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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"

28232 results found.

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

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