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"

21915 results found.

  1. GRB 080409: REM optical/NIR observations
  2. GRB 080409: Swift detection of a burst
  3. GRB 080319A: Early RAPTOR optical limits
  4. GRB 080319B: HST observations
  5. GRB 080330: RAPTOR detection of prompt optical flash
  6. GRB 080405: Swift-BAT refined analysis
  7. GRB 080405: Swift-XRT position
  8. GRB 080405: Mars Oddysey and Swift-BAT detection, possible host galaxy
  9. GRB 080325: optical upper limit
  10. GRB 080328: GAO 150cm telescope Optical Observation
  11. GRB080330: Improved Swift XRT Position
  12. GRB080328, RIMOTS optical upper limit
  13. GRB 080330: REM optical observations
  14. GRB 080330 Swift-UVOT refined analysis
  15. GRB 080328: Suzaku WAM observation of the prompt emission
  16. GRB080330: TNT optical observations
  17. Konus-Wind observation of GRB 080328
  18. GRB 080330: GROND Observations
  19. GRB 080330: TAROT Calern observatory optical observations
  20. GRB 080330A: PAIRITEL Infrared Detections
  21. GRB 080330: error in reported XRT position
  22. GRB080330 - SDSS Pre-Burst Observations
  23. GRB 080330: Swift detection of a burst with an optical counterpart
  24. GRB 080330: TAROT Calern observatory optical detection
  25. Swift/UVOT observations of GRB080328
  26. GRB080319B, BVRcIc field calibration
  27. GRB 080328: Enhanced Swift-XRT position
  28. GRB 080328: Swift detection of a burst with an optical counterpart
  29. GRB 080325: Subaru detection of NIR afterglow candidate
  30. GRB 080325: GROND Observations
  31. GRB 080325: Swift/UVOT Upper Limits
  32. GRB 080325: Early observations from OSN
  33. GRB 080325: NIR afterglow candidate
  34. GRB 080319D: GROND Detection of the Optical Counterpart
  35. GRB 080325: Enhanced Swift-XRT position
  36. GRB 080325: Swift detection of a burst
  37. GRB 080319B: Spitzer Mid-infrared Observations
  38. GRB 080319C: Suzaku WAM observation of the prompt emission
  39. Radio Detection of GRB 080319B
  40. GRB 080320, Swift-BAT refined analysis
  41. GRB 080319D: GROND Observations
  42. GRB 080319B: TORTORA light curve
  43. GRB 080319B: optical upper limit
  44. GRB 080319D: optical upper limit
  45. GRB 080319C: UVOT Observations
  46. GRB 080319B: UVOT Observations
  47. GRB 080319A: UVOT Observations
  48. GRB 080320: Swift XRT refined analysis
  49. GRB 080320: Early Super-LOTIS Observations
  50. GRB 080320: J detection with FLAMINGOS
  51. GRB 080319D: Swift XRT refined analysis
  52. GRB 080320: optical limit
  53. GRB 080320: Gemini-N optical afterglow
  54. Konus-Wind observation of GRB 080319C
  55. GRB 080319B: Allen Telescope Array Observations
  56. Konus-Wind observation of GRB 080319B
  57. GRB 080320: Enhanced Swift-XRT position
  58. GRB 080320: optical limit from IAC80
  59. GRB 080319C: KAIT OA observations
  60. GRB 080320 - SDSS Pre-Burst Observations
  61. GRB 080320: Swift detection of a burst
  62. GRB 080320: ROTSE-III Optical Limits
  63. GRB 080319B: ROTSE-III Observations of Optical Counterpart
  64. GRB 080319C - SDSS Pre-Burst Observations
  65. GRB 080319A SDSS Pre-Burst Observations
  66. GRB080319B - SDSS Pre-Burst Observations
  67. GRB 080319C: Swift-XRT Team Refined Analysis
  68. GRB 080319B: Swift-XRT Team Refined Analysis
  69. GRB 080319D: Swift/UVOT Refined Analysis of the Fading Optical Afterglow Candidate
  70. GRB 080319C: AGILE-MCAL observation of the prompt emission
  71. GRB 080319D: MASTER-VWF-Kislovodsk optical observation
  72. GRB 080319C: MASTER-VWF-Kislovodsk optical observation
  73. GRB 080319D: Swift detection of a burst with a possible optical afterglow
  74. GRB 080319B: TORTORA synchronous observation
  75. GRB 080319B: Enhanced Swift-XRT position
  76. GRB 080319A: Enhanced Swift-XRT position
  77. GRB 080319A, Swift-BAT refined analysis
  78. GRB 080319B: REM early data
  79. GRB 080319C: Early Super-LOTIS Observations
  80. GRB 080319C: Swift detection of a burst with an optical afterglow
  81. GRB 080319A: REM observations
  82. GRB 080319B: Change in power law decay index
  83. GRB 080319A: optical observations at the NOT
  84. GRB 080319B: REM observations
  85. GRB080319A: P60 Optical Afterglow Observations
  86. GRB 080319B: Swift detection of an intense burst with a bright optical counterpart
  87. GRB 080319A: Swift detection of a burst
  88. GRB080315: Bok Optical Observations
  89. Swift/UVOT observations of GRB 080315
  90. Swift trigger 306323: Swift-BAT/XRT refined analysis
  91. GRB 080315: Optical observations
  92. GRB 080315: TAROT Calern observatory optical observations
  93. GRB 080315: Swift detection of a possible burst
  94. GRB 080310: GAO 150cm telescope Optical Observation
  95. GRB 080307: GAO 150cm telescope Optical Observation
  96. GRB 080229A: GAO 150cm telescope Optical Observation
  97. GRB 080310, Swift-BAT refined analysis
  98. GRB 080310: Swift/UVOT Refined Analysis
  99. GRB 080310 - SDSS Pre-Burst Observations
  100. GRB 080310: Enhanced Swift-XRT position

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