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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"

32569 results found.

  1. GRB 100615A: GROND observations, upper limits
  2. GRB 100615A: PAIRITEL NIR Upper Limits
  3. GRB 100615A: NTT/Ultracam imaging
  4. GRB 100614A: WHT I-band observations
  5. GRB 100614A: BOOTES-2/TELMA optical observations
  6. GRB 100606A: GROND observations
  7. Konus-Wind observation of GRB 100606A
  8. Radio detection of GRB100418a with ATCA
  9. GRB 100606A: Gemini-South imaging
  10. GRB 100606A: Swift/UVOT Upper Limits
  11. GRB 100606A Swift-XRT refined analysis
  12. GRB 100606A: Swift-BAT refined analysis
  13. GRB 100111A: Maidanak optical observations
  14. GRB 100418A: Maidanak optical observations
  15. GRB 100513A: CrAO optical observations
  16. GRB 100514A: CrAO optical observations
  17. GRB 100526A: optical upper limit
  18. Konus-Wind observation of GRB 100528A
  19. GRB 100528A: Faulkes Telescope North Detection
  20. GRB 100528A: GROND detection in all bands
  21. GRB 100528A: NOT optical observation
  22. Swift UVOT and UVOT-enhanced XRT position for GRB 100528A
  23. GRB100526B: GROND Upper limits
  24. GRB 100528A: Fermi GBM observation
  25. GRB 100526B: Swift-XRT confirmation of fading afterglow
  26. GRB 100526B: Swift/UVOT Upper Limits
  27. GRB 100526A: Swift/UVOT Upper Limits
  28. GRB 100526A: Gemini/NIRI infrared afterglow candidate
  29. GRB 100526A: NOT optical upper limit
  30. GRB 100526A: Swift XRT refined analysis
  31. GRB 100526B: Swift-BAT refined analysis
  32. GRB 100526A: Swift-BAT refined analysis
  33. GRB 100526A: MASTER-Net optical alert observations
  34. Konus-Wind observation of GRB 100522A
  35. GRB100522A: Suzaku WAM observation of the prompt emission
  36. GRB 100418A: Subaru late-time optical imaging and spectroscopy
  37. GRB 100522A: GROND observations, upper limits
  38. Swift/UVOT observations of GRB100522A.
  39. GRB 100522A: Fermi GBM observation
  40. GRB 100522A: Swift XRT refined analysis
  41. GRB 100522A, Swift-BAT refined analysis
  42. GRB 100418A: CrAO optical observations
  43. GRB 100518A: GROND afterglow observation and photo-z
  44. GRB 100518A: Swift/UVOT Upper Limits
  45. GRB 100518A: Swift-XRT refined analysis
  46. GRB 100518A: optical afterglow decay
  47. GRB 100518A: BOOTES-3 optical observations
  48. Update to the configuration of the Fermi-LAT onboard GRB search
  49. GRB 100518A: Faulkes Telescope North Afterglow Candidate
  50. GRB 100513A: MITSuME Akeno Optical Observation
  51. GRB 100513A: EVLA radio observation
  52. GRB 100514A: optical afterglow confirmation
  53. GRB 100514A: Swift/UVOT Observations
  54. GRB 100514A: YNAO-GMG observations
  55. GRB 100514A: Swift XRT refined analysis
  56. GRB 100514A: MASTER-Net optical observations
  57. GRB 100514A: Swift-BAT refined analysis
  58. GRB 100514A: Faulkes Telescope South observations
  59. GRB 100513A: Faulkes Telescope South observations
  60. GRB 100513A: Swift/UVOT upper limits
  61. GRB 100513A, RIMOTS optical upper limits
  62. GRB 100513A: Swift XRT refined analysis
  63. GRB 100513A: Swift-BAT refined analysis
  64. GRB 100513A: Gemini/GMOS Spectroscopic Redshift
  65. GRB 100513A: Lick observations and R-band dropout
  66. GRB 100513A: PAIRITEL continued observations and confirmation of fading
  67. GRB 100513A: SARA-N Upper Limit
  68. GRB 100513A: PAIRITEL NIR afterglow candidate
  69. GRB 100510A: Fermi GBM detection/observation
  70. GRB 100511A: Super-LOTIS early observations
  71. Swift-BAT trigger 421695 is likely not astrophysical
  72. GRB100508A: Further Swift/UVOT Observations
  73. GRB100503A: Suzaku WAM observation of the prompt emission
  74. GRB 100508A: GROND Detection of the optical afterglow
  75. GRB 100508A: Swift-XRT Refined analysis
  76. GRB 100508A: Swift-BAT refined analysis
  77. GRB100508A: Swift/UVOT Detection of the Afterglow
  78. GRB 100508A: ROTSE-III Optical Limits
  79. GRB 100418A: Keck imaging
  80. GRB 100418A: RTT150 optical observations
  81. Swift-BAT refined analysis of trigger 421262
  82. GRB 100504A: Fermi GBM observation
  83. GRB 100504A: Swift/UVOT Observations
  84. GRB 100418A: Flattening of the Swift/UVOT Optical Light Curve
  85. GRB 100504A: Swift-XRT refined analysis
  86. GRB 100504A: GROND Upper limits
  87. GRB 100504A: Swift-BAT refined analysis
  88. GRB 100504A: SARA-South Upper Limit
  89. Swift-BAT trigger 421072 is not astrophyical
  90. INTEGRAL observations of Swift GRB trigger 421072
  91. GRB 100420A: EVLA radio observations
  92. GRB 100420A: Gemini discovery of infrared afterglow
  93. GRB 100423A: xinglong TNT optical upper limit
  94. GRB 100420A: Terskol optical upper limit
  95. GRB 100427A: Swift XRT and UVOT Upper Limits
  96. GRB 100427A: Fermi GBM detection
  97. GRB 100424a. Radio observations
  98. GRB 100418A: RTT150 optical observations
  99. GRB 100414A : EVLA Radio Detection
  100. GRB 100414A : WSRT Radio Detection

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