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GCN Circulars

GCN Circulars are rapid astronomical bulletins submitted by and distributed to community members worldwide. They are used to share discoveries, observations, quantitative near-term predictions, requests for follow-up observations, or future observing plans related to high-energy, multi-messenger, and variable or transient astrophysical events. 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').
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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.

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subject:"Swift"
body:"GRB"
submitter:"Judith Racusin"

32490 results found.

  1. GRB 080721 : Lulin 2nd optical follow-ups
  2. GRB 080721: OA fading and redshift
  3. TNG/DOLORES redshift for GRB080721
  4. GRB 080721: UVOT Follow-Up Observations
  5. Konus-Wind observation of GRB 080721
  6. GRB 080721: Swift-XRT refined analysis
  7. GRB 080721, Swift-BAT refined analysis
  8. GRB 080721: Swift/UVOT Photometric Redshift
  9. GRB 080721 : Lulin Optical follow-ups
  10. GRB 080721: Swift-XRT correct position
  11. Retraction of Swift Trigger 317393
  12. GRB 080714: GROND confirmation of the optical/NIR afterglow
  13. Konus-Wind observation of GRB 080714
  14. GRB 080714: Swift/UVOT Detection of an Optical Afterglow
  15. GRB 080714: Swift-XRT refined analysis
  16. GRB 080714: Swift-BAT refined analysis
  17. GRB 080702A: optical upper limit
  18. GRB 080603A: CrAO optical observations
  19. GRB 080603B: optical observations in MAO
  20. GRB 080603B: optical observations in CrAO
  21. GRB 080710: Optical observation with MITSuME Okayama
  22. GRB 080710: TLS observations, steepening afterglow decay
  23. GRB 080702B: Swift XRT confirmation of the afterglow
  24. GRB 080710, Swift-BAT refined analysis
  25. GRB 0800707: optical observations
  26. GRB 080710: Rapid PROMPT Observations
  27. GRB 080710: Swift-XRT refined analysis
  28. GRB080710: Swift/UVOT observations
  29. GRB 080710: Faulkes Telescope North observations
  30. GRB 080710: Gemini spectroscopy and probable redshift
  31. UVOT white band observations of GRB080710
  32. GRB 080710: REM afterglow confirmation & brightening
  33. GRB 080710: KAIT OA candidate
  34. GRB 080707: possible break in the X-rays
  35. New Swift-XRT GRB products available online.
  36. GRB 080707: GROND Confirmation of the Optical Afterglow
  37. UVOT observations of GRB080707
  38. GRB 080707, Swift-BAT refined analysis
  39. GRB 080707: Swift XRT refined analysis
  40. GRB 080707: VLT redshift
  41. GRB 080707: GROND Detection of the Optical Afterglow Candidate
  42. Refined analysis of Swift Trigger 316063, is IGR J08408-4503
  43. GRB 080703: GROND Upper Limits
  44. GRB 080702B: GROND Upper Limits
  45. GRB 080703: Swift-XRT refined analysis
  46. GRB 080703: UVOT Follow-Up Observation
  47. GRB 080703: VLT observations of the afterglow
  48. GRB 080703, Swift-BAT refined analysis
  49. GRB 080703A: ROTSE-III Detection of Optical Counterpart
  50. No radio detection from the short GRB 080702A
  51. GRB 080702b: LCO optical observations
  52. Swift/UVOT observation of GRB080702A
  53. GRB 080702B: Swift XRT and UVOT observations
  54. GRB 080625: Suzaku WAM observation of the prompt emission
  55. GRB 080702A: MITSuME Akeno optical upper limits
  56. GRB 080701A: Early RAPTOR optical limits
  57. Swift Trigger 315630: Swift/UVOT Upper Limits
  58. GRB 080702A, Swift-BAT refined analysis
  59. GRB 080702A: Swift-XRT Team refined analysis
  60. Swift Trigger 315630: TLS R-band observation
  61. Swift Trigger 315630: Probably not a GRB
  62. GRB 080701: Swift-XRT refined analysis
  63. GRB 080701A, VATT optical upper limit
  64. TLS I-Band Observation of GRB 080701A
  65. GRB 080701A: Swift/UVOT Upper Limits
  66. GRB 080701A: Early Super-LOTIS Observations
  67. GRB 080701A, Swift-BAT refined analysis
  68. GRB 080623: Suzaku WAM observation of the prompt emission
  69. GRB 080625: Swift/UVOT Follow-Up Observations
  70. GRB 080625: Further observations from OSN
  71. GRB 080625:Swift-XRT detection of the afterglow
  72. GRB 080625: Swift/UVOT Detection of an Optical Afterglow
  73. GRB 080625: Observations at OSN
  74. GRB 080623: GROND upper limits
  75. GRB080623: Swift UVOT followup observations
  76. GRB 080623: Swift-XRT refined analysis
  77. GRB 080623, Swift-BAT refined analysis
  78. GRB 080623: Swift/UVOT Non-Detection of an Optical Afterglow
  79. Swift trigger 314975 is not a GRB
  80. GRB080607: optical observation
  81. GRB 080603b: optical observation
  82. GRB 070809: Putative host galaxy and redshift
  83. VLA upper limit on INTEGRAL burst GRB 080613A
  84. GRB 0800603A: optical observation
  85. GRB080613B: MITSuME upper limits
  86. GRB080613A: Optical upper limits with Okayama MITSuME telescope
  87. Konus-Wind observation of GRB 080613B
  88. GRB 080603A: optical observations on June 04
  89. GRB 080613A: Swift-XRT detection of the afterglow
  90. GRB080613A: Swift/UVOT Upper Limits
  91. GRB 080613A: GROND Confirmation of the Afterglow Candidate
  92. GRB 080613B: GROND Upper Limits
  93. GRB 080613B - NOT optical and IR nondetections
  94. GRB080613B: Swift/UVOT Upper Limits
  95. GRB 080613B, Swift-BAT refined analysis
  96. GRB 080613B: Swift-XRT refined analysis
  97. GRB 080514B: Spectroscopic constraints and probable host galaxy
  98. GRB 080613: Faulkes Telescope North optical candidate
  99. GRB 080603A: Late-time Keck imaging and spectroscopy
  100. GRB 080603b: optical observation

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