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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"

12344 results found.

  1. GRB 250103A: SVOM/C-GFT optical upper limit
  2. GRB 250101A: NUTTelA-TAO / BSTI Optical Limits
  3. IceCube Alert 250102.58: Global MASTER-Net observations report
  4. EP241231b: optical upper limit with the Liverpool Telescope
  5. EP250101a: Xinglong optical upper limit
  6. LIGO/Virgo/KAGRA S241230bd: Upper limits from Swift/BAT-GUANO
  7. GRB 250101A: Swift/UVOT Detection
  8. Fermi GRB 250101B: Global MASTER-Net observations report
  9. LIGO/Virgo/KAGRA S250101k: Upper limits from Fermi-GBM Observations
  10. Swift GRB250101.56: Global MASTER-Net observations report
  11. LIGO/Virgo/KAGRA S241231du: Coverage and upper limit from MAXI/GSC observations
  12. EP241217A: J band upper limit by SYSU 80cm telescope
  13. GRB 241229B: SAO RAS optical upper limit
  14. IceCube-Cascade 241228A: Upper limits from a search for additional neutrino events in IceCube
  15. GRB 241229B: SVOM/VT optical candidate
  16. GRB 241229A: Swift-XRT observations
  17. Konus-Wind detection of GRB 241228A
  18. EP240702a: 7DT Optical upper limits
  19. GRB 240606B: 7DT Optical upper limits
  20. Fermi trigger No 757231333: Global MASTER-Net observations report
  21. GRB241229B: UVOT upper limits
  22. GRB 241229B: NUTTelA-TAO / BSTI Optical Limits
  23. Swift GRB 241229B: Global MASTER-Net observations report
  24. GRB 241229A: GOTO optical upper limits
  25. GRB 241228A: NOT optical upper limits
  26. Fermi GRB 241228B: Global MASTER-Net observations report
  27. Swift GRB 241228A: Global MASTER-Net observations report
  28. GRB 241228A: GROWTH-India telescope optical upper limit
  29. GRB 241228A: Swift/UVOT Upper Limits
  30. GRB 241228A: Swift detection of a burst
  31. IceCube-241224A: Upper limits from a search for additional neutrino events in IceCube
  32. GRB 241217A/EP241217b: continued SOAR observations
  33. Fermi GRB 241226A: Global MASTER-Net observations report
  34. EP241223a: Mondy AZT-33IK optical observations
  35. GRB 241223A: Swift-XRT observations
  36. Fermi trigger No 756678579: Global MASTER-Net observations report
  37. IceCube Alert 241224.30: Global MASTER-Net observations report
  38. EP241223a: Global MASTER-Net observations report
  39. EP241113a: Non-detection in Radio Follow-up Observations with eMERLIN
  40. GRB241113A: 7DT Optical upper limits
  41. Fermi GRB 241223A: Global MASTER-Net observations report
  42. GRB 241217A / EP241217b: Non-detection in ATCA Radio Follow-up Observations
  43. Fermi trigger No 756447119: Global MASTER-Net observations report
  44. Fermi GRB 241221A: Global MASTER-Net observations report
  45. EP241217a: Liverpool Telescope optical upper limit
  46. GRB 241218A: Mondy AZT-33IK optical upper limit
  47. EP241217a : Leavitt Observatory optical upper limit
  48. EP241217a: 1.6m Mephisto multi-band optical observations
  49. GRB 241217a/EP241217B: 1.6m Mephisto optical upper limits
  50. GRB 241218A: Swift/UVOT Upper Limits
  51. EP241217a: optical upper limit with the Liverpool Telescope
  52. Konus-Wind detection of GRB 241204A (short/hard)
  53. GRB 241218A: NOT optical upper limits
  54. GRB 241217A / EP241217B: GRANDMA/T1MPicduMidi optical upperlimits
  55. GRB 241217A / EP241217b: Nanshan/HMT optical upper limit
  56. GRB 241217A / EP241217b: NOT optical upper limits
  57. GRB 241218A: REM optical upper limit
  58. GRB 241217A/EP241217b: REM optical/NIR upper limits
  59. EP241217a: REM optical/NIR upper limits
  60. GRB 241218A: NUTTelA-TAO / BSTI Optical Limits
  61. EP241119a: 7DT Optical upper limits
  62. EP241217b: Global MASTER-Net observations report
  63. GRB 241209A: ATCA radio follow-up observations
  64. EP241217a: Xinglong optical follow-up observations
  65. GRB 241218A: LCOGT Optical Upper Limit
  66. EP241217a: Global MASTER-Net observations report
  67. GRB 241217A: GMG Optical Upper Limit
  68. GRB 241218A: Swift detection of a burst
  69. GRB 241217A: Swift-XRT afterglow detection
  70. GRB 241217A: LCO optical upper limit
  71. GRB 241217A: GRANDMA/TAROT optical upperlimits
  72. Konus-Wind detection of GRB 241213A (EP 241213a)
  73. GRB 241215A: Mondy AZT-33IK optical observations
  74. GRB 241212A: Swift-XRT observations
  75. GRB 241215A: Nanshan/HMT optical upper limit
  76. GRB 241215A: Montarrenti Observatory optical upper limit
  77. GRB 241215A: GROWTH-India telescope optical upper limit
  78. Integral GRB241215.58: Global MASTER-Net observations report
  79. GRB 241213B: Swift-XRT observations
  80. GRB 241213A: SVOM/VT optical candidate
  81. GRB 241213A: Swift/UVOT Upper Limits
  82. EP241208a: NOT optical upper limits
  83. GRB 241213A: LCOGT Optical Upper Limits
  84. GRB 241213B: MAXI/GSC detection
  85. GRB 241213A: REM optical/NIR upper limits
  86. GRB241212A: OHP/T193 optical observations
  87. GRB 241213A: SAO RAS optical upper limit
  88. Swift GRB 241213A: Global MASTER-Net observations report
  89. GRB 241212A : SVOM/C-GFT optical upper limit at early phase
  90. GRB 241209B: GRANDMA/TRT upper limit
  91. GRB 241207A: TSHAO Zeiss-1000 optical observations
  92. GRB 241209B: Mondy AZT-33IK and AbAO AS-32 optical observations
  93. GRB 241209D: REM optical/NIR upper limits
  94. EP241208a: Optical upper limit with Kinder observations
  95. GRB 241209A: EP-FXT follow-up observations
  96. EP241208a: Global MASTER-Net observations report
  97. Fermi trigger No 755485387: Global MASTER-Net observations report
  98. GRB 241209A: BOOTES-7 and 2.2m CAHA early optical upper limits
  99. GRB 241209A: COLIBRÍ Optical Upper Limit
  100. Fermi GRB 241209D: Global MASTER-Net observations report

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