Skip to main content
Updates to LVK & CHIME Notices, Schema v7.2.3! See news and announcements

GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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"

28063 results found.

  1. GRB080330: Swift XRT refined analysis
  2. GRB 080330: REM optical observations
  3. GRB 080330, SMARTS optical/IR afterglow observations
  4. GRB080330: TNT optical observations
  5. GRB 080330: Redshift Confirmation from Hobby-Eberly Telescope Spectroscopy
  6. GRB080330: LOAO R-band Detection
  7. GRB 080330: GROND Observations
  8. GRB 080330: NOT redshift
  9. GRB 080330: TAROT Calern observatory optical observations
  10. GRB 080330A: PAIRITEL Infrared Detections
  11. GRB 080330: error in reported XRT position
  12. GRB 080330: Liverpool Telescope Optical observations
  13. GRB 080330A: ROTSE-III Detection of Optical Counterpart
  14. GRB 080330: Swift detection of a burst with an optical counterpart
  15. GRB 080330: TAROT Calern observatory optical detection
  16. GRB 080319B: Continued Gemini-South followup and possible host galaxy
  17. GRB 080328: BTA optical imaging and spectroscopy
  18. GRB 080328: Swift XRT refined analysis
  19. Swift/UVOT observations of GRB080328
  20. GRB080325 - I and z-band Imaging
  21. GRB 080328: Enhanced Swift-XRT position
  22. GRB080328: Faulkes Telescope North observations
  23. GRB 080328: Swift detection of a burst with an optical counterpart
  24. GRB 080325: Subaru detection of NIR afterglow candidate
  25. GRB080310, late-time photometry with LBT
  26. GRB 080325: MITSuME Akeno optical upper limits
  27. GRB080325: XRT Refined Analysis
  28. GRB 080325: GROND Observations
  29. GRB080319B: optical observations
  30. GRB 080325: Swift/UVOT Upper Limits
  31. GRB 080319C: Gemini-North spectroscopic redshift
  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 : Apparent spectral evolution in very early Swift/XRT WT mode data: intrinsic or pile-up effect?
  38. GRB 080319B: Spitzer Mid-infrared Observations
  39. GRB 080319B: Second & Third Epoch WSRT Radio Observations
  40. Radio Detection of GRB 080319B
  41. GRB 080319B: Optical observation (Brno, CZ)
  42. GRB 080319D: GROND Observations
  43. GRB 080319B: optical upper limit
  44. GRB 080319D: optical upper limit
  45. GRB080319B: Time-Independent XRT Spectrum
  46. GRB 080319C: UVOT Observations
  47. GRB 080319B: UVOT Observations
  48. GRB 080319A: UVOT Observations
  49. GRB 080320: Swift XRT refined analysis
  50. GRB 080319B - CARMA mm Observations
  51. GRB 080320: Early Super-LOTIS Observations
  52. GRB 080320: J detection with FLAMINGOS
  53. GRB 080319D: Swift XRT refined analysis
  54. GRB 080320: optical limit
  55. GRB 080320: Gemini-N optical afterglow
  56. GRB 080319B: Gemini-South photometry
  57. GRB 080319B: Allen Telescope Array Observations
  58. GRB 080319B optical observations
  59. GRB 080319B: WSRT Radio Observations
  60. GRB 080320: SDSS source and Gemini-N observations
  61. GRB 080320: Enhanced Swift-XRT position
  62. GRB 080320: optical limit from IAC80
  63. GRB 080319C: KAIT OA observations
  64. GRB 080320: Swift detection of a burst
  65. GRB 080320: ROTSE-III Optical Limits
  66. GRB 080319B : Lulin observation of temporal break at 0.2 days
  67. GRB 080319B: RAPTOR observations of a naked eye burst
  68. GRB 080319A: Swift-XRT Team Refined Analysis
  69. GRB080319B: Prompt PROMPT Detections
  70. GRB 080319C: Swift-XRT Team Refined Analysis
  71. GRB 080319B: Swift-XRT Team Refined Analysis
  72. GRB 080319D: Swift/UVOT Refined Analysis of the Fading Optical Afterglow Candidate
  73. GRB 080319C: AGILE-MCAL observation of the prompt emission
  74. GRB 080319B: Hobby-Eberly Telescope Spectroscopy
  75. GRB 080319D: Swift detection of a burst with a possible optical afterglow
  76. GRB 080319B: TORTORA synchronous observation
  77. VLT/UVES redshift of GRB 080319B from FeII fine-structure lines
  78. GRB 080319B: Enhanced Swift-XRT position
  79. GRB 080319A: Enhanced Swift-XRT position
  80. VLT/UVES redshift of GRB 080319B
  81. GRB 080319C: Early Super-LOTIS Observations
  82. GRB 080319C: Swift detection of a burst with an optical afterglow
  83. GRB 080319C: KAIT OA candidate
  84. GRB 080319A: REM observations
  85. GRB 080319b prompt optical observation by Pi-of-the-Sky
  86. GRB 080319B: Gemini-South Spectroscopy
  87. GRB 080319A: optical observations at the NOT
  88. GRB0 080319B : LOAO optical observation
  89. GRB080319B Liverpool Telescope optical afterglow candidate
  90. GRB 080319B: Super-LOTIS Detection of a Bright OT
  91. GRB 080319B: REM observations
  92. GRB 080319B: KAIT OA
  93. GRB080319A: P60 Optical Afterglow Observations
  94. GRB 080319B: Swift detection of an intense burst with a bright optical counterpart
  95. GRB 080319A: Swift detection of a burst
  96. GRB080310, LBT and MDM photometry
  97. GRB080315: Bok Optical Observations
  98. Swift/UVOT observations of GRB 080315
  99. Swift trigger 306323: Swift-BAT/XRT refined analysis
  100. SAX J1818.6-1703: Swift detection (trigger 306379)

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