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"

42270 results found.

  1. GRB 060515: Swift/UVOT Upper Limits
  2. GRB 060515: Swift/XRT position
  3. GRB 060515: Super-LOTIS Observations
  4. GRB060515: Swift/UVOT initial observation
  5. GRB 060515: TAROT optical observation
  6. GRB 060515: ROTSE-III Optical Limits
  7. GRB 060515: Swift detection of a burst
  8. VLT optical spectroscopy of GRB 060512
  9. Swift/UVOT observations of GRB060512.
  10. GRB 060512: Subaru NIR observation
  11. GRB060512: Swift XRT Team refined analysis
  12. GRB 060512: 1.54m Kuiper Observations
  13. GRB 060512: P60 Observations
  14. GRB 060512: Swift-BAT Refined Analysis
  15. GRB 060505 - OT candidate + galaxy spectrum
  16. GRB 060512: optical decay
  17. GRB 060512: REM NIR observations
  18. GRB060512 - SDSS Pre-Burst Observations
  19. GRB060512 Name Correction: LT Afterglow detection
  20. GRB060512: Liverpool Telescope Afterglow detection
  21. GRB 060512: Swift detection of a burst with an optical afterglow
  22. GRB 060510A: Swift/UVOT Detection of an Optical Afterglow
  23. GRB 060505: X-ray afterglow - Correction -
  24. GRB 060505: X-ray afterglow
  25. Konus-Wind observation of GRB 060510A
  26. GRB060418: optical observations
  27. GRB 060428a, SMARTS optical/IR afterglow detection
  28. GRB060510B: Swift XRT refined analysis
  29. GRB 060510B: Swift/UVOT Upper Limits
  30. GRB 060510A: Refined analysis of the Swift-BAT burst
  31. GRB 060510B: Swift-BAT Refined Analysis
  32. GRB060510A: XRT refined analysis
  33. GRB060510 - SDSS Pre-Burst Observations
  34. GRB 060510b: Redshift
  35. GRB060510B : Faulkes North Telescope detection
  36. GRB 060510B : Planned XMM-Newton observation
  37. GRB 060510b: Gemini NIR observations
  38. GRB 060510b: NIR observations
  39. GRB 060510B: MDM Observations and candidate OT
  40. GRB 060510B: Swift detection of a burst
  41. GRB 060510: Swift detection of a burst with optical transient
  42. GRB060507: optical afterglow detection
  43. GRB060502B: improvement in the XRT afterglow position
  44. GRB 060507: Swift-BAT Refined Analysis
  45. GRB 060505: PROMPT Observations
  46. GRB 060507: Swift/UVOT Upper Limits
  47. GRB 060507: Swift XRT Team Refined Analysis
  48. GRB 060507: MDM Optical Upper Limit
  49. GRB060507: Swift XRT position
  50. GRB 060507: Swift detection of a burst
  51. GRB 060429: Suzaku WAM observation
  52. GRB060505: Swift/UVOT Observations
  53. GRB 060505: Swift XRT Team Refined Analysis
  54. GRB060425: new MASTER survey method
  55. GRB 060306: Further Analysis of SOAR and APO NIR Observations
  56. GRB 060505: Swift XRT afterglow canditate position
  57. GRB 060502b: Second epoch Gemini observations
  58. GRB 060428B: spectroscopy
  59. GRB 060502B: optical observations
  60. GRB 060502B: AROMA refined photometric calibration
  61. GRB 060502b: Gemini imaging and spectroscopy
  62. GRB060502A, optical observation
  63. GRB 060502B: Swift/UVOT upper limits
  64. GRB 060502A: Swift/UVOT source detection
  65. GRB 060429: Refined IPN error box and Konus-Wind spectrum
  66. GRB 060502B: MDM Optical Observation
  67. GRB 060502B: AROMA optical observations
  68. GRB 060502B: Refined analysis of the Swift-BAT short burst
  69. GRB060502B: Swift XRT Team refined analysis
  70. Short GRB 060502B: Tautenburg Observation
  71. GRB 060427B Milagro GeV/TeV Observations
  72. GRB060502B: correction to XRT position
  73. GRB 060501: P60 Observations and Candidate Retraction
  74. GRB 060502B: Xinglong optical observation
  75. GRB 060502B: MASTER optical observations
  76. GRB 060502B: Swift detection of a short burst
  77. GRB060502: Swift-XRT refined analysis
  78. GRB060502: Gemini spectroscopy
  79. GRB 060502: APO Spectroscopic Observations
  80. GRB060501: Swift UVOT followup observations
  81. GRB 060502: P60 Afterglow Confirmation
  82. GRB 060502: Swift detection of a burst with an optical counterpart
  83. GRB060501: Super-LOTIS observations
  84. GRB060501: P60 imaging and afterglow candidate
  85. GRB 060501: Refined analysis of the Swift-BAT burst
  86. GRB060501: Swift XRT position
  87. GRB 060501: ROTSE-III Optical Limits
  88. GRB 060501: Swift detection of a burst
  89. Konus-Wind observation of GRB 060427B
  90. GRB060428B - SDSS Pre-Burst Observations
  91. GRB060428B: optical observation
  92. GRB060428B: possible detection of an optical counterpart by Swift/UVOT.
  93. GRB 060428B: MDM Observations
  94. GRB 060428A: PROMPT Observations
  95. GRB 060427B: MASTER optical observations
  96. GRB060428B: Swift XRT Team refined analysis
  97. GRB 060427B: IPN localization of a short hard burst
  98. GRB 060428B: Refined analysis of the Swift-BAT burst
  99. GRB 060428B: Xinglong I-band limit
  100. GRB 060428B: KAIT 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