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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"

26517 results found.

  1. GRB 060403: Refined analysis of the Swift-BAT burst
  2. Konus-Wind observation of the recent SGR 1900+14 activity. Will
  3. GRB 060403: Swift detection of a burst
  4. Correction to Circular 4938, =H4043, an unusual high energy transient observed by HETE
  5. H4043, an unusual high-energy transient observed by HETE
  6. SGR 1900+14: bright burst detected by Konus-Wind on March 28
  7. GRB 060323 : WIDGET simultaneous optical observations
  8. GRB060218, optical observations
  9. GRB 060322: Confirmation of Swift XRT afterglow
  10. GRB 060211A: optical observation
  11. GRB 060322: IAC80 optical observations
  12. GRB 060322: Swift XRT afterglow candidate
  13. GRB060323: P60 Observations
  14. GRB 060323: Swift/UVOT Observations
  15. GRB 060323: optical afterglow confirmed
  16. GRB060323: NOT observations
  17. GRB 060323: Optical Observations
  18. GRB 060323: Tautenburg OT candidate retraction
  19. GRB 060323: Refined analysis of the Swift-BAT burst
  20. GRB 060323: optical observations at TNG
  21. GRB 060323: Swift XRT refined analysis
  22. GRB 060322: Refined analysis of the Swift-BAT burst
  23. GRB060323 - SDSS Pre-Burst Observations
  24. GRB060219: optical observation
  25. GRB060206: optical observation
  26. GRB060218: Refined photometric calibration of comparison stars
  27. GRB 060319: WHT K-band candidate afterglow
  28. GRB 060319: IAC-80 optical observations
  29. GRB060319: Swift XRT refined analysis
  30. GRB 060319: Re-analysis of TNG data
  31. GRB060319: MASTER limit
  32. GRB 060319: Swift-BAT refined analysis
  33. GRB060319 : Liverpool Telescope optical limit
  34. GRB060319: MASTER optical observation
  35. GRB060319 - SDSS Pre-burst Observations
  36. GRB 060313: early afterglow NIR upper limits with REM
  37. Konus-Wind observation of GRB 060313
  38. GRB060313: SSO 40inch Observations
  39. GRB 060313: PROMPT Observations
  40. GRB 060313: Swift/UVOT Observations
  41. GRB 060313: Swift-XRT team refined analysis
  42. GRB 060313: Refined analysis of the Swift-BAT bright short hard burst
  43. GRB 060313: Possible optical counterpart
  44. GRB 060313: Swift-BAT detection of a bright short hard burst
  45. GRB 060312: Refined analysis of the Swift-BAT burst
  46. GRB 060312: Swift XRT team refined analysis
  47. GRB060306: APO Ks-band Imaging Observations
  48. GRB 060306: SOAR Ks Observations
  49. Bright short hard GRB 060303: IPN localization and Konus spectrum
  50. GRB060219: Liverpool Telescope observations
  51. GRB060218: analysis of the XMM-Newton observation
  52. GRB 060306: Swift-BAT refined analysis
  53. GRB060218: Ep,i - Eiso correlation
  54. GRB 060223B: Swift XRT possible afterglow
  55. GRB 060218/SN 2006aj: ABT observations
  56. GRB 060218 : Radio upper limits from GMRT
  57. GRB 060218/SN 2006aj: WIRO optical observations
  58. GRB 060218/SN 2006aj: RBO optical observations
  59. GRB 060204B: GETS early limit
  60. GRB 060218: Refined analysis of the radio afterglow
  61. GRB 060223B: Swift-BAT refined analysis
  62. GRB 060218/SN 2006aj: Swift-BAT fluence and peak flux
  63. GRB 060223: Swift-BAT refined analysis
  64. GRB 060218: rebrightening
  65. Correction to GCN 4816 on GRB060218
  66. GRB060218: Optical brightening in V and R
  67. GRB 060223: Swift/UVOT Confirmation of Optical Afterglow
  68. GRB 060219: Swift-BAT refined analysis
  69. GRB 060218: rebrightening
  70. GRB 060218: emergence of the underlying SN spectrum
  71. GRB 060218: Decline in r-band flux
  72. GRB 060218: Likely an underluminous GRB
  73. GRB 060218: Optical Observations at Xinglong Obs.
  74. GRB 060219: SDSS galaxy inside XRT error circle
  75. GRB060218: UV Detection and Light Curves
  76. GRB 060219: Swift-XRT Team refined analysis
  77. GRB 051221B: Swift-XRT Team Refined Analysis
  78. GRB 060218: optical/nIR observations at La Palma
  79. GRB060219: SDSS pre-burst observations
  80. GRB060218: Swift/XRT Team preliminary analysis of the possible burst
  81. Brightening of the Optical Counterpart of the Possible GRB 060218
  82. GRB 060218: MDM Observations
  83. GRB 060218A: ROTSE-III Possible Optical Flare
  84. Preliminary refined analysis of the Swift-BAT trigger 191157
  85. Further UVOT Observations of the Candidate Optical Afterglow for GRB 060218
  86. GRB060218 : SDSS pre-burst observations
  87. GRB 060213: optical afterglow not confirmed
  88. Swift UVOT observations of GRB060213
  89. GRB 060213: optical afterglow candidate
  90. GRB060213: Swift XRT observations and possible afterglow candidate
  91. GRB 060213: pseudo-z = 3.5 +/- 0.35 from spectral parameters
  92. GRB060213: MASTER final result
  93. GRB 060211b: WIRO NIR Observations
  94. GRB060213:_MASTER_optical_observation
  95. GRB060206: Swift XRT observations of an unbroken powerlaw decay
  96. Konus-Wind observation of bright hard GRB 060213
  97. GRB 060213: IPN localization
  98. GRB 060210: Radio Observations
  99. GRB 060211a: WIRO NIR Observations
  100. GRB060211B: REM optical and NIR observations

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