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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"

12390 results found.

  1. GRB 241217A / EP241217b: Nanshan/HMT optical upper limit
  2. GRB 241217A / EP241217b: NOT optical upper limits
  3. GRB 241218A: REM optical upper limit
  4. GRB 241217A/EP241217b: REM optical/NIR upper limits
  5. EP241217a: REM optical/NIR upper limits
  6. GRB 241218A: NUTTelA-TAO / BSTI Optical Limits
  7. EP241119a: 7DT Optical upper limits
  8. EP241217b: Global MASTER-Net observations report
  9. GRB 241209A: ATCA radio follow-up observations
  10. EP241217a: Xinglong optical follow-up observations
  11. GRB 241218A: LCOGT Optical Upper Limit
  12. EP241217a: Global MASTER-Net observations report
  13. GRB 241217A: GMG Optical Upper Limit
  14. GRB 241218A: Swift detection of a burst
  15. GRB 241217A: Swift-XRT afterglow detection
  16. GRB 241217A: LCO optical upper limit
  17. GRB 241217A: GRANDMA/TAROT optical upperlimits
  18. Konus-Wind detection of GRB 241213A (EP 241213a)
  19. GRB 241215A: Mondy AZT-33IK optical observations
  20. GRB 241212A: Swift-XRT observations
  21. GRB 241215A: Nanshan/HMT optical upper limit
  22. GRB 241215A: Montarrenti Observatory optical upper limit
  23. GRB 241215A: GROWTH-India telescope optical upper limit
  24. Integral GRB241215.58: Global MASTER-Net observations report
  25. GRB 241213B: Swift-XRT observations
  26. GRB 241213A: SVOM/VT optical candidate
  27. GRB 241213A: Swift/UVOT Upper Limits
  28. EP241208a: NOT optical upper limits
  29. GRB 241213A: LCOGT Optical Upper Limits
  30. GRB 241213B: MAXI/GSC detection
  31. GRB 241213A: REM optical/NIR upper limits
  32. GRB241212A: OHP/T193 optical observations
  33. GRB 241213A: SAO RAS optical upper limit
  34. Swift GRB 241213A: Global MASTER-Net observations report
  35. GRB 241212A : SVOM/C-GFT optical upper limit at early phase
  36. GRB 241209B: GRANDMA/TRT upper limit
  37. GRB 241207A: TSHAO Zeiss-1000 optical observations
  38. GRB 241209B: Mondy AZT-33IK and AbAO AS-32 optical observations
  39. GRB 241209D: REM optical/NIR upper limits
  40. EP241208a: Optical upper limit with Kinder observations
  41. GRB 241209A: EP-FXT follow-up observations
  42. EP241208a: Global MASTER-Net observations report
  43. Fermi trigger No 755485387: Global MASTER-Net observations report
  44. GRB 241209A: BOOTES-7 and 2.2m CAHA early optical upper limits
  45. GRB 241209A: COLIBRÍ Optical Upper Limit
  46. Fermi GRB 241209D: Global MASTER-Net observations report
  47. GRB 241209A: GRANDMA/TAROT upper limit
  48. GRB 241209B: BOOTES-5 optical upper limit
  49. Swift GRB 241209D: Global MASTER-Net observations report
  50. Fermi GRB 241209C: Global MASTER-Net observations report
  51. Fermi GRB 241209E: Global MASTER-Net observations report
  52. GRB 241209A: REM optical/NIR observations
  53. Fermi GRB 241209A: Global MASTER-Net observations report
  54. GRB 241209A: GOTO optical upper limits
  55. EP241206a: 1.5m OSN optical limit
  56. GRB 241209A: Swift detection of a short burst
  57. Swift GRB241209.23: Global MASTER-Net observations report
  58. Fermi GRB 241207B: Global MASTER-Net observations report
  59. GRB 241206A: DDOTI Upper Limit on the Afterglow
  60. AT2024adec: X-ray Upper Limits from EP-FXT Observation
  61. AT2024adec: X-ray Upper Limits from EP-FXT Observation
  62. GRB 241207C: MASTER optical observations
  63. Fermi trigger No 755225799: Global MASTER-Net observations report
  64. GRB 241207C: MAXI/GSC detection
  65. Fermi trigger No 755277791: Global MASTER-Net observations report
  66. Fermi GRB 241207A: Global MASTER-Net observations report
  67. EP241206a: Global MASTER-Net observations report
  68. GRB 241206B: GWAC-F50A optical upper limit
  69. Fermi GRB 241206A: Global MASTER-Net observations report
  70. EP241201a: 1.6m Mephisto Optical Upper Limits
  71. GRB 241204A: COLIBRÍ Optical Upper Limit
  72. EP241202b: KAIT optical upper limit
  73. LIGO/Virgo/KAGRA S241125n: gamma-ray upper limits from joint observations by the LST-1 and MAGIC telescopes
  74. GRB 241204A: DDOTI Upper Limits on the Afterglow
  75. Fermi GRB 241204A: Global MASTER-Net observations report
  76. GRB 241128A : RAPAS follow-up observations
  77. EP241202b: Upper limits from Fermi-GBM Observations
  78. EP241202b: Kinder optical counterpart candidate
  79. Konus-Wind detection of GRB 241130A
  80. EP241202b: Global MASTER-Net observations report
  81. EP241201a: BOOTES-5 optical upper limit
  82. EP241201a: NOT optical observations
  83. GRB 241128A: Swift/UVOT Upper Limits
  84. IceCube-241127A: Upper limits from a search for additional neutrino events in IceCube
  85. EP241201a: Global MASTER-Net observations report
  86. Fermi GRB 241201A: Global MASTER-Net observations report
  87. EP241126a: 1.6m Mephisto Optical Upper Limits
  88. Fermi trigger No 754701230: Global MASTER-Net observations report
  89. LIGO/Virgo/KAGRA S241125n: GRANDMA Optical Upper Limits
  90. GRB 241128A: AbAO optical upper limit
  91. Swift GRB 241128A: Global MASTER-Net observations report
  92. Fermi-LAT gamma-ray observations of IceCube-241127A
  93. Fermi trigger No 754492985: Global MASTER-Net observations report
  94. Swift GRB241127.91: Global MASTER-Net OT detection
  95. IceCube Alert 241127.59: Global MASTER-Net observations report
  96. Swift GRB241127.91: Global MASTER-Net observations report
  97. Swift GRB241127.91: Global MASTER-Net OT detection
  98. LIGO/Virgo/KAGRA S241125n: Preliminary flux estimate and spectral analysis of the Swift/BAT-GUANO candidate counterpart
  99. LIGO/Virgo/KAGRA S241125n: Swift-UVOT Upper Limits
  100. EP241126a: Optical Upper limits with Kinder observations

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