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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"

21817 results found.

  1. Trigger 424161: Swift/BAT trigger on XTE J1946+274/GRO J1944+26
  2. Konus-Wind observation of GRB 100606A
  3. Radio detection of GRB100418a with ATCA
  4. GRB 100606A: Swift/UVOT Upper Limits
  5. GRB 100606A: Enhanced Swift-XRT position
  6. Swift Trigger 424040 is not a GRB
  7. GRB 100606A: Swift detection of a burst
  8. Swift detection of outburst from the SFXT IGR J18410-0535
  9. GRB 100111A: Maidanak optical observations
  10. GRB 100418A: Maidanak optical observations
  11. GRB 100513A: CrAO optical observations
  12. GRB 100514A: CrAO optical observations
  13. GRB 100526A: optical upper limit
  14. Konus-Wind observation of GRB 100528A
  15. GRB 100528A: Faulkes Telescope North Detection
  16. GRB 100528A: GROND detection in all bands
  17. GRB 100528A: NOT optical observation
  18. Swift UVOT and UVOT-enhanced XRT position for GRB 100528A
  19. GRB100526B: GROND Upper limits
  20. GRB 100528A: SuperAGILE Localization of a Long GRB
  21. GRB 100526B: Swift/UVOT Upper Limits
  22. GRB 100526A: Swift/UVOT Upper Limits
  23. GRB 100526A: Gemini/NIRI infrared afterglow candidate
  24. GRB 100526A: NOT optical upper limit
  25. GRB 100526B: Swift XRT/UVOT observations
  26. GRB 100526A: Enhanced Swift-XRT position
  27. GRB 100526A: MASTER-Net optical alert observations
  28. GRB 100526A: Swift detection of a burst
  29. GRB100522A: Suzaku WAM observation of the prompt emission
  30. GRB 100418A: Subaru late-time optical imaging and spectroscopy
  31. GRB 100522A: Fermi GBM observation
  32. GRB 100522A: Enhanced Swift-XRT position
  33. GRB 100522A: NIR observations from CAHA
  34. GRB 100522A: Swift detection of a burst
  35. GRB 100418A: CrAO optical observations
  36. GRB 100518A: GROND afterglow observation and photo-z
  37. GRB 100518A: Swift-XRT refined analysis
  38. GRB 100518A: BOOTES-3 optical observations
  39. Update to the configuration of the Fermi-LAT onboard GRB search
  40. GRB 100518A: Swift target of opportunity observation of the INTEGRAL burst
  41. GRB 100513A: MITSuME Akeno Optical Observation
  42. GRB 100518A: a long GRB detected with INTEGRAL
  43. Swift Trigger 422437 is probably not a GRB
  44. GRB 100517A: MASTER-Net wide field camera prompt optical observations
  45. GRB 100514A: optical afterglow confirmation
  46. GRB 100514A: Swift/UVOT Observations
  47. GRB 100514A: YNAO-GMG observations
  48. GRB 100514A: Enhanced Swift-XRT position
  49. GRB 100514A: Swift detection of a burst
  50. GRB 100513A: Swift/UVOT upper limits
  51. GRB 100513A, RIMOTS optical upper limits
  52. GRB 100513A: Enhanced Swift-XRT position
  53. GRB 100513A: SARA-N Upper Limit
  54. GRB 100513A: Swift detection of a burst
  55. GRB 100510A: Fermi GBM detection/observation
  56. GRB 100511A: Fermi GBM detection/observation
  57. GRB 100511A: Super-LOTIS early observations
  58. Swift-BAT trigger 421695 is likely not astrophysical
  59. GRB100504A: Optical upper limits at IAO
  60. GRB 100511A, RIMOTS optical upper limits
  61. Trigger 421695: Swift detection of a possible burst
  62. GRB100503A: Suzaku WAM observation of the prompt emission
  63. GRB 100508A: GROND Detection of the optical afterglow
  64. GRB 100508A: Enhanced Swift-XRT position
  65. GRB100508A: Swift/UVOT Detection of the Afterglow
  66. GRB 100508A: ROTSE-III Optical Limits
  67. GRB 100508A: Swift detection of a burst
  68. GRB 100418A: Keck imaging
  69. GRB 100418A: RTT150 optical observations
  70. An SGR-like burst from the magnetar 1E 1841-04.5 in Kes 73
  71. GRB 100504A: Swift/UVOT Observations
  72. GRB 100504A: Enhanced Swift-XRT position
  73. GRB 100504A: GROND Upper limits
  74. GRB 100504A: SARA-South Upper Limit
  75. GRB 100503A: Fermi GBM detection
  76. GRB 100504A: Swift detection of a burst
  77. INTEGRAL observations of Swift GRB trigger 421072
  78. GRB100423A : Suzaku WAM observation of the prompt emission
  79. Trigger 421072: Possible Swift detection of a GRB or transient
  80. GRB 100420A: Terskol optical upper limit
  81. GRB 100427A: Swift XRT and UVOT Upper Limits
  82. GRB 100414A : EVLA Radio Detection
  83. GRB 100414A : WSRT Radio Detection
  84. Konus-Wind observation of GRB 100423A
  85. GRB 100423A: CrAO optical observations
  86. GRB 100418A: Terskol optical observations
  87. GRB 100424A: CrAO optical observations
  88. GRB 100424A: NIR Afterglow Confirmation
  89. GRB 100424A: Gemini/NIRI H-band observations
  90. GRB100425A: Swift/UVOT Upper Limits
  91. GRB 100424A: Swift/UVOT Upper Limits
  92. GRB 100424A: Liverpool Telescope Upper Limits
  93. GRB 100425A: Enhanced Swift-XRT position
  94. GRB 100425A: GROND afterglow observation
  95. GRB 100424A: Gemini/NIRI Candidate Afterglow
  96. GRB 100424A: D50 optical limits
  97. GRB 100425A: candidate optical afterglow from the VLT
  98. GRB100424A: MITSuME optical upper limits
  99. GRB100423A: MITSuME optical upper limits
  100. GRB 100424A : Lulin early z'-band upper limit

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