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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"

38673 results found.

  1. GRB 100513A: CrAO optical observations
  2. GRB 100514A: CrAO optical observations
  3. GRB 100526A: optical upper limit
  4. Konus-Wind observation of GRB 100528A
  5. GRB 100528A: Faulkes Telescope North Detection
  6. GRB 100528A: GROND detection in all bands
  7. GRB 100528A: NOT optical observation
  8. Swift UVOT and UVOT-enhanced XRT position for GRB 100528A
  9. GRB100526B: GROND Upper limits
  10. GRB 100528A: Fermi GBM observation
  11. GRB 100528A: SuperAGILE Localization of a Long GRB
  12. GRB 100526B: Swift-XRT confirmation of fading afterglow
  13. GRB 100526B: Swift/UVOT Upper Limits
  14. GRB 100526A: Swift/UVOT Upper Limits
  15. GRB 100526A: Gemini/NIRI infrared afterglow candidate
  16. GRB 100526A: NOT optical upper limit
  17. GRB 100526A: Swift XRT refined analysis
  18. GRB 100526B: Swift XRT/UVOT observations
  19. GRB 100526A: Enhanced Swift-XRT position
  20. GRB 100526B: Swift detection of a probable GRB
  21. GRB 100526A: MASTER-Net optical alert observations
  22. GRB 100526A: Swift detection of a burst
  23. Konus-Wind observation of GRB 100522A
  24. GRB100522A: Suzaku WAM observation of the prompt emission
  25. GRB 100418A: Subaru late-time optical imaging and spectroscopy
  26. GRB 100522A: GROND observations, upper limits
  27. Swift/UVOT observations of GRB100522A.
  28. GRB 100522A: Fermi GBM observation
  29. GRB 100522A: Swift XRT refined analysis
  30. GRB 100522A: Enhanced Swift-XRT position
  31. GRB 100522A: NIR observations from CAHA
  32. GRB 100522A: BOOTES-2 optical limit
  33. GRB 100522A: Swift detection of a burst
  34. GRB 100418A: CrAO optical observations
  35. GRB 100518A: GROND afterglow observation and photo-z
  36. GRB 100518A: Swift/UVOT Upper Limits
  37. GRB 100518A: Swift-XRT refined analysis
  38. GRB 100518A: optical afterglow decay
  39. GRB 100518A: BOOTES-3 optical observations
  40. Update to the configuration of the Fermi-LAT onboard GRB search
  41. GRB 100518A: Faulkes Telescope North Afterglow Candidate
  42. GRB 100518A: Swift target of opportunity observation of the INTEGRAL burst
  43. GRB 100513A: MITSuME Akeno Optical Observation
  44. GRB 100518A: a long GRB detected with INTEGRAL
  45. Swift Trigger 422437 is probably not a GRB
  46. Fermi/GBM trigger 295791986 - unreliable location
  47. GRB 100517A: MASTER-Net wide field camera prompt optical observations
  48. GRB 100513A: EVLA radio observation
  49. GRB 100514A: optical afterglow confirmation
  50. GRB 100514A: Swift/UVOT Observations
  51. GRB 100514A: YNAO-GMG observations
  52. GRB 100514A: Swift XRT refined analysis
  53. GRB 100514A: MASTER-Net optical observations
  54. GRB 100514A: Enhanced Swift-XRT position
  55. GRB 100514A: Faulkes Telescope South observations
  56. GRB 100514A: Swift detection of a burst
  57. GRB 100513A: Faulkes Telescope South observations
  58. GRB 100513A: Swift/UVOT upper limits
  59. GRB 100513A, RIMOTS optical upper limits
  60. GRB 100513A: Swift XRT refined analysis
  61. GRB 100513A: Gemini/GMOS Spectroscopic Redshift
  62. GRB 100513A: Enhanced Swift-XRT position
  63. GRB 100513A: Swift detection of a burst
  64. GRB 100510A: Fermi GBM detection/observation
  65. GRB 100511A: Fermi GBM detection/observation
  66. Swift-BAT trigger 421695 is likely not astrophysical
  67. GRB100504A: Optical upper limits at IAO
  68. GRB 100510A: MAXI/GSC detection
  69. GRB 100511A, RIMOTS optical upper limits
  70. Trigger 421695: Swift detection of a possible burst
  71. GRB100508A: Further Swift/UVOT Observations
  72. GRB100503A: Suzaku WAM observation of the prompt emission
  73. GRB 100508A: GROND Detection of the optical afterglow
  74. GRB 100508A: Swift-XRT Refined analysis
  75. GRB 100508A: Swift-BAT refined analysis
  76. GRB 100508A: Enhanced Swift-XRT position
  77. GRB100508A: Swift/UVOT Detection of the Afterglow
  78. GRB 100508A: ROTSE-III Optical Limits
  79. GRB 100508A: Swift detection of a burst
  80. GRB 100418A: Keck imaging
  81. Fermi Gamma-ray Burst Monitor trigger 294712621 is not a GRB
  82. GRB 100504A: Fermi GBM observation
  83. An SGR-like burst from the magnetar 1E 1841-04.5 in Kes 73
  84. GRB 100504A: Swift/UVOT Observations
  85. GRB 100418A: Flattening of the Swift/UVOT Optical Light Curve
  86. GRB 100504A: Swift-XRT refined analysis
  87. GRB 100504A: Enhanced Swift-XRT position
  88. GRB 100504A: GROND Upper limits
  89. GRB 100504A: SARA-South Upper Limit
  90. GRB 100503A: Fermi GBM detection
  91. GRB 100504A: UVOT-enhanced XRT position
  92. GRB 100504A: Swift detection of a burst
  93. Swift-BAT trigger 421072 is not astrophyical
  94. INTEGRAL observations of Swift GRB trigger 421072
  95. GRB100423A : Suzaku WAM observation of the prompt emission
  96. Trigger 421072: Possible Swift detection of a GRB or transient
  97. GRB 100420A: EVLA radio observations
  98. GRB 100420A: Gemini discovery of infrared afterglow
  99. GRB 100423A: xinglong TNT optical upper limit
  100. GRB 100420A: Terskol optical upper limit

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