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"

37800 results found.

  1. GRB 060313: Possible optical counterpart
  2. GRB 060313: Swift XRT position
  3. GRB 060313, SMARTS optical/IR observations
  4. GRB060313: optical and near infrared observations with REM
  5. GRB 060313: Swift-BAT detection of a bright short hard burst
  6. GRB060218: SARA Observations of SN2006aj
  7. GRB060312: Swift UVOT observation
  8. GRB 060312: Refined analysis of the Swift-BAT burst
  9. GRB 060218/SN 2006aj, high resolution spectra
  10. GRB 060312: Swift XRT team refined analysis
  11. GRB060306: APO Ks-band Imaging Observations
  12. GRB 060312: ROTSE-III Optical Limits
  13. GRB 060312: Swift detection of a burst
  14. IBAS Alert n. 3218 : not a real GRB
  15. GRB 060306: SOAR Ks Observations
  16. Bright short hard GRB 060303: IPN localization and Konus spectrum
  17. GRB 060306: MAGNUM observations
  18. GRB060218: analysis of the XMM-Newton observation
  19. Swift/UVOT observations of GRB060306
  20. GRB 060306: Swift-BAT refined analysis
  21. GRB 060306: Swift-XRT team refined analysis
  22. GRB 060306: PROMPT Observations
  23. GRB 060306: Swift detection of a bright burst
  24. GRB 060218: RTT150 optical observations
  25. GRB060218: Ep,i - Eiso correlation
  26. GRB060223b: optical limit
  27. GRB060218/SN 2006aj: optical observation in V
  28. GRB060218/SN 2006aj: optical observation
  29. GRB 060121: HST observations
  30. GRB 060218 : GMRT observation [Correction and Improvement]
  31. GRB 060223b: Swift/UVOT Upper Limits
  32. GRB 060218/SN 2006aj: K-380 optical observations
  33. GRB 060218/SN 2006aj, SMARTS optical/IR observations
  34. GRB 060223B: Swift XRT possible afterglow
  35. GRB 060218/SN 2006aj: ABT observations
  36. GRB 060218/SN 2006aj: REM optical and near-infrared observations
  37. GRB 060218 : Radio upper limits from GMRT
  38. GRB 060218/SN 2006aj: WIRO optical observations
  39. GRB 060218/SN 2006aj: RBO optical observations
  40. GRB 060204B: GETS early limit
  41. GRB 060218: Refined analysis of the radio afterglow
  42. GRB 060223A:Xinglong optical limits
  43. GRB 060223B: ART optical limits
  44. GRB 060223B: Swift-BAT refined analysis
  45. GRB 060223a: Swift/UVOT refined analysis
  46. GRB 060223: Swift XRT Team preliminary analysis
  47. GRB 060218/SN 2006aj: Swift-BAT fluence and peak flux
  48. GRB 060223B: Swift detection of a bright burst
  49. GRB 060223: Swift-BAT refined analysis
  50. GRB 060218: rebrightening
  51. GRB 060218/SN 2006aj: optical observations
  52. GRB 060223: Keck redshift
  53. GRB 060223: Swift/UVOT Confirmation of Optical Afterglow
  54. GRB 060223: Swift detection of a burst
  55. Spectral properties of GRB060218/SN2006aj
  56. GRB 060219: Swift-BAT refined analysis
  57. GRB 060218: rebrightening
  58. GRB 060218: emergence of the underlying SN spectrum
  59. GRB 060218: Decline in r-band flux
  60. GRB 060218: spectroscopic observations
  61. GRB 060218: Further refined analysis of the Swift-BAT burst
  62. GRB 060218: Likely an underluminous GRB
  63. GRB060218: Optical Spectroscopy of GRB-SN
  64. GRB060218: VLT spectroscopy
  65. GRB 060218: Optical Observations at Xinglong Obs.
  66. GRB 060219: SDSS galaxy inside XRT error circle
  67. GRB060218: UV Detection and Light Curves
  68. GRB060219: SARA Observations
  69. GRB 060219: Swift/UVOT Upper Limits
  70. GRB 060219: Swift-XRT Team refined analysis
  71. GRB 051221B: Swift-XRT Team Refined Analysis
  72. GRB 060219: Partial refined analysis of the Swift-BAT burst
  73. GRB060218: Radio Afterglow Discovery
  74. GRB 060219: Swift-XRT position typo correction
  75. GRB 060218: MDM Redshift
  76. GRB 060219: Swift-XRT position
  77. GRB 060218: optical/nIR observations at La Palma
  78. GRB060219: SDSS pre-burst observations
  79. GRB 060219: Swift-BAT detection of a weak burst
  80. Oddball GRB 060218, transient or GRB?
  81. GRB060218: Swift/XRT Team preliminary analysis of the possible burst
  82. Brightening of the Optical Counterpart of the Possible GRB 060218
  83. GRB 060218: MDM Observations
  84. GRB 060218: Pre-burst detection of a possible host galaxy
  85. GRB 060218A: ROTSE-III Possible Optical Flare
  86. GRB060218: Swift/XRT refined position of a possible burst
  87. Preliminary refined analysis of the Swift-BAT trigger 191157
  88. Further UVOT Observations of the Candidate Optical Afterglow for GRB 060218
  89. GRB 060211B: Swift/UVOT Upper Limits
  90. GRB060218 : SDSS pre-burst observations
  91. GRB 060218: Swift XRT Position
  92. GRB 060218: Swift-BAT detection of a possible burst
  93. GRB 060213: optical afterglow not confirmed
  94. Swift UVOT observations of GRB060213
  95. GRB 060211B: Skynet Observations
  96. GRB 060213: optical afterglow candidate
  97. GRB060213: Swift XRT observations and possible afterglow candidate
  98. GRB 060213: pseudo-z = 3.5 +/- 0.35 from spectral parameters
  99. GRB 060206: Confirmation of Rapid Fading at Optical Wavelengths
  100. GRB060213: MASTER final result

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