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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"

45688 results found.

  1. GRB100628A : MOA optical upper limit
  2. GRB 090709A: Host galaxy detection
  3. GRB 100628A: Magellan near-IR observations
  4. GRB 100628A: Swift/UVOT Upper Limits
  5. GRB100628A: RTT150 optical observations
  6. GRB 100628A: Swift XRT detection of a possible X-ray afterglow
  7. GRB 100628A: INTEGRAL SPI-ACS light curve
  8. GRB 100625A: Magellan near-IR Observations
  9. GRB 100628A: Swift-BAT refined analysis
  10. GRB 100628A: Swift detection of a short hard burst
  11. Swift-BAT trigger 426048 is not a burst
  12. GRB 100614A: CrAO optical limit
  13. GRB 100625A: Swift/UVOT Upper Limits
  14. GRB 100625A: Swift-BAT refined analysis
  15. Konus-Wind observation of GRB 100625A
  16. GRB 100625A : IRSF/SIRIUS NIR upper limit
  17. GRB 100625A: Swift-XRT Team refined analysis
  18. GRB 100625A: Gemini candidate afterglow
  19. GRB 100625A: Enhanced Swift-XRT position
  20. GRB100625A : MOA optical upper limit
  21. GRB 100625A: Swift detection of a short hard burst
  22. GRB 100418A: late time optical observations
  23. Konus-Wind observation of GRB 100621A
  24. GRB 100621A: IRSF/SIRIUS NIR Observation
  25. GRB 100621A MOA-II optical limit
  26. GRB 100619A: Correction to the Fermi GBM trigger time
  27. GRB 100621A: Swift/UVOT observations
  28. GRB 100621A: Swift XRT refined analysis
  29. GRB 100621A: VLT/X-shooter redshift
  30. GRB 100621A: Swift-BAT refined analysis
  31. GRB 100621A: GROND observation of bright NIR afterglow
  32. GRB 100621A: Enhanced Swift-XRT position
  33. GRB 100621A: Prompt enhanced Swift-XRT position
  34. GRB 100621A: ROTSE-III Optical Limits
  35. GRB 100621A: Swift detection of a burst
  36. GRB 100606A: Optical Limits
  37. GRB 100619A: Fermi GBM detection
  38. GRB 100619A: Swift/UVOT Upper Limits
  39. GRB 100619A: Swift-XRT refind analysis
  40. GRB 100619A: Enhanced Swift-XRT position
  41. GRB 100619A: Swift-BAT refined analysis
  42. GRB 100619A: Swift detection of a burst
  43. GRB 100614A: Gemini/NIRI Observations
  44. GRB 100615A: Gemini/NIRI Observations
  45. XRF 100616a : MAXI/GSC detection of a probable XRF
  46. Fermi GBM trigger 100612038 is not a GRB
  47. GRB 100615A: Swift/UVOT Upper Limits
  48. GRB 100614A: Swift/UVOT Upper Limits
  49. GRB 100614A: NOT optical upper limits
  50. GRB 100614A: MASTER-Net optical alert observations
  51. GRB 100614A: Swift-BAT refined analysis
  52. GRB 100615A: Fermi GBM detection
  53. GRB 100615A: Swift-BAT refined analysis
  54. GRB 100614A: Enhanced Swift-XRT position
  55. GRB 100615A: Enhanced Swift-XRT position
  56. GRB 100615A: Swift-XRT refined analysis
  57. GRB 100614A: Swift-XRT refined analysis
  58. GRB 100614 : XMM-Newton observation
  59. GRB 100615A: GROND observations, upper limits
  60. GRB 100615A: PAIRITEL NIR Upper Limits
  61. GRB 100615A: NTT/Ultracam imaging
  62. GRB 100615A: Swift detection of a burst
  63. GRB 100614A: WHT I-band observations
  64. GRB 100614A: BOOTES-2/TELMA optical observations
  65. GRB 100614A: Liverpool Telescope Observations
  66. GRB 100614A: Swift detection of a burst
  67. GRB 100606A: Suzaku WAM observation of the prompt emission
  68. GRB 100606A: GROND observations
  69. Trigger 424161: Swift/BAT trigger on XTE J1946+274/GRO J1944+26
  70. Konus-Wind observation of GRB 100606A
  71. Radio detection of GRB100418a with ATCA
  72. GRB 100606A: Gemini-South imaging
  73. GRB 100606A: Swift/UVOT Upper Limits
  74. GRB 100606A Swift-XRT refined analysis
  75. GRB 100606A: Swift-BAT refined analysis
  76. GRB 100606A: Enhanced Swift-XRT position
  77. Swift Trigger 424040 is not a GRB
  78. GRB 100606A: Prompt enhanced Swift-XRT position
  79. GRB 100606A: Swift detection of a burst
  80. Swift detection of outburst from the SFXT IGR J18410-0535
  81. GRB 100111A: Maidanak optical observations
  82. GRB 100418A: Maidanak optical observations
  83. GRB 100513A: CrAO optical observations
  84. GRB 100514A: CrAO optical observations
  85. GRB 100526A: optical upper limit
  86. Konus-Wind observation of GRB 100528A
  87. GRB 100528A: Faulkes Telescope North Detection
  88. GRB 100528A: GROND detection in all bands
  89. GRB 100528A: NOT optical observation
  90. Swift UVOT and UVOT-enhanced XRT position for GRB 100528A
  91. GRB100526B: GROND Upper limits
  92. GRB 100528A: Fermi GBM observation
  93. GRB 100528A: SuperAGILE Localization of a Long GRB
  94. GRB 100526B: Swift-XRT confirmation of fading afterglow
  95. GRB 100526B: Swift/UVOT Upper Limits
  96. GRB 100526A: Swift/UVOT Upper Limits
  97. GRB 100526A: Gemini/NIRI infrared afterglow candidate
  98. GRB 100526A: NOT optical upper limit
  99. GRB 100526A: Swift XRT refined analysis
  100. GRB 100526B: Swift-BAT refined analysis

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