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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"

20521 results found.

  1. GRB 060424: Refined analysis of the Swift-BAT burst
  2. GRB060421: Swift/UVOT observations
  3. GRB(?) 060421: Swift detection of a burst
  4. GRB 060418: Radio Observations
  5. GRB060418, BVRcIc field calibration
  6. GRB060418: Swift/UVOT Observations
  7. GRB060418: Swift XRT Team Refined Analysis
  8. GRB060418 : LT optical afterglow observation
  9. GRB 060418: REM candidate afterglow
  10. GRB 060418: Swift detection of a burst with bright x-ray and optical afterglow
  11. GRB060413: Swift/UVOT upper limits
  12. GRB 060413: REM NIR Observations
  13. GRB 060413: Watcher UBVR observations
  14. GRB 060413: XRT refined analysis
  15. GRB 060403: MITSuME optical observation
  16. GRB060403: Optical Limit
  17. GRB060403: XRT refined analysis
  18. GRB 060403: Swift/UVOT upper limits
  19. SGR 1900+14: BAT observations
  20. Konus-Wind observation of the recent SGR 1900+14 activity. Will
  21. GRB 060403: Swift detection of a burst
  22. HETE trigger H4044: RTT150 optical observations
  23. GRB060331: Swift/UVOT upper limits
  24. Swift XRT observations of the HETE transient H4043
  25. H4043, an unusual high-energy transient observed by HETE
  26. GRB 060322: LNA optical limit
  27. SGR 1900+14: bright burst detected by Konus-Wind on March 28
  28. SGR 1900+14: Swift-BAT detection of a cluster of outbursts
  29. GRB 060323 : WIDGET simultaneous optical observations
  30. GRB 060323: Early optical observation at Xinglong
  31. GRB 060322: Confirmation of Swift XRT afterglow
  32. SGR 1900+14: Refined Swift-BAT analysis of the renewed activity
  33. GRB060323: NOT optical observations
  34. GRB 060322: IAC80 optical observations
  35. GRB 060322: Swift XRT afterglow candidate
  36. GRB060323: P60 Observations
  37. GRB 060323: Swift/UVOT Observations
  38. GRB 060323: optical afterglow confirmed
  39. GRB060323: NOT observations
  40. GRB 060323: Optical Observations
  41. GRB 060323: optical observations at TNG
  42. GRB 060323: BVRI observations at Tautenburg, aftreglow candidate
  43. GRB060323, optical observation
  44. GRB060323 - SDSS Pre-Burst Observations
  45. GRB 060323: Swift detection of a burst with a possible optical afterglow
  46. GRB 060218/SN 2006aj, LNA optical observation
  47. GRB060218: Refined photometric calibration of comparison stars
  48. GRB 060319: WHT K-band candidate afterglow
  49. GRB060319: Swift/UVOT upper limits
  50. GRB 060319: Swift-BAT refined analysis
  51. GRB 060319 optical observations at TNG
  52. GRB060319 : Liverpool Telescope optical limit
  53. GRB060319 - SDSS Pre-burst Observations
  54. GRB 060319: Swift detection of a burst
  55. GRB060313: Radio Observations
  56. GRB 060313: early afterglow NIR upper limits with REM
  57. GRB 060313: Swift/UVOT Observations
  58. GRB 060313: Swift-XRT team refined analysis
  59. GRB 060313: Refined analysis of the Swift-BAT bright short hard burst
  60. GRB 060313, SMARTS optical counterpart?
  61. GRB 060313, SMARTS optical/IR observations
  62. GRB060313: optical and near infrared observations with REM
  63. GRB060218: SARA Observations of SN2006aj
  64. GRB 060218/SN 2006aj, high resolution spectra
  65. GRB 060312: Swift XRT team refined analysis
  66. GRB060306: APO Ks-band Imaging Observations
  67. GRB 060312: ROTSE-III Optical Limits
  68. Bright short hard GRB 060303: IPN localization and Konus spectrum
  69. GRB 060306: MAGNUM observations
  70. GRB060218: analysis of the XMM-Newton observation
  71. Swift/UVOT observations of GRB060306
  72. GRB 060306: Swift-XRT team refined analysis
  73. GRB 060306: Swift detection of a bright burst
  74. GRB060223b: optical limit
  75. GRB 060223b: Swift/UVOT Upper Limits
  76. GRB 060218/SN 2006aj: K-380 optical observations
  77. GRB 060218/SN 2006aj, SMARTS optical/IR observations
  78. GRB 060223B: Swift XRT possible afterglow
  79. GRB 060218/SN 2006aj: REM optical and near-infrared observations
  80. GRB 060218 : Radio upper limits from GMRT
  81. GRB 060218/SN 2006aj: RBO optical observations
  82. GRB 060223A:Xinglong optical limits
  83. GRB 060223a: Swift/UVOT refined analysis
  84. GRB 060223B: Swift detection of a bright burst
  85. GRB 060223: Swift-BAT refined analysis
  86. GRB 060218: rebrightening
  87. GRB 060219: Swift-BAT refined analysis
  88. GRB 060218: Decline in r-band flux
  89. GRB060219: SARA Observations
  90. GRB 060219: Swift/UVOT Upper Limits
  91. GRB 051221B: Swift-XRT Team Refined Analysis
  92. GRB060218: Radio Afterglow Discovery
  93. GRB060219: SDSS pre-burst observations
  94. GRB 060219: Swift-BAT detection of a weak burst
  95. Oddball GRB 060218, transient or GRB?
  96. GRB 060218: Pre-burst detection of a possible host galaxy
  97. GRB 060211B: Swift/UVOT Upper Limits
  98. GRB060218 : SDSS pre-burst observations
  99. GRB 060213: optical afterglow not confirmed
  100. Swift UVOT observations of GRB060213

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