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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"

26327 results found.

  1. GRB 060403: MITSuME optical observation
  2. GRB060403: Optical Limit
  3. GRB060403: XRT refined analysis
  4. GRB 060403: Swift/UVOT upper limits
  5. SGR 1900+14: BAT observations
  6. GRB 060403: Refined analysis of the Swift-BAT burst
  7. Konus-Wind observation of the recent SGR 1900+14 activity. Will
  8. GRB 060403: Swift detection of a burst
  9. HETE trigger H4044: RTT150 optical observations
  10. GRB060331: Swift/UVOT upper limits
  11. Swift XRT observations of the HETE transient H4043
  12. H4043, an unusual high-energy transient observed by HETE
  13. GRB 060322: LNA optical limit
  14. SGR 1900+14: bright burst detected by Konus-Wind on March 28
  15. INTEGRAL and XMM ToO observations of SGR1900+14
  16. SGR 1900+14: Swift-BAT detection of a bright outburst
  17. GRB 060323 : WIDGET simultaneous optical observations
  18. GRB 060323: Early optical observation at Xinglong
  19. GRB 060322: Confirmation of Swift XRT afterglow
  20. GRB060323: NOT optical observations
  21. GRB 060322: IAC80 optical observations
  22. GRB 060322: Swift XRT afterglow candidate
  23. GRB060323: P60 Observations
  24. GRB 060323: Swift/UVOT Observations
  25. GRB 060323: optical afterglow confirmed
  26. GRB060323: NOT observations
  27. GRB 060323: Optical Observations
  28. GRB 060323: Refined analysis of the Swift-BAT burst
  29. GRB 060323: optical observations at TNG
  30. GRB 060323: BVRI observations at Tautenburg, aftreglow candidate
  31. GRB 060322: Refined analysis of the Swift-BAT burst
  32. GRB060323, optical observation
  33. GRB060323 - SDSS Pre-Burst Observations
  34. GRB 060323: Swift detection of a burst with a possible optical afterglow
  35. GRB 060322: Swift-BAT detection of a 200-sec burst
  36. GRB 060218/SN 2006aj, LNA optical observation
  37. GRB060218: Refined photometric calibration of comparison stars
  38. GRB 060319: WHT K-band candidate afterglow
  39. GRB060319: Swift/UVOT upper limits
  40. GRB 060319: Swift-BAT refined analysis
  41. GRB 060319 optical observations at TNG
  42. GRB060319 : Liverpool Telescope optical limit
  43. GRB060319 - SDSS Pre-burst Observations
  44. GRB060313: Radio Observations
  45. GRB 060313: early afterglow NIR upper limits with REM
  46. GRB 060313: Further analysis of the Swift-BAT bright short hard burst
  47. GRB 060313: Swift/UVOT Observations
  48. GRB 060313: Refined analysis of the Swift-BAT bright short hard burst
  49. GRB 060313, SMARTS optical counterpart?
  50. GRB 060313, SMARTS optical/IR observations
  51. GRB060313: optical and near infrared observations with REM
  52. GRB060218: SARA Observations of SN2006aj
  53. GRB 060312: Refined analysis of the Swift-BAT burst
  54. GRB 060218/SN 2006aj, high resolution spectra
  55. GRB 060312: Swift XRT team refined analysis
  56. GRB060306: APO Ks-band Imaging Observations
  57. GRB 060312: ROTSE-III Optical Limits
  58. Bright short hard GRB 060303: IPN localization and Konus spectrum
  59. GRB060219: Liverpool Telescope observations
  60. GRB 060306: MAGNUM observations
  61. GRB060218: analysis of the XMM-Newton observation
  62. Swift/UVOT observations of GRB060306
  63. GRB 060306: Swift-BAT refined analysis
  64. GRB 060306: Swift-XRT team refined analysis
  65. GRB 060306: Swift detection of a bright burst
  66. GRB060218: Ep,i - Eiso correlation
  67. GRB060223b: optical limit
  68. GRB 060223b: Swift/UVOT Upper Limits
  69. GRB 060218/SN 2006aj: K-380 optical observations
  70. GRB 060218/SN 2006aj, SMARTS optical/IR observations
  71. GRB 060223B: Swift XRT possible afterglow
  72. GRB 060218/SN 2006aj: ABT observations
  73. GRB 060218/SN 2006aj: REM optical and near-infrared observations
  74. GRB 060218 : Radio upper limits from GMRT
  75. GRB 060218/SN 2006aj: RBO optical observations
  76. GRB 060204B: GETS early limit
  77. GRB 060223A:Xinglong optical limits
  78. GRB 060223B: Swift-BAT refined analysis
  79. GRB 060223a: Swift/UVOT refined analysis
  80. GRB 060223B: Swift detection of a bright burst
  81. GRB 060223: Swift-BAT refined analysis
  82. GRB 060223: Swift detection of a burst
  83. Spectral properties of GRB060218/SN2006aj
  84. GRB 060219: Swift-BAT refined analysis
  85. GRB 060218: Decline in r-band flux
  86. GRB060218: UV Detection and Light Curves
  87. GRB060219: SARA Observations
  88. GRB 060219: Swift/UVOT Upper Limits
  89. GRB 060219: Swift-XRT Team refined analysis
  90. GRB 051221B: Swift-XRT Team Refined Analysis
  91. GRB060218: Radio Afterglow Discovery
  92. GRB060219: SDSS pre-burst observations
  93. GRB 060219: Swift-BAT detection of a weak burst
  94. Oddball GRB 060218, transient or GRB?
  95. GRB060218: Swift/XRT Team preliminary analysis of the possible burst
  96. GRB 060218: Pre-burst detection of a possible host galaxy
  97. Further UVOT Observations of the Candidate Optical Afterglow for GRB 060218
  98. GRB 060211B: Swift/UVOT Upper Limits
  99. GRB060218 : SDSS pre-burst observations
  100. GRB 060218: Swift-BAT detection of a possible burst

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