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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"

21815 results found.

  1. Swift J185003.2-005627: TAROT Calern observatory optical observations
  2. Swift J185003.2-005627: Swift detection of a burst from a new Galactic transient
  3. GRB 110618A: SMARTS optical observations
  4. SGR 1E 1841-045: Swift detection of a soft gamma repeater burst
  5. Konus-Wind observation of GRB 110618A
  6. IPN triangulation of GRB110618A (long duration, extremely intense)
  7. GRB 110604A: Suzaku WAM observation of the prompt emission
  8. GRB 110610A: Suzaku WAM observation of the prompt emission
  9. GRB 110610A: 1.23m CAHA optical observations
  10. GRB 110610A: Swift/UVOT Upper Limits
  11. GRB 110610A: Enhanced Swift-XRT position
  12. Swift detection of the X-ray afterglow of GRB 110604A
  13. GRB 110610A: MASTER-NET optical observations
  14. GRB 110610A: Swift detection of a burst
  15. Konus-Wind observation of GRB 110604A
  16. GRB 110604A Detection by IPN Spacecraft and Swift-BAT
  17. GRB 110529A: Suzaku WAM observation of the prompt emission
  18. GMRT detection of GRB 110328A
  19. GRB 110530A: Swift/UVOT Detection of a Fading Afterglow
  20. GRB 110530A: Enhanced Swift-XRT position
  21. GRB 110530A: NOT optical observations
  22. GRB110530A: MITSuME Okayama Optical Observation
  23. GRB 110530A: MASTER OT observations
  24. GRB 110530A: Swift detection of a burst with an optical afterglow
  25. Konus-Wind observation of GRB 110529A
  26. LAT Observations of GRB110529A
  27. EVLA afterglow limits on the high z GRB090429B
  28. Swift J1644+57/GRB 110328A, Additional HST Observations
  29. GRB 110521A: MASTER prompt optical limit
  30. GRB 110521A: Swift/UVOT Upper Limits
  31. GRB 110520A: NOT optical follow-ups
  32. GRB 110521A - NOT optical observation
  33. GRB 110521A: Enhanced Swift-XRT position
  34. GRB 110521A: MASTER synchronous and early optical observations limit
  35. Swift/UVOT observations of GRB110520A
  36. GRB 110521A: Swift detection of a burst
  37. GRB 110520A: IAC80 I-band observations
  38. GRB 110520A: Enhanced Swift-XRT position
  39. GRB 110520A: WHT IR observations
  40. GRB 110520A - NOT optical observation
  41. GRB 110520A: TAROT Calern observatory optical observations
  42. GRB 110520A: MASTER-NET optical observations
  43. GRB 110520A: Swift detection of a burst
  44. Konus-Wind observation of GRB 110518A
  45. IPN localization of bright GRB 110518A
  46. GRB 110519A, Swift-BAT refined analysis
  47. GRB 110426A: Fermi GBM detection
  48. GRB 110503A: TAROT Calern observatory optical observations
  49. Konus-Wind observation of GRB 110503A
  50. GRB 110503A: optical observation in CrAO
  51. GRB 110503A: Centimeter observation from EVLA
  52. GRB 110503A: Millimeter observation from SMA
  53. GRB 110503A: SARA-N Observations and Photometric Calibration
  54. GRB 110503A: Swift/UVOT Observations
  55. GRB 110503A: PAIRITEL NIR Detection
  56. GRB 110503A: Swift-BAT refined analysis
  57. GRB 110503A: Enhanced Swift-XRT position
  58. GRB 110503A: Swift detection of a burst with a bright optical counterpart
  59. GRB 110426A: Swift/XRT non-detection
  60. GRB 110428A : X-ray afterglow confirmation
  61. GRB 110428A: Suzaku WAM observation of the prompt emission
  62. GRB 110422A: optical observations in CrAO
  63. GRB 110428A : Swift-XRT observations
  64. Konus-Wind observation of GRB 110428A
  65. GRB 110426A: MASTER synchronous with MAXI/GSC observations
  66. GRB 110422A: optical observations in CrAO, second epoch
  67. GRB 110422A: Suzaku WAM observation of the prompt emission
  68. GRB110422A: NOT optical follow-ups
  69. GRB 110422A: optical observations in CrAO
  70. GRB110422A: MITSuME Ishigakijima Optical Observation
  71. Konus-Wind observation of GRB 110422A
  72. GRB 110422A: Further NOT observation
  73. GRB 110422A: Swift/UVOT Detection of optical afterglow
  74. GRB 110422A: THO optical observations
  75. GRB 110422A: Enhanced Swift-XRT position
  76. GRB 110422A: TNG optical observations
  77. GRB 110422A: SAO RAS optical observations
  78. GRB 110422A: NOT optical observation
  79. GRB 110422A: Swift-BAT refined analysis
  80. GRB 110422A: Mondy optical observations
  81. GRB 110422A: Swift detection of a burst
  82. GRB 110420B: Swift/UVOT Upper Limits
  83. GRB110420A: GROND detection of the Optical/NIR Afterglow Candidate
  84. GRB 110420B: Swift-XRT afterglow candidate retraction
  85. GRB 110420B, GROND observations
  86. GRB 110420A Swift/UVOT Observations
  87. GRB 110420A: Enhanced Swift-XRT position
  88. GRB 110420A: Swift detection of a burst with optical counterpart
  89. GRB110414A: MITSuME Ishigakijima Optical upper limits
  90. GRB 110414A: GROND upper limits
  91. GRB110414A: MITSuME Okayama Optical upper limits
  92. GRB 110414A: Swift/UVOT Upper limits
  93. GRB 110414A: Enhanced Swift-XRT position
  94. GRB 110328A / Swift J164449.3+573451: WISE quiescent source upper limit
  95. GRB 110414A: Swift detection of a burst
  96. GRB 110411A: PAIRITEL NIR Upper Limits
  97. GRB 110412A: Fermi GBM observation
  98. GRB 110411A: Swift/UVOT Upper Limits
  99. GRB 110411A: MASTER prompt and follow-up optical limits
  100. GRB 110411A, Swift-BAT refined analysis

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