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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"

23561 results found.

  1. GRB 110808A: Swift/UVOT Detection
  2. GRB 110808A: VLT/X-shooter spectroscopy
  3. GRB 110808A: Enhanced Swift-XRT position
  4. GRB 110808A: Swift detection of a burst with optical counterpart
  5. Fermi GBM detection of a SGR-like burst
  6. GRB 110807A: SAO RAS observations
  7. GRB 110807A: Swift detection of a burst or a posible new SGR
  8. GRB 110726A: two epochs of SAO RAS optical observations
  9. IPN triangulation of GRB110802A (short/hard burst)
  10. GRB 110801A: optical observations in CrAO
  11. EVLA observation for Fermi burst GRB 110721A
  12. GRB 110801A: SAO RAS optical observations
  13. GRB110801A: MITSuME Ishigakijima Optical Observation at 1 day after the burst
  14. GRB 110801A: MASTER OT observations
  15. Swift/UVOT observations of GRB110801A
  16. GRB 110801A: Afterglow redshift from 10.4m GTC
  17. GRB110801A: MITSuME Ishigakijima Optical Observation
  18. GRB 110801A: Enhanced Swift-XRT position
  19. GRB 110801A: Swift detection of a burst with an optical counterpart
  20. GRB 110731A / EVLA upper limits
  21. GRB110731A: MITSuME Ishigakijima Optical Upper Limits
  22. GRB110731A: Swift/UVOT Observations
  23. GRB 110731A: NOT photometry
  24. GRB 110731A: Enhanced Swift-XRT position
  25. GRB 110731A: Swift detection of a burst with an optical counterpart
  26. Sw J1644+57 (GRB 110328A): Continued VLBA Observations
  27. INTEGRAL Weak trigger #6331: GRT Optical Observation
  28. GRB 110721A: Swift observations of afterglow candidate
  29. GRB 110726A: optical upper limit in CrAO
  30. Swift detection of a SGR-like burst from the AXP 4U 0142+61
  31. GRB 110726A: EVLA observations
  32. GRB110726A: MITSuME Ishigakijima Optical Observation
  33. GRB 110726A: Further Swift/UVOT Observations
  34. GRB110726A: Gemini-N tentative redshift
  35. GRB 110726A: Enhanced Swift-XRT position
  36. GRB 110726A: Swift/UVOT Detection
  37. GRB 110726A: Swift detection of a burst
  38. IPN triangulation of GRB 110721A
  39. GRB 110721A: Preliminary Swift/UVOT Upper Limits
  40. GRB 110721A: potential counterpart candidate
  41. GRB 110719A / SMA 345 GHz upper limits
  42. GRB 110721A: Fermi GBM detection
  43. GRB 110719A: GRT Optical Observation
  44. GRB 110719A: optical limit by "Pi of the Sky"
  45. GRB 110719A: z-band upper limit
  46. Swift/UVOT observations of GRB110719A
  47. Swift J1822.3-1606 : Fermi GBM observation
  48. GRB 110719A: optical upper limit
  49. GRB 110719A: Enhanced Swift-XRT position
  50. GRB 110719A: Swift detection of a burst
  51. GRB 110715A: ATCA detection of the radio counterpart
  52. Swift J1822.3-1606: Transient Magnetar or Be X-ray Binary?
  53. GRB110715A: GROND Detection of the Optical/NIR Afterglow
  54. GRB 110715A: APEX detection of the submm counterpart
  55. GRB 110715A: Swift/UVOT Detection
  56. GRB 110715A: Enhanced Swift-XRT position
  57. Swift J1822.3-1606: A Probable New SGR in Ground Analysis of BAT Data
  58. GRB 110715A: Swift detection of a bright burst with an optical counterpart
  59. GRB 110709B: Swift/UVOT Observations
  60. GRB 110709A / EVLA upper limits
  61. Swift trigger 457076 is not a GRB
  62. GRB 110709B: Submm observations from APEX
  63. IPN triangulation of GRB 110708B (long duration, extremely intense)
  64. Swift Trigger 457076: a possible GRB
  65. GRB 110709A: Swift/UVOT Upper Limits
  66. GRB 110709A: Konkoly observations
  67. GRB 110708A: Konkoly observations
  68. GRB 110709B BAT refined analysis
  69. GRB 110709B: Swift-XRT refined Analysis
  70. GRB 110709B: Swift/UVOT Detection of Possible Optical Flaring
  71. GRB110709A: MITSuME Ishigakijima Optical upper limits
  72. GRB 110709B: Enhanced Swift-XRT position
  73. GRB 110709B: GROND Detection of an Afterglow Candidate
  74. GRB 110709B: Gemini-South optical observations
  75. GRB 110709A : Xinglong TNT upper limit
  76. GRB 110709B: Swift detection of renewed activity at T+11 minutes.
  77. GRB 110709A: Enhanced Swift-XRT position
  78. GRB 110709B: Swift detection of a burst
  79. GRB 110708A: Swift/UVOT Observations
  80. GRB 110709A: MASTER-NET optical observations
  81. GRB 110709A: Swift detection of a burst
  82. GRB 110708A: Swift/XRT afterglow candidate for the INTEGRAL burst
  83. IPN triangulation of short hard GRB 110705A
  84. Swift trigger 456780 is not a burst
  85. GRB 110705A: Fermi GBM detection
  86. Swift Trigger 456659 is probably not astrophysical
  87. Swift-BAT trigger 456532 is not astrophysical
  88. SGR 1E 1841-045: early optical limit by "Pi of the Sky"
  89. SGR 1E 1841-045: Swift detection of a soft gamma repeater burst
  90. Swift J185003.2-005627: 1.23m CAHA and BOOTES-3 observations
  91. GRB 110625A: Fermi GBM and LAT observations
  92. GRB 110625A: Swift/UVOT Upper Limits
  93. GRB 110625A: 1.23m CAHA I-band observations
  94. GRB 110625A: Fermi LAT detection
  95. GRB 110625A: GROND detection of a source inside the XRT error circle
  96. GRB 110625A: Konkoly observations
  97. GRB 110625A: Swift-XRT refined Analysis
  98. Swift J185003.2-005627: NIR Observation
  99. GRB 110625A: ROTSE-III Optical Limits
  100. GRB 110625A: Swift detection of a burst

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