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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"

28275 results found.

  1. GRB 240822A: AstroSat CZTI detection of a short burst
  2. GRB 240821A: REM optical/NIR upper limits
  3. GRB 240821A: LCO optical observations
  4. GRB 240821A: JinShan optical upper limits
  5. GRB 240809A: Mondy and AbAO Optical Observations
  6. GRB 240821A: GMG Optical Upper Limit
  7. Fermi GRB 240821A: Global MASTER-Net observations report
  8. GECAM-B observation of a short burst from SGR 1E 1841-045 / Kes 73
  9. GRB 240821A: Fermi GBM Observation
  10. Fermi trigger No 745925274: Global MASTER-Net observations report
  11. Fermi trigger No 745935375: Global MASTER-Net observations report
  12. GRB240821A: EIRSAT-1 GMOD Detection
  13. GRB240821B: First GRB Detected by EIRSAT-1 GMOD
  14. GRB 240821A: SVOM/GRM observation
  15. GRB 240821A: SVOM/GRM observation
  16. GRB 240821A: GRANDMA/LesMakes-T60 Upper Limit
  17. Fermi trigger No 745866488: Global MASTER-Net observations report
  18. GRB 240821A: BALROG localization (Fermi Trigger 745958167 / GRB 240821775)
  19. GRB 240821A : a likely short GRB detected by SVOM/ECLAIRs
  20. GRB 240819A: Swift-XRT observations
  21. GRB 240819A: JinShan optical upper limits on one Swift/XRT source
  22. EP240820a: TRT optical upper limit
  23. EP240820a: EP detection of a fast X-ray transient
  24. EP240816a: PRIME upper limits
  25. Fermi trigger No 745873283: Global MASTER-Net observations report
  26. GRB 240819A : an X-ray transient detected by SVOM/ECLAIRs
  27. GRB 240819A: TRT optical upper limits on the Swift/XRT and EP/FXT sources
  28. EP240816b: Liverpool Telescope optical follow-up observations
  29. GRB 240805B: Osservatorio Astronomico Nastro Verde upper limit
  30. EP240816a: EP detection of a fast X-ray transient and follow-up observation
  31. EP240816b: TRT optical upper limit
  32. EP240816b: EP-WXT detection and EP-FXT follow-up observation of a fast X-ray transient
  33. EP240802a: Kinder optical, SWIFT-UVOT, and SWIFT-XRT upper limits 6 days after the WXT detection
  34. LIGO/Virgo/KAGRA S240813d: Updated Sky localization
  35. LIGO/Virgo/KAGRA S240813d: Identification of a GW compact binary merger candidate
  36. LIGO/Virgo/KAGRA S240813c: Updated Sky localization
  37. LIGO/Virgo/KAGRA S240813c: Identification of a GW compact binary merger candidate
  38. GRB 240810A: SVOM/GRM observation
  39. GRB 240809A : RAPAS follow-up observations
  40. GRB 240811A: Swift-BAT refined analysis
  41. GRB 240809A: Swift-BAT refined analysis
  42. EP240807a: PRIME H-band upper limits
  43. IceCube-240808A: Upper limits from a search for additional neutrino events in IceCube
  44. GRB 240811A: Bassano Bresciano Observatory upper limit
  45. GRB 240811A: Swift-XRT refined Analysis
  46. GRB 240811A: Swift/UVOT Upper Limits
  47. EP240801a: Assy-Turgen optical observations
  48. Fermi GRB 240810A: Global MASTER-Net observations report
  49. GRB 240811A: LCOGT Optical Upper Limit
  50. GRB 240811A: Enhanced Swift-XRT position
  51. GRB 240811A: Upper limits with Mephisto
  52. GRB 240811A: Swift detection of a burst
  53. GRB 240809A: REM detection of the optical afterglow
  54. GRB 240809A: Bassano Bresciano Observatory optical observations
  55. Fermi-LAT gamma-ray observations of IceCube-240808A
  56. GRB 240809A: GIT afterglow observations
  57. GRB 240809B: MAXI/GSC detection
  58. GRB 240809A: Swift/UVOT Detection
  59. GRB 240809A: Swift-XRT refined Analysis
  60. IPN triangulation of GRB 240807A / EP 240807a
  61. LIGO/Virgo/KAGRA S240807h: Updated Sky localization and EM Bright Classification
  62. X-ray Transient EP240807a: PRIME near-infrared upper limits
  63. GRB 240809A: JinShan optical observations
  64. GRB 240809A: Enhanced Swift-XRT position
  65. GRB 240809A: Skynet & Photon Ranch Optical Afterglow Observations
  66. GRB 240809A: Swift detection of a burst with a bright optical counterpart
  67. EP-WXT trigger 01709018832: SVOM/C-GFT observations of the star flare
  68. EP EP240806a: Global MASTER-Net observations report
  69. GRB 240710B: VZLUSAT-2 detection
  70. S240807h: Identification of a GW compact binary merger candidate
  71. GRB 240720B: VZLUSAT-2 detection
  72. GRB 240710A: VZLUSAT-2 detection
  73. EP240806A: Liverpool Telescope optical follow-up observations
  74. The EP-WXT trigger 01709018832 on August 7th is likely a flaring star
  75. EP240807a: EP-WXT detection of a fast X-ray transient
  76. EP240806a: Gemini North-GMOS spectroscopic redshift of z = 2.818
  77. GRB 240805B: GIT optical upper limit
  78. GRB 240805B: Swift-BAT refined analysis
  79. GRB 240805A: Swift-BAT refined analysis
  80. EP240806a: LCOGT optical counterpart detection
  81. GRB 240805B Bassano Bresciano Observatory upper limit
  82. GRB240805A: Fermi GBM Observation
  83. GRB 240805B: AbAO, CrAO, and Terskol optical upper limits
  84. EP240806a: EP-FXT detection of the X-ray emission
  85. GRB 240626B: VZLUSAT-2 detection
  86. GRB 240624B: VZLUSAT-2 detection
  87. GRB 240619C: VZLUSAT-2 detection
  88. EP 240806A: LCO optical observations
  89. EP240806a: EP-WXT detection of a fast X-ray transient
  90. GRB 240805B: Optical detection with 1.6m Mephisto
  91. GRB 240805B: NUTTelA-TAO / BSTI Optical Limits
  92. GRB 240805B: Swift-XRT refined Analysis
  93. GRB 240805B: Swift/UVOT Upper Limits
  94. GRB 240805A: Swift/UVOT Upper Limits
  95. GRB 240805B: BTA optical afterglow candidate
  96. GRB 240805B: Enhanced Swift-XRT position
  97. GRB 240805B: LCOGT Optical Upper Limits
  98. GRB 240805B: JinShan optical upper limits
  99. EP240801a: BTA BVRI photometry
  100. GRB 240805A: Swift-XRT refined Analysis

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