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"

36363 results found.

  1. GRB 060223: Swift detection of a burst
  2. Spectral properties of GRB060218/SN2006aj
  3. GRB 060219: Swift-BAT refined analysis
  4. GRB 060218: rebrightening
  5. GRB 060218: emergence of the underlying SN spectrum
  6. GRB 060218: Decline in r-band flux
  7. GRB 060218: spectroscopic observations
  8. GRB 060218: Further refined analysis of the Swift-BAT burst
  9. GRB 060218: Likely an underluminous GRB
  10. GRB060218: Optical Spectroscopy of GRB-SN
  11. GRB060218: VLT spectroscopy
  12. GRB 060218: Optical Observations at Xinglong Obs.
  13. GRB 060219: SDSS galaxy inside XRT error circle
  14. GRB060218: UV Detection and Light Curves
  15. GRB060219: SARA Observations
  16. GRB 060219: Swift/UVOT Upper Limits
  17. GRB 060219: Swift-XRT Team refined analysis
  18. GRB 051221B: Swift-XRT Team Refined Analysis
  19. GRB 060219: Partial refined analysis of the Swift-BAT burst
  20. GRB060218: Radio Afterglow Discovery
  21. GRB 060219: Swift-XRT position typo correction
  22. GRB 060218: MDM Redshift
  23. GRB 060219: Swift-XRT position
  24. GRB 060218: optical/nIR observations at La Palma
  25. GRB060219: SDSS pre-burst observations
  26. GRB 060219: Swift-BAT detection of a weak burst
  27. Oddball GRB 060218, transient or GRB?
  28. GRB060218: Swift/XRT Team preliminary analysis of the possible burst
  29. Brightening of the Optical Counterpart of the Possible GRB 060218
  30. GRB 060218: MDM Observations
  31. GRB 060218: Pre-burst detection of a possible host galaxy
  32. GRB 060218A: ROTSE-III Possible Optical Flare
  33. Preliminary refined analysis of the Swift-BAT trigger 191157
  34. Further UVOT Observations of the Candidate Optical Afterglow for GRB 060218
  35. GRB 060211B: Swift/UVOT Upper Limits
  36. GRB060218 : SDSS pre-burst observations
  37. GRB 060218: Swift XRT Position
  38. GRB 060218: Swift-BAT detection of a possible burst
  39. GRB 060213: optical afterglow not confirmed
  40. Swift UVOT observations of GRB060213
  41. GRB 060211B: Skynet Observations
  42. GRB 060213: optical afterglow candidate
  43. GRB060213: Swift XRT observations and possible afterglow candidate
  44. GRB 060213: pseudo-z = 3.5 +/- 0.35 from spectral parameters
  45. GRB 060206: Confirmation of Rapid Fading at Optical Wavelengths
  46. GRB060213: MASTER final result
  47. GRB 060211b: WIRO NIR Observations
  48. GRB060213:_MASTER_optical_observation
  49. Konus-Wind observation of bright hard GRB 060213
  50. GRB 060213: IPN localization
  51. GRB 060210: Radio Observations
  52. GRB 060211a: WIRO NIR Observations
  53. GRB060211B: REM optical and NIR observations
  54. GRB 060211B: BAT detects no additional burst emission beyond T + 122 sec
  55. GRB 060211A: Further refined analysis of the Swift burst
  56. GRB060121: optical observations
  57. GRB060110: optical observations
  58. GRB060105: optical observations
  59. GRB 060210: ARC NIR Detection of Afterglow and Possible Host Galaxy
  60. GRB 060211b: P60 Observations
  61. GRB 060211A: Partial refined analysis on the Swift-BAT burst
  62. GRB 060206: SOAR Detections
  63. GRB 050826: Optical Afterglow and Host Galaxy
  64. GRB 060210: Further refined analysis of the Swift-BAT burst
  65. GRB 060211B: Swift/BAT refined analysis
  66. GRB060210: Swift/UVOT Upper Limits
  67. GRB 060211B: Swift-XRT Team refined analysis
  68. GRB060211b: optical observation
  69. GRB 060210: Optical Observations
  70. GRB060211.7: MASTER_optical_observation under the snow
  71. GRB 060211A: Swift XRT Team Refined Analysis
  72. GRB 060211B: Swift-BAT detection of a burst
  73. GRB060211: Faulkes North observation
  74. GRB 060211: ROTSE-III Optical Limits
  75. GRB 060211: Swift detection of a long burst
  76. GRB 060210: Refined analysis of the Swift-BAT burst
  77. GRB060210: Swift XRT Refined Analysis
  78. GRB060206, optical observations
  79. GRB 060210 : Xinglong and Lulin optical limit
  80. GRB060210: Gemini absorption spectroscopy
  81. GRB 060210: optical evolution
  82. GRB060210:Faulkes Telescope North Afterglow Confirmation
  83. GRB 060210: candidate afterglow
  84. GRB 060210: Swift detection of a burst
  85. GRB 060206: Swift/UVOT Observations
  86. Swift-BAT trigger 180931 is not a GRB
  87. GRB060209: RTT150 optical observations
  88. GRB 060209 : TAROT optical observation
  89. GRB060209A: MASTER optical observation
  90. GRB 060209(?): Swift-BAT detection of a possible burst
  91. GRB 060206: near-infrared observations (JK' imaging)
  92. GRB 060206: WSRT Radio Observations
  93. GRB 060203: Swift/UVOT upper limits
  94. GRB 060206: TTT Observations
  95. GRB 060206: More PROMPT Detections
  96. GRB 060121 : WIDGET Pre-trigger limit
  97. GRB 060206: Tenagra II Observations
  98. GRB 060206: PROMPT Detections
  99. Retraction of orphan GRB afterglow candidate
  100. GRB060204a: Swift XRT Source is not GRB Afterglow

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