100728B: optical detection
  60. GRB 100728B: Swift detection of a burst with an optical counterpart
  61. GRB 100728A: Enhanced Swift-XRT position
  62. GRB 100728A: Swift detection of a burst
  63. GRB 100727A: Swift XRT refined analysis
  64. GRB 100727A, Swift-BAT refined analysis
  65. GRB 100727A: Enhanced Swift-XRT position
  66. GRB 100727A: Swift detection of a burst
  67. GRB100725B: MITSuME optical upper limits
  68. GRB 100724B: AGILE/GRID analysis
  69. GRB 100724B: Suzaku WAM observation of the prompt emission
  70. GRB 100724B: gamma-ray detection by AGILE
  71. GRB 100725B: Swift-BAT refined analysis
  72. GRB 100725B: refined XRT analysis
  73. GRB 100725A: GROND upper limits
  74. GRB 100725B: Swift/UVOT Upper Limits
  75. GRB 100725A: Swift/UVOT Upper Limits
  76. GRB 100725A: Swift-BAT refined analysis
  77. GRB 100725A: Swift XRT refined analysis
  78. GRB 100725B: Enhanced Swift-XRT position
  79. GRB 100725A: Enhanced Swift-XRT position
  80. GRB 100725B: Swift detection of a burst
  81. GRB 100725A: Swift detection of a burst
  82. GRB 100724B: Fermi GBM detection
  83. GRB 100724A: Swift XRT refined analysis
  84. GRB 100724A: Enhanced Swift-XRT position
  85. GRB 100724A: Swift/UVOT observations
  86. GRB 100724A: Swift-BAT refined analysis
  87. GRB 100724A: Swift detection of a burst
  88. GRB 100614A: 10.4-m GTC deep-optical limit
  89. GRB 100722A: Fermi GBM detection
  90. GRB 100718A: MASTER-Net optical prompt and alert observations
  91. GRB 100719A: Swift-BAT refined analysis
  92. GRB 100713A: optical observation in Maidanak
  93. GRB 100713A: Swift XRT refined analysis
  94. GRB 100713A: GROND upper limits
  95. GRB 100713A: TNG optical observations
  96. GRB100713A: Swift X-ray afterglow detection
  97. GRB 100713A: a long GRB detected by INTEGRAL
  98. GRB 100707A: Suzaku WAM observation of the prompt emission
  99. GRB 100707A: Fermi LAT detection
  100. GRB 100707A: Fermi GBM detection

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