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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"

32770 results found.

  1. GRB 080916C: Fermi LAT observation
  2. GRB 080916A: Swift XRT refined analysis
  3. GRB 080916A, Swift-BAT refined analysis
  4. GRB 080916: REM detection of the NIR afterglow
  5. GRB 080916: REM candidate afterglow
  6. GRB 080915B, Swift-BAT refined analysis
  7. GRB 080915: REM NIR early observations
  8. GRB 080915: Swift/UVOT Upper Limits
  9. GRB 080915: Swift-XRT afterglow detection and analysis
  10. GRB 080915, Swift-BAT refined analysis
  11. SGR 0501+4516 : P200 i-band observations
  12. GRB 080915: ROTSE-III Optical Limits
  13. GRB 080913: Swift-XRT refined analysis
  14. GRB 080913: VLT/FORS spectrum
  15. GRB080913: Swift/UVOT Upper Limits
  16. GRB 080913: GROND photo-z
  17. GRB 080913, Swift-BAT refined analysis
  18. GRB 080913: VLT/FORS2 observations
  19. GRB 080913: REM NIR early observations
  20. GRB 080913: GROND observation of a high-z optical/NIR afterglow candidate
  21. GRB 080906: Watcher observations
  22. Swift-BAT/-XRT refined analysis on trigger 324362 (LS I +61 303)
  23. SGR J0501+4516: radio pulsar searches with GBT and WSRT
  24. Swift trigger 324362 (LS I +61 303 ?): XRT
  25. GRB080905A: Swift/UVOT Upper Limits
  26. GRB 080905B: Watcher optical detection
  27. GRB 080905B: Fermi Gamma-ray Burst Monitor detection
  28. GRB 080905A: Fermi Gamma-ray Burst Monitor detection
  29. GRB 080905A: Enhanced Swift-XRT position
  30. GRB 080905A: MITSuME Akeno optical upper limits
  31. Swift Trigger 324122 is again known source Swift J1842.5-1124
  32. Swift Trigger 324116 is known source again
  33. GRB 080906: Swift-XRT Refined Analysis
  34. GRB 080906, Swift-BAT refined analysis
  35. GRB 080905A: optical afterglow
  36. GRB 080906: GROND observations of the optical/NIR afterglow
  37. GRB 080905B: Swift-XRT Refined Analysis
  38. GRB 080905B: VLT redshift
  39. GRB 080905A: NOT and VLT observations
  40. GRB 080905B, Swift-BAT refined analysis
  41. GRB 080905A, Swift-BAT refined analysis
  42. GRB 080905A: Swift-XRT Refined Analysis
  43. GRB 080825C: Fermi GBM Spectral Analysis
  44. GRB080825C: Fermi-LAT observations
  45. GRB 080903: Swift/UVOT Observations
  46. GRB 080903: Swift-XRT Refined Analysis
  47. GRB 080903, Swift-BAT refined analysis
  48. GRB 080903: optical observations
  49. GRB 080903: Liverpool Telescope observations
  50. GRB 080903: Astrotel-Caucasus optical observations
  51. GRB 080903: Optical afterglow candidate
  52. GRB 080903: ROTSE-III Optical Limits
  53. Recent VLA non-detection of SGR 0501+4516
  54. SGR 0501+4516: Spin Down Rate and Inferred Dipole Magnetic Field
  55. SGR 0501+4516: preliminary results of the first XMM-Newton observation
  56. nIR observations of SGR 0501+4516
  57. INTEGRAL ToO observation of SGR0501+4516
  58. SGR 0501+4516: Confirmation of the NIR counterpart
  59. GRB080828: Swift/UVOT Upper Limits
  60. SGR 0501+4516: Detection of possible optical counterpart
  61. SGR 0501+4516: WHT observations of the possible near-infrared counterpart
  62. GRB080825B: Swift/UVOT Upper Limits
  63. GRB 080828: Swift-XRT detection of a possible X-ray afterglow
  64. Swift-BAT trigger 322590 is not a GRB
  65. VLA non-detection of SGR 0501+4516
  66. Radio Detection of SGR 0501+4516: Retraction
  67. SGR 0501+4516: Decline in Activity
  68. SGR 0501+4516: Proximity to supernova remnant HB9
  69. Enhanced Swift-XRT position of SGR 0501+4516
  70. SGR 0501+4516: GMRT Radio Observation at 618 MHz
  71. GRB 080825B: pseudo-z= 0.83 from prompt emission spectrum
  72. Konus-Wind observation of GRB 080825B
  73. GRB 080825B: Swift-XRT team analysis
  74. SGR 0501+4516: Fermi GBM (formerly GLAST Burst Monitor) observations of three exceptionally intense outbursts
  75. Soft Gamma Repeater SGR 0501+4516: GBM Detection of multiple bursts
  76. GRB080825: Afterglow confirmation and redshift estimate
  77. Suzaku ToO Observation of SGR 0501+4516
  78. GRB 080825B - optical counterpart candidate
  79. SGR 0501+4516: radio pulsar searches with GBT and WSRT
  80. Konus-Wind observations of new SGR 0501+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. GRB 080822 (SGR 0501+4516): archival optical observations
  96. New Soft Gamma Repeater 0501+4516 was GRB 080822
  97. GRB080810 - optical observations
  98. GRB080810: optical observations
  99. Radio detection of GRB 080810 with the VLA
  100. GRB 080810: RTT150 optical observations

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