Skip to main content
Due to the lapse in federal government funding, NASA is not updating this website. See the Operations FAQ for GCN impacts.
New! Super-Kamiokande JSON Notices and Schema v4.5.0. 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"
  1. GRB 080319C: Suzaku WAM observation of the prompt emission
  2. GRB 080319B: Second & Third Epoch WSRT Radio Observations
  3. Radio Detection of GRB 080319B
  4. GRB 080320, Swift-BAT refined analysis
  5. GRB 080319B: Optical observation (Brno, CZ)
  6. GRB 080319D: GROND Observations
  7. GRB 080319B: TORTORA light curve
  8. GRB 080319B: optical upper limit
  9. GRB 080319D: optical upper limit
  10. GRB080319B: Time-Independent XRT Spectrum
  11. GRB 080319D, Swift-BAT refined analysis
  12. GRB 080319C: UVOT Observations
  13. GRB 080319B: UVOT Observations
  14. GRB 080319A: UVOT Observations
  15. GRB 080320: Swift XRT refined analysis
  16. GRB 080319B - CARMA mm Observations
  17. GRB 080320: Early Super-LOTIS Observations
  18. GRB 080320: J detection with FLAMINGOS
  19. GRB 080319D: Swift XRT refined analysis
  20. GRB 080320: optical limit
  21. GRB 080320: Gemini-N optical afterglow
  22. Konus-Wind observation of GRB 080319C
  23. GRB 080319B: Gemini-South photometry
  24. GRB 080319B: Allen Telescope Array Observations
  25. GRB 080319B optical observations
  26. GRB 080319C, Swift-BAT refined analysis
  27. Konus-Wind observation of GRB 080319B
  28. GRB 080319B: WSRT Radio Observations
  29. GRB 080320: SDSS source and Gemini-N observations
  30. GRB 080320: Enhanced Swift-XRT position
  31. GRB 080320: optical limit from IAC80
  32. GRB 080319C: Early RAPTOR Observations
  33. GRB 080319B: second epoch imaging from Canarias (correction to GCN7469)
  34. GRB 080319C: KAIT OA observations
  35. GRB 080320 - SDSS Pre-Burst Observations
  36. GRB 080320: Swift detection of a burst
  37. GRB 080320: ROTSE-III Optical Limits
  38. GRB 080319B : Lulin observation of temporal break at 0.2 days
  39. GRB 080319B: ROTSE-III Observations of Optical Counterpart
  40. GRB 080319B: optical observations
  41. GRB 080319C - SDSS Pre-Burst Observations
  42. GRB 080319A SDSS Pre-Burst Observations
  43. Swift-BAT trigger 306829 is IGR J16479-4514
  44. GRB080319B - SDSS Pre-Burst Observations
  45. GRB 080319B: RAPTOR observations of a naked eye burst
  46. GRB 080319A: Swift-XRT Team Refined Analysis
  47. GRB 080319B, Swift-BAT refined analysis
  48. GRB080319B: Prompt PROMPT Detections
  49. GRB 080319C: Swift-XRT Team Refined Analysis
  50. GRB 080319B: Swift-XRT Team Refined Analysis
  51. GRB 080319D: Swift/UVOT Refined Analysis of the Fading Optical Afterglow Candidate
  52. GRB 080319C: AGILE-MCAL observation of the prompt emission
  53. GRB 080319B: Hobby-Eberly Telescope Spectroscopy
  54. GRB 080319D: MASTER-VWF-Kislovodsk optical observation
  55. GRB 080319C: MASTER-VWF-Kislovodsk optical observation
  56. GRB 080319D: Swift detection of a burst with a possible optical afterglow
  57. GRB 080319B: TORTORA synchronous observation
  58. VLT/UVES redshift of GRB 080319B from FeII fine-structure lines
  59. GRB 080319A/B/C: INTEGRAL SPI-ACS light curves available
  60. GRB 080319B: Enhanced Swift-XRT position
  61. GRB 080319A: Enhanced Swift-XRT position
  62. GRB 080319A, Swift-BAT refined analysis
  63. GRB 080319B: REM early data
  64. GRB 080319b light curve by Pi-of-the-Sky
  65. VLT/UVES redshift of GRB 080319B
  66. GRB 080319C: Early Super-LOTIS Observations
  67. GRB 080319C: Swift detection of a burst with an optical afterglow
  68. GRB 080319C: KAIT OA candidate
  69. GRB 080319A: REM observations
  70. GRB 080319b prompt optical observation by Pi-of-the-Sky
  71. GRB 080319B: Change in power law decay index
  72. GRB 080319B: Gemini-South Spectroscopy
  73. GRB 080319A: optical observations at the NOT
  74. GRB0 080319B : LOAO optical observation
  75. GRB 080319b: Early IR Imaging from PAIRITEL
  76. GRB080319B Liverpool Telescope optical afterglow candidate
  77. GRB 080319B: Super-LOTIS Detection of a Bright OT
  78. GRB 080319B: REM observations
  79. GRB 080319B: KAIT OA
  80. GRB080319A: P60 Optical Afterglow Observations
  81. GRB 080319B: UVOT Position
  82. GRB 080319B: Swift detection of an intense burst with a bright optical counterpart
  83. GRB 080319A: Swift detection of a burst
  84. Swift Trigger 306745 is not a GRB
  85. Swift Trigger 306616 is not a GRB
  86. GRB080310, LBT and MDM photometry
  87. GRB080315: Bok Optical Observations
  88. Swift/UVOT observations of GRB 080315
  89. Swift trigger 306323: Swift-BAT/XRT refined analysis
  90. SAX J1818.6-1703: Swift detection (trigger 306379)
  91. GRB 080315: Optical observations
  92. GRB 080315: TAROT Calern observatory optical observations
  93. GRB 080315: Swift detection of a possible burst
  94. GRB080310 : Lulin Optical observations
  95. GRB080310, unusual slow decay in the optical
  96. GRB 080310: GAO 150cm telescope Optical Observation
  97. GRB080310 : Optical observations by LOAO and Lulin
  98. GRB 080310: ROTSE-III Observations of Optical Counterpart
  99. GRB080310: Optical observation by MITSuME telescope
  100. GRB080310, optical observations with the LBT

Advanced

Download all Circulars as a .tar.gz archive:
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