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"

36346 results found.

  1. GRB 080319C: KAIT OA candidate
  2. GRB 080319A: REM observations
  3. GRB 080319b prompt optical observation by Pi-of-the-Sky
  4. GRB 080319B: Change in power law decay index
  5. GRB 080319B: Gemini-South Spectroscopy
  6. GRB 080319A: optical observations at the NOT
  7. GRB0 080319B : LOAO optical observation
  8. GRB 080319b: Early IR Imaging from PAIRITEL
  9. GRB080319B Liverpool Telescope optical afterglow candidate
  10. GRB 080319B: Super-LOTIS Detection of a Bright OT
  11. GRB 080319B: REM observations
  12. GRB 080319B: KAIT OA
  13. GRB 080319B: UVOT Position
  14. GRB 080319B: Swift detection of an intense burst with a bright optical counterpart
  15. GRB 080319A: Swift detection of a burst
  16. Swift Trigger 306745 is not a GRB
  17. Swift Trigger 306616 is not a GRB
  18. GRB080310, LBT and MDM photometry
  19. GRB080315: Bok Optical Observations
  20. Swift/UVOT observations of GRB 080315
  21. Swift trigger 306323: Swift-BAT/XRT refined analysis
  22. GRB 080315: Optical observations
  23. GRB 080315: TAROT Calern observatory optical observations
  24. GRB 080315: Swift detection of a possible burst
  25. GRB080310 : Lulin Optical observations
  26. GRB080310, unusual slow decay in the optical
  27. GRB 080310: GAO 150cm telescope Optical Observation
  28. GRB 080310: ROTSE-III Observations of Optical Counterpart
  29. GRB080310: Optical observation by MITSuME telescope
  30. GRB080310, optical observations with the LBT
  31. GRB 080307: GAO 150cm telescope Optical Observation
  32. GRB 080229A: GAO 150cm telescope Optical Observation
  33. GRB 080310: PAIRITEL detection and PAIRITEL+KAIT+UVOT SED
  34. GRB 080307: NIR upper limit
  35. GRB 080229: NIR upper limit
  36. GRB 080310: early RAPTOR multicolor observations
  37. GRB 080310, Swift-BAT refined analysis
  38. GRB080210: optical observations
  39. GRB080307: optical upper limit
  40. GRB 080310: Swift-XRT refined analysis
  41. GRB 080310: Swift/UVOT Refined Analysis
  42. GRB 080310: Redshift from Keck/DEIMOS Spectra
  43. GRB 080310 - SDSS Pre-Burst Observations
  44. GRB 080310: Enhanced Swift-XRT position
  45. GRB 080310: RRM optical photometry with the VLT
  46. GRB080310, detection of break in optical
  47. GRB 080310: VLT/UVES spectroscopy
  48. GRB080310, optical observations with LBT
  49. GRB 080310: Magellan redshift revision
  50. GRB 080310: Lick/Kast Spectroscopy
  51. GRB080310: Super-LOTIS suggestion of brightening
  52. GRB 080310, SMARTS optical/IR afterglow observations
  53. GRB 080310: REM observations
  54. GRB 080310: Magellan redshift
  55. GRB 080310 afterglow candidate (correction to UT time)
  56. GRB 080310: Swift detection of a burst with optical afterglow
  57. GRB 080310 afterglow candidate
  58. GRB 080307: Swift-XRT Team refined analysis
  59. GRB 080307: Swift/UVOT Upper Limits
  60. GRB 080307: Early RAPTOR Limits
  61. GRB 080307, Swift-BAT refined analysis
  62. GRB080307 - SDSS Pre-Burst Observations
  63. GRB 080307: TNT optical observation
  64. GRB080307: Optical upper limits
  65. GRB 080307: Gemini-N i-band observations - candidate afterglow
  66. GRB 080307: BOAO imaging - retraction and new limit
  67. GRB 080307: retraction of UVOT candidate
  68. GRB 080307: Enhanced Swift-XRT position
  69. GRB 080307, Preliminary Swift-BAT refined analysis
  70. GRB 080307 : BOAO optical afterglow observation
  71. GRB 080307: Optical observation with DMC/KANATA
  72. GRB 080307: Swift detection of a burst
  73. VLA possible radio detection of GRB 080229
  74. GRB 080303: Swift/UVOT follow-up of afterglow detection
  75. GRB 080303, Swift-BAT refined analysis
  76. GRB 080303: Rapid PROMPT Detections
  77. GRB080303: Swift XRT refined analysis
  78. GRB 080303: Enhanced Swift-XRT position
  79. GRB080229B: Swift XRT afterglow observation
  80. GRB 080303A: Faulkes Telescope South optical afterglow observations
  81. GRB 080303
  82. GRB 080303: Swift detection of a burst with optical afterglow
  83. GRB 080303: REM NIR afterglow candidate
  84. GRB 080303A: ROTSE-III Optical Limits
  85. GRB 080229: I-band observations from OSN
  86. GRB 080229: VLT NIR observations
  87. GRB080229: Swift XRT refined analysis
  88. GRB 080229: TNG NIR observations
  89. GRB 080229: Deep Gemini/GMOS optical observations
  90. GRB 080229: Enhanced Swift-XRT position
  91. GRB 080229: REM NIR observations
  92. GRB080229: Possible optical afterglow
  93. GRB 080229B: Gamma Ray Burst Localization by SuperAGILE
  94. UVOT analysis for GRB080229
  95. GRB 080229, Swift-BAT refined analysis
  96. GRB 080229: Faulkes Telescope South optical limit
  97. GRB 080229A: ROTSE-III Optical Limits
  98. GRB 080229: Swift detection of a bright burst
  99. Early optical shallow decay in GRB 071112C
  100. GRB080207: 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