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"

28233 results found.

  1. GRB 060515: Swift/XRT position
  2. GRB 060515: Super-LOTIS Observations
  3. GRB 060515: TAROT optical observation
  4. GRB 060512: Subaru NIR observation
  5. GRB060512: Swift XRT Team refined analysis
  6. GRB 060512: 1.54m Kuiper Observations
  7. GRB 060512: Detection of NIR afterglow
  8. GRB 060512: P60 Observations
  9. GRB 060512: Swift-BAT Refined Analysis
  10. GRB 060512: REM NIR observations
  11. GRB060512 - SDSS Pre-Burst Observations
  12. GRB 060512: Swift detection of a burst with an optical afterglow
  13. GRB 060505: X-ray afterglow - Correction -
  14. GRB 060505: X-ray afterglow
  15. Konus-Wind observation of GRB 060510A
  16. GRB060418: optical observations
  17. GRB 060428a, SMARTS optical/IR afterglow detection
  18. GRB060510B: Swift XRT refined analysis
  19. GRB 060510A: Refined analysis of the Swift-BAT burst
  20. GRB 060510B: Swift-BAT Refined Analysis
  21. GRB060510A: XRT refined analysis
  22. GRB060510 - SDSS Pre-Burst Observations
  23. GRB 060510B: Swift detection of a burst
  24. GRB 060510: Swift detection of a burst with optical transient
  25. GRB060507: optical afterglow detection
  26. GRB060502B: improvement in the XRT afterglow position
  27. GRB 060507: Final Refined analysis of the Swift-BAT burst
  28. GRB 060507: Swift-BAT Refined Analysis
  29. GRB 060505: PROMPT Observations
  30. GRB 060507: Swift XRT Team Refined Analysis
  31. GRB 060507: Swift detection of a burst
  32. GRB 060429: Suzaku WAM observation
  33. GRB060505: Swift/UVOT Observations
  34. GRB060425: new MASTER survey method
  35. GRB 060306: Further Analysis of SOAR and APO NIR Observations
  36. GRB 060505: Swift XRT afterglow canditate position
  37. GRB 060502b: Second epoch Gemini observations
  38. GRB 060505: Swift-BAT detection of a weak burst
  39. GRB 060428B: spectroscopy
  40. GRB 060502B: optical observations
  41. GRB 060502B: AROMA refined photometric calibration
  42. GRB 060502B MDM Follow-up Observation
  43. GRB 060502b: Gemini imaging and spectroscopy
  44. GRB060502A, optical observation
  45. GRB 060502B: Swift/UVOT upper limits
  46. GRB 060502A: Swift/UVOT source detection
  47. GRB 060502B: MDM Optical Observation
  48. GRB 060502B: Refined analysis of the Swift-BAT short burst
  49. GRB060502B: Swift XRT Team refined analysis
  50. GRB 060501: P60 Observations and Candidate Retraction
  51. GRB 060502B: Xinglong optical observation
  52. GRB060502: Swift-XRT refined analysis
  53. GRB 060502: Swift-BAT refined analysis
  54. GRB060501: Swift UVOT followup observations
  55. GRB 060502: P60 Afterglow Confirmation
  56. GRB 060502: Swift detection of a burst with an optical counterpart
  57. GRB060501: P60 imaging and afterglow candidate
  58. GRB 060501: Refined analysis of the Swift-BAT burst
  59. GRB060428B - SDSS Pre-Burst Observations
  60. GRB060428B: possible detection of an optical counterpart by Swift/UVOT.
  61. GRB 060428B: MDM Observations
  62. GRB060428B: Swift XRT Team refined analysis
  63. GRB 060427B: IPN localization of a short hard burst
  64. GRB 060428B: Refined analysis of the Swift-BAT burst
  65. GRB 060428B: Xinglong I-band limit
  66. GRB 051117A: Bright host galaxy not confirmed
  67. GRB060428A: Swift/UVOT observations.
  68. GRB060428B, optical observation
  69. GRB 060428A: Refined analysis of the Swift-BAT burst
  70. GRB 060428b : Kiso R-band limit
  71. GRB 060428b: Optical afterglow candidate
  72. GRB060428A: Swift XRT Team refined analysis
  73. GRB 060428B: Swift detection of a burst
  74. GRB 060427: NIR observations
  75. GRB060427: Xinglong optical Observations
  76. GRB 060428: Swift detection of a burst
  77. GRB 060427: Swift/UVOT upper limits.
  78. GRB 060427: Refined analysis of the Swift-BAT burst
  79. GRB060427: Swift XRT Team refined analysis
  80. GRB060418: Swift XRT Team Further Refined Analysis
  81. GRB060425:MASTER survey observations
  82. GRB 060427, optical observation
  83. GRB 060427: Swift detection of a burst
  84. GRB060418: Further Analysis of MIKE Spectroscopy
  85. GRB 060424: Refined analysis of the Swift-BAT burst
  86. GRB 060421: TTT Observations
  87. GRB060421: Swift/UVOT observations
  88. GRB 060421: Swift-BAT Refined Analysis
  89. GRB 060421: Swift-XRT refined analysis
  90. GRB 060418: prediction of t_break
  91. GRB(?) 060421: Swift detection of a burst
  92. Erratum of GCN 4983 for GRB 060418 IR follow-up
  93. GRB 060418 : IR afterglow observations
  94. GRB 060418: Radio Observations
  95. GRB060418, BVRcIc field calibration
  96. GRB060418: Swift/UVOT Observations
  97. GRB060418: Optical Observations
  98. GRB 060418: Refined Analysis of the Swift-BAT burst
  99. GRB 060418, SMARTS continuing afterglow observations
  100. GRB 060418, SMARTS optical/IR afterglow 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