Skip to main content
New! Super-Kamiokande JSON Notices and Schema v4.5.0. 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"

26324 results found.

  1. GRB 060403: Swift/UVOT upper limits
  2. SGR 1900+14: BAT observations
  3. GRB 060403: Refined analysis of the Swift-BAT burst
  4. Konus-Wind observation of the recent SGR 1900+14 activity. Will
  5. GRB 060403: Swift detection of a burst
  6. HETE trigger H4044: RTT150 optical observations
  7. GRB060331: Swift/UVOT upper limits
  8. Swift XRT observations of the HETE transient H4043
  9. H4043, an unusual high-energy transient observed by HETE
  10. GRB 060322: LNA optical limit
  11. SGR 1900+14: bright burst detected by Konus-Wind on March 28
  12. INTEGRAL and XMM ToO observations of SGR1900+14
  13. SGR 1900+14: Swift-BAT detection of a bright outburst
  14. GRB 060323 : WIDGET simultaneous optical observations
  15. GRB 060323: Early optical observation at Xinglong
  16. GRB 060322: Confirmation of Swift XRT afterglow
  17. GRB060323: NOT optical observations
  18. GRB 060322: IAC80 optical observations
  19. GRB 060322: Swift XRT afterglow candidate
  20. GRB060323: P60 Observations
  21. GRB 060323: Swift/UVOT Observations
  22. GRB 060323: optical afterglow confirmed
  23. GRB060323: NOT observations
  24. GRB 060323: Optical Observations
  25. GRB 060323: Refined analysis of the Swift-BAT burst
  26. GRB 060323: optical observations at TNG
  27. GRB 060323: BVRI observations at Tautenburg, aftreglow candidate
  28. GRB 060322: Refined analysis of the Swift-BAT burst
  29. GRB060323, optical observation
  30. GRB060323 - SDSS Pre-Burst Observations
  31. GRB 060323: Swift detection of a burst with a possible optical afterglow
  32. GRB 060322: Swift-BAT detection of a 200-sec burst
  33. GRB 060218/SN 2006aj, LNA optical observation
  34. GRB060218: Refined photometric calibration of comparison stars
  35. GRB 060319: WHT K-band candidate afterglow
  36. GRB060319: Swift/UVOT upper limits
  37. GRB 060319: Swift-BAT refined analysis
  38. GRB 060319 optical observations at TNG
  39. GRB060319 : Liverpool Telescope optical limit
  40. GRB060319 - SDSS Pre-burst Observations
  41. GRB060313: Radio Observations
  42. GRB 060313: early afterglow NIR upper limits with REM
  43. GRB 060313: Further analysis of the Swift-BAT bright short hard burst
  44. GRB 060313: Swift/UVOT Observations
  45. GRB 060313: Refined analysis of the Swift-BAT bright short hard burst
  46. GRB 060313, SMARTS optical counterpart?
  47. GRB 060313, SMARTS optical/IR observations
  48. GRB060313: optical and near infrared observations with REM
  49. GRB060218: SARA Observations of SN2006aj
  50. GRB 060312: Refined analysis of the Swift-BAT burst
  51. GRB 060218/SN 2006aj, high resolution spectra
  52. GRB 060312: Swift XRT team refined analysis
  53. GRB060306: APO Ks-band Imaging Observations
  54. GRB 060312: ROTSE-III Optical Limits
  55. Bright short hard GRB 060303: IPN localization and Konus spectrum
  56. GRB060219: Liverpool Telescope observations
  57. GRB 060306: MAGNUM observations
  58. GRB060218: analysis of the XMM-Newton observation
  59. Swift/UVOT observations of GRB060306
  60. GRB 060306: Swift-BAT refined analysis
  61. GRB 060306: Swift-XRT team refined analysis
  62. GRB 060306: Swift detection of a bright burst
  63. GRB060218: Ep,i - Eiso correlation
  64. GRB060223b: optical limit
  65. GRB 060223b: Swift/UVOT Upper Limits
  66. GRB 060218/SN 2006aj: K-380 optical observations
  67. GRB 060218/SN 2006aj, SMARTS optical/IR observations
  68. GRB 060223B: Swift XRT possible afterglow
  69. GRB 060218/SN 2006aj: ABT observations
  70. GRB 060218/SN 2006aj: REM optical and near-infrared observations
  71. GRB 060218 : Radio upper limits from GMRT
  72. GRB 060218/SN 2006aj: RBO optical observations
  73. GRB 060204B: GETS early limit
  74. GRB 060223A:Xinglong optical limits
  75. GRB 060223B: Swift-BAT refined analysis
  76. GRB 060223a: Swift/UVOT refined analysis
  77. GRB 060223B: Swift detection of a bright burst
  78. GRB 060223: Swift-BAT refined analysis
  79. GRB 060223: Swift detection of a burst
  80. Spectral properties of GRB060218/SN2006aj
  81. GRB 060219: Swift-BAT refined analysis
  82. GRB 060218: Decline in r-band flux
  83. GRB060218: UV Detection and Light Curves
  84. GRB060219: SARA Observations
  85. GRB 060219: Swift/UVOT Upper Limits
  86. GRB 060219: Swift-XRT Team refined analysis
  87. GRB 051221B: Swift-XRT Team Refined Analysis
  88. GRB060218: Radio Afterglow Discovery
  89. GRB060219: SDSS pre-burst observations
  90. GRB 060219: Swift-BAT detection of a weak burst
  91. Oddball GRB 060218, transient or GRB?
  92. GRB060218: Swift/XRT Team preliminary analysis of the possible burst
  93. GRB 060218: Pre-burst detection of a possible host galaxy
  94. Further UVOT Observations of the Candidate Optical Afterglow for GRB 060218
  95. GRB 060211B: Swift/UVOT Upper Limits
  96. GRB060218 : SDSS pre-burst observations
  97. GRB 060218: Swift-BAT detection of a possible burst
  98. GRB 060213: optical afterglow not confirmed
  99. Swift UVOT observations of GRB060213
  100. GRB 060211B: Skynet Observations

Advanced

Download all Circulars as a .tar.gz archive:
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