Skip to main content
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 080319B: optical observations
  2. GRB 080319C - SDSS Pre-Burst Observations
  3. GRB 080319A SDSS Pre-Burst Observations
  4. Swift-BAT trigger 306829 is IGR J16479-4514
  5. GRB080319B - SDSS Pre-Burst Observations
  6. GRB 080319B: RAPTOR observations of a naked eye burst
  7. GRB 080319A: Swift-XRT Team Refined Analysis
  8. GRB 080319B, Swift-BAT refined analysis
  9. GRB080319B: Prompt PROMPT Detections
  10. GRB 080319C: Swift-XRT Team Refined Analysis
  11. GRB 080319B: Swift-XRT Team Refined Analysis
  12. GRB 080319D: Swift/UVOT Refined Analysis of the Fading Optical Afterglow Candidate
  13. GRB 080319C: AGILE-MCAL observation of the prompt emission
  14. GRB 080319B: Hobby-Eberly Telescope Spectroscopy
  15. GRB 080319D: MASTER-VWF-Kislovodsk optical observation
  16. GRB 080319C: MASTER-VWF-Kislovodsk optical observation
  17. GRB 080319D: Swift detection of a burst with a possible optical afterglow
  18. GRB 080319B: TORTORA synchronous observation
  19. VLT/UVES redshift of GRB 080319B from FeII fine-structure lines
  20. GRB 080319A/B/C: INTEGRAL SPI-ACS light curves available
  21. GRB 080319B: Enhanced Swift-XRT position
  22. GRB 080319A: Enhanced Swift-XRT position
  23. GRB 080319A, Swift-BAT refined analysis
  24. GRB 080319B: REM early data
  25. GRB 080319b light curve by Pi-of-the-Sky
  26. VLT/UVES redshift of GRB 080319B
  27. GRB 080319C: Early Super-LOTIS Observations
  28. GRB 080319C: Swift detection of a burst with an optical afterglow
  29. GRB 080319C: KAIT OA candidate
  30. GRB 080319A: REM observations
  31. GRB 080319b prompt optical observation by Pi-of-the-Sky
  32. GRB 080319B: Change in power law decay index
  33. GRB 080319B: Gemini-South Spectroscopy
  34. GRB 080319A: optical observations at the NOT
  35. GRB0 080319B : LOAO optical observation
  36. GRB 080319b: Early IR Imaging from PAIRITEL
  37. GRB080319B Liverpool Telescope optical afterglow candidate
  38. GRB 080319B: Super-LOTIS Detection of a Bright OT
  39. GRB 080319B: REM observations
  40. GRB 080319B: KAIT OA
  41. GRB080319A: P60 Optical Afterglow Observations
  42. GRB 080319B: UVOT Position
  43. GRB 080319B: Swift detection of an intense burst with a bright optical counterpart
  44. GRB 080319A: Swift detection of a burst
  45. Swift Trigger 306745 is not a GRB
  46. Swift Trigger 306616 is not a GRB
  47. GRB080310, LBT and MDM photometry
  48. GRB080315: Bok Optical Observations
  49. Swift/UVOT observations of GRB 080315
  50. Swift trigger 306323: Swift-BAT/XRT refined analysis
  51. SAX J1818.6-1703: Swift detection (trigger 306379)
  52. GRB 080315: Optical observations
  53. GRB 080315: TAROT Calern observatory optical observations
  54. GRB 080315: Swift detection of a possible burst
  55. GRB080310 : Lulin Optical observations
  56. GRB080310, unusual slow decay in the optical
  57. GRB 080310: GAO 150cm telescope Optical Observation
  58. GRB080310 : Optical observations by LOAO and Lulin
  59. GRB 080310: ROTSE-III Observations of Optical Counterpart
  60. GRB080310: Optical observation by MITSuME telescope
  61. GRB080310, optical observations with the LBT
  62. GRB 080307: GAO 150cm telescope Optical Observation
  63. GRB 080229A: GAO 150cm telescope Optical Observation
  64. GRB 080310: PAIRITEL detection and PAIRITEL+KAIT+UVOT SED
  65. GRB 080307: NIR upper limit
  66. GRB 080229: NIR upper limit
  67. GRB 080310: early RAPTOR multicolor observations
  68. GRB 080310, Swift-BAT refined analysis
  69. GRB080210: optical observations
  70. GRB080307: optical upper limit
  71. GRB 080310: Swift-XRT refined analysis
  72. GRB 080310: Swift/UVOT Refined Analysis
  73. GRB 080310: Redshift from Keck/DEIMOS Spectra
  74. GRB 080310 - SDSS Pre-Burst Observations
  75. GRB080310 : Lulin optical observation
  76. GRB 080310: Enhanced Swift-XRT position
  77. GRB 080310: RRM optical photometry with the VLT
  78. GRB080310, detection of break in optical
  79. GRB 080310: VLT/UVES spectroscopy
  80. GRB080310, optical observations with LBT
  81. GRB 080310: Magellan redshift revision
  82. GRB 080310: Lick/Kast Spectroscopy
  83. GRB080310: Super-LOTIS suggestion of brightening
  84. GRB 080310, SMARTS optical/IR afterglow observations
  85. GRB 080310: REM observations
  86. GRB 080310: Magellan redshift
  87. GRB 080310 afterglow candidate (correction to UT time)
  88. GRB 080310: Swift detection of a burst with optical afterglow
  89. GRB 080310 afterglow candidate
  90. GRB080229, optical upper limit (Correction)
  91. GRB080307, optical upper limit
  92. GRB080307 BOAO optical afterglow observation - detection of a possible OT
  93. GRB080229, optical upper limit
  94. GRB 080307: Swift-XRT Team refined analysis
  95. GRB 080307: Swift/UVOT Upper Limits
  96. GRB 080307: Early RAPTOR Limits
  97. GRB 080307, Swift-BAT refined analysis
  98. GRB080307 - SDSS Pre-Burst Observations
  99. GRB 080307: TNT optical observation
  100. GRB080307: Optical upper limits

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