Skip to main content
JSON Notices via Email, Kafka Cron Jobs, Submitter Profile, GCN is Hiring. See news and announcements

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"

32552 results found.

  1. GRB 090102: GRT Optical Observation
  2. Konus-Wind observation of GRB 090102
  3. GRB 090102: Hobby-Eberly Telescope Spectroscopy
  4. GRB 090102: P60 Imaging and P200 Spectroscopy
  5. GRB 090102 Observations from IAC80
  6. GRB 090102: GROND observations of the optical afterglow
  7. Swift UVOT observations of GRB 090102
  8. GRB 090102: Swift-BAT refined analysis
  9. GRB 090102: Swift XRT refined analysis
  10. GRB 090102: NOT redshift
  11. GRB 090102: TAROT Calern observatory optical light curve
  12. GRB 090102: REM observations of a bright afterglow
  13. GRB 081230: GROND confirmation of the afterglow
  14. GRB 081230, Swift-BAT refined analysis
  15. GRB081230: Swift-XRT refined analysis
  16. GRB 081230 Swift/UVOT Observations
  17. GRB 081230: Swift/UVOT Detection of an Optical Afterglow
  18. GRB 081230: ROTSE-III Detection of Optical Counterpart
  19. GRB 081228: GROND confirmation of the optical/NIR afterglow
  20. GRB 081226B: Fermi GBM observation
  21. GRB 081228, Swift-BAT refined analysis
  22. VLA radio detection of GRB 081221
  23. GRB 081228: Swift/UVOT Upper Limits
  24. GRB 081228: Swift-XRT Team refined analysis
  25. GRB 081228: detection by GROND
  26. VLA radio observation of GRB 081221
  27. GRB 081226B: Swift XRT and UVOT upper limits
  28. GRB 081224: Suzaku WAM observation of the prompt emission
  29. GRB 081226: Swift-XRT refined analysis
  30. GRB 081226A: Swift UVOT Upper Limits
  31. GRB 081226: Second epoch of Gemini-South imaging
  32. GRB 081226A: Swift-BAT refined analysis
  33. GRB 081226: Gemini-South imaging
  34. GRB 081226: GROND afterglow candidate
  35. GRB 081226: ROTSE-III Optical Limits
  36. GRB 080810: optical observations
  37. GRB 081211B: optical observations
  38. GRB081224: LAT retraction
  39. GRB 081224: Swift-XRT observation
  40. GRB 081222: MITSuME optical observation
  41. GRB 080810: optical observations
  42. Konus-Wind observation of GRB 081222
  43. GRB 081221: GROND observations
  44. GRB 081222: Gemini-N confirmation of redshift z=2.77
  45. GRB 081222:Optical afterglow observation
  46. VLA radio upper limit on GRB 081222
  47. GRB 081222: Fermi GBM observation
  48. GRB 081222: Gemini-South absorption redshift
  49. GRB081222: Swift/UVOT further observations
  50. GRB 081221: Probable host galaxy in Keck imaging
  51. GRB 081222, Swift-BAT refined analysis
  52. GRB 081221, Swift-BAT refined analysis
  53. Konus-Wind observation of very bright GRB 081215A
  54. GRB 081222: Swift XRT refined analysis
  55. GRB081221: Fermi GBM observation
  56. Swift/UVOT observations of GRB 081221
  57. IPN triangulation of bright GRB 081215A
  58. GRB 081221: Swift-XRT Refined Analysis
  59. GRB 081221: pseudo-redshift (pz=0.7) from the spectral parameters of the prompt emission
  60. GRB 081222: Faulkes Telescope South observations
  61. GRB 081221: Gemini-N nIR imaging
  62. GRB081222, optical observation
  63. GRB081222: Swift/UVOT detection of an optical afterglow
  64. GRB081203A: BTA observation
  65. Konus-Wind observation of GRB 081221
  66. GRB 081222: GROND Detection of the Optical/NIR Afterglow
  67. GRB 081221: further NOT observations
  68. GRB 081221: NOT observations
  69. GRB 081211B: Further Swift-XRT analysis
  70. GRB 081216: Suzaku WAM observation of the prompt emission
  71. GRB 081216 : Fermi GBM observation
  72. GRB 081215A: Fermi GBM detection
  73. GRB 081211B - possibly a short burst with extended emission
  74. GRB 081118: Zadko observations
  75. Fermi Trig Num 251059717 = SGR 0044+42: MASTER prompt optical observations
  76. GRB 081215A: Gamma Repeater?
  77. Possible GRB 081211B: Swift/UVOT Upper Limits
  78. GRB 081210: optical observations
  79. Possible GRB 081211B - Swift-XRT analysis
  80. GRB 081209: Fermi GBM detection
  81. GRB 081007: Detection of a Supernova
  82. GRB 081210: Xinglong TNT R band Upper Limits
  83. GRB 081210, SMARTS optical/IR observations
  84. GRB 081211: Swift-BAT refined analysis
  85. GRB 081211: Swift XRT refined analysis
  86. GRB 081211: Swift/UVOT detection of an optical afterglow
  87. GRB 081210: Swift/UVOT refined analysis
  88. GRB 081210: Swift-XRT refined analysis
  89. GRB081203B: optical observations
  90. GRB 081210: Swift-BAT refined analysis
  91. Konus-Wind observation of GRB 081209
  92. GRB 081203A: optical observations
  93. Radio observation of GRB 081121 with ATCA
  94. Radio observation of GRB 081118 with ATCA
  95. GRB 081128: afterglow observations
  96. GRB 081203B: Suzaku WAM observation of the prompt emission
  97. GRB 081203B: Additional Gemini imaging
  98. Radio observation of GRB 081109 with ATCA
  99. Radio observation of GRB 081104 with ATCA
  100. Radio observation of GRB 081029 with ATCA

Advanced

Download all Circulars as a .tar.gz archive (updated once a day):
Questions or comments?
Contact GCN directly.
Have you found a bug in GCN?
Open an issue.
Want to contribute code to GCN?
Get involved on GitHub.

gcn.nasa.gov

A service of the Astrophysics Science Division at NASA Goddard Space Flight Center

Looking for U.S. government information and services? Visit USA.gov