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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"

14930 results found.

  1. GRB 100728A: Swift detection of a burst
  2. GRB 100727A: Swift detection of a burst
  3. GRB 100724B: gamma-ray detection by AGILE
  4. GRB 100725B: Swift detection of a burst
  5. GRB 100725A: Swift detection of a burst
  6. GRB 100724B: Fermi GBM detection
  7. GRB 100724A, GROND detection of an afterglow candidate
  8. GRB 100724A: Swift detection of a burst
  9. GRB 100722A: Fermi GBM detection
  10. GRB 100719A: Swift detection of a burst
  11. GRB 100713A: TELMA and 1.5m OSN optical observations
  12. GRB100713A: Swift X-ray afterglow detection
  13. GRB 100707A: Suzaku WAM observation of the prompt emission
  14. GRB 100707A: Fermi LAT detection
  15. GRB 100707A: Fermi GBM detection
  16. GRB 100628A: Chandra observations
  17. GRB 100628A: Swift XRT/UVOT refined analysis
  18. Tentative redshift of GRB100704A from Swift-XRT data
  19. GRB 100703A: a short GRB detected by INTEGRAL
  20. GRB 100704A: Swift detection of a burst
  21. GRB 100701B: Fermi GBM detection
  22. GRB 100702A: Swift detection of a short burst
  23. XRF 100701A : MAXI/GSC detection of a probable XRF
  24. GRB 100213B: Detection of Fading Optical Afterglow
  25. GRB 100625A: Fermi GBM detection
  26. GRB100625A: GROND confirmation of constant source
  27. GRB 090709A: Host galaxy detection
  28. GRB 100628A: Swift XRT detection of a possible X-ray afterglow
  29. GRB 100625A: Magellan near-IR Observations
  30. GRB 100628A: Swift detection of a short hard burst
  31. GRB 100625A: Swift detection of a short hard burst
  32. GRB 100621A: Swift detection of a burst
  33. GRB 100619A: Fermi GBM detection
  34. GRB 100619A: Swift detection of a burst
  35. XRF 100616a : MAXI/GSC detection of a probable XRF
  36. GRB 100615A: Fermi GBM detection
  37. GRB 100615A: GROND observations, upper limits
  38. GRB 100615A: Swift detection of a burst
  39. GRB 100614A: Swift detection of a burst
  40. Radio detection of GRB100418a with ATCA
  41. GRB 100606A: Swift detection of a burst
  42. Swift detection of outburst from the SFXT IGR J18410-0535
  43. GRB 100528A: Faulkes Telescope North Detection
  44. GRB 100528A: GROND detection in all bands
  45. Swift UVOT and UVOT-enhanced XRT position for GRB 100528A
  46. GRB 100528A: SuperAGILE Localization of a Long GRB
  47. GRB 100526B: Swift detection of a probable GRB
  48. GRB 100526A: Swift detection of a burst
  49. GRB 100522A: Swift detection of a burst
  50. Update to the configuration of the Fermi-LAT onboard GRB search
  51. Swift Trigger 422437 is probably not a GRB
  52. GRB 100514A: Swift/UVOT Observations
  53. GRB 100514A: Swift detection of a burst
  54. GRB 100513A: Swift/UVOT upper limits
  55. GRB 100513A: Lick observations and R-band dropout
  56. GRB 100513A: Swift detection of a burst
  57. GRB 100510A: Fermi GBM detection/observation
  58. GRB 100511A: Fermi GBM detection/observation
  59. GRB 100510A: MAXI/GSC detection
  60. Trigger 421695: Swift detection of a possible burst
  61. GRB 100508A: GROND Detection of the optical afterglow
  62. GRB100508A: Swift/UVOT Detection of the Afterglow
  63. GRB 100508A: Swift detection of a burst
  64. GRB 100503A: Fermi GBM detection
  65. GRB 100504A: Swift detection of a burst
  66. Swift-BAT trigger 421072 is not astrophyical
  67. Trigger 421072: Possible Swift detection of a GRB or transient
  68. GRB 100420A: Gemini discovery of infrared afterglow
  69. GRB 100427A: Fermi GBM detection
  70. GRB 100414A : EVLA Radio Detection
  71. GRB 100414A : WSRT Radio Detection
  72. GRB 100424A: Gemini/NIRI H-band observations
  73. GRB 100425A: Swift detection of a burst
  74. GRB 100424A: Swift detection of a burst
  75. GRB 100418A: ROVOR optical measurements at 35 hours
  76. Swift-BAT refined analysis of trigger 420256
  77. GRB 100423B: Fermi GBM detection
  78. Trigger 420256: Swift detection of a possible GRB
  79. GRB 100423A: Swift detection of a burst
  80. Radio afterglow detection of GRB 100418A with the EVLA
  81. GRB 100414A: Radio Afterglow Detection with the Expanded VLA
  82. GRB 100418A: WSRT Radio Detection
  83. GRB100418A: REM possible afterglow detection
  84. GRB 100418A: Continuing Swift/UVOT Observations
  85. GRB 100418A: further GROND observations and light curve fit
  86. GRB 100418A: SARA second epoch
  87. GRB 100414A: Confirmation of the X-ray afterglow
  88. GRB 100418A: SMA submm detection
  89. GRB 100420A: Swift detection of a burst
  90. GRB 100418A PAIRITEL NIR Observations
  91. GRB 100418A: ROVOR optical afterglow detection
  92. GRB 100418A: host galaxy detection in the SDSS
  93. GRB 100418A: Swift detection of a burst with a possible optical afterglow
  94. GRB 100413A: Radio Afterglow Detection with the EVLA
  95. GRB 100414A: GROND Detection of the Optical Afterglow
  96. GRB 100414A: Swift-XRT detection of a possible X-ray afterglow
  97. GRB 100415A: MAXI/GSC detection of a probable GRB
  98. GRB 100414A: Fermi GBM detection
  99. GRB100414A: Fermi LAT detection
  100. GRB 100413B : Swift detection of a burst

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Download all Circulars as a .tar.gz archive (updated once a day):
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