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"

32720 results found.

  1. GRB 060206: SOAR Detections
  2. GRB 050826: Optical Afterglow and Host Galaxy
  3. GRB 060210: Further refined analysis of the Swift-BAT burst
  4. GRB 060211B: Swift/BAT refined analysis
  5. GRB060210: Swift/UVOT Upper Limits
  6. GRB 060211B: Swift-XRT Team refined analysis
  7. GRB060211b: optical observation
  8. GRB060211B: Swift/XRT position
  9. GRB 060210: Optical Observations
  10. GRB 060211A: Swift XRT Team Refined Analysis
  11. GRB060211: Faulkes North observation
  12. GRB 060211: ROTSE-III Optical Limits
  13. GRB 060210: Refined analysis of the Swift-BAT burst
  14. GRB060210: Swift XRT Refined Analysis
  15. GRB060206, optical observations
  16. GRB060210: Optical Observations
  17. GRB060210: Gemini absorption spectroscopy
  18. GRB060210: Early Optical Observations
  19. GRB060210:Faulkes Telescope North Afterglow Confirmation
  20. GRB 060206: Swift/UVOT Observations
  21. GRB060209: RTT150 optical observations
  22. GRB 060209 : TAROT optical observation
  23. GRB 060206: near-infrared observations (JK' imaging)
  24. GRB 060206: WSRT Radio Observations
  25. GRB 060203: Swift/UVOT upper limits
  26. GRB 060206: TTT Observations
  27. GRB 060206: More PROMPT Detections
  28. GRB 060121 : WIDGET Pre-trigger limit
  29. GRB 060206: Tenagra II Observations
  30. GRB 060206: PROMPT Detections
  31. GRB060204a: Swift XRT Source is not GRB Afterglow
  32. GRB 060206: optical observations at Asiago
  33. Orphan GRB Afterglow candidate
  34. GRB 060204b: pseudo-z from spectral parameters of the prompt emission
  35. GRB 060206: Subaru/FOCAS optical spectroscopy
  36. GRB 060206: IR Detection of the Afterglow
  37. GRB 060206: Lick 3m Spectroscopy
  38. GRB 060204A: ROSAT Pointing
  39. GRB 060206: Super-LOTIS observations
  40. GRB060204A: Swift/UVOT observations
  41. GRB 060206: Swift-BAT refined analysis
  42. GRB060206: SDSS Pre-Burst Observations
  43. GRB060206: Swift XRT Refined Analysis
  44. GRB060206: Liverpool Telescope observation
  45. GRB 060206: Spectroscopic Redshift
  46. GRB060206: P60 Optical Observations
  47. GRB 060206: KAIT observations
  48. GRB060206: Swift XRT Position
  49. GRB060206: SARA Detection
  50. GRB 060206: RAPTOR observations of afterglow candidate variability.
  51. GRB 060206: High redshift burst
  52. GRB060204a: Swift XRT Detection of an Afterglow Candidate
  53. GRB060206 - Swift UVOT Confirmation of Optical Afterglow
  54. GRB060206: Optical afterglow
  55. GRB 060204C: XRT analysis of Swift J061223.0+701243.9
  56. GRB060203: WHT Z-band observations
  57. BAT GRB 060204C is probably not a GRB
  58. GRB060204C: optical observation
  59. GRB 060204B: BVRi-band detections of optical afterglow
  60. GRB 060204A: Swift XRT upper limit
  61. GRB 060204A: FRAM optical observations
  62. GRB060204B: Swift/UVOT refined analysis
  63. GRB 060204C: optical observations
  64. Swift XRT Observation of GRB 060204C
  65. GRB 060204B: Swift-BAT refined analysis
  66. GRB 060204B: ART early limit
  67. GRB060204B: Swift XRT Team Refined Analysis
  68. GRB 060204C: OSN limits
  69. GRB 060204b: Keck/LRIS Afterglow Confirmation
  70. GRB 060204C: BOOTES-IR optical limits
  71. GRB 060204C: Liverpool Telescopes optical limit
  72. GRB 060204C: ROTSE-III Optical Limits
  73. GRB 060124: Radio Observations
  74. GRB060204B: Faulkes OT candidate
  75. GRB 060204B: ART optical limit
  76. GRB 060204A: further INTEGRAL results
  77. GRB060204B, optical observation
  78. GRB 060203: Swift-BAT refined analysis
  79. GRB 060202: UKIRT/WFCAM K-band and KeckI/LRIS I-band Observation
  80. GRB 060203: RTT150 optical observations
  81. GRB060203 - Swift UVOT observation
  82. Swift-BAT trigger is GRB 060203
  83. GRB 060203: IR Counterpart
  84. GRB060203: Observations with SARA
  85. GRB 060203: P60 Confirmation of Optical Afterglow
  86. Possible GRB 060203: candidate optical counterpart
  87. Swift BAT Trigger 180151: Swift XRT source detection
  88. Possible GRB 060203: optical observations at Asiago
  89. GRB 060202: PROMPT Observations
  90. GRB 060202: GETS observation
  91. GRB 060202: Gemini-N J, H, K_s observations
  92. GRB 060202: Near-IR Observation with UKIRT/WFCAM
  93. GRB 060202: Optical Afterglow Candidate from Keck/LRIS
  94. GRB 060202: Refined analysis of the Swift-BAT burst
  95. GRB060202, optical observation
  96. GRB 060202: Swift/UVOT upper limits
  97. GRB 060202: Swift XRT Team Refined Analysis
  98. GRB 060202 : Lulin R and I band limit
  99. GRB060202: Faulkes North observation
  100. GRB 060121: Gemini Late-time Observations

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