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"
  1. GRB 060505: PROMPT Observations
  2. GRB 060507: Swift/UVOT Upper Limits
  3. GRB 060507: Swift XRT Team Refined Analysis
  4. GRB 060507: MDM Optical Upper Limit
  5. GRB060507: Swift XRT position
  6. GRB 060507: Swift detection of a burst
  7. GRB 060429: Suzaku WAM observation
  8. GRB060505: Swift/UVOT Observations
  9. GRB 060505: Swift XRT Team Refined Analysis
  10. GRB060425: new MASTER survey method
  11. GRB 060306: Further Analysis of SOAR and APO NIR Observations
  12. GRB 060505: Swift XRT afterglow canditate position
  13. GRB 060502b: Second epoch Gemini observations
  14. GRB 060505: Swift-BAT detection of a weak burst
  15. GRB 060428B: spectroscopy
  16. GRB 060502B: optical observations
  17. GRB 060502B: AROMA refined photometric calibration
  18. GRB 060502B MDM Follow-up Observation
  19. GRB 060502b: Gemini imaging and spectroscopy
  20. GRB060502A, optical observation
  21. GRB 060502B: Swift/UVOT upper limits
  22. GRB 060502A: Swift/UVOT source detection
  23. GRB 060429: Refined IPN error box and Konus-Wind spectrum
  24. GRB 060502B: MDM Optical Observation
  25. GRB 060502B: AROMA optical observations
  26. GRB 060502B: Refined analysis of the Swift-BAT short burst
  27. GRB060502B: Swift XRT Team refined analysis
  28. Short GRB 060502B: Tautenburg Observation
  29. GRB 060427B Milagro GeV/TeV Observations
  30. GRB 060502A: TTT Observations
  31. GRB060502B: correction to XRT position
  32. GRB 060501: P60 Observations and Candidate Retraction
  33. GRB 060502B: Xinglong optical observation
  34. GRB 060502B: MASTER optical observations
  35. GRB 060502B: Swift detection of a short burst
  36. GRB060502: Swift-XRT refined analysis
  37. GRB 060502: Swift-BAT refined analysis
  38. GRB060502: Gemini spectroscopy
  39. GRB 060502: APO Spectroscopic Observations
  40. GRB060501: Swift UVOT followup observations
  41. GRB060502: Super-LOTIS Observations
  42. GRB 060502: P60 Afterglow Confirmation
  43. GRB 060502: Swift detection of a burst with an optical counterpart
  44. GRB 060501: MDM Observations
  45. GRB060501: Super-LOTIS observations
  46. GRB060501: P60 imaging and afterglow candidate
  47. GRB 060501: Refined analysis of the Swift-BAT burst
  48. GRB060501: Swift XRT position
  49. GRB 060501: ROTSE-III Optical Limits
  50. GRB 060501: Swift detection of a burst
  51. IPN triangulation of GRB060429 (short/hard)
  52. Konus-Wind observation of GRB 060427B
  53. GRB060428B - SDSS Pre-Burst Observations
  54. GRB060428B: optical observation
  55. GRB060428B: possible detection of an optical counterpart by Swift/UVOT.
  56. GRB 060428B: MDM Observations
  57. GRB 060428A: PROMPT Observations
  58. GRB 060427B: MASTER optical 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 060428B: KAIT observations
  64. GRB060425:MASTER optical limit
  65. GRB 051117A: Bright host galaxy not confirmed
  66. GRB060428A: Swift/UVOT observations.
  67. GRB060428B, optical observation
  68. GRB 060428A: Refined analysis of the Swift-BAT burst
  69. GRB 060428b : Kiso R-band limit
  70. GRB060427:MASTER optical 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: NOT observations
  78. GRB 060427: Swift/UVOT upper limits.
  79. GRB 060427: Refined analysis of the Swift-BAT burst
  80. GRB060427: Swift XRT Team refined analysis
  81. GRB060418: Swift XRT Team Further Refined Analysis
  82. GRB060425:MASTER survey observations
  83. GRB 060427, optical observation
  84. GRB 060427: Swift detection of a burst
  85. GRB 060425: IPN localization and KW spectrum of a short, hard burst
  86. An interactive program for GRB pseudo-redshift computations
  87. GRB060424: optical afterglow detection
  88. GRB060418: Further Analysis of MIKE Spectroscopy
  89. GRB 060424: Refined analysis of the Swift-BAT burst
  90. GRB 060424: Swift detection of a burst
  91. GRB 060421: TTT Observations
  92. OT 060420: Likely Not a New Cosmic Transient
  93. No OT 060420 in MASCOT images
  94. Swift-BAT detection of Mrk 421
  95. OT 060420: CONCAM detection of a candidate new magnitude 5 optical
  96. GRB060421: Swift/UVOT observations
  97. GRB 060421: Swift-BAT Refined Analysis
  98. GRB 060421: Swift-XRT refined analysis
  99. GRB 060418: prediction of t_break
  100. GRB060418: optical 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