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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"

23463 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: ROTSE-III Optical Limits
  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: GRAS 002 optical observations
  17. Trigger 430975: Swift detection of a possible burst
  18. GRB 100805A: I-band detection from 1.23m CAHA telescope.
  19. GRB 100805A: Enhanced Swift-XRT position
  20. GRB 100805A: Further P60 Monitoring
  21. GRB 100805A: P60 Optical Afterglow Candidate
  22. GRB 100805A: ROTSE-III Optical Limits
  23. GRB 100805A: Swift detection of a burst with an optical counterpart
  24. GRB 100728B: optical photometry of ISON-NM
  25. GRB 100713A: second epoch Maidanak optical observation
  26. GRB 100713A: CrAO optical limits
  27. GRB 100802A: NOT optical observation
  28. GRB100802A: MITSuME optical upper limits
  29. GRB 100802A: P60 Observations
  30. GRB 100802A: Swift/UVOT Possible Optical Afterglow
  31. GRB 100802A: Enhanced Swift-XRT position
  32. GRB 100802A: ROTSE-III Optical Limits
  33. GRB 100802A: Swift detection of a burst
  34. GRB 100728B - NOT optical observation
  35. GRB 100728B: Swift/UVOT Observations
  36. GRB 100728B: Continued KAIT observations
  37. GRB 100728B, Swift-BAT refined analysis
  38. GRB 100728B: Swift-XRT Refined Analysis
  39. GRB 100728A: GROND Detection of the NIR Afterglow Candidate
  40. GRB 100727A: Swift/UVOT Upper Limits
  41. GRB 100728B: Enhanced Swift-XRT position
  42. GRB 100728A: Swift/UVOT Upper Limits
  43. GRB 100728B: GROND Detection of the NIR Afterglow
  44. GRB 100728B: optical detection
  45. GRB 100728B: Swift detection of a burst with an optical counterpart
  46. GRB 100728A: Enhanced Swift-XRT position
  47. GRB 100728A: Swift detection of a burst
  48. GRB 100727A: Fermi GBM observation
  49. GRB 100727A: Enhanced Swift-XRT position
  50. GRB100727A: MOA optical upper limit
  51. GRB 100727A: Swift detection of a burst
  52. GRB100725B: MITSuME optical upper limits
  53. GRB 100725B: refined XRT analysis
  54. GRB 100725A: GROND upper limits
  55. GRB 100725B: Swift/UVOT Upper Limits
  56. GRB 100725A: Swift/UVOT Upper Limits
  57. GRB 100725A: Swift-BAT refined analysis
  58. GRB 100725B: Enhanced Swift-XRT position
  59. GRB 100725A: Enhanced Swift-XRT position
  60. GRB 100725B: Swift detection of a burst
  61. GRB 100725A: Swift detection of a burst
  62. GRB 100724B: Fermi GBM detection
  63. GRB 100724A: Swift XRT refined analysis
  64. GRB 100724A: Enhanced Swift-XRT position
  65. GRB 100724A: Swift/UVOT observations
  66. GRB 100724A, GROND detection of an afterglow candidate
  67. GRB 100724A: Swift detection of a burst
  68. GRB 100614A: 10.4-m GTC deep-optical limit
  69. GRB 100722A: Fermi GBM detection
  70. GRB 100718A: MASTER-Net optical prompt and alert observations
  71. GRB 100719A: Swift detection of a burst
  72. GRB 100713A: optical observation in Maidanak
  73. GRB 100713A: Swift XRT refined analysis
  74. GRB 100713A : IRSF/SIRIUS NIR upper limits
  75. GRB100713A: Swift/UVOT observations
  76. GRB 100713A: GROND upper limits
  77. GRB 100713A: optical upper limit
  78. GRB 100713A: TNG optical observations
  79. GRB100713A: Swift X-ray afterglow detection
  80. GRB 100707A: Suzaku WAM observation of the prompt emission
  81. IPN triangulation of GRB 100707A
  82. GRB 100707A: Fermi GBM detection
  83. GRB 100628A: Chandra observations
  84. GRB 100628A: Swift XRT/UVOT refined analysis
  85. Tentative redshift of GRB100704A from Swift-XRT data
  86. IPN triangulation of GRB 100701B
  87. GRB 100704: Swift/UVOT Upper Limits
  88. GRB100704A: MOA optical upper limit
  89. GRB 100704A: Enhanced Swift-XRT position
  90. GRB 100704A: Swift detection of a burst
  91. GRB 100615A: Additional Gemini/NIRI observations
  92. GRB 100526A: Gemini/NIRI afterglow confirmation and host galaxy
  93. Swift/UVOT observations of GRB100702A
  94. GRB 100701B: Fermi GBM detection
  95. GRB 100702A: Magellan near-IR observations
  96. GRB 100702A: VLT optical observations
  97. GRB 100702: ROTSE-III Optical Limits
  98. GRB 100702A: Swift detection of a short burst
  99. GRB 100615A: Chandra X-ray ToO Observation
  100. GRB 100213B: Detection of Fading Optical Afterglow

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