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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"

26514 results found.

  1. Correction to Circular 4938, =H4043, an unusual high energy transient observed by HETE
  2. H4043, an unusual high-energy transient observed by HETE
  3. SGR 1900+14: bright burst detected by Konus-Wind on March 28
  4. GRB 060323 : WIDGET simultaneous optical observations
  5. GRB060218, optical observations
  6. GRB 060322: Confirmation of Swift XRT afterglow
  7. GRB 060211A: optical observation
  8. GRB 060322: IAC80 optical observations
  9. GRB 060322: Swift XRT afterglow candidate
  10. GRB060323: P60 Observations
  11. GRB 060323: Swift/UVOT Observations
  12. GRB 060323: optical afterglow confirmed
  13. GRB060323: NOT observations
  14. GRB 060323: Optical Observations
  15. GRB 060323: Tautenburg OT candidate retraction
  16. GRB 060323: Refined analysis of the Swift-BAT burst
  17. GRB 060323: optical observations at TNG
  18. GRB 060323: Swift XRT refined analysis
  19. GRB 060322: Refined analysis of the Swift-BAT burst
  20. GRB060323 - SDSS Pre-Burst Observations
  21. GRB060219: optical observation
  22. GRB060206: optical observation
  23. GRB060218: Refined photometric calibration of comparison stars
  24. GRB 060319: WHT K-band candidate afterglow
  25. GRB 060319: IAC-80 optical observations
  26. GRB060319: Swift XRT refined analysis
  27. GRB 060319: Re-analysis of TNG data
  28. GRB060319: MASTER limit
  29. GRB 060319: Swift-BAT refined analysis
  30. GRB060319 : Liverpool Telescope optical limit
  31. GRB060319: MASTER optical observation
  32. GRB060319 - SDSS Pre-burst Observations
  33. GRB 060313: early afterglow NIR upper limits with REM
  34. Konus-Wind observation of GRB 060313
  35. GRB060313: SSO 40inch Observations
  36. GRB 060313: PROMPT Observations
  37. GRB 060313: Swift/UVOT Observations
  38. GRB 060313: Swift-XRT team refined analysis
  39. GRB 060313: Refined analysis of the Swift-BAT bright short hard burst
  40. GRB 060313: Possible optical counterpart
  41. GRB 060313: Swift-BAT detection of a bright short hard burst
  42. GRB 060312: Refined analysis of the Swift-BAT burst
  43. GRB 060312: Swift XRT team refined analysis
  44. GRB060306: APO Ks-band Imaging Observations
  45. GRB 060306: SOAR Ks Observations
  46. Bright short hard GRB 060303: IPN localization and Konus spectrum
  47. GRB060219: Liverpool Telescope observations
  48. GRB060218: analysis of the XMM-Newton observation
  49. GRB 060306: Swift-BAT refined analysis
  50. GRB060218: Ep,i - Eiso correlation
  51. GRB 060223B: Swift XRT possible afterglow
  52. GRB 060218/SN 2006aj: ABT observations
  53. GRB 060218 : Radio upper limits from GMRT
  54. GRB 060218/SN 2006aj: WIRO optical observations
  55. GRB 060218/SN 2006aj: RBO optical observations
  56. GRB 060204B: GETS early limit
  57. GRB 060218: Refined analysis of the radio afterglow
  58. GRB 060223B: Swift-BAT refined analysis
  59. GRB 060218/SN 2006aj: Swift-BAT fluence and peak flux
  60. GRB 060223: Swift-BAT refined analysis
  61. GRB 060218: rebrightening
  62. Correction to GCN 4816 on GRB060218
  63. GRB060218: Optical brightening in V and R
  64. GRB 060223: Swift/UVOT Confirmation of Optical Afterglow
  65. GRB 060219: Swift-BAT refined analysis
  66. GRB 060218: rebrightening
  67. GRB 060218: emergence of the underlying SN spectrum
  68. GRB 060218: Decline in r-band flux
  69. GRB 060218: Likely an underluminous GRB
  70. GRB 060218: Optical Observations at Xinglong Obs.
  71. GRB 060219: SDSS galaxy inside XRT error circle
  72. GRB060218: UV Detection and Light Curves
  73. GRB 060219: Swift-XRT Team refined analysis
  74. GRB 051221B: Swift-XRT Team Refined Analysis
  75. GRB 060218: optical/nIR observations at La Palma
  76. GRB060219: SDSS pre-burst observations
  77. GRB060218: Swift/XRT Team preliminary analysis of the possible burst
  78. Brightening of the Optical Counterpart of the Possible GRB 060218
  79. GRB 060218: MDM Observations
  80. GRB 060218A: ROTSE-III Possible Optical Flare
  81. Preliminary refined analysis of the Swift-BAT trigger 191157
  82. Further UVOT Observations of the Candidate Optical Afterglow for GRB 060218
  83. GRB060218 : SDSS pre-burst observations
  84. GRB 060213: optical afterglow not confirmed
  85. Swift UVOT observations of GRB060213
  86. GRB 060213: optical afterglow candidate
  87. GRB060213: Swift XRT observations and possible afterglow candidate
  88. GRB 060213: pseudo-z = 3.5 +/- 0.35 from spectral parameters
  89. GRB060213: MASTER final result
  90. GRB 060211b: WIRO NIR Observations
  91. GRB060213:_MASTER_optical_observation
  92. GRB060206: Swift XRT observations of an unbroken powerlaw decay
  93. Konus-Wind observation of bright hard GRB 060213
  94. GRB 060213: IPN localization
  95. GRB 060210: Radio Observations
  96. GRB 060211a: WIRO NIR Observations
  97. GRB060211B: REM optical and NIR observations
  98. GRB 060211A: Further refined analysis of the Swift burst
  99. GRB060121: optical observations
  100. GRB060110: optical observations

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