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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').

453 results found.

  1. Swift Trigger 558828 is not an interesting event
  2. GRB 130612A: Swift detection of a burst with an optical counterpart
  3. Konus-Wind observation of GRB 130610B
  4. Swift Trigger 557674 was due to an onboard position error
  5. GRB 130606A: Swift-XRT refined Analysis
  6. GRB130603B: Swift/UVOT detection
  7. GRB 130603B: Swift detection of a bright short burst
  8. IPN Triangulation of GRB 130320B (very long/bright)
  9. GRB 130327B: Fermi GBM detection
  10. GRB 121217A: Swift/UVOT Detection
  11. GRB 121217A: GROND Detection of the Afterglow
  12. GRB 121202A: Fermi GBM observation
  13. GRB 121201A: a GRB with an optical counterpart
  14. GRB 120811C: optical observations
  15. GRB 120811C: optical observations
  16. GRB 120811C: Swift/UVOT Detection
  17. GRB 120811C: RTT150 optical observations
  18. GRB 120811C: MASTER-Amur observations of fading OT
  19. GRB 120811C: Swift detection of a burst with an optical counterpart
  20. Swift Trigger 530581: GRB 120811A or a galactic transient
  21. GRB 120707A: Fermi GBM Detection of a Bright Burst
  22. Swift detection of 4U 1630-47
  23. GRB 120328A: Swift-XRT refined Analysis
  24. GRB 120311B: Swift-BAT refined analysis
  25. GRB 120119A: Swift/UVOT Observations
  26. AXP 4U 1042+61: Mondy optical observations
  27. AXP 4U 0142+61: Swift-BAT refined analysis (trigger 511611)
  28. Swift detection of an SGR burst from AXP 4U 0142+61
  29. Konus-Wind observation of GRB 111228A
  30. GRB 111123A: Swift/UVOT Upper Limits
  31. GRB 111003A: Fermi GBM detection
  32. GRB 110915A: Konus-Wind and Swift/BAT joint spectral analysis
  33. IPN triangulation of GRB 110918A (long duration, extremely intense)
  34. AXP 4U 0142+61: Fermi GBM detection
  35. AXP 4U 0142+61: Swift-BAT refined analysis
  36. Swift detection of a SGR-like burst from the AXP 4U 0142+61
  37. GRB 110709B: GROND Detection of an Afterglow Candidate
  38. GRB 110610A: Swift-XRT refined Analysis
  39. GRB 110426A: MASTER synchronous with MAXI/GSC observations
  40. GRB 110328A: Swift detection of a burst
  41. Konus-Wind observation of GRB 101123A
  42. GRB 101024A: Swift XRT refined analysis
  43. Konus-Wind observation of GRB 101017A
  44. GRB 100917A: Swift-BAT refined analysis
  45. GRB 100915B: GRT Optical Observation
  46. Konus-Wind observation of GRB 100906A
  47. GRB 100802A: Fermi GBM observation
  48. Konus-Wind observation of GRB 100414B
  49. Konus-Wind observation of GRB 100322A
  50. GRB 091221 Swift-BAT refined analysis
  51. GRB 091202: GTC & CAHA optical/nIR afterglow candidate
  52. GRB 091202 - UVOT-enhanced XRT position
  53. Konus-Wind observations of GRB 091010
  54. GRB 090812: Skynet/PROMPT and GORT Observations
  55. Konus-Wind observations of GRB 090827
  56. VLA radio non-detection of GRB 090812
  57. GRB 090812, RIMOTS optical upper limits
  58. GRB 090709A : Quick look analysis of the Suzaku observation
  59. VLA radio observations of GRB 090709A
  60. GRB 090618: Swift-BAT refined analysis
  61. GRB 090328: Fermi GBM Spectral Analysis
  62. GRB 090109: Fermi GBM detection
  63. IPN Triangulation and Energy Spectrum of GRB080916C
  64. GRB 080905B: Watcher optical detection
  65. GRB 080906: Refined Swift/UVOT Observations
  66. GRB 080905B: Refined UVOT Analysis
  67. GRB 080905B: VLT redshift
  68. GRB 080805: Swift-XRT Refined Analysis
  69. GRB 080603A: CrAO optical observations
  70. GRB 080625: Suzaku WAM observation of the prompt emission
  71. GRB 0800603A: optical observation
  72. GRB 080603A: optical observations on June 04
  73. GRB 080603A: optical observations
  74. GRB 080603A: Xinglong R band observation
  75. GRB 080603A: TLS Afterglow Observation
  76. GRB 080603A: Swift-XRT detection of the afterglow
  77. GRB 080603A: Swift/UVOT detection of the afterglow
  78. GRB 080603B: TAROT Calern observatory detection of a plateau in the light curve
  79. GRB080603: Super-LOTIS detection of Optical Counterpart
  80. GRB 080603 OA candidate
  81. Possible GRB080603: Faulkes Telescope North optical afterglow candidate
  82. Konus-Wind observation of GRB 080513
  83. Konus-Wind observation of GRB 080211
  84. GRB 080205: Swift/UVOT observations
  85. GRB 080205: KAIT OA detection
  86. GRB 080129: Gemini-South photometry
  87. Swift detection of MXB 0656-072
  88. Swift UVOT upper limits of GRB071112B
  89. GRB 071112B: Swift-XRT preliminary analysis
  90. GRB0711101: Two new source from Xinglong TNT observation
  91. GRB 071101: a nearby galaxy
  92. GRB 070810B: Swift detection of a short burst
  93. Swift trigger on 4U 1700-377 while star tracker loss-of-lock
  94. Konus-Wind observation of GRB 070626
  95. GRB 070517: Gemini optical imaging
  96. GRB 070508, Swift-BAT refined analysis
  97. GRB 070508: Swift detection of an intense burst with an optical counterpart
  98. GRB 070420: Swift detection of a burst with optical afterglow
  99. GRB 070330: Swift detection of a burst
  100. IPN localization of very intense short GRB 070201

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