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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"

28120 results found.

  1. GRB 100805A: 2-nd epoch of SAO RAS optical observations
  2. GRB100807A: MITSuME optical upper limits
  3. GRB 100807A: Swift XRT refined analysis
  4. GRB 100807A: P60 Optical Afterglow Discovery
  5. GRB 100807A: Swift/UVOT Upper Limits
  6. GRB 100805A: SAO RAS optical observations
  7. GRB 100807A: Enhanced Swift-XRT position
  8. GRB 100807A: Swift-BAT refined analysis
  9. GRB 100807A: Swift detection of a burst
  10. GRB 100805A: IAC80 and 1.5m OSN optical observations
  11. GRB 100805A: Early RAPTOR Observations
  12. GRB 100805A: Swift/UVOT Observations of the Optical Afterglow
  13. GRB 100802A: WIYN observations
  14. GRB 100805A: IAC80 BVR-band observations
  15. GRB 100805A: Swift-BAT refined analysis
  16. GRB 100805A: Swift-XRT Refined Analysis
  17. GRB 100805A: GRAS 002 optical observations
  18. Trigger 430975: Swift detection of a possible burst
  19. GRB 100805A: I-band detection from 1.23m CAHA telescope.
  20. GRB 100805A: Enhanced Swift-XRT position
  21. GRB 100805A: Further P60 Monitoring
  22. GRB 100805A: P60 Optical Afterglow Candidate
  23. GRB 100805A: Swift detection of a burst with an optical counterpart
  24. GRB 100802A: Fermi GBM observation
  25. GRB 100728B: optical photometry of ISON-NM
  26. GRB 100713A: second epoch Maidanak optical observation
  27. GRB 100713A: CrAO optical limits
  28. GRB 100802A: NOT optical observation
  29. GRB100802A: MITSuME optical upper limits
  30. GRB 100802A: P60 Observations
  31. GRB 100802A: XRT refined analysis
  32. GRB 100802A: Swift/UVOT Possible Optical Afterglow
  33. GRB 100728A: Suzaku WAM observation of the prompt emission
  34. GRB 100802A: Enhanced Swift-XRT position
  35. GRB 100802A: Swift-BAT refined analysis
  36. GRB 100802A: Possible Swift/UVOT Detection of Optical Afterglow
  37. GRB 100802A: Swift detection of a burst
  38. GRB 100728B - NOT optical observation
  39. GRB 100728B: Swift/UVOT Observations
  40. GRB 100728B: Continued KAIT observations
  41. GRB 100728B, Swift-BAT refined analysis
  42. GRB 100728B: Swift-XRT Refined Analysis
  43. GRB 100728A: GROND Detection of the NIR Afterglow Candidate
  44. GRB 100727A: Swift/UVOT Upper Limits
  45. GRB 100728A, Swift-BAT refined analysis
  46. GRB 100728B: Enhanced Swift-XRT position
  47. GRB 100728A: Swift/UVOT Upper Limits
  48. GRB 100728A: Swift-XRT refined analysis
  49. GRB 100728B: GROND Detection of the NIR Afterglow
  50. GRB 100728B: optical detection
  51. GRB 100728B: Swift detection of a burst with an optical counterpart
  52. GRB 100728A: Enhanced Swift-XRT position
  53. GRB 100728A: Swift detection of a burst
  54. GRB 100727A: Swift XRT refined analysis
  55. GRB 100727A, Swift-BAT refined analysis
  56. GRB 100727A: Enhanced Swift-XRT position
  57. GRB 100727A: Swift detection of a burst
  58. GRB100725B: MITSuME optical upper limits
  59. GRB 100724B: AGILE/GRID analysis
  60. GRB 100724B: Suzaku WAM observation of the prompt emission
  61. GRB 100724B: gamma-ray detection by AGILE
  62. GRB 100725B: Swift-BAT refined analysis
  63. GRB 100725B: refined XRT analysis
  64. GRB 100725A: GROND upper limits
  65. GRB 100725B: Swift/UVOT Upper Limits
  66. GRB 100725A: Swift/UVOT Upper Limits
  67. GRB 100725A: Swift-BAT refined analysis
  68. GRB 100725A: Swift XRT refined analysis
  69. GRB 100725B: Enhanced Swift-XRT position
  70. GRB 100725A: Enhanced Swift-XRT position
  71. GRB 100725B: Swift detection of a burst
  72. GRB 100725A: Swift detection of a burst
  73. GRB 100724B: Fermi GBM detection
  74. GRB 100724A: Swift XRT refined analysis
  75. GRB 100724A: Enhanced Swift-XRT position
  76. GRB 100724A: Swift/UVOT observations
  77. GRB 100724A: Swift-BAT refined analysis
  78. GRB 100724A: Swift detection of a burst
  79. GRB 100614A: 10.4-m GTC deep-optical limit
  80. GRB 100722A: Fermi GBM detection
  81. GRB 100718A: MASTER-Net optical prompt and alert observations
  82. GRB 100719A: Swift-BAT refined analysis
  83. GRB 100713A: optical observation in Maidanak
  84. GRB 100713A: Swift XRT refined analysis
  85. GRB 100713A: GROND upper limits
  86. GRB 100713A: TNG optical observations
  87. GRB100713A: Swift X-ray afterglow detection
  88. GRB 100713A: a long GRB detected by INTEGRAL
  89. GRB 100707A: Suzaku WAM observation of the prompt emission
  90. GRB 100707A: Fermi LAT detection
  91. GRB 100707A: Fermi GBM detection
  92. GRB 100628A: Chandra observations
  93. Tentative redshift of GRB100704A from Swift-XRT data
  94. GRB 100704A: Swift XRT refined analysis
  95. GRB 100704: Swift/UVOT Upper Limits
  96. GRB 100704A: Fermi GBM observation
  97. GRB 100704A: Swift-BAT refined analysis
  98. GRB 100704A: Enhanced Swift-XRT position
  99. GRB 100704A: Swift detection of a burst
  100. GRB 100615A: Additional Gemini/NIRI observations

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