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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"

28112 results found.

  1. SGR 1900+14: Swift-BAT detection of a bright outburst
  2. GRB 060323 : WIDGET simultaneous optical observations
  3. GRB 060323: Early optical observation at Xinglong
  4. GRB 060322: Confirmation of Swift XRT afterglow
  5. GRB060323: NOT optical observations
  6. GRB 060322: IAC80 optical observations
  7. GRB 060322: Swift XRT afterglow candidate
  8. GRB060323: P60 Observations
  9. GRB 060323: Swift/UVOT Observations
  10. GRB 060323: optical afterglow confirmed
  11. GRB060323: NOT observations
  12. GRB 060323: Optical Observations
  13. GRB 060323: Refined analysis of the Swift-BAT burst
  14. GRB 060323: optical observations at TNG
  15. GRB 060323: BVRI observations at Tautenburg, aftreglow candidate
  16. GRB 060322: Refined analysis of the Swift-BAT burst
  17. GRB060323, optical observation
  18. GRB060323 - SDSS Pre-Burst Observations
  19. GRB 060323: Swift detection of a burst with a possible optical afterglow
  20. GRB 060322: Swift-BAT detection of a 200-sec burst
  21. GRB 060218/SN 2006aj, LNA optical observation
  22. GRB060218: Refined photometric calibration of comparison stars
  23. GRB 060319: WHT K-band candidate afterglow
  24. GRB060319: Swift/UVOT upper limits
  25. GRB 060319: Swift-BAT refined analysis
  26. GRB 060319 optical observations at TNG
  27. GRB060319 : Liverpool Telescope optical limit
  28. GRB060319 - SDSS Pre-burst Observations
  29. GRB060313: Radio Observations
  30. GRB 060313: early afterglow NIR upper limits with REM
  31. GRB 060313: Further analysis of the Swift-BAT bright short hard burst
  32. GRB 060313: Swift/UVOT Observations
  33. GRB 060313: Refined analysis of the Swift-BAT bright short hard burst
  34. GRB 060313, SMARTS optical counterpart?
  35. GRB 060313, SMARTS optical/IR observations
  36. GRB060313: optical and near infrared observations with REM
  37. GRB060218: SARA Observations of SN2006aj
  38. GRB 060312: Refined analysis of the Swift-BAT burst
  39. GRB 060218/SN 2006aj, high resolution spectra
  40. GRB 060312: Swift XRT team refined analysis
  41. GRB060306: APO Ks-band Imaging Observations
  42. GRB 060312: ROTSE-III Optical Limits
  43. Bright short hard GRB 060303: IPN localization and Konus spectrum
  44. GRB060219: Liverpool Telescope observations
  45. GRB 060306: MAGNUM observations
  46. GRB060218: analysis of the XMM-Newton observation
  47. Swift/UVOT observations of GRB060306
  48. GRB 060306: Swift-BAT refined analysis
  49. GRB 060306: Swift-XRT team refined analysis
  50. GRB 060306: Swift detection of a bright burst
  51. GRB060218: Ep,i - Eiso correlation
  52. GRB060223b: optical limit
  53. GRB 060223b: Swift/UVOT Upper Limits
  54. GRB 060218/SN 2006aj: K-380 optical observations
  55. GRB 060218/SN 2006aj, SMARTS optical/IR observations
  56. GRB 060223B: Swift XRT possible afterglow
  57. GRB 060218/SN 2006aj: ABT observations
  58. GRB 060218/SN 2006aj: REM optical and near-infrared observations
  59. GRB 060218 : Radio upper limits from GMRT
  60. GRB 060218/SN 2006aj: RBO optical observations
  61. GRB 060204B: GETS early limit
  62. GRB 060223A:Xinglong optical limits
  63. GRB 060223B: Swift-BAT refined analysis
  64. GRB 060223a: Swift/UVOT refined analysis
  65. GRB 060223B: Swift detection of a bright burst
  66. GRB 060223: Swift-BAT refined analysis
  67. GRB 060223: Swift detection of a burst
  68. Spectral properties of GRB060218/SN2006aj
  69. GRB 060219: Swift-BAT refined analysis
  70. GRB 060218: Decline in r-band flux
  71. GRB060218: UV Detection and Light Curves
  72. GRB060219: SARA Observations
  73. GRB 060219: Swift/UVOT Upper Limits
  74. GRB 060219: Swift-XRT Team refined analysis
  75. GRB 051221B: Swift-XRT Team Refined Analysis
  76. GRB060218: Radio Afterglow Discovery
  77. GRB060219: SDSS pre-burst observations
  78. GRB 060219: Swift-BAT detection of a weak burst
  79. Oddball GRB 060218, transient or GRB?
  80. GRB060218: Swift/XRT Team preliminary analysis of the possible burst
  81. GRB 060218: Pre-burst detection of a possible host galaxy
  82. Further UVOT Observations of the Candidate Optical Afterglow for GRB 060218
  83. GRB 060211B: Swift/UVOT Upper Limits
  84. GRB060218 : SDSS pre-burst observations
  85. GRB 060218: Swift-BAT detection of a possible burst
  86. GRB 060213: optical afterglow not confirmed
  87. Swift UVOT observations of GRB060213
  88. GRB 060211B: Skynet Observations
  89. GRB060213: Swift XRT observations and possible afterglow candidate
  90. GRB 060213: IPN localization
  91. GRB060211B: REM optical and NIR observations
  92. GRB 060211A: Further refined analysis of the Swift burst
  93. GRB 060210: ARC NIR Detection of Afterglow and Possible Host Galaxy
  94. GRB 060211b: P60 Observations
  95. GRB 060211A: Partial refined analysis on the Swift-BAT burst
  96. GRB 050826: Optical Afterglow and Host Galaxy
  97. GRB 060210: Further refined analysis of the Swift-BAT burst
  98. GRB 060211B: Swift/BAT refined analysis
  99. GRB060210: Swift/UVOT Upper Limits
  100. GRB 060211B: Swift-XRT Team refined analysis

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