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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').
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.

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

36141 results found.

  1. GRB 080710: REM afterglow confirmation & brightening
  2. GRB 080710: KAIT OA candidate
  3. GRB 080710: Swift XRT position
  4. GRB 080710: Swift detection of a burst
  5. GRB 080707: possible break in the X-rays
  6. New Swift-XRT GRB products available online.
  7. GRB 080707: GROND Confirmation of the Optical Afterglow
  8. UVOT observations of GRB080707
  9. GRB 080707, Swift-BAT refined analysis
  10. GRB 080707: Swift XRT refined analysis
  11. GRB 080707: Enhanced Swift-XRT position
  12. GRB 080707: VLT redshift
  13. GRB 080707: GROND Detection of the Optical Afterglow Candidate
  14. GRB 080707: Swift detection of a burst
  15. Refined analysis of Swift Trigger 316063, is IGR J08408-4503
  16. Trigger 316063: Swift detection of a transient
  17. GRB 080703: GROND Upper Limits
  18. GRB 080702B: GROND Upper Limits
  19. GRB 080703: Swift-XRT refined analysis
  20. GRB 080703: UVOT Follow-Up Observation
  21. GRB 080703: VLT observations of the afterglow
  22. GRB 080703: Enhanced Swift-XRT position
  23. GRB 080703, Swift-BAT refined analysis
  24. GRB 080702B Swift-BAT refined analysis
  25. GRB 080703: Swift detection of a burst with optical afterglow
  26. GRB 080703A: ROTSE-III Detection of Optical Counterpart
  27. No radio detection from the short GRB 080702A
  28. GRB 080702b: LCO optical observations
  29. GRB 080702B: Swift XRT and UVOT observations
  30. GRB 080625: Suzaku WAM observation of the prompt emission
  31. GRB 080702A: MITSuME Akeno optical upper limits
  32. GRB 080701A: Early RAPTOR optical limits
  33. GRB 080702A, Swift-BAT refined analysis
  34. GRB 080702A: Swift-XRT Team refined analysis
  35. GRB 080702B : Burst detected in BAT during Swift slew
  36. GRB 080702A: Enhanced Swift-XRT position
  37. Swift Trigger 315630: Probably not a GRB
  38. GRB 080702: Swift detection of a short burst
  39. GRB 080701: Swift-XRT refined analysis
  40. GRB 080701A, VATT optical upper limit
  41. TLS I-Band Observation of GRB 080701A
  42. GRB 080701A: Swift/UVOT Upper Limits
  43. GRB 080701A: Early Super-LOTIS Observations
  44. GRB 080701: Enhanced Swift-XRT position
  45. GRB 080701A, Swift-BAT refined analysis
  46. GRB 080701: Swift-XRT Prompt Analysis
  47. GRB 080701: Swift detection of a burst
  48. GRB 080623: Suzaku WAM observation of the prompt emission
  49. GRB 080625: Swift/UVOT Follow-Up Observations
  50. GRB 080625: Further observations from OSN
  51. GRB 080625:Swift-XRT detection of the afterglow
  52. GRB 080625: Swift/UVOT Detection of an Optical Afterglow
  53. GRB 080625: Observations at OSN
  54. GRB 080625: Gamma Ray Burst Localization by SuperAGILE
  55. GRB 080623: GROND upper limits
  56. GRB080623: Swift UVOT followup observations
  57. GRB 080623: Swift-XRT refined analysis
  58. GRB 080623, Swift-BAT refined analysis
  59. GRB 080623: Enhanced Swift-XRT position
  60. GRB 080623: TAROT La Silla observatory optical observations
  61. GRB 080623: Swift/UVOT Non-Detection of an Optical Afterglow
  62. GRB 080623: Swift XRT prompt analysis
  63. GRB 080623: Swift detection of a burst
  64. Swift trigger 314975 is not a GRB
  65. GRB080607: optical observation
  66. GRB 080603b: optical observation
  67. GRB 070809: Putative host galaxy and redshift
  68. VLA upper limit on INTEGRAL burst GRB 080613A
  69. GRB 0800603A: optical observation
  70. GRB080613B: MITSuME upper limits
  71. GRB080613A: Optical upper limits with Okayama MITSuME telescope
  72. Konus-Wind observation of GRB 080613B
  73. GRB 080603A: optical observations on June 04
  74. GRB 080613A: Swift-XRT detection of the afterglow
  75. GRB080613A: Swift/UVOT Upper Limits
  76. GRB 080613A: GROND Confirmation of the Afterglow Candidate
  77. GRB 080613B: GROND Upper Limits
  78. GRB 080613B - NOT optical and IR nondetections
  79. GRB080613B: Swift/UVOT Upper Limits
  80. GRB 080613B, Swift-BAT refined analysis
  81. GRB 080613B: Swift-XRT refined analysis
  82. GRB 080514B: Spectroscopic constraints and probable host galaxy
  83. GRB 080613B: Swift detection of a burst
  84. GRB 080613: Faulkes Telescope North optical candidate
  85. GRB 080613 : a long GRB detected with INTEGRAL
  86. GRB 080603A: Late-time Keck imaging and spectroscopy
  87. GRB 080603b: optical observation
  88. GRB 080603A: final Swift-XRT observations.
  89. GRB 080607: AGILE-MCAL observation of the prompt emission
  90. GRB 080603B - TLS 2nd Epoch: Another Break
  91. GRB 080605: TLS 3rd Epoch - Source Confusion
  92. GRB080605: optical observation with the MITSuME-OAO telescope
  93. Konus-Wind observation of GRB 080607
  94. GRB 080603A: optical observations
  95. GRB 080607: Swift-XRT refined analysis
  96. Swift/UVOT Observations of GRB080607
  97. GRB 080605: optical observations
  98. GRB 080607 KAIT observations
  99. VLA detection of INTEGRAL burst GRB 080603A
  100. Konus-Wind observation of GRB 080605

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