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"

28230 results found.

  1. GRB 060512: Subaru NIR observation
  2. GRB060512: Swift XRT Team refined analysis
  3. GRB 060512: 1.54m Kuiper Observations
  4. GRB 060512: Detection of NIR afterglow
  5. GRB 060512: P60 Observations
  6. GRB 060512: Swift-BAT Refined Analysis
  7. GRB 060512: REM NIR observations
  8. GRB060512 - SDSS Pre-Burst Observations
  9. GRB 060512: Swift detection of a burst with an optical afterglow
  10. GRB 060505: X-ray afterglow - Correction -
  11. GRB 060505: X-ray afterglow
  12. Konus-Wind observation of GRB 060510A
  13. GRB060418: optical observations
  14. GRB 060428a, SMARTS optical/IR afterglow detection
  15. GRB060510B: Swift XRT refined analysis
  16. GRB 060510A: Refined analysis of the Swift-BAT burst
  17. GRB 060510B: Swift-BAT Refined Analysis
  18. GRB060510A: XRT refined analysis
  19. GRB060510 - SDSS Pre-Burst Observations
  20. GRB 060510B: Swift detection of a burst
  21. GRB 060510: Swift detection of a burst with optical transient
  22. GRB060507: optical afterglow detection
  23. GRB060502B: improvement in the XRT afterglow position
  24. GRB 060507: Final Refined analysis of the Swift-BAT burst
  25. GRB 060507: Swift-BAT Refined Analysis
  26. GRB 060505: PROMPT Observations
  27. GRB 060507: Swift XRT Team Refined Analysis
  28. GRB 060507: Swift detection of a burst
  29. GRB 060429: Suzaku WAM observation
  30. GRB060505: Swift/UVOT Observations
  31. GRB060425: new MASTER survey method
  32. GRB 060306: Further Analysis of SOAR and APO NIR Observations
  33. GRB 060505: Swift XRT afterglow canditate position
  34. GRB 060502b: Second epoch Gemini observations
  35. GRB 060505: Swift-BAT detection of a weak burst
  36. GRB 060428B: spectroscopy
  37. GRB 060502B: optical observations
  38. GRB 060502B: AROMA refined photometric calibration
  39. GRB 060502B MDM Follow-up Observation
  40. GRB 060502b: Gemini imaging and spectroscopy
  41. GRB060502A, optical observation
  42. GRB 060502B: Swift/UVOT upper limits
  43. GRB 060502A: Swift/UVOT source detection
  44. GRB 060502B: MDM Optical Observation
  45. GRB 060502B: Refined analysis of the Swift-BAT short burst
  46. GRB060502B: Swift XRT Team refined analysis
  47. GRB 060501: P60 Observations and Candidate Retraction
  48. GRB 060502B: Xinglong optical observation
  49. GRB060502: Swift-XRT refined analysis
  50. GRB 060502: Swift-BAT refined analysis
  51. GRB060501: Swift UVOT followup observations
  52. GRB 060502: P60 Afterglow Confirmation
  53. GRB 060502: Swift detection of a burst with an optical counterpart
  54. GRB060501: P60 imaging and afterglow candidate
  55. GRB 060501: Refined analysis of the Swift-BAT burst
  56. GRB060428B - SDSS Pre-Burst Observations
  57. GRB060428B: possible detection of an optical counterpart by Swift/UVOT.
  58. GRB 060428B: MDM Observations
  59. GRB060428B: Swift XRT Team refined analysis
  60. GRB 060427B: IPN localization of a short hard burst
  61. GRB 060428B: Refined analysis of the Swift-BAT burst
  62. GRB 060428B: Xinglong I-band limit
  63. GRB 051117A: Bright host galaxy not confirmed
  64. GRB060428A: Swift/UVOT observations.
  65. GRB060428B, optical observation
  66. GRB 060428A: Refined analysis of the Swift-BAT burst
  67. GRB 060428b : Kiso R-band limit
  68. GRB 060428b: Optical afterglow candidate
  69. GRB060428A: Swift XRT Team refined analysis
  70. GRB 060428B: Swift detection of a burst
  71. GRB 060427: NIR observations
  72. GRB060427: Xinglong optical Observations
  73. GRB 060428: Swift detection of a burst
  74. GRB 060427: Swift/UVOT upper limits.
  75. GRB 060427: Refined analysis of the Swift-BAT burst
  76. GRB060427: Swift XRT Team refined analysis
  77. GRB060418: Swift XRT Team Further Refined Analysis
  78. GRB060425:MASTER survey observations
  79. GRB 060427, optical observation
  80. GRB 060427: Swift detection of a burst
  81. GRB060418: Further Analysis of MIKE Spectroscopy
  82. GRB 060424: Refined analysis of the Swift-BAT burst
  83. GRB 060421: TTT Observations
  84. GRB060421: Swift/UVOT observations
  85. GRB 060421: Swift-BAT Refined Analysis
  86. GRB 060421: Swift-XRT refined analysis
  87. GRB 060418: prediction of t_break
  88. GRB(?) 060421: Swift detection of a burst
  89. Erratum of GCN 4983 for GRB 060418 IR follow-up
  90. GRB 060418 : IR afterglow observations
  91. GRB 060418: Radio Observations
  92. GRB060418, BVRcIc field calibration
  93. GRB060418: Swift/UVOT Observations
  94. GRB060418: Optical Observations
  95. GRB 060418: Refined Analysis of the Swift-BAT burst
  96. GRB 060418, SMARTS continuing afterglow observations
  97. GRB 060418, SMARTS optical/IR afterglow observations
  98. GRB060418 : LT optical afterglow observation
  99. GRB 060418: REM candidate afterglow
  100. GRB 060418: Swift detection of a burst with bright x-ray and optical afterglow

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