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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"

43710 results found.

  1. GRB 090715B: Swift detection of a burst with a possible optical counterpart
  2. GRB 090715A: ROTSE-III Optical Limits
  3. GRB 090715: Swift detection of a short hard burst
  4. Detection of GRB 090618 by RT-2 Experiment onboard the CORONAS-PHOTON Satellite
  5. Swift satellite anomaly
  6. GRB 090712: Fermi GBM observation
  7. GRB 090713: Fermi GBM detection
  8. GRB 090712: Swift-BAT refined analysis
  9. GRB 090712: Swift detection of a burst
  10. GRB 090709A: Xinglong TNT optical upper limit
  11. VLA radio observations of GRB 090709A
  12. GRB 090621B: MTM-500 optical observations
  13. GRB 090709A: deep optical observation with the 10.4m GTC
  14. GRB090709A : WSRT Radio observation
  15. GRB 090709A: Suzaku WAM observation of the prompt emission
  16. GRB 090709A: Swift UVOT upper limits
  17. GRB 090709A: WHT LIRIS observations
  18. GRB 090709B: Fermi GBM detection
  19. GRB 090709A: confirmation of the periodicity in the SPI-ACS data
  20. GRB 090709A: evidence for a very red afterglow at low z
  21. Konus-Wind and Konus-RF observations of GRB 090709A
  22. GRB 090709A: P60 Observations
  23. GRB 090709A: Quasiperiodic variations in the BAT light curve
  24. GRB 090709A: NOT optical observations
  25. GRB 090709A: RAPTOR Limits During Gamma-Ray Emission
  26. GRB 090709A: Swift XRT Refined Analysis
  27. GRB 090709B, Swift-BAT refined analysis
  28. GRB 090709A: Swift-BAT refined analysis
  29. GRB090709A: High Energy BAT/XRT Analysis Suggests Low to Moderate Redshift
  30. GRB 090709A: Wyoming Infrared Observatory NIR upper limits
  31. GRB 090709A: Enhanced Swift-XRT position
  32. GRB 090709A - PAIRITEL Discovery of a Red Afterglow
  33. GRB 090709A: Subaru NIR observation
  34. GRB 090709B: Swift detection of a burst
  35. GRB 090709 : planned Suzaku-ToO observation
  36. GRB 090708 : Fermi GBM detection
  37. GRB 090709: Faulkes Telescope North Upper Limits
  38. GRB 090626: Suzaku WAM observation of the prompt emission
  39. GRB 090709: PAIRITEL NIR Upper Limits
  40. GRB 090704: Fermi GBM observation
  41. GRB 090709: ROTSE-III Optical Limits
  42. GRB 090709: Swift detection of a bright burst
  43. GRB 090708: Early RAPTOR Optical Limits
  44. GRB 090708, Swift-BAT refined analysis
  45. GRB 090708: ROTSE-III Optical Limits
  46. GRB 090708: Swift detection of a burst
  47. GRB 090704: a long GRB found in INTEGRAL off-line analysis
  48. GRB 090706: Fermi GBM detection
  49. Swift-BAT trigger 356516 is not a GRB
  50. Possible GRB090705: Swift-XRT observations
  51. GRB 090705: PAIRITEL NIR Observations
  52. GRB 090705: Swift detection of a possible burst
  53. XRF 090702 : RTT150 optical observations
  54. GRB 090618: Mondy optical observations
  55. GRB 090529: CrAO optical upper limit
  56. GRB 090529: MTM-500 optical observations
  57. GRB 090529: Mt.Terskol optical observations
  58. XRF 090702: Swift-XRT refined analysis
  59. GRB 090703: Fermi GBM detection
  60. GRB 090313: optical observations
  61. XRF 090702: VLT imaging
  62. XRF 090702: Swift-XRT afterglow position
  63. XRF 090702: a long soft GRB localized with INTEGRAL
  64. GRB 090404: Deep optical imaging and possible host association (correction)
  65. GRB 090404: Deep optical imaging and possible host association
  66. GRB 090701: Fermi GBM detection
  67. GRB 090628: Swift XRT refined analysis
  68. GRB 090630: Fermi GBM detection
  69. GRB 090628: Swift/UVOT Upper Limits
  70. Konus-Wind observation of GRB 090626
  71. GRB080628: SAO RAS optical observations
  72. GRB 090628: Swift-BAT refined analysis
  73. GRB090618: 15GHz radio emission faded
  74. GRB 090628: GROND upper limits
  75. GRB 090628: Enhanced Swift-XRT position
  76. GRB 090628: 1.23m CAHA optical observations
  77. GRB 090626: IPN localization
  78. GRB 090628: Swift/UVOT Finding Chart Observation
  79. GRB 090628: Swift XRT position
  80. GRB 090628: Swift detection of a burst
  81. Fermi LAT observations of GRB 090626
  82. GRB 090625B: Fermi GBM observation
  83. GRB 090423: Spitzer observations of the z~8.3 burst
  84. GRB 090625B: Swift/UVOT Upper Limits
  85. GRB 090625B: Swift-XRT refined analysis
  86. GRB 090626: Fermi GBM detection
  87. GRB 090623: Suzaku WAM observation of the prompt emission
  88. GRB 090625B: Faulkes Telescope South observations
  89. GRB 090625B: Swift observation of the INTEGRAL GRB 090625B
  90. GRB 090625B: a long GRB localized by INTEGRAL
  91. GRB 090625: Fermi GBM detection
  92. GRB 090618: Correction to GCN 9568
  93. GRB 090617: Suzaku WAM observation of the prompt emission
  94. GRB 090618: Suzaku WAM observation of the prompt emission
  95. GRB 090621A: Enhanced Swift-XRT position
  96. GRB 090623: Fermi GBM detection
  97. GRB 090621B: GRT Optical Observation
  98. GRB 090621A: GRT Optical Observation
  99. PAIRITEL observations of GRB 090618
  100. GRB 090621B: Fermi GBM detection

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