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"

21089 results found.

  1. GRB 090117: GROND Upper Limits
  2. GRB090102: MAGIC telescope GeV observation
  3. GRB 090113: Swift UVOT upper limits
  4. GRB 090113: GROND Upper Limits
  5. GRB 090113: Observations from NOT
  6. GRB 090111: Swift UVOT Upper Limits
  7. GRB 090102: WSRT Radio Observations
  8. GRB 090107B: Swift XRT afterglow confirmation
  9. GRB 090107B: Swift/UVOT Observations
  10. GRB 090107B: Swift-XRT detection of possible afterglow
  11. GRB 090107B optical observations
  12. GRB 090102: optical decay
  13. GRB 090102: P60 Imaging and P200 Spectroscopy
  14. GRB 090102 Observations from IAC80
  15. GRB 090102: GROND observations of the optical afterglow
  16. Swift UVOT observations of GRB 090102
  17. GRB 090102: TAROT Calern observatory optical light curve
  18. GRB 090102: REM observations of a bright afterglow
  19. GRB 090102: TAROT Calern observatory optical observations
  20. GRB 081230: GROND confirmation of the afterglow
  21. GRB081230: Swift-XRT refined analysis
  22. GRB 081230 Swift/UVOT Observations
  23. GRB 081230: ROTSE-III Detection of Optical Counterpart
  24. GRB 081228: Swift/UVOT Upper Limits
  25. GRB 081228: detection by GROND
  26. GRB 081228: TAROT Calern observatory optical observations
  27. GRB 081226: Swift-XRT refined analysis
  28. GRB 081226A: Swift UVOT Upper Limits
  29. GRB 081226: Gemini-South spectrum of possible afterglow
  30. GRB 081226: Gemini-South imaging
  31. GRB 081226: GROND afterglow candidate
  32. GRB 081226: Swift detection of a possible short-hard burst
  33. GRB 080810: optical observations
  34. GRB 081211B: optical observations
  35. GRB 081224: Fermi GBM Detection & LAT Localization
  36. GRB 080810: optical observations
  37. GRB 081221: GROND observations
  38. GRB 081222: Gemini-N confirmation of redshift z=2.77
  39. GRB 081222: Gemini-South absorption redshift
  40. GRB081222: Swift/UVOT further observations
  41. GRB081221: Fermi GBM observation
  42. Swift/UVOT observations of GRB 081221
  43. GRB 081222: Faulkes Telescope South observations
  44. GRB 081221: Gemini-N nIR imaging
  45. GRB081222: Swift/UVOT detection of an optical afterglow
  46. GRB081203A: BTA observation
  47. GRB 081222: GROND Detection of the Optical/NIR Afterglow
  48. GRB081222: REM candidate afterglow
  49. GRB 081221: further NOT observations
  50. GRB 081221: NOT observations
  51. GRB081215A: Fermi-LAT observations
  52. GRB 081118: Zadko observations
  53. Fermi Trig Num 251059717 = SGR 0044+42: MASTER prompt optical observations
  54. GRB 0811215A: MASTER prompt optical observations
  55. GRB 081215A: Andromeda inside Fermi error box: MASTER observations
  56. GRB 0811215A: Andromeda inside Fermi error box: MASTER observations
  57. GRB 081210: optical observations
  58. GRB 081211B(?): Possible burst detection from Swift-BAT slew data
  59. GRB 081210: Xinglong TNT R band Upper Limits
  60. GRB 081210, SMARTS optical/IR observations
  61. GRB 081211: Swift XRT refined analysis
  62. GRB081203B: optical observations
  63. GRB 081203A: optical observations
  64. GRB 081128: afterglow observations
  65. GRB 081203B: Additional Gemini imaging
  66. GRB 081203B: Gemini observations
  67. GRB081203A: Optical observations at Ishigaki
  68. GRB 081128: Optical afterglow observations
  69. GRB 081204: GROND Observations
  70. GRB081203B: optical observations
  71. GRB 081204: Magellan observations
  72. GRB081203A: Radio upper limit at 15 GHz
  73. GRB 081204: Swift/UVOT Upper Limits
  74. GRB 081203A: Optical observations of Xinglong TNT telescope
  75. Swift-XRT observations of GRB 081203B
  76. GRB 081203B: optical observations
  77. Swift/UVOT detection of GRB081203B
  78. GRB 081203B: Swift-XRT candidate afterglow.
  79. GRB 081203A: optical observations
  80. Swift UVOT observations of GRB 081203A
  81. GRB 081130B: MASTER prompt optical observations
  82. Swift Trigger 335971: Swift/UVOT Observations
  83. GRB 081130: MASTER VWF prompt optical observations Fermi GRB
  84. GRB 081128A: optical observations
  85. GRB 081128: Liverpool Telescope afterglow confirmation
  86. GRB081128: optical observations
  87. GRB081128 : Lulin optical follow-ups
  88. GRB 081128: Optical observation of xinglong TNT
  89. GRB 081126: Swift observations continuing
  90. GRB 081126: Confirmation of the Optical Afterglow
  91. GRB 081126: Swift/UVOT Observations
  92. GRB 081126: optical observations
  93. GRB 081126: TAROT Calern observatory optical observations
  94. GRB 081121, SMARTS optical/IR afterglow observations
  95. GRB081121: Refined Swift/UVOT observations
  96. GRB 081121: Magellan Redshift
  97. GRB 081121: GROND observations
  98. GRB081121: Swift/UVOT observations
  99. GRB 081121: Swift detection of a burst
  100. GRB 081121: ROTSE-III Detection of Optical Counterpart

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