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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.

Advanced Search Examples (click to copy):

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

2853 results found.

  1. GRB 140930B: MASTER early optical observations
  2. GRB 140930B: Swift detection of a short burst
  3. Konus-Wind observation of GRB 140928A
  4. GRB 140916A: Swift detection of a burst
  5. GRB 140907A : Optical observations from Nanshan
  6. GRB 140907A: Swift detection of a burst with an optical counterpart
  7. GRB 140903A: MAXI/GSC upper limit
  8. IPN Triangulation of GRB 140825A (very intense/long)
  9. GRB140819A: Deep GROND Upper Limits
  10. Fermi trigg_num 430148973: OSN I-band observations
  11. Swift trigger 609139 is probably 4U 1850-03
  12. GRB 140808A: Swift/UVOT Upper Limits
  13. Trigger 607399: Swift detection of SGR1806-20
  14. GRB 140719B, Swift-BAT refined analysis
  15. Swift detection of UX Ari
  16. GRB 140706A: Swift detection of a burst with an optical counterpart
  17. GRB 140629A: T100 observations
  18. GRB 140628A: Swift/UVOT Detection
  19. GRB 140628A: Swift/UVOT Detection
  20. GRB 140628A: Swift-XRT afterglow detection and enhanced position
  21. Fermi 424934131 / iPTF14cva: Discovery and Redshift of Optical Afterglow
  22. GRB 140619B: Fermi GBM detection of a short GRB
  23. Fermi 423717114: Additional P48 and P60 observations
  24. GRB 140512A: MASTER prompt and afterglow optical observations
  25. GRB 140518A: KAIT optical candidate
  26. GRB 140515B: MAXI/GSC detection
  27. GRB 140512A: MASTER OT decay and early light curve
  28. GRB 140430A: iTelescope.Net T16 Optical Observation
  29. GRB 140423A: MITSuME Akeno upper limits
  30. GRB 140423A: MITSuME Akeno Optical observation
  31. GRB 140423A, Optical Observations
  32. Konus-Wind observation of GRB 140413A
  33. GRB 140406A: Fermi GBM observation
  34. IPN triangulation of GRB 130330A
  35. GRB 140331A: Swift detection of a burst
  36. GRB 140320B: Swift-XRT detection of the afterglow
  37. GRB 140320B: ISON-NM optical observations
  38. GRB 140320B: FTN optical afterglow candidate
  39. GRB 140320A: Fermi GBM observations suggest a short GRB
  40. GRO J1744-28: Fermi GBM observation
  41. GRB 140304A: Swift-XRT refined Analysis
  42. GRB 140219A: the confirmation of the brightening SDSS J102406.41+062937.6 star
  43. GRB 140215A: WSRT radio observation
  44. Trigger 586482: Swift detection of GROJ1744-28
  45. GRB 140103A: MASTER-Net early OT detection
  46. GRB 140103A: optical upper limit
  47. GRB 140110A: Swift XRT observations
  48. GRB 140108A: MASTER-Net OT detection
  49. GRB 140108A: Swift detection of a burst
  50. GRB 131231A: Swift/UVOT Observations of the Optical Afterglow
  51. GRB 131231A: P60 observations
  52. GRB 131231A: Swift-XRT observations
  53. GRB 131231A: MDM afterglow observation
  54. GRB 131231A: afterglow confirmation from the NOT
  55. GRB 131231A: Nanshan afterglow candidate
  56. GRB 131127B: MASTER-Net optical observations
  57. GRB 131127A: AROMA-N Optical Observation
  58. GRB 131117A: VLT/X-shooter redshift
  59. IPN triangulation of GRB 131108A
  60. LOAO B,R Observation of GRB131030A
  61. Swift Trigger 575905: ROTSE-III Optical Limits
  62. Swift Trigger 575905: KAIT Optical Upper Limit
  63. IPN Triangulation of GRB 131014A
  64. GRB 131004A: Swift detection of a burst (may be short)
  65. GRB 130925A/Sw J0244-2609: mm observations at PdBI
  66. GRB 131002B, Swift-BAT refined analysis
  67. GRB 131002B: Swift/UVOT Upper Limits
  68. GRB 131002B: Enhanced Swift-XRT position
  69. GRB 131002B: Swift detection of a burst
  70. Observation of possible GRB/TDE 130925A by INTEGRAL/SPI-ACS: three activity episodes
  71. GRB 130925A: VLT/X-shooter redshift
  72. GRB 130831A: RTT150 optical observations
  73. GRB 130907A: MASTER refined analysis
  74. GRB 130907A: Skynet DSO-14/Yerkes-41 detections of a possible afterglow
  75. GRB 130907A: MASTER early OT observations
  76. GRB 130907A: Swift detection of a burst with an optical counterpart
  77. GRB 130831A : Xinglong 60cm optical observation
  78. IPN triangulation of GRB 130828A
  79. GRB 130812A: Swift detection of a burst
  80. GRB 130623A: GROND detection of the optical/NIR afterglow
  81. GRB 130702A : Xinglong TNT continue optical observation
  82. GRB 130627B, Swift-BAT refined analysis
  83. GRB 130627B: Possible Swift-XRT afterglow detection
  84. GRB 130623A: Fermi GBM detection
  85. GRB 130625A: Swift detection of a burst
  86. GRB 130623A detected in ground analysis of Swift-BAT data
  87. GRB 130612A: Swift detection of a burst with an optical counterpart
  88. GRB 130608A: ISON-Kislovodsk optical upper limit
  89. GRB 130605A: Swift detection of a burst
  90. GRB 130603B: AMI-LA 15GHz observations
  91. GRB 130603A: SON optical observations
  92. GRB 130603B: Swift detection of a bright short burst
  93. GRB 130528A: Swift detection of a burst
  94. GRB 130514A: Konus-Wind and Swift/BAT joint spectral analysis
  95. GRB 130511A, Swift-BAT refined analysis
  96. GRB 130511A: Enhanced Swift-XRT position
  97. GRB 130511A: Swift detection of a burst with an optical counterpart
  98. GRB 130508A, Swift-BAT refined analysis
  99. GRB 130505B: Swift Candidate Afterglow
  100. GRB 130504A: Bassano Bresciano Observatory optical upper limit

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