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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"

6804 results found.

  1. GRB 100924A: Fermi GBM observation
  2. GRB 100915B: Fermi GBM observation
  3. GRB 100915A: Swift/UVOT Upper Limits
  4. GRB 100915A: Swift-XRT refined analysis
  5. GRB 100910A: Fermi GBM detection
  6. GRB 100909A: Swift-XRT refined analysis
  7. GRB 100901A: optical observation in Maidanak, break confirmation
  8. GRB 100909A: Swift target of opportunity observation
  9. GRB100906A: R band observations
  10. GRB 100906A: Fermi GBM observation
  11. GRB 100906A: TLS Monitoring
  12. GRB 100906A: Swift-XRT refined analysis
  13. GRB 100906A: TLS Multicolor Observations
  14. GRB 100901A: TLS observations, SDSS calibration, decay slope
  15. GRB 100905A: Swift-XRT refined analysis.
  16. GRB 100902A: Swift XRT refined analysis
  17. GRB 100901A: TLS Observations: Break?
  18. GRB 100901A: Swift-XRT Team refined analysis
  19. GRB 100901A - NOT optical observation
  20. GRB 100901A: Swift-BAT refined analysis
  21. GRB 100725B: Maidanak optical upper limit
  22. GRB 100823A: Swift XRT refined analysis
  23. GRB 100814B: Fermi GBM detection
  24. GRB 100816A: Fermi GBM observation
  25. GRB100816A Swift-XRT refined analysis
  26. GRB 100816A: CQUEAN riz-band Detection, Host Galaxy?
  27. GRB 100814A: Fermi GBM observation
  28. GRB 100814A: Swift-XRT refined analysis
  29. GRB 100807A: Swift XRT refined analysis
  30. GRB 100805A: Swift-XRT Refined Analysis
  31. GRB 100805A: GRAS 002 optical observations
  32. GRB 100802A: Fermi GBM observation
  33. GRB 100728B: optical photometry of ISON-NM
  34. GRB 100713A: second epoch Maidanak optical observation
  35. GRB 100802A: XRT refined analysis
  36. GRB 100728B: Lick Observations
  37. GRB 100728B: Swift-XRT Refined Analysis
  38. GRB 100728B: Fermi GBM observation
  39. GRB 100728A: Swift-XRT refined analysis
  40. GRB 100728A: Fermi GBM observation
  41. GRB 100727A: Swift XRT refined analysis
  42. GRB 100727A: Fermi GBM observation
  43. GRB100727A: MOA optical upper limit
  44. GRB 100725B: refined XRT analysis
  45. GRB 100725B: Swift/UVOT Upper Limits
  46. GRB 100725A: Swift XRT refined analysis
  47. GRB 100724B: Fermi LAT and GBM analysis
  48. GRB 100724B: Fermi GBM detection
  49. GRB 100724A: Swift XRT refined analysis
  50. GRB 100722A: Fermi GBM detection
  51. GRB 100713A: optical observation in Maidanak
  52. GRB 100713A: Swift XRT refined analysis
  53. GRB 100713A : IRSF/SIRIUS NIR upper limits
  54. GRB100713A: Swift X-ray afterglow detection
  55. GRB 100707A: Fermi LAT detection
  56. GRB 100707A: Fermi GBM detection
  57. GRB 100628A: Swift XRT/UVOT refined analysis
  58. GRB 100704A: Swift XRT refined analysis
  59. GRB 100704A: Fermi GBM observation
  60. GRB 100625A: Fermi GBM detection
  61. GRB 100628A: Swift XRT refined position
  62. GRB100628A : MOA optical upper limit
  63. GRB 100628A: Swift XRT detection of a possible X-ray afterglow
  64. GRB 100625A : IRSF/SIRIUS NIR upper limit
  65. GRB 100625A: Swift-XRT Team refined analysis
  66. GRB 100621A: IRSF/SIRIUS NIR Observation
  67. GRB 100621A: Swift XRT refined analysis
  68. GRB 100619A: Fermi GBM detection
  69. GRB 100619A: Swift/UVOT Upper Limits
  70. GRB 100619A: Swift-XRT refind analysis
  71. GRB 100615A: Swift-XRT refined analysis
  72. GRB 100614A: Swift-XRT refined analysis
  73. GRB 100615A: PAIRITEL NIR Upper Limits
  74. GRB 100606A Swift-XRT refined analysis
  75. GRB 100606A: Prompt enhanced Swift-XRT position
  76. GRB 100111A: Maidanak optical observations
  77. Swift UVOT and UVOT-enhanced XRT position for GRB 100528A
  78. GRB 100528A: Fermi GBM observation
  79. GRB 100526B: Swift-XRT confirmation of fading afterglow
  80. GRB 100526A: Swift XRT refined analysis
  81. GRB 100522A: Fermi GBM observation
  82. GRB 100522A: Swift XRT refined analysis
  83. GRB 100522A: NIR observations from CAHA
  84. GRB 100518A: Swift-XRT refined analysis
  85. GRB 100518A: Swift target of opportunity observation of the INTEGRAL burst
  86. GRB 100514A: Swift XRT refined analysis
  87. GRB 100513A: Swift XRT refined analysis
  88. GRB 100513A: Lick observations and R-band dropout
  89. GRB 100513A: PAIRITEL continued observations and confirmation of fading
  90. GRB 100513A: PAIRITEL NIR afterglow candidate
  91. GRB 100510A: Fermi GBM detection/observation
  92. GRB 100511A: Fermi GBM detection/observation
  93. Swift-BAT trigger 421695 is likely not astrophysical
  94. GRB 100508A: Swift-XRT Refined analysis
  95. GRB 100504A: Fermi GBM observation
  96. GRB 100418A: Flattening of the Swift/UVOT Optical Light Curve
  97. GRB 100504A: Swift-XRT refined analysis
  98. GRB 100503A: Fermi GBM detection
  99. GRB 100427A: Swift XRT and UVOT Upper Limits
  100. GRB 100425A: Swift XRT refined analysis

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