Skip to main content
New! BOOM Notices and Schema v7.0.0. 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"

31635 results found.

  1. GRB 080315: Optical observations
  2. GRB080310 : Lulin Optical observations
  3. GRB080310, unusual slow decay in the optical
  4. GRB 080310: GAO 150cm telescope Optical Observation
  5. GRB080310 : Optical observations by LOAO and Lulin
  6. GRB 080310: ROTSE-III Observations of Optical Counterpart
  7. GRB080310: Optical observation by MITSuME telescope
  8. GRB080310, optical observations with the LBT
  9. GRB 080307: GAO 150cm telescope Optical Observation
  10. GRB 080229A: GAO 150cm telescope Optical Observation
  11. GRB 080310: PAIRITEL detection and PAIRITEL+KAIT+UVOT SED
  12. GRB 080307: NIR upper limit
  13. GRB 080229: NIR upper limit
  14. GRB 080310: early RAPTOR multicolor observations
  15. GRB 080310, Swift-BAT refined analysis
  16. GRB080210: optical observations
  17. GRB080307: optical upper limit
  18. GRB 080310: Swift-XRT refined analysis
  19. GRB 080310: Swift/UVOT Refined Analysis
  20. GRB 080310: Redshift from Keck/DEIMOS Spectra
  21. GRB080310 : Lulin optical observation
  22. GRB 080310: RRM optical photometry with the VLT
  23. GRB080310, detection of break in optical
  24. GRB 080310: VLT/UVES spectroscopy
  25. GRB080310, optical observations with LBT
  26. GRB 080310: Magellan redshift revision
  27. GRB 080310: Lick/Kast Spectroscopy
  28. GRB080310: Super-LOTIS suggestion of brightening
  29. GRB 080310, SMARTS optical/IR afterglow observations
  30. GRB 080310: REM observations
  31. GRB080307, optical upper limit
  32. GRB080229, optical upper limit
  33. GRB 080307: Swift-XRT Team refined analysis
  34. GRB 080307: Swift/UVOT Upper Limits
  35. GRB 080307: Early RAPTOR Limits
  36. GRB 080307, Swift-BAT refined analysis
  37. GRB 080307: TNT optical observation
  38. GRB080307: Optical upper limits
  39. GRB 080307: Gemini-N i-band observations - candidate afterglow
  40. GRB 080307: BOAO imaging - retraction and new limit
  41. GRB 080307: retraction of UVOT candidate
  42. GRB 080307, Preliminary Swift-BAT refined analysis
  43. VLA possible radio detection of GRB 080229
  44. GRB 080303: Swift/UVOT follow-up of afterglow detection
  45. GRB 080303, Swift-BAT refined analysis
  46. GRB 080303: Rapid PROMPT Detections
  47. GRB080303: Swift XRT refined analysis
  48. Swift UVOT observations of GRB080229B
  49. GRB080229B: Swift XRT afterglow observation
  50. GRB 080303A: Faulkes Telescope South optical afterglow observations
  51. GRB 080303A: ROTSE-III Optical Limits
  52. GRB 080229: I-band observations from OSN
  53. GRB 080229: VLT NIR observations
  54. GRB080229: Swift XRT refined analysis
  55. GRB 080229: TNG NIR observations
  56. GRB 080229: Deep Gemini/GMOS optical observations
  57. GRB 080229: REM NIR observations
  58. GRB080229: Possible optical afterglow
  59. UVOT analysis for GRB080229
  60. GRB 080229, Swift-BAT refined analysis
  61. GRB 080229: Faulkes Telescope South optical limit
  62. GRB 080229A: ROTSE-III Optical Limits
  63. Early optical shallow decay in GRB 071112C
  64. GRB080207: optical observations
  65. GRB080205: optical observations
  66. GRB080211: optical observations
  67. XRF 080109/SN2008D : GMRT upper limit at 1.28 GHz
  68. GRB 071010B : Early optical brightening detected by TAOS
  69. Swift-XRT improved positions, and new redshift limits.
  70. ESO optical and NIR observations of GRB 080218B
  71. GRB 080204: Suzaku WAM observation of the prompt emission
  72. GRB 080218B, Swift-BAT refined analysis
  73. GRB 080218B: Swift-XRT refined analysis
  74. Swift/UVOT observations of GRB080218B
  75. GRB 080218B: REM NIR early upper limits
  76. GRB 080212: Mount Abu NIR observations
  77. GRB 080218B: GROND upper limits
  78. GRB 080218b, SMARTS optical/IR limits
  79. GRB 080218A, Swift-BAT refined analysis
  80. GRB080218B: Watcher prompt limit
  81. GRB 080211: Suzaku WAM observation of the prompt emission
  82. Swift-XRT and UVOT observations of the IPN burst GRB 080211
  83. GRB 080212: VLT optical rapid decay
  84. GRB 080212: REM refined analysis
  85. Konus-Wind observation of GRB 080211
  86. VLA radio upper limit on GRB 080212
  87. Swift/UVOT refined analysis of GRB080212
  88. GRB 080212, Swift-BAT refined analysis
  89. GRB080212: Optical afterglow candidate observed by MITSuME Telescope
  90. GRB 080212: Gemini-South optical observations
  91. GRB 080212: GROND detects afterglow
  92. GRB 080212: REM NIR afterglow?
  93. GRB 080212: optical observations
  94. GRB 080212: Swift-XRT Team refined analysis
  95. GRB 080210: Keck photometry
  96. VLA non-detection of GRB 080210
  97. GRB 080207: VLT NIR early upper limits
  98. GRB 080210: Swift/UVOT Refined Analysis
  99. GRB 080207: optical observations.
  100. GRB 080210: Hobby-Eberly Telescope Absorption Spectroscopy

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