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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"

45900 results found.

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

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