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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"

45899 results found.

  1. GRB 080905B: Photometric Redshift for the 2MASS Galaxy
  2. Swift trigger 324362 (LS I +61 303 ?)
  3. GRB080905A: Swift/UVOT Upper Limits
  4. GRB 080905B: Watcher optical detection
  5. GRB 080904: Fermi Gamma-ray Burst Monitor detection
  6. GRB 080905B: Fermi Gamma-ray Burst Monitor detection
  7. GRB 080905A: Fermi Gamma-ray Burst Monitor detection
  8. GRB 080905A: Enhanced Swift-XRT position
  9. GRB 080905A: MITSuME Akeno optical upper limits
  10. Swift Trigger 324122 is again known source Swift J1842.5-1124
  11. Swift Trigger 324116 is known source again
  12. Swift Trigger 324112 is known source Swift J1842.5-1124
  13. GRB 080906: Refined Swift/UVOT Observations
  14. GRB 080906: Swift-XRT Refined Analysis
  15. GRB 080906, Swift-BAT refined analysis
  16. GRB 080905A: optical afterglow
  17. GRB 080906: GROND observations of the optical/NIR afterglow
  18. GRB 080905B: Swift-XRT Refined Analysis
  19. GRB 080905B: Refined UVOT Analysis
  20. GRB 080905B: VLT redshift
  21. GRB 080905A: NOT and VLT observations
  22. GRB 080905B: Enhanced Swift-XRT position
  23. GRB 080905B, Swift-BAT refined analysis
  24. GRB 080905A, Swift-BAT refined analysis
  25. GRB 080906: Swift detection of a burst with optical afterglow
  26. GRB 080905A: Swift-XRT Refined Analysis
  27. GRB 080825C: Fermi GBM Spectral Analysis
  28. GRB080825C: Fermi-LAT observations
  29. GRB 080905B: Swift detection of a burst with possible optical counterpart
  30. GRB 080905: R & I-band optical observations
  31. GRB 080905: Swift detection of a probably-short burst
  32. GRB 080903: Swift/UVOT Observations
  33. GRB 080903: Swift-XRT Refined Analysis
  34. GRB 080903: Enhanced Swift-XRT position
  35. GRB 080903, Swift-BAT refined analysis
  36. GRB 080903: optical observations
  37. GRB 080903: Liverpool Telescope observations
  38. GRB 080903: Astrotel-Caucasus optical observations
  39. GRB 080903: Optical afterglow candidate
  40. GRB 080903: TAROT Calern observatory optical observations
  41. GRB 080903: ROTSE-III Optical Limits
  42. GRB 080903: Swift detection of a burst
  43. Recent VLA non-detection of SGR 0501+4516
  44. GRB 080830: Fermi Gamma-ray Burst Monitor detection
  45. SGR 0501+4516: Spin Down Rate and Inferred Dipole Magnetic Field
  46. SGR 0501+4516: preliminary results of the first XMM-Newton observation
  47. nIR observations of SGR 0501+4516
  48. INTEGRAL ToO observation of SGR0501+4516
  49. SGR 0501+4516: Confirmation of the NIR counterpart
  50. GRB080828: Swift/UVOT Upper Limits
  51. SGR 0501+4516: Detection of possible optical counterpart
  52. SGR 0501+4516: WHT observations of the possible near-infrared counterpart
  53. GRB080825B: Swift/UVOT Upper Limits
  54. GRB 080828: Swift-XRT detection of a possible X-ray afterglow
  55. Swift-BAT trigger 322590 is not a GRB
  56. VLA non-detection of SGR 0501+4516
  57. Radio Detection of SGR 0501+4516: Retraction
  58. Swift trigger 322590: BAT detection of a possible burst
  59. SGR 0501+4516: XMM-Newton monitoring schedule
  60. GRB 080828: SuperAGILE GRB Localization
  61. SGR 0501+4516: Decline in Activity
  62. SGR 0501+4516: Proximity to supernova remnant HB9
  63. Enhanced Swift-XRT position of SGR 0501+4516
  64. SGR 0501+4516: GMRT Radio Observation at 618 MHz
  65. SGR 0501+4516: Swift XRT measure of the spin period
  66. GRB080823: Fermi Gamma-ray Burst Monitor detection
  67. GRB 080824: Fermi Gamma Ray Burst Monitor detection
  68. GRB 080825B: pseudo-z= 0.83 from prompt emission spectrum
  69. Konus-Wind observation of GRB 080825B
  70. GRB080825C: GLAST Burst Monitor detection
  71. GRB 080825B: Swift-XRT team analysis
  72. SGR 0501+4516: Fermi GBM (formerly GLAST Burst Monitor) observations of three exceptionally intense outbursts
  73. Soft Gamma Repeater SGR 0501+4516: GBM Detection of multiple bursts
  74. GRB080825: Afterglow confirmation and redshift estimate
  75. Suzaku ToO Observation of SGR 0501+4516
  76. GRB 080825B - optical counterpart candidate
  77. SGR 0501+4516: radio pulsar searches with GBT and WSRT
  78. GRB 080825B: GRB Localization by SuperAGILE
  79. Konus-Wind observations of new SGR 0501+4516
  80. INTEGRAL ToO Observation of SGR0501+4516
  81. Radio Detection of SGR 0501+4516
  82. SGR 0501+4516: MDM Optical Observations
  83. GRB 080822B, Swift-BAT refined analysis
  84. SGR 0501+4516: Astrotel-Caucasus optical observations
  85. SGR 0501+4516: UKIRT detection of possible infra-red counterpart
  86. SGR 0501+4516: WSRT Radio Observations
  87. Trigger 321551: Continued Large Flaring of SGR 0501+4516
  88. GRB 080822B: MASTER optical observation
  89. New Soft Gamma Repeater 0501+4516 (GRB 080822): GLAST Burst Monitor detection
  90. SGR 0501+4516: optical observations
  91. Swift Trigger 321481: A Large Flare from SGR 0501+4516
  92. SGR 0501+4516: Swift-BAT refined analysis of the 3 discovery events
  93. Discovery of the Spin Period of the New Soft Gamma Repeater SGR 0501+4516
  94. GRB 080822B: Swift detection of a burst
  95. GRB080818B: GLAST Burst Monitor detection
  96. Third event from SGR 0501+4516
  97. GRB 080822 (SGR 0501+4516): archival optical observations
  98. New Soft Gamma Repeater 0501+4516 was GRB 080822
  99. GRB 080822: Swift detection of a short burst
  100. GLAST Burst Monitor detection of a GRB: 080816B

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