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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"

36217 results found.

  1. GRB 080120: GROND confirmation of the optical afterglow
  2. VLA radio upper limit on GRB 080120
  3. GRB 080120: Swift-XRT refined analysis
  4. GRB 080120: GROND detection
  5. GRB 080120 : Planned XMM-Newton observation
  6. GRB080120: Swift XRT position
  7. GRB 080120: a long GRB detected by INTEGRAL
  8. XRF 080109 / SN 2008D: spectroscopic evolution
  9. Swift observations of the X-ray transient in NGC 2770 (aka SN2008D)
  10. XRB 080109/SN 2008D: Early decline in brightness and change in colors
  11. XRF 080109 in NGC2770: Detectable Superluminal Motion
  12. Detailed Spectroscopic ID of SN 2008D (Transient in NGC 2770)
  13. Transient in NGC 2770: spectroscopic evidence for a SN
  14. Bright X-ray transient / possible XRF in NGC 2770: TNG R imaging
  15. GRB 071227: Suzaku WAM observation of the prompt emission
  16. GRB 071227: optical afterglow
  17. Further Swift-BAT analysis of GRB 071227
  18. Konus-Wind observation of GRB 071227
  19. GRB 071227: Magellan redshift confirmation
  20. GRB 071227: Swift-XRT refined analysis
  21. GRB 071227: VLT probable redshift of the candidate host galaxy
  22. GRB 071227: Magellan observations
  23. GRB 071227: REM NIR and Optical observations
  24. Swift-BAT refined analysis of short GRB 071227
  25. GRB 071227: Swift detection of a burst
  26. GRB071020: optical observations
  27. GRB 070429B: Possible UVOT Detection of an Optical Afterglow
  28. Swift-BAT trigger 298308 is not a GRB
  29. GRB 071208?: Swift detection of a possible burst
  30. IBAS Alert #4772 in not a GRB
  31. GRB 071125: Suzaku WAM observation of the prompt emission
  32. GRB 070429B: Probable host galaxy and redshift
  33. GRB 071129, Swift-BAT refined analysis
  34. GRB 071129: Swift detection of a burst
  35. Konus-Wind and Konus-A observations of GRB 071125
  36. IPN triangulation of very bright GRB 071125
  37. GRB 071112C: Optical/NIR observations
  38. Disregard the "GRB 071126" position
  39. GRB 071126: Enhanced Swift-XRT position
  40. VLA radio detection of GRB 071122
  41. GRB071122: Swift/UVOT Observations
  42. GRB071104: NIR Afterglow Candidate at TNG
  43. GRB 071122: MASTER optical observation
  44. GRB 071122, Swift-BAT refined analysis
  45. GRB 071122 Swift XRT position update sent in error.
  46. GRB 071122 Swift-XRT refined analysis
  47. GRB 071122: Corrected P60 Coordinates
  48. GRB071122: Gemini Absorption redshift
  49. GRB 071122: P60 Optical Afterglow Candidate
  50. GRB 071122: ROTSE-III Optical Limits
  51. GRB 071122: Swift detection of a burst
  52. GRB 071118: P60 Observations
  53. GRB071118 MITSuME OAO optical observation
  54. GRB 071118: Observations from OSN
  55. GRB 071117: VLT observations and probable redshift
  56. Swift/UVOT observations of GRB071118
  57. GRB 071117: Swift-XRT revised position
  58. Konus-Wind and Konus-A observations of GRB 071117
  59. Swift XRT follow-up observations of GRB071008
  60. Swift/UVOT upper limits for GRB 071117
  61. GRB071118: Swift XRT refined analysis
  62. GRB 071117: Gemini Optical Afterglow Discovery
  63. GRB 071118, Swift-BAT refined analysis
  64. GRB 071117: TAROT La Silla observatory optical observations
  65. GRB 071112B: Gemini Image Differencing
  66. GRB 071118: Swift detection of a burst
  67. GRB 071117: Gemini Observations
  68. GRB 071117: Las Campanas optical observations
  69. GRB 071117: Swift-XRT refined analysis
  70. GRB 071117, Swift-BAT refined analysis
  71. VLT FORS2 observations of short hard GRB071112B
  72. GRB 071117: Swift/XRT position
  73. GRB 071117: Initial Swift/UVOT observations
  74. GRB 071117: Swift detection of a bright burst
  75. VLA radio upper limit on GRB 071112C
  76. ATCA radio observations of short hard burst GRB 071112B
  77. GRB 071112C: Optical and NIR data observed with KANATA
  78. GRB 071112C: WSRT Radio Observations
  79. GRB 071112C: optical observation
  80. GRB 071112C: optical observation
  81. GRB 071112C: emission lines and refined VLT redshift
  82. GRB 071112C MITSuME Akeno early optical observation
  83. GRB 071112C: Gemini Absorption Redshift
  84. GRB 071112B: 2nd epoch of Magellan i-band imaging
  85. GRB 071112C: SARA upper limit
  86. GRB 071112C : Second Epoch Lulin R-band observations
  87. GRB071112C MITSuME Okayama Optical Observation
  88. GRB 071112C: Swift-BAT refined analysis
  89. GRB 071112C: Swift/UVOT observations
  90. GRB 071112C: Swift XRT refined analysis
  91. GRB 071112C: Optical observations at Crni Vrh
  92. Swift UVOT upper limits of GRB071112B
  93. GRB 071112C: VLT redshift
  94. GRB 071112B: Magellan i-band imaging
  95. GRB 071112B: Gemini Optical Imaging (Correction)
  96. GRB 071112B: Gemini Optical Imaging
  97. GRB 071112B: Swift-XRT preliminary analysis
  98. GRB 071112B, Swift-BAT partial refined analysis of the SHB
  99. GRB071112C: NOT observations
  100. GRB 071112C: Palomar Pre-Imaging

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