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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"

20504 results found.

  1. GRB 060403: Swift/UVOT upper limits
  2. SGR 1900+14: BAT observations
  3. Konus-Wind observation of the recent SGR 1900+14 activity. Will
  4. GRB 060403: Swift detection of a burst
  5. HETE trigger H4044: RTT150 optical observations
  6. GRB060331: Swift/UVOT upper limits
  7. Swift XRT observations of the HETE transient H4043
  8. H4043, an unusual high-energy transient observed by HETE
  9. GRB 060322: LNA optical limit
  10. SGR 1900+14: bright burst detected by Konus-Wind on March 28
  11. SGR 1900+14: Swift-BAT detection of a cluster of outbursts
  12. GRB 060323 : WIDGET simultaneous optical observations
  13. GRB 060323: Early optical observation at Xinglong
  14. GRB 060322: Confirmation of Swift XRT afterglow
  15. SGR 1900+14: Refined Swift-BAT analysis of the renewed activity
  16. GRB060323: NOT optical observations
  17. GRB 060322: IAC80 optical observations
  18. GRB 060322: Swift XRT afterglow candidate
  19. GRB060323: P60 Observations
  20. GRB 060323: Swift/UVOT Observations
  21. GRB 060323: optical afterglow confirmed
  22. GRB060323: NOT observations
  23. GRB 060323: Optical Observations
  24. GRB 060323: optical observations at TNG
  25. GRB 060323: BVRI observations at Tautenburg, aftreglow candidate
  26. GRB060323, optical observation
  27. GRB060323 - SDSS Pre-Burst Observations
  28. GRB 060323: Swift detection of a burst with a possible optical afterglow
  29. GRB 060218/SN 2006aj, LNA optical observation
  30. GRB060218: Refined photometric calibration of comparison stars
  31. GRB 060319: WHT K-band candidate afterglow
  32. GRB060319: Swift/UVOT upper limits
  33. GRB 060319: Swift-BAT refined analysis
  34. GRB 060319 optical observations at TNG
  35. GRB060319 : Liverpool Telescope optical limit
  36. GRB060319 - SDSS Pre-burst Observations
  37. GRB 060319: Swift detection of a burst
  38. GRB060313: Radio Observations
  39. GRB 060313: early afterglow NIR upper limits with REM
  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, SMARTS optical counterpart?
  44. GRB 060313, SMARTS optical/IR observations
  45. GRB060313: optical and near infrared observations with REM
  46. GRB060218: SARA Observations of SN2006aj
  47. GRB 060218/SN 2006aj, high resolution spectra
  48. GRB 060312: Swift XRT team refined analysis
  49. GRB060306: APO Ks-band Imaging Observations
  50. GRB 060312: ROTSE-III Optical Limits
  51. Bright short hard GRB 060303: IPN localization and Konus spectrum
  52. GRB 060306: MAGNUM observations
  53. GRB060218: analysis of the XMM-Newton observation
  54. Swift/UVOT observations of GRB060306
  55. GRB 060306: Swift-XRT team refined analysis
  56. GRB 060306: Swift detection of a bright burst
  57. GRB060223b: optical limit
  58. GRB 060223b: Swift/UVOT Upper Limits
  59. GRB 060218/SN 2006aj: K-380 optical observations
  60. GRB 060218/SN 2006aj, SMARTS optical/IR observations
  61. GRB 060223B: Swift XRT possible afterglow
  62. GRB 060218/SN 2006aj: REM optical and near-infrared observations
  63. GRB 060218 : Radio upper limits from GMRT
  64. GRB 060218/SN 2006aj: RBO optical observations
  65. GRB 060223A:Xinglong optical limits
  66. GRB 060223a: Swift/UVOT refined analysis
  67. GRB 060223B: Swift detection of a bright burst
  68. GRB 060223: Swift-BAT refined analysis
  69. GRB 060218: rebrightening
  70. GRB 060219: Swift-BAT refined analysis
  71. GRB 060218: Decline in r-band flux
  72. GRB060219: SARA Observations
  73. GRB 060219: Swift/UVOT Upper Limits
  74. GRB 051221B: Swift-XRT Team Refined Analysis
  75. GRB060218: Radio Afterglow Discovery
  76. GRB060219: SDSS pre-burst observations
  77. GRB 060219: Swift-BAT detection of a weak burst
  78. Oddball GRB 060218, transient or GRB?
  79. GRB 060218: Pre-burst detection of a possible host galaxy
  80. GRB 060211B: Swift/UVOT Upper Limits
  81. GRB060218 : SDSS pre-burst observations
  82. GRB 060213: optical afterglow not confirmed
  83. Swift UVOT observations of GRB060213
  84. GRB 060211B: Skynet Observations
  85. GRB060213: Swift XRT observations and possible afterglow candidate
  86. Konus-Wind observation of bright hard GRB 060213
  87. GRB 060213: IPN localization
  88. GRB060211B: REM optical and NIR observations
  89. GRB 060210: ARC NIR Detection of Afterglow and Possible Host Galaxy
  90. GRB 060211b: P60 Observations
  91. GRB 060211B: Swift/BAT refined analysis
  92. GRB060210: Swift/UVOT Upper Limits
  93. GRB 060210: Optical Observations
  94. GRB 060211: Swift detection of a long burst
  95. GRB 060210: Swift detection of a burst
  96. GRB060210: Optical afterglow
  97. GRB 060209 : TAROT optical observation
  98. GRB 060203: Swift/UVOT upper limits
  99. GRB 060121 : WIDGET Pre-trigger limit
  100. GRB060204a: Swift XRT Source is not GRB Afterglow

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