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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"

18503 results found.

  1. GRB 100526B: Swift/UVOT Upper Limits
  2. GRB 100526A: Swift/UVOT Upper Limits
  3. GRB 100526A: Gemini/NIRI infrared afterglow candidate
  4. GRB 100526A: NOT optical upper limit
  5. GRB 100526B: Swift XRT/UVOT observations
  6. GRB 100526A: Enhanced Swift-XRT position
  7. GRB 100526A: MASTER-Net optical alert observations
  8. GRB 100526A: Swift detection of a burst
  9. GRB 100418A: Subaru late-time optical imaging and spectroscopy
  10. GRB 100522A: Enhanced Swift-XRT position
  11. GRB 100522A: NIR observations from CAHA
  12. GRB 100522A: Swift detection of a burst
  13. GRB 100418A: CrAO optical observations
  14. GRB 100518A: GROND afterglow observation and photo-z
  15. GRB 100518A: Swift-XRT refined analysis
  16. GRB 100518A: BOOTES-3 optical observations
  17. GRB 100518A: Swift target of opportunity observation of the INTEGRAL burst
  18. GRB 100513A: MITSuME Akeno Optical Observation
  19. Swift Trigger 422437 is probably not a GRB
  20. GRB 100517A: MASTER-Net wide field camera prompt optical observations
  21. GRB 100514A: optical afterglow confirmation
  22. GRB 100514A: Swift/UVOT Observations
  23. GRB 100514A: YNAO-GMG observations
  24. GRB 100514A: Swift XRT refined analysis
  25. GRB 100514A: Enhanced Swift-XRT position
  26. GRB 100514A: Swift detection of a burst
  27. GRB 100513A: Swift/UVOT upper limits
  28. GRB 100513A, RIMOTS optical upper limits
  29. GRB 100513A: Swift XRT refined analysis
  30. GRB 100513A: Enhanced Swift-XRT position
  31. GRB 100513A: Lick observations and R-band dropout
  32. GRB 100513A: SARA-N Upper Limit
  33. GRB 100513A: Swift detection of a burst
  34. GRB 100511A: Super-LOTIS early observations
  35. GRB100504A: Optical upper limits at IAO
  36. GRB 100511A, RIMOTS optical upper limits
  37. Trigger 421695: Swift detection of a possible burst
  38. GRB 100508A: GROND Detection of the optical afterglow
  39. GRB 100508A: Swift-XRT Refined analysis
  40. GRB 100508A: Enhanced Swift-XRT position
  41. GRB100508A: Swift/UVOT Detection of the Afterglow
  42. GRB 100508A: ROTSE-III Optical Limits
  43. GRB 100508A: Swift detection of a burst
  44. GRB 100418A: Keck imaging
  45. An SGR-like burst from the magnetar 1E 1841-04.5 in Kes 73
  46. GRB 100504A: Swift/UVOT Observations
  47. GRB 100504A: Enhanced Swift-XRT position
  48. GRB 100504A: GROND Upper limits
  49. GRB 100504A: SARA-South Upper Limit
  50. GRB 100504A: Swift detection of a burst
  51. INTEGRAL observations of Swift GRB trigger 421072
  52. Trigger 421072: Possible Swift detection of a GRB or transient
  53. GRB 100420A: Terskol optical upper limit
  54. GRB 100427A: Swift XRT and UVOT Upper Limits
  55. GRB 100414A : EVLA Radio Detection
  56. GRB 100414A : WSRT Radio Detection
  57. GRB 100423A: CrAO optical observations
  58. GRB 100418A: Terskol optical observations
  59. GRB 100424A: CrAO optical observations
  60. GRB 100424A: NIR Afterglow Confirmation
  61. GRB 100424A: Gemini/NIRI H-band observations
  62. GRB100425A: Swift/UVOT Upper Limits
  63. GRB 100424A: Swift/UVOT Upper Limits
  64. GRB 100424A: Liverpool Telescope Upper Limits
  65. GRB 100425A: Enhanced Swift-XRT position
  66. GRB 100425A: GROND afterglow observation
  67. GRB 100424A: Gemini/NIRI Candidate Afterglow
  68. GRB 100424A: D50 optical limits
  69. GRB 100425A: candidate optical afterglow from the VLT
  70. GRB100424A: MITSuME optical upper limits
  71. GRB100423A: MITSuME optical upper limits
  72. GRB 100424A : Lulin early z'-band upper limit
  73. GRB 100424A: GROND Upper Limits
  74. GRB 100424A: PAIRITEL NIR Upper Limits
  75. GRB 100425A: Swift detection of a burst
  76. GRB 100424A: WHT z-band observations
  77. GRB 100424A: NOT optical observations
  78. GRB 100424A: Enhanced Swift-XRT position
  79. GRB 100424A: Swift detection of a burst
  80. GRB 100420A: GRT Optical Observation
  81. Swift Trigger 420256: D50 optical limits
  82. Swift Trigger 420256: IAC80 R-band observations
  83. Swift Trigger 420256: BOOTES-2 observations
  84. Trigger 420256: Swift detection of a possible GRB
  85. GRB 100423A: GROND discovery of afterglow
  86. GRB100418A: REM possible afterglow detection
  87. GRB 100418A: Continuing Swift/UVOT Observations
  88. GRB100420A: MITSuME optical upper limits
  89. GRB 100414A: CFHT optical observations
  90. GRB 100420A: Swift/UVOT Upper Limits
  91. GRB 100420A: Enhanced Swift-XRT position
  92. GRB 100418A: SARA second epoch
  93. GRB 100420A: SARA Upper Limits
  94. GRB 100418A: optical observations
  95. GRB 100418A: SMA submm detection
  96. GRB 100420A: Swift detection of a burst
  97. GRB 100418A: Swift/UVOT Observations
  98. GRB 100418A: Gemini-N redshift confirmation
  99. GRB100418A: VLT/X-shooter redshift and photometry
  100. GRB 100418A: SARA observations

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