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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"

23618 results found.

  1. GRB(?)060421:MASTER optical limit
  2. GRB(?) 060421: Swift detection of a burst
  3. GRB 060418: JHKs PAIRITEL Observations of Afterglow
  4. GRB 060418: Radio Observations
  5. GRB060418: Optical Observations
  6. GRB 060418: Refined Analysis of the Swift-BAT burst
  7. GRB 060418: PROMPT Detections
  8. GRB060418 : LT optical afterglow observation
  9. GRB 060418: Swift detection of a burst with bright x-ray and optical afterglow
  10. SGR 1900+14: Swift detection of an outburst
  11. GRB 060413: Refined analysis of the Swift-BAT burst
  12. GRB 060413: Watcher UBVR observations
  13. GRB 060413: XRT refined analysis
  14. GRB 060413: Swift detection of a burst
  15. GRB060403: optical observations
  16. GRB 060403: Swift/UVOT upper limits
  17. HETE Triggers H4043 and H4044 Not Due to New Cosmic Source
  18. Konus-Wind observation of the recent SGR 1900+14 activity. Will
  19. GRB 060403: Swift detection of a burst
  20. HETE trigger H4044: RTT150 optical observations
  21. H4044, a Repeat Outburst From The Source of H4043 (="GRB060331")
  22. H4043, an unusual high-energy transient observed by HETE
  23. GRB 060322: LNA optical limit
  24. SGR 1900+14: bright burst detected by Konus-Wind on March 28
  25. SGR 1900+14: Swift-BAT detection of a cluster of outbursts
  26. SGR 1900+14: Swift-BAT detection of a bright outburst
  27. GRB 060323 : WIDGET simultaneous optical observations
  28. GRB 060322: Confirmation of Swift XRT afterglow
  29. GRB 060211A: optical observation
  30. GRB060211B: optical observation
  31. SGR 1900+14: Swift detection of renewed activity
  32. GRB060323: NOT optical observations
  33. GRB 060322: IAC80 optical observations
  34. GRB 060322: Swift XRT afterglow candidate
  35. GRB060323: P60 Observations
  36. GRB 060323: optical afterglow confirmed
  37. GRB060323: NOT observations
  38. GRB 060323: Optical Observations
  39. GRB 060323: optical observations at TNG
  40. GRB 060323: Swift XRT refined analysis
  41. GRB 060323: BVRI observations at Tautenburg, aftreglow candidate
  42. GRB 060323: Swift/XRT position
  43. GRB 060322: Refined analysis of the Swift-BAT burst
  44. GRB060323 - SDSS Pre-Burst Observations
  45. GRB 060323: Swift detection of a burst with a possible optical afterglow
  46. GRB 060322: Swift-BAT detection of a 200-sec burst
  47. GRB060219: optical observation
  48. GRB060206: optical observation
  49. GRB060218/SN2006aj: optical observations
  50. GRB 060218/SN 2006aj, LNA optical observation
  51. GRB 060319: Re-analysis of TNG data
  52. GRB 060319 optical observations at TNG
  53. GRB060319 : Liverpool Telescope optical limit
  54. GRB060319 - SDSS Pre-burst Observations
  55. GRB 060319: Swift detection of a burst
  56. GRB060313: Radio Observations
  57. GRB 060313: PROMPT Observations
  58. GRB 060313: Refined analysis of the Swift-BAT bright short hard burst
  59. GRB 060313, SMARTS optical/IR observations
  60. GRB060218: SARA Observations of SN2006aj
  61. GRB060306: APO Ks-band Imaging Observations
  62. GRB 060312: Swift detection of a burst
  63. GRB 060306: SOAR Ks Observations
  64. Bright short hard GRB 060303: IPN localization and Konus spectrum
  65. Swift/UVOT observations of GRB060306
  66. GRB 060306: PROMPT Observations
  67. GRB 060306: Swift detection of a bright burst
  68. GRB 060218: RTT150 optical observations
  69. GRB060223b: optical limit
  70. GRB060218/SN 2006aj: optical observation in V
  71. GRB200618: optical polarimetry and photometry
  72. GRB 060223B: Swift XRT possible afterglow
  73. GRB 060218/SN 2006aj: WIRO optical observations
  74. GRB 060218: Refined analysis of the radio afterglow
  75. GRB 060223B: Swift-BAT refined analysis
  76. GRB 060223: Swift XRT Team preliminary analysis
  77. GRB 060218/SN 2006aj: Swift-BAT fluence and peak flux
  78. GRB 060223B: Swift detection of a bright burst
  79. GRB 060218/SN 2006aj: optical observations
  80. GRB 060223: Keck redshift
  81. GRB 060223: Swift/UVOT Confirmation of Optical Afterglow
  82. GRB 060223: Swift detection of a burst
  83. GRB 060218: rebrightening
  84. GRB 060218: Decline in r-band flux
  85. GRB 060218: spectroscopic observations
  86. GRB 060218: Likely an underluminous GRB
  87. GRB060218: Optical Spectroscopy of GRB-SN
  88. GRB060218: UV Detection and Light Curves
  89. GRB060219: SARA Observations
  90. GRB060218: Radio Afterglow Discovery
  91. GRB 060218: optical/nIR observations at La Palma
  92. GRB060219: SDSS pre-burst observations
  93. GRB060218 : SDSS pre-burst observations
  94. GRB 060213: optical afterglow not confirmed
  95. Swift UVOT observations of GRB060213
  96. GRB 060211B: Skynet Observations
  97. GRB 060213: optical afterglow candidate
  98. GRB 060206: Confirmation of Rapid Fading at Optical Wavelengths
  99. GRB060213: MASTER final result
  100. GRB 060211b: WIRO NIR Observations

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