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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"

2401 results found.

  1. GRB 260818B: EP-FXT follow-up observation
  2. GRB 260818A: J-band observations with WINTER
  3. GRB 260818B: SVOM/ECLAIRs refined analysis
  4. GRB 260818A: SVOM/ECLAIRs refined analysis
  5. GRB 260818B: NOT optical upper limits
  6. GRB 260810A: SVOM/GRM observation
  7. GRB 260818B: SVOM/COLIBRÍ (FM-GFT) optical upper limit
  8. GRB260818A: EP-FXT follow-up observation
  9. GRB 260818B: LCO optical upper limits
  10. GRB 260818B: SVOM detection of a short burst
  11. SVOM trigger sb26081806 is not a GRB
  12. EP260806a: SAO RAS multicolor optical observations
  13. GRB 260818A: LCO optical upper limits
  14. EP260812a: AbAO optical upper limit
  15. GRB 260818A: SVOM/COLIBRÍ (FM-GFT) optical upper limit
  16. GRB 260810A: Insight-HXMT/HE detection
  17. GRB 260818A: SVOM possible detection of a long and faint GRB
  18. EP260806a: SVOM/ECLAIRs detection through targeted search
  19. EP260806a: NUTTELA-TAO optical observations
  20. The EP-WXT trigger 01709281429 is likely a flaring star
  21. EP260812a: AZT-22 optical upper limit
  22. EP260812b: GTC/OSIRIS+ tentative spectroscopic redshift z = 2.034
  23. EP260806a: WFST optical observations
  24. The EP-WXT trigger 01709280562 is likely a flaring star
  25. EP260812b: Optical upper limit with Kinder
  26. The EP-WXT trigger 01709279838 is likely a flaring star
  27. GRB 260805D: SVOM/GRM detection of a possible magnetar burst
  28. GRB 260808B: Liverpool Telescope further optical observations
  29. GRB 260808B: GTC/OSIRIS+ spectroscopic redshift z = 1.295
  30. GRB 260813A: BALROG localization (Fermi Trigger 808341387 / GRB 260813803)
  31. GRB 260813A: Fermi GBM Final Real-time Localization
  32. EP260812a: NOT and Liverpool Telescope upper limits:
  33. EP260812b: Liverpool Telescope observations
  34. EP260812b: GOTO detection of the optical counterpart
  35. EP260812a: refined analysis of the EP-WXT and autonomous EP-FXT observation
  36. EP260812a: SVOM/C-GFT optical upper limit
  37. EP260812b: COLIBRÍ optical observations
  38. EP260812b: SVOM/VT optical observation
  39. GRB 260808A: SVOM/GRM observation
  40. EP260812b: Einstein Probe detection of an X-ray transient
  41. EP trigger #01709278129 (EP260812b?): NOT optical counterpart
  42. Fermi GBM Sub-Threshold Detection of GRB 260809A
  43. GRB 260810A: Glowbug gamma-ray detection
  44. GRB 260808B: SVOM/COLIBRÍ (FM-GFT) confirmation of the optical rebrightening
  45. GRB 260810A: AstroSat CZTI detection of a long burst
  46. EP260812a: Einstein Probe detection of an X-ray transient
  47. GRB 260809A: SAO RAS optical observations
  48. GRB 260808B: SAO RAS optical observations
  49. GRB 260808B: SVOM/VT optical re-brightening at day 3
  50. GRB 260317A: SVOM/ECLAIRs detection through offline targeted search and its possible association to magnetar 1E 1841-04.5
  51. GRB 260806A: CALET Gamma-Ray Burst Monitor detection
  52. GRB 260808A: GECAM-B observation
  53. EP260806a: MAO/AZT-22 optical observations
  54. IceCube-260807A: Upper limits from a search for additional neutrino events in IceCube
  55. GRB260808B: MAO/AZT-22 optical observations
  56. GRB 260809A: J-band upper limit with WINTER
  57. EP260809a: VLT/X-shooter spectroscopic redshift z = 3.07
  58. GRB 260806A: Glowbug gamma-ray detection
  59. GRB 260808A: CALET Gamma-Ray Burst Monitor detection
  60. GRB 260805C: CALET Gamma-Ray Burst Monitor detection
  61. GRB 260804A: CALET Gamma-Ray Burst Monitor detection
  62. GRB260809A/EPF_J234751.2+210212: EP-FXT follow-up observation
  63. The EP-WXT trigger 01709278015 is likely a flaring star
  64. GRB 260809A: SVOM/COLIBRÍ (FM-GFT) optical observation
  65. GRB 260808B: SVOM/COLIBRÍ (FM-GFT) optical observation
  66. GRB 260809A: NOT optical observations
  67. GRB260809A: MAO/AZT-22 optical observations
  68. IceCube-260805A: Upper limits from a search for additional neutrino events in IceCube
  69. GRB 260809A: SVOM/VT optical counterpart
  70. EP260809a: J-band upper limit with WINTER
  71. GRB 260808B: J-band upper limit with WINTER
  72. GRB 260808B: SVOM/ECLAIRs refined analysis
  73. EP260809a:refined analysis of the EP-WXT and autonomous EP-FXT observation
  74. GRB 260809A: SVOM detection of a faint burst
  75. GRB 260808B: Liverpool Telescope optical observations
  76. GRB 260808B: NOT optical observations
  77. GRB 260808B: LCO optical observations
  78. GRB 260808A: NuSTAR detection of prompt emission
  79. EP260809a: COLIBRÍ optical observations
  80. EP260809a: LCO optical observation
  81. GRB 260808B / EPF_J230056.0+082842: EP-FXT follow-up observation
  82. EP260809a: Einstein Probe detection of an X-ray transient
  83. GRB 260808B: SVOM/VT optical afterglow confirmation
  84. GRB 260808C: Fermi GBM Final Real-time Localization
  85. GRB 260808B: SVOM/VT optical candidate from VHF data ( localization correction for GCN 45317 )
  86. GRB 260808B: SVOM/VT optical candidate from VHF data
  87. GRB 260808B: SVOM detection of a faint burst
  88. GRB 260808A: BALROG localization (Fermi Trigger 807850307 / GRB 260808119)
  89. Fermi GRB 260808A: Global MASTER-Net observations report
  90. GRB 260808A: Fermi GBM Final Real-time Localization
  91. IceCube Alert 260807A: Global MASTER-Net observations report
  92. IceCube-260805A: One candidate from the Zwicky Transient Facility
  93. GRB 260807A: SVOM/COLIBRÍ (FM-GFT) optical upper limit
  94. GRB 260807A: SVOM possible detection of a faint burst
  95. EP260806a: COLIBRÍ optical observations
  96. EP260806a: refined analysis of the EP-WXT and autonomous EP-FXT observations
  97. EP260806a: SVOM/VT optical observation
  98. EP260806a: Liverpool Telescope observations of the counterpart show a blue colour
  99. EP260806a: OSIRIS+/GTC redshift z=0.089
  100. EP260731a: refined analysis of the EP-WXT and autonomous EP-FXT observations

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