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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"

28115 results found.

  1. GRB 090309: Swift detection of a burst
  2. GRB 090308B: Fermi GBM detection
  3. GRB 090308: Swift/UVOT Upper Limits
  4. GRB 090307B: Fermi GBM detection
  5. GRB 090306C: Fermi GBM detection
  6. GRB 090307: GROND Upper Limits
  7. GRB 090306B: GROND Upper Limits
  8. GRB 090308: Swift-XRT refined analysis
  9. Radio observation of GRB 090201 with ATCA
  10. Radio observation of GRB 090117 with ATCA
  11. Radio observation of GRB 081226b with ATCA
  12. Radio observation of GRB 081226a with ATCA
  13. Radio observation of GRB 081007 with ATCA
  14. GRB 090308: Swift-BAT refined analysis
  15. GRB 090308: Swift detection of a burst
  16. GRB 090306B: Possible XRT afterglow
  17. GRB 090307: Swift-XRT afterglow confirmation and analysis
  18. GRB 090307: Swift-BAT refined analysis of trigger 345551
  19. GRB 090306B: Burst detection from Swift-BAT slew data
  20. Swift Trigger 345551 is probably not a GRB
  21. IPN localization of short GRB 090305C
  22. GRB 090306: Swift detection of a possible burst
  23. GRB 090305: Swift/UVOT Upper Limits
  24. GRB 090305: Swift-XRT refined analysis
  25. GRB 090305, Swift-BAT refined analysis
  26. GRB 090227A: Suzaku WAM observation of the prompt emission
  27. GRB090305: GMOS-S Candidate Optical Afterglow
  28. GRB 090305: Swift detection of a short burst
  29. GRB 090303: Fermi GBM detection
  30. GRB 090304: Fermi GBM detection
  31. GRB 090301A: Suzaku WAM observation of the prompt emission
  32. GRB 090228B: Fermi GBM detection
  33. GRB 090301A: Swift-BAT refined analysis
  34. GRB 090301B: Fermi GBM detection
  35. GRB 090227B: Fermi GBM detection
  36. Swift_BAT_Lightcurve Notice for Trigger Number 344565 is not valid
  37. GRB 090228: Fermi GBM detection
  38. GRB 090227: Fermi GBM detection
  39. GRB 090206: Fermi GBM detection
  40. SGR J1550-5418
  41. GRB 081211B: Nearby cluster
  42. GRB 090222: Fermi GBM detection
  43. GRB 090219: Fermi GBM detection
  44. Swift Trigger 343319 is not a GRB
  45. GRB 090217: Suzaku WAM observation of the prompt emission
  46. GRB090217: XRT analysis
  47. GRB 090213: Fermi GBM detection
  48. GRB 090217: Fermi GBM detection
  49. SGR activity seen by BAT during ICSP Ionospheric Events
  50. GRB 090207 - Fermi GBM Observations
  51. GRB 090129: Fermi GBM detection
  52. VLA radio upper limit on GRB 090205
  53. GRB 090205: Swift/UVOT Upper Limits
  54. GRB 090205: Swift-XRT refined analysis
  55. GRB 090205: GROND observations and photometric redshift estimate
  56. GRB 090205: VLT candidate afterglow
  57. GRB 090205: Swift-BAT refined analysis
  58. GRB 090205: Enhanced Swift-XRT position
  59. GRB 090205: Swift detection of a burst
  60. GRB 080319B: IceCube upper limit on high-energy neutrino flux
  61. GRB 090131: Suzaku WAM observation of the prompt emission
  62. GRB 090202: Fermi GBM detection
  63. GRB 090131: Fermi GBM detection
  64. GRB 090201: Swift-XRT refined analysis
  65. GRB090201: Swift UVOT upper limits
  66. GRB 090201: object inside the enhanced XRT error circle
  67. GRB 090201: Enhanced Swift-XRT position
  68. GRB 090201: VLT NIR observations
  69. GRB 090201: Swift-BAT refined analysis
  70. GRB 090201: VLT afterglow candidate
  71. GRB 090201: Swift-XRT detection of the possible X-ray afterglow
  72. GRB090113: MAGIC telescope GeV observation
  73. GRB 090201: ROTSE-III Optical Limits
  74. GRB 090126A: Swift/UVOT Upper Limits
  75. Konus-Wind observation of bright burst from AXP/SGR 1E1547.0-5408 on January 29
  76. GRB 090129: Swift-BAT refined analysis
  77. GRB 090129: Swift detection of a burst
  78. Suzaku ToO Observation of AXP 1E 1547.0-5408
  79. Konus-Wind observation of AXP/SGR 1E1547.0-5408 bursting activity
  80. GRB 090102: HST observations and host galaxy
  81. GRB 090126C: Fermi GBM detection
  82. GRB 090126A: Swift-XRT Refined Analysis
  83. GRB 090126B: Fermi GBM detection
  84. GRB 090126: SuperAGILE Localization of a Long GRB
  85. GRB 090118: no afterglow candidate
  86. GRB 090123: GROND detection
  87. 1E1547.0-5408: Swift detection of dust halo
  88. GRB 090123: Swift XRT refined analysis
  89. GRB 090123: Swift/UVOT Observations
  90. AXP 1E1547.0-5408: Suzaku WAM detections of the current activity
  91. GRB 090123: Swift-BAT refined analysis
  92. GRB090123: Enhanced Swift-XRT position
  93. GRB 090123: Swift detection of a burst
  94. AXP 1E1547.0-5408: long bursts with INTEGRAL SPI-ACS
  95. AXP 1E1547.0-5408: Fermi GBM detection of additional bursts
  96. GRB 090117C: Suzaku WAM observation of the prompt emission
  97. Trigger 340734: Swift detection of a possible short burst
  98. GRB 090118: Subaru NIR Observation
  99. GRB 090118: KPNO 4m 2nd Epoch Observations
  100. GRB 090118 (BATSS): GRT Optical Observation

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