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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"

38153 results found.

  1. GRB 100518A: Faulkes Telescope North Afterglow Candidate
  2. GRB 100518A: Swift target of opportunity observation of the INTEGRAL burst
  3. GRB 100513A: MITSuME Akeno Optical Observation
  4. Swift-BAT trigger 422437 is not anything astrophysical
  5. GRB 100518A: a long GRB detected with INTEGRAL
  6. Swift Trigger 422437 is probably not a GRB
  7. Fermi/GBM trigger 295791986 - unreliable location
  8. GRB 100517A: MASTER-Net wide field camera prompt optical observations
  9. GRB 100513A: EVLA radio observation
  10. GRB 100514A: optical afterglow confirmation
  11. GRB 100514A: Swift/UVOT Observations
  12. GRB 100514A: YNAO-GMG observations
  13. GRB 100514A: Swift XRT refined analysis
  14. GRB 100514A: MASTER-Net optical observations
  15. GRB 100514A: Enhanced Swift-XRT position
  16. GRB 100514A: Swift-BAT refined analysis
  17. GRB 100514A: Faulkes Telescope South observations
  18. GRB 100514A: Swift detection of a burst
  19. GRB 100513A: Faulkes Telescope South observations
  20. GRB 100513A: Swift/UVOT upper limits
  21. GRB 100513A, RIMOTS optical upper limits
  22. GRB 100513A: Swift XRT refined analysis
  23. GRB 100513A: Swift-BAT refined analysis
  24. GRB 100513A: Gemini/GMOS Spectroscopic Redshift
  25. GRB 100513A: Enhanced Swift-XRT position
  26. GRB 100513A: Lick observations and R-band dropout
  27. GRB 100513A: PAIRITEL continued observations and confirmation of fading
  28. GRB 100513A: SARA-N Upper Limit
  29. GRB 100513A: PAIRITEL NIR afterglow candidate
  30. GRB 100513A: Swift detection of a burst
  31. GRB 100510A: Fermi GBM detection/observation
  32. GRB 100511A: Fermi GBM detection/observation
  33. GRB 100511A: Super-LOTIS early observations
  34. Swift-BAT trigger 421695 is likely not astrophysical
  35. GRB100504A: Optical upper limits at IAO
  36. GRB 100510A: MAXI/GSC detection
  37. GRB 100511A, RIMOTS optical upper limits
  38. GRB100508A: Further Swift/UVOT Observations
  39. GRB100503A: Suzaku WAM observation of the prompt emission
  40. GRB 100508A: GROND Detection of the optical afterglow
  41. GRB 100508A: Swift-XRT Refined analysis
  42. GRB 100508A: Swift-BAT refined analysis
  43. GRB 100508A: Enhanced Swift-XRT position
  44. GRB100508A: Swift/UVOT Detection of the Afterglow
  45. GRB 100508A: ROTSE-III Optical Limits
  46. GRB 100508A: Swift detection of a burst
  47. GRB 100418A: Keck imaging
  48. GRB 100418A: RTT150 optical observations
  49. Fermi Gamma-ray Burst Monitor trigger 294712621 is not a GRB
  50. GRB 100504A: Fermi GBM observation
  51. GRB 100504A: Swift/UVOT Observations
  52. GRB 100418A: Flattening of the Swift/UVOT Optical Light Curve
  53. GRB 100504A: Swift-XRT refined analysis
  54. GRB 100504A: Enhanced Swift-XRT position
  55. GRB 100504A: GROND Upper limits
  56. GRB 100504A: Swift-BAT refined analysis
  57. GRB 100504A: SARA-South Upper Limit
  58. GRB 100503A: Fermi GBM detection
  59. GRB 100504A: UVOT-enhanced XRT position
  60. GRB 100504A: Swift detection of a burst
  61. Swift-BAT trigger 421072 is not astrophyical
  62. INTEGRAL observations of Swift GRB trigger 421072
  63. GRB100423A : Suzaku WAM observation of the prompt emission
  64. Trigger 421072: Possible Swift detection of a GRB or transient
  65. GRB 100420A: EVLA radio observations
  66. GRB 100420A: Gemini discovery of infrared afterglow
  67. GRB 100423A: xinglong TNT optical upper limit
  68. GRB 100420A: Terskol optical upper limit
  69. GRB 100427A: Swift XRT and UVOT Upper Limits
  70. GRB 100427A: Fermi GBM detection
  71. GRB 100424a. Radio observations
  72. GRB 100418A: RTT150 optical observations
  73. GRB 100427A detected in ground analysis of Swift BAT data
  74. GRB 100414A : EVLA Radio Detection
  75. GRB 100414A : WSRT Radio Detection
  76. Konus-Wind observation of GRB 100423A
  77. GRB 100423A: CrAO optical observations
  78. GRB 100418A: Terskol optical observations
  79. GRB 100424A: CrAO optical observations
  80. GRB 100424A: NIR Afterglow Confirmation
  81. GRB 100425A: Swift XRT refined analysis
  82. GRB 100424A: Gemini/NIRI H-band observations
  83. GRB100425A: Swift/UVOT Upper Limits
  84. GRB 100424A: Swift/UVOT Upper Limits
  85. GRB 100424A: Liverpool Telescope Upper Limits
  86. GRB 100425A: Enhanced Swift-XRT position
  87. GRB 100425A: Swift-BAT refined analysis
  88. GRB 100425A: VLT/X-shooter redshift
  89. GRB 100425A: GROND afterglow observation
  90. GRB 100424A: Gemini/NIRI Candidate Afterglow
  91. GRB 100424A: D50 optical limits
  92. GRB 100425A: candidate optical afterglow from the VLT
  93. GRB100424A: MITSuME optical upper limits
  94. GRB100423A: MITSuME optical upper limits
  95. GRB 100424A : Lulin early z'-band upper limit
  96. GRB 100424A: GROND Upper Limits
  97. GRB 100424A: PAIRITEL NIR Upper Limits
  98. GRB 100424A: Swift-XRT refined analysis
  99. GRB 100425A: Swift detection of a burst
  100. GRB 100424A: WHT z-band observations

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