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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"

1023 results found.

  1. GRB 261008A: SVOM/GRM observation
  2. GRB 261011A: SVOM/C-GFT optical observations
  3. GRB 261011A: LCO optical observations
  4. GRB 261011A: SVOM/VT optical observation from VHF data
  5. GRB 261011A: SVOM detection of a long bright burst
  6. GRB 261001A: SVOM/GRM observation
  7. EP261010a: SVOM/VT optical upper limits
  8. EP261007b: SVOM/ECLAIRs Upper Limit
  9. GRB 261007A: SVOM/ECLAIRs refined analysis
  10. EP261007b: SVOM/VT optical detection of the NOT transient
  11. GRB 261007A / EP261007a: SVOM/GWAC-F60A/B observations
  12. GRB 261007A: SVOM/GRM observation
  13. EP261007b: SVOM/C-GFT optical upper limits
  14. GRB 261007A / EP261007a: SVOM/VT optical observations
  15. EP261007b: SVOM/VT optical upper limits
  16. GRB 261007A: SVOM/COLIBRÍ (FM-GFT) optical observations
  17. GRB 261007A: SVOM/C-GFT optical observations
  18. GRB 261007A / EP261007a: LCO optical observations
  19. EP261006a: SVOM/VT optical upper limits
  20. GRB 261007A: SVOM detection of a burst
  21. EP trigger 01709320985: SVOM/C-GFT optical upper limits
  22. GRB 260930B: SVOM/GRM observation
  23. GRB 260926C: SVOM/GRM observation
  24. EP260927a: SVOM/ECLAIRs Upper Limit
  25. GRB 260924A: SVOM/GRM observation
  26. GRB 260921A: SVOM/GRM observation
  27. GRB 260920A: SVOM/GRM observation
  28. GRB 260918A: SVOM/ECLAIRs refined analysis
  29. GRB 260922A: SVOM/C-GFT optical upper limit
  30. GRB 260917B:: SVOM/ECLAIRs refined analysis
  31. EP260920b: SVOM/VT optical observation
  32. EP260920a: SVOM/VT optical upper limits
  33. EP260917a: SVOM/VT optical upper limits
  34. GRB 260918A: SVOM/C-GFT optical upper limits
  35. GRB 260918A: SVOM/VT optical upper limits
  36. GRB 260918A: LCO optical upper limits
  37. GRB 260918A: SVOM/COLIBRÍ (FM-GFT) optical upper limits
  38. GRB 260918A: SVOM detection of a burst
  39. GRB 260915A: SVOM/ECLAIRs refined analysis
  40. GRB 260917B: SVOM/VT optical observations
  41. GRB 260917B: LCO optical observation
  42. GRB 260917B: SVOM/COLIBRÍ (FM-GFT) optical counterpart candidate
  43. GRB 260917B: SVOM detection of a faint burst
  44. GRB 260914A: SVOM/GRM observation
  45. GRB 260914A: SVOM/ECLAIRs refined analysis
  46. GRB 260915A: SVOM/C-GFT optical upper limits
  47. GRB 260915A: SVOM/VT refined early optical upper limits
  48. GRB 260915A: SVOM/VT optical upper limits
  49. GRB 260915A: SVOM/COLIBRÍ (FM-GFT) optical upper limit
  50. GRB 260915A: SVOM/VT optical upper limits from VHF data
  51. GRB 260915A: LCO optical upper limits
  52. GRB 260915A: SVOM detection of a burst
  53. GRB 260914A: LCO optical observation
  54. GRB 260914A: SVOM/C-GFT optical observations
  55. GRB 260914A: SVOM/VT optical counterpart confirmation
  56. GRB 260914A: SVOM/VT optical observation from VHF data
  57. GRB 260914A: SVOM/COLIBRÍ (FM-GFT) possible optical counterpart candidate
  58. GRB 260914A: SVOM detection of a burst
  59. GRB 260913A: SVOM trigger sb26091302 is not an astrophysical event
  60. GRB 260913A: SVOM/C-GFT optical upper limit
  61. GRB 260913A: SVOM detection of a faint burst
  62. GRB 260907A: SVOM/GRM observation
  63. GRB 260909A: SVOM/ECLAIRs refined analysis
  64. GRB 260909A: SVOM/VT optical upper limits
  65. GRB 260909A: SVOM/GRM observation
  66. GRB 260909A: SVOM/C-GFT optical upper limit
  67. GRB 260909A: SVOM detection of a burst
  68. GRB 260903A: SVOM/ECLAIRs refined analysis
  69. GRB 260903A: LCO optical observations
  70. GRB 260903A: SVOM/VT optical candidate
  71. GRB 260903A: Retraction of optical counterpart of GCN 45501
  72. GRB 260903A: LCO optical counterpart detection
  73. GRB 260903A: SVOM detection of a soft faint burst
  74. EP260901a: SVOM/VT optical upper limits
  75. GRB 260829A: SVOM/GRM observation
  76. GRB 260831B / sb26083106: SVOM/GWAC-F60A/B confirmation of optical variation of nova V* GK Per
  77. GRB 260831B / sb26083106: SVOM/VT optical variability of V* GK Per
  78. SVOM trigger sb26083106 is not a GRB
  79. GRB 260831B: LCO optical upper limits
  80. GRB 260827A: SVOM/GRM observation
  81. GRB 260831B: SVOM detection of a possible burst
  82. GRB 260825A: SVOM/GRM observation of a long burst
  83. GRB 260818B: SVOM/VT optical upper limit and continuous observations
  84. GRB 260818B: SVOM/COLIBRÍ (FM-GFT) optical counterpart candidate
  85. GRB 260807A: EP-FXT follow-up observations
  86. GRB 260822A: SVOM/ECLAIRs refined analysis
  87. GRB 260809A: SVOM/ECLAIRs refined analysis
  88. GRB 260822A: SVOM/VT optical upper limits
  89. GRB 260822A: EP/FXT follow-up observations
  90. GRB 260818A: further EP-FXT observations and X-ray afterglow confirmation
  91. GRB 260822A: SVOM/VT optical detection of COLIBRÍ candidate
  92. GRB 260822A: SVOM/COLIBRÍ (FM-GFT) possible optical counterpart candidate
  93. GRB 260822A: LCO optical upper limits
  94. GRB 260822A: SVOM detection of a short burst
  95. GRB 260818B: SVOM/C-GFT optical upper limit
  96. EP260731a: SVOM/ECLAIRs detection through offline targeted search
  97. GRB 260818B: SVOM/GRM observation
  98. GRB 260818B: SVOM/ECLAIRs refined analysis
  99. GRB 260818A: SVOM/ECLAIRs refined analysis
  100. GRB 260810A: SVOM/GRM observation

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