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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 100628A: Swift/UVOT Upper Limits
  2. GRB100628A: RTT150 optical observations
  3. GRB 100628A: Swift detection of a short hard burst
  4. GRB 100614A: CrAO optical limit
  5. GRB 100625A: Swift/UVOT Upper Limits
  6. GRB 100625A: Swift-XRT Team refined analysis
  7. GRB 100625A: Gemini candidate afterglow
  8. GRB 100625A: Enhanced Swift-XRT position
  9. GRB 100625A: Swift detection of a short hard burst
  10. GRB 100418A: late time optical observations
  11. GRB 100621A: IRSF/SIRIUS NIR Observation
  12. GRB 100621A: Swift/UVOT observations
  13. GRB 100621A: GROND observation of bright NIR afterglow
  14. GRB 100621A: Enhanced Swift-XRT position
  15. GRB 100621A: ROTSE-III Optical Limits
  16. GRB 100621A: Swift detection of a burst
  17. GRB 100606A: Optical Limits
  18. GRB 100619A: Swift/UVOT Upper Limits
  19. GRB 100619A: Enhanced Swift-XRT position
  20. GRB 100619A: Swift detection of a burst
  21. GRB 100614A: Gemini/NIRI Observations
  22. GRB 100615A: Gemini/NIRI Observations
  23. XRF 100616a : MAXI/GSC detection of a probable XRF
  24. GRB 100615A: Swift/UVOT Upper Limits
  25. GRB 100614A: Swift/UVOT Upper Limits
  26. GRB 100614A: NOT optical upper limits
  27. GRB 100614A: Enhanced Swift-XRT position
  28. GRB 100615A: Enhanced Swift-XRT position
  29. GRB 100615A: PAIRITEL NIR Upper Limits
  30. GRB 100615A: NTT/Ultracam imaging
  31. GRB 100615A: Swift detection of a burst
  32. GRB 100614A: Swift detection of a burst
  33. GRB 100606A: GROND observations
  34. Trigger 424161: Swift/BAT trigger on XTE J1946+274/GRO J1944+26
  35. Radio detection of GRB100418a with ATCA
  36. GRB 100606A: Swift/UVOT Upper Limits
  37. GRB 100606A Swift-XRT refined analysis
  38. GRB 100606A: Enhanced Swift-XRT position
  39. Swift Trigger 424040 is not a GRB
  40. GRB 100606A: Swift detection of a burst
  41. Swift detection of outburst from the SFXT IGR J18410-0535
  42. GRB 100111A: Maidanak optical observations
  43. GRB 100418A: Maidanak optical observations
  44. GRB 100513A: CrAO optical observations
  45. GRB 100514A: CrAO optical observations
  46. GRB 100526A: optical upper limit
  47. GRB 100528A: Faulkes Telescope North Detection
  48. GRB 100528A: GROND detection in all bands
  49. GRB 100528A: NOT optical observation
  50. Swift UVOT and UVOT-enhanced XRT position for GRB 100528A
  51. GRB100526B: GROND Upper limits
  52. GRB 100526B: Swift/UVOT Upper Limits
  53. GRB 100526A: Swift/UVOT Upper Limits
  54. GRB 100526A: Gemini/NIRI infrared afterglow candidate
  55. GRB 100526A: NOT optical upper limit
  56. GRB 100526B: Swift XRT/UVOT observations
  57. GRB 100526A: Enhanced Swift-XRT position
  58. GRB 100526A: MASTER-Net optical alert observations
  59. GRB 100526A: Swift detection of a burst
  60. GRB 100418A: Subaru late-time optical imaging and spectroscopy
  61. GRB 100522A: Enhanced Swift-XRT position
  62. GRB 100522A: NIR observations from CAHA
  63. GRB 100522A: Swift detection of a burst
  64. GRB 100418A: CrAO optical observations
  65. GRB 100518A: GROND afterglow observation and photo-z
  66. GRB 100518A: Swift-XRT refined analysis
  67. GRB 100518A: BOOTES-3 optical observations
  68. GRB 100518A: Swift target of opportunity observation of the INTEGRAL burst
  69. GRB 100513A: MITSuME Akeno Optical Observation
  70. Swift Trigger 422437 is probably not a GRB
  71. GRB 100517A: MASTER-Net wide field camera prompt optical observations
  72. GRB 100514A: optical afterglow confirmation
  73. GRB 100514A: Swift/UVOT Observations
  74. GRB 100514A: YNAO-GMG observations
  75. GRB 100514A: Enhanced Swift-XRT position
  76. GRB 100514A: Swift detection of a burst
  77. GRB 100513A: Swift/UVOT upper limits
  78. GRB 100513A, RIMOTS optical upper limits
  79. GRB 100513A: Enhanced Swift-XRT position
  80. GRB 100513A: SARA-N Upper Limit
  81. GRB 100513A: Swift detection of a burst
  82. GRB 100511A: Fermi GBM detection/observation
  83. GRB 100511A: Super-LOTIS early observations
  84. GRB100504A: Optical upper limits at IAO
  85. GRB 100510A: MAXI/GSC detection
  86. GRB 100511A, RIMOTS optical upper limits
  87. Trigger 421695: Swift detection of a possible burst
  88. GRB 100508A: GROND Detection of the optical afterglow
  89. GRB 100508A: Enhanced Swift-XRT position
  90. GRB100508A: Swift/UVOT Detection of the Afterglow
  91. GRB 100508A: ROTSE-III Optical Limits
  92. GRB 100508A: Swift detection of a burst
  93. GRB 100418A: Keck imaging
  94. GRB 100418A: RTT150 optical observations
  95. An SGR-like burst from the magnetar 1E 1841-04.5 in Kes 73
  96. GRB 100504A: Swift/UVOT Observations
  97. GRB 100504A: Enhanced Swift-XRT position
  98. GRB 100504A: GROND Upper limits
  99. GRB 100504A: SARA-South Upper Limit
  100. GRB 100503A: Fermi GBM detection

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