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"

26334 results found.

  1. GRB 060418, SMARTS optical/IR afterglow observations
  2. GRB060418 : LT optical afterglow observation
  3. GRB 060418: REM candidate afterglow
  4. GRB 060418: Swift detection of a burst with bright x-ray and optical afterglow
  5. GRB060413: Swift/UVOT upper limits
  6. GRB 060413: REM NIR Observations
  7. GRB 060413: Refined analysis of the Swift-BAT burst
  8. GRB 060403: MITSuME optical observation
  9. GRB060403: Optical Limit
  10. GRB060403: XRT refined analysis
  11. GRB 060403: Swift/UVOT upper limits
  12. SGR 1900+14: BAT observations
  13. GRB 060403: Refined analysis of the Swift-BAT burst
  14. Konus-Wind observation of the recent SGR 1900+14 activity. Will
  15. GRB 060403: Swift detection of a burst
  16. HETE trigger H4044: RTT150 optical observations
  17. GRB060331: Swift/UVOT upper limits
  18. Swift XRT observations of the HETE transient H4043
  19. H4043, an unusual high-energy transient observed by HETE
  20. GRB 060322: LNA optical limit
  21. SGR 1900+14: bright burst detected by Konus-Wind on March 28
  22. INTEGRAL and XMM ToO observations of SGR1900+14
  23. SGR 1900+14: Swift-BAT detection of a bright outburst
  24. GRB 060323 : WIDGET simultaneous optical observations
  25. GRB 060323: Early optical observation at Xinglong
  26. GRB 060322: Confirmation of Swift XRT afterglow
  27. GRB060323: NOT optical observations
  28. GRB 060322: IAC80 optical observations
  29. GRB 060322: Swift XRT afterglow candidate
  30. GRB060323: P60 Observations
  31. GRB 060323: Swift/UVOT Observations
  32. GRB 060323: optical afterglow confirmed
  33. GRB060323: NOT observations
  34. GRB 060323: Optical Observations
  35. GRB 060323: Refined analysis of the Swift-BAT burst
  36. GRB 060323: optical observations at TNG
  37. GRB 060323: BVRI observations at Tautenburg, aftreglow candidate
  38. GRB 060322: Refined analysis of the Swift-BAT burst
  39. GRB060323, optical observation
  40. GRB060323 - SDSS Pre-Burst Observations
  41. GRB 060323: Swift detection of a burst with a possible optical afterglow
  42. GRB 060322: Swift-BAT detection of a 200-sec burst
  43. GRB 060218/SN 2006aj, LNA optical observation
  44. GRB060218: Refined photometric calibration of comparison stars
  45. GRB 060319: WHT K-band candidate afterglow
  46. GRB060319: Swift/UVOT upper limits
  47. GRB 060319: Swift-BAT refined analysis
  48. GRB 060319 optical observations at TNG
  49. GRB060319 : Liverpool Telescope optical limit
  50. GRB060319 - SDSS Pre-burst Observations
  51. GRB060313: Radio Observations
  52. GRB 060313: early afterglow NIR upper limits with REM
  53. GRB 060313: Further analysis of the Swift-BAT bright short hard burst
  54. GRB 060313: Swift/UVOT Observations
  55. GRB 060313: Refined analysis of the Swift-BAT bright short hard burst
  56. GRB 060313, SMARTS optical counterpart?
  57. GRB 060313, SMARTS optical/IR observations
  58. GRB060313: optical and near infrared observations with REM
  59. GRB060218: SARA Observations of SN2006aj
  60. GRB 060312: Refined analysis of the Swift-BAT burst
  61. GRB 060218/SN 2006aj, high resolution spectra
  62. GRB 060312: Swift XRT team refined analysis
  63. GRB060306: APO Ks-band Imaging Observations
  64. GRB 060312: ROTSE-III Optical Limits
  65. Bright short hard GRB 060303: IPN localization and Konus spectrum
  66. GRB060219: Liverpool Telescope observations
  67. GRB 060306: MAGNUM observations
  68. GRB060218: analysis of the XMM-Newton observation
  69. Swift/UVOT observations of GRB060306
  70. GRB 060306: Swift-BAT refined analysis
  71. GRB 060306: Swift-XRT team refined analysis
  72. GRB 060306: Swift detection of a bright burst
  73. GRB060218: Ep,i - Eiso correlation
  74. GRB060223b: optical limit
  75. GRB 060223b: Swift/UVOT Upper Limits
  76. GRB 060218/SN 2006aj: K-380 optical observations
  77. GRB 060218/SN 2006aj, SMARTS optical/IR observations
  78. GRB 060223B: Swift XRT possible afterglow
  79. GRB 060218/SN 2006aj: ABT observations
  80. GRB 060218/SN 2006aj: REM optical and near-infrared observations
  81. GRB 060218 : Radio upper limits from GMRT
  82. GRB 060218/SN 2006aj: RBO optical observations
  83. GRB 060204B: GETS early limit
  84. GRB 060223A:Xinglong optical limits
  85. GRB 060223B: Swift-BAT refined analysis
  86. GRB 060223a: Swift/UVOT refined analysis
  87. GRB 060223B: Swift detection of a bright burst
  88. GRB 060223: Swift-BAT refined analysis
  89. GRB 060223: Swift detection of a burst
  90. Spectral properties of GRB060218/SN2006aj
  91. GRB 060219: Swift-BAT refined analysis
  92. GRB 060218: Decline in r-band flux
  93. GRB060218: UV Detection and Light Curves
  94. GRB060219: SARA Observations
  95. GRB 060219: Swift/UVOT Upper Limits
  96. GRB 060219: Swift-XRT Team refined analysis
  97. GRB 051221B: Swift-XRT Team Refined Analysis
  98. GRB060218: Radio Afterglow Discovery
  99. GRB060219: SDSS pre-burst observations
  100. GRB 060219: Swift-BAT detection of a weak burst

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