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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"

18468 results found.

  1. GRB 090309: Swift/UVOT Upper Limits
  2. GRB 090309B: Fermi GBM detection
  3. GRB 090309: Enhanced Swift-XRT position
  4. GRB 090308: GROND observations
  5. GRB 090308: Gemini GMOS Observations
  6. GRB 090309: Swift detection of a burst
  7. GRB 090308: Swift/UVOT Upper Limits
  8. GRB 090307: GROND Upper Limits
  9. GRB 090306B: GROND Upper Limits
  10. GRB 090308: Swift-XRT refined analysis
  11. GRB 090308: Swift detection of a burst
  12. GRB 090306B: Possible XRT afterglow
  13. GRB 090307: Swift-XRT afterglow confirmation and analysis
  14. Swift Trigger 345551 is probably not a GRB
  15. IPN localization of short GRB 090305C
  16. GRB 090306: Swift detection of a possible burst
  17. GRB 090305: Swift/UVOT Upper Limits
  18. GRB 090305: Swift-XRT refined analysis
  19. GRB090305: GMOS-S Candidate Optical Afterglow
  20. GRB 090305: Swift detection of a short burst
  21. GRB 081211B: Nearby cluster
  22. GRB090217: XRT analysis
  23. SGR activity seen by BAT during ICSP Ionospheric Events
  24. VLA radio upper limit on GRB 090205
  25. GRB 090205: Swift/UVOT Upper Limits
  26. GRB 090205: GROND observations and photometric redshift estimate
  27. GRB 090205: VLT candidate afterglow
  28. GRB 090205: Enhanced Swift-XRT position
  29. GRB 090205: Swift detection of a burst
  30. GRB 080319B: IceCube upper limit on high-energy neutrino flux
  31. ICSP VLF observation of the signatures of SGR/AXP 1E1547.0-5408 bursts
  32. GRB090201: Swift UVOT upper limits
  33. GRB 090201: object inside the enhanced XRT error circle
  34. GRB 090201: Enhanced Swift-XRT position
  35. GRB 090201: VLT NIR observations
  36. GRB 090201: VLT afterglow candidate
  37. GRB 090201: Swift-XRT detection of the possible X-ray afterglow
  38. GRB 090201: ROTSE-III Optical Limits
  39. GRB 090126A: Swift/UVOT Upper Limits
  40. Suzaku ToO Observation of AXP 1E 1547.0-5408
  41. Konus-Wind observation of AXP/SGR 1E1547.0-5408 bursting activity
  42. GRB 090102: HST observations and host galaxy
  43. GRB 090118: no afterglow candidate
  44. GRB 090123: GROND detection
  45. GRB 090123: Swift/UVOT Observations
  46. GRB090123: Enhanced Swift-XRT position
  47. GRB 090123: Swift detection of a burst
  48. AXP 1E1547.0-5408: Fermi GBM detection of additional bursts
  49. Trigger 340734: Swift detection of a possible short burst
  50. GRB 090118: Subaru NIR Observation
  51. GRB 090118: KPNO 4m 2nd Epoch Observations
  52. GRB 090118 (BATSS): GRT Optical Observation
  53. GRB 090118: KPNO 4m Detection of Candidate Afterglow
  54. GRB090118 Swift/UVOT upper limits
  55. GRB 090118: GROND Upper Limits
  56. GRB 090118: Possible burst detection from Swift-BAT slew data
  57. GRB 090117: GROND Upper Limits
  58. GRB090117 Swift/UVOT upper limits
  59. GRB090117: Swift-XRT detection of a possible candidate afterglow
  60. GRB 090113: LOAO Detection Limits in R, I, z, Y-band
  61. GRB 090113: Swift UVOT upper limits
  62. GRB 090113: GROND Upper Limits
  63. GRB 090113: Observations from NOT
  64. GRB 090113: Enhanced Swift-XRT position
  65. GRB 090113: ROTSE-III Optical Limits
  66. GRB 090112B: Fermi GBM Detection
  67. GRB 090113: Swift detection of a burst
  68. GRB 090111, Swift-BAT refined analysis
  69. GRB 090111: Swift UVOT Upper Limits
  70. GRB 090111: Enhanced Swift-XRT position
  71. GRB 090111: Swift detection of a burst
  72. GRB 090102: WSRT Radio Observations
  73. GRB 090107B: Swift XRT afterglow confirmation
  74. GRB 090107B: Swift/UVOT Observations
  75. GRB 090107B: Swift-XRT detection of possible afterglow
  76. VLA radio upper limit on GRB 090102
  77. GRB 090102: GRT Optical Observation
  78. Swift triggered on the HMXB 1A 1118-61
  79. GRB 090102: P60 Imaging and P200 Spectroscopy
  80. GRB 090102 Observations from IAC80
  81. GRB 090102: GROND observations of the optical afterglow
  82. GRB 090102: NOT redshift
  83. GRB 090102: Enhanced Swift-XRT position
  84. GRB 090102: REM observations of a bright afterglow
  85. GRB 090102: Swift detection of a burst with an optical counterpart
  86. GRB 090102: TAROT Calern observatory optical observations
  87. GRB 081230: GROND confirmation of the afterglow
  88. GRB081230: Swift-XRT refined analysis
  89. GRB 081230 Swift/UVOT Observations
  90. GRB 081230: Enhanced Swift-XRT position
  91. GRB 081230: Swift detection of a burst
  92. GRB 081228, Swift-BAT refined analysis
  93. VLA radio detection of GRB 081221
  94. GRB 081228: Swift/UVOT Upper Limits
  95. GRB 081228: Swift-XRT Team refined analysis
  96. GRB 081228: detection by GROND
  97. GRB 081228: Enhanced Swift-XRT position
  98. GRB 081228: TAROT Calern observatory optical observations
  99. GRB 081228: Swift detection of a burst
  100. VLA radio observation of GRB 081221

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