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"

37570 results found.

  1. GRB 060218: Refined analysis of the radio afterglow
  2. GRB 060223A:Xinglong optical limits
  3. GRB 060223B: ART optical limits
  4. GRB 060223B: Swift-BAT refined analysis
  5. GRB 060223a: Swift/UVOT refined analysis
  6. GRB 060223: Swift XRT Team preliminary analysis
  7. GRB 060218/SN 2006aj: Swift-BAT fluence and peak flux
  8. GRB 060223B: Swift detection of a bright burst
  9. GRB 060223: Swift-BAT refined analysis
  10. GRB 060218: rebrightening
  11. GRB 060218/SN 2006aj: optical observations
  12. GRB 060223: Keck redshift
  13. GRB 060223: Swift/UVOT Confirmation of Optical Afterglow
  14. GRB 060223: Swift detection of a burst
  15. Spectral properties of GRB060218/SN2006aj
  16. GRB 060219: Swift-BAT refined analysis
  17. GRB 060218: rebrightening
  18. GRB 060218: emergence of the underlying SN spectrum
  19. GRB 060218: Decline in r-band flux
  20. GRB 060218: spectroscopic observations
  21. GRB 060218: Further refined analysis of the Swift-BAT burst
  22. GRB 060218: Likely an underluminous GRB
  23. GRB060218: Optical Spectroscopy of GRB-SN
  24. GRB060218: VLT spectroscopy
  25. GRB 060218: Optical Observations at Xinglong Obs.
  26. GRB 060219: SDSS galaxy inside XRT error circle
  27. GRB060218: UV Detection and Light Curves
  28. GRB060219: SARA Observations
  29. GRB 060219: Swift/UVOT Upper Limits
  30. GRB 060219: Swift-XRT Team refined analysis
  31. GRB 051221B: Swift-XRT Team Refined Analysis
  32. GRB 060219: Partial refined analysis of the Swift-BAT burst
  33. GRB060218: Radio Afterglow Discovery
  34. GRB 060219: Swift-XRT position typo correction
  35. GRB 060218: MDM Redshift
  36. GRB 060219: Swift-XRT position
  37. GRB 060218: optical/nIR observations at La Palma
  38. GRB060219: SDSS pre-burst observations
  39. GRB 060219: Swift-BAT detection of a weak burst
  40. Oddball GRB 060218, transient or GRB?
  41. GRB060218: Swift/XRT Team preliminary analysis of the possible burst
  42. Brightening of the Optical Counterpart of the Possible GRB 060218
  43. GRB 060218: MDM Observations
  44. GRB 060218: Pre-burst detection of a possible host galaxy
  45. GRB 060218A: ROTSE-III Possible Optical Flare
  46. Preliminary refined analysis of the Swift-BAT trigger 191157
  47. Further UVOT Observations of the Candidate Optical Afterglow for GRB 060218
  48. GRB 060211B: Swift/UVOT Upper Limits
  49. GRB060218 : SDSS pre-burst observations
  50. GRB 060218: Swift XRT Position
  51. GRB 060218: Swift-BAT detection of a possible burst
  52. GRB 060213: optical afterglow not confirmed
  53. Swift UVOT observations of GRB060213
  54. GRB 060211B: Skynet Observations
  55. GRB 060213: optical afterglow candidate
  56. GRB060213: Swift XRT observations and possible afterglow candidate
  57. GRB 060213: pseudo-z = 3.5 +/- 0.35 from spectral parameters
  58. GRB 060206: Confirmation of Rapid Fading at Optical Wavelengths
  59. GRB060213: MASTER final result
  60. GRB 060211b: WIRO NIR Observations
  61. GRB060213:_MASTER_optical_observation
  62. Konus-Wind observation of bright hard GRB 060213
  63. GRB 060213: IPN localization
  64. GRB 060210: Radio Observations
  65. GRB 060211a: WIRO NIR Observations
  66. GRB060211B: REM optical and NIR observations
  67. GRB 060211B: BAT detects no additional burst emission beyond T + 122 sec
  68. GRB 060211A: Further refined analysis of the Swift burst
  69. GRB060121: optical observations
  70. GRB060110: optical observations
  71. GRB060105: optical observations
  72. GRB 060210: ARC NIR Detection of Afterglow and Possible Host Galaxy
  73. GRB 060211b: P60 Observations
  74. GRB 060211A: Partial refined analysis on the Swift-BAT burst
  75. GRB 060206: SOAR Detections
  76. GRB 050826: Optical Afterglow and Host Galaxy
  77. GRB 060210: Further refined analysis of the Swift-BAT burst
  78. GRB 060211B: Swift/BAT refined analysis
  79. GRB060210: Swift/UVOT Upper Limits
  80. GRB 060211B: Swift-XRT Team refined analysis
  81. GRB060211b: optical observation
  82. GRB 060210: Optical Observations
  83. GRB060211.7: MASTER_optical_observation under the snow
  84. GRB 060211A: Swift XRT Team Refined Analysis
  85. GRB 060211B: Swift-BAT detection of a burst
  86. GRB060211: Faulkes North observation
  87. GRB 060211: ROTSE-III Optical Limits
  88. GRB 060211: Swift detection of a long burst
  89. GRB 060210: Refined analysis of the Swift-BAT burst
  90. GRB060210: Swift XRT Refined Analysis
  91. GRB060206, optical observations
  92. GRB 060210 : Xinglong and Lulin optical limit
  93. GRB060210: Gemini absorption spectroscopy
  94. GRB 060210: optical evolution
  95. GRB060210:Faulkes Telescope North Afterglow Confirmation
  96. GRB 060210: candidate afterglow
  97. GRB 060210: Swift detection of a burst
  98. GRB 060206: Swift/UVOT Observations
  99. Swift-BAT trigger 180931 is not a GRB
  100. GRB060209: RTT150 optical observations

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