Skip to main content
JSON Notices via Email, Kafka Cron Jobs, Submitter Profile, GCN is Hiring. See news and announcements

GCN Circulars

GCN Circulars are rapid bulletins submitted by and distributed to the community. 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"

36342 results found.

  1. GRB 060218: MDM Redshift
  2. GRB 060219: Swift-XRT position
  3. GRB 060218: optical/nIR observations at La Palma
  4. GRB060219: SDSS pre-burst observations
  5. GRB 060219: Swift-BAT detection of a weak burst
  6. Oddball GRB 060218, transient or GRB?
  7. GRB060218: Swift/XRT Team preliminary analysis of the possible burst
  8. Brightening of the Optical Counterpart of the Possible GRB 060218
  9. GRB 060218: MDM Observations
  10. GRB 060218: Pre-burst detection of a possible host galaxy
  11. GRB 060218A: ROTSE-III Possible Optical Flare
  12. Preliminary refined analysis of the Swift-BAT trigger 191157
  13. Further UVOT Observations of the Candidate Optical Afterglow for GRB 060218
  14. GRB 060211B: Swift/UVOT Upper Limits
  15. GRB060218 : SDSS pre-burst observations
  16. GRB 060218: Swift XRT Position
  17. GRB 060218: Swift-BAT detection of a possible burst
  18. GRB 060213: optical afterglow not confirmed
  19. Swift UVOT observations of GRB060213
  20. GRB 060211B: Skynet Observations
  21. GRB 060213: optical afterglow candidate
  22. GRB060213: Swift XRT observations and possible afterglow candidate
  23. GRB 060213: pseudo-z = 3.5 +/- 0.35 from spectral parameters
  24. GRB 060206: Confirmation of Rapid Fading at Optical Wavelengths
  25. GRB060213: MASTER final result
  26. GRB 060211b: WIRO NIR Observations
  27. GRB060213:_MASTER_optical_observation
  28. Konus-Wind observation of bright hard GRB 060213
  29. GRB 060213: IPN localization
  30. GRB 060210: Radio Observations
  31. GRB 060211a: WIRO NIR Observations
  32. GRB060211B: REM optical and NIR observations
  33. GRB 060211B: BAT detects no additional burst emission beyond T + 122 sec
  34. GRB 060211A: Further refined analysis of the Swift burst
  35. GRB060121: optical observations
  36. GRB060110: optical observations
  37. GRB060105: optical observations
  38. GRB 060210: ARC NIR Detection of Afterglow and Possible Host Galaxy
  39. GRB 060211b: P60 Observations
  40. GRB 060211A: Partial refined analysis on the Swift-BAT burst
  41. GRB 060206: SOAR Detections
  42. GRB 050826: Optical Afterglow and Host Galaxy
  43. GRB 060210: Further refined analysis of the Swift-BAT burst
  44. GRB 060211B: Swift/BAT refined analysis
  45. GRB060210: Swift/UVOT Upper Limits
  46. GRB 060211B: Swift-XRT Team refined analysis
  47. GRB060211b: optical observation
  48. GRB 060210: Optical Observations
  49. GRB060211.7: MASTER_optical_observation under the snow
  50. GRB 060211A: Swift XRT Team Refined Analysis
  51. GRB 060211B: Swift-BAT detection of a burst
  52. GRB060211: Faulkes North observation
  53. GRB 060211: ROTSE-III Optical Limits
  54. GRB 060211: Swift detection of a long burst
  55. GRB 060210: Refined analysis of the Swift-BAT burst
  56. GRB060210: Swift XRT Refined Analysis
  57. GRB060206, optical observations
  58. GRB 060210 : Xinglong and Lulin optical limit
  59. GRB060210: Gemini absorption spectroscopy
  60. GRB 060210: optical evolution
  61. GRB060210:Faulkes Telescope North Afterglow Confirmation
  62. GRB 060210: candidate afterglow
  63. GRB 060210: Swift detection of a burst
  64. GRB 060206: Swift/UVOT Observations
  65. Swift-BAT trigger 180931 is not a GRB
  66. GRB060209: RTT150 optical observations
  67. GRB 060209 : TAROT optical observation
  68. GRB060209A: MASTER optical observation
  69. GRB 060209(?): Swift-BAT detection of a possible burst
  70. GRB 060206: near-infrared observations (JK' imaging)
  71. GRB 060206: WSRT Radio Observations
  72. GRB 060203: Swift/UVOT upper limits
  73. GRB 060206: TTT Observations
  74. GRB 060206: More PROMPT Detections
  75. GRB 060121 : WIDGET Pre-trigger limit
  76. GRB 060206: Tenagra II Observations
  77. GRB 060206: PROMPT Detections
  78. Retraction of orphan GRB afterglow candidate
  79. GRB060204a: Swift XRT Source is not GRB Afterglow
  80. GRB 060206: optical observations at Asiago
  81. Orphan GRB Afterglow candidate
  82. GRB 060204b: pseudo-z from spectral parameters of the prompt emission
  83. GRB 060206: Subaru/FOCAS optical spectroscopy
  84. GRB 060206: IR Detection of the Afterglow
  85. GRB 060206: Lick 3m Spectroscopy
  86. GRB 060204A: ROSAT Pointing
  87. GRB 060206: Super-LOTIS observations
  88. GRB060204A: Swift/UVOT observations
  89. GRB 060206: Swift-BAT refined analysis
  90. GRB 060206 : Lulin optical observations
  91. GRB060206: SDSS Pre-Burst Observations
  92. GRB060206: Swift XRT Refined Analysis
  93. GRB060206: Liverpool Telescope observation
  94. GRB 060206: Spectroscopic Redshift
  95. GRB060206: P60 Optical Observations
  96. GRB 060206: KAIT observations
  97. GRB060206: Swift XRT Position
  98. GRB060206: SARA Detection
  99. GRB 060206: RAPTOR observations of afterglow candidate variability.
  100. GRB 060206: High redshift burst

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