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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"

24541 results found.

  1. GRB 150910A: Swift-XRT refined Analysis
  2. GRB 150910A: Nanshan optical observations
  3. GRB 150910A: Swift-BAT refined analysis
  4. GRB 150910A: MITSuME Okayama Optical Observation
  5. GRB 150910A: LCOGT FTN afterglow observations
  6. GRB 150910A: KAIT Optical Afterglow Detection
  7. GRB 150910A: Swift detection of a burst with an optical afterglow
  8. Short GRB 150906B: proximity to NGC 3313 galaxy group
  9. Konus-Wind observation of GRB 150906B
  10. IPN Triangulation of GRB 150906B (short/intense)
  11. GRB 150907B: Swift-BAT refined analysis
  12. GRB 150907B: MASTER-SAAO early optical observations
  13. GRB 150907B: Swift-XRT observations
  14. GRB 150907A: Swift-XRT observations
  15. GRB 150907B: Swift detection of a burst
  16. GRB 150906A: Fermi GBM detection
  17. ANTARES neutrino Alert150901.32 alert and Swift XRT counterpart: MASTER optical observations and new possible candidate
  18. GRB 150902A: Swift-XRT observations
  19. GRB 150902A: MASTER-SAAO optical observations
  20. Konus-Wind observation of GRB 150902A
  21. GRB 150901A, Swift-BAT refined analysis
  22. GRB 150902A: Fermi GBM detection
  23. GRB 150902A: Fermi-LAT detection
  24. Konus-Wind observation of GRB 150831A
  25. GRB 150901A: Swift detection of a burst
  26. GRB 150821A: Flattening in the UVOT light curve
  27. GRB 150831B: Swift-BAT refined analysis
  28. GRB 150831B: MASTER-IAC early optical observations
  29. GRB 150831B: Fermi GBM detection
  30. GRB 150831B: Swift-XRT observations
  31. GRB 150831B: Swift detection of a probable burst
  32. GRB 150831A: Swift-BAT refined analysis
  33. INTEGRAL detection of GRB 150831A
  34. Konus-Wind observation of GRB 150824A
  35. IPN Triangulation of GRB 150824A
  36. GRB 150824A: Fermi GBM detection
  37. Konus-Wind observation of GRB 150821A
  38. GRB 150821A: LCOGT Siding Springs early observations
  39. Konus-Wind observation of GRB 150818A
  40. GRB 150821A: LCOGT Sutherland observations
  41. GRB 150821A, Swift-BAT refined analysis
  42. GRB 150821A: Swift-XRT refined Analysis
  43. GRB 150821A: Fermi GBM detection
  44. GRB 150821A: VLT/X-shooter redshift
  45. Swift Trigger 652824: Is most likely a noise fluctuation in the direction of M31
  46. GRB 120729A: KAIT Optical Observations
  47. KAIT Optical Upper Limits for GRB 120422A, 120724A, 120803B, 120911A, and 120923A
  48. GRB150819A: NOT imaging
  49. Konus-Wind observation of GRB 150819B
  50. GRB 150819B: Fermi GBM detection
  51. IPN Triangulation of GRB 150819B (short / very intense)
  52. GRB 150818A: MITSuME Ishigakijima upper limits
  53. GRB 150818A: MITSuME Akeno optical upper limits
  54. GRB 150819A: Swift-BAT refined analysis
  55. GRB 150819A: MASTER-IAC early upper limit
  56. GRB 150818A: Swift-XRT update, correction to GCN 18162
  57. GRB 150819A: Swift detection of a burst
  58. GRB 150818A: Swift-XRT refined Analysis
  59. GRB 150817A: LCOGT observations
  60. GRB 150818A: Swift-BAT refined analysis
  61. GRB 150817A: P60 Observations
  62. GRB 150818A: Swift detection of a burst
  63. MASTER OT inside bright ESO240-010 galaxy detection during FERMI trigger GRB150816.83 inspection
  64. GRB 150817A: Fermi GBM observation
  65. GRB 150817A: Swift-BAT refined analysis
  66. GRB 150817A: Continued RATIR Observations, Revised Candidate
  67. GRB 150817A: Swift detection of a burst
  68. Konus-Wind observation of GRB 150811B
  69. Swift Trigger 652046 is probably not a GRB
  70. GRB 150811A: KAIT Refined Analysis
  71. IPN Triangulation of GRB 150811B
  72. GRB 150811B: Fermi GBM detection
  73. GRB 150811A: Swift-BAT refined analysis
  74. GRB 150810A: Fermi GBM detection
  75. GRB 150811A: LCOGT-McDonald afterglow detection
  76. GRB 150811A: KAIT optical candidate
  77. GRB 150811A: RATIR Optical Afterglow Detection
  78. GRB 150811A: Swift detection of a burst
  79. Fermi GBM GRB Trigger 460608875: iPTF P48 Observations
  80. GRB 150728A: TNG optical observations
  81. GRB 150801A: Swift-XRT observations
  82. GRB 150801B: Swift-BAT refined analysis
  83. GRB 150801B: Swift-XRT refined Analysis
  84. Fermi GBM GRB Trigger 458852670: iPTF P48 Observations
  85. GRB 150721A (Fermi GBM Trigger 459150552): iPTF P48 Observations
  86. GRB 150424A: HST imaging
  87. GRB 150728A: Swift-BAT refined analysis
  88. GRB 150728A: FTN observations
  89. GRB 150728A: Swift detection of a GRB
  90. GRB 150727A: Swift-BAT refined analysis
  91. GRB 150727A: LCOGT-Cerro Tololo observations
  92. GRB 150727A: Fermi GBM detection
  93. GRB 150724B: MASTER upper limit
  94. Konus-Wind observation of GRB 150724B
  95. Konus-Wind observation of GRB 150725A
  96. GRB 150724B: Swift-XRT observations
  97. IGR J00291+5934, Swift-BAT refined analysis
  98. GRB 150724B: Fermi GBM detection
  99. GRB 150724B: Fermi-LAT detection
  100. Swift Trigger 650221 / IGR J00291+5934: MASTER-IAC OT observations

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