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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"

3323 results found.

  1. EP241217a : Leavitt Observatory optical upper limit
  2. EP241217a: 1.6m Mephisto multi-band optical observations
  3. GRB 241209B: EP-FXT afterglow detection
  4. Konus-Wind detection of GRB 241204A (short/hard)
  5. EP 241217a: NIR detection with P200/WIRC
  6. EP 241217a: Possible J-band detection with WINTER
  7. GRB 241217A/EP241217B: Fermi-GBM Sub-Threshold Detection
  8. EP241217a: refined EP-WXT analysis and EP-FXT follow-up observations
  9. GRB 241217A: refined SVOM/MXT data analysis. Long lasting X-ray emission.
  10. GRB 241217A/EP241217b: REM optical/NIR upper limits
  11. EP241217a: REM optical/NIR upper limits
  12. EP241217a: NOT optical observations
  13. EP241217a: GROWTH-India Telescope optical observations
  14. EP241119a: 7DT Optical upper limits
  15. EP241217b: Global MASTER-Net observations report
  16. EP241217a: Xinglong optical follow-up observations
  17. EP241217b/GRB 241217A: EP detection of the prompt X-ray emssion
  18. EP241217a: Global MASTER-Net observations report
  19. EP241217a: Swift-XRT Detection
  20. EP241217A: Non-detection from Fermi-GBM Observations
  21. EP241217a: Kinder optical follow-up observations
  22. GRB 241213A (EP241213a): GRBAlpha detection
  23. EP241217A: LCO optical observations
  24. EP241217a: Gemini-North detection of the likely optical counterpart
  25. EP241217a: EP detection of an X-ray transient
  26. The EP-WXT trigger 01709129023 is likely a flaring star
  27. Konus-Wind detection of GRB 241213A (EP 241213a)
  28. The EP-WXT trigger 01709128948 is likely a flaring star
  29. The EP-WXT trigger 01709128921 is likely a flaring star
  30. EP trigger ID 01709128824 is not a real source
  31. EP241208a: NOT optical upper limits
  32. EP 241208A : Detection of a long soft transient by SVOM/ECLAIRs
  33. EP241213a/GRB241213a: Likely joint detection and INTEGRAL/SPI-ACS counterpart
  34. EP241213a: EP detection of An X-ray Transient
  35. Konus-Wind detection of GRB 241209B
  36. Konus-Wind detection of GRB 241209D
  37. EP241208a: Optical upper limit with Kinder observations
  38. GRB 241209A: EP-FXT follow-up observations
  39. EP241208a: Global MASTER-Net observations report
  40. EP241208a: EP-FXT follow-up observations
  41. EP241206a: 1.5m OSN optical limit
  42. EP241208a: EP detection of a fast X-ray transient
  43. AT2024adec: X-ray Upper Limits from EP-FXT Observation
  44. AT2024adec: X-ray Upper Limits from EP-FXT Observation
  45. EP241206a: BOOTES Global Network optical limits
  46. EP241206a: Global MASTER-Net observations report
  47. EP241206a: EP detection of a fast X-ray transient
  48. EP241201a: 1.6m Mephisto Optical Upper Limits
  49. EP241202b: Upper limits from Fermi-GBM Observations
  50. EP241202b: Kinder optical counterpart candidate
  51. EP241201a: EP-FXT follow-up observations
  52. Konus-Wind detection of GRB 241130A
  53. EP241202b: Global MASTER-Net observations report
  54. EP241201a: BOOTES-5 optical upper limit
  55. EP241202b: EP detection of a fast X-ray transient
  56. EP241201a: NOT optical observations
  57. EP241201a: Kinder optical counterpart candidate
  58. EP241201a: Global MASTER-Net observations report
  59. EP241201a: EP detection of a fast X-ray transient
  60. The EP-WXT trigger 01709126243 is not a real source
  61. EP241126a: 1.6m Mephisto Optical Upper Limits
  62. Konus-Wind detection of GRB 241114B
  63. LIGO/Virgo/KAGRA S241125n: GRANDMA Optical Upper Limits
  64. EP241126a: NOT optical observations
  65. EP241126a: SVOM/VT observations
  66. The EP-WXT trigger 01709125191 is not a real source
  67. EP241126a: WFST Observations
  68. LIGO/Virgo/KAGRA S241125n: EP-FXT follow-up observations (duplicate submission of 38345)
  69. LIGO/Virgo/KAGRA S241125n: EP-FXT follow-up observations (duplicate submission of 38345).
  70. LIGO/Virgo/KAGRA S241125n: EP-FXT follow-up observations
  71. EP241126a: Optical Upper limits with Kinder observations
  72. EP trigger ID 01709122294: 1.6m Mephisto multi-band optical observations
  73. EP241126a: EP-FXT follow-up observation update
  74. EP241126a: GSP detects optical counterpart
  75. EP241126a: TRT optical counterpart detection
  76. EP241126a: EP detection of a fast X-ray transient
  77. GRB 241113B: EP-FXT afterglow detection
  78. Konus-Wind detection of GRB 241115D / EP 241115a
  79. LIGO/Virgo/KAGRA S241125n: Upper limits from Konus-Wind observations
  80. EP241125a: Optical upper limit with Kinder observations
  81. EP241125a: EP detection of an X-ray transient
  82. LIGO/Virgo/KAGRA S241125n: No counterpart candidates in INTEGRAL SPI-ACS prompt observation, comparisong with Swift/BAT counterpart
  83. GRB 241113B: SVOM/VT optical afterglow observations
  84. Konus-Wind detection of GRB 241117A
  85. GRB 241025A: VIRT Optical Upper Limit
  86. Konus-Wind detection of GRB 241120A
  87. EP trigger ID 01709065118: Keck/LRIS spectroscopic observations
  88. EP-WXT trigger 01709018832: Lick/Kast spectroscopy with the 3 m Shane telescope
  89. EP241119a: Optical upper limits with Kinder observations
  90. EP trigger ID 01709122294: the X-ray transient is likely a stellar flare event
  91. EP241119a: GIT optical upper limits
  92. EP241119a : J-band observations with WINTER
  93. EP241119a: Global MASTER-Net observations report
  94. EP241119a: EP detection of a fast X-ray transient
  95. EP241115a/GRB 241115D: Optical upper limits with Kinder observations
  96. GRB 241113B: Mephisto upper limits
  97. EP241115a/GRB 241115D: Swift/XRT follow-up observation
  98. GRB 241115D / EP 241115a: SVOM/GRM observation
  99. The EP-WXT trigger 01709120856 is likely a flaring star
  100. EP241115a: Global MASTER-Net observations report

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