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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"

29152 results found.

  1. IPN localization of GRB 090217
  2. GRB 090213: Fermi GBM detection
  3. GRB090217: Fermi-LAT Detection
  4. GRB 090217: Fermi GBM detection
  5. SGR activity seen by BAT during ICSP Ionospheric Events
  6. Detailed lightcurves of ICSP VLF Observation of SGR/AXP 1E1547.0-5408
  7. GRB 090207 - Fermi GBM Observations
  8. Fermi Gamma-ray Burst Monitor trigger 255729682 is not a GRB
  9. GRB 090129: Fermi GBM detection
  10. Fermi Gamma-ray Burst Monitor trigger 255541748 cannot be classified
  11. GRB 090205: Swift/UVOT Upper Limits
  12. GRB 090205: GROND observations and photometric redshift estimate
  13. GRB 090205: Swift-BAT refined analysis
  14. GRB 090205: Swift detection of a burst
  15. GRB 090126A: Swift-XRT afterglow confirmation
  16. Fermi Gamma-ray Burst Monitor trigger 255342766 is not a GRB
  17. Konus-Wind observation of GRB 090201
  18. GRB 090202: Fermi GBM detection
  19. GRB 090131: Fermi GBM detection
  20. GRB 090201: Swift-XRT refined analysis
  21. GRB090201: Swift UVOT upper limits
  22. GRB 090201: Swift-BAT refined analysis
  23. GRB 090201: Swift-XRT detection of the possible X-ray afterglow
  24. GRB 090201: ROTSE-III Optical Limits
  25. GRB 090201: Swift detection of a burst
  26. Konus-Wind observation of bright burst from AXP/SGR 1E1547.0-5408 on January 29
  27. GRB 090129: Swift-BAT refined analysis
  28. GRB 090129: Swift detection of a burst
  29. Konus-Wind observation of AXP/SGR 1E1547.0-5408 bursting activity
  30. GRB 090126C: Fermi GBM detection
  31. GRB 090126A: Swift-XRT Refined Analysis
  32. GRB 090126B: Fermi GBM detection
  33. GRB 090123: GROND detection
  34. GRB 090123: Swift XRT refined analysis
  35. GRB 090123: Swift/UVOT Observations
  36. AXP 1E1547.0-5408: Suzaku WAM detections of the current activity
  37. GRB 090123: Swift-BAT refined analysis
  38. GRB 090123: Swift detection of a burst
  39. Swift-BAT trigger 340734 is not a GRB
  40. AXP 1E1547.0-5408: Fermi GBM detection of additional bursts
  41. AXP 1E1547.0-5408: INTEGRAL SPI-ACS confirms activity increase
  42. AXP 1E1547.0-5408: Fermi GBM observations
  43. Trigger 340734: Swift detection of a possible short burst
  44. AXP 1E1547.0-5408 activity with SGR bursts
  45. GRB 090118 (BATSS): GRT Optical Observation
  46. GRB 090118: GROND Upper Limits
  47. GRB 090117B : Fermi GBM detection
  48. GRB 090117C - Fermi GRB Detection
  49. GRB 090117 - Fermi GBM Observations
  50. GRB 090117: GROND Upper Limits
  51. GRB090102: MAGIC telescope GeV observation
  52. GRB 090113: LOAO Detection Limits in R, I, z, Y-band
  53. GRB 090113: Swift UVOT upper limits
  54. GRB 090113: GROND Upper Limits
  55. GRB 090113: Swift-XRT refined analysis
  56. GRB 090113: Swift-BAT refined analysis
  57. GRB 090113: ROTSE-III Optical Limits
  58. GRB090113: XRT position
  59. GRB 090112B: Fermi GBM Detection
  60. GRB 090113: Swift detection of a burst
  61. GRB 090112: Fermi GBM detection
  62. GRB 090109: Fermi GBM detection
  63. GRB 090108B: Fermi GBM detection
  64. GRB 090111, Swift-BAT refined analysis
  65. GRB 090111: Swift UVOT Upper Limits
  66. GRB 090108: Fermi GBM Detection
  67. GRB 090111: Swift-XRT refined analysis
  68. GRB 090111: Swift detection of a burst
  69. GRB090107B: Fermi GBM Detection
  70. GRB 090107B: Swift XRT afterglow confirmation
  71. GRB 090107B: Swift/UVOT Observations
  72. GRB 090107B: Swift-XRT detection of possible afterglow
  73. GRB 090107B: ROTSE-III Optical Limits
  74. Fermi/GBM detection of GRB 081226A
  75. Fermi/GBM detection of GRB 081225
  76. GRB 090107: Swift-BAT refined analysis
  77. GRB 090107: Swift detection of a burst
  78. GRB 081231: Fermi GBM Detection
  79. GRB 090102: GRT Optical Observation
  80. Swift triggered on the HMXB 1A 1118-61
  81. Konus-Wind observation of GRB 090102
  82. GRB 081229: Fermi GBM detection
  83. Swift UVOT observations of GRB 090102
  84. GRB 090102: Swift-BAT refined analysis
  85. GRB 090102: Swift XRT refined analysis
  86. GRB 090102: TAROT Calern observatory optical light curve
  87. GRB 090102: Swift detection of a burst with an optical counterpart
  88. GRB 090102: TAROT Calern observatory optical observations
  89. GRB 081230: GROND confirmation of the afterglow
  90. GRB 081230, Swift-BAT refined analysis
  91. GRB 081230 Swift/UVOT Observations
  92. GRB 081230: Swift/UVOT Detection of an Optical Afterglow
  93. GRB 081230: ROTSE-III Detection of Optical Counterpart
  94. GRB 081230: Swift detection of a burst
  95. GRB 081228: GROND confirmation of the optical/NIR afterglow
  96. GRB 081226B: Fermi GBM observation
  97. GRB 081226C: Fermi GBM detection
  98. GRB 081228, Swift-BAT refined analysis
  99. GRB 081228: Swift/UVOT Upper Limits
  100. GRB 081228: Swift-XRT Team refined analysis

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