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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"

27245 results found.

  1. Swift GRB 241115A: Global MASTER-Net observations report
  2. Fermi GRB 241115A: Global MASTER-Net observations report
  3. GRB 241115A: Swift detection of a burst
  4. GRB 241115A: Fermi GBM Final Real-time Localization
  5. GRB 241113B: KAIT Optical Afterglow Candidate
  6. LIGO/Virgo/KAGRA S241114bi: Upper limits from Fermi-GBM Observations
  7. LIGO/Virgo/KAGRA S241114bi: Coverage and upper limits from MAXI/GSC observations
  8. GRB 241113A: Swift-BAT refined analysis
  9. Fermi GRB 241114A: Global MASTER-Net observations report
  10. EP241113a: Global MASTER-Net observations report
  11. GRB 241114A: Fermi GBM Final Real-time Localization
  12. GRB 241113B: J-band upper limit from WINTER
  13. GRB 241030A: LCO optical observation
  14. EP241113b: Global MASTER-Net observations report
  15. EP241113b/GRB 241113B: EP detection of GRB 241113B
  16. GRB 241113B: SVOM/GRM observation
  17. EP241113a: EP on-board trigger and autonomous follow-up observation
  18. GRB 241113A: Swift-XRT refined Analysis
  19. EP241107a: SOAR upper limits
  20. GRB 241113A: Swift/UVOT Detection
  21. GRB 241113A: REM detection of the optical/NIR afterglow
  22. Konus-Wind detection of GRB 241107A (short/hard)
  23. Fermi Gamma-ray Burst Monitor trigger 753166198/241113201 is not a GRB
  24. GRB 241113A: LCO optical observations
  25. GRB 241112B: GMG Optical Upper Limit
  26. GRB241113A: LCOGT (40-cm) optical counterpart detection
  27. GRB 241113B : detection of a long GRB by SVOM/ECLAIRs
  28. GRB 241113A: Swift detection of a burst with an optical counterpart
  29. Swift GRB241113.33: Global MASTER-Net observations report
  30. SVOM/GRM detection of a short burst from SGR 1E1841-045
  31. Fermi trigger No 753166198: Global MASTER-Net observations report
  32. GRB 241107A: GROWTH-India telescope optical upper limit
  33. IceCube Alert 241113.02: Global MASTER-Net observations report
  34. Fermi GRB 241112A: Global MASTER-Net observations report
  35. Fermi-GBM Sub-Threshold Detection of GRB 241112B
  36. GRB 241112B: Optical afterglow detection confirmation in revisiting the Mephisto data
  37. GRB 241112B: SVOM/GRM observation
  38. GRB 241112B: SVOM/VT afterglow detection
  39. Fermi Gamma-ray Burst Monitor trigger 752995908/241111230 (GRB 241111A) is not a GRB
  40. GRB 241107A: Swift/BAT candidate arcminute localization of a short burst
  41. GRB 241112B: Mephisto optical upper limits
  42. GRB 241112B: GOTO optical upper limits
  43. GRB 241112B : detection of a long GRB by SVOM/ECLAIRs
  44. GRB 241107A: INTEGRAL IBIS localization
  45. EP241107a: EP-FXT follow-up observations
  46. GRB 241112A: Fermi GBM Final Real-time Localization
  47. LIGO/Virgo/KAGRA S241109bn: ATLAS observations and discovery of the potential counterpart AT2024aawt
  48. IPN triangulation of GRB 241107A (short/hard)
  49. Fermi trigger No 752990530: Global MASTER-Net observations report
  50. GRB 241111A: Fermi GBM Final Real-time Localization
  51. GRB 241030B: TESS detection of optical counterpart
  52. LIGO/Virgo/KAGRA S241110bk: 1 counterpart neutrino candidate event from an IceCube neutrino search
  53. LIGO/Virgo/KAGRA S241109bn: Upper limits from EP-WXT observations
  54. Fermi trigger No 752878030: Global MASTER-Net observations report
  55. Integral GRB241109.89: Global MASTER-Net observations report
  56. LIGO/Virgo/KAGRA S241109bn: Coverage and upper limits from MAXI/GSC observations
  57. EP241109a: KAIT photometry and 3 m Shane spectroscopy from Lick observatory
  58. LIGO/Virgo/KAGRA S241109bn: Upper limits from Fermi-GBM Observations
  59. GRB 241108A: Further COLIBRÍ Upper Limits on the Optical Counterpart
  60. LIGO/Virgo/KAGRA S241109bn: Global MASTER-Net observations report
  61. EP241109a: confirmation of a stellar flare by BOOTES-7
  62. EP241109a: EP on-board trigger and autonomous follow-up observation
  63. EP241107a: KAIT optical observations
  64. GRB 241030A: TESS observations
  65. GRB 241108A: COLIBRÍ Upper Limits on the Optical Counterpart
  66. GRB 241108A : a likely weak long GRB detected by SVOM/ECLAIRs
  67. EP241107a: Kinder optical follow-up observations
  68. GRB 241104A: CALET Gamma-Ray Burst Monitor detection
  69. EP241107a: AKO Optical Afterglow Follow-Up Observations
  70. EP241107a: GSP detects optical counterpart
  71. EP241107a: Gemini-South spectroscopic confirmation (z = 0.456)
  72. GRB 241107A: SVOM/GRM detection of a short burst
  73. GRB 241105A: EP-FXT follow-up observations
  74. GRB 241105A: SVOM/GRM observation
  75. EP241107a: FTW Optical and NIR observations of the optical counterpart
  76. EP241107a: GIT optical observations
  77. EP241107a: Global MASTER-Net observations report
  78. EP241107a: SVOM/C-GFT optical observations
  79. EP241107a: AKO Optical Afterglow Detection
  80. GRB241105A: Gemini-South Optical Afterglow Detection
  81. EP241107a: EP on-board trigger and autonomous follow-up observation
  82. GRB 241105A: VLT/FORS2 optical afterglow rapid fading
  83. GRB 241105A: Swift/UVOT Detection
  84. GRB 241030A: optical afterglow detection from the INAF Asiago Observatory
  85. GRB 241105A: BOOTES-7 optical detection
  86. GRB 241105A: Fermi GBM Observation of a Short Burst with Extended Emission
  87. LIGO/Virgo/KAGRA S241106ba: 1 counterpart neutrino candidate event from an IceCube neutrino search
  88. LIGO/Virgo/KAGRA S241102o: 1 counterpart neutrino candidate event from an IceCube neutrino search
  89. GRB 241105A: SVOM/VT optical afterglow observations
  90. GRB 241105A: VLT/FORS2 spectroscopic redshift z = 2.681
  91. GRB 240511A: LCO upper limits
  92. GRB 241104A: Fermi GBM Observation
  93. GRB 241104A: The SVOM/VT candidate in GCN circular 38086 is not an astrophysical source
  94. GRB 241105A: Swift/BAT-GUANO arcminute localization of a short burst
  95. GRB 241104A: NOT optical non-detection
  96. GRB 241105A: GOTO tentative optical counterpart candidate
  97. Fermi GRB 241105A: Global MASTER-Net observations report
  98. GRB 241104A: SVOM/VT optical candidate
  99. GRB 241105A: Fermi GBM Final Real-time Localization
  100. GRB 241104A/EP241104a: Optical upper limits with Kinder observations

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