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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"

37945 results found.

  1. GRB 100526B: Swift-BAT refined analysis
  2. GRB 100526B: Swift XRT/UVOT observations
  3. GRB 100526A: Swift-BAT refined analysis
  4. GRB 100526A: Enhanced Swift-XRT position
  5. GRB 100526B: Swift detection of a probable GRB
  6. GRB 100526A: MASTER-Net optical alert observations
  7. GRB 100526A: Swift detection of a burst
  8. Konus-Wind observation of GRB 100522A
  9. GRB100522A: Suzaku WAM observation of the prompt emission
  10. GRB 100418A: Subaru late-time optical imaging and spectroscopy
  11. GRB 100522A: GROND observations, upper limits
  12. Swift/UVOT observations of GRB100522A.
  13. GRB 100522A: Fermi GBM observation
  14. GRB 100522A: Swift XRT refined analysis
  15. GRB 100522A, Swift-BAT refined analysis
  16. GRB 100522A: Enhanced Swift-XRT position
  17. GRB 100522A: NIR observations from CAHA
  18. GRB 100522A: BOOTES-2 optical limit
  19. GRB 100522A: Swift detection of a burst
  20. GRB 100418A: CrAO optical observations
  21. GRB 100518A: GROND afterglow observation and photo-z
  22. GRB 100518A: Swift/UVOT Upper Limits
  23. GRB 100518A: Swift-XRT refined analysis
  24. GRB 100518A: optical afterglow decay
  25. GRB 100518A: BOOTES-3 optical observations
  26. Update to the configuration of the Fermi-LAT onboard GRB search
  27. GRB 100518A: Faulkes Telescope North Afterglow Candidate
  28. GRB 100518A: Swift target of opportunity observation of the INTEGRAL burst
  29. GRB 100513A: MITSuME Akeno Optical Observation
  30. Swift-BAT trigger 422437 is not anything astrophysical
  31. GRB 100518A: a long GRB detected with INTEGRAL
  32. Swift Trigger 422437 is probably not a GRB
  33. Fermi/GBM trigger 295791986 - unreliable location
  34. GRB 100517A: MASTER-Net wide field camera prompt optical observations
  35. GRB 100513A: EVLA radio observation
  36. GRB 100514A: optical afterglow confirmation
  37. GRB 100514A: Swift/UVOT Observations
  38. GRB 100514A: YNAO-GMG observations
  39. GRB 100514A: Swift XRT refined analysis
  40. GRB 100514A: MASTER-Net optical observations
  41. GRB 100514A: Enhanced Swift-XRT position
  42. GRB 100514A: Swift-BAT refined analysis
  43. GRB 100514A: Faulkes Telescope South observations
  44. GRB 100514A: Swift detection of a burst
  45. GRB 100513A: Faulkes Telescope South observations
  46. GRB 100513A: Swift/UVOT upper limits
  47. GRB 100513A, RIMOTS optical upper limits
  48. GRB 100513A: Swift XRT refined analysis
  49. GRB 100513A: Swift-BAT refined analysis
  50. GRB 100513A: Gemini/GMOS Spectroscopic Redshift
  51. GRB 100513A: Enhanced Swift-XRT position
  52. GRB 100513A: Lick observations and R-band dropout
  53. GRB 100513A: PAIRITEL continued observations and confirmation of fading
  54. GRB 100513A: SARA-N Upper Limit
  55. GRB 100513A: PAIRITEL NIR afterglow candidate
  56. GRB 100513A: Swift detection of a burst
  57. GRB 100510A: Fermi GBM detection/observation
  58. GRB 100511A: Fermi GBM detection/observation
  59. GRB 100511A: Super-LOTIS early observations
  60. Swift-BAT trigger 421695 is likely not astrophysical
  61. GRB100504A: Optical upper limits at IAO
  62. GRB 100510A: MAXI/GSC detection
  63. GRB 100511A, RIMOTS optical upper limits
  64. Trigger 421695: Swift detection of a possible burst
  65. GRB100508A: Further Swift/UVOT Observations
  66. GRB100503A: Suzaku WAM observation of the prompt emission
  67. GRB 100508A: GROND Detection of the optical afterglow
  68. GRB 100508A: Swift-XRT Refined analysis
  69. GRB 100508A: Swift-BAT refined analysis
  70. GRB 100508A: Enhanced Swift-XRT position
  71. GRB100508A: Swift/UVOT Detection of the Afterglow
  72. GRB 100508A: ROTSE-III Optical Limits
  73. GRB 100508A: Swift detection of a burst
  74. GRB 100418A: Keck imaging
  75. GRB 100418A: RTT150 optical observations
  76. Fermi Gamma-ray Burst Monitor trigger 294712621 is not a GRB
  77. Swift-BAT refined analysis of trigger 421262
  78. GRB 100504A: Fermi GBM observation
  79. An SGR-like burst from the magnetar 1E 1841-04.5 in Kes 73
  80. GRB 100504A: Swift/UVOT Observations
  81. GRB 100418A: Flattening of the Swift/UVOT Optical Light Curve
  82. GRB 100504A: Swift-XRT refined analysis
  83. GRB 100504A: Enhanced Swift-XRT position
  84. GRB 100504A: GROND Upper limits
  85. GRB 100504A: Swift-BAT refined analysis
  86. GRB 100504A: SARA-South Upper Limit
  87. GRB 100503A: Fermi GBM detection
  88. GRB 100504A: UVOT-enhanced XRT position
  89. GRB 100504A: Swift detection of a burst
  90. Swift-BAT trigger 421072 is not astrophyical
  91. INTEGRAL observations of Swift GRB trigger 421072
  92. GRB100423A : Suzaku WAM observation of the prompt emission
  93. Trigger 421072: Possible Swift detection of a GRB or transient
  94. GRB 100420A: EVLA radio observations
  95. GRB 100420A: Gemini discovery of infrared afterglow
  96. GRB 100423A: xinglong TNT optical upper limit
  97. GRB 100420A: Terskol optical upper limit
  98. GRB 100427A: Swift XRT and UVOT Upper Limits
  99. GRB 100427A: Fermi GBM detection
  100. GRB 100424a. Radio observations

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