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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"

36190 results found.

  1. Trigger 421072: Possible Swift detection of a GRB or transient
  2. GRB 100420A: EVLA radio observations
  3. GRB 100420A: Gemini discovery of infrared afterglow
  4. GRB 100423A: xinglong TNT optical upper limit
  5. GRB 100420A: Terskol optical upper limit
  6. GRB 100427A: Swift XRT and UVOT Upper Limits
  7. GRB 100427A: Fermi GBM detection
  8. GRB 100424a. Radio observations
  9. GRB 100418A: RTT150 optical observations
  10. GRB 100427A detected in ground analysis of Swift BAT data
  11. GRB 100414A : EVLA Radio Detection
  12. GRB 100414A : WSRT Radio Detection
  13. Konus-Wind observation of GRB 100423A
  14. GRB 100423A: CrAO optical observations
  15. GRB 100418A: Terskol optical observations
  16. GRB 100424A: CrAO optical observations
  17. GRB 100424A: NIR Afterglow Confirmation
  18. GRB 100425A: Swift XRT refined analysis
  19. GRB 100424A: Gemini/NIRI H-band observations
  20. GRB100425A: Swift/UVOT Upper Limits
  21. GRB 100424A: Swift/UVOT Upper Limits
  22. GRB 100424A: Liverpool Telescope Upper Limits
  23. GRB 100425A: Enhanced Swift-XRT position
  24. GRB 100425A: Swift-BAT refined analysis
  25. GRB 100425A: VLT/X-shooter redshift
  26. GRB 100425A: GROND afterglow observation
  27. GRB 100424A: Gemini/NIRI Candidate Afterglow
  28. GRB 100424A: D50 optical limits
  29. GRB 100425A: candidate optical afterglow from the VLT
  30. GRB100424A: MITSuME optical upper limits
  31. GRB100423A: MITSuME optical upper limits
  32. GRB 100424A : Lulin early z'-band upper limit
  33. GRB 100424A: GROND Upper Limits
  34. GRB 100424A: PAIRITEL NIR Upper Limits
  35. GRB 100424A: Swift-XRT refined analysis
  36. GRB 100425A: Swift detection of a burst
  37. GRB 100424A: WHT z-band observations
  38. GRB 100424A: NOT optical observations
  39. GRB 100424A, Swift-BAT refined analysis
  40. GRB 100424A: Enhanced Swift-XRT position
  41. GRB 100424A: Prompt enhanced Swift-XRT position.
  42. GRB 100424A: Swift detection of a burst
  43. GRB 100420A: GRT Optical Observation
  44. GRB 100418A: ROVOR optical measurements at 35 hours
  45. GRB 100418A: Possible Evidence for a Supernova
  46. GRB 100420A: Swift-BAT refined analysis
  47. GRB 100423B: Fermi GBM detection
  48. GRB 100423A: Swift-BAT refined analysis
  49. Trigger 420256: Swift detection of a possible GRB
  50. GRB 100423A: Skynet/PROMPT Detections
  51. GRB 100423A: GROND discovery of afterglow
  52. GRB 100423A: Swift detection of a burst
  53. Radio afterglow detection of GRB 100418A with the EVLA
  54. GRB 100414A: Radio Afterglow Detection with the Expanded VLA
  55. GRB 100418A: Continued PAIRITEL NIR Observations
  56. GRB 100418A: WSRT Radio Detection
  57. GRB100418A: REM possible afterglow detection
  58. GRB 100418A: Continuing Swift/UVOT Observations
  59. GRB 100418A: further GROND observations and light curve fit
  60. GRB 100418A: RTT150 optical observations
  61. GRB100420A: MITSuME optical upper limits
  62. GRB 100414A: CFHT optical observations
  63. GRB 100420A: Swift/UVOT Upper Limits
  64. GRB 100420A: XRT refined analysis
  65. GRB 100420A: Enhanced Swift-XRT position
  66. GRB 100418A: SARA second epoch
  67. GRB 100420A: SARA Upper Limits
  68. GRB 100418A: RTT150 observations during the optical afterglow maximum
  69. GRB 100418A: optical observations
  70. GRB 100418A: MASTER-Net optical observations
  71. GRB 100414A: Confirmation of the X-ray afterglow
  72. GRB 100418A: VLT optical observations
  73. GRB 100418A: SMA submm detection
  74. GRB 100420A: ROTSE-III Optical Limits
  75. GRB 100420A: Swift detection of a burst
  76. GRB 100418A PAIRITEL NIR Observations
  77. GRB 100418A: ROVOR optical afterglow detection
  78. GRB 100418A: Swift/UVOT Observations
  79. GRB 100418A: Gemini-N redshift confirmation
  80. GRB 100413A: GMRT observation of radio afterglow
  81. GRB 100418A: Swift-XRT Refined Analysis
  82. GRB 100418A: host galaxy detection in the SDSS
  83. GRB100418A: VLT/X-shooter redshift and photometry
  84. GRB 100418A: SARA observations
  85. GRB100414A: SAO RAS optical observations
  86. GRB 100418A: GROND observations; missing author list added
  87. GRB 100418A: GROND observations
  88. GRB 100418A: Swift-BAT refined analysis
  89. GRB 100418A: Enhanced Swift-XRT position
  90. GRB 100418A: ROTSE-III Optical Limits
  91. GRB 100418A: Swift detection of a burst with a possible optical afterglow
  92. GRB 100413A: Radio Afterglow Detection with the EVLA
  93. GRB 100414A: Suzaku WAM observation of the prompt emission
  94. GRB 100414A: Swift/UVOT Observations
  95. GRB 100414A: Gemini-N observation (correction)
  96. GRB 100414A: GROND Detection of the Optical Afterglow
  97. GRB 100414A: Gemini-N candidate and redshift
  98. GRB 100414A: Enhanced Swift-XRT position of candidate afterglow
  99. GRB 100413A: Suzaku WAM observation of the prompt emission
  100. GRB 100414A: Palomar Transient Factory Observations

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