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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"

20506 results found.

  1. GRB 100816A: Swift detection of a possibly short burst with optical afterglow
  2. GRB 100814A: Submm observations from APEX
  3. Swift/UVOT observations of GRB100814A
  4. GRB 100814A, Swift-BAT refined analysis
  5. GRB 100814A: Enhanced Swift-XRT position
  6. GRB 100814A: GROND Detection of the Optical/NIR Afterglow
  7. GRB 100814A: Swift detection of a burst with an optical afterglow
  8. GRB 100805A: the 4-th epoch of SAO RAS optical observations
  9. GRB 100805A: optical observation in CrAO (correction to the GCN 11077 and second epoch)
  10. GRB 100802A: further NOT observation
  11. GRB 100807A: P200 Infrared Observations
  12. GRB 100805A: the 3-rd epoch of SAO RAS optical observations
  13. GRB100807A: optical observation in CrAO
  14. GRB 100805A: optical observation in CrAO
  15. GRB 100805A: 2-nd epoch of SAO RAS optical observations
  16. GRB100807A: MITSuME optical upper limits
  17. GRB 100807A: P60 Optical Afterglow Discovery
  18. GRB 100807A: Swift/UVOT Upper Limits
  19. GRB 100805A: SAO RAS optical observations
  20. GRB 100807A: Enhanced Swift-XRT position
  21. GRB 100807A: Swift detection of a burst
  22. GRB 100805A: IAC80 and 1.5m OSN optical observations
  23. GRB 100805A: Early RAPTOR Observations
  24. GRB 100805A: Swift/UVOT Observations of the Optical Afterglow
  25. GRB 100802A: WIYN observations
  26. GRB 100805A: IAC80 BVR-band observations
  27. GRB 100805A: GRAS 002 optical observations
  28. Trigger 430975: Swift detection of a possible burst
  29. GRB 100805A: I-band detection from 1.23m CAHA telescope.
  30. GRB 100805A: Enhanced Swift-XRT position
  31. GRB 100805A: Further P60 Monitoring
  32. GRB 100805A: P60 Optical Afterglow Candidate
  33. GRB 100805A: Swift detection of a burst with an optical counterpart
  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: Swift/UVOT Possible Optical Afterglow
  41. GRB 100802A: Enhanced Swift-XRT position
  42. GRB 100802A: Swift detection of a burst
  43. GRB 100728B - NOT optical observation
  44. GRB 100728B: Swift/UVOT Observations
  45. GRB 100728B: Continued KAIT observations
  46. GRB 100728B, Swift-BAT refined analysis
  47. Konus-Wind observation of GRB 100728A
  48. GRB 100728A: GROND Detection of the NIR Afterglow Candidate
  49. GRB 100727A: Swift/UVOT Upper Limits
  50. GRB 100728B: Enhanced Swift-XRT position
  51. GRB 100728A: Swift/UVOT Upper Limits
  52. GRB 100728B: GROND Detection of the NIR Afterglow
  53. GRB 100728B: optical detection
  54. GRB 100728B: Swift detection of a burst with an optical counterpart
  55. GRB 100728A: Enhanced Swift-XRT position
  56. GRB 100728A: Swift detection of a burst
  57. GRB 100727A: Enhanced Swift-XRT position
  58. GRB 100727A: Swift detection of a burst
  59. GRB100725B: MITSuME optical upper limits
  60. GRB 100724B: Suzaku WAM observation of the prompt emission
  61. GRB 100724B: gamma-ray detection by AGILE
  62. GRB 100725A: GROND upper limits
  63. GRB 100725B: Swift/UVOT Upper Limits
  64. GRB 100725A: Swift/UVOT Upper Limits
  65. GRB 100725A: Swift XRT refined analysis
  66. GRB 100725B: Enhanced Swift-XRT position
  67. GRB 100725A: Enhanced Swift-XRT position
  68. GRB 100725B: Swift detection of a burst
  69. Konus-Wind observation of GRB 100724B
  70. GRB 100725A: Swift detection of a burst
  71. GRB 100724A: Enhanced Swift-XRT position
  72. GRB 100724A: Swift/UVOT observations
  73. GRB 100724A: Swift detection of a burst
  74. GRB 100614A: 10.4-m GTC deep-optical limit
  75. GRB 100718A: MASTER-Net optical prompt and alert observations
  76. GRB 100713A: optical observation in Maidanak
  77. GRB 100713A: Swift XRT refined analysis
  78. GRB 100713A: GROND upper limits
  79. GRB 100713A: TNG optical observations
  80. GRB100713A: Swift X-ray afterglow detection
  81. GRB 100628A: Chandra observations
  82. GRB 100704: Swift/UVOT Upper Limits
  83. GRB100704A: MOA optical upper limit
  84. GRB 100704A: Enhanced Swift-XRT position
  85. GRB 100704A: Swift detection of a burst
  86. GRB 100615A: Additional Gemini/NIRI observations
  87. GRB 100526A: Gemini/NIRI afterglow confirmation and host galaxy
  88. Swift/UVOT observations of GRB100702A
  89. GRB 100702A: Second epoch of Magellan near-IR observations and afterglow limits
  90. GRB 100702A: Magellan near-IR observations
  91. GRB 100702A: VLT optical observations
  92. GRB 100702: ROTSE-III Optical Limits
  93. GRB 100702A: Swift detection of a short burst
  94. GRB 100615A: Chandra X-ray ToO Observation
  95. XRF 100701A : MAXI/GSC detection of a probable XRF
  96. GRB 100213B: Detection of Fading Optical Afterglow
  97. GRB 100628A: GROND optical/NIR observations of the host candidate
  98. GRB 100628A: Gemini North Observations
  99. GRB100625A: GROND confirmation of constant source
  100. GRB 090709A: Host galaxy detection

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