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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"

32769 results found.

  1. GRB 090308: Gemini GMOS Observations
  2. GRB 090308: Swift/UVOT Upper Limits
  3. GRB 090307: GROND Upper Limits
  4. GRB 090306B: GROND Upper Limits
  5. GRB 090305C: Suzaku WAM observation of the prompt emission
  6. GRB 090308: Swift-XRT refined analysis
  7. Radio observation of GRB 090201 with ATCA
  8. Radio observation of GRB 090117 with ATCA
  9. Radio observation of GRB 081226b with ATCA
  10. Radio observation of GRB 081226a with ATCA
  11. Radio observation of GRB 081007 with ATCA
  12. ATCA observation of SGR J1550-5418
  13. GRB 090308: Swift-BAT refined analysis
  14. GRB 090306B: Possible XRT afterglow
  15. GRB 090307: Swift-XRT afterglow confirmation and analysis
  16. GRB 090307: Swift-BAT refined analysis of trigger 345551
  17. Swift Trigger 345551 is probably not a GRB
  18. GRB 090305: Swift/UVOT Upper Limits
  19. GRB 090305: Swift-XRT refined analysis
  20. GRB 090305, Swift-BAT refined analysis
  21. GRB 090227A: Suzaku WAM observation of the prompt emission
  22. GRB 090305: Magellan confirmation of the optical afterglow
  23. GRB090305: GMOS-S Candidate Optical Afterglow
  24. GRB 090301A: Suzaku WAM observation of the prompt emission
  25. Konus-RF catches first GRB and SGR bursts
  26. Konus-Wind observation of bright short GRB 090227B
  27. IPN localization of short bright GRB 090227B
  28. Konus-Wind observation of GRB 090301A
  29. GRB 090301A: Swift-BAT refined analysis
  30. SGR J1550-5418
  31. GRB 081211B: Nearby cluster
  32. GRB 090217: Suzaku WAM observation of the prompt emission
  33. GRB090217: XRT analysis
  34. Konus-Wind observation of GRB 090217
  35. IPN localization of GRB 090217
  36. GRB090217: Fermi-LAT Detection
  37. SGR activity seen by BAT during ICSP Ionospheric Events
  38. Detailed lightcurves of ICSP VLF Observation of SGR/AXP 1E1547.0-5408
  39. VLA radio upper limit on GRB 090205
  40. GRB 090205: VLT optical decay
  41. GRB 090205: Swift/UVOT Upper Limits
  42. GRB 090205: VLT refined redshift
  43. GRB 090205: Swift-XRT refined analysis
  44. GRB 090205: VLT spectroscopic redshift
  45. GRB 090205: GROND observations and photometric redshift estimate
  46. GRB 090205: VLT candidate afterglow
  47. GRB 090205: Swift-BAT refined analysis
  48. GRB 080319B: IceCube upper limit on high-energy neutrino flux
  49. GRB 090131: Suzaku WAM observation of the prompt emission
  50. ICSP VLF observation of the signatures of SGR/AXP 1E1547.0-5408 bursts
  51. GRB 090126A: Swift-XRT afterglow confirmation
  52. Konus-Wind observation of GRB 090201
  53. GRB 090201: Swift-XRT refined analysis
  54. GRB090201: Swift UVOT upper limits
  55. GRB 090201: object inside the enhanced XRT error circle
  56. GRB 090201: VLT NIR observations
  57. GRB 090201: Swift-BAT refined analysis
  58. GRB 090201: VLT afterglow candidate
  59. GRB 090201: Swift-XRT detection of the possible X-ray afterglow
  60. GRB090113: MAGIC telescope GeV observation
  61. GRB 090201: ROTSE-III Optical Limits
  62. GRB 090126A: Swift/UVOT Upper Limits
  63. Konus-Wind observation of bright burst from AXP/SGR 1E1547.0-5408 on January 29
  64. GRB 090129: Swift-BAT refined analysis
  65. Suzaku ToO Observation of AXP 1E 1547.0-5408
  66. Konus-Wind observation of AXP/SGR 1E1547.0-5408 bursting activity
  67. AXP 1E1547.0-5408: RHESSI observations up to 400 keV
  68. GRB 090102: HST observations and host galaxy
  69. GRB 090126A: Swift-XRT Refined Analysis
  70. GRB 090118: no afterglow candidate
  71. GRB 090123: GROND detection
  72. 1E1547.0-5408: Swift detection of dust halo
  73. GRB 090123: Swift XRT refined analysis
  74. GRB 090123: Swift/UVOT Observations
  75. AXP 1E1547.0-5408: Suzaku WAM detections of the current activity
  76. GRB 090123: Swift-BAT refined analysis
  77. AXP 1E1547.0-5408: long bursts with INTEGRAL SPI-ACS
  78. GRB 090118: Swift XRT Observations - Confirmation of an Afterglow
  79. AXP 1E1547.0-5408: Fermi GBM detection of additional bursts
  80. AXP 1E1547.0-5408: INTEGRAL SPI-ACS confirms activity increase
  81. AXP 1E1547.0-5408: Fermi GBM observations
  82. Trigger 340734: Swift detection of a possible short burst
  83. GRB 090118: Subaru NIR Observation
  84. GRB 090118: KPNO 4m 2nd Epoch Observations
  85. GRB 090118 (BATSS): GRT Optical Observation
  86. GRB 090118: KPNO 4m Detection of Candidate Afterglow
  87. GRB 090118: Swift-XRT observations
  88. GRB090118 Swift/UVOT upper limits
  89. GRB 090118: GROND Upper Limits
  90. GRB 090117: confirmation of the X-ray afterglow
  91. GRB 090117 - Fermi GBM Observations
  92. GRB 090117: GROND Upper Limits
  93. GRB090117 Swift/UVOT upper limits
  94. GRB 090112B: Suzaku WAM observation of the prompt emission
  95. GRB 090113: LOAO Detection Limits in R, I, z, Y-band
  96. GRB 090113: Swift UVOT upper limits
  97. GRB 090113: GROND Upper Limits
  98. GRB 090113: Swift-XRT refined analysis
  99. GRB 090113: Observations from NOT
  100. GRB 090113: Swift-BAT refined analysis

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