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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"

11836 results found.

  1. Konus-Wind observation of GRB 100704A
  2. GRB 100703A: a short GRB detected by INTEGRAL
  3. GRB 100704A: Fermi GBM observation
  4. GRB 100702: ROTSE-III Optical Limits
  5. GRB 100615A: Chandra X-ray ToO Observation
  6. XRF 100701A : MAXI/GSC detection of a probable XRF
  7. GRB 100614A: CrAO optical limit
  8. Konus-Wind observation of GRB 100625A
  9. GRB 100625A : IRSF/SIRIUS NIR upper limit
  10. GRB 100625A: Swift-XRT Team refined analysis
  11. GRB 100625A: Swift detection of a short hard burst
  12. GRB 100418A: late time optical observations
  13. Konus-Wind observation of GRB 100621A
  14. GRB 100621A: Swift XRT refined analysis
  15. GRB 100621A: GROND observation of bright NIR afterglow
  16. GRB 100621A: ROTSE-III Optical Limits
  17. GRB 100606A: Optical Limits
  18. GRB 100619A: Swift-BAT refined analysis
  19. GRB 100619A: Swift detection of a burst
  20. XRF 100616a : MAXI/GSC detection of a probable XRF
  21. GRB 100615A: Swift-XRT refined analysis
  22. GRB 100614A: Swift-XRT refined analysis
  23. GRB 100615A: GROND observations, upper limits
  24. GRB 100615A: Swift detection of a burst
  25. GRB 100614A: Swift detection of a burst
  26. Trigger 424161: Swift/BAT trigger on XTE J1946+274/GRO J1944+26
  27. Konus-Wind observation of GRB 100606A
  28. GRB 100606A Swift-XRT refined analysis
  29. GRB 100606A: Swift-BAT refined analysis
  30. GRB 100513A: CrAO optical observations
  31. Konus-Wind observation of GRB 100528A
  32. Swift UVOT and UVOT-enhanced XRT position for GRB 100528A
  33. GRB 100528A: SuperAGILE Localization of a Long GRB
  34. GRB 100526A: Swift XRT refined analysis
  35. GRB 100526B: Swift XRT/UVOT observations
  36. GRB 100526A: Swift-BAT refined analysis
  37. GRB 100526A: Swift detection of a burst
  38. Konus-Wind observation of GRB 100522A
  39. GRB 100522A: Swift XRT refined analysis
  40. GRB 100522A: NIR observations from CAHA
  41. GRB 100522A: Swift detection of a burst
  42. GRB 100518A: Swift-XRT refined analysis
  43. Update to the configuration of the Fermi-LAT onboard GRB search
  44. GRB 100518A: Faulkes Telescope North Afterglow Candidate
  45. GRB 100518A: Swift target of opportunity observation of the INTEGRAL burst
  46. GRB 100518A: a long GRB detected with INTEGRAL
  47. Swift Trigger 422437 is probably not a GRB
  48. GRB 100513A: EVLA radio observation
  49. GRB 100514A: Swift XRT refined analysis
  50. GRB 100514A: MASTER-Net optical observations
  51. GRB 100514A: Swift detection of a burst
  52. GRB 100513A: Swift XRT refined analysis
  53. GRB 100513A: Swift detection of a burst
  54. GRB 100511A, RIMOTS optical upper limits
  55. GRB 100508A: Swift-XRT Refined analysis
  56. GRB 100508A: Swift-BAT refined analysis
  57. GRB 100508A: ROTSE-III Optical Limits
  58. GRB 100508A: Swift detection of a burst
  59. GRB 100504A: Fermi GBM observation
  60. GRB 100504A: GROND Upper limits
  61. GRB 100504A: SARA-South Upper Limit
  62. GRB 100504A: Swift detection of a burst
  63. INTEGRAL observations of Swift GRB trigger 421072
  64. GRB 100420A: Gemini discovery of infrared afterglow
  65. GRB 100420A: Terskol optical upper limit
  66. GRB 100418A: RTT150 optical observations
  67. Konus-Wind observation of GRB 100423A
  68. GRB 100418A: Terskol optical observations
  69. GRB 100425A: Swift XRT refined analysis
  70. GRB 100424A: Liverpool Telescope Upper Limits
  71. GRB 100425A: GROND afterglow observation
  72. GRB 100424A: D50 optical limits
  73. GRB 100424A: GROND Upper Limits
  74. GRB 100424A: Swift-XRT refined analysis
  75. GRB 100425A: Swift detection of a burst
  76. GRB 100424A, Swift-BAT refined analysis
  77. GRB 100420A: GRT Optical Observation
  78. GRB 100418A: ROVOR optical measurements at 35 hours
  79. Swift Trigger 420256: ROTSE-III Optical Limits
  80. Radio afterglow detection of GRB 100418A with the EVLA
  81. GRB 100418A: Continued PAIRITEL NIR Observations
  82. GRB 100418A: WSRT Radio Detection
  83. GRB 100418A: RTT150 optical observations
  84. GRB100420A: MITSuME optical upper limits
  85. GRB 100414A: CFHT optical observations
  86. GRB 100420A: SARA Upper Limits
  87. GRB 100418A: RTT150 observations during the optical afterglow maximum
  88. GRB 100418A: SMA submm detection
  89. GRB 100420A: ROTSE-III Optical Limits
  90. GRB 100418A: Swift-XRT Refined Analysis
  91. GRB100414A: SAO RAS optical observations
  92. GRB 100418A: ROTSE-III Optical Limits
  93. GRB 100418A: Swift detection of a burst with a possible optical afterglow
  94. GRB 100414A: Suzaku WAM observation of the prompt emission
  95. Konus-Wind observation of GRB 100414B
  96. GRB 100415A: MAXI/GSC detection of a probable GRB
  97. GRB 100414A: Fermi GBM detection
  98. GRB100414A: Fermi LAT detection
  99. Konus-Wind observation of GRB 100413A
  100. Tentative redshift of GRB100413A from X-ray data

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