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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"

5859 results found.

  1. GRB 130907A: MASTER refined analysis
  2. GRB 130912A: Skynet DSO-14/Yerkes-41/PROMPT-CTIO observations
  3. GRB 130907A: Continued RATIR Optical and NIR Observations
  4. GRB 130907A: RATIR Optical and NIR Observations
  5. GRB 130828A: Further Swift XRT observations
  6. GRB 130907A: INTEGRAL/SPI-ACS light curve
  7. GRB 130907A: RATIR Optical and NIR Afterglow Confirmation
  8. GRB 130907A: Skynet DSO-14/Yerkes-41 detections of a possible afterglow
  9. GRB 130831A: Maidanak optical observations
  10. GRB 130831A: optical observation in Chuguev AO
  11. GRB 130907A: MASTER early OT observations
  12. GRB 130831A: RATIR Optical and NIR Upper Limits
  13. GRB 130903A: GROND Afterglow Discovery
  14. GRB 130903A: MASTER early optical limit
  15. GRB 130903A: ISON-Kislovodsk optical Upper Limits
  16. GRB 130831A: RATIR Optical and NIR Observations
  17. GRB 130831A: Continued Skynet/PROMPT-SSO, PROMPT-CTIO and Yerkes-41 detections
  18. Swift Trigger 569022: a possible GRB
  19. GRB 130831A: THO optical observation
  20. GRB 130831A: Montarrenti Observatory optical observations
  21. GRB 130831A: Faulkes Telescope North and South optical afterglow
  22. IPN triangulation of GRB 130828A
  23. GRB 130623A: GROND detection of the optical/NIR afterglow
  24. IPN localization of GRB 130804A
  25. SGR 1745-29 (Swift trigger 565443), Swift-BAT refined analysis
  26. GRB 130804A; Fermi GBM observation
  27. Trigger 565443: Swift detection of a burst from SGR J1745-29
  28. GRB 130719A: Skynet/PROMPT observations
  29. GRB 130722A: Swift detection of a burst
  30. GRB 130708A: Swift XRT and UVOT Observations
  31. Fermi394416326: FTN detection
  32. GRB 130701A: MITSuME Akeno Optical observation
  33. GRB 130701A: VLT/X-shooter redshift
  34. GRB 130627A: Swift-XRT observations
  35. GRB 130627A: Swift detection of a burst
  36. Swift Trigger 558828 is not an interesting event
  37. Fermi/GBM observation of the Soft Gamma Repeater SGR J1550-5418
  38. Trigger 558399: Swift detection of the Soft Gamma Repeater AXP 1E1547.0-5408
  39. GRB 130615A: Skynet/PROMPT Observations
  40. GRB 130615A: Enhanced Swift-XRT position
  41. GRB 130615A: Swift-BAT refined analysis
  42. GRB 130615A: GROND afterglow candidate
  43. GRB 130615A: Swift detection of a burst
  44. GRB 130612A: NOT optical observations
  45. GRB 130609B: Fermi GBM observation
  46. GRB 130609B: GROND observations
  47. GRB 130608A: ISON-Kislovodsk optical upper limit
  48. GRB 130609B: Swift detection of a burst with an optical counterpart
  49. GRB 130609A: Fermi GBM observation
  50. Swift Trigger 557674 was due to an onboard position error
  51. GRB 130606A: VLT/X-shooter redshift confirmation
  52. GRB 130606A: Swift detection of a burst
  53. GRB 130604A: Swift detection of a burst
  54. GRB 130603A: MITSuME Okayama Optical Observation
  55. GRB 130529A: Swift detection of a burst
  56. GRB 130527A: Swift detection of a bright burst
  57. GRB 130521A: Swift detection of a burst
  58. GRB 130514A: Swift detection of a burst
  59. GRB 130427A: Keck/LRIS Observations
  60. GRB 130505B: Swift Candidate Afterglow
  61. Refined IPN Triangulation of GRB 130502B
  62. GRB 130505B: MAXI/GSC detection
  63. GRB 130502A: optical upper limit
  64. Swift/UVOT observations of GRB130505A
  65. GRB 130505A: iTelescope T12 optical observations
  66. GRB 130505A: MITSuME Okayama Optical Observation
  67. GRB 130505A: MAXI/GSC detection
  68. GRB 130504A: IAC80 optical candidate
  69. GRB 130505A: Swift detection of a burst with optical afterglow
  70. GRB 130504A: MITSuME Okayama upper limits
  71. GRB 130504A: Enhanced XRT position
  72. Swift-XRT X-ray afterglow candidate for GRB 130504A (BAT trigger 555096)
  73. IPN Triangulation of GRB 130502B
  74. GRB 130502A: TNG candidate counterpart
  75. GRB 130427A: Nishi-Harima Optical Spectroscopic Observations
  76. GRB 130427A optical time series
  77. GRB 130427A: MITSuME Okayama Optical Observation
  78. GRB 130427B: Swift detection of a burst with optical counterpart
  79. GRB 130427A: Gemini-North redshift
  80. IPN Triangulation of GRB 130425A
  81. GRB 130418A: T21 optical observation
  82. GRB 130418A: T18 and T21 optical observations
  83. GRB 130418A: Swift/UVOT Detection and request for continuing coverage
  84. GRB 130418A: Swift detection of a burst with an optical counterpart
  85. GRB 130408A: SMARTS optical/IR afterglow observations
  86. Swift XRT observations of GRB 130310A
  87. GRB 130310A : Suzaku WAM observation of the prompt emission
  88. GRB 130313A: MASTER-Net optical observations
  89. GRB 130313A: Swift detection of a short burst
  90. GRB 130310A: optical observations
  91. Swift XRT observations of GRB 130310A
  92. Konus-Wind observation of GRB 130310A
  93. IPN triangulation of GRB 130310A
  94. GRB 130310A: Fermi GBM detection
  95. GRB 130310A: Fermi-LAT detection and localization
  96. GRB 130215A: Additional P200 NIR observations
  97. GRB 130215A: MITSuME Okayama Optical Observation
  98. GRB 121128A: optical observations
  99. GRB 130211A: Swift-XRT refined Analysis
  100. GRB 130211A: GROND detection of the afterglow

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