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"

15252 results found.

  1. GRB 060218/SN 2006aj: ABT observations
  2. GRB 060218/SN 2006aj: WIRO optical observations
  3. GRB 060218/SN 2006aj: RBO optical observations
  4. GRB 060223B: Swift-BAT refined analysis
  5. GRB 060218/SN 2006aj: Swift-BAT fluence and peak flux
  6. GRB 060223: Swift-BAT refined analysis
  7. Correction to GCN 4816 on GRB060218
  8. GRB 060223: Swift/UVOT Confirmation of Optical Afterglow
  9. GRB 060218: Likely an underluminous GRB
  10. GRB 060219: Swift/UVOT Upper Limits
  11. GRB 060219: Swift-XRT Team refined analysis
  12. GRB 060219: Swift-XRT position typo correction
  13. GRB 060218: MDM Redshift
  14. GRB 060218: optical/nIR observations at La Palma
  15. GRB060219: SDSS pre-burst observations
  16. GRB060218: Swift/XRT Team preliminary analysis of the possible burst
  17. Brightening of the Optical Counterpart of the Possible GRB 060218
  18. GRB 060218: Pre-burst detection of a possible host galaxy
  19. GRB 060218A: ROTSE-III Possible Optical Flare
  20. GRB060218: Swift/XRT refined position of a possible burst
  21. Further UVOT Observations of the Candidate Optical Afterglow for GRB 060218
  22. GRB 060211B: Swift/UVOT Upper Limits
  23. GRB060218 : SDSS pre-burst observations
  24. GRB 060218: Swift XRT Position
  25. GRB 060211b: WIRO NIR Observations
  26. GRB060206: Swift XRT observations of an unbroken powerlaw decay
  27. Konus-Wind observation of bright hard GRB 060213
  28. GRB 060211a: WIRO NIR Observations
  29. GRB 060211A: Further refined analysis of the Swift burst
  30. GRB 060211B: Swift-XRT Team refined analysis
  31. GRB060211B: Swift/XRT position
  32. GRB 060210: Optical Observations
  33. GRB060210: Swift XRT Refined Analysis
  34. GRB060210: Early Optical Observations
  35. GRB 060206: Swift/UVOT Observations
  36. GRB 060203: Swift/UVOT upper limits
  37. GRB 060121 : WIDGET Pre-trigger limit
  38. Retraction of orphan GRB afterglow candidate
  39. GRB 060206: Subaru/FOCAS optical spectroscopy
  40. GRB 060206: IR Detection of the Afterglow
  41. GRB060204A: Swift/UVOT observations
  42. GRB 060206: Swift-BAT refined analysis
  43. GRB060206: SDSS Pre-Burst Observations
  44. GRB060206: Swift XRT Refined Analysis
  45. GRB060206: P60 Optical Observations
  46. GRB 060206: KAIT observations
  47. GRB060206: Swift XRT Position
  48. GRB060206: SARA Detection
  49. GRB 060206: RAPTOR observations of afterglow candidate variability.
  50. GRB 060206: High redshift burst
  51. GRB060204a: Swift XRT Detection of an Afterglow Candidate
  52. GRB060206 - Swift UVOT Confirmation of Optical Afterglow
  53. GRB 060204C: XRT analysis of Swift J061223.0+701243.9
  54. GRB 060204B: BVRi-band detections of optical afterglow
  55. GRB060204B: Swift/UVOT refined analysis
  56. GRB 060204B: ART early limit
  57. GRB060204B: Swift XRT Team Refined Analysis
  58. GRB 060204A: further INTEGRAL results
  59. GRB060204B - SDSS pre-burst observations
  60. GRB 060202: UKIRT/WFCAM K-band and KeckI/LRIS I-band Observation
  61. GRB060203 - Swift UVOT observation
  62. Swift BAT Trigger 180151: Swift XRT source detection
  63. GRB 060202: Near-IR Observation with UKIRT/WFCAM
  64. GRB 060202: Optical Afterglow Candidate from Keck/LRIS
  65. GRB 060121: Gemini Late-time Observations
  66. GRB 051211A: MDM Observations
  67. GRB 060130: further INTEGRAL IBIS results
  68. GRB050121b: optical observation
  69. GRB 060121: Confirmation of NIR Afterglow
  70. GRB060105: refined analysis of the Suzaku observation
  71. GRB060124 optical observations
  72. GRB 060116 HST observations
  73. GRB 060124: HETE detection and spectrum of the main peak
  74. Refined XRT Position for GRB 060123
  75. Konus-Wind observation of GRB 060124
  76. GRB060123: Optical and IR Imaging
  77. GRB 060124: Keck optical spectrum
  78. GRB 060124: Keck Absorption Redshift
  79. GRB 060124 : Optical observation at Xinglong and Kiso
  80. GRB 060124: Extremely long burst, Swift-BAT refined analysis
  81. GRB060123: SDSS pre-burst observations
  82. GRB 060123: Swift detection of a very long, faint burst
  83. GRB 060116: Further analysis of VLT photometry and optical spectroscopy
  84. GRB 060124: Confirmation of the Afterglow
  85. GRB 060117: Suzaku WAM observation of the prompt emission
  86. GRB 060111B: Suzaku WAM observation of the prompt emission
  87. GRB 060116: MARGE optical observations
  88. Konus-Wind observation of GRB 060121
  89. GRB 060121: optical observations
  90. GRB060121 - SDSS pre-burst observations
  91. GRB 060121 (=H4010): Results of preliminary spectral analysis
  92. GRB 060121: A bright short/hard GRB localized by HETE-2 WXM
  93. GRB 060117: PROMPT Observations
  94. Konus-Wind observation of GRB 060117
  95. GRB 060116: UKIRT IR Observations
  96. GRB060108: photometric redshift determination
  97. GRB 060117: FRAM refined analysis
  98. GRB 060117: nearby galaxy
  99. GRB 060116: VLT optical observations
  100. GRB 060116: XRT refined analysis

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