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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"

38618 results found.

  1. GRB 090715B: VLA radio detection
  2. GRB 090720 Source found in ground processing of Swift-BAT data
  3. GRB 090717B: Fermi GBM detection
  4. GRB 090717: Fermi GBM detection
  5. GRB 090719: Fermi GBM detection
  6. GRB 090718B: Fermi GBM detection
  7. GRB 090718: Fermi GBM detection
  8. GRB 090720: Fermi GBM detection
  9. GRB 090715B: further NOT optical observations
  10. GRB 090715A: Suzaku WAM observation of the prompt emission
  11. GRB 090715A: VLA observations
  12. Konus-Wind observations of short/hard GRB 090715A
  13. Konus-Wind and Konus-RF observations of GRB 090715B
  14. GRB 090715B: Swift/UVOT followup observations
  15. GRB 090715B: break in the optical afterglow decay
  16. GRB 090715B: Enhanced Swift-XRT position
  17. GRB 090715B: Observation of the optical afterglow
  18. GRB 090715B: Swift XRT Refined Analysis
  19. GRB090715B: WHT redshift
  20. GRB 090715B: NOT optical observations
  21. Swift problem fixed
  22. GRB 090715B: Swift detection of a burst with a possible optical counterpart
  23. GRB 090715A: ROTSE-III Optical Limits
  24. GRB 090715: Swift detection of a short hard burst
  25. Swift satellite anomaly
  26. GRB090713 optical limit by "Pi of the Sky"
  27. GRB 090712: Fermi GBM observation
  28. GRB 090713: Fermi GBM detection
  29. GRB 090712: Swift detection of a burst
  30. GRB 090709A: Xinglong TNT optical upper limit
  31. VLA radio observations of GRB 090709A
  32. GRB 090621B: MTM-500 optical observations
  33. GRB 090709A: deep optical observation with the 10.4m GTC
  34. GRB090709A : WSRT Radio observation
  35. GRB 090709A: Suzaku WAM observation of the prompt emission
  36. GRB 090709A: Swift UVOT upper limits
  37. GRB 090709A: WHT LIRIS observations
  38. GRB 090709B: Fermi GBM detection
  39. GRB 090709A: confirmation of the periodicity in the SPI-ACS data
  40. GRB 090709A: evidence for a very red afterglow at low z
  41. Konus-Wind and Konus-RF observations of GRB 090709A
  42. GRB 090709A: P60 Observations
  43. GRB 090709A: Quasiperiodic variations in the BAT light curve
  44. GRB 090709A: NOT optical observations
  45. GRB 090709A: RAPTOR Limits During Gamma-Ray Emission
  46. GRB 090709A: Swift XRT Refined Analysis
  47. GRB 090709A: Wyoming Infrared Observatory NIR upper limits
  48. GRB 090709A, RIMOTS optical upper limits
  49. GRB 090709A: Enhanced Swift-XRT position
  50. GRB 090709A - PAIRITEL Discovery of a Red Afterglow
  51. GRB 090709A: Subaru NIR observation
  52. GRB 090709B: Swift detection of a burst
  53. GRB 090709 : planned Suzaku-ToO observation
  54. GRB 090708 : Fermi GBM detection
  55. GRB 090709: Faulkes Telescope North Upper Limits
  56. GRB 090626: Suzaku WAM observation of the prompt emission
  57. GRB 090704: Fermi GBM observation
  58. GRB 090709: ROTSE-III Optical Limits
  59. GRB 090709: Swift detection of a bright burst
  60. GRB 090708: Early RAPTOR Optical Limits
  61. GRB 090708: ROTSE-III Optical Limits
  62. GRB 090708: Swift detection of a burst
  63. GRB 090704: a long GRB found in INTEGRAL off-line analysis
  64. GRB 090706: Fermi GBM detection
  65. Swift-BAT trigger 356516 is not a GRB
  66. Possible GRB090705: Swift-XRT observations
  67. GRB 090705: Swift detection of a possible burst
  68. GRB 090618: Mondy optical observations
  69. GRB 090529: CrAO optical upper limit
  70. GRB 090529: MTM-500 optical observations
  71. GRB 090529: Mt.Terskol optical observations
  72. XRF 090702: Swift-XRT refined analysis
  73. GRB 090703: Fermi GBM detection
  74. GRB 090702: UVOT upper limits
  75. GRB 090313: optical observations
  76. XRF 090702: VLT imaging
  77. XRF 090702: Swift-XRT afterglow position
  78. XRF 090702: a long soft GRB localized with INTEGRAL
  79. GRB 090404: Deep optical imaging and possible host association
  80. GRB 090701: Fermi GBM detection
  81. GRB 090628: Swift XRT refined analysis
  82. GRB 090630: Fermi GBM detection
  83. GRB 090618: RTT150 optical observations
  84. GRB 090628: Swift/UVOT Upper Limits
  85. Konus-Wind observation of GRB 090626
  86. GRB080628: SAO RAS optical observations
  87. GRB090618: 15GHz radio emission faded
  88. GRB 090628: GROND upper limits
  89. GRB 090628: Enhanced Swift-XRT position
  90. GRB 090628: 1.23m CAHA optical observations
  91. GRB 090626: IPN localization
  92. GRB 090628: Swift/UVOT Finding Chart Observation
  93. GRB 090628: Swift XRT position
  94. GRB 090628: Swift detection of a burst
  95. Fermi LAT observations of GRB 090626
  96. GRB 090625B: Fermi GBM observation
  97. GRB 090423: Spitzer observations of the z~8.3 burst
  98. GRB 090625B: Swift/UVOT Upper Limits
  99. GRB 090625B: Swift-XRT refined analysis
  100. GRB 090626: Fermi GBM detection

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Download all Circulars as a .tar.gz archive (updated once a day):
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