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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"

45902 results found.

  1. GRB 100504A: SARA-South Upper Limit
  2. GRB 100503A: Fermi GBM detection
  3. GRB 100504A: UVOT-enhanced XRT position
  4. GRB 100504A: Swift detection of a burst
  5. Swift-BAT trigger 421072 is not astrophyical
  6. INTEGRAL observations of Swift GRB trigger 421072
  7. GRB100423A : Suzaku WAM observation of the prompt emission
  8. Trigger 421072: Possible Swift detection of a GRB or transient
  9. GRB 100420A: EVLA radio observations
  10. GRB 100420A: Gemini discovery of infrared afterglow
  11. GRB 100423A: xinglong TNT optical upper limit
  12. GRB 100420A: Terskol optical upper limit
  13. GRB 100427A: Swift XRT and UVOT Upper Limits
  14. GRB 100427A: Fermi GBM detection
  15. GRB 100424a. Radio observations
  16. GRB 100418A: RTT150 optical observations
  17. GRB 100427A detected in ground analysis of Swift BAT data
  18. GRB 100414A : EVLA Radio Detection
  19. GRB 100414A : WSRT Radio Detection
  20. Konus-Wind observation of GRB 100423A
  21. GRB 100423A: CrAO optical observations
  22. GRB 100418A: Terskol optical observations
  23. GRB 100424A: CrAO optical observations
  24. GRB 100424A: NIR Afterglow Confirmation
  25. GRB 100425A: Swift XRT refined analysis
  26. GRB 100424A: Gemini/NIRI H-band observations
  27. GRB100425A: Swift/UVOT Upper Limits
  28. GRB 100424A: Swift/UVOT Upper Limits
  29. GRB 100424A: Liverpool Telescope Upper Limits
  30. GRB 100425A: Enhanced Swift-XRT position
  31. GRB 100425A: Swift-BAT refined analysis
  32. GRB 100425A: VLT/X-shooter redshift
  33. GRB 100425A: GROND afterglow observation
  34. GRB 100424A: Gemini/NIRI Candidate Afterglow
  35. GRB 100424A: D50 optical limits
  36. GRB 100425A: candidate optical afterglow from the VLT
  37. GRB100424A: MITSuME optical upper limits
  38. GRB100423A: MITSuME optical upper limits
  39. GRB 100424A : Lulin early z'-band upper limit
  40. GRB 100424A: GROND Upper Limits
  41. GRB 100424A: PAIRITEL NIR Upper Limits
  42. GRB 100424A: Swift-XRT refined analysis
  43. GRB 100425A: Swift detection of a burst
  44. GRB 100424A: WHT z-band observations
  45. GRB 100424A: NOT optical observations
  46. GRB 100424A, Swift-BAT refined analysis
  47. GRB 100424A: Enhanced Swift-XRT position
  48. GRB 100424A: Prompt enhanced Swift-XRT position.
  49. GRB 100424A: Swift detection of a burst
  50. GRB 100420A: GRT Optical Observation
  51. GRB 100418A: ROVOR optical measurements at 35 hours
  52. Swift-BAT refined analysis of trigger 420256
  53. Swift Trigger 420256: D50 optical limits
  54. GRB 100418A: Possible Evidence for a Supernova
  55. GRB 100420A: Swift-BAT refined analysis
  56. GRB 100423B: Fermi GBM detection
  57. GRB 100423A: Swift-BAT refined analysis
  58. Swift Trigger 420256: IAC80 R-band observations
  59. Swift Trigger 420256: BOOTES-2 observations
  60. Swift Trigger 420256: ROTSE-III Optical Limits
  61. Trigger 420256: Swift detection of a possible GRB
  62. GRB 100423A: Skynet/PROMPT Detections
  63. GRB 100423A: GROND discovery of afterglow
  64. GRB 100423A: Swift detection of a burst
  65. Radio afterglow detection of GRB 100418A with the EVLA
  66. GRB 100414A: Radio Afterglow Detection with the Expanded VLA
  67. GRB 100418A: Continued PAIRITEL NIR Observations
  68. GRB 100418A: WSRT Radio Detection
  69. GRB100418A: REM possible afterglow detection
  70. GRB 100418A: Continuing Swift/UVOT Observations
  71. GRB 100418A: further GROND observations and light curve fit
  72. GRB 100418A: RTT150 optical observations
  73. GRB100420A: MITSuME optical upper limits
  74. GRB 100414A: CFHT optical observations
  75. GRB 100420A: Swift/UVOT Upper Limits
  76. GRB 100420A: XRT refined analysis
  77. GRB 100420A: Enhanced Swift-XRT position
  78. GRB 100418A: SARA second epoch
  79. GRB 100420A: SARA Upper Limits
  80. GRB 100418A: RTT150 observations during the optical afterglow maximum
  81. GRB 100418A: optical observations
  82. GRB 100418A: MASTER-Net optical observations
  83. GRB 100414A: Confirmation of the X-ray afterglow
  84. GRB 100418A: VLT optical observations
  85. GRB 100418A: SMA submm detection
  86. GRB 100420A: ROTSE-III Optical Limits
  87. GRB 100420A: Swift detection of a burst
  88. GRB 100418A PAIRITEL NIR Observations
  89. GRB 100418A: ROVOR optical afterglow detection
  90. GRB 100418A: Swift/UVOT Observations
  91. GRB 100418A: Gemini-N redshift confirmation
  92. GRB 100413A: GMRT observation of radio afterglow
  93. GRB 100418A: Swift-XRT Refined Analysis
  94. GRB 100418A: host galaxy detection in the SDSS
  95. GRB100418A: VLT/X-shooter redshift and photometry
  96. GRB 100418A: SARA observations
  97. GRB100414A: SAO RAS optical observations
  98. GRB 100418A: GROND observations; missing author list added
  99. GRB 100418A: GROND observations
  100. GRB 100418A: Swift-BAT refined analysis

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