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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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.

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subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

45471 results found.

  1. GRB 100424A: Gemini/NIRI Candidate Afterglow
  2. GRB 100424A: D50 optical limits
  3. GRB 100425A: candidate optical afterglow from the VLT
  4. GRB100424A: MITSuME optical upper limits
  5. GRB100423A: MITSuME optical upper limits
  6. GRB 100424A : Lulin early z'-band upper limit
  7. GRB 100424A: GROND Upper Limits
  8. GRB 100424A: PAIRITEL NIR Upper Limits
  9. GRB 100424A: Swift-XRT refined analysis
  10. GRB 100425A: Swift detection of a burst
  11. GRB 100424A: WHT z-band observations
  12. GRB 100424A: NOT optical observations
  13. GRB 100424A, Swift-BAT refined analysis
  14. GRB 100424A: Enhanced Swift-XRT position
  15. GRB 100424A: Prompt enhanced Swift-XRT position.
  16. GRB 100424A: Swift detection of a burst
  17. GRB 100420A: GRT Optical Observation
  18. GRB 100418A: ROVOR optical measurements at 35 hours
  19. Swift-BAT refined analysis of trigger 420256
  20. Swift Trigger 420256: D50 optical limits
  21. GRB 100418A: Possible Evidence for a Supernova
  22. GRB 100420A: Swift-BAT refined analysis
  23. GRB 100423B: Fermi GBM detection
  24. GRB 100423A: Swift-BAT refined analysis
  25. Swift Trigger 420256: IAC80 R-band observations
  26. Swift Trigger 420256: BOOTES-2 observations
  27. Swift Trigger 420256: ROTSE-III Optical Limits
  28. Trigger 420256: Swift detection of a possible GRB
  29. GRB 100423A: Skynet/PROMPT Detections
  30. GRB 100423A: GROND discovery of afterglow
  31. GRB 100423A: Swift detection of a burst
  32. Radio afterglow detection of GRB 100418A with the EVLA
  33. GRB 100414A: Radio Afterglow Detection with the Expanded VLA
  34. GRB 100418A: Continued PAIRITEL NIR Observations
  35. GRB 100418A: WSRT Radio Detection
  36. GRB100418A: REM possible afterglow detection
  37. GRB 100418A: Continuing Swift/UVOT Observations
  38. GRB 100418A: further GROND observations and light curve fit
  39. GRB 100418A: RTT150 optical observations
  40. GRB100420A: MITSuME optical upper limits
  41. GRB 100414A: CFHT optical observations
  42. GRB 100420A: Swift/UVOT Upper Limits
  43. GRB 100420A: XRT refined analysis
  44. GRB 100420A: Enhanced Swift-XRT position
  45. GRB 100418A: SARA second epoch
  46. GRB 100420A: SARA Upper Limits
  47. GRB 100418A: RTT150 observations during the optical afterglow maximum
  48. GRB 100418A: optical observations
  49. GRB 100418A: MASTER-Net optical observations
  50. GRB 100414A: Confirmation of the X-ray afterglow
  51. GRB 100418A: VLT optical observations
  52. GRB 100418A: SMA submm detection
  53. GRB 100420A: ROTSE-III Optical Limits
  54. GRB 100420A: Swift detection of a burst
  55. GRB 100418A PAIRITEL NIR Observations
  56. GRB 100418A: ROVOR optical afterglow detection
  57. GRB 100418A: Swift/UVOT Observations
  58. GRB 100418A: Gemini-N redshift confirmation
  59. GRB 100413A: GMRT observation of radio afterglow
  60. GRB 100418A: Swift-XRT Refined Analysis
  61. GRB 100418A: host galaxy detection in the SDSS
  62. GRB100418A: VLT/X-shooter redshift and photometry
  63. GRB 100418A: SARA observations
  64. GRB100414A: SAO RAS optical observations
  65. GRB 100418A: GROND observations; missing author list added
  66. GRB 100418A: GROND observations
  67. GRB 100418A: Swift-BAT refined analysis
  68. GRB 100418A: Enhanced Swift-XRT position
  69. GRB 100418A: ROTSE-III Optical Limits
  70. GRB 100418A: Swift detection of a burst with a possible optical afterglow
  71. GRB 100413A: Radio Afterglow Detection with the EVLA
  72. GRB 100414A: Suzaku WAM observation of the prompt emission
  73. GRB 100414A: Swift/UVOT Observations
  74. GRB 100414A: Gemini-N observation (correction)
  75. GRB 100414A: GROND Detection of the Optical Afterglow
  76. GRB 100414A: Gemini-N candidate and redshift
  77. GRB 100414A: Enhanced Swift-XRT position of candidate afterglow
  78. GRB 100413A: Suzaku WAM observation of the prompt emission
  79. GRB 100414A: Palomar Transient Factory Observations
  80. GRB 100413B: Swift Confirmation of Burst
  81. GRB 100414A: Swift-XRT detection of a possible X-ray afterglow
  82. GRB 100413A: Swift-BAT final refined analysis
  83. GRB 100414A: IPN Localization
  84. Konus-Wind observation of GRB 100414A (correction to GCN 10597)
  85. Konus-Wind observation of GRB 100414B
  86. GRB 100415A: MAXI/GSC detection of a probable GRB
  87. GRB 100414A: Fermi GBM detection
  88. GRB100414A: Fermi LAT detection
  89. GRB 100413B : Swift detection of a burst
  90. GRB 100413A: GROND Upper limits
  91. GRB 100413A: Swift/UVOT Upper Limits
  92. Konus-Wind observation of GRB 100413A
  93. GRB 100413A: Faulkes Telescope South observations
  94. Tentative redshift of GRB100413A from X-ray data
  95. GRB 100413A: SARA upper limit
  96. GRB 100413A: Swift-XRT Refined Analysis
  97. GRB 100413A: Swift-BAT initial refined analysis
  98. GRB 100413A: Enhanced Swift-XRT position
  99. GRB 100413: xinglong TNT optical upper limit
  100. GRB 100413A: MASTER-Net optical observations

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