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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"

32702 results found.

  1. GRB 090423: pseudo burst at z=1 and its relation to GRB 080913
  2. GRB 090424 : Multiband Optical observation from Nainital
  3. GRB 090426: R-band limit
  4. GRB 090424: Continued R-band monitoring
  5. GRB 090423: CARMA mm observations
  6. GRB 090426: Swift/BAT spectral lag results
  7. GRB 090424: Suzaku WAM observation of the prompt emission
  8. GRB 090426: VLT spectroscopy
  9. GRB 090426: GROND Observations of the Optical/NIR Afterglow
  10. GRB 090426: Near infrared observation with ISLE at OAO
  11. GRB 090426: Okayama MITSuME optical observation
  12. GRB090426 Swift/UVOT observations
  13. GRB 090426 Keck LRIS redshift
  14. GRB 090426: Swift-BAT refined analysis
  15. GRB 090426: Swift-XRT refined analysis
  16. GRB 090423: GROND second epoch imaging and refined SED
  17. Detection of bright radio afterglow of GRB 090424 with the VLA
  18. GRB090426: Observation for Optical counterpart from MIRO
  19. GRB 090426, RIMOTS optical upper limits
  20. GRB 090426: inspection of SDSS images
  21. GRB 090426: TNT confimation of optical counterpart
  22. GRB090424: R-band detection (37.5 hrs post-burst), jet break?
  23. GRB 090424: MASTER-Net prompt optical limit
  24. GRB 090423: Fermi GBM observation (correction of isotropic equivalent energy)
  25. GRB 090424: WHT ISIS spectroscopy
  26. VLA radio observation of high-z GRB 090423
  27. GRB090424: BVRI/R-band detection after 15 hrs burst
  28. GRB 090424 : Lulin 1m telescope optical observations
  29. GRB 090424: GROND Observations of the Optical/NIR Afterglow
  30. GRB090423: Y-band limit
  31. GRB 090424 Gemini-South Redshift
  32. GRB 090423: Y-band field calibration update/correction
  33. GRB 090423: Swift/BAT spectral lag results
  34. GRB 090424 : TAOS optical detection
  35. GRB 090424 optical observations
  36. GRB 090424: Liverpool Telescope observations
  37. GRB 090424: Swift-XRT refined analysis
  38. GRB 090424: Optical observations from 1.23m CAHA
  39. GRB 090423: energetic, luminosity and jet break
  40. Swift/UVOT observations of GRB 090424
  41. GRB 090424: MASTER-Net prompt optical observations
  42. GRB 090424: Swift-BAT refined analysis
  43. GRB 090424: Fermi GBM Observation
  44. GRB 090423: Fermi GBM observation
  45. GRB 090422: Fermi GBM observation
  46. GRB 090423: Ep,i - Eiso correlation
  47. GRB 090424: SDSS Galaxy at the Swift position
  48. GRB 090424: TNT optical observations
  49. GRB 090424: ROTSE-III Confimation of Optical Counterpart
  50. GRB 090423: Refined TNG analysis
  51. GRB 090423 limiting magnitudes
  52. GRB 090423: Near infrared observation at Okayama Observatory
  53. GRB 090423: Deep z-band upper limit and confirmation of photo-z
  54. GRB 090423: TNG Amici spectrum
  55. GRB 090423: GROND detection and preliminary photo-z
  56. GRB 090423: NOT z-band limit
  57. GRB 090423: Correction to NIR photometry
  58. GRB 090423: Swift-XRT refined analysis
  59. GRB090418A Rc-band photometry
  60. GRB090423 - Swift/UVOT upper limits.
  61. GRB 090423: NIR photometry and evidence for spectral break
  62. GRB 090422: Swift-XRT refined analysis
  63. GRB090423, RIMOTS optical upper limits
  64. GRB 090423: UKIRT data further analysis
  65. GRB 090423: Swift-BAT refined analysis
  66. GRB 090422: Swift/UVOT Upper Limits
  67. GRB 090423: P60 Observations
  68. GRB 090423: Faulkes Telescope South observations
  69. GRB 090418A: R and I band observation
  70. GRB 090422: Liverpool Telescope possible candidate
  71. GRB 090418A: Konus-Wind and Swift/BAT joint spectral analysis
  72. GRB 090422: Swift-BAT refined analysis
  73. GRB 090410: Erratum in GCN 9189
  74. GRB 090408A: Erratum in GCN 9188
  75. GRB 090418B: RTT150 optical observations
  76. GRB 090418A: RTT150 optical observations
  77. GRB 080410: GAO 150cm telescope Optical Observation
  78. GRB 080408A: GAO 150cm telescope Optical Observation
  79. GRB 090422: Liverpool Telescope observations
  80. GRB 090417B: Optical observation
  81. GRB 090418A: optical observations
  82. GRB 090418B: GROND observations
  83. GRB 090419: Swift/UVOT Observations
  84. GRB 090418B: Faulkes Telescope North observations
  85. GRB 090418A: Swift/UVOT Observations
  86. GRB 090417B: Swift/UVOT Upper Limits
  87. GRB 090417B Correction to the BAT refined analysis position
  88. GRB 090419: Swift-XRT refined analysis
  89. Konus-Wind observation of GRB 090418B
  90. GRB 090418: Erratum in GCN 9168
  91. GRB 090419: GROND detection of afterglow candidate
  92. GRB 090418: Optical observations with MITSuME Okayama and Ishigaki 1m telescope
  93. GRB 090419: Swift-BAT refined analysis
  94. VLA radio detection of GRB 090418
  95. VLA radio upper limit on GRB 090417B
  96. GRB 090418: Swift XRT refined analysis
  97. GRB 090418A: ROTSE-III Refined Analysis
  98. VLA observations of short burst GRB 090417A
  99. GRB 090417B: Gemini imaging
  100. GRB 090418: Swift-BAT refined analysis

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